CN107020951A

CN107020951A - Transfer gear

Info

Publication number: CN107020951A
Application number: CN201610862532.5A
Authority: CN
Inventors: 今福瑞树
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2015-09-29
Filing date: 2016-09-28
Publication date: 2017-08-08
Anticipated expiration: 2036-09-28
Also published as: CN107020951B; JP6372535B2; JP2017065669A

Abstract

The present invention provides a kind of transfer gear that can shorten the distance between output shaft and the second axle compared with prior art so that transfer gear is minimized.When being driven in rotation nut part (92) by motor (84), nut part (92) can be moved on the first axle C1 directions of rear wheel-side output shaft (44), and the linear motion of nut part (92) can be passed to front-wheel drive clutch (50) via the first transmission mechanism (88a).Therefore, because the linear motion of the nut part (92) of thread mechanism (86) that is arranged on rear wheel-side output shaft (44) via the first transmission mechanism (88a) is passed to front-wheel drive clutch (50), therefore ball cam need not be set to implement the regulation of the transmission torque of clutch with leading screw as prior art, so as to suitably shorten the distance between rear wheel-side output shaft (44) and fork shaft (102).

Description

Transfer gear

Technical field

Make the technology that transfer gear is minimized compared with existing, described point in following transfer gear the present invention relates to a kind of High low speed switching mechanism and the power by output shaft that dynamic device possesses the rotation speed change of input shaft and transmitted to output shaft A part transmitted to output block or the clutch that blocks or the transmission torque transmitted to output block is adjusted.

Background technology

For example, as it is known that there is following transfer gear, it possesses：Input shaft；Output shaft；High low speed switching mechanism, it will be described defeated Enter the rotation speed change of axle and transmitted to the output shaft；Output block, it is described defeated that it is different from the output target of power Shaft；Clutch, a part for the power of the output shaft is transmitted or blocked to the output block by it, or to described The transmission torque of output block transmission is adjusted.Described transfer gear is this transfer gear in patent document 1.In patent In document 1 in the transfer gear of described four-wheel drive vehicle, the high low speed is implemented by a motor (actuator) The switch operating of switching mechanism and the regulation of the transmission torque of the clutch.In the transfer gear of above-mentioned patent document 1, as By the switching mechanism for being converted to linear motion of the motor, using drum cam come for the high low speed switching mechanism Switch operating, using ball cam and leading screw come the regulation of the transmission torque for the clutch.

Citation

Patent document

Patent document 1：No. 2007/0251345 specification of U.S. Patent Application Publication No.

The content of the invention

Invent problem to be solved

But, although in the transfer gear of above-mentioned patent document 1, make by using motor parallel with the output shaft Second axle rotation driving of configuration and the drum cam and the leading screw is worked, but in order to obtain pre- in the clutch Fixed transmission torque, it is necessary to by the length for the leading screw being arranged between the output shaft and second axle be set to predetermined value with On, therefore the distance between the output shaft and second axle can become long, so that transfer gear can become larger.

The present invention using as above the fact completed as background, its object is to there is provided a kind of with existing transfer gear phase Than the distance between output shaft and the second axle can be set to shorter so that the transfer gear of transfer gear miniaturization.

Method for solving problem

First invention is characterized by, and is possessed：(a) input shaft；Output shaft；High low speed switching mechanism, it is by the input The rotation speed change of axle is simultaneously transmitted to the output shaft；Output block, it makes the output target of power be different from the output Axle；Clutch, a part for the power of the output shaft is transmitted or blocked to the output block by it, or to described defeated The transmission torque for going out part transmission is adjusted, and the transfer gear is characterised by possessing：(b) actuator；(c) thread mechanism, It makes the thread spindle part mutually screwed up and the screwed part of any one party in nut part by using the actuator Rotation driving is carried out around the axle center of the output shaft, so that the nut part is on the axis direction of the output shaft Move；(d) the first transmission mechanism, it is by the linear motion of the nut part in the thread mechanism to the clutch Device is transmitted；(e) cam engaging part, it, which is attached at, abreast configures with the output shaft and with can be in axis direction On the mode that moves and on the second axle being supported by and a side of the screwed part of one；(f) drum cam, its On the opposing party for being attached at second axle and the screwed part of one, and it is formed with and the cam holding section The cam path of part engaging, and the axle center for the output shaft for passing through the screwed part around one carries out rotation so as to relative Relatively moved in the cam engaging part on the axis direction of second axle；(g) the second transmission mechanism, it has There is second axle, by the shifting on the axis direction of second axle in the cam engaging part or the drum cam It is dynamic to be transmitted via second axle to the high low speed switching mechanism, and the high low speed switching mechanism is switched to High-speed side gear stage and low speed side gear stage.

In addition, the second invention is characterized by, (a) possesses inclination in the cam path for being formed at the drum cam Cam groove portion and switching cam groove portion, the tilting cam groove portion is to the axle center relative to the output shaft or second axle Axle center and inclined direction extends, the switching cam groove portion is to the axle center relative to the output shaft or second axle Axle center and the extension of orthogonal direction, and for the transmission torque transmitted to the output block to be adjusted, (b) passes through institute Switching cam groove portion is stated, no matter how the screwed part of one is rotated around the axle center of the output shaft, is prevented The cam engaging part and the relative movement of the drum cam on the axis direction of second axle.

In addition, the 3rd invention is characterized by, possess on the end of a side of the tilting cam groove portion as described Switch the first switching cam groove portion of cam groove portion, possess on the end of the opposing party of the tilting cam groove portion as described Switch the second switching cam groove portion of cam groove portion.

In addition, the 4th invention is characterized by, (a) possesses in the cam path being formed on the drum cam to incline Oblique cam groove portion, the tilting cam groove portion is tilted to the axle center relative to the output shaft or the axle center of second axle Direction extension, (b) is carried out around the axle center of the output shaft making the screwed part of one by the actuator During rotation, by the tilting cam groove portion, make the drum cam with the nut part in the axle center of the output shaft Amount of movement on direction compare and larger amount of movement and relative to the cam engaging part in the axle center side of second axle Relatively moved upwards.

In addition, the 5th invention is characterized by, (a) described cam engaging part is attached on second axle, (b) institute Drum cam is stated to be attached on the screwed part of one.

In addition, the 6th invention is characterized by, and in the case where the screwed part of one is the nut part, institute State nut part to be supported by the way of it can be rotated around the axle center of the output shaft, the thread spindle part is with can not The mode that moves and can not be rotated around the axle center of the output shaft on the axis direction of the output shaft is propped up Hold.

In addition, the 7th invention is characterized by, in the case where the screwed part of one is the thread spindle part, The nut part is supported by the way of it can not be rotated around the axle center of the output shaft, and the thread spindle part is not with The mode quilt that can be moved and can be rotated around the axle center of the output shaft on the axis direction of the output shaft Supporting.

In addition, the 8th invention is characterized by, to the drum cam side in the both ends of the output shaft The output shaft support bearing that end is supported in the way of it can rotate, in the axle center of the output shaft of the drum cam The inner side of the drum cam is configured in length range on direction.

In addition, the 9th invention is characterized by, (a) described actuator is attached at institute via worm-and-wheel gear State on the nut part of thread mechanism, (b) described cam engaging part is attached on the worm gear of the worm-and-wheel gear, (c) drum cam is attached on second axle, periphery of (d) the described drum cam along the worm gear and be formed For part-cylindrical shape.

In addition, the tenth invention is characterized by, second transmission mechanism possesses wait mechanism, the wait mechanism via Spring members and movement of the cam engaging part on the axis direction of second axle or the drum cam are existed Movement on the axis direction of second axle is transmitted to second axle.

In addition, the 11st invention is characterized by, the nut part via multiple balls with the thread spindle part Screw up.

In addition, the 12nd invention is characterized by, transmission torque of (a) the described clutch to being transmitted to the output block It is adjusted, (b) described clutch is veneer clutch or multi-plate clutch.

Invention effect

According to first invention, possess：Actuator；Thread mechanism, it makes mutually to twist by using the actuator The thread spindle part of conjunction is rotated with the screwed part of any one party in nut part around the axle center of the output shaft Driving, so that the nut part is moved on the axis direction of the output shaft；First transmission mechanism, it will be described The linear motion of the nut part in thread mechanism is transmitted to the clutch；Cam engaging part, it is concatenated The second axle for abreast configuring and being supported by the way of it can be moved on axis direction with the output shaft with And on a side of the screwed part of one；Drum cam, it is attached at second axle and the screw thread of one On the opposing party in part, and the cam path engaged with the cam engaging part is formed with, and by around one Screwed part the output shaft axle center carry out rotate so as to relative to the cam engaging part in second axle Axis direction on relatively moved；Second transmission mechanism, it has second axle, and by the cam engaging part or Movement on the axis direction of second axle in drum cam described in person is cut via second axle to the high low speed Converting mechanism is transmitted, and the high low speed switching mechanism is switched into high-speed side gear stage and low speed side gear stage.Therefore, When the screwed part for making one by the actuator surrounds the axle center rotation driving of the output shaft, the nut Part can be moved on the axis direction of the output shaft and the linear motion of the nut part can be via described One transmission mechanism and be passed to the clutch.In addition, work as encloses the screwed part of one by the actuator During around the axle center rotation driving of the output shaft, the drum cam can be relative to the cam engaging part in the second axle Relatively moved on axis direction, so that movement or the cydariform of the cam engaging part on second axle are convex Mobile on second axle of wheel can be passed to the high low speed switching mechanism via second transmission mechanism.By This, because the linear motion of the nut part of the thread mechanism being arranged on the output shaft is via described first Transmission mechanism and be passed to the clutch, therefore be used for example without setting ball cam and leading screw as prior art As described clutch transmission torque regulation, so as to suitably shorten between the output shaft and second axle away from From, and then transfer gear can be minimized.

In addition, according to second invention, possessing inclination in the cam path being formed on the drum cam convex Take turns groove portion and switching cam groove portion, the tilting cam groove portion is to the axle center relative to the output shaft or second axle Axle center and inclined direction extend, and the switching cam groove portion is to the axle center relative to the output shaft or second axle Axle center and the extension of orthogonal direction, and for the transmission torque transmitted to the output block to be adjusted, cut by described Cam groove portion is changed, no matter how the screwed part of one is rotated around the axle center of the output shaft, is prevented described Cam engaging part and the relative movement of the drum cam on the axis direction of second axle.Therefore, described In the state of cam engaging part engages with the tilting cam groove portion for the cam path being formed on the drum cam, When the screwed part for making one surrounds the axle center of the output shaft and rotation driving, the drum cam is relative to described Cam engaging part and relatively moved on the axis direction of second axle so that the tooth of the high low speed switching mechanism Wheel level is switched.Also, due to when the cam engaging part engages with the switching cam groove portion of the cam path, nothing How to be rotated by the screwed part of one around the axle center of the output shaft, prevent the cam engaging part and Relative movement of the drum cam on the axis direction of second axle, therefore, is maintaining the high low speed switching machine While the state of the gear stage of structure, the axis direction of the nut part to the output shaft is set to move so that described The linear motion of nut part is passed to the clutch via first transmission mechanism.Thereby, it is possible to maintain institute While the state for the gear stage for stating high low speed switching mechanism, the biography by the clutch to being transmitted to the output block Torque is passed to be adjusted.

In addition, according to the 3rd invention, possessing on the end of a side of the tilting cam groove portion and being cut as described The first switching cam groove portion of cam groove portion is changed, possesses on the end of the opposing party of the tilting cam groove portion and is cut as described Change the second switching cam groove portion of cam groove portion.Therefore, when the screwed part by making one is around the output shaft Axle center and rotate so that the cam engaging part with described first switching cam groove portion or it is described second switching cam path When portion engages, the high low speed switching mechanism can be switched to the high-speed side gear stage or the low speed side gear stage. Also, due to engaging in the cam engaging part with the described first switching cam groove portion or the second switching cam groove portion In the state of, though the screwed part of one around the output shaft axle center and rotated, but no matter one Screwed part how to be rotated around the axle center of the output shaft, prevent the cam engaging part and the cydariform Relative movement of the cam on the axis direction of second axle, therefore, it is possible to which the high low speed switching mechanism is being switched into institute While stating the state of high-speed side gear stage or the low speed side gear stage, by the clutch to the output section The transmission torque of part transmission is adjusted.

In addition, according to the 4th invention, possessing inclination in the cam path being formed on the drum cam convex Take turns groove portion, the tilting cam groove portion is to the axle center relative to the output shaft or the axle center of second axle and inclined side To extension, when the screwed part for making one by the actuator is rotated around the axle center of the output shaft, By the tilting cam groove portion, make the drum cam with the nut part on the axis direction of the output shaft Amount of movement compare and larger amount of movement and carried out relative to the cam engaging part on the axis direction of second axle Relative movement.Therefore, the high-speed side gear stage of the high low speed switching mechanism and the switching of the low speed side gear stage Response with for example by movement of the nut part on the axis direction of the output shaft in the thread mechanism come The high-speed side gear stage is significantly increased compared with the low speed side gear stage is switched over.

In addition, according to the 5th invention, the cam engaging part is attached on second axle, and the cydariform is convex Wheel is attached on the screwed part of one.Therefore, incited somebody to action to implement the switch operating of the high low speed switching mechanism The drum cam is attached on the screwed part of the one for the thread mechanism being arranged on the output shaft.By This, due to setting the drum cam without the drum cam is arranged on second axle, therefore without such as existing Put the transfer gear on second axle make like that the drum cam being arranged on second axle not be arranged on it is described High the low speed switching mechanism and the clutch on output shaft are interfered, so as to suitably shorten the output The distance between axle and second axle.

In addition, according to the 6th invention, it is described in the case where the screwed part of one is the nut part Nut part is supported by the way of it can be rotated around the axle center of the output shaft, and the thread spindle part is with can not be The mode that moves and can not be rotated around the axle center of the output shaft on the axis direction of the output shaft is supported by. In this way, it is described when being made by the actuator in the case where the screwed part of one is the nut part During nut part rotation driving, the nut part can be to moving on the axis direction of the output shaft, so that the nut portions The linear motion of part can be passed to the clutch via first transmission mechanism.Also, work as and pass through the actuator And when making the nut part rotation driving, the drum cam being attached on the nut part is rotated, and with The cam engaging part of the cam path engaging is moved on the axis direction of second axle, so that the cam The linear motion of engaging part is passed to the high low speed switching mechanism via second transmission mechanism.

In addition, according to the 7th invention, in the case where the screwed part of one is the thread spindle part, institute State nut part to be supported by the way of it can not be rotated around the axle center of the output shaft, the thread spindle part is with can not The mode that moves and can be rotated around the axle center of the output shaft on the axis direction of the output shaft is propped up Hold.In this way, in the case where the screwed part of one is the thread spindle part, make when by the actuator During the thread spindle part rotation driving, the nut part can be moved on the axis direction of the output shaft, so that The linear motion of the nut part can be passed to the clutch via first transmission mechanism.Also, work as and pass through The actuator and when making the thread spindle part rotation driving, be attached at the drum cam meeting on the thread spindle part Rotated, and the cam engaging part engaged with the cam path can be carried out on the axis direction of second axle The mobile linear motion so as to the cam engaging part is passed to the high low speed via second transmission mechanism and switched Mechanism.

In addition, according to the 8th invention, due to the end of the drum cam side in the both ends to the output shaft The output shaft support bearing that portion is supported in the way of it can rotate, in the axle center side of the output shaft of the drum cam The inner side of the drum cam is configured in upward length range, therefore, it is possible to suitably shorten described in the transfer gear The length of size on the axis direction of output shaft.

In addition, according to the 9th invention, the actuator is attached at the rib machine via worm-and-wheel gear On the nut part of structure, the cam engaging part is attached on the worm gear of the worm-and-wheel gear, the drum cam Be attached on second axle, periphery of the drum cam along the worm gear and be formed part-cylindrical shape.Cause This, is configured due to that can abut the drum cam and the worm gear, therefore, it is possible to suitably shorten the output shaft and institute State the distance between second axle.

In addition, according to the tenth invention, second transmission mechanism possesses wait mechanism, and the wait mechanism is via bullet Spring part and by movement of the cam engaging part on the axis direction of second axle or the drum cam in institute The movement stated on the axis direction of the second axle is transmitted to second axle.Therefore, in the institute of the high low speed switching mechanism When stating the switching of high-speed side gear stage and the low speed side gear stage, produced with the switching of the high low speed switching mechanism Impact can by it is described wait mechanism spring members and be absorbed.

In addition, according to the 11st invention, the nut part is twisted via multiple balls with the thread spindle part Close.Therefore, because rotating against between the nut part and the thread spindle part becomes smooth, therefore institute during work Stating the required electric power of actuator can stably decline.

According to the 12nd invention, the transmission torque transmitted to the output block is adjusted the clutch, The clutch is veneer clutch or multi-plate clutch.Therefore, it is possible to implement the clutch transmission torque it is continuous Variable control, implements to distribute control to the driving force of front-wheel, trailing wheel so as to further according to driving condition.

Brief description of the drawings

Fig. 1 is the figure illustrated to the Sketch for applying the vehicle of the present invention and is to for implementing in vehicle The figure that the major part of the control system of various controls is illustrated.

Fig. 2 is the sectional view illustrated to the Sketch of transfer gear, and to represent to be used for set in high-speed side gear stage For the figure of the mode of 4WD transport conditions.

Fig. 3 is the frame diagram illustrated to the Sketch of transfer gear.

Fig. 4 is the sectional view illustrated to the Sketch of transfer gear, and to represent to be used for set in low speed side gear stage For the figure of the mode of the 4WD transport conditions under 4WD lockup states.

Fig. 5 is the Fig. 2 illustrated to the drum cam being arranged on transfer gear enlarged drawing.

Sectional view when Fig. 6 observes for Fig. 5 VI-VI, Fig. 6 (a) is to represent quilt when fork shaft is high speed gear position The figure of the position for the cam engaging part being attached on fork shaft, Fig. 6 (c) is to represent being connected when fork shaft is low-speed gear position The figure of the position of cam engaging part of the knot on fork shaft, Fig. 6 (b) is to represent fork shaft from high speed gear position to low-speed gear The figure of the position of the cam engaging part being attached on fork shaft in the switching that position is switched over.

Fig. 7 is the sectional view illustrated to the Sketch of the transfer gear of other embodiments of the invention.

Fig. 8 regards sectional view for Fig. 7 VIII-VIII.

Fig. 9 is the enlarged drawing for being exaggerated a part for Fig. 7 transfer gear.

Figure 10 regards sectional view, being concatenated when Figure 10 (a) is represents that fork shaft is in high speed gear position for Fig. 9 X-X The figure of the position of drum cam on fork shaft, being attached at when Figure 10 (c) is represents that fork shaft is in low-speed gear position The figure of the position of drum cam on fork shaft, Figure 10 (b) is in the position from high speed gear position to low-speed gear for expression fork shaft Put switching in the drum cam being attached on fork shaft position figure.

Figure 11 is the figure that illustrates of Sketch of the transfer gear of other embodiments to the present invention, and for should The enlarged drawing that a part for transfer gear is exaggerated.

Figure 12 regards sectional view, and being attached at during to represent that fork shaft is in high speed gear position for Figure 11 XII-XII The figure of the position of drum cam on fork shaft.

Figure 13 regards sectional view, quilt when Figure 13 (a) is represents that fork shaft is in high speed gear position for Figure 11 XII-XII The figure of the position for the drum cam being attached on fork shaft, being connected when Figure 13 (c) is represents that fork shaft is in low-speed gear position The figure of the position of drum cam of the knot on fork shaft, Figure 13 (b) is in from high speed gear position to low speed tooth for expression fork shaft The figure of the position of the drum cam being attached on fork shaft in the switching of wheel position.

Figure 14 regards sectional view, and being attached at during to represent that fork shaft is in low-speed gear position for Figure 11 XII-XII The figure of the position of drum cam on fork shaft.

Figure 15 regards sectional view for Figure 11 XII-XII, and Figure 15 (a) and Figure 15 (c) is in low speed for expression fork shaft The figure of the position of the drum cam being attached on fork shaft during gear position, Figure 15 (b) is represents in drum cam from figure 15 (a) spring members for the wait mechanism that transfer gear possesses into the movement of Figure 15 (c) are compressed and the spring The force of part is applied in the figure of the state on drum cam.

Figure 16 regards sectional view, quilt when Figure 16 (a) is represents that fork shaft is in low-speed gear position for Figure 11 XII-XII The figure of the position for the drum cam being attached on fork shaft, being connected when Figure 16 (c) is represents that fork shaft is in high speed gear position The figure of the position of drum cam of the knot on fork shaft, Figure 16 (b) is in from low-speed gear position to high speed tooth for expression fork shaft The figure of the position of the drum cam being attached on fork shaft in the switching of wheel position.

Figure 17 regards sectional view for Figure 11 XII-XII, and Figure 17 (a) and Figure 17 (c) is at a high speed for expression fork shaft The figure of the position of drum cam during gear position, Figure 17 (b) is represents in drum cam from Figure 17 (a) to Figure 17's (c) spring members for the wait mechanism that transfer gear possesses are compressed in movement and the force of the spring members is applied in The figure of state on drum cam.

Figure 18 is the frame diagram illustrated to the Sketch of the transfer gear of other embodiments of the invention.

Embodiment

Hereinafter, come embodiments of the invention are described in detail referring to the drawings.In addition, below in an example, it is attached Figure is suitably simplified or changed, and size ratio and shape of each several part etc. may not be described exactly.

Embodiment 1

Fig. 1 is the figure that the Sketch for applying the vehicle 10 of the present invention is illustrated, and for for implementing The figure that the major part of the control system of the various controls of vehicle 10 is illustrated.In Fig. 1, vehicle 10 possesses：It is used as driving The engine 12 in power source, left and right front-wheel 14L, 14R (being referred to as front-wheel 14 in the case where not distinguished to it especially), left and right Trailing wheel 16L, 16R (in the case where not distinguished to it especially be referred to as trailing wheel 16), by the power of engine 12 respectively to Power transmission 18 that front-wheel 14 is transmitted with trailing wheel 16 etc..Trailing wheel 16 two wheel drives (2WD) traveling in and four-wheel It is the main drive wheel as driving wheel when in driving (4WD) traveling.Front-wheel 14 is when during 2WD is travelled for driven pulley and in 4WD To be used as the secondary driving wheel of driving wheel when in traveling.Vehicle 10 is four wheel drivings based on driving (FR) by front engine rear wheel Motor-car.

Power transmission 18 possesses：The speed changer (transmission) 20 that is attached on engine 12, it is concatenated The transfer gear 22 of the four-wheel drive vehicle as front and back wheel distributing means for power supply on speed changer 20, it is attached at respectively point Move the preceding truck drive shaft 24 on device 22 and truck drive shaft 26, the front-wheel being attached on preceding truck drive shaft 24 are poor afterwards Moving gear device 28, the trailing wheel differential gearing 30 being attached on rear truck drive shaft 26, to be attached at front-wheel poor Left and right front wheel axle 32L, 32R on moving gear device 28 (are referred to as front-wheel car in the case where not distinguished to it especially Axle 32), be attached at trailing wheel and (area especially do not carried out to it with left and right axletree of rear wheel 34L, 34R on differential gearing 30 It is referred to as axletree of rear wheel 34 in the case of other) etc..In the power transmission 18 being configured in this way, via speed changer 20 and to transfer gear 22 transmit engine 12 power from transfer gear 22, successively via rear truck drive shaft 26, trailing wheel use The power transfer path of the rear wheel-side of differential gearing 30, axletree of rear wheel 34 etc. and transmitted to trailing wheel 16.In addition, to trailing wheel 16 A part for the power of the engine 12 of side transmission is distributed by transfer gear 22 to the side of front-wheel 14, and is passed successively via preceding automobile The power transfer path of the front wheel side of moving axis 24, front-wheel differential gearing 28, front wheel axle 32 etc. and transmitted to front-wheel 14.

Front-wheel with differential gearing 28 front wheel axle 32R sides (i.e. front-wheel differential gearing 28 and front-wheel 14R it Between) possess front side clutch 36.Front side clutch 36 is, optionally to front-wheel with differential gearing 28 and front-wheel 14R it Between power transfer path be attached or cut off electricity (electromagnetism) control engaged clutch.In addition, in front side clutch In device 36, can also possess lazy-tongs (synchronous matching mechanism).

Fig. 2 to Fig. 4 is the figure illustrated to the Sketch of transfer gear 22, Fig. 2 and the section view that Fig. 4 is transfer gear 22 Figure, Fig. 3 is the frame diagram of transfer gear 22.In Fig. 2 into Fig. 4, transfer gear 22 possesses the transfer gear shell as on-rotatably moving part 40.Transfer gear 22 possesses around shared first axle (axle center) C1：Side by transfer gear shell 40 that can rotate The input shaft 42 that formula is supported by；The rear wheel-side output shaft (output shaft) of power is exported to the trailing wheel 16 as the first left and right sidesing driving wheel 44；Power is exported to as the front-wheel 14 of the second left and right sidesing driving wheel, i.e. the output target of power is different from rear wheel-side output shaft The drive gear (output block) 46 of 44 sprocket shape；As by the rotation speed change of input shaft 42 and to rear wheel-side output shaft The high low speed switching mechanism 48 of 44 auxiliary transmissions transmitted；To the biography transmitted from rear wheel-side output shaft 44 to drive gear 46 Torque is passed to be adjusted, i.e. using a part for the power of rear wheel-side output shaft 44 to drive gear 46 transmitted as many The front-wheel drive of plate friction clutch (multi-plate clutch) clutch (clutch) 50.Input shaft 42 and rear wheel-side output shaft 44 is each (defeated via a pair of first bearing supports 71 and the second bearing support in the way of it mutually can carry out Concentric rotation Go out shaft support bearing) 73 it is supported on transfer gear shell 40, drive gear 46 with rear wheel-side output shaft 44 can carry out phase The mode of rotation is supported by via the 3rd bearing support 75 with one heart.That is, input shaft 42, rear wheel-side output shaft 44, drive Moving gear 46 is supported on transfer gear shell 40 in the way of it can be rotated around first axle C1 respectively.In addition, rear Take turns in side output shaft 44, between the end by configuring the front side in the end of the rear side of input shaft 42 and rear wheel-side output shaft 44 Bearing 77 so that the end of the front side of rear wheel-side output shaft 44 is supported by the way of it can rotate, pass through second It is described hereinafter among holding bearing 73 and making end, the i.e. both ends of rear wheel-side output shaft 44 of the rear side of rear wheel-side output shaft 44 The end of the side of drum cam 100 be supported by the way of it can rotate.

As shown in Figures 2 to 4, transfer gear 22 in the transfer gear shell 40 around parallel with first axle C1 shared the Two axis C2 and possess：The driven gear of front wheel side output shaft 52, the sprocket shape being wholely set with front wheel side output shaft 52 54.Also, transfer gear 22 possesses：Be wound around front-wheel drive chain 56 between drive gear 46 and driven gear 54, as with The 4WD lockable mechanisms 58 for the dog clutch that rear wheel-side output shaft 44 and the one of drive gear 46 link.

Input shaft 42 is attached at via joint on the output shaft of speed changer 20 (not shown), and by from engine 12 Via speed changer 20 input driving force (torque) and be driven in rotation.Rear wheel-side output shaft 44 passes to be attached at rear automobile Main drive shaft on moving axis 26.Drive gear 46 is configured to be rotated against around rear wheel-side output shaft 44.Before Wheel side output shaft 52 is the secondary driving shaft on truck drive shaft 24 before being attached at via joint (not shown).

The transfer gear 22 constituted in this way passes through front-wheel drive transmission of polar driving gear 46 with clutch 50 Transmission torque is adjusted, and the power transmitted from speed changer 20 is only transmitted to trailing wheel 16, or is also divided to front-wheel 14 Match somebody with somebody.In addition, transfer gear 22 by 4WD lockable mechanisms 58 to do not make between rear truck drive shaft 26 and preceding truck drive shaft 24 produce The 4WD lockup states of raw rotational difference and the free position for allowing to produce therebetween among the non-lockup states of 4WD of rotational difference are cut Change.In addition, transfer gear 22 makes high-speed side gear stage (high-speed side speed change level) H and low speed side gear stage (low speed side speed change level) L In any one establishment, and will posteriorly be transmitted from the rotation speed change of speed changer 20.That is, transfer gear 22 is by input shaft 42 rotation is transmitted to rear wheel-side output shaft 44 via high low speed switching mechanism 48 and will be via front-wheel drive clutch 50 transmission torque is set in the state of zero and 4WD lockable mechanisms 58 have been released, and is not implemented from rear wheel-side output shaft 44 forward Take turns side output shaft 52 power transmission, and on the other hand, be passed via front-wheel drive clutch 50 torque or In the state of 4WD lockable mechanisms 58 have been engaged, implement from rear wheel-side output shaft 44, via drive gear 46, front-wheel drive Transmitted with chain 56 and driven gear 54 to the power of front wheel side output shaft 52.

Specifically, high low speed switching mechanism 48 possesses the epicyclic gearing 60 and high low speed sleeve of single pinion type 62.Epicyclic gearing 60 has：By can not relative to input shaft 42 around first axle C1 rotation in the way of be attached at institute State the central gear S on input shaft 42, be configured in relative to central gear S substantially with the heart and with can not be around first axle The mode of C1 rotations be attached inside engaged gear R on transfer gear shell 40, pair with these central gears S and internal messing tooth The row that multiple little gear P of wheel R engagements are supported in the way of it can carry out rotation and can be revolved round the sun around central gear S Gear rack CA.Therefore, central gear S rotating speed is constant speed relative to input shaft 42, and pinion frame CA rotating speed is relative It is decelerated in input shaft 42.In addition, being fixedly installed the high speed side gear gear teeth 64 on central gear S inner peripheral surface, and it is expert at It is fixedly installed on gear rack CA and the diameter identical low speed side gear teeth 66 of the high speed side gear gear teeth 64.The high speed side gear gear teeth 64 To export rotation, relevant with the high-speed side gear stage H establishment spline tooth with the constant speed of input shaft 42.Low speed side gear teeth 66 are, export rotation, relevant with the low speed side gear stage L establishment spline that low speed side is leaned on compared with the high speed side gear gear teeth 64 Tooth.High low speed sleeve 62 is fitted together in the way of it can carry out the relative movement on the direction parallel with first axle C1 by spline On rear wheel-side output shaft 44, and it is adjacent with fork linking part 62a and outer peripheral teeth 62b, the outer peripheral teeth 62b and fork linking part 62a Connect and be wholely set, and the outer peripheral teeth 62b passes through on the direction parallel with the first axle C1 of rear wheel-side output shaft 44 Move and engaged respectively with the high speed side gear gear teeth 64 and low speed side gear teeth 66.By making the high speed side gear gear teeth 64 and periphery Tooth 62b is engaged and is transmitted the rotation of the rotation constant speed with input shaft 42 to rear wheel-side output shaft 44, by making low speed side gear Tooth 66 engages with outer peripheral teeth 62b and passes the rotation being decelerated relative to the rotation of input shaft 42 to rear wheel-side output shaft 44 Pass.The high speed side gear gear teeth 64 are with high low speed sleeve 62 as the high-speed side gear stage clutch for forming high-speed side gear stage H Function, low speed side gear teeth 66 and high low speed sleeve 62 as formed low speed side gear stage L low speed side gear stage with from Clutch and function.

4WD lockable mechanisms 58 have the locking tooth 68 and locking sleeve being fixedly installed on the inner peripheral surface of drive gear 46 70, the locking sleeve 70 is can carry out the movement on first axle C1 directions and not relative to rear wheel-side output shaft 44 Can the mode that be rotated against and be entrenched in by spline on the rear wheel-side output shaft 44, in the periphery of the locking sleeve 70 On face, it is fixedly installed what is engaged by the movement on first axle C1 directions with being formed at the locking tooth 68 of drive gear 46 Outer peripheral teeth 70a.Card of the transfer gear 22 in the outer peripheral teeth 70a of the locking sleeve 70 4WD lockable mechanisms 58 engaged with locking tooth 68 Under conjunction state, rear wheel-side output shaft 44 will be rotated integrally with drive gear 46, so as to be formed 4WD lockup states.

High low speed sleeve 62 (is more specifically phase relative to the first bearing support 71 being arranged on input shaft 42 For epicyclic gearing 60) and be arranged in the space of the side of drive gear 46.Locking sleeve 70 with high low speed sleeve 62 Adjacent mode and be independently arranged in the space between high low speed switching mechanism 48 and drive gear 46.Transfer gear 22 has Abutted respectively with locking sleeve 70 with the high low speed sleeve 62 between high low speed sleeve 62 and locking sleeve 70 and to making height The first spring 72 in preloading condition for the side force that fast sleeve 62 is separated from each other with locking sleeve 70.Transfer gear 22 possesses Convex portion 44a respectively with rear wheel-side output shaft 44 between drive gear 46 and locking sleeve 70 is abutted, simultaneously with locking sleeve 70 To the second spring 74 in preloading condition for making locking sleeve 70 separate side force from locking tooth 68.First spring 72 is applied Power is set to larger compared with second spring 74.Convex portion 44a is to lock in the space of the radially inner side of drive gear 46 The only convex edge for the rear wheel-side output shaft 44 that the side of tooth 68 is provided projectingly.The high speed side gear gear teeth 64 are from parallel with first axle C1 When direction is observed, it is arranged on compared with low speed side gear teeth 66 further from the position of locking sleeve 70.High low speed sleeve 62 Outer peripheral teeth 62b high low speed sleeve 62 remote locking sleeve 70 side (in Fig. 2,3 be left side) and the high speed side gear gear teeth 64 engagements, and in side (being right side in Fig. 2,3) close to locking sleeve 70 of high low speed sleeve 62 and low speed side gear teeth 66 Engagement.The outer peripheral teeth 70a of locking sleeve 70 side (in Fig. 2,3 be right side) of the locking sleeve 70 close to drive gear 46 with Locking tooth 68 is engaged.Therefore, the position that the outer peripheral teeth 70a of locking sleeve 70 is engaged in high low speed sleeve 62 with low speed side gear teeth 66 Engaged with locking tooth 68 at the place of putting.

Front-wheel drive clutch 50 is many plate friction clutches, it possess in the way of it can not be rotated against and by The clutch spider hub 76 that is attached on rear wheel-side output shaft 44, in the way of it can not be rotated against it is attached at drive Clutch drum 78 on moving gear 46, it is inserted between clutch spider hub 76 and clutch drum 78 and optionally incites somebody to action the two The friction snap-fit element 80 of disconnection or connection, the piston 82 pressed friction snap-fit element 80.Front-wheel drive clutch 50 on the first axle C1 directions of rear wheel-side output shaft 44, are configured in around the first axle C1 of rear wheel-side output shaft 44 Relative to drive gear 46 with the high opposite side of low speed switching mechanism 48, it passes through the piston 82 that is moved to the side of drive gear 46 And friction snap-fit element 80 is pressed.Front-wheel drive clutch 50 is mobile to non-pushed side (being right side in Fig. 2,3) In the state of without being abutted with friction snap-fit element 80, as release conditions, the non-pushed side is to make piston 82 with the From the remote side of drive gear 46 on direction parallel one axis C1.On the other hand, front-wheel drive with clutch 50 to by In the state of pressure side (being left side in Fig. 2,3) movement with friction snap-fit element 80 so as to abut, pass through the amount of movement of piston 82 And transmission torque (torque capacity) is adjusted, so that as release conditions, slip state or complete fastening state, it is described Pressing side is to make piston 82 in side of the side parallel with first axle C1 upwardly close to drive gear 46.

Transfer gear 22 is in the front-wheel drive release conditions of clutch 50 and the outer peripheral teeth 70a and locking tooth of locking sleeve 70 Under the release conditions of the 68 4WD lockable mechanisms 58 not engaged, the power between rear wheel-side output shaft 44 and drive gear 46 is passed Pass path to block, and the power transmitted from speed changer 20 is only transmitted to trailing wheel 16.Transfer gear 22 front-wheel drive with from Under the slip state of clutch 50 or complete fastening state, the power transmitted from speed changer 20 is respectively forwardly taken turns into 14 and trailing wheel 16 Distribution.Transfer gear 22 allows rear wheel-side output shaft 44 and drive gear 46 under slip state of the front-wheel drive with clutch 50 Between rotation it is differential, so as to be formed differential state (the non-lockup states of 4WD).Transfer gear 22 is in front-wheel drive clutch Under 50 complete fastening state, rear wheel-side output shaft 44 is set to be rotated integrally with drive gear 46, so as to be formed 4WD locking shapes State.Front-wheel drive can be existed the torque distribution of front-wheel 14 and trailing wheel 16 by being controlled to transmission torque with clutch 50 Such as 0：100~50：Continuously changed between 50.

In transfer gear 22, as making high low speed switching mechanism 48, front-wheel drive clutch 50 and 4WD lockable mechanisms The device of 58 work, is also equipped with motor (actuator) 84 (reference picture 3), the rotary motion of motor 84 is converted to straight line fortune Dynamic thread mechanism 86, by the straight line power of thread mechanism 86 to high low speed switching mechanism 48, front-wheel drive with clutch 50 with And the transmission mechanism 88 that 4WD lockable mechanisms 58 are transmitted respectively.

Thread mechanism 86 relative to front-wheel drive with clutch 50 with the opposite side of drive gear 46 at surround with it is rear Take turns the identical first axle C1 of side output shaft 44 and configure, and possess：The worm-and-wheel gear 90 possessed via transfer gear 22 And the nut part (screwed part of a side) 92 as rotary part on motor 84 and nut portions are attached at indirectly Thread spindle part (screwed part of the opposing party) 94 that part 92 is screwed up, in order to thread spindle part 94 can not be exported in rear wheel-side Move and can not be configured around the mode that first axle C1 is rotated rear on the first axle C1 directions of axle 44 Take turns on side output shaft 44 so as to the end to the rear side of thread spindle part 94 and the transfer gear shell 40 as on-rotatably moving part it Between enter the connecting member 95 of joining line.In addition, nut part 92 is screwed up, screw thread via multiple balls 96 with thread spindle part 94 Mechanism 86 is, the ball-screw that nut part 92 is operated with thread spindle part 94 via multiple balls 96.In addition, screw thread Axle portion part 94 is needle bearing 97 to be supported by way of can rotating against by rear wheel-side output shaft 44.In this way and In the thread mechanism 86 of composition, make to be supported by rear wheel-side output shaft 44 by using motor 84 and as mutually screwing up The nut part 92 of thread spindle part 94 and the screwed part of any one party in nut part 92 surrounds rear wheel-side output shaft 44 first axle C1 and rotation driving, thus nut part 92 can rear wheel-side output shaft 44 first axle C1 directions it is enterprising Row movement.In addition, in the nut part 92 and thread spindle part 94 supported by rear wheel-side output shaft 44, by making nut Part 92 is screwed up with thread spindle part 94 so that nut part 92 with can surround rear wheel-side output shaft 44 first axle C1 And the mode rotated is supported on rear wheel-side output shaft 44, and thread spindle part 94 is made with not by connecting member 95 It can be moved on the first axle C1 directions of rear wheel-side output shaft 44 and the first axle of rear wheel-side output shaft 44 can not be surrounded Line C1 rotation mode and be supported on rear wheel-side output shaft 44.In addition, in the present embodiment, when as shown in Fig. 2 and Fig. 5 Like that, made by motor 84 nut part 92 around first axle C1 and to arrow mark F1 directions rotate when, nut portions Part 92 can by the effect of its screw thread between thread spindle part 94 on the C1 of first axle direction to away from front-wheel drive Moved with the direction of clutch 50, i.e. arrow mark F2 directions.

Worm-and-wheel gear 90 is to possess the worm screw 98 integrally formed with the motor shaft of motor 84 and to be formed at cydariform convex The gear mesh of worm gear 100a on wheel 100, the drum cam 100 is fixedly installed on the rear side that is formed at nut part 92 On the convex edge 92a of end.For example as brushless electric machine motor 84 rotation can via worm-and-wheel gear 90 to Nut part 92, which slows down, to be transmitted.The rotation of the motor 84 transmitted to nut part 92 is converted to the nut by thread mechanism 86 The linear motion of part 92.In addition, although by making motor 84 carry out rotation driving, so as to be concatenated, be fixedly installed The worm gear 100a formed on drum cam 100 on nut part 92 can be in the first axle C1 side of rear wheel-side output shaft 44 Move upwards, but the width dimensions on worm gear 100a first axle C1 directions are with forming the worm screw on above-mentioned motor shaft The width dimensions in 98 first axle C1 directions are compared and larger, though so that worm gear 100a is moved, worm gear 100a with The worm screw 98 formed on the motor shaft for the motor 84 being fixed on transfer gear shell 40 also engages all the time, and worm gear 100a Outer peripheral teeth be formed commutating tooth.

In transmission mechanism 88, possess by the linear motion of the nut part 92 in thread mechanism 86 to front-wheel drive with from The first transmission mechanism (the first transmission mechanism) 88a that clutch 50 is transmitted, cam engaging part described hereinafter will be linked with Movement of 103 fork shaft (the second axle) 102 on the 3rd axis (axle center) C3 directions is transmitted to high low speed switching mechanism 48 The second transmission mechanism (the second transmission mechanism) 88b, wherein, the cam engaging part 103 and be formed on drum cam 100 On cam path 100c engaging.In addition, as shown in Figures 2 to 4, cam engaging part 103 is attached on fork shaft 102, cydariform Cam 100 is attached on nut part 92.As shown in Fig. 2 and Fig. 5, drum cam 100 possesses：With being formed in motor 84 Motor shaft on worm screw 98 engage circular worm gear 100a, the worm gear 100a side of fork shaft 102 end from worm gear 100a is to close to the prominent teat 100b in the direction of rear truck drive shaft 26, the cam path being formed at teat 100b periphery 100c.In addition, above-mentioned teat 100b is, represent a part on worm gear 100a circumferencial direction to close to rear truck drive shaft 26 Direction protrude such as drum a part shape.To the drum cam among the both ends of rear wheel-side output shaft 44 The second bearing support 73 that the end of 100 sides is supported in the way of it can rotate is defeated in the rear wheel-side of drum cam 100 In the length range in the first axle C1 directions of shaft 44, the inner side of drum cam 100 is configured in.In addition, with drum cam The radial dimension R1 of 100 rear wheel-side output shaft 44 turns into the radial dimension of the rear wheel-side output shaft 44 of high low speed switching mechanism 48 Below the radial dimension R3 of the rear wheel-side output shaft 44 of R2 and front-wheel drive clutch 50 mode and to form cydariform convex Wheel 100.Above-mentioned size R2 is the inside engaged gear R or pinion frame CA of high low speed switching mechanism 48 outside dimension.On State the outside dimension for the clutch drum 78 that size R3 is front-wheel drive clutch 50.

As shown in fig. 6, the cam path 100c being formed on the periphery of drum cam 100 has：To defeated relative to rear wheel-side The first axle C1 of shaft 44 and the tilting cam groove portion 100d of inclined direction extension, formed tilting cam groove portion 100d's The end of the side of thread mechanism 86 and the conduct switching extended to the direction (vertical direction) orthogonal relative to first axle C1 First cam groove portion 100e of cam groove portion, formed at the tilting cam groove portion 100c end with the side opposite side of thread mechanism 86 The the second cam groove portion 100f extended at portion and relative to first axle C1 to vertical direction.According in this way and constitute Drum cam 100, such as shown in Fig. 6 (a), when the first cam groove portion from the cam path 100c in drum cam 100 The state that the top ends 103a of cam engaging part 103 is configured with 100e is risen, and nut part 92 is enclosed by motor 84 Rotated around first axle C1 to arrow mark F1 directions and make drum cam 100 around first axle C1 to arrow mark When note F1 directions are rotated, the top ends 103a of cam engaging part 103 can along drum cam 100 tilting cam groove portion 100d and moved with amount of movement D to the 3rd axis C3 directions that arrow mark F2 directions are fork shaft 102, the amount of movement D Pass through the screw thread between thread spindle part 94 in the amount of movement in arrow mark F2 directions, i.e. nut part 92 with nut part 92 Effect and the amount of movement that is moved to arrow mark F2 directions is compared and larger.That is, when logical from the state shown in Fig. 6 (a) Cross motor 84 and make nut part 92 around first axle C1 and to arrow mark F1 directions rotate when, pass through tilting cam groove Portion 100d, thus drum cam 100 with following amount of movement D relative to cam engaging part 103 fork shaft 102 the 3rd axle Line C3 is relatively moved on direction, and the amount of movement D is to pass through the spiral shell between thread spindle part 94 more than nut part 92 The effect of line and the amount of amount of movement moved to arrow mark F2 directions.In addition, for example as shown in Fig. 6 (c), when from drum It is configured with the top ends 103a's of cam engaging part 103 in the cam path 100c of shape cam 100 the second cam groove portion 100f State rises, and makes nut part 92 around first axle C1 to the direction in opposite direction with arrow mark F1 by motor 84 Rotate and make drum cam 100 around first axle C1 to when being rotated with arrow mark F1 directions in opposite direction, cam The top ends 103a of engaging part 103 by along the tilting cam groove portion 100d of drum cam 100 with amount of movement D to arrow mark The opposite direction in note F2 directions is moved, the opposite direction of the amount of movement D and nut part 92 in arrow mark F2 directions On amount of movement, i.e. nut part 92 by the effect of the screw thread between thread spindle part 94 to arrow mark F2 directions The amount of movement of opposite direction movement is compared and larger.That is, when motor 84 carries out rotation driving so as to via nut part 92 Make drum cam 100 around the first axle C1 of rear wheel-side output shaft 44 when rotating, by being formed on drum cam 100 Cam path 100c so that the cam engaging part 103 that engages with cam path 100c can be moved to first axle C1 directions, i.e., to The 3rd axis C3 directions movement of fork shaft 102.That is, when motor 84 carries out rotation driving so as to make drum via nut part 92 When shape cam 100 surrounds the first axle C1 of rear wheel-side output shaft 44 and rotated, drum cam 100 can be relative to cam card Close part 103 and relatively moved on the 3rd axis C3 directions of fork shaft 102.In addition, shown in Fig. 6 (b) and (c) The circle of single dotted broken line represents the top ends 103a of the cam engaging part 103 of Fig. 6 (a) position.Rear wheel-side output shaft 44 First axle C1, the second axis C2 of front wheel side output shaft 52 are parallel with the 3rd axis C3 difference of fork shaft 102.In addition, when from State for example shown in Fig. 6 (a) rises, made by motor 84 nut part 92 around first axle C1 to arrow mark Note F1 directions in opposite direction rotate and make drum cam 100 around first axle C1 to arrow mark F1 directions phase When anti-direction is rotated, cam engaging part 103 will not be fork shaft 102 to the first axle C1 directions of rear wheel-side output shaft 44 3rd axis C3 directions are moved, and cam engaging part 103 can be moved along the first cam groove portion 100e.That is, exist In the state of engaging in cam engaging part 103 and the first cam groove portion 100e, by the first cam groove portion 100e, no matter nut How part 92 is rotated around first axle C1 to the direction in opposite direction with arrow mark F1, prevents cam from engaging Movement of the part 103 on the 3rd axis C3 directions of fork shaft 102, that is, prevent cam engaging part 103 from existing with drum cam 100 Relative movement on 3rd axis C3 directions of fork shaft 102.

As shown in Figures 2 to 5, in the first transmission mechanism 88a, possesses the convex edge between piston 82 and nut part 92 Thrust bearing 105 between 92a, prevent piston 82 relative to relative shifting from nut part 92 to friction snap-fit element 80 side Dynamic stop component 107.Piston 82 is by thrust bearing 105 and stop component 107 with can not be relative to nut part 92 And relatively moved and can be concatenated around the first axle C1 modes rotated against in first axle C1 directions On nut part 92.Thus, the linear motion of the nut part 92 in thread mechanism 86 can be via the first transmission mechanism 88a It is passed to the piston 82 of front-wheel drive clutch 50.

In addition, as shown in Figures 2 to 5, possessing in the second transmission mechanism 88b：With trailing wheel in transfer gear shell 40 The first axle C1 configured in parallel of side output shaft 44 and it is supported by the way of it can be moved on the 3rd axis C3 directions Fork shaft 102, be fixedly installed on fork shaft 102 and link with high low speed sleeve 62 fork 104, by cam engaging part 103 First axle C1 directions are the wait from spring members 112 to fork shaft 102 that transmitted via of movement in the 3rd axis C3 directions Mechanism 106.In addition, above-mentioned wait mechanism 106 is arranged in cam engaging part 103.Therefore, in the second transmission mechanism 88b In, by the first axle C1 directions of cam engaging part 103 be the 3rd axis C3 directions movement via wait mechanism 106, fork Axle 102 and fork 104 and transmitted to the high low speed sleeve 62 of high low speed switching mechanism 48.Thus, when from such as Fig. 2 and Fig. 6 (a) shown in state rise and make cam engaging part 103 to arrow mark F2 directions move when, high low speed sleeve 62 is understood to drive Move the side of moving gear 46, i.e. the outer peripheral teeth 62b of high low speed sleeve 62 is moved to the position engaged with low speed side gear teeth 66. In addition, for example ought make from the state shown in Fig. 4 and Fig. 6 (c) cam engaging part 103 to arrow mark F2 directions When opposite direction is moved, high low speed sleeve 62 can leave side movement to from drive gear 46, i.e. make the outer of high low speed sleeve 62 All tooth 62b are moved to the position engaged with the high speed side gear gear teeth 64.

In addition, in transmission mechanism 88, possess the linear motion of the nut part 92 in thread mechanism 86 to 4WD lockings The 3rd transmission mechanism 88c that mechanism 58 is transmitted.It is same with the second transmission mechanism 88b in the 3rd transmission mechanism 88c, possess fork Axle 102, fork 104, wait mechanism 106, be also equipped with being attached at high low speed sleeve 62 on fork 104, high low speed sleeve 62 with The first spring 72 for being configured between locking sleeve 70 with the state of compression, in the convex of locking sleeve 70 and rear wheel-side output shaft 44 The second spring 74 configured between portion 44a with the state of compression.

Therefore, in the 3rd transmission mechanism 88c, cam engaging part 103 is made to arrow mark F2 when in the above described manner Direction move so that high low speed sleeve 62 outer peripheral teeth 62b to engage with low speed side gear teeth 66 position movement when, locking The thrust for having the locking direction towards the side of drive gear 46 can be acted on sleeve 70 via the first spring 72.Thus, lock sleeve The outer peripheral teeth 70a of cylinder 70 can overcome be set to compared with the first spring 72 and the force of weaker second spring 74 and to driving The side of gear 46 is moved, and is engaged with the locking tooth 68 of drive gear 46.In addition, when from the outer peripheral teeth 62b of high low speed sleeve 62 with The state that low speed side gear teeth 66 is engaged, which rises, makes cam engaging part 103 be moved to the opposite direction in arrow mark F2 directions, from And make the outer peripheral teeth 62b of high low speed sleeve 62 to the position engaged with the high speed side gear gear teeth 64 move when, meeting on locking sleeve 70 Due to second spring 74, effect has towards the thrust that direction is released from 4WD lockings of the drive gear 46 away from side.Thus, lock Only sleeve 70 can pass through the force of second spring 74 in the way of its outer peripheral teeth 70a is separated from the locking tooth 68 of drive gear 46 Moved to from drive gear 46 away from side.

In mechanism 106 is waited, as shown in figure 5, possessing：Cylinder part 108a, 108b of two subsidiary chimbs, its with In the way of it can be slided with fork shaft 102 and around the 3rd axis C3 configurations on direction parallel 3rd axis C3, and at it Set chimb is relative to each other on one end；Dividing plate 110, it is cylindrical shape, and between the cylinder part of two subsidiary chimbs Between 108a, 108b；Spring members 112, it is configured in preloading condition at the outer circumferential side of dividing plate 110；Part 114 is held, It is to two cylinder part 108a, 108b for attaching chimb in the way of can be in the square upward sliding parallel with the 3rd axis C3 And held.Part 114 is held to abut by the chimb with chimb cylinder part 108a, 108b and make chimb cylinder part 108a, 108b are slided on fork shaft 102.Chimb cylinder part 108a, 108b chimb are with holding the state that part 114 is abutted Under chimb between length turn into, it is longer compared with the length of dividing plate 110.Therefore, chimb is abutted with holding part 114 State formed by the force of spring members 112.In addition, in mechanism 106 is waited, on the outer peripheral face of fork shaft 102, tool The standby retainer 118a for making chimb cylinder part 108a, 108b each to be separated on the direction parallel with the 3rd axis C3, 118b.Chimb cylinder part 108a, 108b are set to separate by using retainer 118a, 118b, so that second In transmission mechanism 88b, can by the straight line power of nut part 92 via fork shaft 102 and fork 104 to high low speed switching machine Structure 48 is transmitted.

The outer peripheral teeth 70a of locking sleeve 70 makes the outer peripheral teeth 62b and low speed side gear teeth of high low speed sleeve 62 in fork shaft 102 Position (below, referred to as low-speed gear position) place of 66 engagements is engaged with locking tooth 68.Front-wheel drive clutch 50 rubs Wipe snap-fit element 80 fork shaft 102 make position that the outer peripheral teeth 62b of high low speed sleeve 62 engages with the high speed side gear gear teeth 64 (with Under, referred to as high speed gear position) place is not pressed by piston 82, do not passed through at the low-speed gear position of fork shaft 102 Piston 82 and be pressed.In addition, in figure 6, Fig. 6 (a) is to represent cam holding section when fork shaft 102 is high speed gear position The figure of the position of part 103, Fig. 6 (c) is the position for representing the cam engaging part 103 when fork shaft 102 is low-speed gear position Figure, Fig. 6 (b) is the cam in representing the switching that fork shaft 102 is switched over from high speed gear position to low-speed gear position The figure of the position of engaging part 103.In addition, nut ought be made by motor 84 for example from the state shown in Fig. 6 (a) Part 92 is drum cam 100 to when being rotated with arrow mark F1 directions in opposite direction, by the first cam groove portion 100e, from And cam engaging part 103 will not be moved to the 3rd axis C3 directions of fork shaft 102, but high speed tooth can be in fork shaft 102 Take turns in the state of position, front-wheel drive is never pressed against the position rubbed in engagement element 80 with the piston 82 of clutch 50 Rise to the position being pressed against in friction engagement element 80 and move.

At the high speed gear position of fork shaft 102, the length between chimb cylinder part 108a, 108b chimb can be made Change in chimb with holding between the length in the state of part 114 is abutted and the length of dividing plate 110.Therefore, mechanism is waited 106 in the state of the high speed gear position in fork shaft 102, leads in the front-wheel drive friction snap-fit element 80 of clutch 50 Cross piston 82 and between the position being pressed and the position not being pressed, allow nut part 92 parallel with first axle C1 Movement on direction.

Transfer gear 22 possesses, and low-speed gear additionally to fork shaft 102 is kept to the high speed gear position of fork shaft 102 The gear position maintaining body 120 (reference picture 2) that position is kept.Gear position maintaining body 120 possesses, in fork shaft 102 The reception hole 122 formed on the inner peripheral surface for entering the transfer gear shell 40 of line slip, the locking ball being accommodated in reception hole 122 124th, locking spring 126 from locking ball 124 to the side of fork shaft 102 that be incorporated in reception hole 122 and exerted a force to, it is formed on It is at the high speed gear position of fork shaft 102 that the part income of locking ball 124 is therein recessed on the outer peripheral face of fork shaft 102 Portion 128h and the part of locking ball 124 taken in into recess 128l therein at the low-speed gear position of fork shaft 102. By gear position maintaining body 120, so as to stop even in output of each gear position from motor 84, fork shaft 102 each gear position can be also kept.

Transfer gear 22 possesses the low-speed gear position detecting switch 130 detected to the low-speed gear position of fork shaft 102. Low-speed gear position detecting switch 130 is the contact-making switch of such as ball-type.Low-speed gear position detecting switch 130 with movement At the position contacted to the fork shaft 102 of low-speed gear position, the through hole to be formed on transfer gear shell 40 is fixedly set in In 132.When detecting low-speed gear position by low-speed gear position detecting switch 130, for example, light indicator, institute Stating indicator is used to the situation in 4WD lockup states with low speed side gear stage L notifying driver.

Fig. 1 is back to, possesses electronic-controlled installation (ECU) 200, the electronic-controlled installation (ECU) 200 in vehicle 10 Including the control device of the vehicle 10 for example switched over to 2WD states and 4WD states.Electronic-controlled installation 200 is for example by structure Turn into, including possess CPU (Central ProcessingUnit：Central processing unit), RAM (Random Access Memory： Random access memory), ROM (Read Only Memory：Read-only storage), the so-called microcomputer of input/output interface etc. Calculation machine, CPU by using RAM interim storage function and implement according to ROM program is pre-stored within signal transacting so as to Perform the various controls of vehicle 10.For example, electronic-controlled installation 200 performs the output control of engine 12, the driving of vehicle 10 Switching control of state etc., and as needed and be distinguished be configured to engine control use or driving condition control with etc.. It is supplied with as shown in Figure 1 and respectively in electronic-controlled installation 200, based on various sensors possessed in vehicle 10 etc. (such as engine speed sensor 202, motor angular sensor 204, each vehicle-wheel speed sensor 206, accelerator opening Sensor 208, for by driver operation to select high-speed side gear stage H H GSS Gear Select Switch 210, for passing through The operation of driver selects the 4WD selecting switch 212 of 4WD states, selects 4WD locking shapes for the operation by driver 4WD lockings selecting switch 214 of state etc.) detected by detection signal and various actual values (such as engine speed that obtains Ne, motor anglec of rotation θ m, front-wheel 14L, 14R and trailing wheel 16L, 16R each wheel speed Nwfl, Nwfr, Nwrl, Nwrr plus The H shelves line requirements Hon for the signal that fast device aperture θ acc, expression are operated to H GSS Gear Select Switch 210, expression are selected 4WD The 4WD for selecting the signal that switch 212 is operated requires 4WDon, represents to have carried out operation to 4WD lockings selecting switch 214 LOCKon of signal etc.).As shown in figure 1, from the output-controlling device respectively to engine 12 of electronic-controlled installation 200, front side Actuator, motor 84, transfer gear 22 of clutch 36 etc. and exporting has, such as output control for implementing engine 12 Engine output control command signal Se, the working instruction signal Sd switched over for the state to front side clutch 36, use Motor driving instruction signal Sm being controlled in the rotation amount to motor 84 etc..

In the above-described manner and in the vehicle 10 of composition, it is controlled by the rotation amount to motor 84 come to nut portions The amount of movement (stroke) of part 92 is controlled.At the high speed gear position of fork shaft 102, by piston 82 not with friction snap-fit element 80 positions abutted, the position for the piston 82 that front-wheel drive clutch 50 will be set to release conditions are set to, for by car 10 are set to the position (hereinafter referred to as H2 of 2WD transport conditions that is only driven with high-speed side gear stage H to trailing wheel 16 Put).When clutch 36 is set as release conditions on front side of at the H2 positions in the piston 82, in 2WD travelings, constituting from drive Moving gear 46 is (drive gear 46, preceding with each rotate element of the power transfer path untill differential gearing 28 to front-wheel Wheel drive chain 56, driven gear 54, front wheel side output shaft 52, preceding truck drive shaft 24, front-wheel differential gearing 28 etc.) On, both do not transmitted and rotated from the side of engine 12, and also do not transmitted and rotate from the side of front-wheel 14.Therefore, in 2WD travelings, each rotation Turn element to stop the rotation, so as to prevent the situation that each rotate element is driven to rotate, and then reduce running resistance.

In addition, as shown in Fig. 2 at the high speed gear position of fork shaft 102, front-wheel drive clutch 50 will be set to sliding The position of the piston 82 of shifting state is set to, for vehicle 10 to be set to high-speed side gear stage H to front-wheel 14 and trailing wheel 16 The position (below, referred to as H4 positions) of the 4WD transport conditions of power is transmitted, wherein, it is described front-wheel drive clutch 50 positions for being set to the piston 82 of slip state are, by from piston 82 not with the position that friction snap-fit element 80 is abutted, it is right Motor 84 with predetermined rotation amount is driven and make nut part 92 to pressing side correspondingly move predetermined stroke so that The position for making piston 82 be abutted with friction snap-fit element 80.At the H4 positions of the piston 82, pass through the pressing according to piston 82 Power and front-wheel drive is controlled with the transmission torque of clutch 50, so as to carry out turning to front-wheel 14 and trailing wheel 16 as needed Square distribution is adjusted.

In addition, at the low-speed gear position of fork shaft 102, as shown in figure 4, because front-wheel drive clutch 50 is set as Release conditions and 4WD lockable mechanisms 58 are set as fastening state, therefore are set as being used for low speed side gear stage L by vehicle 10 The position (being referred to as L4 positions) for the 4WD transport conditions being set under 4WD lockup states.

As described above, according to the transfer gear 22 of the present embodiment, trailing wheel is surrounded when making nut part 92 by motor 84 The first axle C1 of side output shaft 44 and during rotation driving, nut part 92 is in the first axle C1 directions of rear wheel-side output shaft 44 The linear motion of upper movement and nut part 92 is passed to front-wheel drive clutch via the first transmission mechanism 88a 50.In addition, working as the first axle C1 for making nut part 92 surround rear wheel-side output shaft 44 by motor 84 and rotation driving When, the drum cam 100 being attached on nut part 92 can be rotated, and the cam engaging engaged with cam path 100c Part 103 can be moved to the 3rd axis C3 directions of fork shaft 102, i.e. the drum cam 100 being attached on nut part 92 enters Row is rotated, and drum cam 100 is carried out relative to cam engaging part 103 on the 3rd axis C3 directions of fork shaft 102 Relative movement, so that the movement of the fork shaft 102 in cam engaging part 103 is passed to height via the second transmission mechanism 88b Low speed switching mechanism 48.Thus, due to the straight line of the nut part 92 of thread mechanism 86 being arranged on rear wheel-side output shaft 44 Motion be passed to front-wheel drive clutch 50 via the first transmission mechanism 88a, therefore no longer need as prior art that Sample is as set ball cam with leading screw for adjusting the transmission torque of front-wheel drive clutch 50, so as to suitably Shorten the distance between rear wheel-side output shaft 44 and fork shaft 102, and then can minimize transfer gear 22.

In addition, according to the transfer gear 22 of the present embodiment, cam engaging part 103 is attached on fork shaft 102, drum cam 100 are attached on nut part 92.Therefore, in order to implement the switch operating of high low speed switching mechanism 48 and by drum cam 100 are attached on the nut part 92 for the thread mechanism 86 being arranged on rear wheel-side output shaft 44.Thus, due to no longer need as Drum cam is arranged on the second axle by prior art like that, therefore is no longer needed as drum cam is arranged on the second axle Existing transfer gear makes institute of the drum cam being arranged on second axle not with being arranged on the output shaft like that State high low speed switching mechanism and the clutch is interfered, so as to suitably shorten rear wheel-side output shaft 44 and fork shaft The distance between 102.

In addition, according to the transfer gear 22 of the present embodiment, nut part 92 is can surround the first of rear wheel-side output shaft 44 Axis C1 and the mode that rotates are supported by, and thread spindle part 94 is with can not be on the first axle C1 directions of rear wheel-side output shaft 44 Move and can not be supported by around the first axle C1 of rear wheel-side output shaft 44 modes rotated.In this way, when by electric Motivation 84 and when making 92 rotation driving of nut part, nut part 92 can be on the first axle C1 directions of rear wheel-side output shaft 44 Move and the linear motion of nut part 92 can be passed to front-wheel drive clutch via the first transmission mechanism 88a Device 50.Also, when making 92 rotation driving of nut part by motor 84, the cydariform being attached on nut part 92 is convex Wheel 100 can be rotated, so that threeth axis C3 of the meeting of cam engaging part 103 engaged with cam path 100c in fork shaft 102 Moved on direction, and the linear motion of cam engaging part 103 can be passed to height via the second transmission mechanism 88b Low speed switching mechanism 48.

In addition, according to the transfer gear 22 of the present embodiment, because the cydariform among the both ends to rear wheel-side output shaft 44 is convex The second bearing support 73 that the end of 100 sides is supported in the way of it can rotate is taken turns, in the rear wheel-side of drum cam 100 The inner side of drum cam 100 is configured in the length range in the first axle C1 directions of output shaft 44, therefore is suitably shortened The length of size of the rear wheel-side output shaft 44 on the first axle C1 directions in transfer gear 22.

In addition, according to the transfer gear 22 of the present embodiment, in the cam path 100c being formed on drum cam 100, possessing To the tilting cam groove portion 100d of the first axle C1 relative to rear wheel-side output shaft 44 and the extension of inclined direction, when passing through electricity Motivation 84 and nut part 92 is rotated and is made after drum cam 100 surrounds around the first axle C1 of rear wheel-side output shaft 44 When the first axle C1 for taking turns side output shaft 44 is rotated, tilting cam groove portion of the meeting of cam engaging part 103 along drum cam 100 100d and with larger shifting compared with the amount of movement on the first axle C1 directions of the rear wheel-side output shaft 44 of nut part 92 Momentum D, and moved up in the 3rd axis C3 side of fork shaft 102.Therefore, in high low speed switching mechanism 48 to high-speed side gear The response that level H and low speed side gear stage L are switched over for example by the rear wheel-side of the nut part 92 in thread mechanism 86 Movement on the first axle C1 directions of output shaft 44 come to high-speed side gear stage H compared with low speed side gear stage L is switched over And be significantly increased.

In addition, according to the transfer gear 22 of the present embodiment, in the cam path 100c being formed on drum cam 100, possessing To the first cam groove portion 100e of the first axle C1 relative to rear wheel-side output shaft 44 and the extension of orthogonal direction, when passing through electricity Motivation 84 and make nut part 92 around first axle C1 to being rotated with arrow mark F1 directions in opposite direction and make drum Shape cam 100 with direction in opposite direction arrow mark F1 around first axle C1 to when rotating, and cam engaging part 103 is not It can be moved to the 3rd axis C3 directions of fork shaft 102, and cam engaging part 103 can be entered along the first cam groove portion 100e Row movement.That is, cam engaging part 103 can be made along the first cam groove portion 100e by using the first cam groove portion 100e And move, nut part 92 can be moved on the first axle C1 directions of rear wheel-side output shaft 44, so that nut portions The linear motion of part 92 is passed to front-wheel drive clutch 50 via the first transmission mechanism 88a.Therefore, it is possible to by height Low speed switching mechanism 48 is switched in the state of high-speed side gear stage H, by front-wheel drive with clutch 50 polar driving tooth The transmission torque of the transmission of wheel 46 is adjusted.

In addition, according to the transfer gear 22 of the present embodiment, nut part 92 via multiple balls 96 with thread spindle part 94 Screw up.Therefore, because rotating against between nut part 92 and thread spindle part 94 becomes smooth, thus it is electronic during work The required electric power of machine 84 can stably decline.

In addition, according to the transfer gear 22 of the present embodiment, front-wheel drive clutch 50 is what polar driving gear 46 was transmitted The clutch that transmission torque is adjusted, front-wheel drive clutch 50 is multi-plate clutch.Therefore, it is possible to implement front-wheel drive With clutch 50 transmission torque continuous variable control, so as to further implemented according to driving condition to front-wheel 14, The driving force distribution control of trailing wheel 16.

In addition, according to the transfer gear 22 of the present embodiment, the second transmission mechanism 88b possesses, by cam engaging part 103 in fork The wait mechanism 106 that movement on 3rd axis C3 directions of axle 102 is transmitted via spring members 112 to fork shaft 102.Cause This, during the switching of the high-speed side gear stage H and low speed side gear stage L in high low speed switching mechanism 48, cuts with high low speed The switching of converting mechanism 48 and the impact that produces can be absorbed by waiting the spring members 112 of mechanism 106.

Next, other embodiments to the present invention are illustrated.In addition, pair common with previously described embodiment 1 Part mark identical symbol and the description thereof will be omitted.

Embodiment 2

Fig. 7 to Figure 10 is the figure illustrated to the transfer gear 134 of other embodiments of the present invention.Point of the present embodiment Dynamic device 134 is compared with the transfer gear 22 of embodiment 1, it is following what time on it is different, i.e. cam engaging part 136 is concatenated On the nut part 140 of thread mechanism 138, drum cam 142 is attached on fork shaft 102 via mechanism 144 is waited, if Be placed in the first transmission mechanism (the first transmission mechanism) 88d thrust bearing 154 and stop component 156 shape it is different , the shape for the wait mechanism 144 being arranged on the second transmission mechanism (the second transmission mechanism) 88e is different, other aspects Transfer gear 22 with embodiment 1 is roughly the same.

As shown in Fig. 7 and Fig. 9, thread mechanism 138 relative to front-wheel drive with clutch 50 with drive gear 46 Surrounded at opposite side with the identical first axle C1 of rear wheel-side output shaft 44 and configure, and the thread mechanism 138 possesses： The spiral shell as rotary part linked indirectly with motor 84 via the worm-and-wheel gear 146 possessed in transfer gear 134 Auxiliary assembly 140, the thread spindle part 148 screwed up with nut part 140, in order to by thread spindle part 148 with can not be in rear wheel-side The first axle C1 side of output shaft 44 moves up and can not configured around the first axle C1 modes rotated in rear wheel-side output On the axle 44 and end to the rear side of thread spindle part 148 and enter joining line as between the transfer gear shell 40 of on-rotatably moving part Connecting member 150.In addition, nut part 140 is screwed up, thread mechanism via multiple balls 152 with thread spindle part 148 138 are, the ball-screw that nut part 140 works with thread spindle part 148 via multiple balls 152.In addition, screw spindle part Part 148 by way of needle bearing 153 is rotated against can be supported on rear wheel-side output shaft 44.With this Mode and in the thread mechanism 138 that constitutes, make to be supported in by using motor 84 on rear wheel-side output shaft 44 and mutually The thread spindle part 148 screwed up and the rotation driving of nut part 140, so that nut part 140 is in rear wheel-side output shaft 44 First axle C1 directions on move.That is, thread mechanism 138 will be transmitted to the rotation of the motor 84 of nut part 140 Be converted to the linear motion of the nut part 140.In addition, the nut part 140 being supported on rear wheel-side output shaft 44 with And in thread spindle part 148, by screwing up nut part 140 and thread spindle part 148 so that nut part 140 is with can It is supported in around the first axle C1 of rear wheel-side output shaft 44 modes rotated on rear wheel-side output shaft 44, and passes through linking part Part 150 and make thread spindle part 148 to move up and can not surround in the first axle C1 side of rear wheel-side output shaft 44 The first axle C1 of rear wheel-side output shaft 44 and the mode that rotates are supported on rear wheel-side output shaft 44.In addition, in this implementation In example, as shown in Fig. 7 and Fig. 9, when nut part 140 surrounds first axle C1 by motor 84 to arrow mark F1 side To rotate when, nut part 140 by the effect of the screw thread between thread spindle part 148 on the C1 of first axle direction to With the remote direction of clutch 50 it is that arrow mark F2 directions are moved from front-wheel drive.

In transmit the linear motion of the nut part 140 in thread mechanism 138 to front-wheel drive clutch 50 In one transmission mechanism 88d, as shown in figure 9, possessing the thrust axis between piston 82 and the convex edge 140a of nut part 140 Hold 154 and prevent piston 82 relative to relative movement from nut part 140 to friction snap-fit element 80 side ring-type stop Part 156.Piston 82 is by thrust bearing 154 and stop component 156 with can not be relative to nut part 140 first Relatively moved on axis C1 directions and nut part can be attached at around the first axle C1 modes rotated against On 140.Thus, the linear motion of the nut part 140 in thread mechanism 138 is passed to via the first transmission mechanism 88d The piston 82 of front-wheel drive clutch 50.

As shown in Figure 7 to 9, cam engaging part 136 is concatenated the ring-type of (with reference to) in worm-and-wheel gear 146 On worm gear 146a, when the first axle for making worm gear 146b surround rear wheel-side output shaft 44 by motor 84 and via worm screw 146b When line C1 is rotated, cam engaging part 136 can surround the first axle of rear wheel-side output shaft 44 together with nut part 140 C1 is rotated.In addition, though by making the rotation driving of motor 84, worm gear 146a can rear wheel-side output shaft 44 first axle Line C1 is moved on direction, but worm gear 146a outer peripheral teeth 146c is formed commutating tooth, even if so that worm gear 146a is first Axis C1 side is moved up, and can also be engaged all the time with the worm screw 146b being formed on the motor shaft of motor 84.In addition, worm gear snail Linkage 146 is the gear mesh for possessing worm gear 146a and worm screw 146b.

As shown in figure 9, waiting mechanism 144 to be configured in the way of it can be slided with fork shaft 102, in the wait mechanism On 144 end, possess the cylinder part 158 for being formed with a pair of convex edge 158a, 160a subsidiary chimbs, 160, one To the spring between the convex edge 158a, 160a is configured in the cylinder part 158,160 of subsidiary chimb with preloading condition Part 162, the stop component 164 with ring-type and to the cylinder parts 158,160 of a pair of subsidiary chimbs with can with the 3rd axle Holdings part 166 that the mode that the parallel directions of line C3 are slided is held, the circle for preventing in fork shaft 102 a pair of subsidiary chimbs Cartridge unit 158,160 is upwardly away from the first retainer 168 of ring-type more than preset distance in the side parallel with the 3rd axis C3 And second retainer 170, prevent the cylinder part 158,160 of a pair of subsidiary chimbs from surrounding the 3rd axle relative to fork shaft 102 The spherical rotation that line C3 is rotated prevents ball 172.In the above described manner and in the wait mechanism 144 of composition, for example, work as cydariform Cam 142 to arrow mark F2 directions move when, by the chimb for making holding part 166 and the cylinder part 158 of subsidiary chimb Portion 158a abut, and make subsidiary chimb cylinder part 160 convex edge 160a via spring members 162 with the second retainer 170 abut, so that fork shaft 102 can be moved to arrow mark F2 directions.In addition, for example drum cam 142 to arrow mark When direction in opposite direction F2 is that arrow mark F4 directions are moved, due to being arranged at the stop component held on part 166 164 can abut with the convex edge 160a of the cylinder part 160 of subsidiary chimb, and attach the chimb of the cylinder part 158 of chimb Portion 158a can be abutted via spring members 162 with the first retainer 168, so that fork shaft 102 can enter to arrow mark F4 directions Row movement.In addition, fork shaft 102 be in high speed gear position at and such as drum cam 142 be intended to arrow mark F4 directions move When dynamic, due to spring members 162 are compressed and attach the cylinder part 160 of chimb can be to the cylinder part with subsidiary chimb 158 close directions are moved, so as to allow movement of the drum cam 142 to arrow mark F4 directions.In addition, in fork shaft 102 at the low-speed gear position and such as drum cam 142 be intended to arrow mark F2 directions move when, due to spring members 162 are compressed and attach the cylinder part 158 of chimb and can be moved to the close direction of the cylinder part 160 of subsidiary chimb, So as to allow movement of the drum cam 142 to arrow mark F2 directions.In addition, on transfer gear shell 40, being formed with to fork The support 40a that the end of the side of trailing wheel 16 of axle 102 is supported, on fork shaft 102, being integrally provided with makes fork shaft 102 low Fast gear position abuts with the support 40a of transfer gear shell 40 and prevents fork shaft 102 from low-speed gear position to arrow The stop component 174 of the ring-type of the movement in the direction of flag F 2.In addition, although not shown, but possess in transfer gear 134 and prevent fork shaft 102 from high speed gear position to arrow mark F4 directions movement stop component.In addition, drum cam 142 is by integratedly Be attached at wait mechanism 144 holding part 166 on, and as shown in figure 8, drum cam 142 with hold part 166 it Between, it is linked with a pair of strengthening parts 176 that the intensity for the link for making drum cam 142 with holding part 166 is improved.

As shown in figure 8, periphery of the drum cam 142 along worm gear 146a and be formed part-cylindrical shape, and will Drum cam 142 and worm gear 146a, which is abutted, to be configured, so that cam engaging part 136 is with being formed at the inner circumferential of drum cam 142 Cam path 142a engaging, i.e. cam engaging part 136 is configured in cam path 142a.

As shown in Figure 10, being formed at the cam path 142a at the inner circumferential of drum cam 142 has：To relative to fork shaft 102 The 3rd axis C3 and the tilting cam groove portion 142b of inclined direction extension, be formed at tilting cam groove portion 142b with wait The end of the side opposite side of mechanism 144 and the conduct switching cam path extended to the direction orthogonal relative to the 3rd axis C3 The first cam groove portion 142c in portion, be formed at tilting cam groove portion 142b the side of wait mechanism 144 end and to relative to 3rd axis C3 and the second cam groove portion 142d of orthogonal direction extension.According to the drum cam 142 of composition in this way, For example as Figure 10 (a) shown in, when from cam path 142a the first cam groove portion 142c in tilting cam groove portion 142b sides End in be configured with cam engaging part 136 state rise, made by motor 84 nut part 140 surround first axle C1 and rotated to arrow mark F1 directions and make cam engaging part 136 around first axle C1 to arrow mark F1 side To rotate when, drum cam 142 can along tilting cam groove portion 142b with following amount of movement to arrow mark F2 directions be fork The 3rd axis C3 directions movement of axle 102, the amount of movement is, more than shifting of the nut part 140 on arrow mark F2 directions Momentum, i.e. nut part 140 are moved by the effect of the screw thread between thread spindle part 148 to arrow mark F2 directions The amount of dynamic amount of movement.In addition, for example, as shown in Figure 10 (c), matching somebody with somebody when from cam path 142a the second cam groove portion 142d Be equipped with cam engaging part 136 state rise, made by motor 84 nut part 140 around first axle C1 and to arrow The opposite directions of labeling head F1 rotate and make cam engaging part 136 around first axle C1 to arrow mark F1 directions When opposite direction is rotated, drum cam 142 can along tilting cam groove portion 142b with following amount of movement to arrow mark Direction (arrow mark F4 directions) in opposite direction F2 is that the 3rd axis C3 directions of fork shaft 102 are moved, the amount of movement For, more than amount of movement, i.e. nut part 140 of the nut part 140 on the direction in opposite direction with arrow mark F2 by with The effect of screw thread between thread spindle part 148 and the amount of movement that is moved to the direction in opposite direction with arrow mark F2 Amount.That is, when motor 84 carries out rotation driving so that cam engaging part 136 surrounds rear wheel-side via nut part 140 When the first axle C1 of output shaft 44 is rotated, by making cam engaging part 136 convex on drum cam 142 with being formed at Race 142a engages and drum cam 142 is moved up in the 3rd axis C3 side of fork shaft 102.That is, when motor 84 is carried out Rotation driving is so that cam engaging part 136 surrounds the first axle C1 of rear wheel-side output shaft 44 via nut part 140 When being rotated, drum cam 142 can be enterprising in the 3rd axis C3 directions of fork shaft 102 relative to cam engaging part 136 Row relative movement.In addition, the circle of the single dotted broken line shown in Figure 10 (b) and (c) represents Figure 10 (a) cam engaging part 136 position.

As shown in fig. 7, movement on the 3rd axis C3 directions of the fork shaft 102 by drum cam 142 is linked with is to height In the second transmission mechanism 88e that low speed switching mechanism 48 is transmitted, possess fork shaft 102, fork 104, by drum cam 142 the The wait mechanism 144 that movement on three axis C3 directions is transmitted via spring members 162 to fork shaft 102.Therefore, In two transmission mechanism 88e, for example when make from the state shown in Figure 10 (a) drum cam 142 to arrow mark F2 directions move When dynamic, high low speed sleeve 62 can be moved to the side of drive gear 46, i.e., the outer peripheral teeth 62b of high low speed sleeve 62 can to low speed side tooth The position movement that the gear teeth 66 are engaged.In addition, for example when make from the state shown in Figure 10 (c) drum cam 142 to arrow When the direction in opposite direction of flag F 2 (arrow mark F4 directions) is mobile, high low speed sleeve 62 can to from drive gear 46 away from one Side movement, the outer peripheral teeth 62b of i.e. high low speed sleeve 62 can be moved to the position engaged with the high speed side gear gear teeth 64.In addition, in figure In 10, the figure of the position of the drum cam 142 when Figure 10 (a) is represents fork shaft 102 in high speed gear position, Figure 10's (c) figure of the position of the drum cam 142 when to represent fork shaft 102 in low-speed gear position, Figure 10 (b) is expression fork shaft The figure of the position of 102 drum cam 142 from high speed gear position to low-speed gear position in switching.In addition, when from for example scheming State shown in 10 (a) rises, made by motor 84 the cam engaging part 136 that engages with the first cam groove portion 142c to When direction in opposite direction is that arrow mark F3 directions are rotated with arrow mark F1, drum cam 142 will not be to the of fork shaft 102 Three axis C3 directions are moved, but the state that can be in high speed gear position with fork shaft 102 makes front-wheel drive clutch The position that the position that 50 piston 82 is never pressed against in friction snap-fit element 80 rubs in snap-fit element 80 to being pressed against It is mobile.That is, in the state of being in the first cam groove portion 142c engaging and having a cam engaging part 136, the first cam groove portion is passed through 142c, from regardless of whether with nut part 140 link cam engaging part 136 how around first axle C1 and to arrow mark Remember that F1 directions in opposite direction are rotated, prevent drum cam 142 in the movement in the 3rd axis C3 directions of fork shaft 102, i.e. convex Relative movement of the engaging part 136 with drum cam 142 on the 3rd axis C3 directions of fork shaft 102 is taken turns to be prevented from.In addition, In high low speed switching mechanism 48, when fork shaft 102 is in high speed gear position, high-speed side gear stage H is set up, and is in fork shaft 102 Low speed side gear stage L is set up during low-speed gear position.

As described above, according to the transfer gear 134 of the present embodiment, being driven when making the rotation of nut part 140 by motor 84 When dynamic, nut part 140 can be moved and nut part 140 on the first axle C1 directions of rear wheel-side output shaft 44 Linear motion can be passed to front-wheel drive clutch 50 via the first transmission mechanism 88d.Pass through motor 84 in addition, working as And when making 140 rotation driving of nut part, the cam engaging part 136 being attached on nut part 140 can be rotated from And drum cam 142 can be moved in the 3rd axis C3 directions of fork shaft 102, that is, it is attached at convex on nut part 140 Wheel engaging part 136 can carry out rotating so as to which drum cam 142 can be relative to cam engaging part 136 the of fork shaft 102 Relatively moved on three axis C3 directions, and the mobile of the fork shaft 102 in drum cam 142 can be via the second transmission mechanism 88e and be passed to high low speed switching mechanism 48.Thus, due to the thread mechanism 138 that is arranged on rear wheel-side output shaft 44 The linear motion of nut part 140 is passed to front-wheel drive clutch 50 via the first transmission mechanism 88d, therefore is not required to Ball cam and leading screw are for example set as prior art and are used for the transmission torque that adjusts front-wheel drive clutch 50, It so as to suitably shorten the distance between rear wheel-side output shaft 44 and fork shaft 102, and then can minimize transfer gear 22.

In addition, according to the transfer gear 134 of the present embodiment, motor 84 is attached at spiral shell via worm-and-wheel gear 146 On the nut part 140 of line mechanism 136, cam engaging part 136 is attached on the worm gear 146a of worm-and-wheel gear 146, Drum cam 142 is attached on fork shaft 102, periphery of the drum cam 142 along worm gear 146a and be formed local cylinder Shape.Configured therefore, because drum cam 142 and worm gear 146a can be abutted, it is defeated therefore, it is possible to suitably shorten rear wheel-side The distance between shaft 44 and fork shaft 102.

In addition, according to the transfer gear 134 of the present embodiment, in the cam path 142a being formed on drum cam 142, possessing To the tilting cam groove portion 142b of the 3rd axis C3 relative to fork shaft 102 and the extension of inclined direction, when passing through motor 84 And making nut part 140 around the first axle C1 of rear wheel-side output shaft 44 when being rotated, drum cam 142 can be by inclining Oblique cam groove portion 142b and with the amount of movement more than nut part 140 on the first axle C1 directions of rear wheel-side output shaft 44 Amount of movement and to fork shaft 102 the 3rd axis C3 directions move.Therefore, the high-speed side gear stage H of high low speed switching mechanism 48 with The response of low speed side gear stage L switching with for example by the nut part 140 in thread mechanism 138 in rear wheel-side output shaft Movement on 44 first axle C1 directions and to high-speed side gear stage H compared with the situation that low speed side gear stage L is switched over And be significantly increased.

In addition, according to the transfer gear 134 of the present embodiment, the second transmission mechanism 88e possesses the fork shaft in drum cam 142 The wait mechanism 144 that movement on 102 the 3rd axis C3 directions is transmitted via spring members 162 to fork shaft 102.Cause This, in the high-speed side gear stage H and low speed side gear stage L of high low speed switching mechanism 48 switching, switches with high low speed The switching of mechanism 48 and the impact that produces can be absorbed by waiting the spring members 162 of mechanism 144.

Next, other embodiments to the present invention are illustrated.In addition, pair common with previously described embodiment 2 Part mark identical symbol and omit the description.

Embodiment 3

Figure 11 to Figure 17 is the figure illustrated to the transfer gear 178 of other embodiments of the present invention.The present embodiment Transfer gear 178 is different on following point compared with the transfer gear 134 of embodiment 2, i.e. cam engaging part 180 and The shape of drum cam 182 is different and outer peripheral teeth 70a of the locking sleeve 70 when fork shaft 102 is in low-speed gear position Do not engaged with locking tooth 68, and other aspects are roughly the same with the transfer gear 134 of embodiment 2.

As shown in figure 11, cam engaging part 180 is concatenated the worm gear of the ring-type of (with reference to) in worm-and-wheel gear 146 On 146a, when the first axle C1 for making worm gear 146b surround rear wheel-side output shaft 44 via worm screw 146b by motor 84 enters When row is rotated, cam engaging part 180 can surround the first axle C1 of rear wheel-side output shaft 44 and enter together with nut part 140 Row is rotated.

Drum cam 182 is integratedly attached on the holding part 166 for waiting mechanism 144, although not shown, but in cydariform Cam 182 and hold between part 166, be linked with for example in fig. 8 a pair of shown a pair of strengthening parts, 176 identical plus Strong part.In addition, periphery of the drum cam 182 along worm gear 146a and be formed part-cylindrical shape, and so that cam The mode that engaging part 180 engages with the cam path 182a being formed at the inner circumferential of drum cam 182, i.e., with by cam holding section Part 180 configures the mode in cam path 182a and abuts drum cam 182 and worm gear 146a and configure.

As shown in Figure 12 and Figure 14, being formed at the cam path 182a at the inner circumferential of drum cam 182 has：To relative to 3rd axis C3 of fork shaft 102 and the first tilting cam groove portion (tilting cam groove portion) 182b of inclined direction extension, by shape On into the end of the side of trailing wheel 16 in the first tilting cam groove portion 182b and to the 3rd axis C3 relative to fork shaft 102 and it is orthogonal Direction extension as switching cam groove portion the first switching cam groove portion 182c, be formed on the first tilting cam groove portion 182b with the end of the side opposite side of trailing wheel 16 and orthogonal direction extends to the 3rd axis C3 relative to fork shaft 102 As switching cam groove portion the second switching cam groove portion 182d, to the 3rd axis C3 relative to fork shaft 102 and it is inclined Direction extension the second tilting cam groove portion (tilting cam groove portion) 182e, to the first tilting cam groove portion 182b and trailing wheel 16 Be attached with the end of the side opposite side of trailing wheel 16 the of the end of side opposite side and the second tilting cam groove portion 182e One connection groove section 182f, the end to the first tilting cam groove portion 182b side of trailing wheel 16 are with the second tilting cam groove portion 182e's The second connection groove section 182g that the end of the side of trailing wheel 16 is attached.In addition, the first tilting cam groove portion 182b and second is tilted Cam groove portion 182e is configured in mutually opposing mode.In addition, when Figure 12 is represents fork shaft 102 in high speed gear position The figure of the position of drum cam 182, the position of the drum cam 182 when Figure 14 is represents fork shaft 102 in low-speed gear position Figure.

As shown in figure 12, in the first switching cam groove portion 182c, cam path is switched in cam engaging part 180 and first In the state of portion 182c engagings, even if making nut part 140 i.e. cam engaging part 180 surround rear wheel-side by motor 84 The first axle C1 of output shaft 44 and rotated, but due to first switching cam groove portion 182c to relative to the 3rd axis C3 Orthogonal direction extends, therefore drum cam 182 will not also be moved to the 3rd axis C3 directions of fork shaft 102.That is, in cam card In the state of conjunction part 180 engages with the first switching cam groove portion 182c, no matter how nut part 140 is around rear wheel-side output The first axle C1 of axle 44 and rotated, prevent cam engaging part 180 with drum cam 182 the 3rd of fork shaft 102 Relative movement on axis C3 directions.Therefore, when the shape engaged from cam engaging part 180 with the first switching cam groove portion 182c State rises, and cam engaging part 180 is rotated around first axle C1 to arrow mark F3 directions by motor 84 When, in the state of fork shaft 102 is in high speed gear position front-wheel drive can be made never to be pressed with the piston 82 of clutch 50 Moved to the position being pressed in friction snap-fit element 80 position in friction snap-fit element 80.In addition, in fig. 12, with What the cam engaging part 180 of the first switching cam groove portion 182c engagings was rotated by motor 84 to arrow mark F3 directions In the range of, fork shaft 102 is at high speed gear position and front-wheel drive with the piston 82 of clutch 50 is not pressed against friction Front-wheel drive is used when the slewing area of cam engaging part 180 in snap-fit element 80, i.e. fork shaft 102 are in high speed gear position The slewing area for the cam engaging part 180 that clutch 50 is discharged is expressed as the first scope H2.In addition, in fig. 12, with What the cam engaging part 180 of the first switching cam groove portion 182c engagings was rotated by motor 84 to arrow mark F3 directions In the range of, by fork shaft 102 be in high speed gear position at and front-wheel drive clutch 50 piston 82 be pressed against friction card Close when the slewing area of the cam engaging part 180 on element 80, i.e. fork shaft 102 are in high speed gear position and used with front-wheel drive The slewing area for the cam engaging part 180 that clutch 50 engages is expressed as the second scope H4.

Figure 13 be drum cam 182 when switching to fork shaft 102 from from high speed gear position to low-speed gear position relative to The figure that the position of cam engaging part 180 is illustrated.As shown in Figure 13 (a), incline from cam engaging part 180 with first The state of engaging rises in the end of the oblique cam groove portion 182b side of trailing wheel 16, nut part 140 is surrounded the by motor 84 One axis C1 and rotated to arrow mark F1 directions and make cam engaging part 180 around first axle C1 to arrow When the direction of flag F 1 is rotated, drum cam 182 can along the first tilting cam groove portion 182b with following amount of movement to arrow Labeling head F2 directions are the 3rd axis C3 directions movement of fork shaft 102, and the amount of movement is, more than nut part 140 in arrow Amount of movement on the direction of flag F 2, be more than nut part 140 by the effect of the screw thread between thread spindle part 148 to The amount for the amount of movement that arrow mark F2 directions are moved.That is, Figure 13 (a) is in high speed gear position for expression fork shaft 102 When drum cam 182 position figure, drum cam when Figure 13 (c) is represents that fork shaft 102 is in low-speed gear position The figure of 182 position, Figure 13 (b) is the cydariform during expression fork shaft 102 switches from high speed gear position to low-speed gear position The figure of the position of cam 182.In addition, the circle of the single dotted broken line shown in Figure 13 (b) and (c) represents that Figure 13 (a's) is convex Take turns the position of engaging part 180.

Drum cam 182 relative to cam engaging part 180 position in the same manner as Figure 13 (c) as shown in figure 14, In second switching cam groove portion 182d, cam groove portion 182d the first tilting cam is switched in cam engaging part 180 and second In the state of the end engaging of groove portion 182b sides, even if making nut part 140 i.e. cam engaging part 180 by motor 84 Rotated around the first axle C1 of rear wheel-side output shaft 44 to arrow mark F3 directions, but due to the second switching cam path Portion 182d extends to the direction orthogonal relative to the 3rd axis C3, therefore drum cam 182 also will not be to the 3rd of fork shaft 102 Move in axis C3 directions.That is, cam engaging part 180 with second switching cam groove portion 182d engage in the state of, no matter spiral shell How auxiliary assembly 140 is rotated around the first axle C1 of rear wheel-side output shaft 44, prevent cam engaging part 180 with Relative movement of the drum cam 182 on the 3rd axis C3 directions of fork shaft 102.Therefore, when from cam engaging part 180 and The state of the end engaging of two switching cam groove portion 182d the first tilting cam groove portion 182b sides rises, and is made by motor 84 When cam engaging part 180 is rotated around first axle C1 to arrow mark F3 directions, low-speed gear can be in fork shaft 102 In the state of position, make front-wheel drive with the piston 82 of clutch 50 be never pressed against friction snap-fit element 80 on position to It is pressed against the position movement in friction snap-fit element 80.In addition, in fig. 14, engaging with the second switching cam groove portion 182d Cam engaging part 180 rotated by motor 84 to arrow mark F3 directions in the range of, fork shaft 102 is in At low-speed gear position and front-wheel drive with the piston 82 of clutch 50 be not pressed against friction snap-fit element 80 on cam card The cam that front-wheel drive clutch 50 is discharged when slewing area, the i.e. fork shaft 102 for closing part 180 is in low-speed gear position The slewing area of engaging part 180, is expressed as the first range L 2.In addition, in fig. 14, cam groove portion 182d is being switched with second In the range of the cam engaging part 180 of engaging is rotated by motor 84 to arrow mark F3 directions, by fork shaft 102 Piston 82 in low-speed gear position and front-wheel drive clutch 50 is pressed against the cam card in friction snap-fit element 80 Slewing area, the i.e. fork shaft 102 for closing part 180 is in the cam engaged during low-speed gear position with front-wheel drive clutch 50 The slewing area of engaging part 180, is expressed as the second range L 4.

Position (c) and Figure 14 identical Figure 15 such as with Figure 13 of the drum cam 182 relative to cam engaging part 180 (a) shown in, when from the switching of cam engaging part 180 and second cam groove portion 182d the first tilting cam groove portion 182b sides End, the state engaged with the side of trailing wheel 16 for the end of opposite side i.e. with the first tilting cam groove portion 182b, pass through electricity Motivation 84 and make nut part 140 around first axle C1 and rotated to arrow mark F1 directions and engage cam When part 180 is rotated around first axle C1 to arrow mark F1 directions, drum cam 142 is along the first connection groove section 182f and as shown in Figure 15 (b) to arrow mark F2 directions move.In addition, Figure 15 (a) is in for expression fork shaft 102 The figure of the position of drum cam 182 during low-speed gear position, Figure 15 (b) makes fork shaft 102 from low-speed gear position for expression Rise, further make the drum cam 182 moved to arrow mark F2 directions position figure.As shown in Figure 15 (b), When drum cam 182 makes fork shaft 102 further be moved from low-speed gear position to arrow mark F2 directions, i.e., from setting The state that the retainer 174 (reference picture 11) and the support 40a of transfer gear shell 40 for being placed in fork shaft 102 are abutted rises, further Make drum cam 182 to arrow mark F2 directions move when, due to wait mechanism 144 spring members 162 compressed, Drum cam 182 can be applied with the direction in opposite direction with arrow mark F2 by the elastic restoring force of spring members 162 Force Fa.Therefore, as shown in Figure 15 (b), when the state engaged from cam engaging part 180 with the first connection groove section 182f Rise, made by motor 84 cam engaging part 180 around first axle C1 and to arrow mark F1 directions rotate when, cydariform Cam 182 can be moved by above-mentioned force Fa to the direction in opposite direction with arrow mark F2, so that such as Figure 15 (c) It is shown such, the meeting of cam engaging part 180 and the second tilting cam groove portion 182e the end card with the side opposite side of trailing wheel 16 Close.In addition, the circle of the single dotted broken line shown in Figure 15 (b) and (c) represents the position of Figure 15 (a) cam engaging part 180 Put.

Figure 16 be drum cam 182 when switching to fork shaft 102 from from low-speed gear position to high speed gear position relative to The figure that the position of cam engaging part 180 is illustrated.Drum cam 182 relative to cam engaging part 180 position such as with Shown in Figure 15 (c) identical Figure 16 (a), when from the tilting cam groove portion 182e of cam engaging part 180 and second with after Take turns the state engaged in the end that 16 sides are opposite side to rise, nut part 140 is surrounded first axle by motor 84 C1 is rotated to arrow mark F3 directions, and makes cam engaging part 180 around first axle C1 to arrow mark F3 When direction is rotated, drum cam 182 can along the second tilting cam groove portion 182e with following amount of movement to arrow mark F4 directions are moved, and the amount of movement is, more than nut part 140 in the direction (arrow in opposite direction with arrow mark F2 The direction of flag F 4) on amount of movement, i.e. be more than nut part 140 by the effect of the screw thread between thread spindle part 148 The amount of the amount of movement moved to arrow mark F4 directions.In addition, Figure 16 (a) is in low-speed gear for expression fork shaft 102 The figure of the position of drum cam 182 during position, cydariform when Figure 16 (c) is represents that fork shaft 102 is in high speed gear position The figure of the position of cam 182, during Figure 16 (b) is represents that fork shaft 102 switches from low-speed gear position to high speed gear position The figure of the position of drum cam 182.In addition, the circle of the single dotted broken line shown in Figure 16 (b) and (c) represents Figure 16 (a) Cam engaging part 180 position.

Drum cam 182 relative to cam engaging part 180 position in the same manner as Figure 16 (c) such as Figure 17 (a) institute Show, with the state that the end of the second tilting cam groove portion 182e side of trailing wheel 16 engages, pass through when from cam engaging part 180 Motor 84 and nut part 140 is rotated around first axle C1 to arrow mark F3 directions and is made cam engaging part 180 around first axle C1 to arrow mark F3 directions when rotating, and drum cam 182 is understood along the second connection groove section 182g Moved as shown in Figure 17 (b) to arrow mark F4 directions.In addition, Figure 17 (a) is in height for expression fork shaft 102 The figure of the position of drum cam 182 during fast gear position, Figure 17 (b) makes fork shaft 102 from high speed gear position for expression The figure of the position of the drum cam 182 further moved to arrow mark F4 directions.As shown in Figure 17 (b), work as cydariform When cam 182 makes the fork shaft 102 further be moved from high speed gear position to arrow mark F4 directions, i.e., from fork shaft 102 The state being not allowed to the movement in arrow mark F4 directions rise drum cam 182 is entered to arrow mark F4 directions When row is mobile, due to waiting the spring members 162 of mechanism 144 to be compressed, therefore as shown in Figure 17 institutes (b), in drum cam 182 On the force Fb in the direction in opposite direction with arrow mark F4 can be applied with by the elastic restoring force of spring members 162. Therefore, as shown in Figure 17 (b), when with the state that the second connection groove section 182g engages, passing through electricity from cam engaging part 180 Motivation 84 and make cam engaging part 180 to arrow mark F3 directions rotated when, drum cam 182 can pass through above-mentioned force Fb and moved to the direction in opposite direction with arrow mark F4 so that as Figure 17 (c) shown in, cam engaging part 180 It can engage with the first switching cam groove portion 182c.In addition, the circle of the single dotted broken line shown in Figure 17 (b) and (c) represents Figure 17 (a) cam engaging part 180 position.

In the above described manner and in the transfer gear 178 that constitutes, when surrounding cam engaging part 180 by motor 84 When first axle C1 is rotated, fork shaft 102 is made from high gear by the cam path 182a being formed on drum cam 182 Position is moved to low-speed gear position or moved from low-speed gear position to high speed gear position, and can be in fork shaft 102 Front-wheel drive is adjusted with the transmission torque of clutch 50 in the state of high speed gear position or low-speed gear position Section.

As described above, according to the transfer gear 178 of the present embodiment, in the cam path 182a being formed on drum cam 182, Possess to the 3rd axis C3 relative to fork shaft 102 and the extension of inclined direction and engage with cam engaging part 180 the One tilting cam groove portion 182b and the second switching to the 3rd axis C3 relative to fork shaft 102 and the extension of orthogonal direction are convex Groove portion 182d is taken turns, by the second switching cam groove portion 182d, from regardless of whether how nut part 140 surrounds rear wheel-side output shaft 44 First axle C1 and rotated to arrow mark F3 directions, prevent cam engaging part 180 with drum cam 182 in fork Relative movement on 3rd axis C3 directions of axle 102.Therefore, when cam engaging part 180 and being formed at drum cam 182 Cam path 182a the first tilting cam groove portion 182b engaging in the state of make nut part 140 surround rear wheel-side output shaft 44 First axle C1 and to arrow mark F1 directions rotated when, drum cam 182 can relative to cam engaging part 180 Relatively moved on the 3rd axis C3 directions of fork shaft 102, and the high low speed switching mechanism 48 that for example begins is switched to low speed side Gear stage L.Also, due to being switched in high low speed switching mechanism 48 in the state of low speed side gear stage L, when cam holding section When part 180 engages with cam path 182a the second switching cam groove portion 182d, no matter how defeated around rear wheel-side nut part 14 is The first axle C1 of shaft 44 and rotated to arrow mark F3 directions, prevent cam engaging part 180 and drum cam 182 relative movement on the 3rd axis C3 directions of fork shaft 102, therefore it is switched to low speed side in high low speed switching mechanism 48 In the state of gear stage L, nut part 140 is moved on the first axle C1 directions of rear wheel-side output shaft 44 so as to nut The linear motion of part 140 is passed to front-wheel drive clutch 50 via the first transmission mechanism 88d.Thus, by height Low speed switching mechanism 48 is switched in the state of low speed side gear stage L, can be by front-wheel drive clutch 50 to drive The transmission torque that moving gear 46 is transmitted is adjusted.

In addition, according to the transfer gear 178 of the present embodiment, the end in the first tilting cam groove portion 182b side of trailing wheel 16 Possesses the first switching cam groove portion 182c, in the first tilting cam groove portion 182b end tool with the side opposite side of trailing wheel 16 Standby second switching cam groove portion 182d.Therefore, when by making nut part 140 surround the first axle C1 of rear wheel-side output shaft 44 And rotated, so that the switching cam groove portions of switching cam groove portion 182c or second of cam engaging part 180 and first When 182d engages, high low speed switching mechanism 48 can be switched to high-speed side gear stage H or low speed side gear stage L.Also, In the state of cam engaging part 180 engages with the first switching cam groove portion 182c or the second switching cam groove portion 182d, by Even if in nut part 140 around rear wheel-side output shaft 44 first axle C1 and rotated, but no matter nut part 140 such as What is rotated around the first axle C1 of rear wheel-side output shaft 44, prevents drum cam 182 in the 3rd axle of fork shaft 102 Movement on line C3 directions, therefore, it is possible to which high low speed switching mechanism 48 is being switched into high-speed side gear stage H or low speed side tooth While taking turns level L state, adjusted by the front-wheel drive transmission torque that polar driving gear 46 is transmitted with clutch 50 Section.

Embodiment 4

Figure 18 is the figure illustrated to the transfer gear 184 of the further embodiment of the present invention.The transfer gear of the present embodiment 184 compared with the transfer gear 22 of embodiment 1, is carrying out change this point to the construction of thread mechanism 190 as follows On be it is different, other aspect it is roughly the same with the transfer gear 22 of embodiment 1, the mode is, by using motor 84 Make thread spindle part (screwed part of a side) 186 rotation drivings, so that nut part 188 is the of rear wheel-side output shaft 44 One axis C1 side is moved up.

As shown in figure 18, the oriented side of front-wheel 14 close to thread spindle part 186 is formed on clutch spider hub 76 The teat 76a that the direction of end is protruded, is configured with the between the end of teat 76a and the front wheel side of thread spindle part 186 One thrust bearing 192.In addition, forming the end of the oriented side of trailing wheel 16 close to thread spindle part 186 on transfer gear shell 40 Direction protrude teat 40b, be configured with second between the end of the side of trailing wheel 16 of teat 40b and thread spindle part 186 Thrust bearing 194.In addition, thread spindle part 186 is with can be by way of needle bearing 97 is rotated against by trailing wheel Side output shaft 44 is supported.That is, by the teat 76a and the teat 40b of transfer gear shell 40 of clutch spider hub 76, so that Thread spindle part 186 on the first axle C1 directions of rear wheel-side output shaft 44 can not move and can be by needle roller axle Hold 97 and supported around the mode that the first axle C1 of rear wheel-side output shaft 44 is rotated by rear wheel-side output shaft 44.Separately Outside, on thread spindle part 186, it is formed with forming the worm gear 186a that the worm screw 98 on the motor shaft of motor 84 engages, Drum cam 100 is linked with thread spindle part 186.

In addition, as shown in figure 18, inner circumferential spline tooth 40c, the shape on nut part 188 are formed with transfer gear shell 40 The chimeric periphery spline tooth 188a of Cheng Youyu inner circumferential spline tooth 40c splines.In addition, nut part 188 is via multiple balls 196 And screwed up with thread spindle part 186, thread mechanism 190 is that nut part 188 is with thread spindle part 186 via multiple balls 196 And the ball-screw worked.That is, by the inner circumferential spline tooth 40c of transfer gear shell 40, so that nut part 188 is with can be rear The mode quilt that moves and can not be rotated around first axle C1 on the first axle C1 directions for taking turns side output shaft 44 It is supported on transfer gear shell 40.

Thus, when making thread spindle 186 rotation driving of part by motor 84, nut part 188 can be in rear wheel-side Moved on the first axle C1 directions of output shaft 44, so that the linear motion of nut part 188 is via the first transmission mechanism 88a and be passed to front-wheel drive clutch 50.Also, work as makes the rotation driving of thread spindle part 186 by motor 84 When, the drum cam 100 being attached on thread spindle part 186 can be rotated, so that the cam engaged with cam path 100c Engaging part 103 can be moved on the 3rd axis C3 directions of fork shaft 102, and the straight line fortune of cam engaging part 103 It is dynamic to be passed to high low speed switching mechanism 48 via the second transmission mechanism 88b.

As described above, according to the transfer gear 184 of the present embodiment, nut part 188 is can not surround rear wheel-side output shaft 44 First axle C1 and the mode that is rotated be supported by, thread spindle part 186 is with can not be the first of rear wheel-side output shaft 44 Move and can be propped up around the first axle C1 of rear wheel-side output shaft 44 modes rotated on axis C1 directions Hold.In this way, when making thread spindle 186 rotation driving of part by motor 84, nut part 188 can be defeated in rear wheel-side The linear motion so as to nut part 188 is moved on the first axle C1 directions of shaft 44 via the first transmission mechanism 88a And it is passed to front-wheel drive clutch 50.Also, when making thread spindle 186 rotation driving of part by motor 84, The drum cam 100 being attached on the thread spindle part 186 can be rotated, so that the cam card engaged with cam path 100c Closing part 103 can move to the 3rd axis C3 directions of fork shaft 102, and the linear motion warp of cam engaging part 103 High low speed switching mechanism 48 is passed to by the second transmission mechanism 88e.

Although hereinbefore, being illustrated in detail with reference to the accompanying drawings and to embodiments of the invention, the present invention is at it It can also be applicable in his mode.

For example, although in previously described embodiment, possesses polar driving tooth in transfer gear 22,134,178,184 The front-wheel drive clutch 50 that the transmission torque of the transmission of wheel 46 is adjusted, but it is also possible to instead of front-wheel drive clutch 50 And clutch, the i.e. dog that a part for the power of rear wheel-side output shaft 44 is transmitted or blocked to drive gear 46 is set Clutch (engagement clutch).

In addition, although in previously described embodiment, ball-screw has been illustrated as thread mechanism 86, but do not limited Due to which.As long as such as thread mechanism 86 is is converted to the rotary motion of motor 84 switching mechanism of linear motion i.e. Can, its can also for directly mutually screw up it is simple thread spindle part 94 is combined with nut part 92 as Mechanism.Specifically, thread mechanism 86 can also be slip screw etc..Although in the case of to slide screw, with ball Leading screw is set low compared to the mechanical efficiency for converting rotational motion into linear motion, but can obtain following certain effect Really, i.e. higher thrust can be applied to front-wheel drive clutch 50, or result in the work of high low speed switching mechanism 48 Stroke needed for making.

In addition, although in previously described embodiment, thread mechanism 86 via worm-and-wheel gear 90 indirectly by It is attached on motor 84, but is not limited to which.The nut part 92 of such as thread mechanism 86 also may be used with motor 84 To link not via worm-and-wheel gear 90 but directly.Specifically, nut part 92 can also be so as to set with motor 84 Little gear on the motor shaft of motor 84 is put with forming mode that the gear teeth on nut part 92 is engaged directly to connect Knot.

In addition, although in previously described embodiment, as the vehicle 10 for applying transfer gear 22,134,178,184 And the four-wheel drive vehicle based on FR is illustrated, but it is not limited to this.For example apply transfer gear 22,134,178, 184 vehicle 10 can also be the four-wheel drive vehicle based on driving (FF) by front engine, front.In addition, although front-wheel Driving clutch 50 is the clutch of many plates, even if also can be using the present invention for the clutch of veneer.In addition, transfer gear 22 can also possess gear position maintaining body 120 or low-speed gear position detecting switch 130.

In addition, in previously described embodiment, as drive force source, the engine 12 of example has used such as gasoline The internal combustion engine of engine or Diesel engine etc..In addition, as drive force source, also can be by the others such as motor Engine individually or with engine 12 is applied in combination.In addition, speed changer 20 is planetary gear type multi-stage transmission, stepless change The various automatic transmission of fast device, the parallel twin-shaft transmission of synchro-meshing type (including known DCT) etc., or known hand Dynamic speed changer.In addition, although front side clutch 36 is electromagnetism dog clutch, but is not limited to this.Such as front side clutch Device 36 can also be to possess the selector fork that makes sleeve move in the axial direction and by that can implement electric control or hydraulic control The dog clutch or friction clutch of actuator to be driven this form to the selector fork etc..

In addition, the above is only an embodiment, the present invention can according to the knowledge of those skilled in the art with Various changes, the mode of improvement are applied with to implement.For example, in the above embodiments 1, also can as described in Example 3 that Sample, when fork shaft 102 is in low-speed gear position, makes the outer peripheral teeth 70a of locking sleeve 70 not engaged with locking tooth 68, and will The cam path 100c of drum cam 100 is set to the cam path 182a of the shape as drum cam 182.

Symbol description

22、134、178、184：Transfer gear；42：Input shaft；44：Rear wheel-side output shaft (output shaft)；46：Drive gear (output block)；48：High low speed switching mechanism；50：Front-wheel drive is with clutch (clutch)；73：(the output of second bearing support Shaft support bearing)；84：Motor (actuator)；94、148：Thread spindle part；92、140：Nut part (the threaded portion of a side Part)；86、138、190：Thread mechanism；88a、88d：First transmission mechanism (the first transmission mechanism)；88b、88e：Second transmission machine Structure (the second transmission mechanism)；96、152：Ball；100、142、182：Drum cam；100c、142a、182a：Cam path；100d、 142b：Tilting cam groove portion；100e、142c：First cam groove portion (switching cam groove portion)；102：Fork shaft (the second axle)；103、 136、180：Cam engaging part；106：Wait mechanism；112：Spring members；146：Worm-and-wheel gear；146a：Worm gear； 182b：First tilting cam groove portion (tilting cam groove portion)；182c：First switching cam groove portion (switching cam groove portion)；182d： Second switching cam groove portion (switching cam groove portion)；182e：Second tilting cam groove portion (tilting cam groove portion)；186：Thread spindle Part (screwed part of a side)；188：Nut part；C1：First axle (axle center)；C3：3rd axis (axle center)；D：It is mobile Amount；H：High-speed side gear stage；L：Low speed side gear stage.

Claims

1. a kind of transfer gear, including：

Input shaft；

Output shaft；

Output block, it is configured to, and power is exported to the output target different from the output shaft；

High low speed switching mechanism, it is configured to, and is transmitted the rotation speed change of the input shaft and to the output shaft, and The high low speed switching mechanism includes high-speed side gear stage and low speed side gear stage；

Clutch, it is configured to, and by a part for the power of the output shaft, from the output, axially the output block is passed Pass or block or to being adjusted from the output transmission torque that axially output block is transmitted；

Actuator；

Thread mechanism, it includes the thread spindle part and nut part as a pair of screwed parts, the thread spindle part with And the nut part is mutually screwed up, the thread mechanism is configured to, and makes the thread spindle part by the actuator And the screwed part of any one party in nut part surrounds the axle center rotation driving of the output shaft, so that described Nut part is moved on the axis direction of the output shaft；

First transmission mechanism, it is configured to, by movement of the nut part on the axis direction of the output shaft to institute Clutch is stated to be transmitted；

Second transmission mechanism, it includes the second axle abreast configured with the output shaft, and second axle is configured to, in institute Moved on the axis direction for stating the second axle；

Cam engaging part, it is attached at any one party in the screwed part of one and second axle On；

Drum cam, it is attached on the opposing party in the screwed part of one and second axle, and bag The cam path engaged with the cam engaging part is included, the drum cam is configured to, and passes through the screwed part of one The axle center around the output shaft rotation so as on the axis direction of second axle relative to the cam holding section Part is relatively moved,

The cam engaging part and the drum cam that second transmission mechanism will be attached on second axle In movement of the side on the axis direction of second axle enter via second axle to the high low speed switching mechanism Row transmission, so that the high low speed switching mechanism is switched into high-speed side gear stage and low speed side gear stage.

2. transfer gear as claimed in claim 1, wherein,

The cam path of the drum cam includes tilting cam groove portion and switching cam groove portion,

The tilting cam groove portion is to the axle center relative to the output shaft or the axle center of second axle and inclined direction Extension,

The switching cam groove portion is to the axle center relative to the output shaft or the axle center of second axle and orthogonal direction Extension,

The switching cam groove portion is configured to, and no matter how the screwed part of one enters around the axle center of the output shaft Row is rotated, and prevents the cam engaging part described relative on the axis direction of second axle with the drum cam It is mobile.

3. transfer gear as claimed in claim 2, wherein,

The switching cam groove portion includes the first switching cam groove portion and the second switching cam groove portion,

The first switching cam groove portion is arranged on the end of a side of the tilting cam groove portion,

The second switching cam groove portion is arranged on the end of the opposing party of the tilting cam groove portion.

4. the transfer gear as described in any one in claims 1 to 3, wherein,

The tilting cam groove portion is configured to, and the screwed part of one is made by the actuator around described defeated When the axle center of shaft is rotated, make the drum cam with the nut part on the axis direction of the output shaft Amount of movement compare and larger amount of movement and carried out relative to the cam engaging part on the axis direction of second axle Relative movement.

5. the transfer gear as described in any one in Claims 1-4, wherein

The cam engaging part is attached on second axle,

The drum cam is attached on the screwed part of one.

6. transfer gear as claimed in claim 5, wherein,

The drum cam is attached on the nut part,

The nut part is supported by the way of it can be rotated around the axle center of the output shaft,

The thread spindle part on the axis direction of the output shaft can not move and can not surround described defeated The mode that the axle center of shaft is rotated is supported by.

7. transfer gear as claimed in claim 5, wherein,

The drum cam is attached on the thread spindle part,

The nut part is supported by the way of it can not be rotated around the axle center of the output shaft,

The thread spindle part on the axis direction of the output shaft can not move and can surround the output The mode that the axle center of axle is rotated is supported by.

8. the transfer gear as described in any one in claim 5 to 7, wherein,

What the end of the drum cam side in the both ends of the output shaft was supported in the way of it can rotate is defeated Go out shaft support bearing, the drum is configured in the length range on the axis direction of the output shaft of the drum cam The inner side of shape cam.

9. the transfer gear as described in any one in Claims 1-4, wherein,

The actuator is attached at via worm-and-wheel gear on the nut part of the thread mechanism,

The cam engaging part is attached on the worm gear of the worm-and-wheel gear,

The drum cam is attached on second axle,

The drum cam is the part-cylindrical shape along the periphery of the worm gear.

10. the transfer gear as described in any one in claim 1 to 9, wherein,

Second transmission mechanism includes waiting mechanism, and the wait mechanism is via spring members by the cam engaging part The movement of movement or the drum cam on the axis direction of the output shaft on the axis direction of the output shaft Transmitted to second axle.

11. the transfer gear as described in any one in claim 1 to 10, wherein,

The nut part is screwed up via multiple balls with the thread spindle part.

12. the transfer gear as described in any one in claim 1 to 11, wherein,

The clutch is any one party in veneer clutch and multi-plate clutch,

The clutch is configured to, and the transmission torque transmitted to the output block is adjusted.