CN112984005B - Wet clutch hydraulic control system and automatic gearbox - Google Patents
Wet clutch hydraulic control system and automatic gearbox Download PDFInfo
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- CN112984005B CN112984005B CN202110353567.7A CN202110353567A CN112984005B CN 112984005 B CN112984005 B CN 112984005B CN 202110353567 A CN202110353567 A CN 202110353567A CN 112984005 B CN112984005 B CN 112984005B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
- F16D2048/0203—Control by fluid pressure with an accumulator; Details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
- F16D2048/0221—Valves for clutch control systems; Details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
- F16D2048/0257—Hydraulic circuit layouts, i.e. details of hydraulic circuit elements or the arrangement thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
- F16D2048/0257—Hydraulic circuit layouts, i.e. details of hydraulic circuit elements or the arrangement thereof
- F16D2048/0263—Passive valves between pressure source and actuating cylinder, e.g. check valves or throttle valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
- F16D2048/0257—Hydraulic circuit layouts, i.e. details of hydraulic circuit elements or the arrangement thereof
- F16D2048/0287—Hydraulic circuits combining clutch actuation and other hydraulic systems
- F16D2048/029—Hydraulic circuits combining clutch actuation with clutch lubrication or cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
- F16D2048/0257—Hydraulic circuit layouts, i.e. details of hydraulic circuit elements or the arrangement thereof
- F16D2048/0287—Hydraulic circuits combining clutch actuation and other hydraulic systems
- F16D2048/0293—Hydraulic circuits combining clutch and transmission actuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/10—System to be controlled
- F16D2500/102—Actuator
- F16D2500/1026—Hydraulic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/10—System to be controlled
- F16D2500/102—Actuator
- F16D2500/1026—Hydraulic
- F16D2500/1027—Details about the hydraulic valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/50—Problem to be solved by the control system
- F16D2500/51—Relating safety
- F16D2500/5104—Preventing failures
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
The invention discloses a wet clutch hydraulic control system and an automatic gearbox, wherein the wet clutch hydraulic control system comprises a pressure control assembly and an oil drainage protection assembly, wherein an oil inlet pipeline is formed on the pressure control assembly, an inlet of the oil inlet pipeline is communicated with an oil tank, and an outlet of the oil inlet pipeline is communicated with a clutch; the oil drainage protection component is provided with an oil drainage pipeline, one end of the oil drainage pipeline is communicated with the clutch, the other end of the oil drainage pipeline is communicated with the oil tank, and the oil drainage pipeline is provided with a control component so as to open or close the oil drainage pipeline; the wet clutch hydraulic control system is provided with an oil supply state and an oil return state, the oil supply state is used for pumping oil into the clutch through the oil inlet pipeline, the oil drainage pipeline is closed through the control assembly, the oil return state is used for returning the oil into the oil tank through the oil inlet pipeline, and the oil drainage pipeline is opened through the control assembly.
Description
Technical Field
The invention relates to the technical field of clutches, in particular to a wet clutch hydraulic control system and an automatic gearbox.
Background
The wet clutch switching and control of the automatic gearbox are realized through a hydraulic system, the hydraulic control system receives a control signal of a TCU (transmission control unit), the clutch is controlled to be disengaged and engaged through adjusting oil pressure, meanwhile, cooling and lubrication are carried out on the clutch, the automatic control requirement of a vehicle is met, an existing clutch hydraulic control branch circuit carries out switching of an oil way flow direction through a pressure control valve, however, when the clutch pressure control valve breaks down, the clutch cannot be disengaged, and potential safety hazards exist.
Disclosure of Invention
The invention mainly aims to provide a wet clutch hydraulic control system and an automatic gearbox, and aims to solve the problem that when a clutch pressure control valve fails, a clutch cannot be disengaged and potential safety hazards exist in the conventional clutch single oil way.
In order to achieve the above object, the present invention provides a wet clutch hydraulic control system, including:
the pressure control assembly is provided with an oil inlet pipeline, an inlet of the oil inlet pipeline is communicated with the oil tank, and an outlet of the oil inlet pipeline is communicated with the clutch; and the number of the first and second groups,
the oil drainage protection component is provided with an oil drainage pipeline, one end of the oil drainage pipeline is communicated with the clutch, the other end of the oil drainage pipeline is communicated with the oil tank, and the oil drainage pipeline is provided with a control component so as to open or close the oil drainage pipeline;
the wet clutch hydraulic control system is provided with an oil supply state and an oil return state, the oil supply state is used for pumping oil into the clutch through the oil inlet pipeline, the oil drainage pipeline is closed through the control assembly, the oil return state is used for returning the oil into the oil tank through the oil inlet pipeline, and the oil drainage pipeline is opened through the control assembly.
Optionally, the control assembly includes a one-way valve on the drain line.
Optionally, the check valve comprises a valve tube with two open ends and a valve core movably mounted in the valve tube;
the control assembly further comprises an oil discharge control valve located on the oil drainage pipeline, the oil discharge control valve is provided with a cavity, a first oil port and two second oil ports are formed in the side wall of the cavity in a vertically staggered mode, the first oil port is selectively communicated with one of the second oil ports, so that oil in the clutch is led out to an oil tank through the oil inlet pipeline in the oil return state or oil in the oil tank is led into the oil drainage pipeline to push the valve core to be in sealing fit with one of the openings in the oil drainage pipeline in the oil supply state.
Optionally, the oil release control valve comprises:
the oil pump comprises a valve body, wherein a first cavity and a second cavity are formed in the valve body at intervals, a communication channel is formed between the first cavity and the second cavity, the first cavity is used for forming the cavity, and the second cavity is communicated with an oil tank;
the piston rod is movably installed along the length direction of the communicating channel, one end of the piston rod is positioned in the second cavity, and the other end of the piston rod extends into the second cavity through the communicating channel; and the number of the first and second groups,
the two blocking blocks are arranged at the side end, extending into the second cavity, of the piston rod and are arranged at intervals along the length direction of the piston rod, and the two blocking blocks are arranged corresponding to the two second oil ports;
the piston rod moves to drive the two blocking blocks to be respectively in sealing fit with the corresponding second oil ports, so that the other second oil port is communicated with the first oil port.
Optionally, the pressure control subassembly is including being located advance the last pressure control valve of oil pipe way, be formed with the oil pocket in the pressure control valve, be equipped with crisscross first export and two second exports that set up from top to bottom on the lateral wall of oil pocket, first export alternative with one of them the second export is linked together, in order to be in respectively will be returned by the clutch during the oil return state advance oil pipe way to the oil tank, perhaps will the oil warp in the oil tank during the fuel feeding state advance oil pipe way and enter into the clutch.
Optionally, the oil inlet pipeline comprises a first oil inlet pipeline and a second oil inlet pipeline which are sequentially connected, the first oil inlet pipeline is communicated with the clutch, the second oil inlet pipeline is communicated with the oil tank, and the second oil inlet pipeline and the oil drainage pipeline are arranged in parallel;
the pressure control assembly further comprises a pressure control valve located on the second oil inlet line.
Optionally, the wet clutch hydraulic control system further includes an accumulator located on the oil inlet pipeline, and the accumulator is used for storing compression energy to be converted into hydraulic energy required by the oil inlet pipeline.
Optionally, the wet clutch hydraulic control system further includes a pressure sensor located on the oil inlet pipeline, and configured to detect a pressure in the oil inlet pipeline.
Optionally, the pressure control assembly comprises a pressure control valve located on the oil feed line;
the wet clutch hydraulic control system further comprises a terminal controller electrically connected with the pressure control valve.
The invention further provides an automatic transmission, which comprises the wet clutch hydraulic control system, wherein the wet clutch hydraulic control system comprises:
the pressure control assembly is provided with an oil inlet pipeline, an inlet of the oil inlet pipeline is communicated with the oil tank, and an outlet of the oil inlet pipeline is communicated with the clutch; and the number of the first and second groups,
the oil drainage protection component is provided with an oil drainage pipeline, one end of the oil drainage pipeline is communicated with the clutch, the other end of the oil drainage pipeline is communicated with the oil tank, and the oil drainage pipeline is provided with a control component so as to open or close the oil drainage pipeline;
the wet clutch hydraulic control system is provided with an oil supply state and an oil return state, the oil supply state is used for pumping oil into the clutch through the oil inlet pipeline, the oil drainage pipeline is closed through the control assembly, the oil return state is used for returning the oil into the oil tank through the oil inlet pipeline, and the oil drainage pipeline is opened through the control assembly.
In the technical scheme of the invention, in the process of clutch engagement, the wet clutch hydraulic control system is in an oil supply state, the oil drain pipeline is closed, oil enters the clutch through the oil inlet pipeline, in the process of clutch disengagement, the wet clutch hydraulic control system is in an oil return state, the oil drain pipeline is opened, and the oil can respectively return to the oil tank through the oil inlet pipeline and the oil drain pipeline in the process of returning the oil to the oil tank from the clutch.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of an embodiment of a wet clutch hydraulic control system according to the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indication is involved in the embodiment of the present invention, the directional indication is only used for explaining the relative positional relationship, the motion situation, and the like between the components in a certain posture, and if the certain posture is changed, the directional indication is changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The wet clutch switching and control of the automatic gearbox are realized through a hydraulic system, the hydraulic control system receives a control signal of a TCU (transmission control unit), the clutch is controlled to be disengaged and engaged through adjusting oil pressure, meanwhile, cooling and lubrication are carried out on the clutch, the automatic control requirement of a vehicle is met, an existing clutch hydraulic control branch circuit carries out switching of an oil way flow direction through a pressure control valve, however, when the clutch pressure control valve breaks down, the clutch cannot be disengaged, and potential safety hazards exist.
In view of this, the present invention provides a wet clutch hydraulic control system, which adopts an additional clutch safety protection branch, and can realize the safety protection of the clutch by reducing the pressure of the main oil path even in the clutch failure mode. Fig. 1 is an embodiment of a wet clutch hydraulic control system according to the present invention.
Referring to fig. 1, a wet clutch hydraulic control system 100 includes a pressure control assembly and an oil drain protection assembly, the pressure control assembly is formed with an oil inlet pipeline 11, an inlet of the oil inlet pipeline 11 is communicated with an oil tank, and an outlet of the oil inlet pipeline 11 is communicated with a clutch; an oil drainage pipeline 21 is formed in the oil drainage protection component, one end of the oil drainage pipeline 21 is communicated with the clutch, the other end of the oil drainage pipeline 21 is communicated with an oil tank, and a control component is arranged on the oil drainage pipeline 21 to open or close the oil drainage pipeline 21; wet clutch hydraulic control system 100 has fuel feeding state and oil return state fuel feeding state, oil inlet pipeline 11 with fluid pump sending extremely in the clutch, control assembly closes draining pipeline 21 oil return state, oil inlet pipeline 11 with fluid backward flow extremely in the oil tank, control assembly opens draining pipeline 21.
In the technical scheme of the invention, in the clutch engaging process, the wet clutch hydraulic control system 100 is in an oil supply state, at the moment, the oil drain pipeline 21 is closed, oil enters the clutch through the oil inlet pipeline 11, in the clutch disengaging process, the wet clutch hydraulic control system 100 is in an oil return state, at this time, the oil drain line 21 is opened, and in the process of returning oil from the clutch to the oil tank, can return to the oil tank through the oil inlet pipeline 11 and the oil drainage pipeline 21 respectively, and is arranged in such a way that the oil drainage process of the clutch is two branches, even if the valve body on the oil inlet pipeline 11 is in failure, oil can still be returned through the oil drainage pipeline 21, therefore, the safety protection of the clutch is realized, the fault of the whole mechanism caused by the fact that the flow direction of the oil inlet pipeline 11 cannot be reversely switched is prevented, and the safety of the whole machine is improved.
In an embodiment of the present invention, the control component includes a one-way valve 221 located on the oil drain pipeline 21, the setting of the one-way valve 221 limits the flow direction of the oil in the oil drain pipeline 21, the oil drain pipeline 21 is closed in the oil supply state by controlling the opening and closing of the one-way valve 221, and is opened in the oil return state, so that the oil in the oil inlet pipeline 11 cannot flow backwards from the oil drain pipeline 21 in the engagement process of the clutch, and the one-way valve has a simple structure and is convenient to install and control.
Specifically, the check valve 221 includes a valve tube with two open ends and a valve core movably mounted in the valve tube; the control assembly further comprises an oil discharge control valve 222 located on the oil discharge pipeline 21, the oil discharge control valve 222 is provided with a chamber, a first oil port and two second oil ports are formed in the side wall of the chamber in a vertically staggered manner, the first oil port is selectively communicated with one of the second oil ports, the check valve 221 is a passive check valve 221 for controlling the valve core through hydraulic pressure and a spring, the check valve 221 is in an open state in an oil return state, an opening at the end is communicated at the time, the spring force and the pressure of the oil are in a balanced state, the oil in the clutch can be guided out to an oil tank through the oil inlet pipeline 11, the oil is led into the check valve 221 by changing the corresponding connection relationship between the first oil port and the two second oil ports in the oil supply state, and the spring force and the pressure of the oil act in the same direction to push the valve core to be in sealing fit with one of the openings, thereby closing the oil drain line 21 and preventing oil from entering the oil drain line 21 from the oil inlet line 11. The structure similar to a two-position three-way valve is utilized for control, and the control function of the three-way valve is convenient to realize.
Further, in an embodiment of the present invention, the oil leakage control valve 222 includes a valve body, a piston rod, and two blocking blocks, a first cavity and a second cavity are formed in the valve body at an interval, a communication channel is formed between the first cavity and the second cavity, the first cavity is used for forming the cavity, and the second cavity is communicated with the oil tank; the piston rod is movably installed along the length direction of the communication channel, one end of the piston rod is located in the second cavity, and the other end of the piston rod extends into the second cavity through the communication channel; the two blocking blocks are arranged at the side end, extending into the second cavity, of the piston rod and are arranged at intervals along the length direction of the piston rod, and the two blocking blocks are arranged corresponding to the two second oil ports; the piston rod moves to drive the two blocking blocks to be respectively in sealing fit with the corresponding second oil ports, so that the other second oil port is communicated with the first oil port. Specifically, in the oil supply state, the second chamber is communicated with the oil tank through a communication pipeline 222a, oil is introduced into the second chamber, the piston rod moves towards the direction of the first chamber under the pushing of oil pressure, at this time, one of the two barrier blocks is in sealing fit with the corresponding second oil port, oil can flow to the first oil port through the other second oil port, the check valve 221 is closed by a buckle at the spring side where the oil enters the check valve 221, and in the oil return state, in order to realize the automatic rebound of the piston rod, a spring is arranged at the other end of the piston rod, after the pressure is released, the piston rod can be pushed to move reversely by the rebound force of the spring to reset, so that the opening and closing effects are realized, the electromagnetic control is different from electromagnetic control, hydraulic automatic driving is adopted, and the oil release control valve 222 can realize the state change along with the oil inlet and oil outlet under the pressurization and the pressure release in the whole oil circuit, the precision is higher, need not the independent connection controller.
In order to realize that oil is respectively guided from different pipelines when the oil enters the oil inlet pipeline 11 and when the oil returns to the oil inlet pipeline 11, in an embodiment of the present invention, the pressure control assembly includes a pressure control valve 12 located on the oil inlet pipeline 11, an oil chamber is formed in the pressure control valve 12, a first outlet and two second outlets are provided on a side wall of the oil chamber, the first outlet is selectively communicated with one of the second outlets, so as to respectively guide the oil returned from the clutch to the oil inlet pipeline 11 to the oil tank in the oil return state, or guide the oil in the oil tank to the clutch through the oil inlet pipeline 11 in the oil supply state. The pressure control valve 12 is a two-position three-way electromagnetic valve, and the regulation and control of different flow paths are realized through the action of an electric control valve core, so that the structure is simple, and the control is convenient.
Moreover, the oil inlet pipeline 11 includes a first oil inlet pipeline 111 and a second oil inlet pipeline 112 connected in sequence, the first oil inlet pipeline 111 is communicated with the clutch, the second oil inlet pipeline 112 is communicated with the oil tank, and the second oil inlet pipeline 112 and the oil drain pipeline 21 are arranged in parallel; the pressure control assembly further includes a pressure control valve 12, and the pressure control valve 12 is located on the second oil feed line 112. So set up, first oil inlet pipe 111 is the public pipeline, second oil inlet pipe 112 with draining pipeline 21 is parallelly connected and sets up, works as pressure control valve 12 on the second oil inlet pipe 112 breaks down, oil in the first oil inlet pipe 111 still can pass through draining pipeline 21 derives to the oil tank in, has improved the complete machine security, the laying of the pipeline of being convenient for and the laying of valve body.
In order to ensure that the pressure in the oil inlet pipeline 11 meets the working requirement of the clutch, the wet clutch hydraulic control system 100 further includes an accumulator 3 located on the oil inlet pipeline 11, and the accumulator 3 can convert the internal stored compression energy into the hydraulic energy required by the oil inlet pipeline 11.
In order to improve the safety control, the wet clutch hydraulic control system 100 further includes a pressure sensor 4 located on the oil inlet pipeline 11, so as to detect the pressure in the oil inlet pipeline 11, so as to facilitate real-time monitoring.
In the whole control system, the pressure control assembly comprises a pressure control valve 12 positioned on the oil inlet pipeline 11; the wet clutch hydraulic control system 100 also includes a terminal controller electrically connected to the pressure control valve 12 and the control assembly. And processing information and issuing instructions through the terminal controller.
Specifically, in the embodiment of the present invention, the first outlet of the pressure control valve 12 is 4B, the two second outlets are 4P and 4T, the first port of the oil drain control valve 222 is 7B, and the two second ports are 7P and 7T, and the engaging step of the clutch a in the wet clutch hydraulic control system 100 is as follows:
firstly, the Terminal Controller (TCU) issues a command to increase the pressure in the oil inlet pipeline 11 from a preset minimum system main pressure to a maximum system main pressure (for example, in one embodiment, the pressure is increased from 3bar to 13 bar);
meanwhile, the Terminal Controller (TCU) sends another instruction to open the pressure control valve 12 on the oil inlet pipeline 11, that is, the pressure control valve 12 is located at the first outlet and is communicated with one of the second outlets under the action of its own electromagnetic force, referring to fig. 1, the second outlet 4P and the first outlet 4B of the pressure control valve 12 are communicated with the oil inlet pipeline 11 and are used for feeding oil in the oil tank into the clutch a through the oil inlet pipeline 11, and the oil feeds back a pressure at the outlet 4A of the clutch pressure control valve 12;
then, oil flows into the clutch a through the energy accumulator 3 and the pressure sensor 4, wherein the energy accumulator 3 absorbs pressure pulses to ensure that the oil pressure supplied to the clutch a is stable, the oil with the stable oil pressure finally flows into a hydraulic cylinder of the clutch a to enable the clutch a to be engaged, and the pressure sensor 4 monitors the pressure of the clutch a in real time;
meanwhile, the oil in the oil tank flows to the communication pipeline 222a of the oil release control valve 222, the interface between the communication pipeline 222a and the second chamber is the oil port 7A in the drawing, at this time, the hydraulic pressure at the oil port 7A is greater than the spring force, the piston rod drives the blocking block to move to enable the second oil port 7P and the first oil port 7B to be communicated to form a passage, and then the oil flows to the check valve 221 so as to push the spring in the check valve 221 to compress and close the check valve 221, and the oil in the oil release pipeline 21 is blocked from flowing to the clutch a.
In an embodiment of the present invention, the first outlet of the pressure control valve 12 is 4B, the two second outlets are 4P and 4T, the first port of the oil drain control valve 222 is 7B, and the two second ports are 7P and 7T, and the separation step of the clutch a of the wet clutch hydraulic control system 100 is as follows:
firstly, the Terminal Controller (TCU) sends out a command to reduce the feed pressure in the oil path from a maximum value to a minimum value (for example, from 13bar to 3bar in one embodiment);
at the same time, another command from the TCU closes the pressure control valve 12, i.e. the pressure control valve 12 returns to its initial position under its own spring force. Oil in the hydraulic cylinder of the clutch a flows to the second outlet 4T through the first outlet 4B of the pressure control valve 12 and finally flows back to the bottom of the oil tank of the gearbox, and the separation of the clutch a is realized.
At this time, the check valve 221 is in a naturally open state, and a passage from the first oil port 7B to the second oil port 7T is formed in the oil release control valve 222, so that oil in the hydraulic cylinder of the clutch a flows back to the bottom of the oil tank of the transmission, and the clutch a is synchronously separated.
That is, in the step of disengaging the clutch a, the oil in the clutch a may flow back to the oil tank through the pressure control valve 12 and the oil release control valve 222 at the same time.
Based on the above separation steps, the method for protecting the clutch a under the wet clutch hydraulic control system 100 includes the following steps:
detecting whether the pressure control valve 12 can switch communication between the two second outlets 4T and 4P;
if not, that is, the pressure control valve 12 fails to switch to the passage from the first outlet 4B to the second outlet 4T, at this time, a command is sent through the TCU to reduce the hydraulic pressure in the oil passage from the maximum value to the minimum value (from 13bar to 3bar), although the pressure control valve 12 cannot return the oil, the check valve 221 is in a naturally open state, and a passage from the first oil port 7B to the second oil port 7T is formed in the oil release control valve 222, so that the oil in the hydraulic cylinder of the clutch a returns to the bottom of the oil tank of the transmission. Therefore, the safety protection of the clutch a is realized, the fault of the whole mechanism caused by the fact that the pressure control valve 12 cannot switch pipelines is prevented, and the safety of the whole machine is improved.
The present invention further provides an automatic transmission, including the wet clutch hydraulic control system 100, where the automatic transmission includes all technical features of the wet clutch hydraulic control system 100, and therefore, the automatic transmission also has technical effects brought by all the technical features, and details are not repeated herein.
In the automatic gearbox, an oil drainage pipeline 21 is additionally arranged in an oil path of the clutch, when oil is normally fed, the oil drainage pipeline 21 does not work, and works when oil is fed, so that the separation time and the power interruption time of the clutch are greatly reduced, the safety protection function mechanism of the whole machine is perfected on a hardware level, even if a pressure control valve 12 on an oil feeding pipeline 11 breaks down, the opening and closing of the clutch can still be kept normal, and the safety of the whole machine is improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A wet clutch hydraulic control system, comprising:
the pressure control assembly is provided with an oil inlet pipeline, an inlet of the oil inlet pipeline is communicated with the oil tank, and an outlet of the oil inlet pipeline is communicated with the clutch; and the number of the first and second groups,
the oil drainage protection component is provided with an oil drainage pipeline, one end of the oil drainage pipeline is communicated with the clutch, the other end of the oil drainage pipeline is communicated with the oil tank, and the oil drainage pipeline is provided with a control component so as to open or close the oil drainage pipeline;
the wet clutch hydraulic control system is provided with an oil supply state and an oil return state, in the oil supply state, the oil inlet pipeline pumps oil into the clutch, the oil drainage pipeline is closed by the control assembly, in the oil return state, the oil inlet pipeline returns the oil into the oil tank, and the oil drainage pipeline is opened by the control assembly;
the control assembly comprises a one-way valve positioned on the oil drainage pipeline;
the one-way valve comprises a valve pipe with two open ends and a valve core movably arranged in the valve pipe;
the control assembly further comprises an oil discharge control valve positioned on the oil drainage pipeline, the oil discharge control valve is provided with a cavity, a first oil port and two second oil ports which are arranged in a vertically staggered mode are arranged on the side wall of the cavity, the first oil port is selectively communicated with one of the second oil ports, so that oil in the clutch is led out to an oil tank through the oil inlet pipeline in the oil return state, or oil in the oil tank is led into the oil drainage pipeline in the oil supply state to push the valve core to be in sealing fit with one of the openings;
the oil release control valve includes:
the oil pump comprises a valve body, wherein a first cavity and a second cavity are formed in the valve body at intervals, a communication channel is formed between the first cavity and the second cavity, the first cavity is used for forming a cavity, and the second cavity is communicated with an oil tank;
the piston rod is movably installed along the length direction of the communicating channel, one end of the piston rod is positioned in the second cavity, and the other end of the piston rod extends into the second cavity through the communicating channel; and the number of the first and second groups,
the two blocking blocks are arranged at the side end, extending into the second cavity, of the piston rod and are arranged at intervals along the length direction of the piston rod, and the two blocking blocks are arranged corresponding to the two second oil ports;
the piston rod moves to drive the two blocking blocks to be respectively in sealing fit with the corresponding second oil ports, so that the other second oil port is communicated with the first oil port.
2. The wet clutch hydraulic control system of claim 1, wherein the pressure control assembly includes a pressure control valve located on the oil inlet pipeline, an oil chamber is formed in the pressure control valve, a first outlet and two second outlets are formed in a side wall of the oil chamber, the first outlet and one of the second outlets are arranged in a vertically staggered manner, and the first outlet is selectively communicated with one of the first outlets so as to respectively guide oil returned from the clutch to the oil inlet pipeline to an oil tank in the oil return state or guide oil in the oil tank to the clutch through the oil inlet pipeline in the oil supply state.
3. The wet clutch hydraulic control system of claim 1, wherein the oil inlet line comprises a first oil inlet line and a second oil inlet line which are connected in sequence, the first oil inlet line is communicated with the clutch, the second oil inlet line is communicated with an oil tank, and the second oil inlet line and the oil drain line are arranged in parallel;
the pressure control assembly further comprises a pressure control valve located on the second oil inlet line.
4. The wet clutch hydraulic control system of claim 1 further comprising an accumulator on the oil feed line for storing compressed energy for conversion to hydraulic energy required by the oil feed line.
5. The wet clutch hydraulic control system of claim 1 further comprising a pressure sensor on the oil feed line to detect pressure in the oil feed line.
6. The wet clutch hydraulic control system of claim 1 wherein the pressure control assembly includes a pressure control valve located on the oil feed line;
the wet clutch hydraulic control system further comprises a terminal controller electrically connected with the pressure control valve.
7. An automatic transmission characterized by comprising the wet clutch hydraulic control system according to any one of claims 1 to 6.
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| CN202110353567.7A CN112984005B (en) | 2021-03-31 | 2021-03-31 | Wet clutch hydraulic control system and automatic gearbox |
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| CN202110353567.7A CN112984005B (en) | 2021-03-31 | 2021-03-31 | Wet clutch hydraulic control system and automatic gearbox |
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| CN112984005B true CN112984005B (en) | 2022-03-29 |
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