CN206017618U

CN206017618U - A kind of three shift transmissions

Info

Publication number: CN206017618U
Application number: CN201620853394.XU
Authority: CN
Inventors: 高翔; 黄儒明
Original assignee: CHONGQING CHUANYU JINGGONG MECHANICAL ACCESSORIES DEVELOPMENT Co Ltd
Current assignee: CHONGQING CHUANYU JINGGONG MECHANICAL ACCESSORIES DEVELOPMENT Co Ltd
Priority date: 2016-08-08
Filing date: 2016-08-08
Publication date: 2017-03-15
Anticipated expiration: 2026-08-08

Abstract

A kind of three shift transmissions, which includes that casing, the first power transmission shaft, second driving shaft, engagement device and differential mechanism, the first power transmission shaft, second driving shaft and differential mechanism are respectively arranged in casing, the first power transmission shaft and second driving shaft interval setting；First driving sleeve is provided with first gear, second gear and the 7th gear, second driving shaft is arranged with the 4th gear and the eighth gear engaged with the 7th gear that the 3rd gear engaged with first gear is engaged with second gear, and second driving shaft is provided with the 5th gear coordinated with differential mechanism；Engagement device includes the second engagement device for being arranged at the first power transmission shaft and the first engagement device for being arranged at second driving shaft.Power is transmitted separately to two wheels by two semiaxis by differential mechanism, and variator is only with two axles and seven gears, its simple structure, small volume.

Description

A kind of three shift transmissions

Technical field

This utility model is related to variator field, in particular to a kind of three shift transmission.

Background technology

The rotating speed of electromotor and change in torque scope are less, and complicated use condition needs driving force and the speed of electromotor Can change in the larger context, this needs arranges variator in drive system.

Variator is the mechanism for changing rotating speed from electromotor and torque, and it can change output shaft and input shaft Gear ratio, variator are also called change speed gear box.Variator is made up of variable transmission mechanism and operating mechanism.

Variator is acted on：First, change gear ratio, increase the excursion of drive wheel torque and rotating speed, when driven When relation between the number of teeth of gear and the number of teeth of driving gear changes, ratio changing is constant in engine speed In the case of, the rotating speed of output shaft changes, i.e., the rotating speed of wheel changes, a pair of pitch wheels, and in use, the number of teeth will not become Change, therefore its gear ratio is changeless, equipped with the gear that multiple numbers of teeth are different on input shaft, equipped with right on output shaft Answer the gear of the number of teeth, it is possible to obtain the different variator of one group of gear ratio.Second, it is possible to use neutral interrupts the power of electromotor Transmission, so that electromotor starting, idle running, and variator can be shifted gears.Variator is the important of drive system Device, rational design can make full use of the power and moment of torsion of electromotor and also can reduce oil consumption.Existing variator The disadvantage is that, complex structure and volume is larger.

Utility model content

The purpose of this utility model is to provide a kind of three shift transmission, its simple structure and small volume.

Embodiment of the present utility model is realized in：

A kind of three shift transmissions, which includes casing, the first power transmission shaft, second driving shaft, engagement device and differential mechanism, the One power transmission shaft, second driving shaft and differential mechanism are respectively arranged in casing, the first power transmission shaft and second driving shaft interval setting；The One driving sleeve is provided with first gear, second gear and the 7th gear, and second driving shaft is arranged with and is engaged with first gear The 4th gear and the eighth gear engaged with the 7th gear that 3rd gear is engaged with second gear, second driving shaft are arranged There is the 5th gear coordinated with differential mechanism；Engagement device includes the second engagement device for being arranged at the first power transmission shaft and is arranged at First engagement device of second driving shaft.

In this utility model preferred embodiment, the first gear of above-mentioned three shift transmission and the gear ratio of the 3rd gear For the first gear ratio, second gear is the second gear ratio with the gear ratio of the 4th gear, and the first gear ratio is more than the second gear ratio.

In this utility model preferred embodiment, the 7th gear of above-mentioned three shift transmission and the gear ratio of eighth gear For the 3rd gear ratio, the 3rd gear ratio is less than the second gear ratio.

In this utility model preferred embodiment, the differential mechanism of above-mentioned three shift transmission includes the 6th gear, the 6th tooth Wheel is engaged with the 5th gear.

In this utility model preferred embodiment, the reference diameter of the 6th gear of above-mentioned three shift transmission is more than the The reference diameter of five gears.

In this utility model preferred embodiment, the differential mechanism of above-mentioned three shift transmission includes differential carrier and setting Planetary gear in differential carrier.

In this utility model preferred embodiment, the differential mechanism of above-mentioned three shift transmission is connected to two semiaxis.

In this utility model preferred embodiment, the second driving shaft of above-mentioned three shift transmission is splined shaft, the 5th tooth Wheel is sheathed on second driving shaft and the rotation of the 5th gear is synchronous with the rotation of second driving shaft.

In this utility model preferred embodiment, the two ends of the first power transmission shaft of above-mentioned three shift transmission, the second transmission The two ends of the two ends of axle and differential mechanism are connected to casing by bearing respectively.

In this utility model preferred embodiment, three shift transmissions of above-mentioned three shift transmission also include manipulation device, The second manipulation that manipulation device is included the first manipulation device coordinated with the first engagement device and coordinated with the second engagement device Device, the first manipulation device include the first selector fork and are connected to the first shift fork axle of the first selector fork, and second manipulates Device includes the second selector fork and is connected to the second shift fork axle of the second selector fork.

The beneficial effect of this utility model embodiment is：First power transmission shaft 110 of three shift transmission 100 of the present utility model Only it is provided with three gears, second driving shaft 120 and is provided with four gears, the width of three shift transmissions 100 is the first power transmission shaft 110 or the distance of second driving shaft 120；As three rows lined up by the first power transmission shaft 110, second driving shaft 120 and differential mechanism 150, The length of three shift transmissions 100 is i.e. from the first power transmission shaft 110 to the distance of differential mechanism 150.So as to three shift transmissions 100 are only adopted With two axles and seven gears, its simple structure, small volume.

Description of the drawings

In order to be illustrated more clearly that the technical scheme of this utility model embodiment, below will be to using needed for embodiment Accompanying drawing be briefly described, it will be appreciated that the following drawings illustrate only some embodiments of the present utility model, therefore should be by Regard the restriction to scope as, for those of ordinary skill in the art, on the premise of not paying creative work, may be used also To obtain other related accompanying drawings according to these accompanying drawings.

Fig. 1 is the schematic side view of three shift transmission of the present utility model；

Profiles of the Fig. 2 for Fig. 1 A-A along the line；

Partial views of the Fig. 3 for the profile of Fig. 2 B-B along the line；

Fig. 4 is the partial view of the profile of Fig. 3 C-C along the line；

Fig. 5 is the schematic perspective view of three shift transmission of the present utility model；

Fig. 6 is another schematic perspective view of three shift transmission of the present utility model.

In figure：

Three shift transmissions 100, the first power transmission shaft 110, first gear 111, second gear 112, the 7th gear 117, second Power transmission shaft 120, the 3rd gear 123, the 4th gear 124, the 5th gear 125, eighth gear 128, casing 130, engagement device 140, the first engagement device 143, first clutch 141, the first clutch cover 142, the second engagement device 144, second clutch 145, the second clutch cover 146, differential mechanism 150, differential shell 153, planetary gear 152, axle shaft gear 154, the 6th gear 156, behaviour Vertical device 160, the first manipulation device 165, the first selector fork 161, the first shift fork axle 162, the second manipulation device 166, second Selector fork 163, the second shift fork axle 164.

Specific embodiment

Purpose, technical scheme and advantage for making this utility model embodiment is clearer, new below in conjunction with this practicality Accompanying drawing in type embodiment, is clearly and completely described to the technical scheme in this utility model embodiment, it is clear that retouched The embodiment that states is a part of embodiment of this utility model, rather than whole embodiments.Generally described in accompanying drawing herein and The component of this utility model embodiment for illustrating can be arranged and be designed with a variety of configurations.

Therefore, requirement is not intended to limit to the detailed description of the embodiment of the present utility model for providing in the accompanying drawings below The scope of the present utility model of protection, but it is merely representative of selected embodiment of the present utility model.In based on this utility model Embodiment, the every other embodiment obtained under the premise of creative work is not made by those of ordinary skill in the art, all Belong to the scope of this utility model protection.

It should be noted that：Similar label and letter represent similar terms in following accompanying drawing, therefore, once a certain Xiang Yi It is defined in individual accompanying drawing, then in subsequent accompanying drawing which further need not be defined and be explained.

In description of the present utility model, it should be noted that term " " center ", " on ", D score, "left", "right", " perpendicular Directly ", the orientation of instruction such as " level ", " interior ", " outward " or position relationship be based on orientation shown in the drawings or position relationship, or The utility model product using when the orientation usually put or position relationship, be for only for ease of description this utility model and letter Change description, rather than indicate or the device or element of hint indication must have specific orientation, with specific azimuth configuration and Manipulate, therefore it is not intended that to restriction of the present utility model.Additionally, term " first ", " second ", " the 3rd " etc. are only used for area Divide description, and it is not intended that indicating or hint relative importance.

In description of the present utility model, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " sets Put ", should be interpreted broadly " installation ", " connection ", for example, it may be fixedly connected, or be detachably connected, or integratedly Connection；Can be mechanically connected, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition Concrete meaning of the language in this utility model.

First embodiment

Fig. 1 to Fig. 6 is refer to, the present embodiment provides a kind of three shift transmission 100, and which includes casing 130, the first power transmission shaft 110th, second driving shaft 120 and engagement device 140,120 interval setting of the first power transmission shaft 110 and second driving shaft, first passes Moving axis 110 and second driving shaft 120 are respectively arranged at casing 130, are provided with first gear 111, second on the first power transmission shaft 110 Gear 112 and the 7th gear 117, are provided with the 3rd gear 123, the 4th gear 124 and eighth gear on second driving shaft 120 128, second driving shaft 120 is additionally provided with the 5th gear 125 coordinated with differential mechanism 150, and engagement device 140 includes being arranged at the First engagement device 143 of one power transmission shaft 110 and it is arranged at the second engagement device 144 of second driving shaft 120.

First power transmission shaft 110 is input shaft, and the two ends of the first power transmission shaft 110 are respectively by two bearing (not shown) connections To casing 130.First gear 111, second gear 112 and the 7th gear 117, second gear is provided with first power transmission shaft 110 112 are located between first gear 111 and the 7th gear 117, and first gear 111 and second gear 112 are with the first power transmission shaft 110 1 Rise and rotate.

The two ends of second driving shaft 120 are connected to casing 130 by two bearing (not shown) respectively.Second driving shaft 120 are provided with the 3rd gear 123, the 4th gear 124 and eighth gear 128, and the 3rd gear 123 is engaged with first gear 111, the Four gears 124 are engaged with second gear 112, the 3rd gear 123 and the three or four gear interval setting；Eighth gear 128 and the 7th Gear 117 is engaged.Second driving shaft 120 is splined shaft.The 5th gear 125, the 5th gear is additionally provided with second driving shaft 120 125 sides for being arranged at the 4th gear 124, the 5th gear 125 and 120 synchronous axial system of second driving shaft.

Engagement device 140 includes that the first engagement device 143 and the second engagement device 144, the first engagement device 143 are arranged at Second driving shaft 120, the second engagement device 144 are arranged at the first power transmission shaft 110.Specifically, the side of the 7th gear 117 is Two gears 112, the opposite side of the 7th gear 117 are provided with the second engagement device 144, and the first engagement device 143 is arranged at the 3rd Between gear 123 and the 4th gear 124.It should be understood that engagement device 140 can be lock unit.Lock unit is that one kind has been installed additional together The clutch collar gearshift of step device, the effect of synchronizer are the impacts for making variator that soldered tooth not occur in gearshift, with Step device can be constant load synchronizer, inertial type of synchronizer or voluntarily boosting-type lock unit, and lock unit can also be clutch collar Or other types of attachment means.

First engagement device 143 include the first clutch 141 being sheathed on second driving shaft 120 and with the first clutch The first clutch cover 142 that device 141 coordinates, the first clutch cover 142 can slide axially on first clutch 141.First clutch There is device 141 internal spline, the 3rd gear 123 and the 4th gear 124 to be respectively provided with the external splines coordinated with inner flower-key, when first from When the external splines of clutch 141 and the 3rd gear 123 coordinates, the 3rd gear 123 and 120 synchronous axial system of second driving shaft, when first When the external splines of clutch 141 and the 4th gear 124 coordinates, the 4th gear 124 and 120 synchronous axial system of second driving shaft.

Second engagement device 144 include the second clutch 145 being sheathed on the first power transmission shaft 110 and with the second clutch The second clutch cover 146 that device 145 coordinates, the second clutch cover 146 can slide axially on second clutch 145.Second clutch Device 145 has internal spline, and the 7th gear 117 has the external splines coordinated with inner flower-key, when second clutch 145 and the 7th gear When 117 external splines coordinates, 110 synchronous axial system of the 7th gear 117 and the first power transmission shaft.

Vehicle path of wheel when turning round is circular arc, if vehicle is turned to the left, the central point of circular arc in left side, in phase In the same time, the camber line that right-hand wheel is walked is longer than left-hand wheel, slow it is necessary to left side wheel in order to balance this difference, The right wheel is quicker, can make two wheels that two semiaxis drive that can there is different turning respectively by differential mechanism 150 Speed is making up the difference of distance.

Differential mechanism 150 includes that the 6th gear 156, the 6th gear 156 are engaged with the 5th gear 125, and the 5th gear 125 is by The rotation of two power transmission shafts 120 is transferred to the 6th gear 156, and the 6th gear 156 drives differential mechanism 150, differential mechanism 150 to include differential 150 shell of device and the planetary gear 152 of 150 shell of differential mechanism is arranged at, differential mechanism 150 is provided with axle shaft gear 154, axle shaft gear 154 are connected to two semiaxis, are exported the rotation of the 6th gear 156 to two wheels respectively by two semiaxis respectively.So as to, The input of variator is transmitted separately to two wheels by two semiaxis.

Differential mechanism 150 also includes differential shell 153 and the planetary gear 152 being arranged in differential shell 153, planetary gear 152 Rotation and revolution the wheel that two semiaxis drive can be allowed to have speed difference.The power of electromotor is through the first transmission Axle 110 is transferred to second driving shaft 120, then by the 125 incoming differential mechanism 150 of the 5th gear of second driving shaft 120.Work as vehicle During straight trip, left and right wheel is equal with the rotating speed of planetary wheel carrier three in poised state, three's poised state when automobile turning Destroyed, cause inner side wheel speed to reduce, outside wheel speed increases.

First power transmission shaft 110 is connected with electromotor, and electromotor outputs power to the first power transmission shaft 110, the first power transmission shaft 110 are transmitted power to second driving shaft 120 by first gear 111, second gear 112 and the 7th gear 117, the second transmission By power transmission to differential mechanism 150, power is transmitted separately to two wheels by two semiaxis to axle 120 by differential mechanism 150 again, from And variator outputs power to wheel and driving moment is rotated.

One end of first power transmission shaft 110 is connected to the output of electromotor, and the other end of the first power transmission shaft 110 is by bearing In the dead eye for holding, bearing is installed on casing 130.First gear 111 and second gear 112 are made with the first power transmission shaft 110 respectively Integral, 110 synchronous axial system of first gear 111 and second gear 112 and the first power transmission shaft, first gear 111 and the 3rd gear 123 constitute constant mesh gear pairs, second gear 112 and the 4th gear 124 composition constant mesh gear pair, the 7th gear 117 and the Octadentate wheel 128 constitutes constant mesh gear pair.5th gear 125 is formed integrally with second driving shaft 120, the 5th gear 125 and Two power transmission shafts, 120 synchronous axial system.3rd gear 123 and the 4th gear 124 are press-fitted on second driving shaft 120, second driving shaft 120 two ends are respectively supported in dead eye, and the 3rd gear 123, the 4th gear 124 and eighth gear 128 are driven tooth respectively Wheel, on the first power transmission shaft 110, the 3rd gear 123, the 4th gear 124 distinguishes empty set in the second transmission to 117 empty set of the 7th gear On axle 120, eighth gear 128 is with 120 synchronous axial system of second driving shaft.

Three shift transmissions 100 also include that manipulation device 160, manipulation device 160 include being connected to the first engagement device 143 First manipulation device 165 and the second manipulation device 166 of the second engagement device 144 is connected to, the first manipulation device 165 includes Gear lever (not shown), the first selector fork 161, the first shift fork axle 162, the second manipulation device 166 includes gear lever, and (figure is not Show), the second selector fork 163, the second shift fork axle 164.It should be understood that manipulation device 160 is additionally provided with self-locking device (not shown) With interlock (not shown).

The two ends of the first shift fork axle 162 are supported in the respective aperture of casing 130, and the first shift fork axle 162 can be with axle To slip, one end of shift fork is fixed in the first shift fork axle 162, and the other end of shift fork is connected to first clutch 141.The The two ends of two shift fork axles 164 are supported in the respective aperture of casing 130 respectively, and the second shift fork axle 164 can slide axially, and are dialled One end of fork is fixed on the second shift fork axle 164 and the other end of shift fork is connected to second clutch 145.

When mobile gear lever is shifted gears, the shift fork of the first manipulation device 165 drives first clutch 141 and second driving shaft The external splines of 120 the 3rd gear 123 coordinates, or shift fork drives the 4th tooth of first clutch 141 and second driving shaft 120 The external splines of wheel 124 coordinates, or first clutch 141 is in an intermediate position does not coordinate with the 3rd gear 123 also not with the Four gears 124 coordinate.The shift fork of the second manipulation device 166 drives second clutch 145 and the 7th gear on the first power transmission shaft 117 external splines coordinates, or the shift fork of the second manipulation device 166 drives second clutch 145 to depart from the outer of the 7th gear 117 Spline.

First clutch cover 142 can slide axially on first clutch 141, the second clutch cover 146 can second from Slide axially in clutch 145.When the first engagement device 143 and the second engagement device 144 are simultaneously in neutral gear position, three gears become Fast device 100 is in neutral gear position, and first clutch 141 is not coordinated with the 3rd gear 123 and also do not coordinated with the 4th gear 124, When the first power transmission shaft of engine driving 110 rotates, the first power transmission shaft 110 drives the 3rd gear 123 to revolve by first gear 111 Turn, and the first power transmission shaft 110 drives the 4th gear 124 to rotate by second gear 112, due to the 3rd gear 123 and the 4th Gear 124 is driven gear, and the 3rd gear 123 and the 4th gear 124 are passed second with the rotation of the first power transmission shaft 110 respectively Dally on moving axis 120, therefore second driving shaft 120 can not be driven.

When the external splines of first clutch 141 and the 3rd gear 123 coordinates, the 3rd gear 123 and second driving shaft 120 Synchronous axial system, power are transferred to the 3rd gear 123 from the first power transmission shaft 110 by first gear 111, then pass through second driving shaft 120 the 5th gear 125 transfers a torque to differential mechanism 150, and differential mechanism 150, by two semiaxis, moment of torsion is transferred to two respectively Individual wheel.Now, the gear of three shift transmissions 100 is in bottom gear.

When the first engagement device 143 is in neutral gear position, second clutch 145 and the 7th gear 117 coordinate, the 7th Gear 117 is engaged with eighth gear 128, eighth gear 128 and 120 synchronous axial system of second driving shaft, and power is from the first power transmission shaft 110 are transferred to second driving shaft 120 by the 7th gear 117, then by the 5th gear 125 of second driving shaft 120 by moment of torsion Differential mechanism 150 is transferred to, moment of torsion is driven to two wheels respectively by two semiaxis again for differential mechanism 150.Now, three gear speed change The gear of device 100 is in top gear.

When the external splines of first clutch 141 and the 3rd gear 123 coordinates, the 3rd gear 123 drives second driving shaft 120 rotate, and the 5th gear 125 being formed integrally with second driving shaft 120 rotated, so as to the 5th gear 125 is by second driving shaft 120 moment of torsion is transferred to differential mechanism 150.When the external splines of first clutch 141 and the 4th gear 124 coordinates, the 4th gear 124 drive second driving shafts 120 are rotated, and the 5th gear 125 being formed integrally with second driving shaft 120 is rotated, so as to the 5th tooth The moment of torsion of second driving shaft 120 is transferred to differential mechanism 150 by wheel 125, and moment of torsion is transferred to by differential mechanism 150 again by two semiaxis Vehicle.Now, the gear of three shift transmissions 100 is in middle apron.

When external splines of the first clutch 141 in neutral gear position, second clutch 145 and the 7th gear 117 coordinates, the One power transmission shaft 110 drives the 7th gear 117 to rotate, and the moment of torsion of the first power transmission shaft 110 is by the 7th gear 117 and eighth gear 128 are transferred to second driving shaft 120, so as to the moment of torsion of second driving shaft 120 is transferred to differential mechanism 150 by the 5th gear 125.This When, the gear of three shift transmissions 100 is in top gear.

The gear ratio of first gear 111 and the 3rd gear 123 is referred to as the first gear ratio, second gear 112 and the 4th gear Gear ratio referred to as the 3rd gear ratio of 124 gear ratio referred to as the second gear ratio, the 7th gear 117 and eighth gear 128, first Gear ratio is more than the second gear ratio, and the second gear ratio is more than the 3rd gear ratio.The reference diameter of first gear 111 is far smaller than The reference diameter of the 3rd gear 123, the reference diameter of second gear 112 are close to the reference diameter of the 4th gear 124, the The reference diameter of seven gears, 117 gear is close to the reference diameter of eighth gear 128.Become so as to the first gear ratio forms three gears The bottom gear of fast device 100, the second gear ratio form the middle apron of three shift transmissions 100, and the 3rd gear ratio forms three shift transmissions 100 top gear.It should be understood that the first gear ratio can be transmitted to the moment of torsion of three shift transmissions 100 with increasing electromotor more than one； Second gear ratio and the 3rd gear ratio can be equal to one respectively or increase the rotating speed raising of the output of three shift transmission 100 more than one, Second gear ratio or the 3rd gear ratio are respectively equal to the gear for the moment and are referred to as direct gear, and the second gear ratio or the 3rd gear ratio are less than The gear is referred to as overgear for the moment, if second gear ratio or the 3rd gear ratio can be less than one when engine power is higher, surpasses Speed gear is mainly used in the occasion that in good road surface underloading or empty wagons drive, and the rotating speed of wheel is larger improving speed and improve The fuel economy of vehicle.

As the first power transmission shaft 110 is only provided with three gears, i.e. first gear 111, second gear 112 and the 7th gear 117, second driving shaft 120 is provided with four gears, i.e. the 3rd gear 123, the 4th gear 124, the 5th gear 125 and octadentate Wheel 128, the width of three shift transmissions 100 are the distance of the first power transmission shaft 110 or second driving shaft 120.Due to three shift transmissions Three rows lined up by 100 the first power transmission shaft 110, second driving shaft 120 and differential mechanism 150, and the length of three shift transmissions 100 is i.e. from Distance of one power transmission shaft 110 to differential mechanism 150.In the present embodiment, three shift transmissions 100 are only with two axles and five teeth Wheel, its small volume.

In order to reduce parts depreciation and the power attenuation that internal friction causes, three shift transmissions 100 are additionally provided with lubricating system (not shown), injects lubricating oil, the work for lubricating each gear pair, axle and bearing using splash lubrication mode in casing 130 Surface.So as to there is bleeder plug, fuel head to pass through oil filler control for the bottom that the side of casing 130 has oil filler, casing 130 System.In first gear 111, second gear 112, the 3rd gear 123, the 4th gear 124, the 5th gear 125, the 7th gear 117 Radial direction oil hole is had with eighth gear 128, so as to the bearing at lubrication place position.

In order to prevent lubricating oil from injecting other parts from the gap between the first power transmission shaft 110 and bearing cap, can be in axle Hold in lid and oil-sealing arrangement is installed, oil-recovery tank is provided with bearing cap endoporus, can prevent oil leak.Can be in the first power transmission shaft 110 Two bearings oil-sealing arrangements are set, and oil-sealing arrangements can be set in the two of second driving shaft 120 bearings.Can be each Load gasket seal between individual bearing cap, bonnet, upper lid, the faying face of front and rear housings, and apply fluid sealant, in case leak-stopping is oily.In order to When preventing transmission duty due to oil temperature, pressure rise and cause the seepage of lubricating oil, courage plug can be installed on bearing cap.

It should be understood that first gear 111, second gear 112, the 3rd gear 123, the 4th gear 124 and the 5th gear 125, 7th gear 117 and eighth gear 128 can be straight-tooth gear or angular gear respectively, when three shift transmission 100 is using same When step device and engagement gearbox, travelling gear can be made the helical gear of engagement, such that it is able to reduce during transmission duty Noise, and the size of variator can be reduced, the service life of gear can also be improved.

In sum, the first power transmission shaft 110 of three shift transmission 100 of the present utility model be only provided with three gears, Two power transmission shafts 120 are provided with four gears, and the width of three shift transmissions 100 is the first power transmission shaft 110 or second driving shaft 120 Distance；As three rows lined up by the first power transmission shaft 110, second driving shaft 120 and differential mechanism 150, the length of three shift transmissions 100 is From the first power transmission shaft 110 to the distance of differential mechanism 150.So as to, three shift transmissions 100 are only with two axles and seven gears, its Simple structure, small volume.

Preferred embodiment of the present utility model is the foregoing is only, this utility model is not limited to, for this For the technical staff in field, this utility model can have various modifications and variations.All of the present utility model spirit and principle Within, any modification, equivalent substitution and improvements that is made etc. are should be included within protection domain of the present utility model.

Claims

1. a kind of three shift transmission, it is characterised in that it include casing, the first power transmission shaft, second driving shaft, engagement device and Differential mechanism, first power transmission shaft, the second driving shaft and the differential mechanism are respectively arranged in the casing, and described first Power transmission shaft and the second driving shaft interval setting；First driving sleeve is provided with first gear, second gear and the 7th Gear, the second driving shaft are arranged with that the 3rd gear engaged with the first gear is engaged with the second gear Four gears and the eighth gear engaged with the 7th gear, the second driving shaft are provided with and differential mechanism cooperation 5th gear；The engagement device includes being arranged at the second engagement device of first power transmission shaft and is arranged at described second First engagement device of power transmission shaft.

2. three shift transmission according to claim 1, it is characterised in that the biography of the first gear and the 3rd gear Dynamic ratio is the first gear ratio, and the second gear is the second gear ratio with the gear ratio of the 4th gear, first transmission Than being more than second gear ratio.

3. three shift transmission according to claim 2, it is characterised in that the biography of the 7th gear and the eighth gear Dynamic ratio is the 3rd gear ratio, and the 3rd gear ratio is less than second gear ratio.

4. three shift transmission according to claim 1, it is characterised in that the differential mechanism includes the 6th gear, described Six gears are engaged with the 5th gear.

5. three shift transmission according to claim 4, it is characterised in that the reference diameter of the 6th gear is more than institute State the reference diameter of the 5th gear.

6. three shift transmission according to claim 4, it is characterised in that the differential mechanism includes differential carrier and setting Planetary gear in differential carrier.

7. three shift transmission according to claim 4, it is characterised in that the differential mechanism is connected to two semiaxis.

8. three shift transmission according to claim 1, it is characterised in that the second driving shaft is splined shaft, described Five geared sleeves are synchronous with the rotation of the second driving shaft located at the rotation of the second driving shaft and the 5th gear.

9. three shift transmission according to claim 1, it is characterised in that two ends of first power transmission shaft, described second The two ends of the two ends of power transmission shaft and the differential mechanism are connected to the casing by bearing respectively.

10. three shift transmission according to claim 1, it is characterised in that three shift transmission also includes manipulation device, The manipulation device is included the first manipulation device coordinated with first engagement device and is matched somebody with somebody with second engagement device The second manipulation device for closing, first manipulation device include the first selector fork and are connected to first selector fork First shift fork axle, the second manipulation device include the second selector fork and are connected to the second shift fork of second selector fork Axle.