Slide valve device

Abstract

The invention discloses a slide valve device, belongs to the technical field of valves, and is applied to aviation, aerospace and hydraulic machinery. The sliding valve device comprises a shell, a valve sleeve, a valve element, a left end cover and a right end cover, oil return cavities are formed in the two ends of the valve element, a thin sliding core mechanism and a thick sliding core mechanism are arranged at the two ends of the valve element, the thin sliding core mechanism is communicated with an oil inlet cavity, and the thick sliding core mechanism is communicated with a control cavity. The thin sliding core mechanism is used for pushing the valve element to move towards one end of the thick sliding core mechanism, and the thick sliding core mechanism is used for pushing the valve element to move towards one end of the thin sliding core mechanism. The sliding cores with different diameters at the two ends are combined with the pressure change of the control cavity, left-right movement of the valve element is achieved, and under the condition that the valve element size and the flow opening degree of the same specification are guaranteed, the diameters of the sliding cores at the two ends are reasonably matched, and impact noise generated by movement of the valve element is reduced.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically to a slide valve device. Background Technology

[0002] Spool valves are commonly used hydraulic or pneumatic structures in the aerospace and mechanical fields. Through the movement of the spool valve and the structure of the valve sleeve and spool valve, the direction of liquid or gas flow is changed to achieve the corresponding product function. Due to the action of liquid or gas flow, when the spool valve is working, the movement of the valve core will collide with the stop at the end of the valve core. Due to the high pressure characteristics in the aerospace field, the collision force is relatively high, which will generate noise.

[0003] Figure 1 The diagram shows the spool valve structure of a shut-off valve used in aviation braking. It has the disadvantage of being noisy. During operation, the third valve core 003 will collide with the third left end cover 005. The measured impact noise during operation reaches more than 100dB.

[0004] Therefore, it is necessary to improve the existing spool valve structure to reduce the movement impact and operating noise of the spool valve without changing its flow function. Summary of the Invention

[0005] The technical problem to be solved: To avoid the shortcomings of the prior art, the present invention provides a spool valve device. Through a series structure design, a return oil chamber and a spool mechanism are designed at both ends of the valve core. The valve core moves left and right by controlling the pressure change of the control chamber by spools with different diameters at both ends. While ensuring the valve core size and flow opening of the same specification, the impact noise generated by the movement of the valve core is reduced by reasonably matching the diameters of the spools at both ends.

[0006] The technical solution of this invention is: a spool valve device, comprising a housing, a valve sleeve, a valve core, a left end cap, and a right end cap, wherein the valve sleeve is fixedly installed inside the housing, the valve core is slidably installed inside the valve sleeve, and the left end cap and right end cap are respectively installed at both ends of the valve sleeve and are both fixedly connected to the housing; characterized in that: Both ends of the valve core are provided with oil return chambers. The valve core has a fine sliding core mechanism on the left end facing the end cover and a coarse sliding core mechanism on the right end facing the end cover. The fine sliding core mechanism is connected to the oil inlet chamber, and the coarse sliding core mechanism is connected to the control chamber. The fine sliding core mechanism is used to push the valve core to move towards the coarse sliding core mechanism, and the coarse sliding core mechanism is used to push the valve core to move towards the fine sliding core mechanism. The movement of the valve core is used to control the connection between the working chamber and the oil inlet chamber or the working chamber and the oil return chamber. The return oil chamber, inlet oil chamber, control chamber, and working chamber are independent cavity structures formed between the fine sliding core mechanism, valve sleeve, coarse sliding core mechanism, left end cover, and right end cover after they are installed in the housing. The return oil chamber is connected to the return oil port on the housing, the inlet oil chamber is connected to the inlet oil port on the housing, the working chamber is connected to the brake port on the housing, and the control chamber is connected to the solenoid valve outside the slide valve device. The solenoid valve controls the control chamber to connect the inlet oil or return oil.

[0007] A further technical solution of the present invention is: the fine sliding core mechanism includes a fine sliding core and a fine-hole sliding sleeve. The fine sliding core is coaxially and slidably installed in the through hole of the fine-hole sliding sleeve. One end of the valve sleeve is embedded in the inner side of the fine-hole sliding sleeve and is tightly fitted thereto. The left end cover is embedded in the outer side of the fine-hole sliding sleeve and is clearance fitted thereto. The oil in the oil inlet chamber is connected to the end of the fine sliding core facing the left end cover.

[0008] A further technical solution of the present invention is: the coarse sliding core mechanism includes a coarse sliding core and a coarse hole sliding sleeve. The coarse sliding core is coaxially and slidably installed in the through hole of the coarse hole sliding sleeve. One end of the valve sleeve is embedded in the inner side of the coarse hole sliding sleeve and is tightly fitted therewith. The oil in the oil inlet chamber is connected to the end of the coarse sliding core facing the right end cover.

[0009] A further technical solution of the present invention is that the gap between the fine sliding core and the fine-hole sliding sleeve, and the gap between the coarse sliding core and the coarse-hole sliding sleeve are both within 0.01mm.

[0010] A further technical solution of the present invention is that the outer diameter walls of both the fine and coarse slip cores are provided with pressure equalization grooves, which are used to balance radial pressure and prevent sliding jamming.

[0011] A further technical solution of the present invention is: the fine sliding core mechanism and the coarse sliding core mechanism further include a throttling screw plug, a left throttling screw plug is fixedly installed at the end of the fine-hole sliding sleeve of the fine sliding core mechanism away from the valve core, and a right throttling screw plug is fixedly installed at the end of the coarse-hole sliding sleeve of the coarse sliding core mechanism away from the valve core. The left throttling screw plug and the right throttling screw plug have the same structure, and the throttling screw plug is provided with a through hole along the central axis. The fine-hole sliding sleeve has a stepped cylindrical structure with a radial first protrusion in its middle. The first protrusion is sandwiched between the left end cover and the valve sleeve and is located at the oil inlet cavity. The end of the fine-hole sliding sleeve that is embedded in the left end cover has a second radial groove. The contact surface between the left end cover and the first protrusion has a first radial hole. The oil in the oil inlet cavity enters the fine sliding core facing the left end cover through the first radial hole, the radial gap where the fine-hole sliding sleeve is embedded in the left end cover, the second radial groove, and the through hole of the left throttling screw. The coarse-hole sliding sleeve has a stepped cylindrical structure with a second radial protrusion in its middle. The second protrusion is sandwiched between the right end cover and the valve sleeve and is located at the control cavity. The outer side of the coarse-hole sliding sleeve is embedded in the right end cover and has a clearance fit with it. The end of the coarse-hole sliding sleeve embedded in the right end cover has a fourth radial groove. The contact surface between the right end cover and the second protrusion has a third radial hole. The oil in the control cavity enters the coarse sliding core facing the right end cover through the third radial hole, the radial clearance where the coarse-hole sliding sleeve is embedded in the right end cover, the fourth radial groove, and the through hole of the right throttling screw plug.

[0012] A further technical solution of the present invention is as follows: the valve core is a solid stepped shaft, and its outer diameter is provided with a radially protruding third protrusion and a fourth protrusion, forming a first recess between the two, and the fourth protrusion forms a second recess away from the outer side of the third protrusion; a first oil inlet chamber, a second oil inlet chamber, a first oil return chamber, a second oil return chamber, a first working chamber, and a first control chamber are formed inside the housing; the first oil inlet chamber and the second oil inlet chamber are connected and connected to the oil inlet of the housing; the first oil return chamber and the second oil return chamber are connected and connected to the oil return port; the first working chamber is connected to the brake port; the first control chamber is connected to the oil circuit controlled by the solenoid valve; When the valve core is at the leftmost end, the second return oil chamber and the first working chamber are connected through the second recess; when the valve core is at the rightmost end, the second inlet oil chamber and the first working chamber are connected through the first recess.

[0013] A further technical solution of the present invention is that both the fine-hole sliding sleeve and the coarse-hole sliding sleeve are cylindrical structures; The end face of the fine-hole sliding sleeve embedded in the left end cover is provided with a fifth radial groove, and a first axial gap is provided between the left end cover and the valve sleeve. The first axial gap is located at the oil inlet chamber. The oil in the oil inlet chamber enters the fine sliding core facing the left end cover through the first axial gap, the radial gap where the fine-hole sliding sleeve is embedded in the left end cover, and the fifth radial groove. The coarse-hole sliding sleeve is embedded in the valve sleeve, and its outer end is flush with the valve sleeve. A second axial gap is provided between the valve sleeve and the right end cover. The second axial gap is located in the control chamber. The oil in the control chamber enters the coarse sliding core facing the right end cover through the second axial gap.

[0014] A further technical solution of the present invention is as follows: the valve core is a stepped shaft with a through hole along the axis, and its outer diameter is provided with a fifth protrusion and a sixth protrusion that protrude radially, forming a third recess between the two, and the sixth protrusion forms a fourth recess away from the outer side of the fifth protrusion; a third oil inlet chamber, a second working chamber, a third oil return chamber and a second control chamber are formed inside the housing, the third oil inlet chamber is connected to the oil inlet, the third oil return chamber is connected to the oil return port, the second working chamber is connected to the brake port, and the second control chamber is connected to the solenoid valve; When the valve core is at the leftmost end, the third return oil chamber and the second working chamber are connected through the fourth recess and the radial gap between the coarse sliding core and the valve sleeve; when the valve core is at the rightmost end, the third inlet oil chamber and the second working chamber are connected through the third recess. The third return oil chamber is connected to both ends of the valve core through a through hole in the center of the valve core, and is used to connect the return oil chamber.

[0015] A further technical solution of the present invention is: the outer diameter of the valve sleeve is provided with multiple sealing ring grooves for installing sealing rings, thereby achieving hydraulic isolation between adjacent cavities through the sealing rings.

[0016] The beneficial effects of this invention are: By setting sliding core mechanisms at both ends of the valve core, the fine sliding core, valve core, and coarse sliding core form a coaxial series structure. Return oil chambers are designed on both sides of the valve core. Through the fine and coarse sliding cores of different diameters, combined with pressure changes in the control chamber (with or without pressure), hydraulic thrust is provided to the valve core in different directions, enabling the valve core to move left or right. Regardless of the inlet oil pressure, as long as the diameters of the fine and coarse sliding cores are properly matched, lower thrust or impact can be achieved. This reduces noise while still fulfilling the valve core's movement function, making it suitable for applications with high inlet oil pressure where noise reduction is also a consideration.

[0017] Without changing the valve core diameter and spool valve flow opening, the spool valve using the structure of this invention significantly reduces motion impact noise, achieving a reduction of impact noise during spool valve operation to below 50dB. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of an existing slide valve structure; Figure 2 This is a cross-sectional view of a slide valve device according to Embodiment 1 of the present invention; Figure 3 This is a structural diagram of the first fine-smooth core 3 in Example 1; Figure 4 This is a structural diagram of the first coarse lubricating core 11 in Example 1; Figure 5 This is a structural diagram of the first fine-hole sliding sleeve 8 in Example 1; Figure 6 This is a structural diagram of the first coarse-hole sliding sleeve 10 in Example 1; Figure 7 This is a structural diagram of the first valve sleeve 2 in Example 1; Figure 8 This is a structural diagram of the first left end cap 4 in Example 1; Figure 9 This is a structural diagram of the first right end cap 5 in Embodiment 1; Figure 10 This is a cross-sectional view of a slide valve device according to Embodiment 2 of the present invention; Figure 11 This is a structural diagram of the second fine slip core 26 in Example 2; Figure 12 This is a structural diagram of the second coarse lubricating core 28 in Example 2; Figure 13 This is a structural diagram of the second fine-hole sliding sleeve 25 in Example 2; Figure 14 This is a structural diagram of the second coarse-hole sliding sleeve 27 in Example 2; Figure 15 This is a structural diagram of the second left end cap 23 in Example 2; Figure 16 This is a structural diagram of the second right end cap 24 in Example 2; Figure 17 This is a structural diagram of the second valve sleeve 21 in Example 2.

[0020] In the picture: 1. First housing; 2. First valve sleeve; 2-1. Fine-hole sliding sleeve sealing surface of the first valve sleeve; 2-2. Valve core slideway of the first valve sleeve; 2-3. Coarse-hole sliding sleeve sealing surface of the first valve sleeve; 2-4. Oil return through hole of the first valve sleeve; 2-5. Sealing ring groove of the first valve sleeve; 2-6. First oil return chamber of the first valve sleeve; 2-7. Second oil inlet chamber of the first valve sleeve; 2-8. Working chamber of the first valve sleeve; 2-9. Second oil return chamber of the first valve sleeve; 2-10. Control chamber of the first valve sleeve; 3. First valve core; 3-1. Third protrusion; 3-2. Fourth protrusion; 3-3. First recess; 3-4. Second recess; 4. First... Left end cap, 4-1. First radial hole, 4-2. Center hole of the first left end cap, 4-3. Sealing ring groove of the first left end cap, 4-4. Outer protrusion of the first left end cap, 4-5. Mounting hole of the first left end cap, 5. First right end cap, 5-1. Third radial hole, 5-2. Center hole of the first right end cap, 5-3. Sealing ring groove of the first right end cap, 5-4. Outer protrusion of the first right end cap, 5-5. Mounting hole of the first right end cap, 6. Left throttling plug, 7. Right throttling plug, 8. First fine-hole sliding sleeve, 8-1. First protrusion, 8-2. Second radial groove, 8-3. First fine-hole sliding sleeve mating shaft, 8-4. 8-5. First fine-hole sliding sleeve end face groove; 8-6. First fine-hole sliding sleeve sealing groove; 8-7. First fine-hole sliding sleeve slideway; 8-8. First fine-hole sliding sleeve flow shaft; 8-9. First fine-hole sliding sleeve internal threaded hole; 9-1. First fine-slip core; 9-2. First fine-slip core push rod part; 9-3. First fine-slip core transition part; 9-4. First fine-slip core pressure equalizing groove; 9-5. First fine-slip core push head; 10. First coarse-hole sliding sleeve; 10-1. Second protrusion; 10-2. Fourth radial groove; 10-3. First coarse-hole sliding sleeve mating shaft; 10-4. First coarse-hole sliding sleeve end face groove; 10-5. 10-6. First coarse-hole sliding sleeve sealing groove; 10-7. First coarse-hole sliding sleeve slideway; 10-8. First coarse-hole sliding sleeve internal threaded hole; 11. First coarse sliding core; 11-1. First coarse sliding core sliding outer diameter; 11-2. First coarse sliding core push rod part; 11-3. First coarse sliding core transition part; 11-4. First coarse sliding core pressure equalizing groove; 11-5. First coarse sliding core push head; 12. First oil inlet chamber; 13. Second oil inlet chamber; 14. First oil return chamber; 15. Second oil return chamber; 16. First working chamber; 17. First control chamber; 18. First sealing ring; 19. Second sealing ring; 20. Second housing; 21. Second valve sleeve; 21-1. Stop end; 21-2. Outer diameter of sleeve; 21-3. Sealing ring groove of second valve sleeve; 21-4. Fine-hole sliding sleeve mounting hole of second valve sleeve; 21-5. Valve core mounting hole of second valve sleeve; 21-6. Coarse-hole sliding sleeve mounting hole of second valve sleeve; 21-7. Oil inlet chamber of second valve sleeve; 21-8. Working chamber of second valve sleeve; 21-9. Oil return chamber of second valve sleeve; 22. Second valve core; 22-1. Through hole of valve core; 22 -2. Fifth protrusion, 22-3. Sixth protrusion, 22-4. Third recess, 22-5. Fourth recess, 23. Second left end cap, 23-1. Inner hole of second left end cap, 23-2. External thread of second left end cap, 23-3. Sealing ring groove of second left end cap, 23-4. Outer end face of second left end cap, 23-5. Hexagonal hole of second left end cap, 24. Second right end cap, 24-1. Hexagonal hole of second right end cap, 24-2. Outer end face of second right end cap, 24 -3. Sealing ring groove of the second right end cover; 24-4. Hole groove of the second right end cover; 24-5. External thread of the second right end cover; 24-6. Inner end face of the second right end cover; 24-7. Inner hole of the second right end cover; 24-8. Inner end groove of the second right end cover; 25. Second fine hole sliding sleeve; 25-1. Fifth radial groove; 25-2. Slide path of the second fine hole sliding sleeve; 26. Second fine sliding core; 26-1. Pressure equalizing groove of the second fine sliding core; 26-2. Push head of the second fine sliding core; 26-3. 27. Second coarse-hole sliding sleeve, 27-1. Slide path of the second coarse-hole sliding sleeve, 27-2. Sealing groove of the second coarse-hole sliding sleeve, 28. Second coarse sliding core, 28-1. Pressure equalization groove of the second coarse sliding core, 28-2. Push head of the second coarse sliding core, 28-3. Tail groove of the second coarse sliding core, 29. Third oil inlet chamber, 30. Second working chamber, 31. Third oil return chamber, 32. Second control chamber, 33. Third sealing ring, 34. Fourth sealing ring, 35. Fifth sealing ring; 001. Third housing, 002. Third valve sleeve, 003. Third valve core, 004. Piston, 005. Third left end cover, 006. Third right end cover, 007. Plug, 008. Sixth sealing ring, 009. Seventh sealing ring. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1 An embodiment of the slide valve device of the present invention, such as... Figure 2As shown, it includes: a first housing 1, a first valve sleeve 2, a first valve core 3, a first left end cover 4, a first right end cover 5, a first fine lubricating core mechanism, and a first coarse lubricating core mechanism.

[0023] The first housing 1 serves as the support housing for the spool valve and is a hollow cylindrical structure with open ends. The first housing 1 is provided with an oil inlet, an oil return port, and a brake port. The oil inlet is connected to the oil inlet circuit on the outside and to the oil inlet chamber of the spool valve on the inside. The oil return port is connected to the oil return circuit on the outside and to the oil return chamber of the spool valve on the inside. The brake port is connected to the brake control circuit on the outside and to the working chamber of the spool valve on the inside.

[0024] The first valve sleeve 2 is coaxially fixedly installed inside the first housing 1, the first valve core 3 is coaxially slidably installed inside the first valve sleeve 2, the first left end cover 4 is installed on the left end of the first valve sleeve 2, the first right end cover 5 is installed on the right end of the first valve sleeve 2, and both the left and right end covers are fixedly connected to the first housing 1.

[0025] The first valve core 3 has return oil chambers at both ends. The end of the first valve core 3 facing the first left end cover 4 has a first fine sliding core mechanism, and the end of the first valve core 3 facing the first right end cover 5 has a first coarse sliding core mechanism. The first fine sliding core mechanism connects to the inlet oil chamber, and the first coarse sliding core mechanism connects to the control chamber. The first fine sliding core mechanism pushes the first valve core 3 towards the first coarse sliding core mechanism, and the first coarse sliding core mechanism pushes the first valve core 3 towards the first fine sliding core mechanism. The movement of the first valve core 3 controls the connection between the working chamber and the inlet oil chamber or between the working chamber and the return oil chamber, thereby controlling the brake.

[0026] The return oil chamber, inlet oil chamber, control chamber, and working chamber are independent cavity structures formed by the first fine sliding core mechanism, the first valve sleeve 2, the first coarse sliding core mechanism, the first left end cover 4, and the first right end cover 5 after they are installed on the first housing 1. The return oil chamber is connected to the return oil port on the first housing 1, the inlet oil chamber is connected to the inlet oil port on the first housing 1, the working chamber is connected to the brake port on the first housing 1, and the control chamber is connected to the solenoid valve outside the slide valve device. The solenoid valve controls the control chamber to connect the inlet oil or the return oil.

[0027] In this embodiment, from the left end where the first fine lubricating core mechanism is located to the right end where the first coarse lubricating core mechanism is located, the first housing 1 sequentially forms a first oil inlet chamber 12, a first oil return chamber 14, a second oil inlet chamber 13, a first working chamber 16, a second oil return chamber 15, and a first control chamber 17. The first oil inlet chamber 12 and the second oil inlet chamber 13 are connected through an internal oil passage in the first housing 1 and are connected to the oil inlet of the first housing 1. The first oil return chamber 14 and the second oil return chamber 15 are connected through another internal oil passage in the first housing 1 and are connected to the oil return port of the first housing 1. The first working chamber 16 is connected to the brake port of the first housing 1. The first control chamber 17 is connected to the oil circuit controlled by the solenoid valve. The first oil inlet chamber 12, the first oil return chamber 14, the second oil inlet chamber 13, the first working chamber 16, the second oil return chamber 15, and the first control chamber 17 are independent of each other, and hydraulic isolation between adjacent chambers is achieved through a first sealing ring 18.

[0028] Specifically, the first fine sliding core mechanism includes a first fine sliding core 9, a first fine-hole sliding sleeve 8, and a left throttling plug 6. For example... Figure 5 As shown, the first fine-hole sliding sleeve 8 has a stepped cylindrical structure, with an annular radial first protrusion 8-1 in its middle. Inside the first protrusion 8-1 is a first fine-hole sliding sleeve mating shaft 8-3, which is used to fit tightly into the left end of the central inner hole of the first valve sleeve 2. Outside the first protrusion 8-1 is a first fine-hole sliding sleeve flow shaft 8-7, which is used to fit with the central hole 4-2 of the first left end cover 4. The outer diameter of the mating shaft 8-3 has a first fine-hole sliding sleeve sealing groove 8-5, which is used to install a second sealing ring 19 to achieve a seal between the mating shaft 8-3 and the first valve sleeve 2. At the center of the outer end face of the flow shaft 8-7 is a first fine-hole sliding sleeve internal threaded hole 8-8, which is used to install the left throttling plug 6. The first fine-hole sliding sleeve 8 has a through hole along its axis, serving as a first fine-hole sliding sleeve slide 8-6. The slide 8-6 and the internal threaded hole 8-8 are coaxial, and the slide 8-6 is used for sliding installation of the first fine sliding core 9. The first fine-hole sliding sleeve 8 has a second radial groove 8-2 on the mounting end face of the left throttling plug 6, and the first fine-hole sliding sleeve end face groove 8-4 is provided on the inner end face of the first fine-hole sliding sleeve extending into the first valve sleeve 2. The end face groove 8-4 is arranged radially.

[0029] like Figure 3 As shown, the first fine slip core 9 is a stepped rod structure, and the outer diameter of its main rod is... Figure 3The first fine sliding core 9-1 has a sliding outer diameter of 9-1, which slides in conjunction with the inner wall of the slideway 8-6 of the first fine-hole sliding sleeve 8. The sliding fit clearance between the first fine sliding core 9 and the first fine-hole sliding sleeve 8 is within 0.01mm. The main body of the first fine sliding core 9 has four evenly distributed pressure-equalizing grooves 9-4, which are used to balance radial pressure and prevent sliding jamming. The inner side of the main body is the first fine sliding core push rod 9-2, which transitions to the main body with a conical surface, forming the first fine sliding core transition section 9-3. The end of the push rod 9-2 facing away from the transition section 9-3 has an arc-shaped structure, forming the first fine sliding core push head 9-5. During operation, the push head 9-5 contacts the left end face of the first valve core 3. Figure 2 As shown, the left throttle plug 6 has an external thread on its outer diameter to achieve a screw-in fit with the internal threaded hole 8-8 of the first fine-hole sliding sleeve 8. The left throttle plug 6 has a through hole along its axis for oil passage. In this embodiment, the sliding outer diameter of the first fine sliding core 9 is 2mm.

[0030] like Figure 2 and Figure 8 As shown, the inner side of the first left end cover 4 is embedded in the first housing 1, and the outer side forms a radially protruding end cover that blocks the left end face of the first housing 1. The outer diameter of the first left end cover 4 embedded in the first housing 1 is provided with a first left end cover sealing ring groove 4-3 for inserting the first sealing ring 18 to achieve a sealed connection between the two. The inner center of the first left end cover 4 is provided with a recessed first left end cover center hole 4-2, which is used for clearance fit with the flow shaft 8-7 of the first fine hole sliding sleeve 8. The inner side of the first left end cover 4 is provided with a radially arranged first radial hole 4-1 near the inner end face, which connects to the center hole 4-2 for oil passage. The outer side of the first left end cover 4 is a radially protruding first left end cover outer end protrusion 4-4, which is provided with four first left end cover mounting holes 4-5 to achieve connection with the first housing 1 by fasteners.

[0031] like Figure 2 As shown, after the first fine sliding core mechanism and the first left end cover 4 are installed in place, the first protrusion 8-1 of the first fine-hole sliding sleeve 8 is sandwiched between the first left end cover 4 and the first valve sleeve 2, and is located at the first oil inlet chamber 12. Since the end of the first fine-hole sliding sleeve 8 that is embedded in the first left end cover 4 is provided with a second radial groove 8-2, and the first left end cover 4 is provided with a first radial hole 4-1 near the end face of the first protrusion 8-1, the oil in the first oil inlet chamber 12 enters the left end of the first fine sliding core 9 through the first radial hole 4-1, the radial gap where the first fine-hole sliding sleeve 8 is embedded in the first left end cover 4, the second radial groove 8-2, and the central through hole of the left throttling screw plug 6, so as to push the first fine sliding core 9 to move to the right.

[0032] The first coarse lubricating core mechanism includes a first coarse-hole sliding sleeve 10, a first coarse lubricating core 11, and a right throttling screw plug 7.

[0033] like Figure 6 As shown, the first coarse-hole sliding sleeve 10 has a stepped cylindrical structure with a central through hole along its axis, forming a first coarse-hole sliding sleeve slide track 10-6. The slide track 10-6 is used to slide and install the first coarse sliding core 11. A radial second protrusion 10-1 is provided at the middle of the outer diameter of the first coarse-hole sliding sleeve 10. Inside the second protrusion 10-1 is a first coarse-hole sliding sleeve mating shaft 10-3, which is used to embed into the right end of the central inner hole of the first valve sleeve 2 and fit tightly therewith. Outside the second protrusion 10-1 is a first coarse-hole sliding sleeve flow shaft 10-7, which is used to embed into the central hole 5-2 of the first right end cover 5 and fit with it with a clearance. The outer diameter of the mating shaft 10-3 is provided with a first coarse-hole sliding sleeve sealing groove 10-5, which is used to install a sealing ring to achieve a seal between the mating shaft 10-3 and the first valve sleeve 2. A first coarse-hole sliding sleeve with an internal threaded hole 10-8 is provided at the center of the outer end face of the flow shaft 10-7. The internal threaded hole 10-8 and the slide rail 10-6 are coaxial, and the internal threaded hole 10-8 is used to install the right throttle plug 7. The first coarse-hole sliding sleeve 10 has a fourth radial groove 10-2 on the end face of the right throttle plug 7 mounting end for oil passage. The first coarse-hole sliding sleeve 10 has a first coarse-hole sliding sleeve end face groove 10-4 on the inner end face of the first valve sleeve 2, and the end face groove 10-4 is arranged radially.

[0034] like Figure 4 As shown, the first coarse sliding core 11-step rod structure, its main rod outer diameter is... Figure 4 The first coarse sliding core has a sliding outer diameter of 11-1, which slides within the inner wall of the first coarse-hole sliding sleeve 10-6. The sliding clearance between the first coarse sliding core 11 and the first coarse-hole sliding sleeve 10 is within 0.01 mm. The main body of the first coarse sliding core 11 has four evenly distributed pressure-equalizing grooves 11-4, which are used to balance radial pressure and prevent sliding jamming. The inner side of the first coarse sliding core 11 is the first coarse sliding core push rod portion 11-2, which transitions to the main body of the first coarse sliding core 11 with a tapered surface, forming the first coarse sliding core transition portion 11-3. The end of the push rod portion 11-2 facing away from the transition portion 11-3 has an arc-shaped structure, forming the first coarse sliding core push head 11-5. During operation, the first coarse sliding core push head 11-5 contacts the right end face of the first valve core 3. In this embodiment, the sliding outer diameter of the first coarse sliding core 11 is 2.8 mm.

[0035] The right throttling plug 7 and the left throttling plug 6 have the same structure. The outer diameter of the right throttling plug 7 is provided with external threads to achieve screw connection with the internal threaded hole 10-8 of the first coarse hole sliding sleeve 10. The right throttling plug 7 is provided with a through hole along the axis for oil passage.

[0036] like Figure 2 and Figure 9As shown, the inner side of the first right end cover 5 is embedded in the first housing 1, and its outer side forms a radially protruding end cover that blocks the right end face of the first housing 1. A first right end cover sealing ring groove 5-3 is provided at the outer diameter of the first right end cover 5 embedded in the first housing 1. The sealing ring groove 5-3 is used to insert a sealing ring 18 to achieve a sealed connection between the two. A recessed first right end cover center hole 5-2 is provided at the center of the inner end of the first right end cover 5. The center hole 5-2 is used for clearance fitting with the flow shaft 10-7 of the first coarse-hole sliding sleeve 10. A radially arranged third radial hole 5-1 is provided on the inner side of the first right end cover 5 near the inner end face. The third radial hole 5-1 connects to the center hole 5-2 and is used for oil passage. The outer side of the first right end cover 5 is a radially protruding first right end cover outer end protrusion 5-4. The outer end protrusion 5-4 has four first right end cover mounting holes 5-5. The mounting holes 5-5 are used to insert fasteners to achieve a fixed connection between the first right end cover 5 and the first housing 1.

[0037] like Figure 2 As shown, after the first coarse sliding core mechanism and the first right end cover 5 are installed in place, the second protrusion 10-1 of the first coarse hole sliding sleeve 10 is sandwiched between the first right end cover 5 and the first valve sleeve 2, and is located at the first control cavity 17. The flow shaft 10-7 of the first coarse hole sliding sleeve 10 is embedded in the center hole 5-2 of the first right end cover and is clearance-fitted with it. Since the end of the first coarse hole sliding sleeve 10 embedded in the first right end cover 5 is provided with a fourth radial groove 10-2, and the contact surface between the first right end cover 5 and the second protrusion 10-1 is provided with a third radial hole 5-1, the oil in the first control cavity 17 enters the right end of the first coarse sliding core 11 through the third radial hole 5-1, the radial gap at the first coarse hole sliding sleeve 10 embedded in the first right end cover 5 (i.e., the radial gap at the flow shaft 10-7), the fourth radial groove 10-2 and the center through hole of the right throttling screw plug 7, thus realizing the pushing of the first coarse sliding core 11 to the left.

[0038] like Figure 7 As shown, the first valve sleeve 2 is a hollow cylindrical structure, coaxially mounted within the inner cavity of the first housing 1. The first valve sleeve 2 has a through central inner hole along its axis. The central inner hole is a stepped hole, with the diameters at both ends larger than those in the middle. Figure 7 The stepped hole at the left end of the central inner hole is used to embed and install the first fine-hole sliding sleeve 8. This end forms the fine-hole sliding sleeve sealing surface 2-1 of the first valve sleeve. The sealing surface 2-1 and the first fine-hole sliding sleeve mating shaft 8-3 are sealed and fitted. The middle small-diameter section forms the valve core slide 2-2 of the first valve sleeve. The first valve core 3 is slidably installed in the valve core slide 2-2 of the first valve sleeve. The two are slidably fitted. The stepped hole at the right end of the central inner hole is used to embed and install the first coarse-hole sliding sleeve 10. The inner wall of the stepped hole at the right end forms the coarse-hole sliding sleeve sealing surface 2-3 of the first valve sleeve. The sealing surface 2-3 is used to seal and fit with the first coarse-hole sliding sleeve mating shaft 10-3.

[0039] Meanwhile, the outer diameter of the first valve sleeve 2 is provided with multiple annular inner grooves forming oil chambers, which, from left to right, are the first valve sleeve first return oil chamber 2-6, the first valve sleeve second inlet oil chamber 2-7, the first valve sleeve working chamber 2-8, the first valve sleeve second return oil chamber 2-9, and the first valve sleeve control chamber 2-10 formed at the rightmost end. Each oil chamber on the outer diameter of the first valve sleeve 2 corresponds to the concave oil chamber provided in the inner cavity of the first housing 1, together forming the first return oil chamber 14, the second inlet oil chamber 13, the first working chamber 16, the second return oil chamber 15, and the first control chamber 17. Among them, the first return oil chamber 2-6 and the first return oil chamber 14 correspond to each other, the second inlet oil chamber 2-7 and the second inlet oil chamber 13 correspond to each other, the first working chamber 2-8 and the first working chamber 16 correspond to each other, the second return oil chamber 2-9 and the second return oil chamber 15 correspond to each other, and the end first valve sleeve control chamber 2-10 and the first control chamber 17 correspond to each other. The first oil inlet chamber 12 and the radial first protrusion 8-1 of the first fine-hole sliding sleeve 8 correspond to each other. A first valve sleeve sealing ring groove 2-5 is provided between two adjacent oil chambers of the first valve sleeve 2. The sealing ring groove 2-5 is used to install the first sealing ring 18. The first sealing ring 18 seals the gap between the first valve sleeve 2 and the first housing 1, realizing hydraulic isolation between adjacent chambers. In this embodiment, the main structure of the inner cavity of the first housing 1 is a hole of equal diameter, and multiple annular grooves are provided on the hole wall to form concave oil cavities in the inner cavity of the first housing 1.

[0040] The first valve sleeve 2 has four first valve sleeve oil return through holes 2-4 radially, which are connected to the first valve sleeve first oil return chamber 2-6. The four first valve sleeve oil return through holes 2-4 are arranged in a cross shape. The first valve sleeve second oil inlet chamber 2-7 is provided with a cross-shaped oil hole that is connected to the first valve sleeve valve core slide 2-2. The first valve sleeve working chamber 2-8 is provided with a cross-shaped oil hole that is connected to the first valve sleeve valve core slide 2-2. The first valve sleeve second oil return chamber 2-9 is provided with a cross-shaped oil hole that is connected to the intersection of the first valve sleeve valve core slide 2-2 and the step hole at the right end of the first valve sleeve 2.

[0041] like Figure 2 As shown, the first valve core 3 is a solid stepped shaft, which is slidably installed in the slide 2-2 of the first valve sleeve 2. The outer diameter of the first valve core 3 has a radially protruding third protrusion 3-1 and a fourth protrusion 3-2, which form a first recess 3-3 between them. The outer side of the fourth protrusion 3-2 away from the third protrusion 3-1 forms a second recess 3-4. When the first valve core 3 is located at the leftmost end, it connects the second return oil chamber 15 and the first working chamber 16 through the second recess 3-4; when the first valve core 3 is located at the rightmost end, it connects the second inlet oil chamber 13 and the first working chamber 16 through the first recess 3-3. The first working chamber 16 is the brake chamber, which is used to output hydraulic medium through the brake port to achieve braking. The outer diameter walls of the third protrusion 3-1 and the fourth protrusion 3-2 are provided with multiple pressure equalizing grooves to avoid sliding jamming.

[0042] Working principle: The first control chamber 17 has two states, which are controlled by the on / off state of the solenoid valve. When the solenoid valve is de-energized, the first control chamber 17 is connected to the oil inlet, and the first valve core 3 moves to the left (e.g., Figure 2 (As shown); when the solenoid valve is energized, the first control chamber 17 is connected to the return oil, the first valve core 3 moves to the right side, and the first working chamber 16 is connected to the inlet oil, thus realizing the braking function.

[0043] When the first control chamber 17 is connected to the return oil, the hydraulic pressure on the right side of the first coarse lubricating core 11 is approximately F. 粗 =P 回 ×A 粗 The hydraulic pressure on the left side of the first fine slipper core 9 is F. 细 =P 进 ×A 细 Because the return oil pressure is much lower than the inlet oil pressure, therefore, F 粗 Less than F 细 Then, the first fine lubricating core 9 moves to the right, pushing the first valve core 3 and the first coarse lubricating core 11 to the right until they reach the stopping point, where the first coarse lubricating core 11 contacts the right throttling plug 7. When the first control chamber 17 is connected to the oil inlet, the hydraulic pressure on the right side of the first coarse lubricating core 11 is F. 粗 =P 进 ×A 粗 The hydraulic pressure on the left side of the first fine slipper core 9 is F. 细 =P 进 ×A 细 Because A 粗 Greater than A 细 Therefore, F 粗 Greater than F 细 The first coarse sliding core 11 pushes the first valve core 3 and the first fine sliding core 9 to move to the left until they reach the stop, at which point the first fine sliding core 9 contacts the left throttling plug 6. Wherein, P 进 P is the inlet oil pressure; 回 For return oil pressure; A 粗 A is the end face area of ​​the first coarse core 11; 细 This represents the end face area of ​​the fine slip core.

[0044] This solution can reduce the operating noise of the slide valve to below 50dB.

[0045] Example 2 This embodiment provides another slide valve device, such as... Figure 10 As shown, it includes a second housing 20, a second valve sleeve 21, a second valve core 22, a second left end cover 23, a second right end cover 24, a second fine slip core mechanism, and a second coarse slip core mechanism.

[0046] The second housing 20 serves as the support housing for the spool valve. It is a hollow cylindrical structure with open ends and multiple independent oil chambers inside. The second housing 20 is equipped with an oil inlet, an oil return port, and a brake port. The oil inlet is connected to the oil inlet circuit on the outside and to the oil inlet chamber of the spool valve on the inside. The oil return port is connected to the oil return circuit on the outside and to the oil return chamber of the spool valve on the inside. The brake port is connected to the brake control circuit on the outside and to the working chamber of the spool valve on the inside.

[0047] The second valve sleeve 21 is coaxially fixedly installed inside the second housing 20, the second valve core 22 is coaxially slidably installed inside the second valve sleeve 21, the second left end cover 23 is installed on the left end of the second valve sleeve 21, the second right end cover 24 is installed on the right end of the second valve sleeve 21, and both the second left end cover 23 and the second right end cover 24 are fixedly connected to the second housing 20.

[0048] The second valve core 22 has return oil chambers at both ends. A second fine sliding core mechanism is located at the end of the second valve core 22 facing the second left end cover 23, and a second coarse sliding core mechanism is located at the end of the second valve core 22 facing the second right end cover 24. The second fine sliding core mechanism connects to the inlet oil chamber, and the second coarse sliding core mechanism connects to the control chamber. The second fine sliding core mechanism pushes the second valve core 22 towards the second coarse sliding core mechanism, and the second coarse sliding core mechanism pushes the second valve core 22 towards the second fine sliding core mechanism. The movement of the second valve core 22 controls the connection between the working chamber and the inlet oil chamber or between the working chamber and the return oil chamber, thereby controlling the brake.

[0049] The return oil chamber, inlet oil chamber, control chamber, and working chamber are independent cavity structures formed between the second fine sliding core mechanism, the second valve sleeve 21, the second coarse sliding core mechanism, the second left end cover 23, and the second right end cover 24 after they are installed on the second housing 20. The return oil chamber is connected to the return oil port on the second housing 20, the inlet oil chamber is connected to the inlet oil port on the second housing 20, the working chamber is connected to the brake port on the second housing 20, and the control chamber is connected to the solenoid valve outside the slide valve device. The solenoid valve controls the control chamber to connect the inlet oil or the return oil.

[0050] In this embodiment, from the left end where the second fine lubricating core mechanism is located to the right end where the second coarse lubricating core mechanism is located, a third oil inlet chamber 29, a second working chamber 30, a third oil return chamber 31, and a second control chamber 32 are sequentially formed within the second housing 20. The third oil inlet chamber 29 is connected to the oil inlet of the second housing 20, the second working chamber 30 is connected to the brake port of the second housing 20, the third oil return chamber 31 is connected to the oil return port of the second housing 20, and the second control chamber 32 is connected to the oil circuit controlled by the solenoid valve. By controlling the solenoid valve to turn on and off, the second control chamber 32 can be connected to the oil inlet or the oil return. The third oil inlet chamber 29, the second working chamber 30, the third oil return chamber 31, and the second control chamber 32 are independent of each other, and hydraulic isolation between adjacent chambers is achieved by multiple third sealing rings 33.

[0051] Specifically, the second fine slip core mechanism includes a second fine-hole sliding sleeve 25 and a second fine slip core 26, such as... Figure 10 , Figure 13 As shown, the second fine-hole sliding sleeve 25 is a cylindrical structure with a through hole along its central axis, serving as a slide channel 25-2 for sliding the second fine-hole sliding core 26. One end of the second fine-hole sliding sleeve 25 is embedded in the left end of the central inner hole of the second valve sleeve 21, and the other end is embedded in the inner hole 23-1 of the second left end cover 23. The second fine-hole sliding sleeve 25 and the second valve sleeve 21 are tightly fitted together, and the seal between them is achieved by a fourth sealing ring 34 installed on the outer diameter of the second fine-hole sliding sleeve 25. The second fine-hole sliding sleeve 25 and the inner hole 23-1 of the second left end cover 23 are clearance-fitted. A fifth radial groove 25-1 is provided on the end face of the second fine-hole sliding sleeve 25 embedded in the second left end cover 23. The fifth radial groove 25-1 is arranged radially and connects to the slide channel 25-2 of the second fine-hole sliding sleeve 25 to facilitate oil passage.

[0052] The second fine slip core 26 structure is as follows Figure 11 As shown, the second fine sliding core 26 is cylindrical, with a second fine sliding tail groove 26-3 at its outer end (the end facing the second left end cap 23) for easy installation; its inner end has an arc-shaped structure, forming a second fine sliding core pusher 26-2, which is used to contact the left end face of the second valve core 22 during operation. Three second fine sliding core equalizing grooves 26-1 are provided on the outer diameter of the second fine sliding core 26 near the tail groove 26-3. These grooves are used to balance radial pressure and prevent sliding jamming. In this embodiment, the diameter of the second fine sliding core 26 is 3mm.

[0053] like Figure 10 and Figure 15 As shown, the inner end of the second left end cover 23 is embedded in the left end of the inner cavity of the second housing 20. The outer end of the second left end cover 23 forms a flange structure that blocks the outer end of the second housing 20. The outer diameter of the inner end of the second left end cover 23 is provided with a second left end cover external thread 23-2, which is used for threaded connection and fixation with the second housing 20. A second left end cover sealing ring groove 23-3 is formed between the external thread 23-2 of the second left end cover 23 and its outer end flange structure. The sealing ring groove 23-3 is used to install a sealing ring to achieve a seal between the second left end cover 23 and the second housing 20. The inner side of the second left end cover 23 is provided with a concave inner hole 23-2 along the axis. The inner hole 23-2 is used for clearance fit installation with the second fine hole sliding sleeve 25. The outer side of the second left end cover 23 is provided with a second left end cover hexagonal hole 23-5 for installation of the second left end cover 23.

[0054] like Figure 10As shown, after the second fine sliding core mechanism and the second left end cover 23 are installed in place, the axial gap between the second left end cover 23 and the second valve sleeve 21 corresponds to the location of the third oil inlet chamber 29. The oil in the third oil inlet chamber 29 passes through the gap between the second left end cover 23 and the second valve sleeve 21, the radial gap between the second fine hole sliding sleeve 25 and the inner hole 23-1 of the second left end cover 23, and the fifth radial groove 25-1 on the end face of the second fine hole sliding sleeve 25 enters the left end of the second fine sliding core 26, so as to push the second fine sliding core 26 to move to the right.

[0055] The second coarse sliding core mechanism includes a second coarse-hole sliding sleeve 27 and a second coarse sliding core 28.

[0056] like Figure 10 and Figure 16 As shown, the second coarse-hole sliding sleeve 27 is a hollow cylindrical structure, which is embedded in the right end of the central inner hole of the second valve sleeve 21. The second coarse-hole sliding sleeve 27 has a through hole along its axis at its center, forming a slide channel 27-1. The slide channel 27-1 is used to slide and install the second coarse-hole sliding core 28. The outer diameter of the second coarse-hole sliding sleeve 27 has a sealing groove 27-2, which is used to install a fifth sealing ring 35 to achieve a seal between the second coarse-hole sliding sleeve 27 and the second valve sleeve 21.

[0057] like Figure 12 As shown, the second coarse sliding core 28 is cylindrical, with a tail groove 28-3 at its outer end (facing the second right end cap 24) for easy installation; its inner end has an arc-shaped structure, forming a pusher head 28-2, which contacts the right end face of the second valve core 22 during operation. Three pressure equalizing grooves 28-1 are provided on the outer diameter wall of the middle part of the second coarse sliding core 28. These grooves balance radial pressure and prevent slippage. In this embodiment, the diameter of the second coarse sliding core 28 is 4mm.

[0058] like Figure 10 and Figure 16 As shown, the second right end cap 24 is embedded in the right end of the inner cavity of the second housing 20. Its outer diameter is provided with a second right end cap external thread 24-5, which is used for threaded connection and fixation with the second housing 20. The outer end of the external thread 24-5 is provided with a second right end cap sealing ring groove 24-3, which is used to install a sealing ring to achieve a seal between the second housing 20 and the second right end cap 24. The inner end face of the second right end cap 24 is provided with a second right end cap inner hole 24-7, which is used to mate with the second coarse sliding core 28, allowing the second coarse sliding core 28 to be inserted into the inner hole 24-7 when it moves to the right. The inner end face of the second right end cap 24 is provided with a second right end cap inner groove 24-8, which is radially arranged and passes through the inner hole 24-7. The second right end cap inner groove 24-8 is used to connect the second control cavity 32 and the right end of the second coarse sliding core 28.

[0059] like Figure 10 As shown, after the second coarse lubricating core mechanism and the second right end cover 24 are installed in place, the axial gap between the second right end cover 24 and the second valve sleeve 21 corresponds to the location of the second control cavity 32. In this embodiment, the inner end face of the second right end cover 24 abuts against the right end face of the second valve sleeve 21, and the axial gap between the second right end cover 24 and the second valve sleeve 21 is a radial groove provided on the end face of the second right end cover 24, that is... Figure 16 The second right end cover has an inner end groove 24-8. The oil in the second control chamber 32 enters the right end face (i.e. the end face facing the second right end cover 24) of the second coarse lubricating core 28 through the inner end groove 24-8 of the second right end cover, so as to push the second coarse lubricating core 28 to move to the left.

[0060] like Figure 17 As shown, the second valve sleeve 21 has a hollow cylindrical structure and is coaxially mounted in the inner cavity of the second housing 20. The second valve sleeve 21 has a through central inner hole along its axis. The central inner hole is a stepped hole; the left end hole is the fine-hole sliding sleeve mounting hole 21-4 for mounting the second fine-hole sliding sleeve 25; the right end hole is the coarse-hole sliding sleeve mounting hole 21-6 for mounting the second coarse-hole sliding sleeve 27; and the middle hole is the valve core mounting hole 21-5 for slidingly mounting the second valve core 22. The fine-hole sliding sleeve mounting hole 21-4 of the second valve sleeve has a recessed sealing groove for mounting the fourth sealing ring 34.

[0061] The outer diameter of the second valve sleeve 21 has multiple annular inner grooves forming oil chambers, which, from left to right, are the second valve sleeve inlet oil chamber 21-7, the second valve sleeve working chamber 21-8, and the second valve sleeve return oil chamber 21-9. The rightmost end of the second valve sleeve 21 has an annular radially protruding stop end 21-1. The stop end 21-1 cooperates with the step in the inner cavity of the second housing 20 to form an axial limit, and the stop end 21-1 corresponds to the location of the second control cavity 32. Each oil chamber on the outer diameter of the second valve sleeve 21 corresponds to the concave oil chamber in the inner cavity of the second housing 20, together forming the third inlet oil chamber 29, the second working chamber 30, the third return oil chamber 31, and the second control cavity 32. Among them, the second valve sleeve inlet oil chamber 21-7 corresponds to the third inlet oil chamber 29, the second valve sleeve working chamber 21-8 corresponds to the second working chamber 30, the second valve sleeve return oil chamber 21-9 corresponds to the third return oil chamber 31, and the stop end 21-1 corresponds to the second control cavity 32. The second valve sleeve 21 is provided with a second valve sleeve sealing ring groove 21-3 between two adjacent oil chambers. The sealing ring groove 21-3 is used to install the third sealing ring 33. The third sealing ring 33 seals the gap between the second valve sleeve 21 and the second housing 20, thereby realizing hydraulic isolation between adjacent chambers.

[0062] The second valve sleeve has an oil hole at the oil inlet chamber 21-7 that connects to the valve core mounting hole 21-5. The second valve sleeve has an oil hole at the working chamber 21-8 that connects to the valve core mounting hole 21-5. The second valve sleeve has an oil hole at the oil return chamber 21-9 that connects to the intersection of the valve core mounting hole 21-5 and the coarse hole sliding sleeve mounting hole 21-6 of the second valve sleeve.

[0063] like Figure 10 As shown, the second valve core 22 is a stepped shaft with a through hole along its axis. Its outer diameter has a radially protruding fifth protrusion 22-2 and a sixth protrusion 22-3, forming a third recess 22-4 between them. The sixth protrusion 22-3 forms a fourth recess 22-5 on its outer side away from the fifth protrusion 22-2. When the second valve core 22 is at its leftmost position, it connects to the third return oil chamber 31 and the second working chamber 30 through the fourth recess 22-5 and the radial gap between the second coarse lubricating core 28 and the second valve sleeve 21. When the second valve core 22 is at its rightmost position, it connects to the third inlet oil chamber 29 and the second working chamber 30 through the third recess 22-4. The outer diameters of both the fifth protrusion 22-2 and the sixth protrusion 22-3 are provided with pressure equalizing grooves to prevent sliding jamming. The third oil return chamber 31 is connected to both ends of the second valve core 22 through the through hole 22-1 in the center of the second valve core 22 to realize oil return. That is, the oil that seeps between the second fine lubricating core 26 and the second valve core 22 is connected to the oil return chamber to realize the oil return at the left end of the second valve core 22.

[0064] Working principle: The second control chamber 32 has two states, which are controlled by the on / off state of the solenoid valve. When the solenoid valve is de-energized, the second control chamber 32 is connected to the oil inlet, and the second valve core 22 moves to the left (e.g., Figure 10 (As shown); when the solenoid valve is energized, the second control chamber 32 is connected to the return oil, the second valve core 22 moves to the right side, and at this time the third oil inlet chamber 29 is connected to the second working chamber 30 to realize the braking function.

[0065] When the second control chamber 32 is connected to the return oil, the hydraulic pressure on the right side of the second valve core 22 is approximately F'. 粗 =P 回 ×A' 粗 The hydraulic pressure on the left side of the second fine slipper 26 is F' 细 =P 进 ×A' 细 Because the return oil pressure is much lower than the inlet oil pressure, therefore, F' 粗 Less than F' 细 Then, the second valve core 22 moves to the right, pushing the second valve core 22 and the second coarse lubricating core 28 to the right until they reach the stop end, that is, the second coarse lubricating core 28 and the second right end cover 24 come into contact. When the second control chamber 32 is connected to the oil inlet, the hydraulic pressure on the right side of the second coarse lubricating core 28 is F'. 粗 =P 进×A' 粗 The hydraulic pressure on the left side of the second fine slipper 26 is F' 细 =P 进 ×A' 细 , because A' 粗 Greater than A' 细 Therefore, F' 粗 Greater than F' 细 The second coarse sliding core 28 pushes the second valve core 22 and the second fine sliding core 26 to move to the left until they reach the stop end, where the second fine sliding core 26 and the second left end cap 23 come into contact. Wherein, P 进 P is the inlet oil pressure; 回 The return oil pressure; A' 粗 A' is the end face area of ​​the second coarse core 28. 细 This is the end face area of ​​the second fine slip core 26.

[0066] This solution can reduce the operating noise of the slide valve to below 50dB.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A spool valve device, comprising a housing, a valve sleeve, a valve core, a left end cap, and a right end cap, wherein the valve sleeve is fixedly installed within the housing, the valve core is slidably installed within the valve sleeve, and the left and right end caps are respectively installed at both ends of the valve sleeve and are both fixedly connected to the housing; characterized in that: Both ends of the valve core are provided with oil return chambers. The valve core has a fine sliding core mechanism on the left end facing the end cover and a coarse sliding core mechanism on the right end facing the end cover. The fine sliding core mechanism is connected to the oil inlet chamber, and the coarse sliding core mechanism is connected to the control chamber. The fine sliding core mechanism is used to push the valve core to move towards the coarse sliding core mechanism, and the coarse sliding core mechanism is used to push the valve core to move towards the fine sliding core mechanism. The movement of the valve core is used to control the connection between the working chamber and the oil inlet chamber or the working chamber and the oil return chamber. The return oil chamber, inlet oil chamber, control chamber, and working chamber are independent cavity structures formed by the fine sliding core mechanism, valve sleeve, coarse sliding core mechanism, left end cover, and right end cover after they are installed in the housing. The return oil chamber is connected to the return oil port on the housing, the inlet oil chamber is connected to the inlet oil port on the housing, the working chamber is connected to the brake port on the housing, and the control chamber is connected to the solenoid valve outside the slide valve device. The solenoid valve controls the control chamber to connect the inlet oil or the return oil.

2. The slide valve device according to claim 1, characterized in that, The fine sliding core mechanism includes a fine sliding core and a fine-hole sliding sleeve. The fine sliding core is coaxially and slidably installed in the through hole of the fine-hole sliding sleeve. One end of the valve sleeve is embedded in the inner side of the fine-hole sliding sleeve and is tightly fitted thereto. The left end cover is embedded in the outer side of the fine-hole sliding sleeve and is clearance fitted thereto. The oil in the oil inlet chamber is connected to the end of the fine sliding core facing the left end cover.

3. The slide valve device according to claim 2, characterized in that, The coarse lubricating core mechanism includes a coarse lubricating core and a coarse-hole sliding sleeve. The coarse lubricating core is coaxially and slidably installed in the through hole of the coarse-hole sliding sleeve. One end of the valve sleeve is embedded in the inner side of the coarse-hole sliding sleeve and fits tightly with it. The oil in the control chamber is connected to the end of the coarse lubricating core facing the right end cap.

4. The slide valve device according to claim 3, characterized in that, The gaps between the fine sliding core and the fine-hole sliding sleeve, and between the coarse sliding core and the coarse-hole sliding sleeve, are all within 0.01 mm.

5. The slide valve device according to claim 3, characterized in that, Both the fine and coarse sliding cores have pressure equalization grooves on their outer diameter walls. These grooves are used to balance radial pressure and prevent slippage.

6. The slide valve device according to claim 3, characterized in that, The fine sliding core mechanism and the coarse sliding core mechanism also include a throttling screw plug. A left throttling screw plug is fixedly installed on the end of the fine-hole sliding sleeve away from the valve core in the fine sliding core mechanism. A right throttling screw plug is fixedly installed on the end of the coarse-hole sliding sleeve away from the valve core in the coarse sliding core mechanism. The left throttling screw plug and the right throttling screw plug have the same structure. The throttling screw plug has a through hole along the central axis. The fine-hole sliding sleeve has a stepped cylindrical structure with a radial first protrusion in its middle. The first protrusion is sandwiched between the left end cover and the valve sleeve and is located at the oil inlet cavity. The end of the fine-hole sliding sleeve that is embedded in the left end cover has a second radial groove. The contact surface between the left end cover and the first protrusion has a first radial hole. The oil in the oil inlet cavity enters the fine sliding core facing the left end cover through the first radial hole, the radial gap where the fine-hole sliding sleeve is embedded in the left end cover, the second radial groove, and the through hole of the left throttling screw. The coarse-hole sliding sleeve has a stepped cylindrical structure with a second radial protrusion in its middle. The second protrusion is sandwiched between the right end cover and the valve sleeve and is located at the control cavity. The outer side of the coarse-hole sliding sleeve is embedded in the right end cover and has a clearance fit with it. The end of the coarse-hole sliding sleeve embedded in the right end cover has a fourth radial groove. The contact surface between the right end cover and the second protrusion has a third radial hole. The oil in the control cavity enters the coarse sliding core facing the right end cover through the third radial hole, the radial clearance where the coarse-hole sliding sleeve is embedded in the right end cover, the fourth radial groove, and the through hole of the right throttling screw plug.

7. The slide valve device according to claim 6, characterized in that, The valve core is a solid stepped shaft with a radially protruding third protrusion and a fourth protrusion on its outer diameter, forming a first recess between them. A second recess is formed on the outer side of the fourth protrusion away from the third protrusion. The housing contains a first oil inlet chamber, a second oil inlet chamber, a first oil return chamber, a second oil return chamber, a first working chamber, and a first control chamber. The first oil inlet chamber and the second oil inlet chamber are connected and connected to the oil inlet of the housing. The first oil return chamber and the second oil return chamber are connected and connected to the oil return port. The first working chamber is connected to the brake port. The first control chamber is connected to the oil circuit controlled by the solenoid valve. When the valve core is at the leftmost end, the second return oil chamber and the first working chamber are connected through the second recess; when the valve core is at the rightmost end, the second inlet oil chamber and the first working chamber are connected through the first recess.

8. The slide valve device according to claim 3, characterized in that, Both the fine-hole sliding sleeve and the coarse-hole sliding sleeve are cylindrical structures. The end face of the fine-hole sliding sleeve embedded in the left end cover is provided with a fifth radial groove, and a first axial gap is provided between the left end cover and the valve sleeve. The first axial gap is located at the oil inlet chamber. The oil in the oil inlet chamber enters the fine sliding core facing the left end cover through the first axial gap, the radial gap where the fine-hole sliding sleeve is embedded in the left end cover, and the fifth radial groove. The coarse-hole sliding sleeve is embedded in the valve sleeve, and its outer end is flush with the valve sleeve. A second axial gap is provided between the valve sleeve and the right end cover. The second axial gap is located in the control chamber. The oil in the control chamber enters the coarse sliding core facing the right end cover through the second axial gap.

9. The slide valve device according to claim 8, characterized in that, The valve core is a stepped shaft with a through hole along the axis. Its outer diameter has a fifth protrusion and a sixth protrusion that are radially protruding. A third recess is formed between the two. A fourth recess is formed on the outer side of the sixth protrusion away from the fifth protrusion. A third oil inlet chamber, a second working chamber, a third oil return chamber, and a second control chamber are formed inside the housing. The third oil inlet chamber is connected to the oil inlet port, the third oil return chamber is connected to the oil return port, the second working chamber is connected to the brake port, and the second control chamber is connected to the oil circuit controlled by the solenoid valve. When the valve core is at the leftmost end, the third return oil chamber and the second working chamber are connected through the fourth recess and the radial gap between the coarse sliding core and the valve sleeve; when the valve core is at the rightmost end, the third inlet oil chamber and the second working chamber are connected through the third recess. The third return oil chamber is connected to both ends of the valve core through a through hole in the center of the valve core, and is used to connect the return oil chamber.

10. The slide valve device according to claim 1, characterized in that, The outer diameter of the valve sleeve is provided with multiple sealing ring grooves for installing sealing rings, which achieve hydraulic isolation between adjacent cavities.

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