CN113790259A - Oil supply and lubricating and cooling system - Google Patents
Oil supply and lubricating and cooling system Download PDFInfo
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- CN113790259A CN113790259A CN202111076768.3A CN202111076768A CN113790259A CN 113790259 A CN113790259 A CN 113790259A CN 202111076768 A CN202111076768 A CN 202111076768A CN 113790259 A CN113790259 A CN 113790259A
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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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0412—Cooling or heating; Control of temperature
- F16H57/0415—Air cooling or ventilation; Heat exchangers; Thermal insulations
- F16H57/0417—Heat exchangers adapted or integrated in the gearing
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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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
- F16H57/0435—Pressure control for supplying lubricant; Circuits or valves therefor
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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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
- F16H57/0441—Arrangements of pumps
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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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
- F16H57/0446—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control the supply forming part of the transmission control unit, e.g. for automatic transmissions
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Details Of Gearings (AREA)
Abstract
The invention discloses an oil supply and lubricating cooling system, which comprises a mechanical oil pump, an electronic oil pump, a switching valve, a main pressure mechanical slide valve, a main pressure electromagnetic valve, a cooling flow electromagnetic valve and a clutch, wherein the mechanical oil pump is connected with the electronic oil pump through the switching valve; wherein, the oil inlets of the mechanical oil pump and the electronic oil pump are connected with the oil pool through the suction filter, and the mechanical oil pump is connected with the engine. An oil outlet of the mechanical oil pump is provided with an oil delivery main path, a first branch is connected with a first control port of the switch valve, and a second branch is connected with an oil inlet of the mechanical oil pump through a safety unloading valve; the third branch passes through the main pressure electromagnetic valve and is connected with a right control port of the main pressure mechanical slide valve; the fourth branch is connected with an oil inlet of the main pressure mechanical slide valve; the fifth branch is connected with a left end control port of the main pressure mechanical slide valve; and the sixth branch is connected with the control system. The invention can reduce the discharge capacity of the mechanical oil pump, meet the requirement of clutch cooling flow under low rotating speed, reduce energy waste when the engine rotates at high rotating speed and improve the transmission efficiency of the gearbox.
Description
Technical Field
The invention relates to the technical field of automobile clutch systems, in particular to an oil supply and lubricating cooling system.
Background
With the increasing of automobile sales in the Chinese market, the demand of matching with the automatic gearbox in the domestic market is also increasing, and most domestic host machine plants also develop the research and development of the double-clutch automatic gearbox. At present, each host factory deals with increasingly serious environmental problems and strict emission regulation requirements by improving the transmission efficiency of a gearbox, and the design of an oil supply system and a lubricating system of a hydraulic system is an important link, and the design of the system directly influences the efficiency of the gearbox.
The conventional automatic gearbox generally supplies oil to a hydraulic system through a mechanical oil pump, and in order to meet the oil supply requirement of the automatic gearbox under the working condition of low rotating speed of an engine, the discharge capacity of the mechanical oil pump needs to be designed to be large, so that when the rotating speed of the engine is high, the efficiency of the hydraulic system of the automatic gearbox is reduced, and energy waste is caused.
Therefore, how to provide a dual-pump oil supply and lubrication cooling system which can reduce the discharge capacity of a mechanical oil pump, meet the requirement of clutch cooling flow at low rotating speed, reduce the energy waste when the engine rotates at high rotating speed and improve the transmission efficiency of a gearbox becomes a technical problem which needs to be solved urgently in the field.
Disclosure of Invention
The invention aims to provide an oil supply and lubricating cooling system, which aims to overcome the defects in the prior art, and meanwhile, the oil supply and lubricating cooling system can reduce the discharge capacity of a mechanical oil pump, meet the requirement of clutch cooling flow at low rotating speed, reduce energy waste when an engine rotates at high rotating speed and improve the transmission efficiency of a gearbox.
According to an aspect of the present invention, there is provided an oil supply and lubrication cooling system including a mechanical oil pump, an electronic oil pump, a switching valve, a line pressure mechanical spool, a line pressure solenoid valve, a cooling flow solenoid valve, and a clutch; oil inlets of the mechanical oil pump and the electronic oil pump are connected with an oil pool through a suction filter, and the mechanical oil pump is connected with an engine;
an oil outlet of the mechanical oil pump is provided with an oil delivery main path, the oil delivery main path is respectively connected with a first branch, a second branch, a third branch, a fourth branch, a fifth branch and a sixth branch, the first branch is connected with a first control port of the switch valve, and the second branch is connected with an oil inlet of the mechanical oil pump through a safety unloading valve; the third branch passes through the main pressure electromagnetic valve and is connected with a right control port of the main pressure mechanical slide valve; the fourth branch is connected with an oil inlet of the main pressure mechanical slide valve; the fifth branch is connected with a left end control port of the main pressure mechanical slide valve; the sixth branch is connected with the control system;
an oil outlet of the electronic oil pump is respectively connected with an oil inlet of the switch valve and the third branch, a third one-way valve is arranged between the electronic oil pump and the third branch, and a first oil outlet of the main pressure mechanical slide valve and an oil outlet of the switch valve are both connected with an oil inlet of the cooling flow electromagnetic valve; and an eighth oil outlet of the cooling flow electromagnetic valve is connected with the clutch.
Optionally, according to the oil supply and lubrication cooling system of the present invention, a first check valve and a second check valve are respectively disposed between the electronic oil pump and the mechanical oil pump and the suction filter.
Optionally, according to the oil supply and lubricating cooling system of the present invention, the main pressure mechanical slide valve is a three-position three-way mechanical slide valve, and a sixth oil outlet is further provided, the sixth oil outlet is connected to the second branch, and a connection point of the sixth oil outlet and the sixth oil outlet is located between the safety unloading valve and the mechanical oil pump.
Optionally, according to the oil supply and lubrication cooling system of the present invention, the cooling flow solenoid valve is a two-position three-way linear solenoid valve, and is further provided with a ninth oil outlet, the ninth oil outlet is connected to the gear set and performs forced lubrication on the gear set, and the cooling flow solenoid valve can adjust oil flows flowing to the clutch pump and the gear set respectively.
Optionally, according to the oil supply and lubricating cooling system of the present invention, a cooler and a pressure filter are further connected between the main pressure mechanical slide valve and the cooling flow solenoid valve, a bypass valve is connected in parallel between an oil inlet and an oil outlet of the pressure filter, and when the pressure filter is blocked, oil can flow from the bypass valve to the cooling flow solenoid valve.
Optionally, according to the oil supply and lubricating cooling system of the present invention, a fourth check valve is further connected in parallel between the oil inlet of the cooler and the oil outlet of the bypass valve, when a pressure difference between two sides of the pressure filter exceeds a set value, the fourth check valve is opened, and the oil flows to the cooling flow solenoid valve through the fourth check valve.
Optionally, according to the oil supply and lubrication cooling system of the present invention, the switching valve is a two-position two-way mechanical spool valve, the switching valve comprises a first position and a second position;
when the switch valve is located at the first position, the oil inlet and the oil outlet of the switch valve are cut off, the third one-way valve is opened under the pressure of the electronic oil pump, and the oil outlet of the electronic oil pump is communicated with the third branch circuit through the third one-way valve;
when the switch valve is located at the second position, an oil inlet and an oil outlet of the switch valve are communicated, the third one-way valve is closed, and the electronic oil pump is communicated with the cooling flow electromagnetic valve through the oil outlet of the switch valve, so that cooling oil is supplemented to the clutch.
Alternatively, according to the oil supply and lubrication cooling system of the present invention, when the pressure provided by the first branch to the control port of the on-off valve is greater than a set value, the on-off valve is switched from the first position to the second position.
Optionally, according to the oil supply and lubrication cooling system of the present invention, when the engine is not started, the mechanical oil pump is in a closed state, the electronic oil pump is started, and the electronic oil pump supplies oil to the control system and the cooling flow solenoid valve through the third check valve for gear pre-engagement and clutch pre-charging.
Alternatively, according to the oil supply and lubrication cooling system of the present invention, when the engine is started, the mechanical oil pump is turned on, and as the rotation speed of the engine gradually increases, the electronic oil pump is turned off when the mechanical oil pump can satisfy the oil supply amount of the system.
The invention has the following beneficial effects:
1. by utilizing the technical scheme, when the engine is not started, the electronic oil pump works to provide system oil, realize the pre-engagement of gears and the pre-filling of the clutch, and also distribute part of oil to the branch of the cooling and lubricating system, thereby meeting the requirements of the static start and stop of the whole vehicle and the start and stop of the sliding vehicle.
2. Through this technical scheme, set up the cooling flow solenoid valve, through the operating position of control cooling flow solenoid valve, can be prior to guarantee the lubricated demand of gear train, also can guarantee the lubricated flow relatively stable of gear train when adjusting clutch cooling flow according to system operating condition.
3. Through this technical scheme, can reduce the discharge capacity of mechanical oil pump, satisfy clutch cooling flow demand under the low rotational speed, reduce clutch ablation risk, the energy waste when reducing the high rotational speed of engine simultaneously improves gearbox transmission efficiency.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of the disclosed oil supply and lubrication cooling system;
FIG. 2 is a branch diagram of the oil supply and lubrication cooling system disclosed in the present invention.
Description of reference numerals: 1-an oil sump; 2-a suction filter; 3-a first one-way valve; 4-a second one-way valve; 5-an engine;
6-a mechanical oil pump; 6A-a first oil inlet; 6B-a first oil outlet;
7-an electronic oil pump; 7A-a second oil inlet; 7B-a second oil outlet;
8-a switch valve; 8P-a third oil inlet; 8A-a first control port; 8B-a third oil outlet;
9-a third one-way valve; 10-a safety relief valve; 11-a primary pressure sensor;
12-a main pressure mechanical spool valve; 12P-a fourth oil inlet; 12a1 — second control port; 12a2 — third control port; 12B 1-a fifth oil outlet; 12B 2-a sixth oil outlet;
13-main pressure solenoid valve; 13P-a fifth oil inlet; 13B-a seventh oil outlet;
14-a fourth one-way valve; 15-a cooler; 16-a bypass valve; 17-a pressure filter;
18-cooling flow solenoid valve; 18P-a sixth oil inlet; 18B 1-eighth oil outlet; 18B 2-ninth oil outlet;
19-a clutch; 20-gear set; 21-a control system;
201-a first branch; 202-a second branch; 203-third branch; 204-fourth branch; 205-fifth branch; 206-sixth branch; 101-seventh branch; 102-eighth branch; 301-ninth leg; 302-tenth branch; 401-eleventh branch; 402-twelfth branch; 403-the thirteenth branch; 501-a fourteenth branch; 502-fifteenth branch.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
According to fig. 1 and 2, the present invention provides an oil supply and lubrication cooling system, comprising a mechanical oil pump 6, an electronic oil pump 7, a switching valve 8, a line pressure mechanical spool valve 12, a line pressure solenoid valve 13, a cooling flow solenoid valve 18, and a clutch 19; oil inlets of the mechanical oil pump 6 and the electronic oil pump 7 are connected with the oil pool 1 through the suction filter 2, and the mechanical oil pump 6 is connected with the engine 5;
an oil outlet of the mechanical oil pump 6 is provided with an oil delivery main path, the oil delivery main path is respectively connected with a first branch 201, a second branch 202, a third branch 203, a fourth branch 204, a fifth branch 205 and a sixth branch 206, the first branch 201 is connected with a first control port 8A of the switch valve 8, and the second branch 202 is connected with an oil inlet of the mechanical oil pump 6 through the safety unloading valve 10; the third branch 203 passes through the line pressure solenoid valve 13 and is connected to the third control port 12a2 of the line pressure mechanical spool valve 12; the fourth branch 204 is connected with an oil inlet of the main pressure mechanical slide valve 12; the fifth branch 205 is connected to the second control port 12a1 of the main pressure mechanical spool valve 12; the sixth branch 206 is connected with the control system 21;
an oil outlet of the electronic oil pump 7 is respectively connected with an oil inlet of the switch valve 8 and the third branch 203, a third one-way valve 9 is arranged between the electronic oil pump 7 and the third branch 203, the main pressure mechanical slide valve 12 is provided with a fifth oil outlet 12B1, and the fifth oil outlet 12B1 and the oil outlet of the switch valve 8 are both connected with the oil inlet of the cooling flow electromagnetic valve 18; the eighth oil outlet 18B1 of the cooling flow rate solenoid valve 18 is connected to the clutch 19.
Oil enters the suction filter 2 from the oil pool 1 and then is divided into a seventh branch 101 and an eighth branch 102, wherein the oil in the seventh branch 101 reaches an oil inlet of the mechanical oil pump 6 through the second check valve 4, and the mechanical oil pump 6 converts low-pressure oil into high-pressure oil under the drive of the engine 5 and reaches an oil outlet of the mechanical oil pump 6;
after flowing out of the oil outlet, the oil is divided into six branches, and the oil in the first branch 201 flows to a control port of the switch valve 8; the oil in the second branch 202 flows to one side of the safety unloading valve 10, when the pressure of the system reaches a certain pressure, for example, 30bar, the pressure unloading can be realized, and the oil returns to the oil inlet of the mechanical oil pump 6; the oil of the third branch 203 flows to the fifth oil inlet 13P of the main pressure solenoid valve 13, then passes through the main pressure solenoid valve 13 to the seventh oil outlet 13B, and then flows to the third control port 12a2 of the main pressure mechanical slide valve 12; the oil of the fourth branch 204 flows to a fourth oil inlet 12P of the main pressure mechanical slide valve 12; the fifth branch 205 oil flows to the second control port 12a1 of the main pressure mechanical spool valve 12; the sixth branch 206 is connected to the control system 21 for supplying pressure control oil to the control system 21, and the sixth branch 206 is further provided with a main pressure sensor 11 for detecting the pressure of the oil in the control system 21.
The oil in the eighth branch 102 branched from the suction filter 2 enters the second oil inlet 7A of the electronic oil pump 7 through the first check valve 3, the electronic oil pump 7 is driven by the motor to deliver the low-pressure oil in the second oil inlet 7A to the second oil outlet 7B of the electronic oil pump 7 to be converted into high-pressure oil, and then the high-pressure oil is further divided into a ninth branch 301 and a tenth branch 302, wherein the oil in the ninth branch 301 flows to one side of the third check valve 9 (the third branch 203), while the oil in the tenth branch 302 flows to the third oil inlet 8P of the switch valve 8, when the switch valve 8 works at the first position (the current position), the oil is stopped at the third oil inlet 8P, causing the oil pressure in the branches and the branch to rise, when the pressure in the ninth branch 301 is greater than the pressure in the first branch 201 (the other side of the third check valve 9) and exceeds a certain value, for example, 0.3bar, the third check valve 9 is opened, the oil flows from the ninth branch 301 to the third branch 203, and then the oil is divided into six branches which are equal to six branches of the first oil outlet 6B of the mechanical pump; when the first control port 8A of the on-off valve 8 is subjected to the pressure action of the branch, for example, the pressure is greater than 9bar, the on-off valve 8 is switched to the second working position, the pressure oil output by the electronic oil pump 7 flows to the third oil outlet 8B through the on-off valve 8, and then reaches the third oil inlet 8P of the cooling flow solenoid valve 18 through the eleventh branch 401;
the oil distributed from the fourth branch 204 reaches the fourth oil inlet 12P of the main piezo mechanical spool valve 12, and after the adjustment of the main piezo mechanical spool valve 12, a part of the oil may flow to the fifth oil outlet 12B1 of the main piezo mechanical spool valve 12, and another part of the oil may flow to the sixth oil outlet 12B2 of the main piezo mechanical spool valve 12; the oil from the sixth oil outlet 12B2 returns to the first oil inlet 6A of the mechanical oil pump 6.
The oil flowing to the fifth oil outlet 12B1 continues to flow to the twelfth branch 402 and the thirteenth branch 403 respectively, and flows to the pressure filter 17 after passing through the cooler 15 after passing through the twelfth branch 402.
The oil liquid at the third oil inlet 8P reaches the third oil outlet 8B and the third oil outlet 8B through the cooling flow solenoid valve 18, flows to the clutch 19 through the fourteenth branch 501 for cooling, flows to the gear set 20 through the fifteenth branch 502 for forced lubrication, and can control the cooling flow solenoid valve 18 according to the flow demand and adjust the flow of the fourteenth branch 501 and the fifteenth branch 502.
Furthermore, a first check valve 3 and a second check valve 4 are respectively arranged between the electronic oil pump 7 and the mechanical oil pump 6 and the suction filter 2, so that oil is prevented from flowing back to the oil pool 1.
Further, the main pressure mechanical slide valve 12 is a three-position three-way mechanical slide valve, which is further provided with a sixth oil outlet 12B2, the sixth oil outlet 12B2 is connected with the second branch 202, and the connection point of the two is located between the safety unloading valve 10 and the mechanical oil pump 6.
Further, the cooling flow solenoid valve 18 is a two-position three-way linear solenoid valve, and is further provided with a ninth oil outlet 18B2, the ninth oil outlet 18B2 is connected with the gear set 20 and performs forced lubrication on the gear set 20, and the cooling flow solenoid valve 18 can adjust oil flows flowing to the clutch pump and the gear set 20 respectively. By controlling the operating position of the cooling flow solenoid valve 18, the demand for lubrication of the gear set 20 can be preferentially ensured, and the cooling flow of the clutch 19 can be adjusted and the lubrication flow of the gear set 20 can be relatively stable according to the operating state of the system.
Further, a cooler 15 and a pressure filter 17 are connected between the main pressure mechanical slide valve 12 and the cooling flow solenoid valve 18, a bypass valve 16 is connected between an oil inlet and an oil outlet of the pressure filter 17 in parallel, and when the pressure filter 17 is blocked, oil can flow from the bypass valve 16 to the cooling flow solenoid valve 18.
Still further, a fourth check valve 14 is connected in parallel between an oil inlet of the cooler 15 and an oil outlet of the bypass valve 16, when the pressure difference between two sides of the pressure filter 17 exceeds a set value, the fourth check valve 14 is opened, and the oil flows to the cooling flow solenoid valve 18 through the fourth check valve 14. When the pressure difference between the two sides of the fourth check valve 14 exceeds a certain value, for example, 3bar (when the cooler 15 is blocked or the flow rate required for cooling and lubrication is too large at low temperature and normal temperature, the pressure difference between the two sides of the fourth check valve 14 can be larger than 3bar), the fourth check valve 14 is opened, the through-flow capacity of the system is increased, oil reaches the third oil inlet 8P of the cooling flow solenoid valve 18 through the fourth check valve 14, and the through-flow capacity requirement of the system under different working conditions is met.
Further, the switch valve 8 is a two-position two-way mechanical slide valve, and the switch valve 8 comprises a first position and a second position;
when the switch valve 8 is located at the first position, the oil inlet and the oil outlet of the switch valve 8 are cut off, the third check valve 9 is opened under the pressure of the electronic oil pump 7, and the oil outlet of the electronic oil pump 7 is communicated with the third branch 203 through the third check valve 9. When the switch valve 8 is located at the second position, the oil inlet and the oil outlet of the switch valve 8 are communicated, the third one-way valve 9 is closed, and the electronic oil pump 7 is communicated with the cooling flow solenoid valve 18 through the oil outlet of the switch valve 8, so that the clutch 19 is replenished with cooling oil.
Still further, when the pressure supplied from the first branch 201 to the control port of the on-off valve 8 is greater than the set value, the on-off valve 8 is switched from the first position to the second position. When the first control port 8A is subjected to the pressure of the branch, for example, the pressure is greater than 9bar, the on-off valve 8 is switched from the first position to the second position, and the pressure oil output by the electronic oil pump 7 flows to the third oil outlet 8B of the on-off valve 8 through the on-off valve 8 and then reaches the third oil inlet 8P of the cooling flow solenoid valve 18 through the branch.
Further, when the engine 5 is not started, the mechanical oil pump 6 is in a closed state, the electronic oil pump 7 is started, and the electronic oil pump 7 supplies oil to the control system 21 and the cooling flow rate solenoid valve 18 through the third check valve 9 for advance engagement of the gear and pre-charging of the clutch 19.
Still further, when the engine 5 is started and the mechanical oil pump 6 is turned on, the electronic oil pump 7 is turned off when the mechanical oil pump 6 can satisfy the oil supply amount of the system as the rotation speed of the engine 5 is gradually increased.
1. The cooperative working principle of the mechanical pump and the electronic oil pump 7 is as follows:
when the engine 5 does not work, the mechanical oil pump 6 does not work, the electronic oil pump 7 works, the switch valve 8 works at the current position, the pressure of the seventh oil outlet 13B is controlled by the main pressure electromagnetic valve 13, so that the pressure of the first branch 201 is smaller than 9bar, oil output by the electronic oil pump 7 is input to the third branch 203 through the third check valve 9, control oil is provided for the control system 21, and cooling and lubricating oil is provided for the cooling branch through the main pressure mechanical slide valve 12. The control oil provided can be used for advancing the engagement of the gear and for pre-charging the clutch 19.
When the engine 5 starts to work and the rotating speed is controlled to be 800-2500 rpm, the mechanical oil pump 6 starts to work, the electronic oil pump 7 works simultaneously, the pressure of the seventh oil outlet 13B is controlled by the main pressure solenoid valve 13, so that the pressure of the first branch 201 is smaller than 9bar, the switch valve 8 still works at the current position, and the mechanical oil pump 6 and the electronic oil pump 7 can simultaneously provide system oil for the fourth branch 204.
When the engine 5 starts to work and the rotating speed is controlled to be 800-2500 rpm, the mechanical oil pump 6 starts to work, the electronic oil pump 7 works simultaneously, the pressure of the seventh oil outlet 13B is controlled by the main pressure solenoid valve 13, so that the pressure of the first branch 201 is larger than 9bar, the switch valve 8 works at the second position, the third one-way valve 9 is closed, the mechanical oil pump 6 provides system oil for the fourth branch 204, the electronic oil pump 7 provides oil for the eleventh branch 401, and cooling oil for the clutch 19 is supplemented.
When the engine 5 works and the rotating speed is higher than 2500rpm, the mechanical oil pump 6 works, the provided oil meets the requirements of the system, the electronic oil pump 7 stops working, and oil output is not provided any more.
2. Working principle of the cooling flow solenoid valve 18:
the cooling flow solenoid valve 18 is a normally open linear solenoid valve, and in order to ensure that the cooling branch can be supplied with oil when the cooling flow solenoid valve 18 fails;
the flow areas of eighth outlet port 18B1 and ninth outlet port 18B2 of cooling flow solenoid valve 18 decrease as cooling flow solenoid valve 18 transitions to operating position two, ensuring that during adjustment of the oil flow rate at eighth outlet port 18B1, the oil flow rate at ninth outlet port 18B2 can be maintained within a relatively stable range, and when cooling flow solenoid valve 18 is in operating position two, eighth outlet port 18B1 is closed, and the flow capacity at ninth outlet port 18B2 reaches a minimum.
When the rotating speed of the engine 5 does not work, the mechanical oil pump 6 does not work, the electronic oil pump 7 works to provide about 3-5L/min oil, at this time, in order to preferentially meet the lubricating requirement of the gear set 20, the cooling flow electromagnetic valve 18 is controlled to work at the second position, the sixth oil inlet 18P and the ninth oil outlet 18B2 are cut off, cooling oil supply is stopped, the sixth oil inlet 18P and the eighth oil outlet 18B1 are communicated, and the lubricating flow is guaranteed.
When the engine 5 works and the rotating speed is less than 2500rpm, the mechanical oil pump 6 outputs oil, the electronic oil pump 7 outputs oil in a matching manner, at this time, the oil supply amount of the system can meet the lubricating requirement of the gear set 20, and the cooling flow electromagnetic valve 18 is controlled to work to a first position (current position), so that the sixth oil inlet 18P is respectively communicated with the eighth oil outlet 18B1 and the ninth oil outlet 18B2, and the cooling oil supply of the clutch 19 and the lubricating oil supply of the gear set 20 are realized.
When the engine 5 works and the rotating speed is more than 2500rpm, the electronic oil pump 7 stops supplying oil, and the flow of the oil output by the mechanical oil pump 6 exceeds the oil consumption of the cooling and lubricating system, at the moment, the cooling flow electromagnetic valve 18 can be controlled to transit to the second working position, so that the purpose of adjusting the cooling and lubricating flow is achieved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. An oil supply and lubricating cooling system is characterized by comprising a mechanical oil pump, an electronic oil pump, a switch valve, a main pressure mechanical slide valve, a main pressure electromagnetic valve, a cooling flow electromagnetic valve and a clutch; oil inlets of the mechanical oil pump and the electronic oil pump are connected with an oil pool through a suction filter, and the mechanical oil pump is connected with an engine;
an oil outlet of the mechanical oil pump is provided with an oil delivery main path, the oil delivery main path is respectively connected with a first branch, a second branch, a third branch, a fourth branch, a fifth branch and a sixth branch, the first branch is connected with a first control port of the switch valve, and the second branch is connected with an oil inlet of the mechanical oil pump through a safety unloading valve; the third branch passes through the main pressure electromagnetic valve and is connected with a right control port of the main pressure mechanical slide valve; the fourth branch is connected with an oil inlet of the main pressure mechanical slide valve; the fifth branch is connected with a left end control port of the main pressure mechanical slide valve; the sixth branch is connected with the control system;
an oil outlet of the electronic oil pump is respectively connected with an oil inlet of the switch valve and the third branch, a third one-way valve is arranged between the electronic oil pump and the third branch, and a fifth oil outlet of the main pressure mechanical slide valve and an oil outlet of the switch valve are both connected with an oil inlet of the cooling flow electromagnetic valve; and an eighth oil outlet of the cooling flow electromagnetic valve is connected with the clutch.
2. The oil supply and lubrication cooling system according to claim 1, wherein a first check valve and a second check valve are respectively provided between the electronic oil pump and the mechanical oil pump and the suction filter.
3. The oil supply and lubricating and cooling system according to claim 1, wherein the main pressure mechanical slide valve is a three-position three-way mechanical slide valve, and is further provided with a sixth oil outlet, the sixth oil outlet is connected with the second branch, and a connection point of the sixth oil outlet and the second branch is located between the safety unloading valve and the mechanical oil pump.
4. The oil supply and lubrication cooling system according to claim 1, wherein the cooling flow solenoid valve is a two-position three-way linear solenoid valve, and further comprises a ninth oil outlet, the ninth oil outlet is connected with and used for forcibly lubricating the gear set, and the cooling flow solenoid valve is capable of adjusting oil flow rates flowing to the clutch pump and the gear set respectively.
5. The oil supply and lubricating and cooling system of claim 1, wherein a cooler and a pressure filter are further connected between the main pressure mechanical slide valve and the cooling flow solenoid valve, a bypass valve is connected in parallel between an oil inlet and an oil outlet of the pressure filter, and when the pressure filter is blocked, oil can flow from the bypass valve to the cooling flow solenoid valve.
6. The oil supply and lubricating and cooling system according to claim 5, wherein a fourth check valve is connected in parallel between the oil inlet of the cooler and the oil outlet of the bypass valve, and when the pressure difference across the pressure filter exceeds a set value, the fourth check valve is opened, and oil flows to the cooling flow solenoid valve through the fourth check valve.
7. The oil supply and lubrication cooling system according to claim 1, wherein said switching valve is a two-position two-way mechanical spool valve, said switching valve including a first position and a second position;
when the switch valve is located at the first position, the oil inlet and the oil outlet of the switch valve are cut off, the third one-way valve is opened under the pressure of the electronic oil pump, and the oil outlet of the electronic oil pump is communicated with the third branch circuit through the third one-way valve;
when the switch valve is located at the second position, an oil inlet and an oil outlet of the switch valve are communicated, the third one-way valve is closed, and the electronic oil pump is communicated with the cooling flow electromagnetic valve through the oil outlet of the switch valve, so that cooling oil is supplemented to the clutch.
8. The oil supply and lubrication cooling system according to claim 7, wherein the switching valve is switched from the first position to the second position when the pressure provided by the first branch to the control port of the switching valve is greater than a set value.
9. The oil supply and lubrication cooling system according to claim 1, wherein when the engine is not started, the mechanical oil pump is in a shut-off state, the electronic oil pump is started, and the electronic oil pump supplies oil to the control system and the cooling flow solenoid valve through the third check valve for gear pre-engagement and clutch pre-charge.
10. The system of claim 9, wherein the mechanical oil pump is turned on when the engine is started, and the electronic oil pump is turned off when the mechanical oil pump can meet the oil supply amount of the system as the engine speed gradually increases.
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| CN202111076768.3A CN113790259A (en) | 2021-09-14 | 2021-09-14 | Oil supply and lubricating and cooling system |
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