CN209875921U

CN209875921U - Compact parking mechanism for automatic transmission or electric vehicle speed reducer

Info

Publication number: CN209875921U
Application number: CN201821354574.9U
Authority: CN
Inventors: 周志红; 白秀超; 刘君祺; 姜德政; 周邦羽
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2018-08-22
Filing date: 2018-08-22
Publication date: 2019-12-31
Anticipated expiration: 2028-08-22

Abstract

The utility model relates to a compact parking mechanism for automatic gearbox or electric motor car reduction gear, its characterized in that: the rear end of the pawl is fixedly connected with a pawl shaft, one side of the upper end of the pawl is inserted into a fixed support, two unthreaded holes are formed above the fixed support and fixed on a speed changer or a speed reducer shell through two screws, the front end of the fixed support is of a wrapped n-shaped groove structure, the front end of the top surface of the n-shaped groove is provided with a rectangular groove, the rear end of the fixed support is bent at a right angle, and a round hole is formed in the bent part; the push rod ball assembly is arranged above the pawl, the front end of the push rod ball assembly is matched with the camshaft, the push rod ball assembly comprises a push rod, a spring, a push block and four balls with the same size, the rear end of the push rod ball assembly is inserted into a round hole in the rear end of the fixed support, the rear end of the push rod penetrates through the round hole and then is riveted and deformed, the one-way limiting of the push rod is realized, and the parking mechanism is compact in structure, small in size, high in integration level, small in system loss and convenient to install and disassemble.

Description

Compact parking mechanism for automatic transmission or electric vehicle speed reducer

Technical Field

The utility model relates to a parking mechanism for automatic gearbox or electric locomotive reduction gear belongs to automobile manufacturing's passenger car automatic gearbox or electric motor car reduction gear technical field.

Background

At present, the requirement of a generalized passenger car on the overall dimension of an automatic transmission or a speed reducer is more and more compact, the requirement on the integration level of parts is higher, from the viewpoint of reducing development and maintenance costs, the quantity of the parts is required to be less and less, meanwhile, the friction loss of a system is required to be lower and lower, and the requirements of compact structure, high integration level, less parts, energy conservation and convenience in mounting and dismounting are provided from assemblies to the parts.

Meanwhile, the parking structure for the common passenger car automatic transmission or electric vehicle speed reducer in the market mainly comprises three types: the first type is a push rod lock pin type parking mechanism, such as the invention patent CN 201510559644.9; the second is a rotating shaft cam type parking mechanism, such as CN 201410630702.8; the third category is a push-to-roller parking mechanism, such as DE 10131735A. The three types of parking mechanisms comprise pawls for locking the ratchet wheels and actuating mechanisms for pushing the pawls, the pawls comprise reset springs or reset torsion springs, the actuating mechanisms for pushing the pawls comprise compression springs or compression torsion springs, and the number of parts is large; secondly, the three types of parking mechanisms are embodied in various structures, the integration level is not high enough, the occupied space is different, the universality is poor, and the three types of parking mechanisms cannot be applied to various automatic transmissions or electric vehicle speed reducers.

Disclosure of Invention

The utility model aims at providing a parking mechanism for automatic transmission or electric locomotive reduction gear, it is a compact structure, the size is little, the integrated level is high, the system loss is little, the convenient parking mechanism is disassembled in the installation.

The technical scheme of the utility model is realized like this: the utility model provides a parking mechanism for automatic gearbox or electric locomotive reduction gear, comprises fixed bolster, push rod ball assembly, pawl axle, ratchet and camshaft, its characterized in that: the rear end of the pawl is fixedly connected with a pawl shaft, one side of the upper end of the pawl is inserted into a fixed support, two unthreaded holes are formed above the fixed support and fixed on a speed changer or a speed reducer shell through two screws, the front end of the fixed support is of a wrapped n-shaped groove structure, the front end of the top surface of the n-shaped groove is provided with a rectangular groove, the rear end of the fixed support is bent at a right angle, and a round hole is formed in the bent part; the push rod ball assembly is arranged above the pawl, the front end of the push rod ball assembly is matched with the camshaft, the push rod ball assembly comprises a push rod, a spring, a push block and four balls with the same size, the rear end of the push rod ball assembly is inserted into a round hole in the rear end of the fixed support, the rear end of the push rod penetrates through the round hole and then is riveted and deformed, the one-way limiting of the push rod is realized, the front end of the push rod is fixedly connected with the push block, the push block is positioned in an n-shaped groove of the fixed support, the four balls are embedded in four semicircular grooves of the push block, the front pair of balls and the rear pair of balls are in tangential contact in an installation state, the two pairs of balls perform rolling motion between the fixed support and the pawl, the spring is sleeved on; the end of the push block is arc-shaped and is contacted with the arc surface of the cam shaft; the front end of the pawl is meshed with the ratchet wheel.

The utility model has the advantages that the push block spring and the pawl return torsion spring are replaced by one spring through the innovative structural design, the number of parts is reduced, and the integrated compact design is realized; meanwhile, the friction force between the pawl and the push block and between the push block and the fixed support is changed into rolling friction force by adopting a structure of two pairs of mutually opposite rolling balls, so that the parking unlocking force is reduced, and the P gear shifting comfort of the automatic transmission or the speed reducer is improved. In addition, because entire system integrated level is high, the space occupies comparatively regularly simultaneously for this parking structure extensive applicability is extensive, and the installation is disassembled conveniently.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic diagram of the structure of the push rod ball assembly of the present invention.

Fig. 3 is a schematic view of the fixing bracket structure of the present invention.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings: as shown in fig. 1-3, a parking mechanism for an automatic transmission or an electric locomotive reducer comprises a fixed support 1, a push rod ball assembly 2, a pawl 3, a pawl shaft 4, a ratchet wheel 5 and a cam shaft 6, and is characterized in that: the rear end of the pawl 3 is fixedly connected with a pawl shaft 4, one side of the upper end of the pawl 3 is inserted into the fixed support 1, two unthreaded holes 102 are formed above the fixed support 1 and fixed on a speed changer or a speed reducer shell through two screws, the front end of the fixed support 1 is of a wrapped n-shaped groove 103 structure, the front end of the top surface of the n-shaped groove 103 is provided with a rectangular groove 104, the rear end of the fixed support 1 is bent at a right angle, and a round hole 101 is formed in the bent part; the push rod ball assembly 2 is arranged above the pawl, the front end of the push rod ball assembly 2 is matched with the camshaft 6, the push rod ball assembly 2 comprises a push rod 201, a spring 202, a push block 203 and four balls 204 with the same size, the rear end of the push rod 201 of the push rod ball assembly 2 is inserted into a round hole 101 at the rear end of the fixed support 1, the rear end of the push rod 201 passes through the round hole 101 and then is riveted and deformed to realize the one-way limit of the push rod 201, the front end of the push rod 201 is fixedly connected with a push block 203, the push block 203 is positioned in the n-shaped groove 103 of the fixed bracket 1, the four balls 204 are embedded in the four semicircular grooves of the push block 203, the front pair of balls 204 and the rear pair of balls 204 are in tangential contact in the installation state, the two pairs of balls 204 perform rolling motion between the fixed support 1 and the pawl 3, the spring 202 is sleeved on the push rod 201, one end of the spring 202 pushes against the push block 203, the other end pushes against the tail of the pawl 3, and the push rod 201 and the pawl 3 realize reset through the spring 202; the end of the push block 203 is arc-shaped and is contacted with the arc surface of the cam shaft 6; the front end of the pawl 3 is engaged with the ratchet wheel 5.

The pawl 3 is arranged on a pawl shaft 4, the pawl shaft 4 is fixed in a transmission or a speed reducer shell, the pawl 3 can only swing around the pawl shaft 4, a bulge is arranged at the head of the pawl 3, and the ball 204 rolls on the bulge of the pawl in a reciprocating way to promote the pawl 3 to swing, so that the pawl 3 locks the ratchet 5; the ratchet wheel 5 is fixed on a speed changer or a speed reducer shaft; the camshaft 6 is arranged on a speed changer or a speed reducer shell, the camshaft 6 rotates to push the push block 203 to move, the push rod ball assembly 2 slides in the fixed support 1, the pawl 3 is promoted to swing, and then the pawl 3 and the ratchet wheel 5 are combined and separated.

As shown in fig. 1 and fig. 2, the push rod ball assembly 2 comprises a push rod 201, a spring 202, a push block 203 and four identical balls 204, the push block 201 of the push rod ball assembly 2 slides in the n-shaped groove 103 of the fixed bracket 1, and the push rod 201 of the push rod ball assembly 2 slides in the circular hole 101 at the bending position of the fixed bracket 1 in an extending and contracting manner; the four balls 204 are embedded in the four semicircular grooves of the push block 203, the front and rear pairs of balls 204 are in tangential contact in the installation state, and the two pairs of balls 204 perform rolling motion between the fixed support 1 and the pawl 3; the head of the push block 203 is arc-shaped and is in tangential contact with the arc surface of the cam shaft 6, and the middle part of the push block 203 is provided with a circular groove which is riveted or welded with the push rod 201; one end of the push rod 201 is connected with the push block 203, and the other end of the push rod 201 penetrates through the round hole 101 of the fixing support 1 to be riveted and deformed to realize unidirectional limiting of the push rod 201; the spring 202 is sleeved on the push rod 201, one end of the spring 202 pushes against the push block 203, and the other end pushes against the tail part of the pawl 3;

as shown in fig. 3, two unthreaded holes 102 are formed above the fixed support 1 and fixed on a transmission or a speed reducer casing through two screws, one end of the fixed support 1 is a wrapped n-shaped groove 103, the top of the n-shaped groove 103 is provided with a rectangular groove 104, and a round hole 101 is formed at the bending part of the other end of the fixed support 1.

The specific working process is as follows:

when the parking is to be changed from the unlocking state to the locking state, the cam shaft 6 rotates clockwise, the spring 202 pushes the push block 203 to slide from inside to outside in the n-shaped groove 103 of the fixed support 1, the push block 203 rolls on the bulge at the head of the pawl 3, the pawl 3 is pressed to swing clockwise, the pawl 3 is enabled to lock the ratchet wheel 5, and the parking locking is achieved. Similarly, when the parking will become the unblock state from the locking state, camshaft 6 anticlockwise rotates, and camshaft 6 promotes ejector pad 203 along the outside-in motion in n type groove of fixed bolster 1, and simultaneously, rectangular channel 104 on the fixed bolster 1 avoids camshaft 6, prevents to interfere, so, ejector pad 203 breaks away from the 3 head of pawl is protruding, under the promotion of spring 202 for pawl 3 anticlockwise rotates, and pawl 3 and ratchet 5 separate, realize the parking unblock.

In the parking locking process, one end of the spring 202 acts on the push block 203 to generate clockwise rotation torque of the pawl 3, and the clockwise rotation torque of the pawl 3 is larger than the anticlockwise rotation torque of the pawl 3 generated by the other end of the spring 202 acting on the tail portion of the pawl 3, so that the parking locking can be realized by means of the spring 202. Meanwhile, the pushing block 203 is pushed by means of the counterclockwise rotation of the cam shaft 6 to realize parking unlocking.

Claims

1. The utility model provides a compact parking mechanism for automatic gearbox or electric motor car reduction gear, comprises fixed bolster, push rod ball assembly, pawl axle, ratchet and camshaft, its characterized in that: the rear end of the pawl is fixedly connected with a pawl shaft, one side of the upper end of the pawl is inserted into a fixed support, two unthreaded holes are formed above the fixed support and fixed on a speed changer or a speed reducer shell through two screws, the front end of the fixed support is of a wrapped n-shaped groove structure, the front end of the top surface of the n-shaped groove is provided with a rectangular groove, the rear end of the fixed support is bent at a right angle, and a round hole is formed in the bent part; the push rod ball assembly is arranged above the pawl, the front end of the push rod ball assembly is matched with the camshaft, the push rod ball assembly comprises a push rod, a spring, a push block and four balls with the same size, the rear end of the push rod ball assembly is inserted into a round hole in the rear end of the fixed support, the rear end of the push rod penetrates through the round hole and then is riveted and deformed, the one-way limiting of the push rod is realized, the front end of the push rod is fixedly connected with the push block, the push block is positioned in an n-shaped groove of the fixed support, the four balls are embedded in four semicircular grooves of the push block, the front pair of balls and the rear pair of balls are in tangential contact in an installation state, the two pairs of balls perform rolling motion between the fixed support and the pawl, the spring is sleeved on; the end of the push block is arc-shaped and is contacted with the arc surface of the cam shaft; the front end of the pawl is meshed with the ratchet wheel.