A control valve group and hydraulic motor

Abstract

The utility model relates to a hydraulic technology field especially relates to a control valve group and hydraulic motor. A control valve group for controlling the variable mechanism of hydraulic motor, include: first control valve for selecting the pressure oil of one of two oil ports of hydraulic motor as control oil, control oil communicates with the rod cavity of variable mechanism, second control valve for controlling the rodless cavity of variable mechanism introduces control oil or back oil. A kind of hydraulic motor, including: control valve group;Motor body;Variable mechanism for adjusting the displacement of motor body. The control oil source in the motor device of prior art is from the high pressure of motor inlet, the high-low pressure of control oil source cannot be realized by host operator self-selection, so, once encountering resistance or steering, motor inlet pressure will be multiplied instantly, and the technical problem that pressure increase leads to the change of motor from initial small displacement to large displacement, and the rotation speed is slow.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic technology, and in particular to a control valve assembly and a hydraulic motor. Background Technology

[0002] Hydraulic motors are high-end hydraulic components, primarily used in vehicles, construction machinery, metallurgical machinery, machine tools, and other equipment. A hydraulic piston motor converts the hydraulic pressure energy provided by a hydraulic pump into mechanical energy on the output shaft. The variable displacement mechanism is a crucial component in the hydraulic piston motor for both direction and pressure control. When the hydraulic piston motor pressure reaches the set requirement of the control valve, the high-pressure hydraulic fluid output by the motor acts on the large and small chambers of the variable piston, adjusting the motor's displacement.

[0003] In existing technologies, in closed-loop systems, the control valve switching method for hydraulic piston motors is internal high-pressure oil control. For example, application CN202010570383.1 discloses a direct-shaft axial piston variable displacement motor device with constant pressure control, mainly composed of a return spring, a small variable piston, a large variable piston, a pressure regulating spring, a constant pressure control valve, a first check valve, and a second check valve forming the variable displacement mechanism of the distribution plate. A and B are the working ports, and X is the control port. In the initial state, the constant pressure control valve is in the right position, and the motor inlet oil is constantly flowing through the small variable piston. The oil from the large variable piston flows through the constant pressure control valve to the oil tank T, so the motor initially operates at a small displacement. When the oil pressure at the left end of the constant pressure control valve rises to the pressure setting value of the pressure regulating spring, the left position begins to operate. At this time, the oil path from the large variable piston to the return oil T is cut off, and the large variable piston is connected to the high-pressure oil inlet of the motor. Under the force of the large variable piston, the distribution plate changes towards a large displacement. The control oil source connected to the aforementioned motor device comes from the high pressure at the motor inlet. The high pressure at the motor inlet is selected by a one-way valve, which does not allow the main unit operator to manually select the high or low pressure of the control oil source. As a result, once resistance is encountered or the direction of change is made, the motor inlet pressure will instantly double. The increased pressure causes the motor to change from an initial small displacement to a large displacement, and the speed will slow down. Utility Model Content

[0004] To address the technical problem in existing technologies where the control oil source for the motor device is derived from the high pressure at the motor inlet, making it impossible for the operator to manually select the high or low pressure of the control oil source, and consequently causing the motor inlet pressure to instantly double upon encountering resistance or changing direction, leading to a change in motor speed from an initial small displacement to a large displacement, this invention provides a control valve assembly and a hydraulic motor that solve the aforementioned technical problems.

[0005] The technical solution of this utility model is as follows:

[0006] This utility model provides a control valve assembly for controlling the variable mechanism of a hydraulic motor, comprising:

[0007] The first control valve is used to select the pressure oil from one of the two ports of the hydraulic motor as the control oil, and the control oil is connected to the rod chamber of the variable mechanism;

[0008] The second control valve is used to control the introduction or return of control oil to the rodless chamber of the variable mechanism.

[0009] According to one embodiment of the present invention, in the power-off state, the first control valve controls the low-pressure oil at the outlet of the hydraulic motor as control oil; in the power-on state, the first control valve controls the high-pressure oil at the inlet of the hydraulic motor as control oil.

[0010] According to one embodiment of the present invention, the first control valve controls the opening and closing of the first oil passage, the second oil passage and the control oil passage, the two oil ports of the hydraulic motor are respectively unidirectionally connected to the first oil passage and the second oil passage, the control oil passage is connected to the rod chamber of the variable mechanism, and the control oil passage is connected to the rodless chamber of the variable mechanism under the control of the second control valve.

[0011] According to one embodiment of the present invention, in the de-energized state, the second control valve controls the return of oil to the rodless chamber of the variable mechanism; in the energized state, the second control valve controls the control oil to enter the rodless chamber of the variable mechanism.

[0012] According to one embodiment of the present invention, it further includes a valve body, on which the first control valve and the second control valve are both mounted. The first control valve and the second control valve are arranged adjacent to each other, and the axis of the first control valve is perpendicular to but does not intersect with the axis of the second control valve.

[0013] This utility model also provides a hydraulic motor, comprising:

[0014] Control valve assembly;

[0015] Motor body;

[0016] The variable displacement mechanism is used to adjust the displacement of the motor body.

[0017] According to one embodiment of the present invention, the motor body is assembled inside a housing, the housing including a shell and a rear cover, and the control valve assembly is integrated inside the rear cover.

[0018] According to one embodiment of the present invention, the variable mechanism includes a variable piston, which is assembled inside the rear cover, and the variable piston acts on the motor body through a lever.

[0019] According to one embodiment of the present invention, a guide groove is formed on the back cover to facilitate the passage of the lever. The guide groove includes a connected middle part and two end parts, and the two ends of the middle part are connected to the end parts through outwardly expanding transition parts.

[0020] According to one embodiment of the present invention, the middle part is square, the two ends are arc-shaped, the inner diameter of the two ends is greater than the width of the middle part, and the two sides of the transition part are inclined at 15-25 degrees relative to the two sides of the middle part.

[0021] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:

[0022] The control valve assembly of this utility model uses a first control valve to select the pressure oil from one of the two oil ports of the hydraulic motor as the control oil. When encountering resistance or turning, the working pressure at the motor inlet increases instantaneously. At this time, the first control valve can select the low-pressure oil at the hydraulic motor outlet as the control oil. The control oil enters the rod chamber of the variable mechanism, and the second control valve controls the return oil from the rodless chamber of the variable mechanism. In this way, the hydraulic motor can be in a state of small displacement and high speed.

[0023] The control valve assembly of this utility model further configures the states of the first control valve and the second control valve. When the hydraulic motor is working normally, the first control valve and the second control valve are energized. The control oil is taken from the high-pressure oil inlet of the hydraulic motor and can directly enter the rod chamber of the variable mechanism. The control oil also enters the rodless chamber of the variable mechanism through the second control valve. Due to the difference in the working area between the rod chamber and the rodless chamber of the variable mechanism, the variable piston of the variable mechanism moves to adjust the displacement of the hydraulic motor. When the hydraulic motor encounters resistance or changes direction, the first control valve and the second control valve are de-energized. The control oil is taken from the low-pressure oil outlet of the hydraulic motor and enters the rod chamber of the variable mechanism. The rodless chamber of the variable mechanism returns oil, so the variable piston does not move, and the hydraulic motor is in a state of small displacement and high speed.

[0024] The control valve assembly of this utility model has a first control valve and a second control valve mounted on the same valve body and arranged adjacent to each other. The axis of the first control valve is perpendicular to the axis of the second control valve but does not intersect. It occupies little space and facilitates the flow of control oil between the first control valve and the second control valve.

[0025] The hydraulic motor of this utility model uses a control valve group to adjust the displacement, which can keep the hydraulic motor in a state of small displacement and high speed when encountering resistance or turning. That is, when the pressure at the oil inlet of the hydraulic motor increases, the variable piston of the hydraulic motor does not move. In addition, it can also meet the operator's desire to keep the hydraulic motor in a state of small displacement and high speed.

[0026] The hydraulic motor of this utility model has a control valve assembly mounted on the rear cover and a variable piston mounted inside the rear cover. It has a high degree of integration, small size, and facilitates the control valve assembly to control the oil inlet and outlet of the variable piston.

[0027] The hydraulic motor of this utility model has a guide groove on the back cover. The middle part and the two ends of the guide groove are connected by a transition part. The shape of the guide groove is specifically set to avoid jamming during the movement of the variable piston driving the lever. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the control valve assembly of this utility model;

[0029] Figure 2 This is a sectional view of the control valve assembly;

[0030] Figure 3 for Figure 2 CC section view;

[0031] Figure 4 This is a partial cross-sectional view of the hydraulic motor of this utility model;

[0032] Figure 5 This is a schematic diagram of the guide groove on the back cover;

[0033] Figure 6 This is a hydraulic schematic diagram of a hydraulic motor.

[0034] In the diagram: 1-First control valve; 11-First valve core; 12-First electromagnetic assembly; 2-Second control valve; 21-Valve sleeve; 22-Second valve core; 23-Elastic element; 24-Second electromagnetic assembly; 25-Limit spring seat; 3-Valve body; 31-First oil passage; 32-Second oil passage; 33-Control oil passage; 4-Motor body; 41-Rotating body; 42-Distribution plate; 5-Outer shell; 51-Rear cover; 511-Guide groove; 5111-Middle part; 5112-End; 5113-Transition part; 6-Variable mechanism; 61-Variable piston; 611-Rod chamber; 612-Rodless chamber; 62-Lever. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0038] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0039] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0040] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0041] like Figure 1-3 As shown, this embodiment proposes a control valve group for controlling the variable mechanism 6 of a hydraulic motor. The control valve group includes a first control valve 1 and a second control valve 2. The first control valve 1 is used to select the pressure oil of one of the two oil ports of the hydraulic motor as the control oil. The control oil is directly connected to the rod chamber 611 of the variable mechanism 6. The second control valve 2 controls the rodless chamber 612 of the variable mechanism 6 to introduce or return control oil.

[0042] like Figure 3 As shown, the first control valve 1 is assembled inside the valve body 3. The valve body 3 has a first oil passage 31, a second oil passage 32 and a control oil passage 33. The two oil ports of the hydraulic motor are respectively connected to the first oil passage 31 and the second oil passage 32. The first control valve 1 is used to control the connection between the first oil passage 31 or the second oil passage 32 and the control oil passage 33 to realize the selection of control oil.

[0043] As a preferred technical solution in this embodiment, the first oil passage 31 is connected to the oil port A of the hydraulic motor, and the second oil passage 32 is connected to the oil port B of the hydraulic motor. Oil port A can be the oil inlet of the hydraulic motor, and oil port B can be the oil outlet of the hydraulic motor. That is, when the first control valve 1 controls the first oil passage 31 to be connected to the control oil passage 33, the high-pressure oil at the oil inlet of the hydraulic motor is selected as the control oil; when the first control valve 1 controls the second oil passage 32 to be connected to the control oil passage 33, the low-pressure oil at the oil outlet of the hydraulic motor is selected as the control oil.

[0044] As a preferred technical solution in this embodiment, a one-way valve is provided on both the first oil passage 31 and the second oil passage 32 to control the oil from oil port A to flow unidirectionally to the first control valve 1, and to control the oil from oil port B to flow unidirectionally to the first control valve 1.

[0045] As a preferred embodiment, the first control valve 1 can be configured as a solenoid valve, specifically a two-position three-way valve. The first solenoid valve 1 includes a first valve core 11 and a first solenoid assembly 12. The first valve core 11 is slidably mounted within the valve body 3. The first solenoid assembly 12 is located at one axial end of the first valve core 11 and acts on the first valve core 11. A spring is provided at the other axial end of the first valve core 11. When the first solenoid assembly 12 is de-energized, the first valve core 11 is in its initial position under the force of the spring. The first valve core 11 controls the connection between the second oil passage 32 and the control oil passage 33, meaning the control oil in the control oil passage 33 is taken from the low-pressure oil at port B. When the first solenoid assembly 12 is energized, the first valve core 11 moves against the force of the spring under the action of the first solenoid assembly 12. The first valve core 11 controls the connection between the first oil passage 31 and the control oil passage 33, meaning the control oil in the control oil passage 33 is taken from the high-pressure oil at port A.

[0046] As a preferred technical solution in this embodiment, the control oil passage 33 is connected to the rod cavity 611 of the variable mechanism 6.

[0047] like Figure 2 As shown, the second control valve 2 is also assembled inside the valve body 3. The second control valve 2 controls the inlet and outlet of oil in the rodless chamber 612 of the variable mechanism 6. The second control valve 2 can be configured as a solenoid valve. The second control valve 2 includes a valve sleeve 21, a second valve core 22, an elastic element 23, and a second electromagnetic assembly 24. The valve sleeve 21 is limited and assembled inside the valve body 3. The second valve core 22 is slidably assembled inside the valve sleeve 21. The second electromagnetic assembly 24 is located at one axial end of the second valve core 22, and the elastic element 23 is located at the other axial end of the second valve core 22. When the second electromagnetic assembly 24 is de-energized, the second valve core 22 is in the initial position under the action of the elastic element 23, and the second valve core 22 controls the return oil in the rodless chamber 612 of the variable mechanism 6. When the second electromagnetic assembly 24 is energized, the second valve core 22 moves against the force of the elastic element 23 under the action of the second electromagnetic assembly 24, and the second valve core 22 controls the control oil in the control oil passage 33 to enter the rodless chamber 612 of the variable mechanism 6.

[0048] As a preferred embodiment, the second control valve 2 can be configured as a two-position three-way valve. The valve sleeve 21 of the second control valve 2 has three ports: port a, port b, and port t. Port a is connected to the control oil passage 33, port b is connected to the rodless chamber 612 of the variable mechanism 6, and port t is connected to the oil tank T. When the second electromagnetic component 24 is de-energized, the second valve core 22 is in its initial position, controlling port b to connect with port t, allowing oil to return to the rodless chamber 612 of the variable mechanism 6. When the second electromagnetic component 24 is energized, the second valve core 22 switches positions, controlling port a to connect with port b, allowing control oil from the control oil passage 33 to enter the rodless chamber 612 of the variable mechanism 6.

[0049] As a preferred technical solution in this embodiment, the elastic element 23 may be selected from, but is not limited to, a spring. The elastic element 23 may be assembled in the limiting spring seat 25 and act on the second valve core 22.

[0050] As a preferred technical solution in this embodiment, the first control valve 1 and the second control valve 2 are arranged adjacent to each other, and the axis of the first control valve 1 is perpendicular to the axis of the second control valve 2 but does not intersect.

[0051] like Figure 4-6 As shown, this embodiment also provides a hydraulic motor, including a motor body 4, a housing 5, a variable displacement mechanism 6 and the aforementioned control valve group. The control valve group selects high-pressure oil at the inlet or low-pressure oil at the outlet of the motor body 4 as control oil to control the operation of the variable displacement mechanism 6. The variable displacement mechanism 6 is used to adjust the displacement of the motor body 4.

[0052] like Figure 4 As shown, both the motor body 4 and the variable mechanism 6 are housed within the outer casing 5. The outer casing 5 includes a housing and a rear cover 51, which are fixedly connected. The motor body 4 includes a rotating body 41 and a distribution plate 42. The rotating body 41 is located within the outer casing 5, and the distribution plate 42 is located between the rotating body 41 and the rear cover 51 and is pressed against it. The variable mechanism 6 is mounted on the rear cover 51, which forms a variable space. The variable mechanism 6 includes a variable piston 61 and a lever 62. The variable piston 61 is slidably mounted within the rear cover 51. A piston is installed at the first end of the variable piston 61, which is located within the variable space, dividing the variable space into a rod-type chamber 611 and a rodless chamber 612. The second end of the variable piston 61 extends out of the variable space and acts on the motor body 4 via the lever 62.

[0053] As a preferred technical solution in this embodiment, the variable piston 61 and the lever 62 are in a basically perpendicular state, with one end of the lever 62 inserted into the variable piston 61 and the other end inserted into the distribution plate 42.

[0054] As a preferred technical solution in this embodiment, such as Figure 5As shown, a guide groove 511 is formed on the back cover 51 to facilitate the passage of the lever 62. The guide groove 511 includes a connected middle portion 5111 and two end portions 5112. The two ends of the middle portion 5111 are connected to the end portions 5112 by outwardly flared transition portions 5113. Preferably, the middle portion 5111 is square, the end portions 5112 are arc-shaped, and the two sides of the transition portion 5113 are inclined sides relative to the two long sides of the middle portion 5111. One end of the transition portion 5113 is connected to the middle portion 5111, and the other end is tangentially connected to the end portions 5112. The inner diameter of the end portions 5112 is larger than the width of the middle portion 5111, and the two sides of the transition portion 5113 are inclined outward relative to the two long sides of the middle portion 5111 by an inclination angle of α, where α is 15-25 degrees.

[0055] The control valve assembly is mounted on the rear cover 51. Specifically, the valve core 3 of the control valve assembly is inserted into the rear cover 51, so that the second control valve 2 and the variable piston 61 are adjacent and basically coaxial. The limit spring seat 25 of the second control valve 2 can extend into the rear cover 51 and is adjacent to the second end of the variable piston 61. A limit spring is provided in the rear cover 51, and the two ends of the limit spring act on the rear cover 51 and the limit spring seat 25 respectively.

[0056] Based on the above technical solution, in this embodiment, when the hydraulic motor encounters resistance or changes direction, or when the operator wishes to maintain the hydraulic motor in a state of small displacement and high speed, the first control valve 1 can select low-pressure oil from the hydraulic motor's outlet as the control oil to control the hydraulic motor in a state of small displacement and high speed. Regardless of the working condition, the operator can automatically select low-pressure oil as the control oil to keep the motor in its initial state of small displacement and high speed.

[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A control valve assembly for controlling a variable displacement mechanism (6) of a hydraulic motor, characterized in that, include: The first control valve (1) is used to select the pressure oil of one of the two ports of the hydraulic motor as the control oil, and the control oil is connected to the rod chamber (611) of the variable mechanism (6); The second control valve (2) is used to control the rodless chamber (612) of the variable mechanism (6) to introduce or return control oil.

2. A control valve assembly according to claim 1, characterized in that, In the power-off state, the first control valve (1) controls the low-pressure oil at the outlet of the hydraulic motor as control oil; in the power-on state, the first control valve (1) controls the high-pressure oil at the inlet of the hydraulic motor as control oil.

3. A control valve assembly according to claim 2, characterized in that, The first control valve (1) controls the opening and closing of the first oil passage (31), the second oil passage (32) and the control oil passage (33). The two oil ports of the hydraulic motor are connected unidirectionally to the first oil passage (31) and the second oil passage (32) respectively. The control oil passage (33) is connected to the rod chamber (611) of the variable mechanism (6). Under the control of the second control valve (2), the control oil passage (33) is connected to the rodless chamber (612) of the variable mechanism (6).

4. A control valve assembly according to claim 1, characterized in that, In the de-energized state, the second control valve (2) controls the return oil in the rodless chamber (612) of the variable mechanism (6); in the energized state, the second control valve (2) controls the control oil to enter the rodless chamber (612) of the variable mechanism (6).

5. A control valve assembly according to claim 1, characterized in that, It also includes a valve body (3), on which the first control valve (1) and the second control valve (2) are both mounted. The first control valve (1) and the second control valve (2) are arranged adjacent to each other. The axis of the first control valve (1) is perpendicular to the axis of the second control valve (2) but does not intersect.

6. A hydraulic motor, characterized in that, include: The control valve assembly according to any one of claims 1-5; Motor body (4); The variable mechanism (6) is used to adjust the displacement of the motor body (4).

7. A hydraulic motor according to claim 6, characterized in that, The motor body (4) is assembled inside the housing (5), which includes a housing and a rear cover (51), and the control valve assembly is assembled on the rear cover (51).

8. A hydraulic motor according to claim 7, characterized in that, The variable mechanism (6) includes a variable piston (61), which is installed inside the rear cover (51) and acts on the motor body (4) through a lever (62).

9. A hydraulic motor according to claim 8, characterized in that, The rear cover (51) has a guide groove (511) that facilitates the passage of the lever (62). The guide groove (511) includes a middle part (5111) and two end parts (5112). The two ends of the middle part (5111) are connected to the end parts (5112) by an outwardly flared transition part (5113).

10. A hydraulic motor according to claim 9, characterized in that, The middle part (5111) is square, and the two ends (5112) are arc-shaped. The inner diameter of the two ends (5112) is greater than the width of the middle part (5111). The two sides of the transition part (5113) are inclined at 15-25 degrees relative to the two sides of the middle part (5111).

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