CN220365941U

CN220365941U - Gear shifting parking device of automatic transmission

Info

Publication number: CN220365941U
Application number: CN202321648305.4U
Authority: CN
Inventors: 胡禅
Original assignee: Nanjing Bangqi Automatic Transmission Co ltd
Current assignee: Nanjing Bangqi Automatic Transmission Co ltd
Priority date: 2023-06-27
Filing date: 2023-06-27
Publication date: 2024-01-19
Anticipated expiration: 2033-06-27

Abstract

The utility model discloses a gear shifting parking device of an automatic transmission, which comprises a parking pawl, a push rod assembly and a guide element movably arranged on the push rod assembly, wherein the guide element comprises a guide pin, and a guide groove for inserting the guide pin is formed in the parking pawl. According to the gear shifting and parking device of the automatic transmission, the guide element is arranged to be matched with the parking pawl, so that faults can be avoided, and the working reliability is improved.

Description

Gear shifting parking device of automatic transmission

Technical Field

The utility model belongs to the technical field of transmissions, and particularly relates to a gear shifting parking device of an automatic transmission.

Background

The existing automatic gearbox and part of new energy reduction gearbox are internally provided with a P-gear parking mechanism, and the structure of the P-gear parking mechanism is shown in fig. 9. In the current P gear outlet process of the whole vehicle P gear parking system, a driving push rod is generally separated from a pawl, the pawl is withdrawn from the P gear under the action of a return spring (the spring force is generally small), the P gear is withdrawn and the P gear is withdrawn, then the pawl is kept away from the parking gear under the torque of the return spring until the P gear is advanced.

In the P range and normal driving process, there are two problems:

1. under normal conditions, if the return spring fails (torque decays) in the non-P gear (as in the state of fig. 10), the pawl may move towards the parking gear under the acceleration or vibration acceleration of the whole vehicle, so that unexpected P gear entering occurs (as in the state of fig. 11), or the pawl and the parking gear tooth striking phenomenon occurs (the parking gear rotates during normal running);

2. the park P and non-P position is typically determined by a sensor to confirm the rotational position of the rocker arm, or the axial position of the pushrod, rather than the position of the pawl. If the P gear is out, the reset spring fails, or the pawl does not exit the parking gear slot due to other reasons (such as jamming), and the sensor still transmits a non-P signal to the whole vehicle (the rocker and the push rod reach the non-P position), and at the moment, the position signal of the sensor is not matched with the actual position of the pawl, so that the fault occurs (as shown in fig. 11), and the working reliability is poor.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the present utility model provides a shift parking device for an automatic transmission, with the aim of improving the operational reliability.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: the automatic transmission gear shifting parking device comprises a parking pawl, a push rod assembly and a movable guide element arranged on the push rod assembly, wherein the guide element comprises a guide pin, and a guide groove for the guide pin to be inserted is formed in the parking pawl.

The guide element further comprises a mounting plate arranged on the push rod assembly, the guide pin is arranged on the mounting plate, and anti-rotation holes are formed in the mounting plate.

The push rod assembly comprises a push rod body, and a self-locking pin and a pre-tightening spring which are arranged on the push rod body, and the mounting plate is sleeved on the push rod body and is positioned between the self-locking pin and the pre-tightening spring.

The anti-rotation hole is a flat hole, the push rod body is provided with a limiting part matched with the shape of the anti-rotation hole, and the mounting plate is sleeved on the limiting part.

The mounting plate is of an L-shaped structure.

The axis of the guide pin is perpendicular to the axis of the push rod body.

According to the gear shifting and parking device of the automatic transmission, the guide element is arranged to be matched with the parking pawl, so that faults can be avoided, and the working reliability is improved.

Drawings

The present specification includes the following drawings, the contents of which are respectively:

FIG. 1 is a schematic view of the automatic transmission shift park apparatus of the present utility model in a P range position;

FIG. 2 is an enlarged view at A in FIG. 1;

FIG. 3 is a schematic view of the automatic transmission shift park apparatus of the present utility model in a non-P range position;

FIG. 4 is an enlarged view at B in FIG. 3;

FIG. 5 is an enlarged view of FIG. 3 at C;

FIG. 6 is a schematic structural view of a park pawl;

FIG. 7 is a schematic structural view of a pushrod assembly;

FIG. 8 is a schematic structural view of a guide member;

FIG. 9 is a schematic diagram of a prior art automatic transmission shift park apparatus;

FIG. 10 is a schematic view of a prior art automatic transmission shift park in a normal, non-P gear position;

FIG. 11 is a schematic view of a prior art automatic transmission shift park device in an abnormal non-P range position;

marked in the figure as: 1. a parking gear; 2. a parking pawl; 3. a return spring; 4. a detent pin; 5. a guide plate; 6. a push rod assembly; 7. a rocker arm assembly; 8. positioning leaf springs; 9. a pre-tightening spring; 10. a self-locking pin; 11. a mounting plate; 12. a guide pin; 13. anti-rotation holes; 14. a push rod body; 15. a guide groove.

Detailed Description

The following detailed description of the embodiments of the utility model, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate and thorough understanding of the concepts and aspects of the utility model, and to aid in its practice, by those skilled in the art.

As shown in fig. 1 to 8, the present utility model provides a gear shift parking device for an automatic transmission, comprising a detent pin 4, a parking gear 1, a guide plate 5, a rocker arm assembly 7, a positioning leaf spring 8, a parking pawl 2, a push rod assembly 6, and a guide member movably provided on the push rod assembly 6, the guide member comprising a guide pin 12, and the parking pawl 2 being provided with a guide groove 15 into which the guide pin 12 is inserted.

Specifically, as shown in fig. 1, the parking pawl 2 is rotatably disposed, one end of the parking pawl 2 is provided with a pawl pin 4, no return spring is disposed on the pawl pin 4, the other end of the parking pawl 2 is matched with a push rod assembly 6, the push rod assembly 6 is movably disposed on the guide plate 5, and the push rod assembly 6 is used for controlling the parking pawl 2 to rotate, so that the parking pawl 2 can lock the parking gear 1. The guide plate 5 is used for guiding the push rod assembly 6, the push rod assembly 6 comprises a push rod body 14, a self-locking pin 10 and a pre-tightening spring 9, the self-locking pin 10 and the pre-tightening spring 9 are arranged on the push rod body 14, and a guide hole for the push rod body 14 to pass through is formed in the guide plate 5. One end of the push rod body 14 is connected with the rocker arm assembly 7, the rocker arm assembly 7 is rotatably arranged, and the rotation center line of the rocker arm assembly 7 is parallel to the rotation center line of the parking pawl 2. The pretension spring 9 is a cylindrical spiral spring and is a compression spring, the pretension spring 9 is sleeved on the push rod body 14, the mounting plate 11 is clamped between the pretension spring 9 and the self-locking pin 10, and the pretension spring 9 applies elastic acting force to the mounting plate 11.

As shown in fig. 1, 7 and 8, the guiding element further comprises a mounting plate 11 arranged on the push rod assembly 6, the guiding pin 12 is arranged on the mounting plate 11, and an anti-rotation hole 13 is arranged on the mounting plate 11. The mounting plate 11 is sleeved on the push rod body 14 and is positioned between the self-locking pin 10 and the pre-tightening spring 9, the anti-rotation hole 13 is a flat hole, a limiting part matched with the anti-rotation hole 13 in shape is arranged on the push rod body 14, the mounting plate 11 is sleeved on the limiting part, and the limiting part can prevent the guide element from rotating circumferentially relative to the push rod body 14. The guide member is linearly movable only in the longitudinal direction of the push rod body 14 on the push rod body 14. The mounting plate 11 is L-shaped, the anti-rotation hole 13 is a through hole penetrating through the mounting plate 11 along the thickness direction of the mounting plate 11 at one end of the mounting plate 11, the guide pin 12 is fixedly connected with the mounting plate 11 at the other end of the mounting plate 11, and the axis of the guide pin 12 is vertical to the axis of the push rod body 14 in space. By adding the guide groove 15 on the parking pawl 2 and correspondingly adding the guide element on the push rod assembly 6, the guide element can be sleeved on the push rod body 14 through the small clearance fit of the flat hole, and the guide element can freely slide on the push rod body 14 and prevent rotating in the opposite mode. In practical application, the guide pin 12 is inserted into the guide groove 15, a small gap is designed, one end of the mounting plate 11 is matched with the end face of the self-locking pin 10, and the other end of the mounting plate 11 is matched with the end face of the pre-tightening spring 9.

As shown in fig. 1 and 2, one end of the guide pin 12 is fixedly connected with the mounting plate 11, the other end of the guide pin 12 is inserted into the guide groove 15, the guide groove 15 is a groove formed at the end of the parking pawl 2, the guide pin 12 and the guide groove 15 are in clearance fit, the width of the guide groove 15 is larger than the diameter of the guide pin 12, and the length of the guide groove 15 is larger than the diameter of the guide pin 12. When the vehicle is in the P range, the guide pin 12 is not in contact with the guide groove 15, the self-locking pin 10 is in contact with the parking pawl 2, the parking pawl 2 is embedded in the tooth slot of the parking gear 1, and the guide pin 12 is located at the first end of the guide groove 15 in the length direction.

When the vehicle goes out of the P gear, the rocker arm assembly 7 drives the push rod assembly 6 to linearly move, the guide pin 12 moves along with the push rod assembly 6 in the direction of the P gear, the self-locking pin 10 is separated from the parking pawl 2, if the parking pawl 2 does not exit from a tooth groove of the parking gear 1, the guide pin 12 is in contact with the guide groove 15 at the moment, under the action of the guide pin 12, the guide element drives the parking pawl 2 to rotate around the pawl pin 4 in the direction away from the parking gear 1, so that the parking pawl 2 exits from the tooth groove of the parking gear 1, and the function of exiting the P gear of the parking pawl 2 is realized. Because the pin and the groove can be regarded as rigid connection, the positions of the parking pawl 2 and the rocker arm assembly 7 can be ensured to be consistent, the sensor position signal is the actual position of the pawl, and the fault is avoided.

As shown in fig. 3 to 5, when the vehicle is in the non-P gear, the guide plate 5 is in small clearance fit with the push rod body 14 through the guide hole, so that the push rod assembly 6 and the guide pin 12 are ensured to be in the non-P gear position, and the parking pawl 2 is ensured to be always in the non-P gear position through the rigid connection of the pin and the groove, so that the whole vehicle acceleration or vibration acceleration is not considered, the possibility that the pawl is not expected to enter the P gear or the pawl is toothed is eliminated, and the fault hidden danger is eliminated. At this time, the guide pin 12 is located at a second end of the guide slot 15 in the length direction, the first end and the second end of the guide slot 15 are opposite ends of the guide slot 15 in the length direction, and a distance between the first end of the guide slot 15 and the axis of the parking gear 1 is greater than a distance between the second end of the guide slot 15 and the axis of the parking gear 1.

The automatic transmission gear shifting parking device with the structure has the following advantages:

1. through the cooperation of guide pin and groove, ensure that sensor position signal (rocking arm position) keeps unanimous with pawl position, eliminated the mismatch trouble of both positions that leads to because of reset spring inefficacy (torque decay) or jamming.

2. Through the rigid fit of the guide pin and the groove, the pawl is always in a far away position in the non-P gear, and the unexpected P feeding or pawl tooth striking phenomenon caused by vibration or whole vehicle acceleration when the return spring fails (torque is attenuated) is eliminated.

3. By adopting the structure, the reset spring part arranged on the pawl pin and corresponding matching features on the pawl can be eliminated.

The utility model is described above by way of example with reference to the accompanying drawings. It will be clear that the utility model is not limited to the embodiments described above. As long as various insubstantial improvements are made using the method concepts and technical solutions of the present utility model; or the utility model is not improved, and the conception and the technical scheme are directly applied to other occasions and are all within the protection scope of the utility model.

Claims

1. Automatic derailleur parking device that shifts, including parking pawl and push rod assembly, its characterized in that: the parking pawl is provided with a guide slot for inserting the guide pin;

the guide element further comprises a mounting plate arranged on the push rod assembly, the guide pin is arranged on the mounting plate, and an anti-rotation hole is formed in the mounting plate;

2. The automatic transmission shift parking device according to claim 1, characterized in that: the anti-rotation hole is a flat hole, the push rod body is provided with a limiting part matched with the shape of the anti-rotation hole, and the mounting plate is sleeved on the limiting part.

3. The automatic transmission shift parking device according to claim 1, characterized in that: the mounting plate is of an L-shaped structure.

4. The automatic transmission shift parking device according to claim 1, characterized in that: the axis of the guide pin is perpendicular to the axis of the push rod body.