WO2022078478A1

WO2022078478A1 - Hydraulic control system for automatic transmission

Info

Publication number: WO2022078478A1
Application number: PCT/CN2021/123980
Authority: WO
Inventors: 毛泽贤; 唐立中; 赵雪松; 赵健涛; 宋建军; 梅相楠; 赵慧超; 康志军; 刘振宇
Original assignee: 中国第一汽车股份有限公司
Priority date: 2020-10-15
Filing date: 2021-10-15
Publication date: 2022-04-21
Also published as: CN112178184A; CN112178184B

Abstract

A hydraulic control system for an automatic transmission, the hydraulic control system comprising: a pilot pressure regulating valve (1); a gear operation structure comprising a pressure regulating valve; and a parking locking structure comprising an oil inlet slide valve (31), an oil outlet slide valve (32) and a parking locking assembly (33), the parking locking assembly comprising a pushing member (331), a stopping member (332), a housing (333) and a parking member (334), the parking member being connected to the pushing member, the pushing member partially extending into a chamber and dividing the chamber into a first chamber (33303) and a second chamber (33304), the stopping member being arranged in the first chamber, a first oil inlet cavity of the oil inlet slide valve being in communication with the pilot pressure regulating valve, and a second oil inlet of the oil outlet slide valve being capable of being in communication with a pipeline between the pressure regulating valve and the first oil inlet.

Description

Hydraulic control system for automatic transmission

This application claims the priority of the Chinese patent application with application number 202011104880.9 filed with the China Patent Office on October 15, 2020, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of hydraulic control of automatic transmissions, for example, to a hydraulic control system of automatic transmissions.

Background technique

In order to realize the hydraulic parking function (that is, to switch the vehicle to the parking gear), the hydraulic control system of the automatic transmission usually adopts a locking solenoid valve, at least one pressure regulating solenoid valve and multiple mechanical valves. The additional at least two solenoid valves not only The cost of the system is increased, and more ports of the automatic transmission control unit are occupied, which increases the difficulty of control.

SUMMARY OF THE INVENTION

The present application provides a hydraulic control system for an automatic transmission, which solves the problems of high system cost and difficult control caused by the large number of solenoid valves in the related art.

A hydraulic control system for an automatic transmission, comprising: a pilot pressure regulating valve; a gear operation structure, including a pressure regulating valve; a parking lock structure, including an oil inlet slide valve, an oil discharge slide valve and a parking lock assembly, The vehicle locking assembly includes a push piece, a stop piece, a housing with a cavity, and a parking piece, the parking piece is connected with the push piece, and the housing is provided with a connection with the cavity. A first communication port and a second communication port, part of the pusher extends into the chamber and divides the chamber into a first chamber and a second chamber, the stopper is provided on the first chamber In the chamber, the first oil inlet cavity of the oil inlet spool valve is communicated with the pilot pressure regulating valve, the first oil inlet of the oil inlet spool valve can be communicated with the pressure regulating valve, and the oil inlet spool valve is provided with There are a first working oil port and a first oil return port, and the oil in the first oil inlet chamber can push the oil inlet piston of the oil inlet spool valve to make the first working oil port and the first return port. The oil port or the first oil inlet is communicated, and the first working oil port can be communicated with the first communication port and the first oil discharge cavity of the oil discharge spool valve, and the second inlet of the oil discharge spool valve. The oil port can be communicated with the pipeline between the pressure regulating valve and the first oil inlet, the second communication port is communicated with the second working oil port of the oil discharge spool valve, and the first oil discharge The oil in the cavity can push the oil discharge piston of the oil discharge spool valve to make the second working oil port communicate with the second oil return port or the second oil inlet port of the oil discharge spool valve, and the first The oil in a chamber can push the stopper to move in a first direction to make the stopper abut or disengage from the pusher, and the oil in the second chamber can push the pusher The parking element is moved in a second direction to make the parking piece abut or disengage from the parking pawl, and the second direction and the first direction are arranged at an included angle.

As a solution of a hydraulic control system of an automatic transmission, the parking lock structure further includes a first check valve and a pressure maintaining valve, and the inlet of the first check valve is communicated with the first working oil port, The outlet of the first check valve is communicated with the first oil discharge chamber and the first pressure keeping chamber of the pressure keeping valve, the inlet of the pressure keeping valve is communicated with the outlet of the pressure regulating valve, the The outlet of the pressure-holding valve is communicated with the second oil inlet. When the first check valve is opened, the oil discharged from the first working oil port enters the first row through the first check valve. The oil chamber and the first pressure maintaining chamber, the oil discharged from the outlet of the pressure regulating valve can pass through the pressure maintaining valve, the second oil inlet, the second working oil port, and the second The communication port enters the second chamber.

As a solution for a hydraulic control system of an automatic transmission, the number of the pressure regulating valves is two, and the two pressure regulating valves are a first pressure regulating valve and a second pressure regulating valve respectively, and the parking lock structure It also includes a shuttle valve, the two inlets of the shuttle valve are respectively communicated with the first pressure regulating valve and the second pressure regulating valve, and the outlet of the shuttle valve is respectively connected with the first oil inlet and the second pressure regulating valve. The inlet of the pressure-retaining valve is connected.

As a solution of a hydraulic control system of an automatic transmission, when the vehicle switches between the first gear and the parking gear, one of the first pressure regulating valve and the second pressure regulating valve is connected to the shuttle valve. communicated with the oil inlet spool valve.

As a solution for a hydraulic control system of an automatic transmission, one of the stopper and the pusher is provided with a limit protrusion, and the other is provided with a groove matched with the limit protrusion, so The parking lock assembly includes: a reset elastic piece, the reset elastic piece is located in the first chamber, one end of the reset elastic piece is connected with the housing, and the other end is connected with the stop piece, so When the stopper is separated from the pusher, the reset elastic piece is compressed, and the reset elastic piece can reset the stopper, so that the limiting protrusion is located in the groove or the stopper is located. The moving piece is in contact with the end face of the pushing piece; an elastic piece is loaded, the elastic loading piece is sleeved on the pushing piece and is located outside the casing, and one end of the elastic loading piece is connected to the casing connected, the other end is connected to the pusher or the pusher, when the parking member is separated from the parking pawl, the loading elastic member is compressed, and the loading elastic member can push the pusher moving in the second direction, so that the pushing member drives the parking member to abut against the parking pawl.

As a solution of a hydraulic control system of an automatic transmission, the elastic force of the restoring elastic member is a first pressure when the stopper is separated from the pushing member, and the first pressure is the first pressure when the first check valve is opened. The difference between the inlet and outlet pressures of the check valve is the second pressure, and the second pressure is greater than the first pressure; when the limiting protrusion is located in the groove, the elastic force of the loading elastic member is the first pressure. Three pressures, the third pressure is greater than the first pressure, when the inlet and outlet of the pressure maintaining valve are connected, the elastic force of the pressure maintaining elastic member of the pressure maintaining valve is the fourth pressure, and the fourth pressure is lower than the the third pressure.

As a solution of a hydraulic control system of an automatic transmission, the parking lock assembly further includes a bushing, the bushing is located in the second chamber, and the pushing member is in sealing and sliding connection with the bushing, so The pusher divides the second chamber into an isolated exhaust chamber and an oil-liquid chamber, and a third communication port is also provided on the housing, and the third communication port communicates with the exhaust chamber , the second communication port communicates with the oil chamber.

As a solution of a hydraulic control system for an automatic transmission, the parking lock structure further includes a first oil tank and a second oil tank, the first oil tank is communicated with the first oil return port, and the second oil tank is connected to the first oil tank. The second oil return port is communicated.

As a solution of a hydraulic control system of an automatic transmission, the hydraulic control system of the automatic transmission further includes a low-pressure cooling and lubricating structure, and the low-pressure cooling and lubricating structure includes a first oil tank, a high-pressure oil pump, a high-pressure filter, a second A check valve and an accumulator, the low-pressure cooling and lubricating structure further comprises a switching valve, the inlet of the switching valve is communicated with the pipeline between the high-pressure filter and the second check valve, the switching valve When the power is off, the second check valve can be opened, and the high-pressure oil pump can charge the accumulator; when the switching valve is energized, the high-pressure oil pump can pass the oil in the first oil tank through The switching valve is pumped out, the high-pressure oil pump is depressurized, the second check valve is in a closed state, and the accumulator maintains pressure.

As a solution for a hydraulic control system of an automatic transmission, the low-pressure cooling and lubricating structure further includes a second oil tank, a low-pressure oil pump, a cooler, and a low-pressure filter connected in sequence, and the outlet of the low-pressure filter is connected to the cooling pipeline and the lubricating oil. The pipelines are connected, and one of the cooling pipeline and the lubricating pipeline is provided with a flow regulating valve, and the flow regulating valve is connected with the pilot pressure regulating valve.

Description of drawings

1 is a partial schematic diagram of a hydraulic control system of an automatic transmission provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of a hydraulic control system of an automatic transmission provided by an embodiment of the present application.

In the picture:

1. Pilot pressure regulating valve;

211, the first pressure regulating valve; 212, the odd clutch pressure regulating valve; 213, the odd emergency oil drain spool valve; 214, the first odd gear shift valve; 215, the second odd gear shift valve; 221, the second pressure regulating valve ; 222, even-numbered clutch pressure regulating valve; 223, even-numbered emergency oil drain spool valve; 224, first even-numbered shift valve; 225, second even-numbered shift valve;

31, oil inlet slide valve; 32, oil discharge slide valve; 33, parking lock assembly; 331, pusher; 3310, groove; 332, stopper; 3321, limit protrusion; 333, housing; 33301, 33302, the second communication port; 33303, the first chamber; 33304, the second chamber; 33305, the third communication port; 334, the parking part; 335, the reset elastic part; 336, the loading elastic part ;337, Parking push-pull rod; 338, Parking elastic part; 339, Bushing; 34, First check valve; 35, Pressure maintaining valve; 36, Shuttle valve; 37, First fuel tank; 38, Second fuel tank ;

41, the first oil tank; 42, the high pressure oil pump; 43, the high pressure filter; 44, the second check valve; 45, the accumulator; 46, the switching valve; 47, the safety valve; 48, the pressure sensor;

51, second oil tank; 52, low pressure oil pump; 53, cooler; 54, low pressure filter; 55, cooling pipeline; 56, lubrication pipeline; 57, flow regulating valve; 58, suction filter; 59, pressure relief valve ; 510, bypass valve.

Detailed ways

The technical solutions of the embodiments of the present application will be described below with reference to the accompanying drawings, and the described embodiments are only a part of the embodiments of the present application.

In the description of this application, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. refer to the orientation or position The relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore It should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance. Therein, the terms "first position" and "second position" are two different positions.

In the description of this application, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection; it may be a mechanical connection, It can also be an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two components. For those of ordinary skill in the art, the meanings of the above terms in the present application can be understood according to the situation.

As shown in FIG. 1 and FIG. 2 , the present embodiment provides a hydraulic control system for an automatic transmission, including a pilot pressure regulating valve 1 , a gear operating structure and a parking lock structure. The gear operating structure includes a pressure regulating valve, and the parking The vehicle locking structure includes an oil inlet spool valve 31, an oil discharge spool valve 32 and a parking lock assembly 33. The parking lock assembly 33 includes a pusher 331, a stopper 332, a housing 333 with a chamber and a parking element 334, the parking member 334 is connected with the push member 331, the housing 333 is provided with a first communication port 33301 and a second communication port 33302 that communicate with the chamber, and part of the push member 331 extends into the chamber and divides the chamber into a first communication port 33301 and a second communication port 33302. A chamber 33303 and a second chamber 33304, the stopper 332 is arranged in the first chamber 33303, the first inlet chamber of the oil inlet spool valve 31 is communicated with the pilot pressure regulating valve 1, and the first inlet of the oil inlet spool valve 31 is communicated with the pilot pressure regulating valve 1. The oil port can be communicated with the pressure regulating valve, the oil inlet spool valve 31 is provided with a first working oil port and a first oil return port, and the oil in the first oil inlet chamber can push the oil inlet piston of the oil inlet spool valve 31 to make the first oil inlet A working oil port is communicated with the first oil return port or the first oil inlet port, and the first working oil port can be communicated with the first communication port 33301 and the first oil discharge cavity of the oil discharge slide valve 32 respectively. The second oil inlet can be communicated with the pipeline between the pressure regulating valve and the first oil inlet, the second communication port 33302 can be communicated with the second working oil port of the oil discharge slide valve 32, and the oil in the first oil discharge chamber can Push the oil discharge piston of the oil discharge spool valve 32 to make the second working oil port communicate with the second oil return port or the second oil inlet port of the oil discharge spool valve 32, the oil in the first chamber 33303 can push the stopper 332 Moving in the first direction to make the stopper 332 abut or disengage from the pusher 331, the oil in the second chamber 33304 can push the pusher 331 to move in the second direction to make the parking member 334 and the parking pawl Abutting or disengaging, the second direction and the first direction are arranged at an included angle.

The push member 331 includes a push rod and a piston. The piston is fixedly mounted on the push rod and can be sealed and slidably connected to the inner wall of the chamber. A joint is provided on the pipeline between the second discharge port of the oil drain slide valve 32 and the second chamber 33304. The additional orifice can control the movement speed of the pusher 331 to prevent the speed from hitting the housing 333 too fast to generate noise.

The dashed lines in Figures 1 and 2 represent the hydraulic pipelines that control each valve, and the working state of each valve is changed by adjusting the pressure of the oil in the hydraulic pipeline to switch the state of the valve. In this embodiment, the first oil inlet is the P port of the oil inlet spool valve 31 in FIG. 1 , the first working oil port is the A port of the oil inlet spool valve 31 in FIG. 1 , and the first oil return port is the oil inlet spool valve in FIG. 1 . The T port of 31, the second oil inlet is the P port of the oil drain spool valve 32 in Fig. 1, the second working oil port is the A port of the oil drain spool valve 32 in Fig. 1, and the second oil return port is the oil drain valve in Fig. 1 Port A T port of valve 32.

The first direction of this embodiment is the vertical direction as shown in FIG. 1 . When the stopper 332 is gradually disengaged from the pusher 331 , the stopper 332 moves downward in the vertical direction; When the pusher 331 abuts, the stopper 332 moves upward in the vertical direction. The second direction in this embodiment is the horizontal direction as shown in FIG. 1 , and the included angle between the first direction and the second direction is 90°. When the parking member 334 gradually contacts the parking pawl, the pushing member 331 moves along The horizontal direction moves to the right, and when the parking member 334 is gradually disengaged from the parking pawl, the push member 331 moves to the left in the horizontal direction. In other embodiments, the first direction and the second direction are not limited to the limitations of this embodiment, and may also be other directions, and the first direction and the second direction can be set according to actual needs.

In the hydraulic control system of the automatic transmission provided by this embodiment, the added oil inlet slide valve 31 and the oil discharge slide valve 32 are both mechanical valves, and the oil inlet slide valve 31 and the oil discharge slide valve 32 are controlled by the pilot pressure regulating valve 1 to realize the hydraulic parking function The production cost is reduced, and the control difficulty is reduced.

As shown in FIG. 1 , the parking lock structure of this embodiment further includes a first check valve 34 and a pressure maintaining valve 35 . The inlet of the first check valve 34 is communicated with the first working oil port, and the first check valve The outlet of 34 is communicated with the first oil discharge chamber and the first pressure keeping chamber of the pressure keeping valve 35 respectively, the inlet of the pressure keeping valve 35 is communicated with the outlet of the pressure regulating valve, and the outlet of the pressure keeping valve 35 is communicated with the second oil inlet , when the first check valve 34 is opened, the oil discharged from the first working oil port enters the first oil discharge chamber and the first pressure holding chamber respectively through the first check valve 34, and the oil discharged from the outlet of the pressure regulating valve can It enters the second chamber 33304 through the pressure maintaining valve 35 , the second oil inlet port, the second working oil port, and the second communication port 33302 in sequence.

The operation process of engaging the park gear is as follows:

First, adjust the output pressure of the pilot pressure regulating valve 1, so that the oil entering the first oil chamber of the oil inlet spool valve 31 pushes the oil inlet spool valve 31 to switch from the basic position to the non-basic position, and at the same time the oil discharged from the outlet of the pressure regulating valve The hydraulic pressure changes. At this time, the P port of the oil inlet spool valve 31 is connected to the A port of the oil inlet spool valve 31, and the oil in the A port of the oil inlet spool valve 31 enters the first chamber 33303 through the first communication port 33301. The A port of the valve 32 is communicated with the T port of the oil discharge slide valve 32. The stopper 332 moves downward in the first direction to separate the stopper 332 from the pusher 331. The oil in the second chamber 33304 can pass through the first direction. The two communication ports 33302 and the A port of the oil drain spool valve 32 reach the T port of the oil drain spool valve 32, the pushing member 331 moves to the right in the second direction to make the parking member 334 abut the parking pawl, and then the pilot pressure is adjusted The output pressure of the valve 1 is adjusted to switch the oil inlet spool valve 31 from the non-basic position to the basic position. The A port of the oil inlet spool valve 31 is connected to the T port of the oil inlet spool valve 31, and the oil in the first oil chamber can pass through the first oil chamber in turn. A communication port 33301 , the A port of the oil inlet spool valve 31 is discharged from the T port of the oil inlet spool valve 31 , the stopper 332 is reset and abuts the left end surface of the pusher 331 .

The operation process of removing the parking gear is as follows:

First, adjust the output pressure of the pilot pressure regulating valve 1, so that the oil entering the first oil chamber of the oil inlet spool valve 31 pushes the oil inlet spool valve 31 to switch from the basic position to the non-basic position, and at the same time the oil discharged from the outlet of the pressure regulating valve When the hydraulic pressure changes, the P port of the oil inlet spool valve 31 is connected to the A port of the oil inlet spool valve 31, and the oil in the A port of the oil inlet spool valve 31 enters the first chamber 33303 through the first communication port 33301, and the first chamber 33303 The oil pushes the stopper 332 downward in the first direction to separate the stopper 332 from the pusher 331, and the pusher 331 moves to the left in the second direction to separate the parking piece 334 from the parking pawl, At this time, the pressure of the oil discharged from the outlet of the pressure regulating valve increases, the first check valve 34 is opened, the inlet and outlet of the first check valve 34 are connected, and the oil in the second oil chamber can pass through the first check valve 34 respectively. Enter the first oil discharge chamber and the first pressure holding chamber, so that the second oil inlet of the oil discharge slide valve 32 can be connected to the second working oil port, and the inlet and outlet of the pressure holding valve 35 can be connected. At this time, the first check valve The oil pressure at the inlet of 34 is the same as the oil pressure at the inlet of the first check valve 34, so that the first check valve 34 is closed again, and the second oil inlet is communicated with the second working oil port and the pressure maintaining valve The inlet and outlet of 35 are connected, and the oil at the outlet of the pressure regulating valve can enter the second chamber 33304 through the pressure maintaining valve 35, the second oil inlet and the second working oil port in sequence, and the pusher 331 moves to the left in the second direction. In order to separate the parking member 334 from the parking pawl, when the push member 331 reaches the set position, the pilot pressure regulating valve 1 controls the oil pressure entering the first oil chamber, so that the oil inlet spool valve 31 is switched to the basic position, The oil in the first oil chamber can be discharged from the T port of the oil inlet spool valve 31 through the first communication port 33301 and the A port of the oil inlet spool valve 31 in sequence.

The above-mentioned basic position is the position of the valve core when there is no power supply or control pressure, and the non-basic position is the other position of the valve core when it is not in the basic position.

The opening pressure of the pressure maintaining valve 35 in this embodiment is the same as the opening pressure of the oil drain spool valve 32 and the opening pressure of the first check valve 34. When the pressure maintaining valve 35 is opened, the oil drain spool valve 32 and the first check valve 34 Also switches from the base position to the non-base position. As shown in FIG. 1 , the pressure maintaining valve 35 in this embodiment is a two-position two-way spool valve, the inlet of the pressure maintaining valve 35 is the P port of the pressure maintaining valve 35 in FIG. 1 , and the inlet of the pressure maintaining valve 35 is shown in FIG. 1 . The A port of the middle pressure maintaining valve 35, when the pressure maintaining valve 35 is in the closed state, the P port of the pressure maintaining valve 35 is not connected to the A port of the pressure maintaining valve 35, and when the pressure maintaining valve 35 is in the open state, the pressure maintaining valve 35 is in the open state. The P port of 35 communicates with the A port of the pressure maintaining valve 35 .

When the pilot pressure regulating valve 1 adjusts the pressure of the oil entering the first oil chamber to increase, so that the first oil inlet of the oil inlet spool valve 31 is connected with the first working oil port, if the inlet of the first check valve 34 is When the oil pressure of the first check valve 34 is greater than the oil pressure at the inlet of the first check valve 34 and the difference between the two reaches the pressure when the first check valve 34 is opened, the inlet and outlet of the first check valve 34 are connected, and the second oil The oil in the cavity can enter the first oil discharge cavity and the first pressure holding cavity respectively through the first check valve 34, so that the second oil inlet port of the oil discharge spool valve 32 can be communicated with the second working oil port, and the pressure holding valve The inlet and outlet of 35 can be communicated, and the oil pressure at the inlet of the first check valve 34 is the same as the oil pressure at the inlet of the first check valve 34, so that the first check valve 34 is closed again, and the second check valve 34 is closed again. The oil inlet is communicated with the second working oil port and the inlet and outlet of the pressure maintaining valve 35 are communicated. The oil at the outlet of the pressure regulating valve can enter the second working oil port through the pressure maintaining valve 35, the second oil inlet port and the second working oil port in sequence. Chamber 33304.

As shown in FIG. 1 and FIG. 2 , the number of pressure regulating valves in this embodiment is two, and the two pressure regulating valves are the first pressure regulating valve 211 and the second pressure regulating valve 221 respectively, and the first pressure regulating valve 211 The main function of the pressure regulating valve 221 and the second pressure regulating valve 221 is to adjust the pressure by changing the oil pressure of the two outlets when engaging the clutch or shifting gears. The parking lock structure also includes a shuttle valve 36. The two inlets of the shuttle valve 36 are respectively It is communicated with the first pressure regulating valve 211 and the second pressure regulating valve 221, the outlet of the shuttle valve 36 is communicated with the first oil inlet, and the inlet of the pressure maintaining valve 35 is communicated with the first oil inlet and the inlet of the pressure maintaining valve 35 respectively. .

When the outlet pressure of the first pressure regulating valve 211 is greater than the outlet pressure of the second pressure regulating valve 221, the first pressure regulating valve 211 communicates with the shuttle valve 36, and when the outlet pressure of the second pressure regulating valve 221 is greater than the first pressure regulating valve At the outlet pressure of 211, the second pressure regulating valve 221 communicates with the shuttle valve 36, and the oil can only flow out from the first pressure regulating valve 211 or the second pressure regulating valve 221 through the shuttle valve 36, but cannot pass through the shuttle valve 36. The first pressure regulating valve 211 or the second pressure regulating valve 221 flows out.

When the vehicle of this embodiment switches between the first gear and the parking gear, one of the first pressure regulating valve 211 and the second pressure regulating valve 221 is communicated with the shuttle valve 36 and the oil inlet spool valve 31, and the first gear It is any one of the neutral gear, reverse gear, forward gear and sports gear of the vehicle. For example, in the present embodiment, when the neutral gear, the forward gear and the sports gear are switched with the parking gear, the first pressure regulating valve 211 is connected with the shuttle valve 36 and the oil inlet spool valve 31, and when the reverse gear is switched with the parking gear, the second The pressure regulating valve 221 communicates with the shuttle valve 36 and the oil inlet spool valve 31 . Of course, in other embodiments, the state in which the first pressure regulating valve 211 or the second pressure regulating valve 221 communicates with the shuttle valve 36 and the oil inlet spool valve 31 when the first gear is switched between the parking gear is not limited to this embodiment. This limitation of the example can also be other control strategies, but to ensure that when the first gear and the parking gear are switched, one of the first pressure regulating valve 211 and the second pressure regulating valve 221 is connected to the shuttle valve 36 and the oil inlet slip. The valve 31 communicates.

As shown in FIG. 1 , the stopper 332 in this embodiment is provided with a limit protrusion 3321 , and the pusher 331 is provided with a groove 3310 that cooperates with the limit protrusion 3321 , as shown in FIG. 1 , the parking lock The assembly 33 includes a reset elastic member 335 and a loading elastic member 336. Both the reset elastic member 335 and the loading elastic member 336 are springs. The reset elastic member 335 is located in the first chamber 33303, and one end of the reset elastic member 335 is connected to the housing 333. The other end is connected with the stopper 332. When the stopper 332 is separated from the pusher 331, the reset elastic piece 335 is compressed, and the reset elastic piece 335 can reset the stopper 332, so that the limiting protrusion 3321 is located in the groove 3310 or The stopper 332 is in contact with the end face of the pusher 331 , the loading elastic piece 336 is sleeved on the pusher 331 and is located outside the casing 333 , one end of the loading elastic piece 336 is connected with the casing 333 , and the other end is connected with the pusher 331 Or the pushing member 331 is connected, and when the parking member 334 is separated from the parking pawl, the loading elastic member 336 is compressed, and the loading elastic member 336 can push the pushing member 331 to move in the second direction, so that the pushing member 331 drives the parking member 334 abuts the parking pawl.

In this embodiment, the oil in the first chamber 33303 to push the pusher 331 must overcome the resultant force of the elastic member 336 and the force required to remove the stopper. Therefore, the first pressure regulating valve 211 or the second pressure regulating valve 221 The pressure of the oil at the outlet is greater than the opening pressure of the first check valve 34 .

In other embodiments, the pushing member 331 may also be provided with a limiting protrusion 3321, and the stopper 332 may be provided with a groove 3310 that cooperates with the limiting protrusion 3321, so as to realize the push member 331 and the stopper 332. abutment or separation.

As shown in FIG. 1 , the parking lock assembly 33 in this embodiment further includes a parking push-pull rod 337 , a parking elastic member 338 and a position sensor (not shown in the figure). The parking elastic member 338 in this embodiment is a Spring, one end of the parking push-pull rod 337 is connected to the push member 331, and the other end is connected to the parking member 334. The parking elastic member 338 is sleeved on the parking push-pull rod 337. When the position sensor detects that 331 reaches the set position, the pilot pressure regulating valve 1 controls the oil pressure entering the first oil chamber, so that the oil inlet spool valve 31 is switched to the basic position. Location.

In this embodiment, when the stopper 332 and the pusher 331 are separated, the elastic force of the reset elastic member 335 is the first pressure, and the difference between the inlet and outlet pressures of the first check valve 34 when the first check valve 34 is opened is the second pressure pressure, the second pressure is greater than the first pressure. The first pressure is lower than the second pressure, which can ensure that when the stopper 332 is separated from the pusher 331, the first check valve 34 is still in a closed state, thereby further increasing the outlet pressure of the oil of the pressure regulating valve and the first check When the difference between the inlet and outlet pressures of the valve 34 is not less than the second pressure, the second check valve 44 is opened.

As shown in FIG. 1 , the parking lock assembly 33 of this embodiment further includes a bushing 339 , the bushing 339 is located in the second chamber 33304 , the pusher 331 is sealed and slidably connected with the bushing 339 , and the pusher 331 pushes the second The chamber 33304 is divided into an isolated exhaust chamber and an oil chamber. The casing 333 is also provided with a third communication port 33305. The third communication port 33305 communicates with the exhaust chamber, and the second communication port 33302 communicates with the oil chamber. The third communication port 33305 and the exhaust chamber can make the gas pressure in the exhaust chamber the same as the outside gas pressure when the pusher 331 moves.

In this embodiment, when the limiting protrusion 3321 is located in the groove 3310, the elastic force of the elastic member 336 is the third pressure, and the third pressure is greater than the first pressure. When the parking gear is just started, the pressure of the oil discharged from the first working oil port into the first chamber 33303 is equal to the first pressure, and the first pressure is lower than the third pressure, which can make the stopper 332 and the pusher 331 detached , the loading elastic member 336 tends to push the pushing member 331 to the right.

In this embodiment, when the inlet and outlet of the pressure maintaining valve 35 are connected, the elastic force of the pressure maintaining elastic member of the pressure maintaining valve 35 is the fourth pressure, and the fourth pressure is lower than the third pressure. For example, after further pressurization, the oil at the outlet of the shuttle valve 36 enters the second chamber 33304 through the pressure maintaining valve 35 and the oil drain spool valve 32 in turn, and the oil pressure at the second outlet of the oil drain spool valve 32 is equal to the third pressure, The third pressure is greater than the first pressure, and because the fourth pressure is less than the third pressure, the resistance of the oil in the second chamber 33304 to the pushing member 331 is smaller than the maximum elastic force of the pressure-holding elastic member, so that the loading elastic member 336 can push The pusher 331 moves rightward in the horizontal direction.

The second oil inlet cavity of the oil inlet spool valve 31 in this embodiment is communicated with the outlet of the shuttle valve 36, and one end of the oil inlet elastic member of the oil inlet spool valve 31 extends into the second oil inlet cavity. This arrangement makes the oil inlet spool valve 31 actually work, the oil in the second oil inlet chamber and the oil inlet elastic member of the oil inlet spool valve 31 exert a leftward force on the oil inlet piston of the oil inlet spool valve 31, and the first The oil in the oil inlet chamber exerts a rightward force on the oil inlet piston, so that the oil inlet piston moves to the left or right, thereby changing the opening state of the oil inlet spool valve 31 and avoiding the misoperation of the pilot pressure regulating valve 1 The phenomenon of the oil inlet spool valve 31 occurs.

As shown in FIG. 1 , the parking lock structure of this embodiment further includes a first fuel tank 37 and a second fuel tank 38 . The first fuel tank 37 is communicated with the first fuel return port, so that the first fuel tank 37 can hold the first fuel tank 37 . For the oil discharged from the oil return port, the second oil tank 38 is communicated with the second oil return port, so that the second oil tank 38 can contain the oil discharged through the second oil return port.

The hydraulic control system of the automatic transmission of this embodiment further includes a low-pressure cooling and lubrication structure. As shown in FIG. 2 , the low-pressure cooling and lubrication structure includes a first oil tank 41 , a high-pressure oil pump 42 , a high-pressure filter 43 , and a second check valve that are connected in sequence. 44 and the accumulator 45, the accumulator 45 is respectively communicated with the first pressure regulating chamber of the first pressure regulating valve 211 and the second pressure regulating chamber of the second pressure regulating valve 221, and then the oil in the first pressure regulating chamber The opening state of the first pressure regulating valve 211 can be adjusted, the oil in the second pressure regulating chamber can adjust the opening state of the second pressure regulating valve 221, and the low-pressure cooling and lubricating structure also includes a switching valve 46, the inlet of the switching valve 46 and the high pressure The pipeline between the filter 43 and the second check valve 44 is connected, the second check valve 44 can be opened when the switching valve 46 is de-energized, and the high-pressure oil pump 42 can charge the accumulator 45; when the switching valve 46 is energized, The high-pressure oil pump 42 can pump the oil in the first oil tank 41 through the switching valve 46 , the high-pressure oil pump 42 releases pressure, the second check valve 44 is closed, and the accumulator 45 maintains pressure.

As shown in FIG. 2 , the low-pressure cooling and lubricating structure of this embodiment further includes a safety valve 47 and a pressure sensor 48 . The safety valve 47 is arranged between the high-pressure oil pump 42 and the high-pressure filter 43 , and the pressure sensor 48 is arranged to detect the accumulator 45 . pressure.

As shown in FIG. 2 , the low-pressure cooling and lubricating structure of this embodiment further includes a second oil tank 51 , a low-pressure oil pump 52 , a cooler 53 , and a low-pressure filter 54 that are communicated in sequence. The height of the second oil tank 51 is lower than that of the first oil tank 41 . height and the second oil tank 51 is communicated with the first oil tank 41. When refueling is required, by adding oil to the first oil tank 41, when the oil in the first oil tank 41 is full, the oil gradually flows to the second oil tank 51 to realize the For refueling of the second oil tank 51, the outlet of the low pressure filter 54 is communicated with the cooling pipeline 55 and the lubricating pipeline 56, respectively. One of the cooling pipeline 55 and the lubricating pipeline 56 is provided with a flow regulating valve 57. Connected with the pilot pressure regulating valve 1, the main function of the pilot pressure regulating valve 1 is to regulate the flow of the flow regulating valve 57, and the flow regulating valve 57 is a two-position two-way spool valve.

The opening pressure of the flow regulating valve 57 in this embodiment is greater than the force of the oil inlet elastic member on the oil inlet piston when the first oil inlet of the oil inlet slide valve 31 is connected to the first working oil port. When the flow regulating valve 57 is adjusted in the middle, the oil inlet spool valve 31 will not be affected.

As shown in FIG. 2 , the low-pressure cooling and lubricating structure of this embodiment further includes a suction filter 58 , a pressure relief valve 59 , and a bypass valve 510 . The suction filter 58 is located between the second oil tank 51 and the low-pressure oil pump 52 , and the suction filter 58 can utilize The vacuum makes the oil pass through the filter cloth of the suction filter 58 to separate the solid particles in the oil. The inlet of the pressure relief valve 59 is connected to the pipeline between the low pressure oil pump 52 and the cooler 53, and the outlet of the pressure relief valve 59 is connected to the second The pipeline between the oil tank 51 and the suction filter 58 is connected, and the pressure relief valve 59 can be opened when the oil pressure at the outlet of the low pressure oil pump 52 is high to return the oil at the outlet of the low pressure oil pump 52 to the second through the pressure relief valve 59. Oil tank 51, bypass valve 510 is connected in parallel with the series pipeline of cooler 53 and low pressure filter 54, bypass valve 510 can be opened when the temperature of oil in cooling pipeline 55 and lubricating pipeline 56 is low to prevent low pressure The oil at the outlet of the oil pump 52 continues to cool down.

As shown in FIG. 2 , the gear operation structure of this embodiment further includes an odd-numbered clutch pressure regulating valve 212 , an odd-numbered emergency oil drain spool valve 213 , a first odd-numbered shift valve 214 , a second odd-numbered shift valve 215 , and an even-numbered clutch pressure The regulating valve 222, the even-numbered emergency oil drain slide valve 223, the first even-numbered shift valve 224, and the second even-numbered shift valve 225, wherein the second odd-numbered shift valve 215 is connected with the first pressure regulating valve 211, and the first pressure regulating valve The valve 211 can adjust the oil flow of the first odd-numbered shift valve 214 and the second odd-numbered shift valve 215 to realize the shifting of the first, third, fifth, and seventh gears. The second even-numbered shift valve 225 is related to the second pressure. The regulating valve 221 is connected, and the second pressure regulating valve 221 can adjust the oil flow of the first even-numbered shift valve 224 and the second even-numbered shift valve 225 to realize the shifting of the second, fourth, sixth and reverse gears.

Claims

A hydraulic control system for an automatic transmission, comprising:

Pilot pressure regulating valve (1);

Gear operating structure, including pressure regulating valve;

A parking lock structure, comprising an oil inlet slide valve (31), an oil discharge slide valve (32) and a parking lock assembly (33), the parking lock assembly (33) includes a pusher (331), a stopper (332), a housing (333) with a cavity, and a parking member (334), the parking member (334) is connected with the pushing member (331), and the housing (333) is provided with A first communication port (33301) and a second communication port (33302) communicate with the chamber, and part of the pusher (331) extends into the chamber and divides the chamber into first chambers ( 33303) and the second chamber (33304), the stopper (332) is arranged in the first chamber (33303), the first oil inlet chamber of the oil inlet spool valve (31) is connected to the pilot The pressure regulating valve (1) is in communication, the first oil inlet of the oil inlet spool valve (31) can be communicated with the pressure regulating valve, and the oil inlet spool valve (31) is provided with a first working oil port and a first oil inlet. The oil return port, the oil in the first oil inlet cavity can push the oil inlet piston of the oil inlet slide valve (31) to make the first working oil port and the first oil return port or the first oil return port or the first oil return port. An oil inlet is communicated with, and the first working oil port can communicate with the first communication port (33301) and the first oil discharge cavity of the oil discharge spool valve (32). The second oil inlet can communicate with the pipeline between the pressure regulating valve and the first oil inlet, and the second communication port (33302) is connected to the second working oil of the oil drain spool valve (32). The oil in the first oil discharge chamber can push the oil discharge piston of the oil discharge slide valve (32) to make the second working oil port and the second return of the oil discharge slide valve (32) The oil port or the second oil inlet is connected, and the oil in the first chamber (33303) can push the stopper (332) to move in the first direction to make the stopper (332) In contact with or disengaged from the pusher (331), the oil in the second chamber (33304) can push the pusher (331) to move in the second direction to make the parking member (334) The second direction and the first direction are arranged at an included angle in contact with or disengagement from the parking pawl.
The hydraulic control system of an automatic transmission according to claim 1, wherein the parking lock structure further comprises a first check valve (34) and a pressure maintaining valve (35), the first check valve (34) ) is communicated with the first working oil port, and the outlet of the first check valve (34) is communicated with the first oil discharge chamber and the first pressure maintaining chamber of the pressure maintaining valve (35), The inlet of the pressure maintaining valve (35) is communicated with the outlet of the pressure regulating valve, the outlet of the pressure maintaining valve (35) is communicated with the second oil inlet, and the first check valve (34) ) is turned on, the oil discharged from the first working oil port enters the first oil discharge chamber and the first pressure holding chamber through the first check valve (34), and the pressure regulating valve The oil discharged from the outlet enters the second chamber (33304) through the pressure maintaining valve (35), the second oil inlet, the second working oil port, and the second communication port (33302). ).
The hydraulic control system for an automatic transmission according to claim 2, wherein the number of the pressure regulating valves is two, and the two pressure regulating valves are a first pressure regulating valve (211) and a second pressure regulating valve (211), respectively. 221), the parking lock structure further comprises a shuttle valve (36), the two inlets of the shuttle valve (36) are respectively connected with the first pressure regulating valve (211) and the second pressure regulating valve ( 221), the outlet of the shuttle valve (36) is communicated with the first oil inlet and the inlet of the pressure maintaining valve (35) respectively.
The hydraulic control system of the automatic transmission according to claim 3, wherein when the vehicle is switched between the first gear and the parking gear, the first pressure regulating valve (211) and the second pressure regulating valve ( 221) is communicated with the shuttle valve (36) and the oil inlet spool valve (31).
The hydraulic control system for an automatic transmission according to claim 3, wherein one of the stopper (332) and the pusher (331) is provided with a limiting protrusion (3321), and the other is provided with a limiting protrusion (3321) The groove (3310) matched with the limiting protrusion (3321), the parking lock assembly (33) includes:

A reset elastic member (335), the reset elastic member (335) is located in the first chamber (33303), one end of the reset elastic member (335) is connected to the housing (333), and the other end is connected to the housing (333). The stopper (332) is connected, and the reset elastic piece (335) is compressed when the stopper (332) is separated from the pusher (331), and the reset elastic piece (335) Set to reset the stopper (332), so that the limit protrusion (3321) is located in the groove (3310) or the stopper (332) and the pusher (331) end face contact;

A loading elastic member (336), the loading elastic member (336) is sleeved on the pushing member (331) and located on the outer side of the housing (333), and one end of the loading elastic member (336) is connected to the The housing (333) is connected, and the other end is connected with the pusher (331) or the pusher (331). When the parking member (334) is separated from the parking pawl, the The loading elastic member (336) is compressed, and the loading elastic member (336) is configured to push the pushing member (331) to move in the second direction, so that the pushing member (331) drives the parking A piece (334) abuts the parking pawl.
The hydraulic control system of the automatic transmission according to claim 5, wherein when the stopper (332) is separated from the pusher (331), the elastic force of the return elastic member (335) is the first a pressure, when the first check valve (34) is opened, the difference between the inlet and outlet pressures of the first check valve (34) is a second pressure, and the second pressure is greater than the first pressure pressure; when the limiting protrusion (3321) is located in the groove (3310), the elastic force of the loading elastic member (336) is a third pressure, and the third pressure is greater than the first pressure pressure, when the inlet and outlet of the pressure maintaining valve (35) are connected, the elastic force of the pressure maintaining elastic member of the pressure maintaining valve (35) is a fourth pressure, and the fourth pressure is lower than the third pressure .
The hydraulic control system of an automatic transmission according to claim 5, wherein the parking lock assembly (33) further comprises a bushing (339) located in the second chamber (33304) ), the pusher (331) is in sealing and sliding connection with the bushing (339), and the pusher (331) divides the second chamber (33304) into isolated exhaust chambers and oil The casing (333) is further provided with a third communication port (33305), the third communication port (33305) communicates with the exhaust chamber, and the second communication port (33302) communicates with the exhaust chamber. The oil chamber is communicated.
The hydraulic control system of the automatic transmission according to claim 1, wherein the parking lock structure further comprises a first oil tank (37) and a second oil tank (38), the first oil tank (37) and the The first oil return port is in communication, and the second oil tank (38) is in communication with the second oil return port.
The hydraulic control system for an automatic transmission according to claim 1, further comprising a low-pressure cooling and lubricating structure, the low-pressure cooling and lubricating structure comprising a first oil tank (41), a high-pressure oil pump (42), and a high-pressure filter (43) that are communicated in sequence , the second check valve (44), the accumulator (45) and the switching valve (46), the inlet of the switching valve (46) is connected to the high pressure filter (43) and the second check valve ( 44), the second check valve (44) is opened when the switching valve (46) is de-energized, and the high-pressure oil pump (42) is set as the accumulator (44). 45) Pressurizing; when the switching valve (46) is energized, the high-pressure oil pump (42) is configured to pump the oil in the first oil tank (41) through the switching valve (46) , the high-pressure oil pump (42) releases pressure, the second check valve (44) is in a closed state, and the accumulator (45) maintains pressure.
The hydraulic control system of an automatic transmission according to claim 9, wherein the low-pressure cooling and lubricating structure further comprises a second oil tank (51), a low-pressure oil pump (52), a cooler (53), a low-pressure filter ( 54), the outlet of the low pressure filter (54) is communicated with a cooling line (55) and a lubricating line (56), and one of the cooling line (55) and the lubricating line (56) is connected A flow regulating valve (57) is provided, and the flow regulating valve (57) is connected with the pilot pressure regulating valve (1).