Control valve, pump and motor

Abstract

The utility model relates to the technical field of hydraulic control, in particular to a control valve, a pump and a motor, the control valve comprises a valve body assembly and an electromagnet assembly, the valve body assembly comprises a control valve sleeve and a control valve core, and the control valve core is installed on the control valve sleeve in a sliding fit mode; the valve body assembly further comprises an adjusting seat, the adjusting seat is in threaded connection with the driving end of the control valve element, the electromagnet assembly comprises a push rod, and the push rod can push the adjusting seat to drive the control valve element to move. According to the control valve provided by the utility model, the driving end of the control valve core is in threaded connection with the adjusting seat, and the size of an air gap when the electromagnet extends outwards is adjusted by adjusting the thread screwing length of the adjusting seat, so that the hysteresis of a displacement control curve is improved; and the specification of the control valve core and the manpower and time cost caused by continuously replacing parts are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic control, in particular to a control valve, a pump and a motor. Background Art

[0002] Plunger pumps and motors are high-end hydraulic components that convert mechanical energy into hydraulic energy and then back into mechanical energy. They are widely used in various vehicles and supporting equipment for engineering machinery, metallurgical machinery, machine tools, marine engineering, agriculture, forestry, construction, aerospace, and other industries.

[0003] Among them, the control valve that controls the displacement is an important direction and pressure control element in the plunger pump and motor. When the plunger pump and motor input the control quantity according to the pre-set requirements, the high-pressure oil output by the plunger pump and motor will act on the variable piston size cavity of the plunger pump and motor, and the displacement of the plunger pump and motor will begin to adjust.

[0004] In the prior art, a utility model patent with application number "202321442407.0" and name "Variable Piston Motor" discloses a control valve assembly, which includes a proportional electromagnet. By controlling the current flowing through the proportional electromagnet, the proportional electromagnet generates a certain thrust acting on the valve core of the control valve. After the valve core moves, the working oil port and the oil inlet are connected, so that the high-pressure oil can drive the variable piston to move and perform variable adjustment.

[0005] This type of control valve controlled by an electromagnet has certain problems: when the displacement control curve of the plunger pump or motor has a large hysteresis, the air gap of the electromagnet can only be adjusted by constantly replacing control valve cores of different sizes and specifications to improve the hysteresis of the displacement control curve. This requires control valve cores of multiple sizes and specifications, and the constant replacement of parts also increases a lot of manpower and time costs. Utility Model Content

[0006] In order to solve the technical problem in the prior art that a control valve using an electromagnet cannot be conveniently adjusted and improved when the hysteresis loop of the displacement control curve is large, the utility model proposes a control valve, wherein an adjustment seat is threadedly connected to the driving end of the control valve core, and the air gap size of the electromagnet when it is most extended is adjusted by adjusting the length of the screw engagement of the adjustment seat, thereby improving the hysteresis loop of the displacement control curve and reducing the specifications of the control valve core and the manpower and time costs caused by continuous replacement of parts.

[0007] The technical solution of this utility model:

[0008] A control valve comprising:

[0009] A valve body assembly, the valve body assembly comprising a control valve sleeve and a control valve core, the control valve core being slidably mounted on the control valve sleeve; the valve body assembly further comprising an adjustment seat, the adjustment seat being threadedly connected to a drive end of the control valve core;

[0010] The electromagnet assembly includes a push rod, and the push rod can push the adjustment seat to drive the control valve core to move.

[0011] Furthermore, when the adjusting seat is screwed to the target position, it is fixed to the control valve core through a fixing structure.

[0012] Furthermore, a threaded hole is formed on the outer end surface of the driving end of the control valve core, and the adjustment seat includes a screw segment threadedly engaged with the threaded hole; the fixing structure includes an expansion pin and a pin hole formed on the outer end surface of the pushing end of the adjustment seat, and the expansion pin is interference fit with the pin hole. When the adjustment seat thread is screwed to the target position, the expansion pin is pressed into the pin hole for expansion and fixing.

[0013] Furthermore, after the expansion pin is pressed into the pin hole, the outer end surface of the expansion pin is flush with the outer end surface of the pushing end of the adjustment seat.

[0014] Furthermore, the valve body assembly also includes a valve body, a mounting groove is formed at one end of the valve body, the control valve sleeve is inserted into the mounting groove and installed by limiting the position through a retaining ring; the control valve core, the adjustment seat and the expansion pin are formed as a whole and installed on the control valve sleeve, and the driving end of the control valve core also has a limiting end surface that cooperates with one end of the control valve sleeve to limit the position; the driving end of the control valve core is indirectly driven by the push rod, and the other end of the control valve core is suitable for being elastically abutted.

[0015] Furthermore, the electromagnet assembly also includes a coil, a magnetic core tube and an armature. When the coil is energized, the magnetic core tube generates a magnetic force acting on the armature, and the push rod is connected to the armature; the other end of the valve body is also formed with a mounting hole that passes through the mounting groove, and the electromagnet assembly is installed in the mounting hole.

[0016] Another aspect of the present invention provides a pump comprising the control valve as described in any one of the above items.

[0017] Furthermore, the pump is a variable plunger pump; the variable plunger pump includes a rear cover, a distribution plate and a cylinder body, the control valve is installed on the rear cover, and a variable piston is also provided in the rear cover, one end of the variable piston elastically abuts against the control valve core of the control valve, and the other end of the variable piston forms a variable piston large chamber and a variable piston small chamber, the variable piston large chamber is connected to the working valve port of the control valve, and the variable piston small chamber is often connected to high-pressure oil; the middle part of the variable piston is also equipped with a shift rod, the outer end of the shift rod is inserted into the center hole of the distribution plate, and when the variable piston moves, it can drive the distribution plate and the cylinder body to swing through the shift rod.

[0018] Another aspect of the present invention provides a motor comprising a control valve as described in any one of the above items.

[0019] Furthermore, the motor is a variable piston motor; the variable piston motor includes a rear cover, a distribution plate and a cylinder body, the control valve is installed on the rear cover, and a variable piston is also provided in the rear cover, one end of the variable piston elastically abuts against the control valve core of the control valve, and the other end of the variable piston forms a variable piston large chamber and a variable piston small chamber, the variable piston large chamber is connected to the working valve port of the control valve, and the variable piston small chamber is often connected to high-pressure oil; the middle part of the variable piston is also equipped with a shift rod, the outer end of the shift rod is inserted into the center hole of the distribution plate, and when the variable piston moves, it can drive the distribution plate and the cylinder body to swing through the shift rod.

[0020] After adopting the above technical solution, the control valve, pump and motor provided by the utility model have the following beneficial effects compared with the prior art:

[0021] 1. The utility model provides a control valve, in which an adjustment seat threadedly connected to the driving end of the control valve core is provided, and the thickness of the limit end face of the control valve core is adjusted by the threaded engagement length of the adjustment seat, thereby adjusting the size of the air gap when the push rod of the electromagnet is most extended, thereby improving the hysteresis loop; compared with the existing technology, the adjustment is convenient, and the types of control valve cores and the manpower and time costs of constantly replacing the control valve cores are reduced.

[0022] 2. The present invention secures the adjustment seat to the control valve core after adjustment through a fixing structure, preventing loosening and relative displacement of the control valve core and the adjustment seat, ensuring stability during subsequent operation. Furthermore, the preferred method of tightening and locking the adjustment seat by providing an interference fit between the expansion pin and the light hole provided on the adjustment seat makes assembly more convenient.

[0023] 3. The pump and motor provided by the present invention effectively improve the hysteresis loop of the displacement control curve and enhance the accuracy and stability of the system by adopting a control valve having an adjustment structure including a control valve core, an adjustment seat and an expansion pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of the control valve of Example 1;

[0025] Figure 2 This is a schematic structural diagram of the control valve core of Example 1;

[0026] Figure 3 This is a structural diagram of the adjustment seat of Example 1;

[0027] Figure 4 This is a schematic structural diagram of the expansion pin of Example 1;

[0028] Figure 5 A schematic structural diagram of the pump of Example 2 or the motor of Example 3;

[0029] Figure 6 is a displacement control curve diagram of the pump of Example 2 or the motor of Example 3 before air gap adjustment;

[0030] Figure 7 This is a displacement control curve diagram of the pump of Example 2 or the motor of Example 3 after air gap adjustment.

[0031] in,

[0032] Control valve 1, valve body assembly 11, control valve sleeve 111, control valve core 112, limit end surface 1121, threaded hole 1122, adjustment seat 113, screw segment 1131, pin hole 1132, expansion pin 114, valve body 115, mounting groove 1151, retaining ring groove 1152, retaining ring 1153, mounting hole 1154, working valve port 116; electromagnet assembly 12, push rod 121, coil 122, magnetic core tube 123, armature 124;

[0033] Rear cover 2, variable piston 21, elastic component 22, variable piston large chamber 23, variable piston small chamber 24, shift rod 25, distribution plate 3, cylinder body 4, center rod 41, plunger 42, plunger chamber 43, main shaft 5. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0037] Example 1:

[0038] like Figure 1-4 As shown, this embodiment provides a control valve 1, which includes a valve body assembly 11 and an electromagnet assembly 12. The push rod 121 of the electromagnet assembly 12 can drive the control valve core 112 in the valve body assembly 11 to move to achieve oil circuit switching.

[0039] Specifically, the valve body assembly 11 includes a control valve sleeve 111 and a control valve core 112. The control valve sleeve 111 is fixedly installed, and the control valve core 112 is installed in the control valve sleeve 111 in a sliding manner; the driving end of the control valve core 112, that is, the end close to the push rod 121, also has a limiting end face 1121. The limiting end face 1121 is located on the inner side and is formed into a convex ring shape. The limiting end face 1121 can cooperate with one end of the control valve sleeve 111 for limiting.

[0040] Furthermore, the valve body assembly 11 also includes an adjustment seat 113, which is threadedly connected to the driving end of the control valve core 112. For example, a threaded hole 1122 can be provided on the outer end surface of the driving end of the control valve core 112, and a corresponding screw segment 1131 can be provided on the adjustment seat 113 to achieve threaded engagement; or an external thread can be provided on the outer periphery of the driving end of the control valve core 112, and an internal threaded sleeve can be provided on the adjustment seat 113 to achieve threaded engagement. The adjustment seat 113 is located between the control valve core 112 and the push rod 121. The push rod 121 can push the adjustment seat 113 to indirectly drive the movement of the control valve core 112.

[0041] In the prior art, when the hysteresis loop of the displacement control curve is large, it can only be adjusted by constantly replacing control valve cores of different sizes and specifications, which cannot achieve the adjustment of the key dimensions of the control mechanism. On the one hand, many different sizes of control valve cores are required, and on the other hand, constantly replacing parts also increases a lot of manpower and time costs. In this embodiment, by providing a threaded adjustment seat 113 at the driving end of the control valve core 112, changing the threaded engagement length of the adjustment seat 113 can adjust the tail end length of the control valve core 112, that is, the thickness L of the limit end face 1121. When the thickness L changes, the extended length of the push rod 121 at its most extended position changes, and its air gap X is also changed, thereby improving the magnetic circuit and magnetic field distribution, improving the nonlinear characteristics of the system, and reducing the hysteresis loop of the displacement control curve. Moreover, compared with the prior art, this embodiment does not require the use of multiple sizes of control valve cores 112. When adjusting, the adjustment seat 113 can be rotated, which is convenient to operate and reduces manpower and time costs.

[0042] In this embodiment, when the adjusting seat 113 is threadedly engaged to the target position, the adjusting seat 113 is fixed to the control valve core 112 via a fixing structure, thereby preventing loosening and relative displacement of the control valve core 112 and the adjusting seat 113, thereby ensuring stability during subsequent operation. The target position of the adjusting seat 113 can be determined by testing. When the test finds that the hysteresis band of the displacement control curve is reduced to the target threshold, it can be determined that the adjusting seat 113 has been adjusted to the target position. At this time, it can be fixed by a fixing structure. The fixing structure can be selected from, but not limited to, any structure that can lock the thread, such as a connection weld, a punch point, a thread glue, an expansion structure, etc.

[0043] As a preferred implementation of this embodiment, thread locking is achieved by expansion, which makes assembly more convenient. Specifically, a threaded hole 1122 is formed at the center of the outer end surface of the driving end of the control valve core 112, and the adjustment seat 113 includes a screw segment 1131, which is threadedly engaged with the threaded hole 1122. The thickness L of the limit end surface 1121 of the control valve core 112 is adjusted by the threaded engagement length of the screw segment 1131. The fixing structure includes an expansion pin 114 and a pin hole 1132 formed at the center of the outer end surface of the pushing end of the adjustment seat 113. The pin hole 1132 is a light hole. The expansion pin 114 is interference-fitted with the pin hole 1132. When the adjustment seat 113 is threadedly engaged to the target position, the expansion pin 114 is pressed into the pin hole 1132 for expansion, thereby locking the adjustment seat 113 and the control valve core 112 by thread.

[0044] Since an expansion pin 114 is provided on the adjustment seat 113, in this embodiment, after the expansion pin 114 is pressed into the pin hole 1132, the outer end surface of the expansion pin 114 is flush with the outer end surface of the push end of the adjustment seat 113, preventing the protrusion of the expansion pin 114 from affecting the air gap of the electromagnet. The expansion pin 114 is preferably located at the center of the adjustment seat 113. The push rod 121 pushes the expansion pin 114 to move the adjustment seat 113 and the control valve core 112.

[0045] The valve body assembly 11 also includes a valve body 115. A mounting groove 1151 is formed at the bottom of the valve body 115. The control valve sleeve 111 is inserted into the mounting groove 1151 from the bottom of the valve body 115. A retaining ring groove 1152 is provided on the sidewall of the mounting groove 1151. A retaining ring 1153 is inserted into the retaining ring groove 1152 to limit the axial displacement of the control valve sleeve 111. A mounting hole 1154 is also formed at the top of the valve body 115, extending through the mounting groove 1151. The inner diameter of the hole is slightly smaller than that of the mounting groove 1151. After the position of the adjustment seat 113 is determined, the control valve core 112, which has a predetermined thickness L, the adjustment seat 113, and the expansion pin 114 are assembled into a whole. The core is then inserted through the mounting hole 1154 at the top of the valve body 115, where it is assembled with the control valve sleeve 111. The electromagnet assembly 12 is threadedly connected and installed in the mounting hole 1154. The electromagnet assembly 12 also includes a coil 122, a magnetic core tube 123 and an armature 124. When the coil 122 is energized, the magnetic core tube 123 generates magnetic force to attract the armature 124. The magnitude of the attractive force is affected by the air gap between the magnetic core tube 123 and the armature 124. The push rod 121 passes through the magnetic core tube 123 and is connected to the armature 124. When the armature 124 moves, the push rod 121 moves synchronously.

[0046] During operation, the driving end of the control valve core 112 can be indirectly pushed by the push rod 121. The other end of the control valve core 112 is adapted to be elastically abutted. For example, when the control valve is installed in a variable displacement piston pump or motor, it is abutted by an elastic component provided on the variable displacement piston in the variable displacement mechanism. When the push rod 121 pushes the driving end of the control valve core 112 to cause it to move, the control valve core 112 moves to open the working valve port 116. The variable displacement piston movement exerts a feedback force on the ball end of the control valve core 112 through the elastic component, ultimately bringing the control valve core 112 into a balanced state. When the thickness L of the driving end of the control valve core 112 increases, the extended length of the push rod 121 at its most extended position decreases, and the air gap X increases. When the thickness L of the driving end of the control valve core 112 decreases, the extended length of the push rod 121 at its most extended position increases, and the air gap X decreases.

[0047] From the above content, it can be seen that the control valve provided in this embodiment has an adjustment seat threadedly connected to the driving end of the control valve core, and the thickness of the control valve core limit end face is adjusted by adjusting the length of the screw thread of the adjustment seat, thereby adjusting the size of the air gap when the electromagnet is most extended, thereby achieving adjustable key dimensions of the control mechanism, improving the hysteresis loop of the displacement control curve, and reducing the specifications of the control valve core and the manpower and time costs caused by continuous replacement of parts.

[0048] Example 2:

[0049] like Figure 5 As shown, this embodiment provides a pump, including the control valve 1 as described in the first embodiment.

[0050] Preferably, the pump is a variable piston pump. The variable piston pump includes a rear cover 2, a distribution plate 3 and a cylinder body 4, wherein an installation space is formed in the rear cover 2, and a variable piston 21 is installed in the installation space. The upper end of the installation space is open to install the control valve 1; one end of the variable piston 21 elastically abuts against the bottom end of the control valve core 112 of the control valve 1 through an elastic component 22, and the other end of the variable piston 21 is formed with a rodless cavity, i.e., a large variable piston cavity 23, and a rod cavity, i.e., a small variable piston cavity 24, through a sealing plug. By processing a flow channel (not shown in the figure) on the rear cover 2, the variable piston 21 is The large chamber 23 of the variable piston is connected to the working valve port 116 of the control valve 1 and is controlled by the control valve 1. The small chamber 24 of the variable piston is always connected to high-pressure oil. The middle part of the variable piston 21 is also equipped with a shift rod 25, and the outer end of the shift rod 25 is inserted into the center hole of the distribution plate 3. One side of the distribution plate 3 is a spherical surface that is self-centered with the spherical surface at the bottom of the cylinder body 4, and the other side is matched with the rear cover 2. A center rod 41 is provided in the center of the cylinder body 4, and a plurality of plungers 42 are provided on the outer periphery of the center rod 41. The center rod 41 and the plungers 42 are both connected to the main shaft 5 through a ball head structure.

[0051] When the control valve 1 is activated to make the variable piston large chamber 23 pass through P (high-pressure oil at port AB), oil enters the variable piston large chamber 23, and the oil pressure in the variable piston large chamber 23 is greater than the oil pressure in the variable piston small chamber 24. The variable piston 21 moves upward and, in association, brings the cylinder body 4 to swing upward around the center of the ball head of the center rod 41. The upward swing of the cylinder body 4 causes the stroke of the plunger 42 in the plunger hole of the cylinder body 4 to be shortened, and the volume of the plunger chamber 43 to be reduced, thereby reducing the displacement of the pump; conversely, when the control valve 1 is activated to make the variable piston large chamber 23 pass through T (oil return from the housing chamber), oil flows out of the variable piston large chamber 23, and the oil pressure in the variable piston large chamber 23 is less than the oil pressure in the variable piston small chamber 24. The variable piston 21 moves downward and, in association, brings the cylinder body 4 to swing downward around the center of the ball head of the center rod 41. The downward swing of the cylinder body 4 causes the stroke of the plunger 42 in the plunger hole of the cylinder body 4 to be lengthened, and the volume of the plunger chamber 43 to be increased, thereby increasing the displacement of the pump.

[0052] During the opening and closing of the working valve port 116, the control valve core 112 is controlled by the thrust and return resistance of the push rod 121. If the air gap X is too small, the return resistance of the push rod 121 will increase, resulting in excessive hysteresis in the pump's displacement control curve. If the air gap X is too large, the pushing force of the push rod 121 will decrease, affecting the pump's variable displacement. Therefore, it is necessary to adjust the air gap X when the push rod 121 is fully extended using the adjustment seat 113 described in the first embodiment.

[0053] Figure 6 The figure shows the displacement control curve before thickness L / air gap X adjustment. The horizontal axis is the current applied to the electromagnet coil of the test piece, and the vertical axis is the displacement of the variable piston pump. It can be seen that before the air gap adjustment, the linearity of the displacement control curve is poor and the hysteresis loop is also large. Figure 7 The figure shows the displacement control curve after the thickness L / air gap X is adjusted. The horizontal and vertical coordinates are Figure 6 Similarly, it can be seen that after adjusting the air gap by adjusting the seat 113, the linearity and hysteresis of the displacement control curve are improved.

[0054] Example 3:

[0055] Reference Figure 5-7 , this embodiment provides a motor, including the control valve 1 as described in the first embodiment.

[0056] Preferably, the motor is a variable piston motor. The variable piston motor includes a rear cover 2, a distribution plate 3 and a cylinder body 4, wherein an installation space is formed in the rear cover 2, and a variable piston 21 is installed in the installation space. The upper end of the installation space is open to install the control valve 1; one end of the variable piston 21 elastically abuts against the bottom end of the control valve core 112 of the control valve 1 through an elastic component 22, and the other end of the variable piston 21 is formed with a rodless cavity, i.e., a large variable piston cavity 23, and a rod cavity, i.e., a small variable piston cavity 24, through a sealing plug. By processing a flow channel (not shown in the figure) on the rear cover 2, the variable piston 21 is The large chamber 23 of the variable piston is connected to the working valve port 116 of the control valve 1 and is controlled by the control valve. The small chamber 24 of the variable piston is always connected to high-pressure oil. The middle part of the variable piston 21 is also equipped with a shift rod 25, and the outer end of the shift rod 25 is inserted into the center hole of the distribution plate 3. One side of the distribution plate 3 is a spherical surface that is self-centered with the spherical surface at the bottom of the cylinder body 4, and the other side is matched with the rear cover 2. A center rod 41 is provided in the center of the cylinder body 4, and a plurality of plungers 42 are provided on the outer periphery of the center rod 41. The center rod 41 and the plungers 42 are both connected to the main shaft 5 through a ball head structure.

[0057] When the control valve 1 is activated to make the variable piston large chamber 23 pass through P (high-pressure oil at port AB), oil enters the variable piston large chamber 23, and the oil pressure in the variable piston large chamber 23 is greater than the oil pressure in the variable piston small chamber 24. The variable piston 21 moves upward and, in association, brings the cylinder body 4 to swing upward around the center of the ball head of the center rod 41. The upward swing of the cylinder body 4 causes the stroke of the plunger 42 in the plunger hole of the cylinder body 4 to be shortened, and the volume of the plunger chamber 43 to be reduced, thereby reducing the displacement of the motor; conversely, when the control valve 1 is activated to make the variable piston large chamber 23 pass through T (oil return from the housing chamber), oil flows out of the variable piston large chamber 23, and the oil pressure in the variable piston large chamber 23 is less than the oil pressure in the variable piston small chamber 24. The variable piston 21 moves downward and, in association, brings the cylinder body 4 to swing downward around the center of the ball head of the center rod 41. The downward swing of the cylinder body 4 causes the stroke of the plunger 42 in the plunger hole of the cylinder body 4 to be lengthened, and the volume of the plunger chamber 43 to be increased, thereby increasing the displacement of the motor.

[0058] During the opening and closing of the working valve port 116, the control valve core 112 is controlled by the thrust and return resistance of the push rod 121. If the air gap X is too small, the return resistance of the push rod 121 will increase, resulting in excessive hysteresis in the motor's displacement control curve. If the air gap X is too large, the pushing force of the push rod 121 will decrease, affecting the motor's displacement. Therefore, it is necessary to adjust the air gap X when the push rod 121 is fully extended using the adjustment seat 113 described in the first embodiment.

[0059] Figure 6 The figure shows the displacement control curve before thickness L / air gap X adjustment. The horizontal axis is the current applied to the electromagnet coil of the test piece, and the vertical axis is the displacement of the variable piston motor. It can be seen that before air gap adjustment, the displacement control curve has poor linearity and a large hysteresis loop. Figure 7 The figure shows the displacement control curve after the thickness L / air gap X is adjusted. The horizontal and vertical coordinates are Figure 6 Similarly, it can be seen that after adjusting the air gap by adjusting the seat 113, the linearity and hysteresis of the displacement control curve are improved.

[0060] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A control valve, characterized in that: include: A valve body assembly (11), the valve body assembly (11) comprising a control valve sleeve (111) and a control valve core (112), the control valve core (112) being mounted on the control valve sleeve (111) in a sliding manner; the valve body assembly (11) further comprising an adjustment seat (113), the adjustment seat (113) being threadedly connected to a driving end of the control valve core (112); An electromagnet assembly (12), the electromagnet assembly (12) comprising a push rod (121), the push rod (121) being capable of pushing the adjustment seat (113) to drive the control valve core (112) to move.

2. The control valve according to claim 1, characterized in that When the adjusting seat (113) is screwed to a target position, it is fixed to the control valve core (112) via a fixing structure.

3. The control valve according to claim 2, characterized in that A threaded hole (1122) is formed on the outer end surface of the driving end of the control valve core (112), and the adjustment seat (113) includes a screw segment (1131) threadedly engaged with the threaded hole (1122); the fixing structure includes a tightening pin (114) and a pin hole (1132) formed on the outer end surface of the pushing end of the adjustment seat (113), the tightening pin (114) and the pin hole (1132) are interference-fitted, and when the adjustment seat (113) is screwed to the target position, the tightening pin (114) is pressed into the pin hole (1132) for tightening and fixing.

4. The control valve according to claim 3, characterized in that After the expansion pin (114) is pressed into the pin hole (1132), the outer end surface of the expansion pin (114) is flush with the outer end surface of the pushing end of the adjustment seat (113).

5. The control valve according to claim 4, characterized in that The valve body assembly (11) further comprises a valve body (115), one end of which is formed with a mounting groove (1151), the control valve sleeve (111) being placed in the mounting groove (1151) and being mounted by limiting the position with a retaining ring (1153); the control valve core (112), the adjustment seat (113) and the expansion pin (114) forming a whole and being mounted on the control valve sleeve (111), the driving end of the control valve core (112) also comprising a limiting end face (1121) which cooperates with one end of the control valve sleeve (111) for limiting the position; the driving end of the control valve core (112) is indirectly driven by the push rod (121), and the other end of the control valve core (112) is adapted to be elastically abutted.

6. The control valve according to claim 5, characterized in that The electromagnet assembly (12) further includes a coil (122), a magnetic core tube (123) and an armature (124). When the coil (122) is energized, the magnetic core tube (123) generates a magnetic force acting on the armature (124), and the push rod (121) is connected to the armature (124). The other end of the valve body (115) is further formed with a mounting hole (1154) that passes through the mounting groove (1151), and the electromagnet assembly (12) is mounted in the mounting hole (1154).

7. A pump, characterized in that: Comprising the control valve according to any one of claims 1 to 6.

8. The pump according to claim 7, characterized in that The pump is a variable piston pump; the variable piston pump comprises a rear cover (2), a distribution plate (3) and a cylinder body (4); the control valve is mounted on the rear cover (2); a variable piston (21) is further provided in the rear cover (2); one end of the variable piston (21) elastically abuts against the control valve core (112) of the control valve; the other end of the variable piston (21) is formed with a variable piston large cavity (23) and a variable piston small cavity (24); the variable piston large cavity (23) is communicated with the working valve port (116) of the control valve, and the variable piston small cavity (24) is always connected to high-pressure oil; a shift rod (25) is further provided in the middle of the variable piston (21); the outer end of the shift rod (25) is inserted into the center hole of the distribution plate (3); when the variable piston (21) moves, it can drive the distribution plate (3) and the cylinder body (4) to swing through the shift rod (25).

9. A motor, characterized in that: Comprising the control valve according to any one of claims 1 to 6.

10. The motor according to claim 9, characterized in that The motor is a variable piston motor; the variable piston motor comprises a rear cover (2), a distribution plate (3) and a cylinder body (4); the control valve is mounted on the rear cover (2); a variable piston (21) is further provided in the rear cover (2); one end of the variable piston (21) elastically abuts against the control valve core (112) of the control valve; the other end of the variable piston (21) is formed with a variable piston large cavity (23) and a variable piston small cavity (24); the variable piston large cavity (23) is communicated with the working valve port (116) of the control valve, and the variable piston small cavity (24) is always connected to high-pressure oil; a shift rod (25) is further provided in the middle of the variable piston (21); the outer end of the shift rod (25) is inserted into the center hole of the distribution plate (3); when the variable piston (21) moves, it can drive the distribution plate (3) and the cylinder body (4) to swing through the shift rod (25).

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