CN210978504U

CN210978504U - Automobile transmission parking device

Info

Publication number: CN210978504U
Application number: CN201921836314.XU
Authority: CN
Inventors: 秦伟宁
Original assignee: Chongqing Tsingshan Industrial Co Ltd
Current assignee: Chongqing Tsingshan Industrial Co Ltd
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2020-07-10
Anticipated expiration: 2029-10-29

Abstract

The utility model discloses an automotive transmission parking device, it includes parts such as ratchet, pawl assembly, pawl return spring, cam assembly, and the pawl assembly includes pawl and control arm. Through limiting plate and control arm and cooperation among the cam assembly, can realize reaching the rotation control of pawl assembly: when the gear is not P, the limiting plate restricts the pawl assembly to rotate clockwise, so that a series of problems caused by contact between the pawl and the ratchet wheel due to overlarge vibration of a transmission or attenuation of spring force of a pawl return spring and the like in the running process of a vehicle are avoided; when the vehicle moves back to the P gear, the limiting plate rotates clockwise and applies driving force to the control arm, the auxiliary pawl moves back from the tooth groove, if the driving force is insufficient, the pawl is not separated from the ratchet wheel, the rotating angle of the cam assembly does not meet the requirement, the system fails to feed back and shift gears, and the problems that the P gear moving operation is completed due to self-locking of the pawl and the ratchet wheel for various reasons, parking locking is still not released, and the vehicle cannot move are solved.

Description

Automobile transmission parking device

Technical Field

The utility model relates to an automotive transmission parking device.

Background

The parking device of the common automobile transmission comprises a push rod assembly 1, a guide plate 2, a pawl 3 and a ratchet wheel 4, as shown in figure 1, the push rod assembly 1 (comprising a cam and a spring) moves linearly, the cam pushes the pawl 3 to rotate under the action of the spring, so that the pawl 3 is matched with a groove on the ratchet wheel 4, the cam, the pawl 3 and the guide plate 2 are self-locked, an output end is locked, and parking is achieved. When the P gear is withdrawn, the push rod assembly 1 is linearly withdrawn to pull out the cam to release self-locking, and the pawl 3 is withdrawn from the tooth groove under the combined action of the pawl return spring and the ratchet wheel 4 to release locking.

For the parking device with the structure, if the pawl return spring arranged on the pawl fails, the pawl has no rotation restriction, and is contacted with the ratchet wheel 4 in the driving process of the vehicle, so that abnormal sound is generated if the vehicle is light, and driving safety accidents occur if the vehicle is heavy. Further, in the non-pawl position detecting and controlling device, if the pawl cannot be automatically withdrawn from the ratchet groove due to various reasons during the P-reverse operation, the parking state is not released even if the P-reverse operation is completed, and if the vehicle is forcibly started, the transmission may be damaged. Therefore, the safety of the conventional parking device is relatively poor.

Disclosure of Invention

The utility model provides a high, installation space strong adaptability's automotive transmission parking device of security.

The technical scheme for realizing the purpose is as follows:

the utility model provides an automotive transmission parking device, its includes parts such as ratchet, pawl assembly, pawl return spring, pawl round pin, cam assembly, sector gear assembly, its characterized in that:

the pawl assembly comprises a control arm and a pawl, and the cam assembly is matched with the control arm and the pawl respectively. When the cam assembly rotates anticlockwise, the pawl is driven to overcome the spring force of the pawl return spring, and pawl teeth are inserted into tooth grooves of the ratchet wheel to lock the ratchet wheel. When the cam assembly rotates clockwise, the displacement limitation on the pawl is removed, the pawl is withdrawn from the tooth groove of the ratchet wheel under the action of the torsion of the pawl return spring or the ratchet wheel torsion, so that the ratchet wheel is unlocked, or when the pawl cannot be automatically withdrawn from the tooth groove of the ratchet wheel, the cam assembly applies acting force to the control arm in the clockwise rotation process, and the pawl is directly driven to be withdrawn from the tooth groove so that the ratchet wheel is unlocked. When the gear is not P, the cam assembly is in a locking state, and the pawl and the tooth top of the ratchet wheel are always kept in a clearance by restraining the clockwise rotation of the control arm.

In addition, in order to improve the adaptability of the parking device in the transmission, a sector gear assembly can be added to enlarge the center distance between the ratchet wheel and the output end of the motor or the center distance between the ratchet wheel and the stay cable rocker arm.

Therefore, the utility model discloses a parking device utensil security is high, installation space strong adaptability's advantage.

Drawings

FIG. 1 is a schematic view of a prior art parking device;

fig. 2 is a schematic view of the parking device of the transmission of the present invention in a non-P-range state;

fig. 3 is a schematic structural view of a pawl assembly according to the present invention;

FIG. 4 is a schematic view in another orientation of FIG. 2;

fig. 5 is a schematic cross-sectional view of a cam assembly according to the present invention;

fig. 6 is a schematic view of a cam in the present invention;

fig. 7 is a schematic view of a limiting plate according to the present invention;

fig. 8 is a schematic diagram of the parking device of the transmission in the P-range state;

FIG. 9 is a schematic view of the sector shaft assembly added to the embodiment of FIG. 2;

marking in the accessory:

the ratchet wheel is 1, the tooth socket is 1a, the pawl return spring is 2, the pawl is 3, the pawl tooth is 3a, the roller is 3b, the roller pin is 3c, the control arm is 4, the control arm body is 4a, the control arm surface is 4b, the pawl pin is 5, the cam is 6, the first arc surface is 6a, the second arc surface is 6b, the cam limiting surface is 6c, the limiting plate is 7, the first limiting surface is 7a, the second limiting surface is 7b, the third limiting surface is 7c, the cam shaft is 8, the parking spring retainer ring is 9, the parking spring is 10, the retainer ring is 11, the cylindrical pin is 12, the sector gear is 13, and the sector gear shaft is 14.

Detailed Description

As shown in fig. 2, the parking device of the automotive transmission of the present invention includes a ratchet 1, a pawl return spring 2, a pawl pin 5, a pawl assembly, a cam assembly and a sector gear assembly, and each part and the relationship therebetween are explained in detail as follows:

as shown in fig. 2, the ratchet 1 includes a plurality of tooth grooves 1a, and the ratchet 1 is restricted from rotating when the pawl tooth 3a is inserted into the tooth groove 1a, and the ratchet 1 can rotate after the pawl tooth 3a is withdrawn from the tooth groove 1 a.

As shown in fig. 2, two torque arms of the pawl return spring 2 are respectively connected with the control arm 4 and the box body to provide torque force for the pawl;

as shown in fig. 2 and 3, the pawl assembly includes a pawl 3 and a control arm 4, the pawl 3 includes pawl teeth 3a, a roller 3b and a roller pin 3c, and the control arm 4 includes a control arm body 4a and a control arm surface 4 b. The roller pin 3c and the roller 3b are combined to reduce the shifting force.

As shown in fig. 2, the pawl pin 5 is connected to the pawl assembly to limit the radial displacement of the pawl and allow the rotational movement of the pawl.

As shown in fig. 5, 6 and 7, the cam assembly includes a cam 6, a limit plate 7, a cam shaft 8, a parking spring retainer 9, a parking spring 10, a retainer ring 11 and a cylindrical pin 12. The cylindrical pin 12 connects the stopper plate 7 and the camshaft 8, and restricts relative rotation therebetween. The limiting plate 7 comprises a first limiting surface 7a, a second limiting surface 7b and a third limiting surface 7 c. The first limit surface 7a is matched with the control arm surface 4b when the gear is not P, and the pawl 3 is limited to rotate clockwise. The second limiting surface 7b is matched with the control arm surface 4b when the P gear is withdrawn, and provides circumferential force for the pawl assembly. The third limiting surface 7c limits the cam 6 to rotate relatively in one direction or provide driving force for the cam 6 when moving back to the P position. The cam 6 comprises a first arc surface 6a, a second arc surface 6b and a cam limiting surface 6 c. When the first arc surface 6a is in the P gear, the pawl 3 is limited from withdrawing from the tooth groove 1 a. The second arc surface 6b restricts the pawl 3 from rotating in one direction when the shift is not P. The cam limiting surface 6c is matched with the third limiting surface 7 c. The collar 11 controls the axial clearance between the cam 6 and the limit plate 7. The parking spring retainer ring 9 is welded on the camshaft 8 according to a certain angle and distance. The parking spring 10 is sleeved on the camshaft 8, and two torsion arms of the parking spring are respectively matched with the parking spring retainer ring 9 and the cam 6 to provide torsion for the cam. The cam 6 is in clearance fit with the hole shaft of the cam shaft 8.

And (4) a P gear engaging process: a motor or a guy cable rocker arm drives a cam shaft 8 to rotate anticlockwise, a parking spring retainer ring 9 rotates synchronously, P-gear-engaging torque is transmitted to a cam 6 through a parking spring 10, the cam 6 is matched with a roller 3b, and pawl teeth 3a are pressed into a tooth groove 1a through the height difference change of a second arc surface 6b and a first arc surface 6a, so that ratchet locking is realized; when the pawl tooth 3a is opposite to the tooth top of the ratchet wheel 1, the cam shaft 8 still rotates because the pawl 1 cannot rotate, the parking spring 10 is compressed and stores spring force, and when the opposite state of the pawl tooth 3a and the tooth top of the ratchet wheel 1 is released, the parking spring 10 drives the cam 6 by the spring force to press the pawl tooth 3a into the tooth groove 1a, so that ratchet wheel locking is realized.

P gear shifting process: the motor or the inhaul cable rocker arm drives the cam shaft 8 to rotate clockwise, the limiting plate 7 rotates synchronously, the cam 6 is matched with the cam limiting surface 6c through the third limiting surface 7c, the cam 6 is forced to move anticlockwise, the limitation on the displacement of the pawl 3 by the cam 6 is relieved due to the height difference change of the first arc surface 6a and the second arc surface 6b, the pawl tooth 3a is separated from the tooth groove 1a under the combined action of the torsion of the pawl return spring 2 or the ratchet 1, and the locking of the ratchet 1 is relieved. When the pawl tooth 3a and the tooth groove 1a are self-locked for various reasons and cannot be automatically separated, the limiting plate 7 applies circumferential driving force to the control arm surface 4b in the clockwise rotation process, the auxiliary pawl tooth 3a is withdrawn from the tooth groove 1a, if the driving force is insufficient, the pawl tooth 3a and the tooth groove are not separated, and the system feedback gear shifting fails because the rotation angle of the cam shaft 8 does not meet the requirement.

When the gear is not P: the limiting plate 7 is in a locking state, and the first limiting surface 7a is matched with the control arm surface 4b to limit the pawl 3 to rotate clockwise, so that the pawl 3 and the ratchet wheel 1 always keep a gap.

As shown in fig. 9, in order to improve the adaptability of the parking device in the transmission, a sector gear assembly may be added to enlarge the center distance between the ratchet 1 and the output end of the motor or the center distance between the pull cable and the rocker arm. The parking sector gear assembly comprises a sector gear 13, a sector gear shaft 14 and a split spring pin. The sector shaft 14 and the sector gear 13 are connected by a split spring pin to transmit the shifting torque. The sector gear 13 and the limit plate 7 transmit the shifting torque force through the gear pair. The working principle is the same as that described above.

Claims

1. The utility model provides an automotive transmission parking mechanism, its includes parts such as ratchet, pawl assembly, pawl return spring, pawl round pin, cam assembly, sector gear assembly, its characterized in that:

the pawl assembly comprises a control arm and a pawl, the cam assembly is respectively matched with the control arm and the pawl,

when the cam assembly rotates anticlockwise, the pawl is driven to overcome the spring force of the pawl return spring, so that the pawl teeth are inserted into the tooth grooves of the ratchet wheel to lock the ratchet wheel,

when the cam assembly rotates clockwise, the displacement limitation on the pawl is removed, the pawl withdraws from the tooth groove of the ratchet wheel under the action of the torsion of the pawl return spring or the ratchet wheel torsion, so as to remove the locking of the ratchet wheel, or when the pawl can not automatically withdraw from the tooth groove of the ratchet wheel, the cam assembly applies acting force to the control arm in the clockwise rotation process, directly drives the pawl to withdraw from the tooth groove so as to remove the locking of the ratchet wheel,

when the gear is not P, the cam assembly is in a locking state, the control arm is restrained to rotate clockwise, so that the gap between the pawl and the tooth top of the ratchet wheel is always kept,

in order to improve the adaptability of the parking mechanism in the transmission, a sector gear assembly can be added to enlarge the center distance between the ratchet wheel and the output end of the motor or the stay cable rocker arm.

2. The parking mechanism of claim 1, wherein the pawl further comprises pawl teeth, a roller pin and a roller engaged with the cam assembly, the pawl teeth are provided with roller grooves at upper ends, the roller pin passes through the roller and two ends of the roller pin are respectively connected with the pawl;

the control arm comprises a control arm body and a control arm surface matched with the cam assembly.

3. The vehicle transmission park mechanism of claim 2, wherein the cam assembly comprises:

a cam cooperating with the roller;

the limiting plate is matched with the surface of the control arm and limits the unidirectional rotation of the cam;

and the cam and the limiting plate are respectively arranged on the cam shaft.

4. The vehicle transmission park mechanism of claim 3, wherein the cam assembly further comprises:

the parking spring retainer ring is welded on the camshaft;

the parking spring is sleeved on the camshaft, and two torsion arms of the parking spring are respectively connected with the parking spring retainer ring and the cam.

5. The parking mechanism of the automobile transmission according to claim 3, wherein a first limiting surface which is matched with the control arm surface when the P gear is not set is arranged on the circumferential surface of the limiting plate.

6. The parking mechanism of claim 3, wherein the second limiting surface for applying driving force to the control arm surface when the P-gear is released is arranged on the limiting plate.

7. The parking mechanism of claim 3, wherein the third limiting surface is disposed on the limiting plate for limiting the cam to apply the driving force when the cam rotates in one direction or moves back to the P position.

8. The parking mechanism of claim 1 or 3, wherein the cam is provided with a first arc surface for limiting the unidirectional rotation of the pawl when the P-range is performed, and the first arc surface is coaxial with the rotation center of the cam.

9. The parking mechanism of claim 1 or 3, wherein the cam is provided with a second arc surface for limiting the unidirectional rotation of the pawl when the cam is not in the P range, and the second arc surface is coaxial with the rotation center of the cam.

10. The parking mechanism of claim 1 or 3, wherein the cam is provided with a second arc surface for limiting the unidirectional rotation of the pawl when the cam is not in the P range, and the second arc surface is coaxial with the rotation center of the cam.

11. The parking mechanism of the automobile transmission according to claim 3 or 7, wherein the cam is provided with a cam limiting surface matched with the third limiting surface of the limiting plate.

12. The automotive transmission park mechanism of claim 3 or 4, wherein the cam assembly further comprises:

the cylinder pin, be equipped with the through-hole on the camshaft, the limiting plate terminal surface is equipped with the keyway, and the cylinder pin passes through-hole and its tip stretch into in the keyway.

13. The vehicle transmission park mechanism of claim 1, wherein the sector gear assembly further comprises:

the sector gear is used for transmitting power and matched with the limiting plate;

and the sector gear is arranged on the sector gear shaft.