Plug-in hydraulic control change-over valve with cut-off function

Abstract

The application relates to the technical field of hydraulic transmission, in particular to a plug-in type hydraulic control switching valve with a cutoff function, which comprises a valve body, a main valve core, a valve sleeve, a one-way valve seat, a valve ball, a control valve core, a main spring, a plug and a stop ring, an A port and a B port are arranged on the valve body, a first boss is arranged on the inner wall of the valve body close to the B port, a central through hole is arranged in the main valve core, a conical surface is arranged at one end of the main valve core, an annular groove is formed in the outer wall of the main valve core, the main valve core is arranged in the valve body, the conical surface abuts against the first boss, the plug is connected to the first end of the valve body, the conical surface is located between the plug and the first boss, one end of the main spring is connected to the inner wall of the plug, the other end of the main spring is connected to the end of the main valve core with the conical surface, and the A port is located between the plug and the conical surface. The application ensures reliable isolation of two cavities communicated with the A port and the B port.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic transmission, in particular to a plug-in type hydraulic control switching valve with a cutoff function. BACKGROUND

[0002] With the development of electric drive vehicle technology, new requirements for miniaturization and light weight of the electro-hydraulic steering system and components of multi-axle heavy special vehicles are proposed.

[0003] The steering hydraulic system has two working modes: steering mode and locking mode, which can be converted to each other. In the steering mode, the two cavities of the assist oil cylinder A and B need to be isolated from each other to realize the steering hydraulic assist. In the locking mode, the alignment force is provided by the alignment cylinder to align the wheels, at this time the two cavities of the assist oil cylinder A and B need to be connected and connected with the oil return line to completely unload them to reduce the alignment resistance.

[0004] The existing system uses two plate type one-way hydraulic locks or two electromagnetic reversing valves to realize the above functions, which has the problems of large valve size, cannot meet the requirements of miniaturization and light weight, etc. The electromagnetic reversing valve also increases the electrical control points of the system, and the electromagnetic reversing valve has the possibility of valve core sticking, and the system reliability is poor.

[0005] In order to reduce the volume and weight of the steering hydraulic system, a plug-in type hydraulic control switching valve with a cutoff function needs to be developed. SUMMARY

[0006] The problem solved by the present application is to provide a plug-in type hydraulic control switching valve with a cutoff function that does not connect A and B ports regardless of the pressure of A and B ports, and ensures reliable isolation of the two cavities connected with A and B ports.

[0007] To solve the above problems, the present application provides a plug-in type hydraulic control switching valve with a cutoff function, comprising a valve body, a main valve core, a main spring, a plug,

[0008] An A port and a B port are provided on the valve body, and a first boss is provided on the inner wall of the valve body close to the B port,

[0009] The main valve core is provided with a center through hole extending along the length direction of the main valve core, one end of the main valve core is provided with a tapered surface, an annular groove is formed on the outer wall of the main valve core near the tapered surface, the main valve core is arranged in the valve body, the outer wall of the middle part of the main valve core is matched with the inner wall of the valve body, the position of the annular groove corresponds to the position of the B port, the tapered surface abuts against the first boss, the plug is connected to the first end of the valve body, the tapered surface is located between the plug and the first boss, one end of the main spring is connected to the inner wall of the plug, the other end of the main spring is connected to the end of the main valve core with the tapered surface, and the A port is located between the plug and the tapered surface.

[0010] Further, a spring mounting boss is arranged on the end surface of the tapered surface corresponding to the plug, and one end of the main spring connected with the tapered surface is sleeved on the spring mounting boss.

[0011] Further, the valve sleeve, the one-way valve seat, the valve ball, the control valve core and the one-way valve spring are further included, the O port is arranged on the valve sleeve, the second annular boss is arranged on the inner wall of the valve sleeve, the second annular boss is arranged near the O port, the other end of the valve body corresponding to the plug is a second end, the valve sleeve is connected to the second end of the valve body, the one-way valve seat is arranged in the valve sleeve, the one-way valve seat is arranged between the other end of the main valve core corresponding to the tapered surface and the second annular boss, the recess is formed on the one-way valve seat, the valve ball is arranged in the recess, the outer wall of the one-way valve seat protrudes out of the outer wall of the main valve core, and a gap is left between the outer wall of the one-way valve seat and the inner wall of the valve sleeve, the valve ball is adapted to abut against the second annular boss, a containing space is left between the other end of the main valve core corresponding to the tapered surface and the inner wall of the valve body, the radial through hole is arranged on the main valve core and communicates with the containing space, the one-way valve spring is sleeved on the main valve core and located in the containing space, and the one-way valve spring is connected between the one-way valve seat and the valve body at two ends respectively, the control valve core includes the abutting end and the moving end connected with each other, the outer diameter of the abutting end is smaller than the inner diameter of the valve sleeve, the control valve core is arranged in the valve sleeve, the abutting end is arranged near the valve ball, and the moving end is matched with the inner wall of the valve sleeve, the abutting end is used for pushing the one-way valve seat to move leftwards through the valve ball, so that the main valve core moves leftwards, and the end of the control valve core away from the valve ball is the K port.

[0012] Further, the valve sleeve is threadedly connected to the inner wall of the valve body.

[0013] Further, the outer wall of the valve sleeve is provided with a third annular boss, and the valve body abuts against the third annular boss.

[0014] Further, an end of the one-way valve seat close to the main valve core is provided with an installation boss protruding in the axial direction, and the installation boss is arranged in the inner cavity of the main valve core.

[0015] Further, the inner wall of an end of the valve sleeve away from the valve body is provided with a stop ring, the inner diameter of the stop ring is smaller than the inner diameter of the control valve core, and the control valve core abuts against the stop ring.

[0016] Further, the stop ring is connected to the valve sleeve through screw threads.

[0017] Further, the plug is connected to the valve body through screw threads.

[0018] Further, the outer wall of the plug is provided with an O-shaped sealing ring and an ED ring.

[0019] The plug-in type hydraulic control switching valve with the cut-off function has the following advantages: the main valve core is provided with a taper surface for abutting against the first boss, and the taper surface is arranged between the A port and the B port, so that the main valve core will not move and the A port and the B port will not be connected, regardless of the pressure of the A port and the B port, when the plug-in type hydraulic control switching valve with the cut-off function is used in the electro-hydraulic steering system of a multi-axle heavy special vehicle, the main valve core will not move, regardless of the pressure of the A cavity and the B cavity of the power cylinder, and the A cavity and the B cavity of the power cylinder can be reliably cut off. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The figure is a schematic diagram of the plug-in type hydraulic control switching valve with the cut-off function.

[0021] Figure 2 The figure is a sectional view of the plug-in type hydraulic control switching valve with the cut-off function.

[0022] Figure 3 The figure is a structural diagram of the plug-in type hydraulic control switching valve with the cut-off function used in the electro-hydraulic steering system of a multi-axle heavy special vehicle. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0024] In the embodiments of the present invention, the terms “up,” “down,” “front,” “back,” “left,” and “right,” etc., indicate directions or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] If the embodiments of the present invention involve descriptions such as "first" or "second", such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0027] An embodiment of the present invention provides a cartridge-type hydraulic control switching valve with a shut-off function, such as... Figure 1 , Figure 2 , Figure 3 As shown, it includes valve body 1, main valve core 2, main spring 8, and plug 6.

[0028] The valve body 1 is provided with port A and port B, both of which are radial through holes on the valve body 1. A first boss 11 is provided on the inner wall of the valve body 1 near port B.

[0029] The main valve core 2 has a central through hole 26 extending along its length. One end of the main valve core 2 has a conical surface 22. An annular groove 23 is formed on the outer wall of the main valve core 2 near the conical surface 22. The main valve core 2 is located inside the valve body 1. The outer wall of the middle part of the main valve core 2 matches the inner wall of the valve body 1. A sealing ring 16 is provided between the middle part of the main valve core 2 and the inner wall of the valve body 1. Multiple sealing rings are provided on the outer wall of the valve body 1. The position of the annular groove 23 corresponds to the position of port B. The conical surface 22 is used to abut against the first boss 11. The plug 6 is connected to the first end of the valve body 1. The conical surface 22 is located between the plug 6 and the first boss 11. One end of the main spring 8 is connected to the inner wall of the plug 6. The other end of the main spring 8 is connected to the end of the main valve core 2 with the conical surface 22. Port A is located between the plug 6 and the conical surface 22. An O-ring 18 and an ED ring 21 are provided on the outer wall of the plug 6 to form a double seal. When the main valve core 2 is not under hydraulic oil pressure, the conical surface 22 of the main valve core 2 fits against the first boss 11 to form a sealing pair, achieving internal isolation between port A and port B. When the main valve core 2 is under hydraulic oil pressure, port A and port B are connected. Since the main valve core 2 is provided with a conical surface 22 for fitting against the first boss 11, and the conical surface 22 is located between port A and port B, the main valve core 2 will not move or port A and port B will not connect regardless of the pressure at port A and port B. Therefore, when the cartridge-type hydraulic control switching valve with shut-off function of this invention is used in the electro-hydraulic steering system of a multi-axle heavy-duty special vehicle, the main valve core 2 will not move regardless of the pressure at chambers A and B of the power steering cylinder, ensuring reliable isolation between chambers A and B of the power steering cylinder.

[0030] Optionally, a spring mounting boss 25 is provided on the end face of the conical surface 22 corresponding to the plug 6. The end of the main spring 8 connected to the conical surface 22 is fitted onto the spring mounting boss 25, and the spring mounting boss 25 serves as a guide for the main spring 8.

[0031] Optionally, it also includes a valve sleeve 4, a one-way valve seat 3, a valve ball 14, a control valve core 5, and a one-way valve spring 9. The valve sleeve 4 is provided with an O-port, and the outer wall of the valve sleeve 4 is provided with multiple sets of sealing rings 17 and 20. The inner wall of the valve sleeve 4 is provided with a second annular boss 41, which is located near the O-port. The other end of the valve body 1 corresponding to the plug 6 is the second end, and the valve sleeve 4 is connected to the second end of the valve body 1. The one-way valve seat 3 is located inside the valve sleeve 4. The one-way valve seat 3 is located between the other end of the main valve core 2 corresponding to the conical surface 22 and the second annular boss 41. The one-way valve seat 3 has a groove, and the valve ball 14 is located in the groove. The outer wall of the one-way valve seat 3 protrudes beyond the outer wall of the main valve core 2, and there is a gap between the outer wall of the one-way valve seat 3 and the inner wall of the valve sleeve 4. The valve ball 14 is adapted to abut against the second annular boss 41. The outer wall of the other end of the core 2 corresponding to the conical surface 22 has a receiving space between it and the inner wall of the valve body 1. The main valve core 2 is provided with a radial through hole that communicates with the receiving space. The one-way valve spring 9 is sleeved on the main valve core 2 and is located in the receiving space. The two ends of the one-way valve spring 9 are respectively connected between the one-way valve seat 3 and the valve body 1. The control valve core 5 includes a top end 51 and a moving end 52 that are connected to each other. The outer diameter of the top end 51 is smaller than the inner diameter of the valve sleeve 4. The control valve core 5 is set inside the valve sleeve 4. The top end 51 is set close to the valve ball 14. The top end 51 is used to push the one-way valve seat 3 to the left through the valve ball 14, thereby moving the main valve core 2 to the left. The moving end 52 cooperates with the inner wall of the valve sleeve 4. Multiple sealing rings 15 are provided between the moving end 52 and the inner wall of the valve sleeve 4. The end of the control valve core 5 away from the valve ball 14 is the K port. Under the spring force of the check valve spring 9, the valve seat 3 and the ball 14 of the one-way valve are fitted together with the second annular boss 41 of the valve sleeve 4 to form a sealing pair, achieving internal isolation between ports A, B and O. When there is no pressure at port K, the cone surface 22 of the main valve core 2 is fitted together with the first boss 11 under the action of the main spring 8, isolating ports A and B. The valve seat 3 and the ball valve 14 are in a reset state under the action of the check valve spring 9, with the ball valve 14 fitted together with the second boss 41, i.e., isolating ports A and O. At this time, ports A, B, O, and K of the cartridge-type hydraulic switching valve with shut-off function of this invention are all isolated from each other, thereby achieving reliable synchronous switching of ports A and B, with extremely low leakage during isolation. When hydraulic oil is connected to port K and the pressure reaches a certain value, the control valve core 5 is pushed to move to the left. The control valve core 5 pushes the valve ball 14 and the check valve seat 3 to move, causing the valve ball 14 to disengage from the second boss 41. The check valve seat 3 then pushes the main valve core 2 to move to the left, causing the conical surface 22 of the main valve core 2 to disengage from the first boss 11 of the valve body 1, thus connecting ports A, B, and O and linking them to the system return oil. When this cartridge-type hydraulic control switching valve with a shut-off function is used in the electro-hydraulic steering system of a multi-axle heavy-duty special vehicle, such as… Figure 3As shown, the electro-hydraulic steering system has two operating modes: steering mode and lock-up mode.

[0032] In steering mode, the directional valve 81 is energized, and ports D1 and D2 of the directional cylinder 82 and port K of the cartridge-type hydraulic switching valve with shut-off function of this invention are connected to the system return oil. The directional cylinder 82 is in a depressurized floating state. Under the action of the main spring 8, the conical surface 22 of the main valve core 2 of the cartridge-type hydraulic switching valve with shut-off function of this invention is in contact with the first boss 11, and ports A and B are isolated from each other. The check valve seat 3 and the ball valve 14 are in a reset state under the action of the check valve spring 9, that is, ports A and O are isolated from each other. At this time, ports A, B, O, and K of the cartridge-type hydraulic switching valve with shut-off function of this invention are all isolated from each other.

[0033] In the lock-up mode, the directional valve 81 is de-energized, and the pressure oil in the accumulator enters the D1 and D2 ports of the directional cylinder 82 to achieve the directional function. At the same time, the pressure oil enters the K port of the cartridge-type hydraulic control switching valve with the shut-off function of this invention. When the directional pressure rises to a certain value, it pushes the control valve core 5 to move to the left. The control valve core 5 pushes the valve ball 14 and the one-way valve seat 3 to move, so that the valve ball 14 disengages from the second boss 41. The one-way valve seat 3 then pushes the main valve core 2 to move to the left, so that the conical surface 22 of the main valve core 2 disengages from the first boss 11 of the valve body 1, so that the A port and B port are connected and connected to the system return oil to reduce the directional resistance.

[0034] Optionally, the valve sleeve 4 is threaded to the inner wall of the valve body 1.

[0035] Optionally, the outer wall of the valve sleeve 4 is provided with a third annular boss 43, and the valve body 1 abuts against the third annular boss 43.

[0036] Optionally, the one-way valve seat 3 is provided with an axially protruding mounting boss 36 at one end near the main valve core 2. The mounting boss 36 is located in the inner cavity of the main valve core 2 to prevent misalignment when the one-way valve seat 3 pushes the main valve core 2 to move.

[0037] Optionally, a retaining ring 10 is provided on the inner wall of the end of the valve sleeve 4 away from the valve body 1. The inner diameter of the retaining ring 10 is smaller than the inner diameter of the control valve core 5. The control valve core 5 abuts against the retaining ring 10, and the retaining ring 10 is used to position the control valve core 5.

[0038] Optionally, the retaining ring 10 is threadedly connected to the valve sleeve 4.

[0039] Optionally, the plug 6 is threaded onto the valve body 1.

[0040] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A cartridge-type hydraulic control switching valve with a shut-off function, characterized in that, Includes valve body (1), main valve core (2), main spring (8), and plug (6). The valve body (1) is provided with port A and port B, and a first boss (11) is provided on the inner wall of the valve body (1) near port B. The main valve core (2) has a central through hole (26) extending along the length of the main valve core (2). One end of the main valve core (2) has a conical surface (22). An annular groove (23) is formed on the outer wall of the main valve core (2) near the conical surface (22). The main valve core (2) is located inside the valve body (1). The outer wall of the middle part of the main valve core (2) matches the inner wall of the valve body (1). The position of the annular groove (23) corresponds to the position of the B port. The conical surface (22) abuts against the first boss (11). The plug (6) is connected to the valve. The first end of the body (1) has a conical surface (22) located between the plug (6) and the first boss (11). One end of the main spring (8) is connected to the inner wall of the plug (6), and the other end of the main spring (8) is connected to the end of the main valve core (2) with the conical surface (22). The A port is located between the plug (6) and the conical surface (22). The body also includes a valve sleeve (4), a one-way valve seat (3), a valve ball (14), a control valve core (5), and a one-way valve spring (9). The valve sleeve (4) has an O port. The inner wall of the valve sleeve (4) has a second annular boss (41). The annular boss (41) is located near the O-port. The other end of the valve body (1) corresponding to the plug (6) is the second end. The valve sleeve (4) is connected to the second end of the valve body (1). The one-way valve seat (3) is located inside the valve sleeve (4). The one-way valve seat (3) is located between the other end of the main valve core (2) corresponding to the conical surface (22) and the second annular boss (41). The one-way valve seat (3) has a groove. The valve ball (14) is located in the groove. The outer wall of the one-way valve seat (3) protrudes beyond the outer wall of the main valve core (2) and... A gap is left between the outer wall of the one-way valve seat (3) and the inner wall of the valve sleeve (4). The valve ball (14) is adapted to abut against the second annular boss (41). A receiving space is left between the outer wall of the other end of the main valve core (2) corresponding to the conical surface (22) and the inner wall of the valve body (1). A radial through hole is provided on the main valve core (2) and communicates with the receiving space. The one-way valve spring (9) is sleeved on the main valve core (2) and the one-way valve spring (9) is located in the receiving space. The two ends of the one-way valve spring (9) are respectively connected between the one-way valve seat (3) and the valve body (1).The control valve core (5) includes a top end (51) and a moving end (52) connected to each other. The outer diameter of the top end (51) is smaller than the inner diameter of the valve sleeve (4). The control valve core (5) is disposed inside the valve sleeve (4). The top end (51) is disposed close to the valve ball (14). The moving end (52) cooperates with the inner wall of the valve sleeve (4). The top end (51) is used to push the one-way valve seat (3) to the left through the valve ball (14), thereby causing the main valve core (2) to move to the left. The end of the control valve core (5) away from the valve ball (14) is a K-port.

2. The cartridge-type hydraulic switching valve with shut-off function according to claim 1, characterized in that, A spring mounting boss (25) is provided on the end face of the conical surface (22) corresponding to the plug (6), and the end of the main spring (8) connected to the conical surface (22) is fitted onto the spring mounting boss (25).

3. The cartridge-type hydraulic switching valve with shut-off function according to claim 2, characterized in that, The valve sleeve (4) is threaded to the inner wall of the valve body (1).

4. The cartridge-type hydraulic switching valve with shut-off function according to claim 3, characterized in that, The valve sleeve (4) has a third annular boss (43) on its outer wall, and the valve body (1) abuts against the third annular boss (43).

5. The cartridge-type hydraulic switching valve with shut-off function according to claim 4, characterized in that, The one-way valve seat (3) is provided with an axially protruding mounting boss (36) at one end near the main valve core (2), and the mounting boss (36) is disposed in the inner cavity of the main valve core (2).

6. The cartridge-type hydraulic switching valve with shut-off function according to claim 5, characterized in that, A retaining ring (10) is provided on the inner wall of the end of the valve sleeve (4) away from the valve body (1). The inner diameter of the retaining ring (10) is smaller than the inner diameter of the control valve core (5). The control valve core (5) abuts against the retaining ring (10).

7. The cartridge-type hydraulic switching valve with shut-off function according to claim 6, characterized in that, The retaining ring (10) is threadedly connected to the valve sleeve (4).

8. The cartridge-type hydraulic switching valve with shut-off function according to claim 7, characterized in that, The plug (6) is threadedly connected to the valve body (1).

9. The cartridge-type hydraulic switching valve with shut-off function according to claim 8, characterized in that, The plug (6) is provided with an O-ring (18) and an ED ring (21) on its outer wall.

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