Valve element rotation type electro-hydraulic unit gear shifting device

Abstract

The invention relates to a gear shifting device, in particular to a valve element rotation type electro-hydraulic unit gear shifting device. The anti-vibration valve is composed of a motor, an anti-vibration pad, a sealing ring, a valve deck, a sealing pad, a valve element, an oil way bottom plate, a valve element stop pin and the like. The motor drives the valve element to rotate to switch gears at the specified speed and rotation angle, the light-load clutch and the heavy-load clutch can be combined in sequence, the gap between the valve element and the oil way bottom plate can be automatically compensated in the working process, the anti-pollution capacity is high, impact of clutch friction plates during gear shifting can be reduced, and the service life of the clutch is prolonged. And the service life and reliability of the clutch friction plate are improved. The oil reversing device can be used for a gear shifting mechanism of a gearbox and can also be used for other working occasions of oil reversing.

Description

Technical Field

[0001] This patent belongs to the field of gear shifting devices, and specifically relates to a valve core rotating electro-hydraulic unit gear shifting device. Background Art

[0002] In the mechanical structure of existing high-power automatic transmissions, the switching of a single gear usually requires the cooperation of two clutches. The shift device that controls the operation of the clutch drives the valve core to reciprocate by controlling the on-off of the low-pressure oil by the solenoid valve, and controls the high-pressure oil entering the clutch through the reciprocating motion of the valve core. In order to ensure smooth shifting and reduce the impact of shifting, the light-load clutch is generally combined first, and then the heavy-load clutch is combined. Therefore, the shift device requires a large number of pressure reduction, voltage stabilization, pressure increase, delay, error prevention, and throttle hole structures to meet the requirements of smooth shifting and clutch engagement timing. In response to the above requirements, the shift device with a reciprocating valve core design has a complex oil circuit inside the valve body and oil circuit bottom plate, a variety of structures, difficult processing, and poor tolerance to oil contamination. Therefore, it is not suitable for some special harsh working conditions.

[0003] In order to solve the above problems, patent CN 118008914 A proposes a valve core rotary flow distribution valve device, which converts the reciprocating motion of the valve core of the ordinary reversing valve into the rotary motion of the valve core, reducing the hydraulic impact during reversing. However, the valve core has a large number of oil channels, the oil channel processing is complex, the valve core rigidity is poor, it is not easy to ensure the accuracy, it is easy to deform and get stuck during operation, and it is easy to aggravate the wear of the valve core and the valve hole. After the device is worn, it cannot automatically compensate for the gap between the valve core and the valve hole, it is easy to leak, and the enlarged gap is easy to accumulate contaminants, resulting in gear shift delay or sticking, and it cannot meet the timing requirements of the gear shift clutch engagement. Summary of the invention

[0004] In order to solve the problems existing in the background technology, the purpose of the present invention is to provide a valve core rotating electro-hydraulic unit shifting device, which drives the valve core to rotate through a motor to switch the oil inlet on the top of the oil circuit bottom plate, thereby realizing the shifting function. Through the angle between the two oil outlets of the valve core and the two oil inlets of the oil circuit bottom plate, it is possible to achieve a timing of engagement in which the clutch at the end with a lighter clutch load engages first and the clutch at the end with a heavier clutch load engages later, which can reduce the impact of the clutch friction plate during shifting and extend the service life of the clutch friction plate. At the same time, there is no throttling hole inside, the valve core and the bottom plate oil receiving port aperture are relatively large, and the valve core has no radial contact with the valve cover, so the probability of contamination particles blocking the oil port is greatly reduced, thereby improving the anti-pollution ability of the electro-hydraulic unit shifting device.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A spool-rotating electro-hydraulic unit shift device, comprising a motor, a vibration damping pad, a sealing ring, a valve cover, a gasket, a spool, an oil circuit bottom plate, and a spool stop pin; the motor is installed on the valve cover by screws, and the vibration damping pad is installed between the motor and the valve cover to reduce the vibration of the motor during shifting and protect the motor; the spool is installed between the valve cover and the oil circuit bottom plate to isolate the high-pressure oil from the oil receiving port of the oil circuit bottom plate; the motor is connected to the spool to drive the spool to rotate, controlling the opening and closing of the oil receiving port of the oil circuit bottom plate to complete gear shifting; the gasket is installed between the valve cover and the oil circuit bottom plate to prevent oil leakage or seepage from the gap between the valve cover and the oil circuit bottom plate, and the sealing ring is installed on the spool to prevent oil leakage or seepage from the gap between the spool and the valve cover and the spool installation groove of the oil circuit bottom plate, and the spool stop pin is installed on the spool and moves with the spool.

[0007] As a further limitation of this patent, the spool is designed with an upper support shaft, a spool disc, and a lower support shaft. The upper support shaft, the spool disc, and the lower support shaft are an integral whole to ensure the overall stiffness and precision of the spool during production; there is a motor shaft installation groove on the end face of the upper support shaft for easy connection to the motor, and a sealing ring installation groove is provided radially to install the sealing ring to seal the gap between the upper support shaft and the valve cover to prevent oil leakage and seepage; on the outer side of the spool disc, there are a large spool oil outlet and a small spool oil outlet. The angle between the centerlines of the large and small spool oil outlets is 180 degrees. Among them, the large spool oil outlet is used to open and close the oil receiving port of the oil circuit bottom plate corresponding to the light load clutch, and the small oil outlet is used to open and close the oil receiving port of the oil circuit bottom plate corresponding to the heavy load clutch; there are two inclined oil holes at the transition between the upper support shaft and the spool disc. The angle between the inclined oil holes and the disc is 45 degrees to reduce the oil passage resistance, and the angle between the two inclined oil holes is 180 degrees to facilitate the delivery of high-pressure oil to the large and small spool oil outlets and improve the shifting speed; there is a main spool oil passage inside the lower support shaft to facilitate the delivery of high-pressure oil entering from the main oil port of the oil circuit bottom plate. There is a sealing ring installation groove radially to seal the gap between the lower support shaft and the spool installation groove of the oil circuit bottom plate to prevent the high-pressure oil from the oil receiving port of the oil circuit bottom plate from entering the gap between the spool and the oil circuit bottom plate, resulting in abnormal gear logic and damaging the gearbox; there is a stop pin installation groove on the lower surface of the spool disc for installing the spool stop pin. Its center is on the same center line as the large oil outlet of the disc, and the spool stop pin is installed in the groove to prevent the spool from rotating too much, resulting in incorrect logic of the shift device and causing the gearbox to shift gears, thereby damaging the gearbox.

[0008] As a further limitation of this patent, the height of the axial internal cavity of the valve cover is higher than that of the spool disc to store high-pressure oil and improve the shifting speed. The radial diameter of the valve cover is larger than that of the spool disc to reduce the radial contact between the spool disc and the valve cover and avoid jamming when the spool rotates.

[0009] As a further limitation of this patent, the motor is a stepper motor or a servo motor, which can drive the valve core to rotate at a specified angle and speed, so as to control the speed and time of high-pressure oil entering the oil passage, reduce the impact on the clutch friction plate during gear shifting, extend the service life of the clutch friction plate, and improve the reliability of the clutch friction plate.

[0010] As a further limitation of this patent, the oil passage bottom plate's oil receiving port leads to the clutch. Two oil receiving ports control one gear position. The oil receiving ports of the oil passage bottom plate's gear positions are composed of the oil receiving ports of gears 1, 2, 3, 4, reverse 1, and reverse 2. The oil receiving ports of each gear position lead to the corresponding clutch respectively. When it is necessary to switch gears, the two oil receiving ports of the oil passage bottom plate must be filled with high-pressure oil to push the clutch friction plates to engage.

[0011] As a further limitation of this patent, the material types of the gasket include, but are not limited to, asbestos and rubber-coated metal materials.

[0012] As a further limitation of this patent, the types of the sealing ring include, but are not limited to, sealing rings with sealing functions such as O-rings and rectangular rings.

[0013] This invention patent has the following advantages:

[0014] (1) Since the mating surface between the valve core and the oil passage bottom plate is the lower surface of the valve core disk, the oil pressure on the upper surface of the valve core disk presses the valve core, so that the lower surface of the valve core disk always fits the oil passage bottom plate during operation, realizing automatic compensation for the gap between the lower surface of the valve core disk and the oil passage bottom plate. Thus, it is not easy to accumulate pollution particles, and the oil outlet of the valve core and the oil receiving port of the oil passage bottom plate are relatively wide, so the anti-pollution ability is relatively strong.

[0015] (2) During the clutch engagement process, the motor rotates quickly first. The large and small oil outlets of the valve core connected to the motor quickly approach the oil receiving port of the bottom plate, and then rotate slowly, so that the high-pressure oil slowly enters the oil passage bottom plate from above the valve core, and then enters the corresponding clutch from the oil passage bottom plate, making the clutch engage slowly, thereby reducing the impact of the clutch during gear shifting, avoiding deformation of the clutch friction plate, and improving the reliability of the clutch friction plate.

[0016] (3) During the rotation of the valve core, since the angle between the large and small oil outlets of the valve core is 180 degrees, and the angle between the oil receiving ports of the oil passage bottom plate corresponding to the light-load clutch and the heavy-load clutch is less than 180 degrees. Therefore, the oil receiving port of the oil passage bottom plate corresponding to the light-load clutch approaches the large oil outlet of the valve core to intake oil first, and the oil receiving port of the oil passage bottom plate corresponding to the heavy-load clutch approaches the small oil outlet of the valve core to intake oil later, thus meeting the requirement of being light first and then heavy during the clutch engagement process, and improving the service life of the clutch friction plate at the light-load end.

[0017] (4) This electro-hydraulic unit shift device can replace the oil circuit bottom plate according to actual needs, match the requirements of the gearbox, achieve single or multiple gear shifts, with a high degree of modularization and strong structural compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic longitudinal sectional structure diagram of this invention patent.

[0019] Figure 2 It is a top view of this invention patent.

[0020] Figure 3 It is a schematic installation sectional view of the valve core of this invention patent.

[0021] Figure 4 It is a top view of the valve core of this invention patent.

[0022] Figure 5 It is a top view of the oil circuit bottom plate of this invention patent.

[0023] In the figure, there are motor 1, shock absorber pad 2, sealing ring 3, valve cover 4, gasket 5, valve core 6, oil circuit bottom plate 7, valve core stop pin 8, valve core disc 600, small oil outlet 601 of the valve core, sealing ring installation groove 602, motor shaft installation groove 603, upper support shaft 604, inclined oil hole 605 of the valve core, large oil outlet 606 of the valve core, lower support shaft 607, main oil passage 608 of the valve core, stop pin installation groove 609, valve core installation groove 700, main oil inlet 701 of the oil circuit bottom plate, valve core stop groove 702, 1st gear oil receiving port 703 of the oil circuit bottom plate, 2nd gear oil receiving port 704 of the oil circuit bottom plate, 3rd gear oil receiving port 705 of the oil circuit bottom plate, 4th gear oil receiving port 706 of the oil circuit bottom plate, reverse 1st gear oil receiving port 707 of the oil circuit bottom plate, reverse 2nd gear oil receiving port 708 of the oil circuit bottom plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to better understand the structure, features and advantages of the present invention, the following further describes this invention patent in detail with reference to the drawings and examples.

[0025] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to this patent; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0026] Such as Figure 1 、 Figure 2A spool-rotating electro-hydraulic unit shift device is shown, which includes a motor (1), a vibration damping pad (2), a sealing ring (3), a valve cover (4), a gasket (5), a spool (6), an oil circuit bottom plate (7), and a spool stop pin (8); the motor (1) is installed on the valve cover (4) by screws, and the vibration damping pad (2) is installed between the motor (1) and the valve cover (4) to reduce the vibration of the motor (1) during shifting and protect the motor (1); the spool (6) is installed between the valve cover (4) and the oil circuit bottom plate (7) to isolate the high-pressure oil from the oil inlet of the oil circuit bottom plate (7); the motor (1) is connected to the spool (6) to drive the spool (6) to rotate, control the opening and closing of the oil inlet of the oil circuit bottom plate (7), and complete the gear shift; the gasket (5) is installed between the valve cover (4) and the oil circuit bottom plate (7) to prevent oil leakage or seepage from the gap between the valve cover (4) and the oil circuit bottom plate (7), the sealing ring is installed on the spool (6) to prevent oil leakage or seepage from the gap between the spool (6) and the valve cover (4) and the spool installation groove (700), and the spool stop pin (8) is installed on the spool (6) and moves with the spool (6).

[0027] The spool (6) is designed with an upper support shaft (604), a spool disc (600), and a lower support shaft (607). The upper support shaft (604), the spool disc (600), and the lower support shaft (607) are an integral whole, so as to ensure the overall stiffness and accuracy of the spool (6) during production. There is a motor shaft mounting groove (603) on the end face of the upper support shaft (604) for facilitating the connection of the motor (1), and a seal ring mounting groove (602) is provided radially to install a seal ring (3) to seal the gap between the upper support shaft (604) and the valve cover (4) to prevent oil leakage and seepage. On the outside of the disc, there are a large spool oil outlet (606) and a small oil outlet (601). The angle between the centerlines of the large and small oil outlets is 180 degrees. Among them, the large spool oil outlet (606) is used to switch the oil receiving port of the oil circuit bottom plate corresponding to the light load clutch, and the small spool oil outlet (601) is used to switch the oil receiving port of the oil circuit bottom plate corresponding to the heavy load clutch. There are two spool inclined oil holes (605) at the transition between the upper support shaft (604) and the disc. The angle between the spool inclined oil hole (605) and the spool disc (600) is 45 degrees to reduce the oil passage resistance, and the angle between the two spool inclined oil holes (605) is 180 degrees to facilitate the delivery of high-pressure oil to the large and small spool oil outlets and improve the reaction speed of the shifting device. There is a spool main oil passage (608) inside the lower support shaft (607) to facilitate the delivery of high-pressure oil entering from the main oil port of the oil circuit bottom plate. A seal ring mounting groove (602) is provided radially to seal the gap between the lower support shaft (607) and the spool mounting groove (700) to prevent the high-pressure oil at the oil receiving port of the oil circuit bottom plate from entering the gap between the spool (6) and the oil circuit bottom plate (7), resulting in abnormal gear position logic and damaging the gearbox. There is a stop pin mounting groove (609) on the lower surface of the spool disc (600) for installing a spool stop pin (8). Its center is on the same center line as the large spool oil outlet (606) to prevent the spool (6) from rotating too much, resulting in incorrect logic of the shifting device and causing the gearbox to shift gears, thus damaging the gearbox.

[0028] The axial internal cavity height of the valve cover (4) is higher than that of the spool disc (600) for storing high-pressure oil to improve the shifting speed. The radial diameter of the valve cover (4) is larger than the diameter of the spool disc (600) to reduce the radial contact between the spool disc (600) and the valve cover (4) and avoid jamming when the spool (6) rotates.

[0029] The motor (1) is a stepper motor or a servo motor, which can drive the spool (6) to rotate at a specified angle and speed, so as to be able to control the speed and time of high-pressure oil entering the oil passage, reduce the impact of the clutch friction plate during shifting, and achieve smooth shifting.

[0030] The oil receiving port of the oil circuit bottom plate (7) leads to the clutch. The center of the oil circuit bottom plate (7) is provided with a valve core installation groove (700) and a main oil inlet of the bottom plate (701). The oil circuit bottom plate (7) is also provided with a valve core stop groove (702) and a plurality of gear oil receiving ports. The valve core installation groove (700) is used to install the valve core lower support shaft (607). The main oil inlet of the bottom plate (701) is used to deliver high-pressure oil to the valve core (6). The valve core stop groove (702) and the valve core stop pin (8) are designed for safety redundancy and are used to prevent the valve core (6) from rotating at an excessive angle, causing the gear logic to be confused and damaging the gearbox. The gear oil receiving port of the oil circuit bottom plate (7) consists of 1, 2, 3, 4, reverse 1, and reverse 2 gear oil receiving ports (703, 704, 705, 706, 707, 708), and the oil receiving ports of each gear lead to the corresponding clutch respectively.

[0031] The specific working mode is as follows:

[0032] When the shifting device is not working and in neutral gear, high-pressure oil is transported from the main oil inlet (701) of the bottom plate through the main oil passage (608) of the valve core to the inclined oil hole (605) of the valve core. When the large oil outlet (606) and the small oil outlet (601) of the valve core are in the neutral position, the neutral position is between the reverse first gear oil receiving port (708) and the first gear oil receiving port (703). The upper surface of the valve core disc (600) and the valve cover (4) are filled with high-pressure oil. When the large and small oil outlets (606, 601) of the valve core rotate from the neutral position to the first gear oil receiving port (703) of the oil path bottom plate, the large oil outlet (606) of the valve core first approaches the first gear oil receiving port (703), and the high-pressure oil between the upper surface of the valve core disc (600) and the valve cover (4) enters the first gear oil receiving port (703) of the oil path bottom plate from the large oil outlet (606) of the valve core, and the corresponding light-duty clutch engages. Subsequently, the small oil outlet (601) of the valve core approaches the first gear oil receiving port (703) of the oil path bottom plate again, and the high-pressure oil between the upper surface of the valve core disc (600) and the valve cover (4) enters the first gear oil receiving port (703) of the oil path bottom plate from the small oil outlet (601) of the valve core, and the corresponding heavy-duty clutch engages. Thus, the electro-hydraulic unit shifting device completes the shift from neutral to first gear. When the electro-hydraulic unit shifts back from first gear to neutral, the oil port corresponding to the small oil outlet (601) of the valve core closes first, and the corresponding heavy-duty clutch disengages first. Subsequently, the oil port corresponding to the large oil outlet (606) of the valve core closes later, and the corresponding light-duty clutch disengages later. During the shifting process, the motor (1) can first rotate quickly to approach the oil receiving port to increase the shifting speed, and then rotate slowly to open the oil receiving port, gradually increasing the oil pressure and the speed of oil entry to reduce the impact of the clutch friction plate engagement, prevent the deformation of the clutch friction plate, and improve the service life and reliability of the clutch friction plate. As the electro-hydraulic unit shifting device rotates with the motor driving the valve core (6), it cyclically switches between the above two working modes to shift gears, controlling the gearbox to shift from first gear to fourth gear, from fourth gear to neutral, from neutral to reverse second gear, and from reverse second gear to neutral, realizing periodic state switching. During the periodic shifting process, since the upper surface of the valve core disc (600) is always filled with high-pressure oil, the lower surface of the valve core disc (600) is tightly pressed against the oil path bottom plate (7), thereby automatically compensating for the gap between the lower surface of the valve core disc (600) and the oil path bottom plate (7).

Claims

1. A valve core rotating electro-hydraulic unit shifting device, characterized in that: The invention comprises a motor (1), a vibration damping pad (2), a sealing ring (3), a valve cover (4), a sealing ring (5), a valve core (6), an oil circuit bottom plate (7), and a valve core stop pin (8); the motor (1) is mounted on the valve cover (4) by means of screws, the vibration damping pad (2) is mounted between the motor (1) and the valve cover (4), the valve core (6) is mounted between the valve cover (4) and the oil circuit bottom plate (7), the motor (1) is connected to the valve core (6) to drive the valve core (6) to rotate, the sealing ring (5) is mounted between the valve cover (4) and the oil circuit bottom plate (7), the sealing ring (3) is mounted on the valve core (6), and the valve core stop pin (8) is mounted on the valve core (6).

2. According to claim 1, a valve core rotary type electro-hydraulic unit shifting device is characterized in that: The valve core (6) is provided with an upper support shaft (604), a valve core disc (600), and a lower support shaft (607); the upper support shaft (604), the valve core disc (600), and the lower support shaft (607) are integrated into one body; the end surface of the upper support shaft (604) is provided with a motor shaft mounting groove (603), and a sealing ring mounting groove (602) is provided in the radial direction; a large valve core oil outlet (606) and a small valve core oil outlet (601) are provided on the outer side of the valve core disc (600); the angle between the bisector of the large valve core oil outlet (606) and the small valve core oil outlet (601) and the center line of the mounting groove (603) is 180 degrees; two valve core oblique oil holes (605) are provided at the transition between the upper support shaft (604) and the valve core disc (600), the angle between the valve core oblique oil hole (605) and the valve core disc (600) is 45 degrees, and the angle between the two valve core oblique oil holes (605) is 180 degrees; a valve core main oil channel (608) is provided in the lower support shaft (607), and a sealing ring installation groove (602) is provided radially; a stop pin installation groove (609) is provided on the lower surface of the valve core disc (600), the center of which is on the same center line as the valve core large oil inlet (606), and a valve core stop pin (8) is installed in the groove.

3. According to claim 1, a valve core rotary type electro-hydraulic unit shifting device is characterized in that: The height of the axial inner cavity of the valve cover (4) is higher than that of the valve core disc (600), and the radial diameter of the valve cover (4) is greater than the diameter of the valve core disc (600).

4. The valve core rotating electro-hydraulic unit shifting device according to claim 1, characterized in that: The motor (1) is a stepper or servo motor, which can drive the valve core to rotate at a specified angle and speed.

5. The valve core rotating electro-hydraulic unit shifting device according to claim 1, characterized in that: The oil receiving port of the oil circuit bottom plate (7) leads to the clutch, and two oil receiving ports control one gear position.

6. The valve core rotating electro-hydraulic unit shifting device according to claim 1, characterized in that: The material types of the sealing gasket (5) include but are not limited to asbestos and rubber-coated metal materials.

7. The valve core rotating electro-hydraulic unit shifting device according to claim 1, characterized in that: The types of the sealing ring (3) include but are not limited to O-rings and rectangular rings.

8. The valve core rotating electro-hydraulic unit shifting device according to claim 2, characterized in that: The types of the motor shaft mounting groove (603) on the end surface of the upper support shaft (604) include, but are not limited to, round head keyway and spline.

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