CN113124150A

CN113124150A - Gearbox hydraulic system

Info

Publication number: CN113124150A
Application number: CN202110425186.5A
Authority: CN
Inventors: 朱顺利; 卞国胜; 李卫强; 解建; 于晓春; 韩启锋
Original assignee: Kuntye Vehicle System Changzhou Co Ltd
Current assignee: Kuntye Vehicle System Changzhou Co Ltd
Priority date: 2021-04-20
Filing date: 2021-04-20
Publication date: 2021-07-16

Abstract

The invention discloses a gearbox hydraulic system which comprises an oil supply subsystem, a main oil pressure control subsystem, a clutch control subsystem, a gear shifting control subsystem and a lubricating and cooling subsystem, wherein the oil supply subsystem is communicated with the lubricating and cooling subsystem through a lubricating oil way, an oil cooler communicated with the lubricating oil way is arranged in the lubricating and cooling subsystem, the output end of the lubricating and cooling subsystem is provided with three branches which are respectively communicated with a first flow control valve, a second flow control valve and a group of throttling holes, the first flow control valve is communicated with a first motor, the second flow control valve is communicated with a second motor, and the group of throttling holes are respectively communicated with a bearing, a clutch, a gear and a synchronizer. According to the invention, the lubricating oil is cooled by the oil cooler and then divided into three paths, so that the lubricating and cooling subsystem can accurately supply the cooling lubricating oil according to the cooling requirements of different parts of the gearbox under different working conditions, thereby improving the cooling efficiency and reducing the unnecessary oil consumption.

Description

Gearbox hydraulic system

Technical Field

The invention relates to the technical field of automobile gearboxes, in particular to a gearbox hydraulic system.

Background

The hybrid system is a hybrid system. The transmission system which can couple the power of the engine and the driving motor together in a certain mode and can realize speed change and torque change is a hybrid gearbox. Hybrid transmissions can generally be divided into dedicated hybrid transmissions and improved hybrid transmissions based on a conventional transmission integrated hybrid unit (drive motor and corresponding control system).

In the hybrid system, the working mode of the driving motor is very flexible: the vehicle can be driven independently, and pure electric driving is realized; the device can be used as a starting device of the engine to assist the engine to start; the power assisting device can provide power for the engine and improve the acceleration capability of the vehicle; the fuel economy of the engine can be improved by adjusting the torque load of the engine when the vehicle is driven together with the engine; the device can also be used as an energy feedback device to recover braking energy in vehicle deceleration and the like.

However, with the increasing of the oil consumption and emission of automobiles, the national regulations and regulations of the automobile are increased day by day, the hybrid power special gearbox faces higher energy consumption requirements, the oil supply system in the prior art is not reasonable in design, the oil pump of the cooling and lubricating oil way and the oil pump of the main oil way of the gearbox can generate an oil robbing phenomenon during working, and the filtering load of an oil outlet filter screen is increased; the unreasonable arrangement of the structural design of the hydraulic system among the system functions causes the oil pump to work excessively, unnecessary energy consumption is generated, and excessive emission finally influences the use effect of the gearbox, and influences the use performance and service life of each component in the gearbox.

Therefore, a hydraulic system which is reasonable in structural design and suitable for a hybrid power transmission is a problem which needs to be solved urgently at present.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a hydraulic system of a gearbox.

The purpose of the invention is realized by the following technical scheme:

the utility model provides a gearbox hydraulic system, includes fuel feeding subsystem, main oil pressure control subsystem, clutch control subsystem, gear shift control subsystem and lubricated cooling subsystem, the fuel feeding subsystem communicates with lubricated cooling subsystem through lubricated oil circuit, be provided with the oil cooler with lubricated oil circuit intercommunication in the lubricated cooling subsystem, lubricated cooling subsystem's output has three branch road, communicates first flow control valve, second flow control valve and a set of orifice respectively, first flow control valve communicates first motor, second flow control valve communicates the second motor, and is a set of the orifice communicates bearing, clutch, gear, synchronous ware respectively.

Preferably, the output ends of the first flow control valve and the second flow control valve are also provided with orifices.

Preferably, the input end of the oil cooler is provided with a temperature sensor.

Preferably, one side of the oil cooler is connected in parallel with a first bypass valve, and the hydraulic oil is output from the output end of the oil cooler or the first bypass valve.

Preferably, a first electronic pump and a second electronic pump which are connected are arranged in the oil supply subsystem, the first electronic pump is communicated with the lubricating and cooling subsystem through a lubricating oil path, a switch control valve is arranged on a connecting oil path between the second electronic pump and the lubricating oil path, the communication between the second electronic pump and the lubricating oil path is controlled through the switch control valve, the second electronic pump is communicated with the main oil pressure control subsystem through a main oil path, and the main oil path is connected with the switch control valve in parallel.

Preferably, the second electronic pump is communicated with a first energy accumulator in the main oil pressure control subsystem through a main oil path, a high-pressure filter and a first check valve are further sequentially arranged between the second electronic pump and the first energy accumulator, the first check valve controls hydraulic oil to flow into the first energy accumulator from the second electronic pump in a one-way mode, and the high-pressure filter is connected with a second bypass valve in parallel.

Preferably, a safety valve communicated with the main oil way is arranged in the main oil pressure control subsystem and is used for limiting the highest oil pressure of the main oil pressure control subsystem, the clutch control subsystem and the gear shifting control subsystem.

Preferably, a pressure sensor is arranged in the main oil pressure control subsystem, and the pressure sensor is arranged close to the clutch control subsystem.

Preferably, the clutch control subsystem includes in proper order with clutch control valve and the clutch of main oil circuit intercommunication, all be equipped with the filter screen before the input of clutch control valve and clutch, the filter screen with the parallel connection has the second energy storage ware between the clutch, the spring end of clutch control valve is provided with a feedback oil circuit, and its with the draining end of oil tank intercommunication is provided with the second check valve.

Preferably, the gear shifting control subsystem comprises two groups of solenoid valve units communicated with the main oil way, each group of solenoid valve unit is provided with a solenoid valve and two filter screens, a spring end of the solenoid valve is provided with a feedback oil way, the two filter screens are respectively arranged at an input end and an output end of the solenoid valve, a gear shifting piston is connected between the two solenoid valve units, and a gear shifting fork in the gear shifting piston is subjected to differential control.

The invention has the following beneficial effects:

1. after being cooled by the oil cooler, the lubricating oil is divided into three paths, and the three paths of lubricating oil respectively enter the first motor, the second motor, the bearing, the clutch, the gear and the synchronizer through the first flow control valve, the second flow control valve and the group of throttling holes; the lubricating and cooling subsystem can accurately supply cooling lubricating oil according to the cooling requirements of different parts of the gearbox according to different working conditions, so that the cooling requirements of the gearbox are met, and the cooling efficiency is improved; unnecessary oil consumption is reduced, and energy consumption of an oil supply subsystem is saved;

2. one side of the oil cooler is connected with a first bypass valve in parallel, so that the problem that the circulation of lubricating oil is not smooth when the oil cooler is blocked or the pressure drop is overlarge can be prevented, and the hydraulic oil in the lubricating and cooling subsystem can be smoothly input into each lubricating point;

3. the input end of the lubrication cooling subsystem is provided with a temperature sensor, so that the temperature sensor can monitor the oil temperature of the whole system in real time;

4. the switch control valve and the main oil way are arranged in parallel, and the characteristic that the oil pressure between the main oil way and the lubricating oil way is inconsistent is utilized, so that the switching of the main oil way and the lubricating oil way can be realized only by opening and closing the switch control valve, the second electronic pump does not need to keep high-pressure work, the working mode can be switched, the first energy accumulator is matched, the intermittent high-pressure work is realized, the energy consumption is reduced, and the service life is prolonged.

Drawings

The technical scheme of the invention is further explained by combining the accompanying drawings as follows:

FIG. 1: the invention discloses a hydraulic schematic diagram of a gearbox hydraulic control system.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art in light of these embodiments are intended to be within the scope of the present invention.

In the description of the schemes, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the embodiment, the operator is used as a reference, and the direction close to the operator is a proximal end, and the direction away from the operator is a distal end.

As shown in fig. 1, the invention discloses a gearbox hydraulic system, which comprises an oil supply subsystem 1, a main oil pressure control subsystem 2, a clutch control subsystem 3, a gear shift control subsystem 4 and a lubrication cooling subsystem 5, wherein the oil supply subsystem 1 is communicated with the lubrication cooling subsystem 5 through a lubrication oil path 6, an oil cooler 502 communicated with the lubrication oil path 6 is arranged in the lubrication cooling subsystem 5, the output end of the lubrication cooling subsystem 5 is provided with three branches respectively communicated with a first flow control valve 505, a second flow control valve 506 and a group of orifices 504, the first flow control valve 505 is communicated with a first motor (not shown in the figure), the second flow control valve 506 is communicated with a second motor (not shown in the figure), and the group of orifices 504 are respectively communicated with a bearing, a clutch, a gear and a synchronizer. Due to the structural arrangement, the lubricating and cooling subsystem 5 can accurately supply cooling lubricating oil according to the cooling requirements of different parts of the gearbox under different working conditions, so that the cooling requirements of the gearbox are met, and the cooling efficiency is improved; and unnecessary oil consumption is reduced, and the energy consumption of the oil supply subsystem 1 is saved.

To further control the oil amount, the output ends of the first flow control valve 505 and the second flow control valve 506 are also provided with orifices 504. The orifice 504 can control back pressure and lubrication flow, and the specific diameter of the orifice 504 is specifically determined after simulation analysis so as to be more suitable for practical use. In the preferred embodiment, each lubrication point has an orifice 504 to control flow, further reducing cost.

In order to detect the oil temperature of the whole system, the input end of the oil cooler 502 is provided with a temperature sensor 501. Because the hydraulic oil is continuously supplied in the working process of the gearbox, the oil temperature of the whole gearbox can be monitored in real time by the arrangement, real-time data are provided for the temperature compensation coefficients of the electromagnetic valve 401 and the clutch control valve 301 in the whole gearbox, and the control of the whole gearbox is ensured.

In order to ensure the smoothness of the lubrication cooling subsystem 5, a first bypass valve 503 is connected in parallel to one side of the oil cooler 502, and hydraulic oil is output from the output end of the oil cooler 502 or the first bypass valve 503. The first bypass valve 503 can prevent the oil cooler from being blocked or from having too large pressure drop, which causes unsmooth circulation of the lubricating oil, and ensures that the hydraulic oil in the lubrication cooling subsystem can be smoothly input into each lubrication point.

The oil supply subsystem 1 is internally provided with a first electronic pump 101 and a second electronic pump 102 which are connected with each other, the first electronic pump 101 is communicated with the lubrication cooling subsystem 5 through a lubrication oil path 6, a switch control valve 201 is arranged on a connection oil path between the second electronic pump 102 and the lubrication oil path 6, the communication between the second electronic pump 102 and the lubrication oil path 6 is controlled through the switch control valve 201, the second electronic pump 102 is communicated with the main oil pressure control subsystem 2 through a main oil path 7, and the main oil path 7 is connected with the switch control valve 201 in parallel. Due to the fact that the oil pressure of the main oil path 7 is larger than that of the lubricating oil path 6, when the two-position two-way switch valve 201 is closed, the second electronic pump 102 is communicated with the main oil path 7; when the two-position two-way switch valve 201 is opened, the second electronic pump 102 is communicated with the lubricating oil path 6 and naturally disconnected from the main oil path 7. The switch control valve 201 and the main oil way 7 are arranged in parallel, and the characteristic that the oil pressure between the main oil way 7 and the lubricating oil way 6 is inconsistent is utilized, so that the switching between the main oil way 7 and the lubricating oil way 6 can be realized only by opening and closing the switch control valve 201, the second electronic pump 102 does not need to keep high-pressure work, the working mode can be switched, and the first energy accumulator is matched to intermittently work at high pressure, so that the energy consumption is reduced, and the service life is prolonged.

In the present invention, a filter 103 is disposed between the first electronic pump 101 and the second electronic pump 102 and the oil tank 100 to filter the hydraulic oil from the oil tank 100, so as to ensure the cleanness of the oil.

Further, the second electronic pump 102 is communicated with the first accumulator 202 in the main oil pressure control subsystem 2 through a main oil path 7, the second electronic pump 102 is communicated with the main oil path 7 to supply oil to the first accumulator 202, and the clutch control subsystem 3 and the shift control subsystem 4 are supplied with oil from the first accumulator 202. In order to meet the required pressure of the system, the first accumulator 202 has an air bag inside, and the air bag has a pre-charging pressure, and in a preferred embodiment, the gas filled in the air bag is nitrogen. The arrangement of the first accumulator 202 ensures that the clutch control subsystem 3 and the shift control subsystem 4 can still obtain hydraulic oil through the main oil path 7 under the condition that the second electronic pump 102 is not communicated with the main oil path 7.

The opening and closing of the on-off control valve 201 is affected by the pressure in the main oil pressure control subsystem 2, when the pressure in the main oil pressure control subsystem 2 is lower than a set value, the on-off control valve 201 is closed, and the second electronic pump 102 communicates the main oil passage 7 to supply oil to the first accumulator 202; when the pressure in the main oil pressure control subsystem 2 reaches a set value, the switch control valve 201 is opened, the second electronic pump 102 is communicated with the lubricating oil path 6 to supply oil to the lubricating and cooling subsystem 5, and therefore the gap high-pressure work of the second electronic pump 102 is achieved.

In order to monitor the system pressure in the main oil pressure control subsystem 2 in real time, a pressure sensor 205 is provided in the main oil pressure control subsystem 2, which is in communication with the main oil passage 7, and in a preferred embodiment, the pressure sensor 205 is provided close to the clutch control subsystem 3. The pressure value measured by the pressure sensor 205 is closer to the actual value of the clutch pressure, and more accurate data support is provided for the control of the TCU.

Further, a high-pressure filter 206 and a first check valve 204 are sequentially disposed on the main oil path 7 between the second electronic pump 102 and the first accumulator 202, and the first check valve 204 controls the hydraulic oil to flow from the second electronic pump 102 to the first accumulator 202 in a single direction. The high-pressure filter 206 can filter impurities in the hydraulic oil, and ensure the cleanness of oil products of the hydraulic oil. The arrangement of the first check valve 204 can prevent the hydraulic oil from backing from the main oil path 7, so that the hydraulic oil passing through the first check valve 204 is completely input into the clutch control subsystem 3 and the gear shifting control subsystem 4, and the energy consumption waste is reduced.

In order to prevent the high-pressure filter 206 from blocking the entire main oil path 7 after being blocked, a second bypass valve 207 connected in parallel with the high-pressure filter 206 is further disposed on the main oil path 7 between the second electronic pump 102 and the first accumulator 202 to ensure continuous and smooth flow of the main oil path 7.

And a safety valve 203 communicated with the main oil way 7 is arranged in the main oil pressure control subsystem 2 and is used for limiting the highest oil pressure of the main oil pressure control subsystem 2, the clutch control subsystem 3 and the gear shifting control subsystem 4.

The clutch control subsystem 3 comprises a clutch control valve 301 and a clutch 302 which are sequentially communicated with the main oil path 7, wherein the clutch control valve 301 is a VFS solenoid valve controlled clutch, so that the clutch control valve 301 can accurately control the pressure and the flow of the passing hydraulic oil. Specifically, the size of the area of the matching opening of the valve core and the valve body of the clutch control valve 301 and the amount of hydraulic oil in the piston cavity of the clutch 302 are controlled by controlling the current of the clutch control valve 301, so that the pressure of the hydraulic oil in the piston cavity of the clutch 302 is adjusted, and the torque transmitted by the clutch 302 is adjusted.

In order to improve the cleanliness of the hydraulic oil entering and exiting the cavity of the clutch 302 and avoid the blockage of the slide valve caused by impurities, filter screens 8 are arranged in front of the input ends of the clutch control valve 301 and the clutch 302. And a second one-way valve 303 is arranged at the oil drainage end of the clutch control valve 301 communicated with the oil tank 100 to avoid the backflow of hydraulic oil.

Further, a spring end of the clutch control valve 301 is provided with a feedback oil path 10. The feedback oil path 10 makes the spring force, the feedback pressure and the electromagnetic force form dynamic balance, and the control of the pressure of the clutch 302 can realize smooth curve linear control, thereby improving the accuracy of controlling the combination and the separation of the clutch 302.

The output end of the clutch control valve 301 is provided with a second energy accumulator 305 connected with the clutch 302 in parallel, and the filter screen 8 is arranged between the second energy accumulator 305 and the clutch control valve 301. The second accumulator 3 can absorb oil vibration and hydraulic impact caused by fluctuation of the main oil passage 7, so that the two states of connection and disconnection of the clutch 302 are more stable.

The gear shift control subsystem 4 comprises two identical sets of solenoid valve units, each set of solenoid valve units having a solenoid valve 401 and two screens 8, the two solenoid valves 401 being of the same type, and in the preferred embodiment, the solenoid valves 401 and the clutch control valve 301 being of the same type, so that they have good interchangeability. Two filter screen 8 set up respectively in solenoid valve 401's input and output, filter screen 8's setting can further improve the inflow or flow out the oil cleanness of solenoid valve 401's hydraulic oil prevents solenoid valve 401 is by the impurity jamming.

Further, a spring end of the electromagnetic valve 401 is provided with a feedback oil path 10, and the feedback oil path 10 can be arranged to improve the control accuracy of the electromagnetic valve 401 when the electromagnetic valve is controlled.

A shift piston 402 is connected between the two solenoid valve units, and performs differential control on a shift fork 403 in the shift piston 402. The specific gear shifting is as follows: when the gear 1 is shifted, the TCU controls the current of the electromagnetic valve 401 at the right end to act according to the working condition, pressure oil enters the right piston, and the shifting piston 402 and the shifting fork 403 are integrated, so that the shifting fork 403 can smoothly push the synchronizing ring in the synchronizer to shift gears under the action of pressure. When gear shifting is to be finished, in order to avoid gear shifting impact and reduce NVH of gear shifting, the TCU controls the electromagnetic valve 401 at the left end to act, a small pressure is given to the gear shifting piston 402 at the left end to form differential control, so that no impact is generated when gear shifting is finished, and gear shifting is smoothly finished. Meanwhile, a displacement sensor (not shown in the figure) is arranged on the shifting piston 402, and according to a displacement signal, whether the gear is finished and the time for the left electromagnetic valve 401 to enter differential control can be judged. After the displacement sensor judges that gear shifting is completed, the current of the electromagnetic valve 401 at the right end of the TCU is controlled to be zero.

As shown in fig. 1, the present invention further provides a parking subsystem 9, where the parking subsystem 9 is provided with a control valve 901 and a hydraulic parking mechanism 902, which are communicated with the main oil path 7, and the parking subsystem 9 is also supplied with oil by the first accumulator 202, which is not a key point of the present invention and is not described herein again.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a gearbox hydraulic system, includes fuel feeding subsystem (1), main oil pressure control subsystem (2), clutch control subsystem (3), gear shift control subsystem (4) and lubricated cooling subsystem (5), its characterized in that: the oil supply subsystem (1) is communicated with the lubrication cooling subsystem (5) through a lubrication oil way (6), an oil cooler (502) communicated with the lubrication oil way (6) is arranged in the lubrication cooling subsystem (5), the output end of the lubrication cooling subsystem (5) is provided with three branches which are respectively communicated with a first flow control valve (505), a second flow control valve (506) and a group of throttling holes (504), the first flow control valve (505) is communicated with a first motor, the second flow control valve (506) is communicated with a second motor, and the group of throttling holes (504) are respectively communicated with a bearing, a clutch, a gear and a synchronizer.

2. A transmission hydraulic system according to claim 1, characterized in that: the output ends of the first flow control valve (505) and the second flow control valve (506) are also provided with orifices (504).

3. A gearbox hydraulic system according to claim 2, characterised in that: and the input end of the oil cooler (502) is provided with a temperature sensor (501).

4. A gearbox hydraulic system according to claim 3, characterised in that: one side of the oil cooler (502) is connected with a first bypass valve (503) in parallel, and hydraulic oil is output from the output end of the oil cooler (502) or the first bypass valve (503).

5. A gearbox hydraulic system according to any one of claims 1-4, characterized in that: the oil supply system is characterized in that a first electronic pump (101) and a second electronic pump (102) which are connected are arranged in the oil supply subsystem (1), the first electronic pump (101) is communicated with the lubricating and cooling subsystem (5) through a lubricating oil path (6), a switch control valve (201) is arranged on a connecting oil path between the second electronic pump (102) and the lubricating oil path (6), the communication between the second electronic pump (102) and the lubricating oil path (6) is controlled through the switch control valve (201), the second electronic pump (102) is communicated with the main oil pressure control subsystem (2) through a main oil path (7), and the main oil path (7) is connected with the switch control valve (201) in parallel.

6. A gearbox hydraulic system according to claim 5, characterised in that: the second electronic pump (102) is communicated with a first energy accumulator (202) in the main oil pressure control subsystem (2) through a main oil way (7), a high-pressure filter (206) and a first one-way valve (204) are sequentially arranged between the second electronic pump (102) and the first energy accumulator (202), the first one-way valve (204) controls hydraulic oil to flow into the first energy accumulator (202) from the second electronic pump (102) in a one-way mode, and the high-pressure filter (206) is connected with a second bypass valve (207) in parallel.

7. A gearbox hydraulic system according to claim 6, characterised in that: and a safety valve (203) communicated with the main oil way (7) is arranged in the main oil pressure control subsystem (2) and is used for limiting the highest oil pressure of the main oil pressure control subsystem (2), the clutch control subsystem (3) and the gear shifting control subsystem (4).

8. A gearbox hydraulic system according to claim 7, characterised in that: a pressure sensor (205) is arranged in the main oil pressure control subsystem (2), and the pressure sensor (205) is close to the clutch control subsystem (3).

9. A transmission hydraulic system according to claim 1, characterized in that: clutch control subsystem (3) including in proper order with clutch control valve (301) and clutch (302) of main oil circuit (7) intercommunication, all be equipped with filter screen (8) before the input of clutch control valve (301) and clutch (302), filter screen (8) with second energy storage ware (305) have parallelly connected between clutch (302), the spring end of clutch control valve (301) is provided with a feedback oil circuit (10), and its with the draining end of oil tank (100) intercommunication is provided with second check valve (303).

10. A transmission hydraulic system according to claim 1, characterized in that: the gear shifting control subsystem (4) comprises two groups of solenoid valve units communicated with a main oil way (7), each group of solenoid valve unit is provided with a solenoid valve (401) and two filter screens (8), a spring end of the solenoid valve (401) is provided with a feedback oil way (10), the two filter screens (8) are respectively arranged at the input end and the output end of the solenoid valve (401), a gear shifting piston (402) is connected between the two solenoid valve units, and the gear shifting fork (403) in the gear shifting piston (402) is subjected to differential control.