CN221120879U - Mechanical pressure-adjustable gear shifting valve - Google Patents

Abstract

The utility model discloses a mechanical pressure-adjustable gear shifting valve, which comprises a main pressure control valve assembly, a gear shifting valve assembly and a pressure regulating valve assembly, wherein the main pressure control valve assembly comprises a first inner cavity and a second inner cavity which are mutually communicated, a small piston is arranged in the first inner cavity, a large piston is arranged in the second inner cavity, the small piston is connected with the large piston through a first elastic piece, a main pressure control valve body is provided with a first oil port which supplies oil to the first inner cavity, the first inner cavity supplies oil to a clutch through the gear shifting valve assembly, the gear shifting valve assembly supplies oil to the pressure regulating valve assembly, and the second inner cavity of the pressure regulating valve assembly is communicated. According to the scheme, the pressure adjusting valve assembly is adjusted, so that the pressure given by the pressure adjusting valve assembly to the large piston is changed, the pressure adjustment of the mechanical gear shifting valve is further realized, and the pressure adjusting range of the mechanical gear shifting valve is increased.

Description

Mechanical pressure-adjustable gear shifting valve

Technical Field

The utility model relates to the field of hydraulic transmission, in particular to a mechanical pressure-adjustable gear shifting valve.

Background

The existing pressure-adjustable mechanical gear shifting valve is basically formed by combining a reversing mechanism and a decompression mechanism, the pressure adjusting range of the existing pressure-adjustable mechanical gear shifting valve is limited to a part of range of gear pressure, and the universality is poor.

Disclosure of utility model

In order to solve the problem of poor universality in the prior art, the utility model aims to provide the mechanical pressure-adjustable gear shifting valve, so that the gear shifting valve has a larger adjusting range and better universality.

In order to achieve the above purpose, the present utility model adopts the following technical scheme: the mechanical pressure-adjustable gear shifting valve comprises a main pressure control valve assembly and a gear shifting valve assembly, and further comprises a pressure regulating valve assembly, wherein the gear shifting valve assembly is arranged at the upper part of the main pressure control valve assembly, and the pressure regulating valve assembly is arranged on the side surface of the main pressure control valve assembly; the main pressure control valve assembly comprises a main pressure control valve body, a first inner cavity and a second inner cavity which are mutually communicated are arranged in the main pressure control valve body, the inner diameter of the first inner cavity is smaller than that of the second inner cavity, a small piston is arranged in the first inner cavity, a large piston is arranged in the second inner cavity, the small piston and the large piston are connected through a first elastic element, a first oil port, a sixth oil port and a seventh oil port are arranged on the main pressure control valve body, wherein the first oil port is an oil inlet, the sixth oil port and the seventh oil port are oil drain ports, and the first oil port and the seventh oil port are both communicated with the first inner cavity; the gear shifting valve assembly comprises a gear shifting valve body and a reversing valve core, a third oil port and a fourth oil port are arranged on the gear shifting valve body, the third oil port is communicated with the I gear clutch, the fourth oil port is communicated with the II gear clutch, the reversing valve core is rotatably arranged on the gear shifting valve body, and a second oil port and a fifth oil port are arranged on the reversing valve core; the first inner cavity can be communicated with the third oil port or the fourth oil port through the second oil port connection; the pressure regulating valve assembly comprises a pressure regulating valve body, a first pressure regulating valve core and a second pressure regulating valve core, a first oil cavity and a second oil cavity which are mutually communicated through a through hole are arranged in the pressure regulating valve body, the first oil cavity is communicated with the second inner cavity, the first pressure regulating valve core is installed in the second oil cavity in a lifting mode, the second pressure regulating valve core is connected with the first pressure regulating valve core through a second elastic piece, and the second pressure regulating valve core is spliced with the through hole; the second oil cavity is communicated with the sixth oil port; the second oil port is communicated with the first oil cavity; the shuttle valve comprises a first interface, a second interface and a third interface, the first interface is connected with an outlet of the one-way valve, the second interface is connected with a third oil port, the third interface is connected with a fourth oil port, and the one-way valve is communicated with the first oil cavity.

Preferably, the gear shifting valve body is provided with an opening, the third oil port and the fourth oil port are both communicated with the opening of the gear shifting valve body, one end of the reversing valve core is inserted into the opening of the gear shifting valve body and is rotationally connected with the gear shifting valve body, the second oil port is arranged on the reversing valve core and is positioned in the opening of the gear shifting valve body, the fifth oil port is a notch arranged on the outer surface of the reversing valve core, and the fifth oil port is communicated with the third oil port and/or the fourth oil port.

Preferably, a reversing handle is mounted at the other end of one end of the reversing valve core.

Preferably, the second oil port is communicated with the first oil cavity through a throttle valve.

Preferably, the second pressure regulating valve core is a conical valve.

Preferably, the second oil cavity is arranged at an upward opening on the pressure regulating valve body, one end of the first pressure regulating valve core is inserted into the second oil cavity from top to bottom, a spiral groove is formed in the outer peripheral surface of the first pressure regulating valve core, a protruding limiting piece on the inner wall of the second oil cavity is inserted into the spiral groove, and the limiting piece is attached to the inner wall of the spiral groove.

Preferably, the limiting piece comprises a first steel ball and a first limiting spring, the pressure regulating valve body is provided with a limiting groove communicated with the second oil cavity, the first limiting spring is arranged in the limiting groove, two ends of the first limiting spring are respectively propped against the inner wall of the limiting groove and the first steel ball, and the first limiting spring is used for pushing the first steel ball, so that part of the first steel ball extends out of the limiting groove and is attached to the inner wall of the spiral groove of the first pressure regulating valve core.

Preferably, a pressure regulating handle is mounted at one end of the first pressure regulating valve core.

Preferably, the second elastic piece comprises a positioning rod and a fourth spring, the bottom end of the first pressure regulating valve core is provided with a positioning hole, the upper part of the positioning rod is inserted into the positioning hole, the positioning rod is in sliding connection with the positioning hole, the second pressure regulating valve core is fixed at the bottom of the positioning rod, the fourth spring is sleeved on the positioning rod, and two ends of the fourth spring are respectively connected with the first pressure regulating valve core and the second pressure regulating valve core.

Preferably, the first elastic piece comprises a first spring, a second spring and a third spring, the lengths of the first spring, the second spring and the third spring are sequentially reduced, the second spring is sleeved on the first spring, the third spring is sleeved on the second spring, and two ends of the third spring are respectively connected with the large piston and the small piston.

The technical scheme of the utility model has the beneficial effects that: the pressure of the mechanical gear shifting valve is not limited to the piston and the spring, the oil pressure in the main pressure oil cavity can be further controlled through the pressure regulating valve assembly, the pressure regulating range of the mechanical gear shifting valve is further increased, the mechanical gear shifting valve has better universality and adaptability, the pressure in the clutch can be continuously regulated, and the mechanical gear shifting valve is particularly suitable for ships, engineering and other power transmission devices with wet-type hydraulic friction clutches.

Drawings

FIG. 1 is a schematic view of a hydraulic control architecture diagram;

FIG. 2 is a schematic diagram of a mechanical pressure-adjustable shift valve;

FIG. 3 is a sectional view taken along the direction D-D in FIG. 2;

FIG. 4 is a view in the E direction of FIG. 2;

FIG. 5 is a cross-sectional view taken along the direction C-C in FIG. 4

Fig. 6 is a schematic view of the mounting structure of the check valve.

Reference numerals: 1. a main pressure control valve assembly; 2. a shift valve assembly; 3. a pressure regulating valve assembly; 4. a throttle valve; 5. a one-way valve; 6. a shuttle valve; 7. a baffle ring; 8. a fourth seal ring; 9. a positioning ring; 10. a small piston; 11. a first spring; 12. a second spring; 13. a third spring; 14. a large piston; 15. a first gasket; 16. a partition plate; 17. a regulating valve body; 18. a second pressure regulating valve core; 19. a fourth spring; 20. a first steel ball; 21. a first limit spring; 22. a first pressure regulating valve core; 23. a fifth seal ring; 24. a pressure regulating handle; 25. a reversing handle; 26. a mounting bracket; 27. a second seal ring; 28. a reversing valve core; 29. a shift valve body; 30. a stuffiness plug; 31. a third seal ring; 32. a main pressure control valve body; 33. a second limit spring; 34. a second steel ball; 35. a second gasket; 36. a first seal ring; 37. a screw plug; 38. a positioning rod; 39. a gear limiting block; 61. a first interface; 62. a second interface; 63. a third interface;

p, a first oil port; p ₁, a second oil port; p ₂, a third oil port; p ₃, a fourth oil port;

T ₁ and a fifth oil port; t ₂ and a sixth oil port; t ₃ and a seventh oil port;

G. A first oil chamber; H. a second oil chamber; K. and a third oil chamber.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Examples

1-6, A mechanical pressure-adjustable shift valve includes a main pressure control valve assembly 1, a shift valve assembly 2, and a pressure regulating valve assembly 3, the shift valve assembly 2 being disposed at an upper portion of the main pressure control valve assembly 1, the pressure regulating valve assembly 3 being disposed at a side of the main pressure control valve assembly 1; as shown in fig. 3, 4 and 5, the main pressure control valve assembly 1 comprises a main pressure control valve body 32, a main pressure oil cavity is arranged on the main pressure control valve body 32, and as shown in fig. 4 and 5, a first oil port P, a sixth oil port T ₂ and a seventh oil port T ₃ which are communicated with the main pressure oil cavity are also arranged on the main pressure control valve body 32, wherein the first oil port P is an oil inlet, and the sixth oil port T ₂ and the seventh oil port T ₃ are oil drain ports; as shown in fig. 3 and 5, the shift valve assembly 2 includes a shift valve body 29, a second oil port P ₁, a third oil port P ₂, a fourth oil port P ₃, and a fifth oil port T ₁ are provided on the shift valve body 29, the second oil port P ₁ is an oil inlet, the fifth oil port T ₁ is an oil drain port, a main pressure oil chamber on the main pressure control valve body 32 is communicated with the second oil port P ₁, the second oil port P ₁ can be communicated with the I-range clutch through the third oil port P ₂, the second oil port P ₁ can be communicated with the II-gear clutch through the third oil port P ₂; the pressure regulating valve assembly 3 comprises a pressure regulating valve body 17, a first oil cavity G and a second oil cavity H are arranged in the pressure regulating valve body 17, the second oil cavity H is communicated with a main pressure oil cavity through the first oil cavity G, a second oil port P ₁ on a gear shifting valve body 29 is communicated with the first oil cavity G on the pressure regulating valve body 17, and a fifth oil port T ₁ on the gear shifting valve body 29 is communicated with the second oil cavity H on the pressure regulating valve body 17;

The main pressure oil cavity comprises a first inner cavity and a second inner cavity, the first inner cavity and the second inner cavity are communicated with each other, the first oil port P is communicated with the first inner cavity, the second inner cavity is communicated with the first oil cavity G, and the inner diameter of the first inner cavity is smaller than that of the second inner cavity; the first oil port P and the seventh oil port T ₃ are communicated with the first inner cavity;

A small piston 10 matched with the small piston 10 is arranged in the first inner cavity, a large piston 14 matched with the large piston 14 is arranged in the second inner cavity, and the small piston 10 and the large piston 14 are connected through a first elastic piece;

The first pressure regulating valve core 22 and the second pressure regulating valve core 18 are arranged in the second oil cavity H, the second pressure regulating valve core 18 is inserted into a through hole which is communicated with the first oil cavity G and the second oil cavity H, the first pressure regulating valve core 22 is arranged in the second oil cavity H in a lifting manner, and the first pressure regulating valve core 22 and the second pressure regulating valve core 18 are connected through a second elastic piece; the sixth oil port T ₂ is communicated with the second oil cavity H and is used for preventing the pressure of the gear shifting valve from being too high. As shown in fig. 1 and 5, the shift valve body 29, the main pressure control valve body 32, and the pressure regulating valve body 17 are each provided with an internal oil passage that communicates with the oil ports.

The arrangement is that the oil pressure from the first oil cavity G to the second oil cavity H can be adjusted by adjusting the height of the valve core 22, so that the oil pressure of the first oil cavity G to the main pressure oil cavity is adjusted, the diameter of the large piston 14 is larger than that of the small piston, the pressure receiving surface of the large piston 14 is larger than that of the small piston 10, when the pressure in the first oil cavity G is increased, the large piston 14 can be driven to move left, the oil pressure of the first inner cavity is increased when the large piston 14 pushes the small piston 10 through the first elastic piece, and the pressure in the clutch is increased; when the pressure in the first oil chamber G becomes smaller, the first elastic member drives the large piston 14 to move rightward, and the small piston 10 is deformed by the first elastic member, so that the pressure in the clutch is reduced. ;

By the arrangement, the pressure of the mechanical gear shifting valve is not limited to the piston and the spring, the oil pressure in the main pressure oil cavity can be further controlled through the pressure regulating valve assembly 3, the pressure regulating range of the mechanical gear shifting valve is further increased, and the mechanical gear shifting valve has better universality and adaptability.

In order to facilitate the installation of each component of each gear shifting valve, in this embodiment, as shown in fig. 5, a main pressure oil cavity transversely penetrates through a main pressure oil cavity of a main pressure control valve body 32 to be plugged into a positioning ring 9, the positioning ring 9 seals the left end of the main pressure oil cavity through a fourth sealing ring 8, a baffle ring 7 is fixed at the left end of the main pressure oil cavity, and the baffle ring 7 is positioned at the left side of the positioning ring 9 to prevent the positioning ring 9 from moving leftwards out of the main pressure oil cavity; the right end of the positioning ring 9 is provided with a limiting part in a protruding mode, and the limiting part can prevent the piston from being connected with the positioning ring 9; the first oil port P is disposed between the small piston 10 and the positioning ring 9, and is located on a side surface of the limiting portion. The pressure regulating valve body 17 is fixed at the right end of the main pressure control valve body 32, an annular partition plate 16 is arranged at the joint of the pressure regulating valve body 17 and the main pressure control valve body 32, first sealing gaskets 15 are respectively fixed at two ends of the partition plate 16, and the two first sealing gaskets 15 respectively abut against the pressure regulating valve body 17 and the main pressure control valve body 32 so as to seal the pressure regulating valve body 17 and the main pressure control valve body 32. The shift valve body 29 is fixed to the main pressure control valve body 32, and a second gasket 35 is provided between the shift valve body 29 and the main pressure control valve body 32.

In order to facilitate driving of the piston, in this embodiment, the pressure regulating valve body 17 is provided with a third oil chamber K, the first oil chamber G is communicated with the main pressure oil chamber through the third oil chamber K, and the first oil chamber H is communicated with the fifth oil port T ₁. Thus, the arrangement of the inner oil duct is convenient. Further preferably, the third oil cavity K is annular groove-shaped, and the third oil cavity K faces the opening of the piston, so that the piston moves more stably, and the arrangement of the inner oil duct is more convenient.

In this embodiment, as shown in fig. 5, the first elastic member includes a first spring 11, a second spring 12, and a third spring 13, where the lengths of the first spring 11, the second spring 12, and the third spring 13 decrease in sequence, the second spring 12 is sleeved on the first spring 11, and the third spring 13 is sleeved on the second spring 12. By the arrangement, the application range of the gear shifting valve can be further improved. Further preferably, the stiffness coefficients of the first spring 11, the second spring 12, and the third spring 13 are sequentially increased.

In order to facilitate control of the pressure regulating valve assembly 3, in this embodiment, as shown in fig. 5, the first oil chamber G and the second oil chamber H are communicated through a tapered hole, and the second pressure regulating valve core 18 is a tapered valve core; the second pressure regulating valve core 18 is arranged in the second oil cavity H in a lifting mode, the bottom of the second pressure regulating valve core 18 is matched with the conical hole, the second pressure regulating valve core 18 is inserted into the conical hole, and the upper side part of the second pressure regulating valve core 18 is matched with the second oil cavity H and seals the upper part of the second oil cavity H. By adjusting the height of the second pressure regulating valve core 18, the depth of the second pressure regulating valve core 18 inserted into the conical hole can be controlled, so that the pressure in the second oil cavity H can be controlled, and the structure of the gear shifting valve is simpler and the control is more efficient.

Further preferably, the second oil cavity H is provided in an upward opening on the pressure regulating valve body 17, one end of the first pressure regulating valve core 22 is inserted into the second oil cavity H from top to bottom, and a spiral groove is formed on the outer peripheral surface of the first pressure regulating valve core 22; the inner wall of the second oil cavity H is provided with a limit groove, the limit groove is provided with a first steel ball 20, a first limit spring 21 is arranged between the first steel ball 20 and the inner wall of the limit groove, the first limit spring 21 pushes the first steel ball 20, part of the first steel ball 20 extends out of the limit groove and is inserted into a spiral groove of the first pressure regulating valve core 22, and the first steel ball 20 is attached to the inner wall of the spiral groove. By means of the arrangement, the height of the second pressure regulating valve core 18 can be adjusted by rotating the first pressure regulating valve core 22, and the limitation of the steel ball and the spring enables the movement of the first pressure regulating valve core 22 to be smoother and more sensitive. Further preferably, the limiting groove is a through hole, the outer end of the limiting groove is connected with a screw plug 37 in a threaded manner, and two ends of the first limiting spring 21 are respectively propped against the screw plug 37 and the first steel ball 20. By rotating the plug 37 in this manner, the position of the plug 37 in the limit groove is adjusted, and the pressure of the first steel ball 20 applied to the first pressure regulating valve core 22 can be adjusted. Further preferably, the bottom end of the first pressure regulating valve core 22 is inserted into the second oil cavity H, a fifth sealing ring 23 is arranged between the first pressure regulating valve core 22 and the second oil cavity H, and a pressure regulating handle 24 is installed on the other end of the first pressure regulating valve core 22.

Further preferably, the second elastic member includes a positioning rod 38 and a fourth spring 19, a positioning hole is formed at the bottom end of the first pressure regulating valve core 22, the upper portion of the positioning rod 38 is inserted into the positioning hole, the positioning rod 38 is slidably connected with the positioning hole, the second pressure regulating valve core 18 is fixed at the bottom of the positioning rod 38, the fourth spring 19 is sleeved on the positioning rod 38, and two ends of the fourth spring 19 are respectively connected with the first pressure regulating valve core 22 and the second pressure regulating valve core 18. The pressure regulating valve assembly 3 has enough buffer, and the gear shifting stability is improved.

In order to better control the pressure in the second oil cavity H, in this embodiment, as shown in fig. 1, the second oil port P ₁ on the shift valve 29 is communicated with the first oil cavity G on the pressure regulating valve 17 through the throttle valve 4, so that the clutch release can be better controlled; as shown in fig. 1, 2 and 6, the first oil cavity K is communicated with the fifth oil port T ₁ after passing through the check valve 5 and the shuttle valve 6, where the shuttle valve 6 includes a first port 61, a second port 62 and a third port 63, the first port 61 is communicated with an outlet of the check valve 5, the third oil port P ₂ is communicated with the second port 62, the third port 63 is communicated with the fourth oil port P ₃, the second port 62 and the third port 63 are all unidirectional oil inlets, and the first port 61 is a bidirectional oil port. Therefore, the gear shifting valve can rapidly release pressure in neutral, the pressure of the clutch which is in butt joint with the gear after gear engagement can be maintained, and the release clutch can rapidly release pressure. Specifically, as shown in fig. 6, the check valve 5 is disposed in an inner oil duct that communicates the third oil chamber K and the fifth oil port T ₁, the inner oil duct is disposed on the main pressure control valve body 32, the inner oil duct communicates with the bottom of the third oil chamber K, through holes that communicate the third oil chamber K and the inner oil duct are all formed in the partition plate 16 and the sealing gasket, the check valve 5 includes a second steel ball 34 and a second limiting spring 33, the second steel ball 34 and the second limiting spring 33 are all disposed in the inner oil duct, two ends of the second limiting spring 33 respectively abut against an inner wall of the inner oil duct and the second steel ball 34, and the second limiting spring 33 pushes the second steel ball 34 to make part of the second steel ball 34 extend out of the inner oil duct and insert into the through hole of the partition plate 16.

In this embodiment, as shown in fig. 5, the shift valve assembly 2 is a three-position four-way rotary valve, and the shift valve assembly 2 further includes a reversing handle 25, a first sealing ring 36, a second sealing ring 27, a third sealing ring 31, a mounting bracket 26, a reversing valve core 28, a plug 30, a gear limiting block 39 and an elastic pin 36; specifically, the left end of the shift valve body 29 is provided with an opening, the third oil port P ₂ and the fourth oil port P ₃ are both communicated with the opening of the shift valve body 29, the reversing valve core 28 is rotatably installed on the installing support 26, the right end of the reversing valve core 28 is inserted into the opening of the shift valve body 29, the second oil port P ₁ is arranged on the reversing valve core 28, the fifth oil port T ₁ is a notch arranged on the right side of the outer surface of the reversing valve core 28, oil in the I-gear clutch can be rapidly discharged when the third oil port P ₂ is communicated with the fifth oil port T ₁, and oil in the II-gear clutch can be rapidly discharged when the fourth oil port P ₃ is communicated with the fifth oil port T ₁.

The second oil port P ₁ includes a first communication portion, a second communication portion and a third communication portion, the second communication portion is disposed in the reversing valve core 28, the first communication portion is a notch disposed on an outer surface of the reversing valve core 28, the first communication portion and the second communication portion are in communication arrangement, and the third communication portion is disposed on an outer surface of the reversing valve core 28 and is located in communication arrangement of the second communication portion.

The mounting bracket 26 is fixed at the left end of the gear shifting valve body 29, the mounting bracket 26 seals the opening of the gear shifting valve body 29 through the second sealing ring 27, the third sealing ring 31 is arranged on the reversing valve core 28 and the mounting bracket 26, the gear limiting block 39 is fixed on the reversing valve core 28 through the elastic pin 36, the gear limiting block 39 is positioned outside the gear shifting valve body 29, the first sealing ring is arranged between the gear limiting block 39 and the elastic pin 36, and the reversing handle 25 is arranged at the left end of the reversing valve core 28; the second oil ports P ₁ are arranged on the reversing valve core 28, two second oil ports P ₁ are arranged, two second oil ports P ₁ are respectively communicated with the third oil port P ₂ and the fourth oil port P ₃, the two second oil ports P ₁ are both communicated with an inner oil duct of the reversing valve core 28, the inner oil duct on the reversing valve core 28 comprises an opening arranged at the right end of the inner oil duct, a plug 30 is fixed on the reversing valve core 28, and the plug 30 seals the right end of the opening of the reversing valve core 28.

The method for regulating the pressure of the mechanical gear shifting valve comprises the following steps:

When the mechanical shift valve is in the neutral state: the second oil port is cut off, oil enters the first inner cavity through the first oil port P, pushes the small piston 10 to move right, and is discharged from the seventh oil port T ₃; oil in the I gear clutch is discharged from a fifth oil port T ₁ after passing through a third oil port P ₂, and oil in the II gear clutch is discharged from a fifth oil port T ₁ after passing through a fourth oil port P ₃; the oil in the first oil cavity G and the second oil cavity H sequentially passes through the one-way valve 5 and the shuttle valve 6 and is discharged from the fifth oil port T ₁;

When the mechanical gear shifting valve is engaged in I gear: the oil sequentially enters the I-gear clutch through the first oil port P, the main pressure oil cavity, the second oil port P ₁ and the third oil port P ₂, the I-gear clutch is connected and arranged, the oil in the third oil port P ₂ enters the shuttle valve 6 from the second port 62 and then plugs the third port 63, and the oil entering the shuttle valve enters the check valve 5 from the first port 61 and the outlet of the check valve 5 to plug the check valve 5; the fourth oil port P ₃ is communicated with the fifth oil port T ₁, oil in the II-gear clutch cannot enter the shuttle valve 6 from the third interface 63, the oil in the II-gear clutch is discharged through the fourth oil port P ₃ and the fifth oil port T ₁ in sequence, and the II-gear clutch is discharged; part of oil in the second oil port enters a first oil cavity G, the oil in the first oil cavity G cannot be discharged through a one-way valve 5, the oil in the first oil cavity G pushes a second regulating valve core 18 to enter a second oil cavity H, and the oil in the first oil cavity G enters a second inner cavity to push a large piston 14;

When the mechanical gear shifting valve is in II gear: the oil sequentially enters a II-gear clutch through a first oil port P, a main pressure oil cavity, a second oil port P ₁ and a fourth oil port P ₃, the II-gear clutch is connected and arranged, the oil in a fourth oil port P ₃ simultaneously enters a shuttle valve 6 through a third port 63 to block a second port 62, and the oil entering the shuttle valve 6 enters the check valve 5 from an outlet of the check valve 5 through a first port 61 to block an inlet of the check valve 5; the third oil port P ₂ is communicated with the fifth oil port T ₁, oil in the I-gear clutch cannot enter the shuttle valve 6 from the second connector 62, and the oil in the I-gear clutch is discharged from the fifth oil port T ₁ after passing through the third oil port P ₂; part of oil in the second oil port enters a first oil cavity G, the oil in the first oil cavity G cannot be discharged through a one-way valve 5, the oil in the first oil cavity G pushes a second regulating valve core 18 to enter a second oil cavity H, and the oil in the first oil cavity G enters a second inner cavity to push a large piston 14;

The pressure regulation mode in the mechanical gear shifting valve is as follows: after the I-gear clutch or the II-gear clutch is connected and discharged, the height 22 of the first pressure regulating valve core is adjusted, the pressure of the second elastic piece to the second pressure regulating valve core 18 is changed, the oil pressure in the first oil cavity G is changed, the pressure of the first oil cavity G to the large piston 14 is changed, the pressure receiving area of the large piston is larger than that of the small piston, the pressure of the first elastic piece is changed after the stress of the large piston is changed, and the pressure in the I-gear clutch or the II-gear clutch is changed.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the utility model.

Claims (10)

1. A mechanical pressure adjustable shift valve comprising a main pressure control valve assembly (1) and a shift valve assembly (2), characterized in that: the automatic transmission device further comprises a pressure regulating valve assembly (3), wherein the gear shifting valve assembly is arranged at the upper part of the main pressure control valve assembly (1), and the pressure regulating valve assembly (3) is arranged on the side surface of the main pressure control valve assembly (1);

The main pressure control valve assembly (1) comprises a main pressure control valve body (32), a first inner cavity and a second inner cavity which are mutually communicated are arranged in the main pressure control valve body (32), the inner diameter of the first inner cavity is smaller than that of the second inner cavity, a small piston (10) is arranged in the first inner cavity, a large piston (14) is arranged in the second inner cavity, the small piston (10) and the large piston (14) are connected through a first elastic piece, a first oil port (P), a sixth oil port (T ₂) and a seventh oil port (T ₃) are arranged on the main pressure control valve body (32), the first oil port (P) is an oil inlet, the sixth oil port (T ₂) and the seventh oil port (T ₃) are oil drain ports, and the first oil port (P) and the seventh oil port (T ₃) are both communicated with the first inner cavity;

The gear shifting valve assembly comprises a gear shifting valve body (29) and a reversing valve core (28), a third oil port (P ₂) and a fourth oil port (P ₃) are arranged on the gear shifting valve body (29), the third oil port (P ₂) is communicated with an I-gear clutch, the fourth oil port (P ₃) is communicated with an II-gear clutch, the reversing valve core (28) is rotatably arranged on the gear shifting valve body (29), and a second oil port (P ₁) and a fifth oil port (T ₁) are arranged on the reversing valve core (28); the first inner cavity can be communicated with a third oil port (P ₂) or a fourth oil port (P ₃) through a second oil port (P ₁);

The pressure regulating valve assembly (3) comprises a pressure regulating valve body (17), a first pressure regulating valve core (22) and a second pressure regulating valve core (18), wherein a first oil cavity (G) and a second oil cavity (H) which are mutually communicated through a through hole are arranged in the pressure regulating valve body (17), the first pressure regulating valve core (22) is installed in the second oil cavity (H) in a lifting manner, the second pressure regulating valve core (18) is connected with the first pressure regulating valve core (22) through a second elastic piece, and the second pressure regulating valve core (18) is spliced with the through hole; the second oil cavity (H) is communicated with a sixth oil port (T ₂); the second oil port (P ₁) is communicated with the first oil cavity (G), and the second inner cavity is communicated with the first oil cavity (G);

The hydraulic oil pump further comprises a shuttle valve (6) and a one-way valve (5), wherein the shuttle valve (6) comprises a first interface, a second interface and a third interface, the first interface is connected with an outlet of the one-way valve (5), the second interface is connected with a third oil port (P ₂), the third interface is connected with a fourth oil port (P ₃), and the one-way valve (5) is communicated with the first oil cavity (G).

2. A mechanical pressure adjustable shift valve according to claim 1, wherein: the gear shifting valve body (29) is provided with an opening, a third oil port (P ₂) and a fourth oil port (P ₃) are communicated with the opening of the gear shifting valve body (29), one end of the reversing valve core (28) is inserted into the opening of the gear shifting valve body (29) and is rotationally connected with the gear shifting valve body (29), a second oil port (P ₁) is arranged on the reversing valve core (28) and is positioned in the opening of the gear shifting valve body (29), a fifth oil port (T ₁) is a notch arranged on the outer surface of the reversing valve core (28), and the fifth oil port (T ₁) is communicated with the third oil port (P ₂) and/or the fourth oil port (P ₃).

3. A mechanical pressure adjustable shift valve according to claim 2, characterized in that: one end of the reversing valve core (28) is provided with a reversing handle (25) at the other end.

4. A mechanical pressure adjustable shift valve according to claim 1, wherein: the second oil port (P ₁) is communicated with the first oil cavity (G) through a throttle valve (4).

5. A mechanical pressure adjustable shift valve according to claim 1, wherein: the second pressure regulating valve core (18) is a conical valve.

6. A mechanical pressure adjustable shift valve according to claim 1, wherein: the second oil cavity (H) is arranged in an upward opening on the pressure regulating valve body (17), one end of the first pressure regulating valve core (22) is inserted into the second oil cavity (H) from top to bottom, a spiral groove is formed in the outer peripheral surface of the first pressure regulating valve core (22), a protruding limiting piece on the inner wall of the second oil cavity (H) is inserted into the spiral groove, and the limiting piece is attached to the inner wall of the spiral groove.

7. The mechanical pressure-adjustable shift valve of claim 6, wherein: the limiting piece comprises a first steel ball (20) and a first limiting spring (21), a limiting groove communicated with a second oil cavity (H) is formed in the pressure regulating valve body (17), the first limiting spring (21) is arranged in the limiting groove, two ends of the first limiting spring (21) respectively abut against the inner wall of the limiting groove and the first steel ball (20), and the first limiting spring (21) pushes the first steel ball (20) to enable a part of the first steel ball (20) to extend out of the limiting groove and be attached to the inner wall of a spiral groove of the first pressure regulating valve core (22).

8. The mechanical pressure-adjustable shift valve of claim 6, wherein: one end of the first pressure regulating valve core (22) is provided with a pressure regulating handle (24).

9. A mechanical pressure adjustable shift valve according to claim 1, wherein: the second elastic piece comprises a positioning rod (38) and a fourth spring (19), a positioning hole is formed in the bottom end of the first pressure regulating valve core (22), the upper side portion of the positioning rod (38) is inserted into the positioning hole, the positioning rod (38) is slidably connected with the positioning hole, the second pressure regulating valve core (18) is fixed at the bottom of the positioning rod (38), the fourth spring (19) is sleeved on the positioning rod (38), and two ends of the fourth spring (19) are connected with the first pressure regulating valve core (22) and the second pressure regulating valve core (18) respectively.

10. A mechanical pressure adjustable shift valve according to claim 1, wherein: the first elastic piece comprises a first spring (11), a second spring (12) and a third spring (13), the lengths of the first spring (11), the second spring (12) and the third spring (13) are sequentially reduced, the second spring (12) is sleeved on the first spring (11), the third spring (13) is sleeved on the second spring (12), and two ends of the third spring (13) are respectively connected with the large piston and the small piston.