CN113090750A - Hydraulic system of automatic transmission - Google Patents
Hydraulic system of automatic transmission Download PDFInfo
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- CN113090750A CN113090750A CN201911351390.6A CN201911351390A CN113090750A CN 113090750 A CN113090750 A CN 113090750A CN 201911351390 A CN201911351390 A CN 201911351390A CN 113090750 A CN113090750 A CN 113090750A
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- oil
- valve
- hydraulic
- pump
- hydraulic pump
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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
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H61/0025—Supply of control fluid; Pumps therefore
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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
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H2061/0037—Generation or control of line pressure characterised by controlled fluid supply to lubrication circuits of the gearing
Abstract
The invention relates to the technical field of hydraulic control of a transmission, and discloses a hydraulic system of an automatic transmission, which comprises a first oil way, a second oil way, a first oil hydraulic pump, a second oil hydraulic pump and a reversing valve, wherein the first oil way is communicated with a main oil way of a clutch and a gear shifting and parking device, the second oil way is communicated with a cooling and lubricating oil way of the clutch and a shaft gear device, the first oil hydraulic pump is connected with the first oil way, the second oil hydraulic pump is communicated with the second oil way and used for supplying cooling and lubricating oil to the clutch and the shaft gear device, and the reversing valve is arranged between the first oil hydraulic pump and a pressure relief container and is provided with a first valve position and a second valve position; when the reversing valve is in the first valve position, the first oil pressure pump supplies oil to the main oil way through the first oil way, and when the reversing valve is in the second valve position, the first oil pressure pump is communicated with the pressure relief container. The structure and the arrangement form of the valve can be simplified, the weight reduction, the system simplification and the cost reduction are facilitated, the arrangement space is saved, and the system failure rate is reduced.
Description
Technical Field
The invention relates to the technical field of hydraulic control of a transmission, in particular to a hydraulic system of an automatic transmission.
Background
At present, in a hydraulic system scheme for performing actuation control and cooling on a gear shifting actuating mechanism of a transmission, a low-pressure loop and a high-pressure loop are generally included, when an actuating element of the high-pressure loop does not work, a high-pressure oil pump is not needed to supply oil, oil output by the high-pressure oil pump is unloaded through a special reversing valve with a special structure or is introduced into a low-pressure oil way on the other side through the reversing valve, so that the output or unloading pressure of the high-pressure pump is reduced, and the effect of improving the efficiency of the hydraulic system is.
The prior art proposes some technical solutions to solve this problem:
for example, when the high-pressure loop does not need the high-pressure pump to supply oil, the oil output by the high-pressure pump is directly unloaded through the third reversing position of the three-position reversing valve, the structure and the principle of the three-position reversing valve used in the technical scheme are relatively complex, the three-position reversing valve occupies a large hardware arrangement space, and the hardware design and manufacturing cost and the control difficulty are increased.
Another implementation scheme is as follows: when the high-pressure loop does not need the high-pressure pump to supply oil, oil output by the high-pressure pump is unloaded or introduced into a cooling and lubricating oil way through a two-position reversing valve, but other control valves are arranged in the unloading oil way, so that the liquid resistance is increased, the unloading pressure is high, meanwhile, the oil way is complex in arrangement, the design and arrangement difficulty of hardware is increased, and the fault rate is increased.
In addition, in the other technical scheme, a clutch may be arranged between an electronic pump for driving the double pumps and the low-pressure pump, so that the complexity of system hardware is increased, and the clutch needs to be controlled independently, so that the failure rate of the system is increased.
Therefore, how to simplify the system structure, save the occupied space, and reduce the manufacturing cost and the process difficulty while ensuring the effective unloading of the oil output by the high-pressure oil pump is an important technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a hydraulic system of an automatic transmission, which can simplify the structure and the arrangement form of a valve, is beneficial to reducing weight, simplifying the system and reducing cost, and a clutch is not arranged in the hydraulic system, thereby being beneficial to saving the arrangement space and reducing the failure rate of the system.
In order to achieve the above object, the present invention provides a hydraulic system of an automatic transmission, including a first oil passage communicating with a main oil passage of a clutch and a shift and parking device, for supplying hydraulic oil to the clutch and the shift and parking device;
the second oil way is communicated with the cooling and lubricating oil ways of the clutch and the shaft tooth device and is used for providing cooling and lubricating oil for the clutch and the shaft tooth device;
a first oil pressure pump connected to the first oil passage;
a second oil pressure pump communicated with the second oil passage;
the reversing valve is arranged between the first oil pressure pump and the pressure relief container and is provided with a first valve position and a second valve position; and when the reversing valve is positioned at the first valve position, the first oil pressure pump supplies oil to the main oil way through the first oil way, and when the reversing valve is positioned at the second valve position, the first oil pressure pump is communicated with the pressure relief container.
Preferably, a common drive device is connected between the first hydraulic pump and the second hydraulic pump.
Preferably, the reversing valve is provided with an electromagnet for controlling the switching valve position.
Preferably, the first oil passage is connected to a check valve that allows only one-way flow of hydraulic oil from an oil outlet of the first oil pressure pump to the main oil passage, and the first oil pressure pump is communicated with the main oil passage through the check valve when the selector valve is in the first valve position.
Preferably, an oil outlet of the one-way valve and the main oil way are directly connected with an energy accumulator.
Preferably, a filter is arranged on the first oil path and at an oil inlet of the one-way valve.
Preferably, the oil inlets of the first oil pressure pump and the second oil pressure pump are both provided with filters.
Preferably, the first hydraulic pump and the second hydraulic pump are connected to a common pressure relief container or are connected to different pressure relief containers.
Preferably, the driving device is an electric motor.
Compared with the prior art, the invention has the beneficial effects that:
the hydraulic system of the automatic transmission comprises a first oil path, a second oil path, a first oil hydraulic pump, a second oil hydraulic pump and a reversing valve, wherein the first oil path is communicated with a main oil path (a high-pressure loop) of a clutch and a gear shifting and parking device and used for supplying hydraulic oil to the clutch and the gear shifting and parking device, the second oil path is communicated with a cooling and lubricating oil path (a low-pressure loop) of the clutch and a shaft gear device and used for supplying cooling and lubricating oil to the clutch and the shaft gear device, the first oil hydraulic pump is connected with the first oil path, the second oil hydraulic pump is communicated with the second oil path and used for supplying cooling and lubricating oil to the clutch and the shaft gear device, the reversing valve is arranged between the first oil hydraulic pump and a pressure relief container, the reversing valve is a two-position two-way valve, and when the reversing valve is in the first valve position, the first oil hydraulic pump supplies oil to the main oil path through the first oil path, the hydraulic system is used for controlling the clutch and the gear shifting and parking device, when the pressure in the main oil way is enough to meet the requirement, the reversing valve can be switched to the second valve position, the oil outlet of the first oil pressure pump is communicated with the pressure relief container, the output oil of the first oil pressure pump can only pass through the reversing valve at lower pressure, and therefore direct no-load unloading of the first oil pressure pump is achieved.
Drawings
FIG. 1 is a schematic illustration of a hydraulic system for an automatic transmission provided in accordance with an embodiment of the present invention;
fig. 2 is a schematic diagram of a hydraulic system of another automatic transmission according to an embodiment of the present invention.
10, a first oil pressure pump; 11. a first oil passage; 20. a second hydraulic pump; 21. a second oil passage; 30. a diverter valve; 31. a first valve position; 32. a second valve position; 33. an electromagnet; 40. a main oil path; 50. cooling the lubricating oil path; 60. a pressure relief container; 61. a first pressure relief container; 62. a second pressure relief container; 70. a drive device; 80. a one-way valve; 90. a filter; 100. an accumulator.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. In addition, the terms "first", "second", and the like are employed in the present invention to describe various information, but the information should not be limited to these terms, which are used only to distinguish the same type of information from each other. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
Referring to fig. 1, a hydraulic system of an automatic transmission according to the present invention is schematically illustrated, and includes a first oil passage 11, a second oil passage 21, a first hydraulic pump 10, a second hydraulic pump 20, and a selector valve 30, where the first hydraulic pump 10 is a high-pressure pump, and the second hydraulic pump 20 is a low-pressure pump. The first oil path 11 is communicated with a main oil path 40 (high-pressure loop) of the clutch and the gear shifting and parking device, and is used for providing hydraulic oil for the clutch and the gear shifting and parking device. The second oil passage 21 communicates with a cooling and lubricating oil passage 50 (low-pressure circuit) of the clutch and gear device, and is used for supplying cooling and lubricating oil to the clutch and gear device. The first hydraulic pump 10 is connected to the first oil passage 11, the second hydraulic pump 20 is communicated with the second oil passage 21, the change valve 30 is provided between the first hydraulic pump 10 and the pressure relief container 60, and more importantly, the change valve 30 has a first valve position 31 and a second valve position 32; when the direction change valve 30 is in the first valve position 31, the first hydraulic pump 10 supplies oil to the main oil passage 40 through the first oil passage 11, and when the direction change valve 30 is in the second valve position 32, the first hydraulic pump 10 is communicated with the pressure relief container 60.
In the hydraulic system of the automatic transmission based on the above technical features, the direction changing valve 30 is disposed between the first hydraulic pump 10 and the pressure relief container 60, and the direction changing valve 30 has the first valve position 31 and the second valve position 32, specifically, a two-position two-way valve, when the direction changing valve 30 is located at the first valve position 31, the first hydraulic pump 10 supplies oil to the main oil passage 40 through the first oil passage 11 to control the clutch, the gear shifting and the parking device, when the pressure in the main oil passage 40 is sufficient to meet the requirement, the direction changing valve 30 can be switched to the second valve position 32, the oil outlet of the first hydraulic pump 10 is communicated with the pressure relief container 60, so that the output oil of the first hydraulic pump 10 can only pass through the direction changing valve 30 at a lower pressure, thereby realizing the direct no-load unloading of the first hydraulic pump 10, and therefore, the hydraulic system simplifies the arrangement of hydraulic components and effectively reduces the complexity of control logic, the unloading mode unloads the output oil of the first oil pressure pump 10, reduces the liquid resistance of an unloading oil way as far as possible, improves the efficiency of a hydraulic system, and is beneficial to saving hardware arrangement space and reducing the system failure rate because the clutch is not arranged.
Specifically, a common driving device 70 is connected between the first hydraulic pump 10 and the second hydraulic pump 20, and drives the first hydraulic pump 10 and the second hydraulic pump 20 to operate. The driving device 70 is preferably a motor, which can be controlled at any rotation speed, and the control mode is more accurate and efficient. The present invention eliminates the clutch between the oil pump and the driving device 70, and can achieve the greatest optimization in terms of weight, space, and cost.
Preferably, the reversing valve 30 is provided with an electromagnet 33 for controlling the switching valve position, the reversing valve 30 switches between the first valve position 31 and the second valve position 32 through the electromagnet 33 and a spring, and the electromagnet 33 can adopt an on-off control form or a proportional control form, and in the embodiment, the on-off control form is preferably adopted. The change valve 30 is biased by a spring to a first valve position 31, so that the first hydraulic pump 10 supplies oil to the main oil passage 40 through the first oil passage 11, and when the pressure in the first oil passage 11 satisfies a use requirement, the spring is actuated by the electromagnet 33, the change valve 30 is switched to a second valve position 32, so that the first hydraulic pump 10 is communicated with the relief container 60.
In a preferred embodiment, a check valve 80 is connected to the first oil passage 11, the check valve 80 only allows the hydraulic oil to flow from the oil outlet of the first hydraulic pump 10 to the main oil passage 40 in a single direction, and the check valve 80 is disposed such that the hydraulic oil can flow only in one direction, thereby preventing the hydraulic oil from flowing in the opposite direction. When the direction valve 30 is located at the first valve position 31, the first oil pressure pump 10 is communicated with the main oil passage 40 through the check valve 80, so as to provide hydraulic oil for the main oil passage 40. When the direction valve 30 is in the second valve position 32, the output oil pressure of the first oil pressure pump 10 is low, and the check valve 80 can prevent the oil pressure of the main oil passage 40 from being reduced due to the backflow of the hydraulic oil in the main oil passage 40.
Further preferably, the oil outlet of the check valve 80 is directly connected with the main oil path 40 by an energy accumulator 100, the energy accumulator 100 is an energy storage device, and can convert the energy in the main oil path 40 into compression energy to be stored at a proper time, and when the main oil path 40 needs, the compression energy is converted into hydraulic energy to be released and supplied to the main oil path 40 again, so as to avoid the too high or too low oil pressure of the hydraulic system; when the instantaneous pressure in the main oil path 40 (high-pressure circuit) increases, the energy accumulator 100 can absorb the energy of the part, convert the energy in the main oil path 40 into compression energy and store the compression energy, and ensure that the pressure of the whole system is normal.
Specifically, the first hydraulic pump 10 and the second hydraulic pump 20 may be connected to different pressure relief containers 60, as shown in fig. 1, the first hydraulic pump 10 is connected to a first pressure relief container 61, and the second oil pump is connected to a second pressure relief container 62. It should be understood that the first oil pressure pump 10 and the second oil pressure pump 20 may also be connected to a common pressure relief container 60, that is, the first oil pressure pump 10 and the second oil pressure pump 20 share one pressure relief container 60, a spaced filter net is disposed in the pressure relief container 60, and oil inlets of the first oil pressure pump 10 and the second oil pressure pump 20 are respectively located at two sides of the spaced filter net.
Preferably, a filter 90 is disposed on the first oil path 11 and at an oil inlet of the check valve 80 to filter out impurities in the hydraulic oil, so as to ensure the cleanliness of the hydraulic oil entering the main oil path 40. Further preferably, the oil inlets of the first oil pressure pump 10 and the second oil pressure pump 20 are both provided with a filter 90, so as to ensure oil cleanliness and improve system robustness.
It should be understood that, referring to fig. 2, the change-over valve 30 may also be configured in another substantially same change, that is, when the change-over valve 30 is in the first valve position 31, the first oil pressure pump 10 is communicated with the pressure relief container 60, when the change-over valve 30 is in the second valve position 32, the first oil pressure pump 10 supplies oil to the main oil passage 40 through the first oil passage 11, the change-over valve 30 is pre-tensioned at the first valve position 31 by a spring, when oil needs to be supplied to the main oil passage 40, the change-over valve 30 is switched to the second valve position 32 by the electromagnet 33, and when the oil pressure in the main oil passage 40 is sufficiently large, the change-over valve 30 is switched back to the first valve position 31, so as to achieve direct no-load unloading of the first oil pressure pump 10.
In summary, in the hydraulic system of the automatic transmission of the present invention, the direction-changing valve 30 is disposed between the first hydraulic pump 10 and the pressure-releasing container 60, and the direction-changing valve 30 is a two-position two-way valve, when the direction-changing valve 30 is at the first valve position 31, the first hydraulic pump 10 supplies oil to the main oil passage 40 through the first oil passage 11 to control the clutch, the gear shifting and the parking device, when the pressure in the main oil passage 40 is sufficient to meet the requirement, the direction-changing valve 30 can be switched to the second valve position 32, so that the oil outlet of the first hydraulic pump 10 is communicated with the pressure-releasing container 60, and the direct no-load unloading of the first hydraulic pump 10 is realized, thereby the hydraulic system simplifies the arrangement of hydraulic components, effectively reduces the complexity of control logic, reduces the weight of components, effectively reduces the development and procurement costs of components, and unloads the output oil of the first hydraulic pump 10 in an unloading manner, the hydraulic resistance of an unloading oil way is reduced as much as possible, the efficiency of the hydraulic system is improved, and meanwhile, the clutch is not arranged in the hydraulic system, so that the hardware arrangement space is saved, the system fault rate is reduced, and the hydraulic system has high popularization and application values.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (9)
1. A hydraulic system of an automatic transmission, characterized by comprising:
the first oil way is communicated with a main oil way of the clutch and the gear shifting and parking device and is used for providing hydraulic oil for the clutch and the gear shifting and parking device;
the second oil way is communicated with the cooling and lubricating oil ways of the clutch and the shaft tooth device and is used for providing cooling and lubricating oil for the clutch and the shaft tooth device;
a first oil pressure pump connected to the first oil passage;
a second oil pressure pump communicated with the second oil passage;
the reversing valve is arranged between the first oil pressure pump and the pressure relief container and is provided with a first valve position and a second valve position; and when the reversing valve is positioned at the first valve position, the first oil pressure pump supplies oil to the main oil way through the first oil way, and when the reversing valve is positioned at the second valve position, the first oil pressure pump is communicated with the pressure relief container.
2. The hydraulic system of an automatic transmission according to claim 1, wherein a common drive device is connected between the first hydraulic pump and the second hydraulic pump.
3. The hydraulic system of an automatic transmission according to claim 1, wherein an electromagnet is provided on the direction switching valve for controlling a switching valve position thereof.
4. The hydraulic system of an automatic transmission according to claim 1, wherein a check valve that allows only one-way flow of hydraulic oil from an oil outlet of the first hydraulic pump to the main oil passage is connected to the first oil passage, and when the selector valve is in the first valve position, the first hydraulic pump is communicated with the main oil passage through the check valve.
5. The hydraulic system of an automatic transmission according to claim 4, wherein an accumulator is directly connected to an oil outlet of the check valve and the main oil passage.
6. The hydraulic system of an automatic transmission according to claim 4, wherein a filter is provided on the first oil passage and at an oil inlet port of the check valve.
7. The hydraulic system of an automatic transmission according to any one of claims 1 to 6, wherein the oil inlets of the first oil hydraulic pump and the second oil hydraulic pump are each provided with a filter.
8. The hydraulic system of an automatic transmission according to any one of claims 1 to 6, wherein the first hydraulic pump and the second hydraulic pump are connected to a common pressure relief tank or both are connected to different pressure relief tanks.
9. The hydraulic system of an automatic transmission according to claim 2, wherein the drive device employs an electric motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911351390.6A CN113090750A (en) | 2019-12-23 | 2019-12-23 | Hydraulic system of automatic transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911351390.6A CN113090750A (en) | 2019-12-23 | 2019-12-23 | Hydraulic system of automatic transmission |
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| CN113090750A true CN113090750A (en) | 2021-07-09 |
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| CN201911351390.6A Pending CN113090750A (en) | 2019-12-23 | 2019-12-23 | Hydraulic system of automatic transmission |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115013370A (en) * | 2022-07-06 | 2022-09-06 | 兰州理工大学 | High-speed switch valve matrix digital gear shifting buffer system and control method |
-
2019
- 2019-12-23 CN CN201911351390.6A patent/CN113090750A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115013370A (en) * | 2022-07-06 | 2022-09-06 | 兰州理工大学 | High-speed switch valve matrix digital gear shifting buffer system and control method |
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