CN115234651A

CN115234651A - Parking mechanism and automatic transmission with same

Info

Publication number: CN115234651A
Application number: CN202210761144.3A
Authority: CN
Inventors: 陈昌满; 史英哲; 宋建军; 丁万兴; 金星月
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-10-25

Abstract

The invention provides a parking mechanism and an automatic transmission with the same, comprising: the hydraulic cylinder body is provided with a mounting cavity and a first mounting hole communicated with the mounting cavity; the parking piston comprises a main body part and a connecting part which are mutually connected, and when the main body part is positioned at a parking position, one end of the main body part close to the connecting part is abutted against one end of the mounting cavity; when the main body part is located at the unlocking position, one end of the main body part, which is far away from the connecting part, is abutted against the other end of the mounting cavity; the limiting structure is arranged in the mounting cavity and has a first limiting state and a second limiting state; when the parking piston is in the parking position, one end of the abutting part, which is far away from the connecting part, is in abutting fit with at least part of the limiting structure; and/or when the parking piston is in the unlocking position, one end of the abutting part close to the connecting part is in abutting fit with at least part of the limiting structure. Through the technical scheme provided by the invention, the technical problem that the parking or unlocking of the parking mechanism in the prior art is unstable can be solved.

Description

Parking mechanism and automatic transmission with same

Technical Field

The invention relates to the technical field of automobile transmissions, in particular to a parking mechanism and an automatic transmission with the parking mechanism.

Background

At present, with the rapid development of the automobile industry, transmissions are continuously updated and upgraded, and automatic transmissions play an important role in the field of transmissions. The parking mechanism is an important component of the automatic transmission of the automobile, and the parking mechanism enables the automobile to be static and incapable of rolling on a plane or a road surface with a certain gradient. Different from a hand brake, the parking mechanism directly stops the gear in the transmission, so that the parking safety of the automobile with the parking mechanism is greatly improved. The conventional parking mechanism in the prior art mainly comprises a mechanical type, a motor type and a hydraulic type, and the hydraulic type parking mechanism is widely applied because of safety, reliability and simple operation.

The hydraulic parking mechanism in the prior art comprises a hydraulic parking push rod assembly, a parking arm and a parking gear sleeved on an input shaft; the hydraulic parking push rod assembly mainly comprises a hydraulic cylinder and a parking piston arranged in the hydraulic cylinder, the parking piston is fixedly connected to a pull rod, and a parking cam used for being in contact with a parking arm is sleeved at one end, extending out of the hydraulic cylinder, of the pull rod; the hydraulic cylinder is provided with a through hole for installing a piston locking pin, the parking piston is provided with a locking hole, and the piston locking pin is controlled by an electromagnet arranged outside the hydraulic cylinder.

However, in the hydraulic parking mechanism in the prior art, the piston rod abuts against the parking arm through the wedge-shaped surface, and during operation, the piston rod is driven to axially slide in the gearbox housing by using oil pressure or spring elasticity, and then the wedge-shaped surface is used for pressing the parking arm to swing so as to be engaged with the parking gear. The stability of above-mentioned structure when parking and unblock is not high, and then has reduced hydraulic pressure parking mechanism's performance.

Disclosure of Invention

The invention mainly aims to provide a parking mechanism and an automatic transmission with the same, and aims to solve the technical problem that the parking or unlocking of the parking mechanism in the prior art is unstable.

In order to achieve the above object, according to an aspect of the present invention, there is provided a parking mechanism including: the hydraulic cylinder body is provided with a mounting cavity and a first mounting hole communicated with the mounting cavity;

a parking piston having a parking position and an unlocking position; the parking piston comprises a main body part and a connecting part which are connected with each other, the main body part is movably arranged in the mounting cavity, the connecting part is movably arranged in the first mounting hole in a penetrating mode, and the connecting part is used for being connected with the parking arm; when the main body part is in the parking position, one end of the main body part, which is close to the connecting part, is abutted against one end of the mounting cavity; when the main body part is located at the unlocking position, one end, far away from the connecting part, of the main body part is abutted against the other end of the mounting cavity;

the limiting structure is arranged in the mounting cavity and has a first limiting state and a second limiting state;

the main body part is provided with an abutting part which is abutted and matched with the limiting structure, and the abutting part extends along the extending direction of the main body part;

when the parking piston is in the parking position, one end of the abutting part, which is far away from the connecting part, is in abutting fit with at least part of the limiting structure; and/or when the parking piston is in the unlocking position, one end of the abutting part close to the connecting part is in abutting fit with at least part of the limiting structure.

Furthermore, the main body part is provided with an accommodating cavity which extends along the extending direction of the connecting part; the butt joint portion is arranged on the inner wall of the accommodating cavity and protrudes out of the inner wall of the accommodating cavity, and the limiting structure is arranged in the accommodating cavity.

Further, limit structure includes:

the first limiting piece is movably arranged along the extending direction of the main body part, a limiting groove is arranged on the first limiting piece, and the limiting groove is arranged opposite to the abutting part;

the second limiting piece is matched with the limiting groove in shape, is movably arranged along the extending direction vertical to the main body part and is provided with a limiting position and an avoiding position; when the second limiting piece is positioned at the avoidance position, the first limiting piece moves to the position, opposite to the second limiting piece, of the limiting groove, so that the second limiting piece falls into the limiting groove and avoids the abutting part; when the second limiting part is located at the limiting position, the first limiting part moves to the position where the limiting groove and the second limiting part are staggered, so that the second limiting part is separated from the limiting groove and abuts and is limited on the abutting part.

Furthermore, a second mounting hole communicated with the mounting cavity is formed in the hydraulic cylinder body, and the second mounting hole and the first mounting hole are respectively located at two ends of the hydraulic cylinder body; the parking mechanism further includes:

the driving piece is installed at the second installation hole and is in driving connection with the first limiting piece so as to drive the first limiting piece to move along the extending direction of the main body part.

Furthermore, the first limiting part is made of a magnetic material, and the driving part is of an electromagnet structure so as to drive the first limiting part to move under the magnetic action force of the electromagnet structure and the first limiting part.

Further, the driving member includes:

the driving main body is plugged at the second mounting hole;

the guide part is connected with the driving main body, the guide part is installed in the installation cavity, the guide part extends along the extension direction of the main body part, and the first limiting part is installed on the guide part and moves along the extension direction of the guide part.

Further, the guide portion includes:

the guide post is arranged at one end, close to the main body part, of the driving main body, a guide channel matched with the guide post is arranged on the first limiting piece, and at least part of the guide post is inserted into the guide channel so as to guide the first limiting piece;

the annular guide piece is installed at one end, close to the main body portion, of the driving main body, the guide column is located in the annular guide piece, and the shape of the inner ring of the annular guide piece is matched with that of the first limiting piece so that the first limiting piece can be guided through the annular guide piece.

Furthermore, the annular guide piece is provided with a limiting hole, and the limiting hole is matched with the shape of the second limiting piece, so that the second limiting piece enters the limiting groove through the limiting hole or is separated from the limiting groove.

Further, the parking piston further includes:

the sealing bulge protrudes out of the outer edge of the main body part and is used for being attached to the inner wall of the installation cavity so as to separate the installation cavity through the sealing bulge.

Further, the parking mechanism further includes:

the annular sealing element is arranged between the inner wall of the mounting cavity and the main body part, the annular sealing element is positioned at one end of the mounting cavity, which is far away from the first mounting hole, and the annular sealing element and the sealing bulge are arranged at intervals so that the annular sealing element, the main body part and the sealing bulge enclose an oil liquid channel; and/or the presence of a gas in the atmosphere,

the reset piece is sleeved on the main body portion, one end of the reset piece abuts against the sealing protrusion, and the other end of the reset piece abuts against the end wall of the mounting cavity.

According to another aspect of the present invention, there is provided an automatic transmission including the parking mechanism provided above.

By applying the technical scheme of the invention, when the parking piston is in the parking position, one end of the abutting part, which is far away from the connecting part, is in abutting fit with at least part of the limiting structure, so that the stability of the parking piston in the parking position can be improved conveniently; because when the parking piston is in the unblock position, the one end that butt portion is close to connecting portion cooperates with the at least partial butt of limit structure, can be convenient for improve the stability of parking piston in the unblock position.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram illustrating a parking piston of a parking mechanism in a parking position according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram illustrating a parking piston of a parking mechanism provided in accordance with an embodiment of the present invention in a position between a parking position and an unlocked position;

FIG. 3 is a schematic structural diagram illustrating a parking piston of the parking mechanism in an unlocked position according to an embodiment of the present invention;

FIG. 4 is a schematic diagram illustrating a process for unlocking the parking mechanism according to an embodiment of the present invention;

fig. 5 shows a parking flow diagram of the parking mechanism provided according to the embodiment of the invention.

Wherein the figures include the following reference numerals:

10. a hydraulic cylinder block; 11. a mounting cavity; 12. an oil hole;

20. a parking piston; 21. a main body portion; 211. an accommodating chamber; 22. a connecting portion; 221. connecting grooves; 23. an abutting portion; 24. sealing the protrusion;

30. a limiting structure; 31. a first limit piece; 311. a limiting groove; 32. a second limiting member;

40. a drive member; 41. a drive body; 42. a guide portion; 421. a guide post; 422. an annular guide member;

50. an annular seal;

60. an oil passage;

70. a reset member;

80. and (5) sealing rings.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 3, a parking mechanism according to a first embodiment of the present invention includes a hydraulic cylinder 10, a parking piston 20, and a limiting structure 30, having a mounting cavity 11 and a first mounting hole communicating with the mounting cavity 11; the parking piston 20 has a parking position and an unlocking position; the parking piston 20 comprises a main body part 21 and a connecting part 22 which are connected with each other, the main body part 21 is movably arranged in the mounting cavity 11, the connecting part 22 is movably arranged in the first mounting hole in a penetrating mode, and the connecting part 22 is used for being connected with a parking arm; when the main body 21 is in the parking position, one end of the main body 21 close to the connecting portion 22 abuts one end of the mounting cavity 11; when the main body portion 21 is in the unlock position, one end of the main body portion 21 away from the connection portion 22 abuts the other end of the mounting cavity 11. Limiting structure 30 is installed in installation cavity 11, and limiting structure 30 has first spacing state and second spacing state. The main body 21 is provided with an abutting portion 23 which is in abutting engagement with the stopper structure 30, and the abutting portion 23 extends in the extending direction of the main body 21.

Specifically, when the parking piston 20 is in the parking position, an end of the abutment 23 remote from the connecting portion 22 is in abutting engagement with at least part of the limit structure 30. Alternatively, when the parking piston 20 is in the unlocked position, an end of the abutment 23 near the connecting portion 22 is in abutting engagement with at least part of the stopper structure 30. Or, when the parking piston 20 is in the parking position, one end of the abutting portion 23 far away from the connecting portion 22 is in abutting fit with at least part of the limiting structure 30; and when the parking piston 20 is in the unlocked position, an end of the abutment 23 adjacent to the connecting portion 22 is in abutting engagement with at least part of the limit structure 30.

By adopting the parking mechanism provided by the embodiment, when the parking piston 20 is in the parking position, one end of the abutting part 23, which is far away from the connecting part 22, is in abutting fit with at least part of the limiting structure 30, so that the stability of the parking piston 20 in the parking position can be improved, the situation that the parking piston 20 is in the parking position and is in position deviation can be avoided, and further, the situation that the parking is in failure can be avoided, and the service performance of the parking mechanism is improved.

In the present embodiment, the main body portion 21 is provided with a receiving cavity 211, and the receiving cavity 211 extends along the extending direction of the connecting portion 22. The abutting portion 23 is disposed on the inner wall of the accommodating cavity 211 and protrudes from the inner wall of the accommodating cavity 211, and the limiting structure 30 is installed in the accommodating cavity 211. By adopting the structure, the structural layout of the main body part 21 can be optimized conveniently, the compactness of the structural layout is improved, and the occupied volume of the whole structure is reduced.

Specifically, the abutting portion 23 in the present embodiment is an abutting projection, and the abutting projection and the main body portion 21 are integrally formed. By adopting the structure, the structure is simple, the production and the manufacture are convenient, and the connection reliability of the abutting projection and the main body part 21 is effectively ensured.

In this embodiment, the limiting structure 30 includes a first limiting member 31 and a second limiting member 32, the first limiting member 31 is movably disposed along the extending direction of the main body 21, a limiting groove 311 is disposed on the first limiting member 31, and the limiting groove 311 is disposed opposite to the abutting portion 23. The second limiting member 32 is matched with the shape of the limiting groove 311, the second limiting member 32 is movably arranged along the extending direction perpendicular to the main body portion 21, and the second limiting member 32 has a limiting position and an avoiding position; when the second limiting member 32 is at the avoidance position, the first limiting member 31 moves to a position where the limiting groove 311 is opposite to the second limiting member 32, so that the second limiting member 32 falls into the limiting groove 311 and avoids the abutting portion 23; when the second limiting member 32 is located at the limiting position, the first limiting member 31 moves to a position where the limiting groove 311 and the second limiting member 32 are dislocated, so that the second limiting member 32 is separated from the limiting groove 311 and abuts and limits the abutting portion 23. Adopt such structure setting, can be convenient for realize carrying out the position department of butt respectively to the both ends of butt portion 23 through the cooperation of first locating part 31 and second locating part 32, the butt is reliable, is convenient for cooperate the butt effect with the different positions that parking piston 20 was in to be convenient for effectively improve the stability that parking piston 20 was in parking position or unblock position. Particularly, the structure is simple, the installation is convenient, the space structure layout is optimized, and the structure layout is compact.

Specifically, the first limiting member 31 may be provided with a plurality of limiting grooves 311, the plurality of limiting grooves 311 are arranged at intervals along the circumferential direction of the first limiting member 31, the second limiting members 32 are correspondingly provided with a plurality of liquid levels, the plurality of second limiting members 32 and the plurality of limiting grooves 311 are arranged in a one-to-one correspondence manner, and each second limiting member 32 and the corresponding limiting groove 311 are arranged in a limiting manner. The abutting projection in the embodiment is an annular projection structure. The limiting groove 311 may be an arc-shaped groove structure, and the second limiting member 32 may be a limiting ball. Preferably, there are two limiting grooves 311 in this embodiment, the two limiting grooves 311 are symmetrically disposed on the periphery of the first limiting member 31, the two second limiting members 32 are disposed, the two second limiting members 32 and the two limiting grooves 311 are disposed in one-to-one correspondence, and each second limiting member 32 and the corresponding limiting groove 311 are disposed in a limiting manner.

Specifically, the hydraulic cylinder 10 in this embodiment is provided with a second mounting hole communicated with the mounting cavity 11, the second mounting hole and the first mounting hole are respectively located at two ends of the hydraulic cylinder 10, the parking mechanism further includes a driving element 40, the driving element 40 is mounted at the second mounting hole, and the driving element 40 is drivingly connected to the first limiting element 31 to drive the first limiting element 31 to move along the extending direction of the main body portion 21. By adopting the structure, the driving element 40 can drive the first limiting part 31 to move to the position where the limiting groove 311 and the second limiting part 32 are oppositely arranged or the limiting groove 311 and the second limiting part 32 are arranged in a staggered manner, so that the position of the first limiting part 31 can be conveniently adjusted, the positions where the two ends of the second limiting part 32 and the two ends of the abutting part 23 are respectively abutted can be conveniently realized by adjusting the first limiting part 31, and the stability of the parking position or the unlocking position can be improved. Specifically, the driving member 40 may be an electric push rod structure, and the driving distance of the electric push rod is controlled to control the first limiting member 31 to move to a position where the limiting groove 311 and the second limiting member 32 are oppositely arranged or the limiting groove 311 and the second limiting member 32 are arranged in a staggered manner, so as to conveniently control and adjust the position of the first limiting member 31.

In the present embodiment, the first position-limiting member 31 is made of a magnetic material, and the driving member 40 is an electromagnet structure, so as to drive the first position-limiting member 31 to move under the magnetic force of the electromagnet structure and the first position-limiting member 31. With this arrangement, the position of the first limiting member 31 can be adjusted by controlling the driving member 40. Specifically, when the first limiting member 31 needs to move in a direction close to the driving member 40, a current in one direction is applied to the driving member 40, and the magnitude and the working time of the current are controlled according to the position offset of the first limiting member 31; when the first limiting member 31 needs to move in a direction away from the driving member 40, a current direction opposite to the current direction is applied to the driving member 40, and the magnitude of the current and the working time are controlled according to the position offset of the first limiting member 31. The structure is simple, operation and control are convenient, and the position of the first limiting part 31 can be adjusted only by controlling the working condition of the electromagnet structure.

Specifically, the second limiting member 32 in the present embodiment may also be made of a magnetic material, so that the second limiting member 32 can smoothly return to the limiting groove 311.

Specifically, the driving member 40 includes a driving body 41 and a guide portion 42, and the driving body 41 is plugged at the second mounting hole. The guide portion 42 is connected to the driving body 41, the guide portion 42 is installed in the installation cavity 11, the guide portion 42 extends in the extending direction of the body portion 21, and the first stopper 31 is installed on the guide portion 42 and moves in the extending direction of the guide portion 42. By adopting the structure, the movement of the first limiting part 31 can be guided conveniently, the movement stability of the first limiting part 31 is improved, the first limiting part 31 can move stably along the extending direction of the main body part 21, and the situation that the first limiting part 31 is shifted in the movement process is avoided.

In this embodiment, the guiding portion 42 includes a guiding column 421 and a ring-shaped guiding member 422, the guiding column 421 is installed at one end of the driving body 41 close to the main body portion 21, a guiding channel adapted to the guiding column 421 is provided on the first limiting member 31, and at least a portion of the guiding column 421 is inserted in the guiding channel to guide the first limiting member 31. An annular guide 422 is mounted at one end of the driving body 41 close to the body portion 21, the guide column 421 is located in the annular guide 422, and the shape of the inner ring of the annular guide 422 is matched with the shape of the first limiting member 31, so that the first limiting member 31 is guided by the annular guide 422. With such a configuration, the first limiting member 31 can be stably moved along the extending direction of the main body 21 by the cooperation of the guide column 421 and the guide channel, and the annular guide 422 can position the exterior of the first limiting member 31, so as to further improve the stability of the first limiting member 31 moving along the extending direction of the main body 21. Therefore, the state of the second limiting member 32 can be switched by changing the position of the first limiting member 31, so that the second limiting member 32 can be switched to the positions respectively abutted against the two ends of the abutting portion 23.

Specifically, the annular guide 422 in this embodiment is provided with a limiting hole, and the limiting hole is adapted to the shape of the second limiting member 32, so that the second limiting member 32 enters the limiting groove 311 through the limiting hole or is separated from the limiting groove 311. By adopting the structure, the limiting stability of the second limiting part 32 can be further improved, the situation that the second limiting part 32 is easy to shift to cause limiting instability is avoided, and the limiting stability of the parking piston 20 is further improved.

Preferably, in order to facilitate the position limiting of the first limiting member 31, a first limiting protrusion may be disposed on the guiding column 421 or the annular guiding member 422, and a second limiting protrusion may be formed at an end of the guiding channel of the first limiting member 31, so as to effectively limit the position of the first limiting member 31 at different positions.

In this embodiment, the parking piston 20 further includes a sealing protrusion 24, the sealing protrusion 24 is disposed to protrude from an outer edge of the main body portion 21, and the sealing protrusion 24 is configured to be attached to an inner wall of the mounting cavity 11, so as to partition the mounting cavity 11 by the sealing protrusion 24. With the adoption of the structure, the installation cavity 11 can be conveniently sealed and separated through the sealing bulge 24, and the installation cavity 11 is separated into different areas, so that different structures can be conveniently installed.

Specifically, the parking mechanism further comprises an annular sealing element 50, the annular sealing element 50 is installed between the inner wall of the installation cavity 11 and the main body portion 21, the annular sealing element 50 is located at one end, far away from the first installation hole, of the installation cavity 11, and the annular sealing element 50 and the sealing protrusion 24 are arranged at intervals, so that the annular sealing element 50, the main body portion 21 and the sealing protrusion 24 enclose the oil channel 60. Or, the parking mechanism further comprises a resetting piece 70, the resetting piece 70 is sleeved on the main body part 21, one end of the resetting piece 70 abuts against the sealing bulge 24, and the other end of the resetting piece 70 abuts against the end wall of the mounting cavity 11. Or, the parking mechanism further comprises an annular sealing element 50 and a resetting element 70, wherein the annular sealing element 50 is installed between the inner wall of the installation cavity 11 and the main body part 21, the annular sealing element 50 is located at one end of the installation cavity 11 far away from the first installation hole, and the annular sealing element 50 and the sealing protrusion 24 are arranged at intervals, so that the annular sealing element 50, the main body part 21 and the sealing protrusion 24 enclose the oil channel 60; the reset piece 70 is sleeved on the main body part 21, one end of the reset piece 70 abuts against the sealing bulge 24, and the other end of the reset piece 70 abuts against the end wall of the mounting cavity 11.

Preferably, the parking mechanism in this embodiment further includes an annular sealing member 50 and a reset member 70, the annular sealing member 50 is installed between the inner wall of the installation cavity 11 and the main body portion 21, the annular sealing member 50 is located at an end of the installation cavity 11 far away from the first installation hole, the annular sealing member 50 is spaced from the sealing protrusion 24, so that the annular sealing member 50, the main body portion 21 and the sealing protrusion 24 enclose the oil passage 60, so as to seal the oil passage 60 through the annular sealing member 50 and the sealing protrusion 24, and prevent the oil in the oil passage 60 from entering other portions and damaging structures of other portions. The reset piece 70 is sleeved on the main body part 21, one end of the reset piece 70 abuts against the sealing bulge 24, and the other end of the reset piece 70 abuts against the end wall of the mounting cavity 11, so that the parking piston 20 is reset to the unlocking position.

Specifically, the restoring member 70 in the present embodiment may be a restoring spring.

In order to facilitate the introduction of oil into the oil passage 60, an oil hole 12 is formed in the side wall of the hydraulic cylinder 10, so that external oil enters the oil passage 60 through the oil hole 12 and pushes the parking piston 20 to move to the parking position, or the oil in the oil passage 60 flows out through the oil hole 12 and returns to the avoidance position under the resetting action of the resetting member 70.

In order to further improve the sealing performance, a sealing ring 80 is further sleeved on the sealing protrusion 24, and the sealing ring 80 is located between the sealing protrusion 24 and the inner wall of the installation cavity 11, so that the sealing performance of the oil passage 60 is further improved, and oil is prevented from entering other parts.

The parking piston 20 penetrates through a connecting hole of the hydraulic cylinder body 10 to be installed in the hydraulic cylinder body 10, the return spring is nested on the parking piston 20, the parking piston 20 is connected with a sealing ring 80 at a position of an internal connecting portion 22 of the hydraulic cylinder body 10, a sealing sleeve is arranged in a gap between the parking piston 20 and the hydraulic cylinder body 10 to seal, corresponding sealing is carried out on the locking electromagnet, and a parking arm connecting groove 221 of the parking piston 20 is connected with a parking arm to control parking and parking unlocking of the parking arm.

The electromagnet piston is arranged in the locking electromagnet, and the locking electromagnet controls the electromagnet piston to transversely reciprocate. The locking electromagnet is arranged in the hydraulic cylinder body 10, the locking ball is a small magnetic ball and is arranged among the electromagnet piston, the locking electromagnet and the parking piston 20, and the electromagnet piston provides electromagnetic force control to enable the locking ball to move up and down in the installation position.

The control method from the parking state, see fig. 1, unlocked by means of a hydraulic parking lock, to the parking lock, see fig. 3, is shown in fig. 4.

The TCU receives a parking unlocking signal, the hydraulic parking mechanism is shown in a parking state in figure 1, the TCU firstly sends a current signal to a locking electromagnet (the locking electromagnet is a driving part 40), the locking electromagnet pulls back an electromagnet piston (the electromagnet piston is a first limiting part 31) to enable the electromagnet piston to transversely move to be flush with a locking electromagnet hole position (corresponding to the locking electromagnet hole position level, so that the end part of the first limiting part 31 is abutted to the end part of the guide column 421), the locking electromagnet stops power transmission, the electromagnet piston stops moving, a locking ball (the locking ball is a second limiting part 32) enters the electromagnet piston hole position (the electromagnet piston hole position corresponds to a limiting groove 311) through electromagnetic force, the electromagnet piston hole position is a smooth arc curved surface, the locking ball is convenient to move up and down, and the locking of the parking piston 20 can be released. The TCU sends a current signal to the parking and unlocking electromagnetic valve again, the parking and unlocking electromagnetic valve controls the electronic oil pump, parking oil is injected from the oil hole 12, the parking oil pushes the parking piston 20 to move transversely, and the parking piston 20 pushes the parking arm connected with the parking arm connecting groove 221 to rotate, so that the parking state is gradually released. The parking oil pushes the parking piston 20 to the non-moving position and the parking is fully unlocked, see fig. 3. The TCU sends a current signal to the locking electromagnet again, the locking ball moves away from the position of the electromagnet piston hole through electromagnetic force and is clamped into a contact surface with the parking piston 20, the locking electromagnet pushes the electromagnet piston outwards to enable the electromagnet piston to move transversely, the parking piston 20 is locked, and parking unlocking is enabled to reach a stable state.

The control method from the parking-unlocked state, see fig. 3, by means of the hydraulic parking device to the parking state, see fig. 1, is shown in fig. 5. The TCU receives a parking signal, the hydraulic parking mechanism is in a parking unlocking state and is shown in figure 3, the TCU firstly sends a current signal to the locking electromagnet, the locking electromagnet pulls back the electromagnet piston to enable the electromagnet piston to move transversely to be flush with the hole position of the locking electromagnet, the locking electromagnet stops power transmission, the electromagnet piston stops moving, the locking ball enters the hole position of the electromagnet piston through electromagnetic force, and the locking of the parking piston 20 can be released. The return spring resets to enable parking oil to be leaked out of the oil hole, the return spring pushes the parking piston 20 to move transversely, the parking piston 20 pushes the parking arm connected with the parking arm connecting groove 221 to rotate so as to gradually enter a parking state, and the return spring pushes the parking piston 20 to be incapable of moving so as to achieve a completely stable parking state. The TCU sends a current signal to the locking electromagnet again, the locking ball moves away from the position of the electromagnet piston hole through electromagnetic force and is clamped into a contact surface with the parking piston 20, the locking electromagnet pushes the electromagnet piston outwards to enable the electromagnet piston to move transversely, the parking piston 20 is locked, and parking is stable.

The second embodiment of the invention provides an automatic transmission which comprises the parking mechanism provided by the first embodiment.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the parking and unlocking stability is improved, the spatial structure layout is optimized, and the compactness of the internal structure layout is improved.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "above … …", "above … …", "above … … upper surface", "above", etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, so that the scope of the present application is not to be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A parking mechanism, comprising:

the hydraulic cylinder body (10) is provided with a mounting cavity (11) and a first mounting hole communicated with the mounting cavity (11);

a parking piston (20), the parking piston (20) having a parking position and an unlocked position; the parking piston (20) comprises a main body part (21) and a connecting part (22) which are connected with each other, the main body part (21) is movably arranged in the mounting cavity (11), the connecting part (22) is movably arranged in the first mounting hole in a penetrating mode, and the connecting part (22) is used for being connected with a parking arm; when the main body part (21) is in the parking position, one end, close to the connecting part (22), of the main body part (21) is abutted against one end of the mounting cavity (11); when the main body part (21) is located at the unlocking position, one end, far away from the connecting part (22), of the main body part (21) is abutted against the other end of the mounting cavity (11);

the limiting structure (30) is installed in the installation cavity (11), and the limiting structure (30) has a first limiting state and a second limiting state;

the main body part (21) is provided with an abutting part (23) which is abutted and matched with the limiting structure (30), and the abutting part (23) extends along the extending direction of the main body part (21);

when the parking piston (20) is in the parking position, one end of the abutting part (23) far away from the connecting part (22) is in abutting fit with at least part of the limiting structure (30); and/or when the parking piston (20) is in the unlocking position, one end of the abutting part (23) close to the connecting part (22) is in abutting fit with at least part of the limiting structure (30).

2. Parking mechanism according to claim 1, characterized in that a housing cavity (211) is provided on the main body part (21), said housing cavity (211) extending in the extension direction of the connecting part (22); the abutting part (23) is arranged on the inner wall of the accommodating cavity (211) and protrudes out of the inner wall of the accommodating cavity (211), and the limiting structure (30) is installed in the accommodating cavity (211).

3. Parking mechanism according to claim 1, characterized in that said limit structure (30) comprises:

the first limiting piece (31), the first limiting piece (31) is movably arranged along the extending direction of the main body part (21), a limiting groove (311) is arranged on the first limiting piece (31), and the limiting groove (311) is arranged opposite to the abutting part (23);

the second limiting piece (32) is matched with the limiting groove (311) in shape, the second limiting piece (32) is movably arranged along the extending direction vertical to the main body part (21), and the second limiting piece (32) is provided with a limiting position and an avoiding position; when the second limiting piece (32) is at the avoidance position, the first limiting piece (31) moves to the position where the limiting groove (311) is opposite to the second limiting piece (32), so that the second limiting piece (32) falls into the limiting groove (311) and avoids the abutting part (23); when the second limiting member (32) is located at the limiting position, the first limiting member (31) moves to a position where the limiting groove (311) and the second limiting member (32) are dislocated, so that the second limiting member (32) is separated from the limiting groove (311) and abuts against and limits the abutting portion (23).

4. The parking mechanism according to claim 3, characterized in that the hydraulic cylinder (10) is provided with a second mounting hole communicating with the mounting cavity (11), the second mounting hole and the first mounting hole being located at both ends of the hydraulic cylinder (10), respectively; the parking mechanism further includes:

the driving piece (40) is installed at the second installation hole, and the driving piece (40) is in driving connection with the first limiting piece (31) so as to drive the first limiting piece (31) to move along the extending direction of the main body part (21).

5. The parking mechanism according to claim 4, wherein the first limiting member (31) is made of a magnetic material, and the driving member (40) is of an electromagnet structure so as to drive the first limiting member (31) to move under the magnetic force of the electromagnet structure and the first limiting member (31).

6. Parking mechanism according to claim 4, wherein the drive member (40) comprises:

the driving body (41), the driving body (41) is plugged at the second mounting hole;

the guide portion (42) is connected with the driving main body (41), the guide portion (42) is installed in the installation cavity (11), the guide portion (42) extends along the extending direction of the main body portion (21), and the first limiting piece (31) is installed on the guide portion (42) and moves along the extending direction of the guide portion (42).

7. The parking mechanism according to claim 6, characterized in that said guide portion (42) comprises:

the guide post (421) is installed at one end, close to the main body part (21), of the driving main body (41), a guide channel matched with the guide post (421) is arranged on the first limiting part (31), and at least part of the guide post (421) is inserted into the guide channel so as to guide the first limiting part (31);

the annular guide piece (422) is installed at one end, close to the main body part (21), of the driving main body (41), the guide column (421) is located in the annular guide piece (422), and the shape of the inner ring of the annular guide piece (422) is matched with that of the first limiting piece (31) so that the first limiting piece (31) can be guided through the annular guide piece (422).

8. The parking mechanism according to claim 7, wherein a limiting hole is formed in the annular guide (422), and the limiting hole is matched with the shape of the second limiting member (32) so that the second limiting member (32) enters the limiting groove (311) through the limiting hole or is separated from the limiting groove (311).

9. The parking mechanism according to claim 1, wherein the parking piston (20) further comprises a sealing protrusion (24), the sealing protrusion (24) is arranged to protrude from the outer edge of the main body portion (21), and the sealing protrusion (24) is used for being attached to the inner wall of the mounting cavity (11) so as to separate the mounting cavity (11) through the sealing protrusion (24); the parking mechanism further includes:

an annular sealing element (50) installed between the inner wall of the installation cavity (11) and the main body part (21), wherein the annular sealing element (50) is located at one end, away from the first installation hole, of the installation cavity (11), and the annular sealing element (50) is arranged at a distance from the sealing protrusion (24) so that the annular sealing element (50), the main body part (21) and the sealing protrusion (24) enclose an oil liquid channel (60); and/or the presence of a gas in the gas,

the reset piece (70) is sleeved on the main body portion (21), one end of the reset piece (70) abuts against the sealing bulge (24), and the other end of the reset piece (70) abuts against the end wall of the installation cavity (11).

10. An automatic transmission characterized by comprising the parking mechanism of any one of claims 1 to 9.