CN100491716C

CN100491716C - Engine staring apparatus

Info

Publication number: CN100491716C
Application number: CNB2003101161182A
Authority: CN
Inventors: 马场秀和
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2003-06-11
Filing date: 2003-11-14
Publication date: 2009-05-27
Anticipated expiration: 2023-11-14
Also published as: JP2005002860A; KR20040106195A; JP4161070B2; CN1573084A; KR100633218B1

Abstract

Provided is an engine starting system for elongating the service life. A sun gear 17 is fixed to a rotatable motor shaft 3. A plurality of planetary gears 19 capable of revolving by rotation of the motor shaft 3 is disposed around the sun gear 17. A reduction gear shaft rotated by the revolution of each planetary gear 19 is installed to a tip part 9 of the motor shaft 3 through a bearing 11. An inner part 31 rotating integrally with the reduction gear shaft 10 is fixed to the reduction gear shaft 10. An output shaft 23 is installed to a tip part of the reduction gear shaft 10 through a bearing 24. The output shaft 23 has an outer part 29 disposed around the inner part 31. A plurality of sprags for transmitting the rotation of the reduction gear shaft 10 to the output shaft 23 are disposed between the inner part 31 and the outer part 29.

Description

Engine starting gear

Technical field

The present invention relates to starting arrangement such as the motor that is used to start-up a car etc.

Background technique

In traditional engine starting gear, the rotation of motor shaft is passed to clutch by having a plurality of planetary planetary speed reducers.Each planetary pinion can be around the motor shaft revolution by the rotation of motor shaft.The output shaft of clutch is by the supporting of each planetary pinion, and by each planetary revolution driven rotary (such as reference Japanese documentation 1: the spy opens communique 2001-No. 99197).

In above-mentioned traditional engine starting gear, because the output shaft of clutch is by each planetary running shaft supporting, so the axis of the output shaft of clutch is easy and the axis generation deviation of motor shaft.That is the easy and motor shaft generation off-centre of the output shaft of clutch.This off-centre makes clutch have the danger of shortening working life.

For this reason, the present invention carries out for addressing the above problem, and the object of the present invention is to provide a kind of engine starting gear of long service life.

Summary of the invention

Engine starting gear of the present invention comprises: have motor body, extend out and the motor of rotatable motor shaft from motor body; Coaxial and rotation is installed in the reducing gear portion that is passed to the deceleration transfer part of above-mentioned deceleration arbor behind the deceleration arbor, the rotational delay with described motor shaft of front end of motor shaft freely with motor shaft; Have be configured in described deceleration arbor around outside, coaxial and rotate the output shaft be installed in the front end of described deceleration arbor freely and the rotation of described deceleration arbor be passed to motor with described deceleration arbor; Be configured between described deceleration arbor and the described outside and the rotation of described deceleration arbor can be passed to the clutch portion of described output shaft, wherein, described clutch portion has: with the inner cover portion of described deceleration arbor one rotation; And between described inner cover portion and sheath portion, eject maintained and in locked position and the carrier of leaving shift reciprocately between the position left from described inner cover portion, when the rotating speed of described sheath portion reaches fixing speed when above, described carrier is to the described position displacement that leaves, and the belt pulley that is wound with the transmission belt that is connected with motor is fixed on the described output shaft.

As mentioned above, in the engine starting gear of the present invention, coaxial and rotation is installed in the front end of motor shaft to the deceleration arbor of reducing gear portion freely with motor shaft, the rotation of deceleration arbor can be passed to output shaft by clutch portion, output shaft with the deceleration arbor coaxial and the rotation be installed in freely on the front end of deceleration arbor, so the deceleration arbor is difficult for motor shaft off-centre, output shaft is difficult for the speed reducer eccentric shaft.Therefore, can prolong the working life of reducing gear portion and clutch portion, prolong the working life of engine starting gear.

Description of drawings

Fig. 1 is the longitudinal sectional view of the engine starting gear of expression embodiments of the invention 1.

Fig. 2 is the longitudinal sectional view of the engine starting gear of expression embodiments of the invention 2.

Embodiment

Followingly embodiments of the invention are described with reference to accompanying drawing.

Embodiment 1

Fig. 1 represents the longitudinal sectional view of the engine starting gear of embodiments of the invention 2.Among the figure, motor 1 has motor body 2, extends out and rotatable motor shaft 3 from motor body 2.Motor body 2 has with the armature 4 of motor shaft 3 one rotations, leaves the stator 5 that surrounds armature 4 with gap.

The armature coil 7 of the peripheral part that armature 4 has the armature core 6 that is fixed on the motor shaft 3, be configured in armature core 6.By the energising to armature coil 7, armature 4 is center and the rotation of motor shaft 3 one with the axis of motor shaft 3.

Stator 5 comprises the ferrite lattice 8 with 6 extremely excitatory magnetic poles.Ferrite lattice 8 is configured to make 6 extremely excitatory magnetic poles to set equably around armature 3.

Deceleration arbor 10 is installed on the front end 9 of motor shaft 3 freely by bearing 11 rotations.Deceleration arbor 10 and motor shaft 3 coaxial settings.In addition, deceleration arbor 10 is supported on the speed reducer pedestal 12 roughly cylindraceous that is fixed on the motor body 2 by bearing 13.That is, deceleration arbor 10 is coaxial and rotatably obtain the bearing supporting by motor shaft 3 and speed reducer pedestal 12 and motor shaft 3.

The discoideus rotation board 15 that deceleration arbor 10 has the rotary shaft 14 that extends along the axis of motor shaft 3, extends to radial outside from the end side face of motor 1 side of rotary shaft 14.Be provided with the recess 16 of the front end 9 that inserts motor shaft 3 in the end of motor 1 side of rotary shaft 14.Bearing 11 is configured in the recess 16.In addition, bearing 13 is installed in the outer circumferential face of rotary shaft 14.

The partial fixing of the motor shaft 3 of close motor body 2 sides of front end 9 have with motor shaft 3 one motor rotating shaftgears be sun gear 17.In addition, the internal gear 18 of ring-type be configured in sun gear 17 around and be fixed on the inner face of speed reducer pedestal 12.Between sun gear 17 and internal gear 18, dispose a plurality of planetary pinions 19.Each planetary pinion 19 is meshing with sun gear 17 and internal gear 18.In addition, on rotation board 15, along the circumferential direction equally spaced be fixed with a plurality of supporting axles 20 that are used to install each planetary pinion 19.Each planetary pinion 19 rotates respectively and is installed in freely on the supporting axle 20.Under the rotation of motor shaft 3, each planetary pinion 19 is that move around sun gear 17 on center edge rotation limit with supporting axle 20.That is, each planetary pinion 19 revolves round the sun around sun gear 17 under the rotation of motor shaft 3.By the revolution of each planetary pinion 19, deceleration arbor 10 is that the center is rotated with the axis of deceleration arbor 10.

And the gear part 21 of deceleration transfer part has sun gear 17, internal gear 18 and a plurality of planetary pinion 19.Be passed to deceleration arbor 10 after the rotational delay of gear part 21 with motor shaft 3.

In addition, reducing gear portion 22 has deceleration arbor 10 and gear part 21.

24 rotations are installed on the front end of rotary shaft 14 output shaft 23 freely by bearing.Output shaft 23 and deceleration arbor 10 arranged coaxial.In addition, output shaft 23 is supported on chimeric being fixed on the speed reducer pedestal 12 by bearing 26.That is, output shaft 23 is coaxial and rotatably obtain bearing and support by deceleration arbor 10 and output pedestal 25 and deceleration arbor 10.

Output shaft 23 have the axial region 27 that extends along the axis of running shaft 14, from the end side face of motor 1 side of axial region 27 to extension part 28 that radial outside extends, be formed at the peripheral portion of extension part 28 and be configured in rotary shaft 14 around outside 29.Be provided with the recess 30 of the front end that inserts rotary shaft 14 in the end of motor 1 side of axial region 27.Bearing 24 is configured in the recess 30.In addition, bearing 26 is installed in the outer circumferential face of axial region 27.

Bearing 13 and the part between the bearing 24 at rotary shaft 14 are equipped with the inside 31 that rotates with arbor 10 one of slowing down.Central authorities inner 31 form the through hole 32 that runs through rotary shaft 14.The stepped part that forms the spline part that extends along the axis of rotary shaft 14 respectively, extends around the axis of rotary shaft 14 at the inner peripheral surface of the outer circumferential face of the part of the inside 31 that rotary shaft 14 is installed and through hole 32.Inner 31 by reaching chimeric (splined joint) between the stepped part between the spline part, and rotary shaft 14 is positioned.

Disposing the carrier that inner 31 rotation is passed to outside 29 between inner 31 and outside 29 is a plurality of cushion blocks 33 (sprag).Each cushion block 33 disposes swingably.That is, each cushion block 33 can between inner 31 and outside 29, eject maintained locked position and and outside 29 butts also internally 31 leave leave shift reciprocately between the position.In addition, between each cushion block 33 and outside 29, dispose the spring (not shown) of each cushion block 33 towards the locked position side application of force.And the position of centre of gravity deflection of each cushion block 33 is left the position.

In case outside 29 rotating speed is greater than inner 31 rotating speed, each cushion block 33 is made micro-displacement from locked position towards leaving the position, then internally 31 not to outside 29 transmitting rotary power.When the rotating speed of output shaft 23 continues to increase, outside 29 rotating speed reaches more than the fixing speed, then each cushion block 33 by centrifugal force overcome spring the application of force and to leaving position displacement.Here, so-called regulation speed setting must be lower slightly than the rotating speed of the output shaft 23 in when idle running.

The rotation of inside 31 is passed to outsidely 29 when each cushion block 33 is in locked position, does not then transmit to outside 29 when leaving the position when each cushion block 33 is in.When each cushion block 33 was in locked position, output shaft 23 was with the rotating speed rotation identical with deceleration arbor 10.

Clutch 34 (mono-directional overrun clutch) has inside 31 and cushion block 33.In addition, clutch 34 is aforesaid cushion block 33 31 disengagement modes of leaving internally.And clutch 34 and outside 29 is surrounded by speed reducer pedestal 12 and output pedestal 25.

In addition, belt pulley 35 is fixed in the front end of axial region 27 by nut 36.Crank pulley (not shown) is fixed on the crankshaft (not shown) of motor.Between belt pulley 35 and crank belt pulley, be wound with and transmit belt (not shown).The rotation of output shaft 23 is passed to bent axle by transmitting belt and crank pulley.Belt pulley 35 is connected by transmitting belt all the time with crank pulley.

Slow down in the speed reducer portion that is rotated in 22 of motor shaft 3, and slow down than further, be passed to bent axle then by the external diameter between belt pulley 35 and the crank pulley.The occasion that common motor is used for engine starting gear, moment of torsion and rotating speed in order to ensure the required bent axle of engine start, the reduction speed ratio of the integral body till from motor to engine crankshaft is set in about 10～15, so the reduction speed ratio of the integral body till setting for from motor 1 to engine crankshaft to the reduction speed ratio of reducing gear portion 22 and the external diameter between belt pulley 25 and the crank pulley than the reduction speed ratio that causes is about 10～15.Here, the external diameter between belt pulley 35 and the crank pulley is set in than the reduction speed ratio that causes in 1.8～2.5 the scope, and the reduction speed ratio in the reducing gear portion 22 are set in 4～9 the scope.

Below, its action is described.

At first, by motor 1 being switched on sun gear 17 and the rotation of motor shaft 3 one.Thus, each planetary pinion 19 revolution around sun gear 17.At this moment, deceleration arbor 10 is center and the rotation of inner 31 one with the revolution speed of each planetary pinion 19 with the axis of deceleration arbor 10 also.

Each cushion block 33 of this moment is in locked position under the application of force of spring, outside 29 is in the lock state with respect to inner 31.Therefore, output shaft 23 is with the rotating speed rotation identical with inner 31.Thus, the crankshaft rotating of motor, engine start.

After the rotation starting of motor by bent axle, the rotating speed of bent axle and output shaft 23 rises under the driving of motor.When the rotating speed when outside 29 reached the rotating speed of regulation greater than the rotating speed of inside 31, each cushion block 33 left the position because of centrifugal force is moved to.Thus, the lock state between inner 31 and outside 29 is disengaged, and inner 31 become idling conditions.That is, the rotating power of motor 1 does not transmit to output shaft 23.Then, motor 1 stops energising, and motor is in idling conditions.

In the above-mentioned engine starting gear, coaxial and the rotation of deceleration arbor 10 and motor shaft 3 is installed on the front end 9 of motor shaft 3 freely, coaxial and the rotation of output shaft 23 and deceleration arbor 10 is installed on the front end of deceleration arbor 10 freely, so deceleration arbor 10 is difficult for motor shaft 3 off-centre, output shaft 23 is difficult for deceleration arbor 10 off-centre.Therefore, smooth and easy such as the revolution of each planetary pinion 19, in addition, inner 31 with each cushion block 33 mutual zero deflection contact.Therefore, can improve the working life of reducing gear portion 22 and clutch portion 34, improve the working life of engine starting gear integral body.

In addition, owing on deceleration arbor 10, be provided with the recess 16 of the front end 9 that inserts motor shaft 3,, can make the engine starting gear miniaturization so can shorten the length of engine starting gear on the axial direction of motor shaft 3.

In addition, owing on output shaft 23, be provided with the recess 30 of the front end that inserts rotary shaft 14,, can make the further miniaturization of engine starting gear so can shorten the length of engine starting gear on the axial direction of motor shaft 3.

In addition, have owing to gear part 21: with the sun gear 17 of motor shaft 3 rotations; Be configured in the internal gear 18 of sun gear 17 ring-type on every side; And be configured between fixed star 17 and the internal gear 18, a plurality of planetary pinions 19 of revolution around the fixed star 17, thereby can easily make the reducing gear portion 22 of big reduction speed ratio with simple structure.

In addition, speed reducer pedestal 12 and output pedestal 25 are chimeric so that output shaft 23 is coaxial with deceleration arbor 10 mutually, output shaft 23 is coaxial with deceleration arbor 10 by the front end of rotary shaft 14 but also by 25 supportings of output pedestal not only, and be difficult for off-centre, can prolong the working life of clutch portion 23.

In addition, deceleration arbor 10 is installed on the front end 9 of motor shaft 3 so that it is coaxial with motor shaft 3, and by the speed reducer pedestal 12 bearings supporting fixing with respect to motor body 2, thereby motor shaft 3 and deceleration arbor 10 more difficult off-centre can further improve working life of reducing gear portion 22.In addition, the backlash at gear part 21 places reduces, and can reduce the gear noiose at reducing gear portion 22 places.

In addition, the reduction speed ratio in the reducing gear portion 22 are set in 4～9 the scope, so can use the motor 1 of common output and the belt pulley 25 and the crank pulley of common external diameter ratio, can restrain the increase of the manufacture cost of engine starting gear.

In addition, motor body 2 has the armature 4 that rotates with motor shaft 3 one, the ferrite lattice with a plurality of excitatory magnetic fields 8 on every side that is provided in armature 4, so can make motor 1 at an easy rate.

Embodiment 2

Fig. 2 is the longitudinal sectional view of the engine starting gear of expression embodiments of the invention 2.Among the figure, between deceleration arbor 10 and the speed reducer pedestal 12, between output shaft 23 and the output pedestal 25, speed reducer pedestal 12 disposes

sealing component

41,42,43 respectively with exporting between the pedestal 25.Sealing component 41 is configured between bearing 13 and inner 31.Sealing component 42 is configured between bearing 26 and the extension part 28.Sealing component 43 is configured in the speed reducer pedestal 12 and output pedestal 25 mutual chimeric parts around outside 29.

There is being oil by speed reducer pedestal 12 and space 44 inner products that output pedestal 25 impales.The amount that oil accumulates will make the part of outside 29 be immersed in the oil at least.

Sealing component

41,42,43 has been arranged, and oil can not spill.

On speed reducer pedestal 12, be provided with the pressure by air pressure modulating valve 45 that is used to regulate space 44.By pressure regulator valve 45, the air pressure in space 44 is the authorized pressure of degree in working life of not influencing

sealing component

41,42,43.Other structures are identical with embodiment 1.

So because a part of outside at least 29 is immersed in the oil, so externally under 29 the rotation oil can flow through clutch 34 and outside 29, can prevent faults such as sintering such as clutch portion 34, can improve the working life of clutch portion 34.

In addition,

sealing component

41,42,43 because be configured between deceleration arbor 10 and the speed reducer pedestal 12, output shaft 23 with export between the pedestal 25, speed reducer pedestal 12 and exporting between the pedestal 25, thereby can prevent to stockpile the leakage of the oil in space 44, in the long-term faults such as sintering that also can prevent clutch portion 34 under the oil condition of not replenishing.In addition, the

sealing component

41,42,43 of packing in the process of each member such as assembling speed reducer pedestal 12, inside 31, cushion block 33, output shaft 23 gets final product, thereby sealing

component

41,42,43 is installed easily.

In addition, owing on speed reducer pedestal 12, be provided with the pressure by air pressure modulating valve 45 that is used to regulate space 44,, can prevent that also the pressure abnormity in space 44 from rising even rise because of the starting of engine starting gear such as the temperature in the space 44.Therefore,

sealing component

41,42,43 is not subject to the air pressure in space 44 and is out of shape, and can improve the working life of

sealing component

41,42,43.

As with the place-exchange of sealing component 41 with bearing 13, promptly between sealing component 41 and inner 31, dispose bearing 13, then oil can be flowed through bearing 13, can improve the working life of bearing 13.

In addition, in the above-mentioned example, pressure regulator valve 45 is arranged on the speed reducer pedestal 12, but also can be arranged on the output pedestal 25.

In addition, in the above-mentioned example, a part of outside 29 is immersed in the oil, as long as accessible to the transmission of rotation, except outside 29, the part of clutch portion 34 can not had by oil immersion yet.

Claims

1. engine starting gear is characterized in that having:

Motor, it has motor body, from the extended rotatable motor reel of described motor body;

Reducing gear portion, its have with described motor reel coaxially, the rotation deceleration transfer part that is installed in the deceleration arbor on the described motor reel front end freely and the rotation of described motor reel is slowed down and transmitted to described deceleration arbor;

Output shaft, it has and is configured in the axial sheath portion of described speed reducer, with described deceleration arbor coaxially, rotation is installed on the front end of described deceleration arbor freely, and the rotation of described deceleration arbor is passed to motor; And

Clutch portion, it is configured between described deceleration arbor and the described sheath portion, the rotation of described speed reducer can be passed to described output shaft,

Wherein, described clutch portion has: with the inner cover portion of described deceleration arbor one rotation; And between described inner cover portion and sheath portion, eject maintained and in locked position and the carrier of leaving shift reciprocately between the position left from described inner cover portion,

When the rotating speed of described sheath portion reaches fixing speed when above, described carrier is to the described position displacement that leaves, and

The belt pulley that is wound with the transmission belt that is connected with motor is fixed on the described output shaft.

2. engine starting gear as claimed in claim 1 is characterized in that, is provided with the recess that inserts described motor reel front end on described deceleration arbor.

3. as claim 1 or the described engine starting gear of claim 2, it is characterized in that, on described output shaft, be provided with the recess that inserts described deceleration arbor front end.

4. engine starting gear as claimed in claim 1 is characterized in that, described deceleration transfer part has: rotate with described motor reel and be located at motor reel gear on the described motor reel; Be fixed on the described motor body and be configured in the internal gear of the ring-type around the described motor reel gear; Be configured in the planetary pinion that revolves round the sun around described motor reel gear between described motor reel gear and the described internal gear, along with the rotation of described motor reel gear on every side,

Described deceleration arbor becomes the state that rotates along with described planetary revolution.

5. engine starting gear as claimed in claim 1 is characterized in that, described clutch portion and described sheath portion are rotated the speed reducer shaft tray that supports described deceleration arbor freely and rotation and support the output shaft carriage of described output shaft freely and surround,

Described speed reducer shaft tray and the described output shaft of the mutual chimeric one-tenth of described output shaft carriage are coaxial with described deceleration arbor.

6. engine starting gear as claimed in claim 1 is characterized in that the part of described at least sheath portion is not had by oil immersion, and by the rotation of described sheath portion, oil is flowed through described inner cover portion, described transfer part and sheath portion.

7. engine starting gear as claimed in claim 6, it is characterized in that, between described deceleration arbor and the described speed reducer shaft tray, between described output shaft and the described output shaft carriage and between described speed reducer shaft tray and the described output shaft carriage, dispose the sealing component that is used for preventing described oil leakage.

8. as claim 6 or the described engine starting gear of claim 7, it is characterized in that, the at least any one party of described speed reducer shaft tray and described output shaft carriage is provided with to be used for regulating and is regulated by described deceleration arbor and described output shaft is regulated pressure by air pressure modulating valve in the space that surrounds.

9. engine starting gear as claimed in claim 1 is characterized in that, the reduction speed ratio of described reducing gear portion is in 4～9 the scope.

10. engine starting gear as claimed in claim 1 is characterized in that, described motor body has the armature that rotates with described motor reel one and is provided in the described armature ferrite magnet that a plurality of excitation fields are arranged on every side.