A clutch oil pressure control system for a transmission

Abstract

The present invention discloses a clutch oil pressure control system for a transmission, comprising a priority valve, a shift solenoid valve A, a shift solenoid valve B, a shift solenoid valve C, and a control assembly. One end of the priority valve is connected to a main oil pressure regulating valve, and the other end of the priority valve is connected to the control assembly. The shift solenoid valves A, B, and C are connected in parallel, and one end of each of the shift solenoid valves A, B, and C is connected to the main oil pressure regulating valve. The present invention ensures that only one clutch cylinder receives oil in the intersecting oil passages between the reversing spools A, B, and C, while the remaining clutch cylinders drain oil. Even if two or more valve cores become stuck, the transmission will not stop operating. By configuring the lock solenoid valve and the associated oil circuits, the original gear position can be maintained during a power outage, achieving a gear lock function. The shift position can also be returned to neutral during a power outage, achieving a neutral lock function.

Description

Technical Field

[0001] The present invention belongs to the technical field of clutch oil pressure control, and in particular relates to a clutch oil pressure control system for a transmission. Background Art

[0002] The hydraulic control system for multi-plate wet clutches in hydraulic transmissions is a key technology for shift control, crucial to the transmission's shift quality and service life. Currently, clutch pressure control systems for various automotive hydraulic transmissions typically utilize a combination of standard valves, including a directional control valve, a relief valve, and a pressure reducing valve. External oil pipes are then connected to the clutch cylinder to provide oil pressure, thereby controlling the clutch engagement and release process. However, this type of control system is complex, requires numerous external components, occupies a large space, and is difficult to implement automatically.

[0003] Patent application number 2019113481229 discloses a clutch oil pressure control system for a transmission. This invention utilizes multiple solenoid valves, a reversing spool valve, a buffer valve, and a buffer pressure-regulating valve to control the clutch oil pressure, resulting in a gear lock function. Shift protection is provided by switching multiple solenoid valves on and off. The pressure-regulating solenoid valves can be controlled based on operating conditions, and the buffer pressure-regulating valves can be used to adjust the buffering. This system minimizes interference factors, minimizes power interruption time during shifts, and achieves excellent shift quality. However, it lacks a neutral lock function, nor does it utilize a throttle structure to adjust the direction and sequence of oil pressure entry. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a clutch oil pressure control system for a transmission, which can solve the problem that the existing technology is difficult to achieve automatic control.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a clutch oil pressure control system for a transmission, comprising a priority valve, a shift solenoid valve A, a shift solenoid valve B, a shift solenoid valve C, and a control component, wherein one end of the priority valve is connected to a main oil pressure regulating valve, and the other end of the priority valve is connected to the control component, the shift solenoid valve A, the shift solenoid valve B, and the shift solenoid valve C are connected in parallel, and one end of the shift solenoid valve A, the shift solenoid valve B, and the shift solenoid valve C is connected to the main oil pressure regulating valve.

[0007] Preferably, the control component includes a reversing slide valve A, a reversing slide valve B, a reversing slide valve C, a buffer valve A, a buffer valve B, and a buffer valve C. One end of the reversing slide valve C is connected to the shift solenoid valve A, and the other end of the reversing slide valve C is connected to the buffer valve C. One end of the reversing slide valve B is connected to the shift solenoid valve B, and the other end of the reversing slide valve B is connected to the buffer valve B. One end of the reversing slide valve A is connected to the shift solenoid valve C, and the other end of the reversing slide valve A is connected to the buffer valve A.

[0008] Preferably, a clutch cylinder A is provided on the oil passage between the reversing slide valve C and the reversing slide valve B, a clutch cylinder B is provided on the oil passage between the reversing slide valve B and the reversing slide valve A, and the reversing slide valve A is connected to the clutch cylinder C through the oil passage.

[0009] Preferably, a throttle hole A is provided on the oil passage connecting the priority valve and the main oil pressure regulating valve, and a throttle hole B is provided on the oil passage connecting the priority valve and the shift solenoid valve A, the shift solenoid valve B, and the shift solenoid valve C respectively, and the diameter of the throttle hole A is smaller than the diameter of the throttle hole B.

[0010] Preferably, the reversing slide valve A, the reversing slide valve B, and the reversing slide valve C are respectively connected to the back pressure valve.

[0011] Preferably, the reversing slide valve A, the reversing slide valve B, and the reversing slide valve C are respectively connected to a retaining oil pressure component A.

[0012] Preferably, the reversing slide valve A, the reversing slide valve B, and the reversing slide valve C are connected to an oil pan A respectively.

[0013] Preferably, the buffer valve A, buffer valve B, and buffer valve C are respectively connected to an oil pan B.

[0014] Preferably, a filter is provided on the oil circuit between the shift solenoid valve A, the shift solenoid valve B, the shift solenoid valve C and the main oil pressure regulating valve.

[0015] Preferably, a locking solenoid valve is provided on the control component.

[0016] The beneficial effects of the present invention are:

[0017] 1. This invention ensures that only one clutch cylinder receives oil in the intersecting oil passages between reversing valves A, B, and C, while the remaining clutch cylinders drain oil. This prevents the transmission from stalling even if two or more valve cores become stuck. The design of the shift lock solenoid valve and associated oil circuits maintains the original gear position during a power outage, achieving a shift lock function. It also enables a return to neutral during a power outage, achieving a neutral lock function. It also controls the oil flow to and from all three clutches.

[0018] 2. The present invention utilizes multiple shift solenoid valves, a reversing spool valve, and a buffer valve to control clutch oil pressure. This system features gear lock and neutral lock functions, allowing it to maintain the original gear position even in the event of a sudden power outage. This oil pressure control system utilizes multiple shift solenoid valves to provide shift protection, resulting in reliable shifting and minimizing power interruption time during shifts, thereby ensuring superior shift quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the oil circuit when the gear lock function of the present invention is not working;

[0020] Figure 2 This is a schematic diagram of the oil circuit when the neutral lock function of the present invention is not working;

[0021] Figure 3 It is a structural diagram of the priority valve and the reversing slide valve of the present invention;

[0022] In the figure: 1-priority valve, 2-filter, 3-shift solenoid valve A, 4-shift solenoid valve B, 5-shift solenoid valve C, 6-reversing slide valve A, 7-reversing slide valve B, 8-reversing slide valve C, 9-cushion valve A, 10-cushion valve B, 11-cushion valve C, 12-back pressure valve, 13-locking solenoid valve, 14-main oil pressure regulating valve, 15-clutch cylinder A, 16-clutch cylinder B , 17-clutch cylinder C, 18-throttle hole A, 19-throttle hole B, 20-holding oil pressure assembly A, 21-oil pan A, 22-oil pan B, 23-oil pan C, 24-holding oil pressure assembly B, 25-oil channel A, 26-oil channel B, 27-oil channel C, 28-oil channel D, 29-oil channel E, 30-oil channel F, 31-oil channel G, 32-oil channel H, 33-elastic part. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0024] Example 1:

[0025] like Figures 1 to 2 As shown, a clutch oil pressure control system for a transmission includes a priority valve 1, a shift solenoid valve A3, a shift solenoid valve B4, a shift solenoid valve C5, and a control component. One end of the priority valve 1 is connected to the main oil pressure regulating valve 14 (P), and the other end of the priority valve 1 is connected to the control component. The shift solenoid valve A3, the shift solenoid valve B4, and the shift solenoid valve C5 are connected in parallel, and one end of the shift solenoid valve A3, the shift solenoid valve B4, and the shift solenoid valve C5 is connected to the main oil pressure regulating valve 14.

[0026] The control assembly includes a reversing spool valve A6, a reversing spool valve B7, a reversing spool valve C8, a buffer valve A9, a buffer valve B10, and a buffer valve C11. One end of the reversing spool valve C8 is connected to the shift solenoid valve A3, and the other end is connected to the buffer valve C11. One end of the reversing spool valve B7 is connected to the shift solenoid valve B4, and the other end is connected to the buffer valve B10. One end of the reversing spool valve A6 is connected to the shift solenoid valve C5, and the other end is connected to the buffer valve A9. Reversing spool valves A6, B7, and C8 are connected in series. Reversing spool valve C8 is controlled by the shift solenoid valve A3, reversing spool valve B7 is controlled by the shift solenoid valve B4, and reversing spool valve A6 is controlled by the shift solenoid valve C5. Buffer valve A9, buffer valve B10 and buffer valve C11 respectively work in the middle of the gear shifting process, and when shifting, the oil pressure in the corresponding clutch cylinder A15, clutch cylinder B16 and clutch cylinder C17 respectively increases slowly until the corresponding clutch cylinder is filled with oil and the oil pressure is the same as the main oil pressure.

[0027] A clutch cylinder A15 is installed in the oil passage between the reversing valves C8 and B7. A clutch cylinder B16 is installed in the oil passage between the reversing valves B7 and A6. Reversing valve A6 is connected to a clutch cylinder C17 via an oil passage. Clutch cylinder A15 is a high-range cylinder, clutch cylinder B16 is a mid-range cylinder, and clutch cylinder C17 is a low-range cylinder. Clutch cylinders A15, B16, and C17 are each connected to an oil pan C23.

[0028] A throttle hole A18 is provided on the oil passage connecting the priority valve 1 and the main oil pressure regulating valve 14. A throttle hole B19 is provided on the oil passage connecting the priority valve 1 and the shift solenoid valve A3, the shift solenoid valve B4, and the shift solenoid valve C5, respectively. That is, there are three throttle holes B19. The diameter of the throttle hole A18 is smaller than that of the throttle hole B19. This arrangement allows the oil pressure to enter the reversing slide valve (reversing slide valve A6, reversing slide valve B7, or reversing slide valve C8) first. The upper end of the clutch spool (spool A6, B7, or C8) is pressed to the bottom, compressing elastic member 33 and ensuring that (clutch cylinder A15, B16, or C17) is in the clutch oil drain state, preventing torque output failure in neutral. Conversely, the retaining hydraulic assembly A20 directs the spool (spool A6, B7, or C8) upward, extending elastic member 33. When priority valve 1 opens upward, spool A6 in the lower position directs the main oil pressure regulating valve 14 into clutch cylinder A15, and the adjacent spools B7 and C8 in series drain oil. When spool B7 or C8 directs oil into clutch cylinder B16 or C17, the other two spools also drain oil accordingly.

[0029] The reversing spool valves A6, B7, and C8 are each connected to a back-pressure valve 12. Each of these valves can drain oil through the back-pressure valve 12. Oil unloading from the clutch cylinders also occurs through the back-pressure valve 12, ensuring that the oil passages from the reversing spool valves A6, B7, and C8 to the corresponding clutch cylinders maintain very low-pressure oil and an air-free state, ensuring fast shifting response.

[0030] The reversing spool valves A6, B7, and C8 are each connected to a holding-position hydraulic assembly A20. Specifically, three holding-position hydraulic assemblies A20 are provided, each containing a controlled solenoid valve and associated connecting oil circuits. When the reversing spool cylinders are filled with oil (reversing spool valve A6 fills the shift solenoid valve C5, reversing spool valve B7 fills the shift solenoid valve B4, and reversing spool valve C8 fills the shift solenoid valve A3), the holding-position hydraulic assembly A20 fills the bottom end of the core of the corresponding reversing spool valve A6, B7, or C8 connected to the holding-position hydraulic assembly A20. This arrangement allows the holding-position hydraulic assembly A20 to maintain the original gear position without shifting gears when power is removed from the shift solenoid valve C5 connected to reversing spool valve A6, the shift solenoid valve B4 connected to reversing spool valve B7, or the shift solenoid valve A3 connected to reversing spool valve C8.

[0031] The reversing slide valve A6, the reversing slide valve B7, and the reversing slide valve C8 are respectively connected to the oil pan A21. This arrangement allows the reversing slide valve A6, the reversing slide valve B7, and the reversing slide valve C8 to drain oil into the oil pan A21 for storage, and then return the oil when the reversing slide valve needs to be filled with oil.

[0032] The buffer valve A9, buffer valve B10, and buffer valve C11 are respectively connected to the oil pan B22. This arrangement allows the buffer valve A9, buffer valve B10, and flush valve C11 to drain oil to the connected oil pan B22 for storage, and then return the oil when the buffer valve needs to be filled with oil.

[0033] A filter 2 is provided in the oil path between the shift solenoid valves A3 , B4 , C5 and the main oil pressure regulating valve 14 to prevent particulate matter from entering.

[0034] The control assembly is provided with a locking solenoid valve 13. The locking solenoid valve 13 is connected to the reversing slide valve A6. The locking solenoid valve 13 is energized when the clutch is in neutral gear to control the oil leakage of the reversing slide valve A6 holding oil pressure.

[0035] Priority valve 1 is connected to main oil pressure regulating valve 14 via oil passage A25. Priority valve 1 is connected to holding position hydraulic assembly B24 via oil passage B26. Holding position hydraulic assembly B24 includes a controlled solenoid valve and associated connecting oil circuits. Reversing spool valve A6 is connected to shift solenoid valve A3 via oil passage C27. Reversing spool valve A6 is connected to oil pan A21 via oil passage D28. Reversing spool valve A6 is connected to reversing spool valve B7 via oil passage E29. Reversing spool valve A6 is connected to clutch cylinder A15 via oil passage F30. Reversing spool valve A6 is connected to backpressure valve 12 via oil passage G31. Reversing spool valve A6 is connected to holding position hydraulic assembly A20 via oil passage H. The piping connections between reversing spool valves B7 and C8 and their corresponding shift solenoid valves, reversing spool valves, clutch cylinders, backpressure valves, oil pan A, and holding position hydraulic assembly A are identical to those for reversing spool valve A6.

[0036] In Example 1, the intersecting oil passages between reversing spool valves A6, B7, and C8 ensure that only one clutch cylinder receives oil, while the remaining clutch cylinders drain oil. This prevents the transmission from stalling even if the spools of two or more reversing spool valves become stuck. The configuration of the shift lock solenoid valve 13 and the associated oil circuits maintains the original gear position during power outages, achieving a shift lock function. The configuration of Example 1 allows for control of oil flow to and from three clutches.

[0037] Example 2:

[0038] like Figures 2 to 3 As shown. Example 2 is a modification of Example 1. Figure 1 The shift lock solenoid valve 13 is omitted, and the remaining components, structure, and principles remain the same. The relevant oil circuits in this embodiment enable return to neutral when power is lost, implementing a neutral lock function. The configuration of Example 2 can control the oil flow in and out of three clutches (clutch cylinder A15, clutch cylinder B16, and clutch cylinder C17).

Claims

1. A clutch oil pressure control system for a transmission, characterized in that: The invention comprises a priority valve (1), a shift solenoid valve A (3), a shift solenoid valve B (4), a shift solenoid valve C (5), and a control component. One end of the priority valve (1) is connected to a main oil pressure regulating valve (14), and the other end of the priority valve (1) is connected to the control component. The shift solenoid valve A (3), the shift solenoid valve B (4), and the shift solenoid valve C (5) are connected in parallel. One end of the shift solenoid valve A (3), the shift solenoid valve B (4), and the shift solenoid valve C (5) is connected to the main oil pressure regulating valve (14). The control assembly includes a reversing slide valve A (6), a reversing slide valve B (7), a reversing slide valve C (8), a buffer valve A (9), a buffer valve B (10), and a buffer valve C (11). One end of the reversing slide valve C (8) is connected to the shift solenoid valve A (3), and the other end of the reversing slide valve C (8) is connected to the buffer valve C (11). One end of the reversing slide valve B (7) is connected to the shift solenoid valve B (4), and the other end of the reversing slide valve B (7) is connected to the buffer valve B (10). One end of the reversing slide valve A (6) is connected to the shift solenoid valve C (5), and the other end of the reversing slide valve A (6) is connected to the buffer valve A (9). A throttle hole A (18) is provided on the oil passage connecting the priority valve (1) and the main oil pressure regulating valve (14), and a throttle hole B (19) is provided on the oil passage connecting the priority valve (1) and the shift solenoid valve A (3), the shift solenoid valve B (4), and the shift solenoid valve C (5), respectively. The diameter of the throttle hole A (18) is smaller than the diameter of the throttle hole B (19); The reversing slide valve A (6), the reversing slide valve B (7), and the reversing slide valve C (8) are respectively connected to a retaining oil pressure assembly A (20).

2. A clutch oil pressure control system for a transmission according to claim 1, characterized in that: A clutch oil cylinder A (15) is provided on the oil passage between the reversing slide valve C (8) and the reversing slide valve B (7), a clutch oil cylinder B (16) is provided on the oil passage between the reversing slide valve B (7) and the reversing slide valve A (6), and the reversing slide valve A (6) is connected to the clutch oil cylinder C (17) through the oil passage.

3. The clutch oil pressure control system for a transmission according to claim 1, characterized in that: The reversing slide valve A (6), the reversing slide valve B (7), and the reversing slide valve C (8) are respectively connected to the back pressure valve (12).

4. The clutch oil pressure control system for a transmission according to claim 1, characterized in that: The reversing slide valve A (6), the reversing slide valve B (7), and the reversing slide valve C (8) are respectively connected to an oil pan A (21).

5. The clutch oil pressure control system for a transmission according to claim 1, characterized in that: The buffer valve A (9), buffer valve B (10), and buffer valve C (11) are respectively connected to an oil pan B (22).

6. The clutch oil pressure control system for a transmission according to claim 1, characterized in that: A filter (2) is provided on the oil circuit between the shift solenoid valve A (3), the shift solenoid valve B (4), the shift solenoid valve C (5) and the main oil pressure regulating valve (14).

7. The clutch oil pressure control system for a transmission according to claim 1, characterized in that: The control component is provided with a locking electromagnetic valve (13).

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