Axial plunger hydraulic motor

Abstract

The utility model relates to an axial plunger hydraulic motor which comprises a shell, a rear cover, a main shaft, a cylinder body, a sliding block and a driving device. A cavity is defined by the shell and the rear cover, and a guide face is arranged on the inner wall of the rear cover. The main shaft is rotationally connected to the shell; the cylinder body is configured to be in guide fit with the guide surface of the rear cover, and is configured to be capable of sliding along the guide surface of the rear cover; a plunger which is in transmission connection with the main shaft is arranged in the cylinder body, and the plunger is configured to drive the main shaft to rotate when moving in the cylinder body; the sliding block is arranged on the rear cover in a guiding fit mode and is constructed to be connected with the cylinder body. The driving device is in transmission connection with the sliding block and is configured to drive the sliding block to drive the cylinder body to move in the cavity. Accurate variable of the axial plunger hydraulic motor is realized through the driving device and the sliding block, so that the axial plunger hydraulic motor is more practical; in addition, the structure of the rear cover is simplified, and the production cost is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of hydraulic technology, and particularly to an axial piston hydraulic motor. Background Art

[0002] A hydraulic motor generally refers to an energy conversion device that outputs rotational motion and converts the hydraulic energy provided by a hydraulic pump into mechanical energy. An axial piston hydraulic motor is a type of hydraulic motor that relies on the reciprocating motion of pistons to change the volume within the piston cylinders for sucking in and discharging hydraulic oil. Axial piston motors have advantages such as high efficiency, long lifespan, multiple variable forms, and the ability to use different media, and are thus widely used.

[0003] In the prior art, the variable module is the key to controlling the variable of the piston hydraulic motor. The variable module is usually a manual variable module, and the structure and transmission relationship of this variable module are relatively complex, which results in a high failure rate and the inability to achieve precise control, etc. Therefore, it is particularly important to seek an axial piston hydraulic motor that can achieve precise variable. Utility Model Content

[0004] The present disclosure provides an axial piston hydraulic motor to solve the problems existing in the prior art.

[0005] According to a first aspect of the present disclosure, there is provided an axial piston hydraulic motor, comprising:

[0006] A housing and a rear cover, the housing and the rear cover enclose a chamber, wherein a guiding surface is provided on the inner wall of the rear cover;

[0007] A main shaft, the main shaft is rotatably connected to the housing;

[0008] A cylinder block, the cylinder block is configured to be guidingly fitted on the guiding surface of the rear cover and is configured to be able to slide along the guiding surface of the rear cover; a piston is provided in the cylinder block and is in transmission connection with the main shaft, and the piston is configured to drive the main shaft to rotate when moving within the cylinder block;

[0009] A slider, the slider is guidingly fitted on the rear cover and is configured to be in transmission connection with the cylinder block;

[0010] A driving device, the driving device is in transmission connection with the slider and is configured to drive the slider to drive the cylinder block to move within the chamber.

[0011] In an embodiment of the present disclosure, a distribution plate guidingly fitted with the guiding surface is provided in the chamber, the cylinder block is configured to be mounted on the distribution plate, and the distribution plate is configured to be in transmission connection with the slider.

[0012] In one embodiment of the present disclosure, the rear cover is provided with a piston hole, and the slider is configured to move within the piston hole to drive the distribution plate and the cylinder block located on the distribution plate to move within the chamber.

[0013] In one embodiment of the present disclosure, the rear cover is provided with a through hole communicating the piston hole with the chamber, and further includes a pin passing through the through hole. One end of the pin located within the piston hole is configured to be fixedly connected to the slider, and one end located within the chamber is configured to be movably connected to the distribution plate.

[0014] In one embodiment of the present disclosure, the driving device has a telescopic rod, and a connecting rod connecting the telescopic rod and the slider is disposed within the piston hole. The driving device is configured to drive the telescopic rod and drive the slider to move within the piston hole through the connecting rod.

[0015] In one embodiment of the present disclosure, a sensor is disposed on the driving device, and the sensor is configured to detect the extension amount of the telescopic rod.

[0016] In one embodiment of the present disclosure, a control unit is included. The control unit is configured to be communicatively connected to the sensor and the driving device, and the control unit is configured to control the driving device to drive the telescopic rod to move to a predetermined position based on the sensor.

[0017] In one embodiment of the present disclosure, a mechanical locking device is disposed within the driving device, and the mechanical locking device is configured to mechanically lock the telescopic rod.

[0018] In one embodiment of the present disclosure, the driving device is a servo electric cylinder.

[0019] In one embodiment of the present disclosure, the driving device is a servo oil cylinder.

[0020] One beneficial effect of the present disclosure is that the present disclosure drives the slider to move within the rear cover through the driving device, drives the distribution plate and the cylinder block to move within the chamber, thereby realizing the change of the displacement of the axial piston hydraulic motor. The rear cover of the present disclosure simplifies the internal structure, reduces the processing cost, and improves the practicability. The axial piston hydraulic motor of the present disclosure can achieve precise variable displacement, and the motor displacement is precisely controllable, providing a new idea for the intelligent and digital development of hydraulic motors.

[0021] Other features and advantages of the present disclosure will become clear through the following detailed description of the exemplary embodiments of the present disclosure with reference to the accompanying drawings. Description of the Drawings

[0022] The accompanying drawings incorporated in and forming a part of this specification illustrate embodiments of the present disclosure and, together with the description thereof, serve to explain the principles of the present disclosure.

[0023] Figure 1 is a schematic structural diagram of an axial piston hydraulic motor of the present disclosure;

[0024] Figure 2 is a schematic sectional view of the rear cover of the present disclosure.

[0025] Figures 1 to 2 The one-to-one correspondence between the names of the components and the reference numerals in is as follows:

[0026] 1. Housing; 2. Rear cover; 201. Guide surface; 202. Piston hole; 203. Through hole; 3. Chamber; 4. Main shaft; 5. Cylinder block; 6. Valve plate; 7. Plunger; 8. Slide block; 9. Driving device; 901. Telescopic rod; 10. Pin; 11. Connecting rod. Detailed Description of the Invention

[0027] Now, various exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or its use. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be considered as part of the specification. It should be noted that: Similar reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings. In this document, "upper", "lower", "front", "rear", "left", "right", etc. are only used to represent the relative positional relationships between relevant parts, rather than to define the absolute positions of these relevant parts. In this document, "first", "second", etc. are only used for distinction from each other, rather than indicating importance, order, and the prerequisite for each other's existence, etc. In this document, "equal", "same", etc. are not strict mathematical and / or geometric limitations, and also include errors that can be understood by those skilled in the art and are allowed in manufacturing or using, etc.

[0028] The present disclosure provides an axial piston hydraulic motor, comprising: a housing, a rear cover, a main shaft, a cylinder block, a slider, and a driving device. The housing and the rear cover enclose a chamber. Wherein, a guiding surface is provided on the inner wall of the rear cover; the main shaft is rotatably connected to the housing; the cylinder block is configured to be guidingly fitted on the guiding surface of the rear cover and is configured to be able to slide along the guiding surface of the rear cover; a piston is arranged in the cylinder block and is in transmission connection with the main shaft, and the piston is configured to drive the main shaft to rotate when moving in the cylinder block. Hydraulic oil is introduced into the oil inlet pipeline of the rear cover. After the hydraulic oil passes through the oil inlet pipeline of the distribution plate communicated with the oil inlet pipeline of the rear cover, it is introduced into the cylinder block, so that the piston is acted on by the hydraulic oil, reciprocates in the cylindrical piston hole arranged in the cylinder block, and drives the cylinder block to rotate around the central axis. At the same time, the spherical head of the piston drives the main shaft to rotate. In addition, the hydraulic oil is discharged from the rear cover through the oil outlet pipeline.

[0029] The axial piston hydraulic motor of the present disclosure is provided with a slider and a driving device. The driving device drives the slider to move in the chamber, and the slider drives the cylinder block to move in the chamber, thereby realizing the displacement change of the axial piston hydraulic motor; the driving device can accurately control the position of the slider, and further accurately control the position of the cylinder block in the chamber, thereby realizing the accurate control of the displacement of the axial piston hydraulic motor, that is, accurately controlling the displacement change of the hydraulic motor. In addition, since the use of a variable piston and a complex control oil circuit are cancelled, the structure of the rear cover is more simplified, the production cost is lower, and the practicability is improved. The axial piston hydraulic motor of the present disclosure is more compatible with the intelligent application of construction machinery, providing a new idea for the development of digital hydraulic motors.

[0030] The following describes the specific embodiments of the present disclosure with reference to the accompanying drawings.

[0031] Combined with Figure 1 FIG. 1, an axial piston hydraulic motor provided by the present disclosure comprises: a housing 1, a rear cover 2, a chamber 3, a main shaft 4, a cylinder block 5, a piston 7, a slider 8, and a driving device 9. The housing 1 and the rear cover 2 enclose a chamber 3. Wherein, a guiding surface 201 is provided on the inner wall of the rear cover 2; the main shaft 4 is rotatably connected to the housing 1; the cylinder block 5 is configured to be guidingly fitted on the guiding surface 201 of the rear cover 2 and is configured to be able to slide along the guiding surface 201 of the rear cover 2; a piston 7 in transmission connection with the main shaft 4 is arranged in the cylinder block 5, and the piston 7 is configured to drive the main shaft 4 to rotate when moving in the cylinder block 5; the slider 8 is guidingly fitted on the rear cover 2 and is configured to be connected to the cylinder block 5; the driving device 9 is in transmission connection with the slider 8 and is configured to drive the slider 8 to drive the cylinder block 5 to move in the chamber 3.

[0032] During operation, hydraulic oil is introduced into the oil inlet line of the rear cover 2. After passing through the oil inlet line connected to the oil inlet line of the rear cover 2, the hydraulic oil is introduced into the cylinder body 5, so that the plunger 7 is acted upon by the hydraulic oil to reciprocate in the cylindrical plunger hole provided in the cylinder body 5, and drives the cylinder body 5 to rotate around the central axis. At the same time, the spherical head of the plunger 7 drives the main shaft 4 to rotate, that is, the axial piston hydraulic motor disclosed in the present invention relies on the reciprocating motion of the plunger 7 to change the volume in the cylinder body 5 to suck in and discharge the hydraulic oil.

[0033] In the prior art, a complex oil pipeline or working chamber is set at the rear cover of the axial piston hydraulic motor, and the piston is used to change the swing angle of the cylinder inside the shell to achieve displacement control of the axial piston hydraulic motor. However, this structure cannot accurately control the displacement of the axial piston hydraulic motor. Therefore, it is particularly important to seek an axial piston hydraulic motor that can achieve precise variables.

[0034] Combination Figure 1 In the present disclosure, the slider 8 is precisely controlled to move in the rear cover 2 by the driving device 9, and because the slider 8 is in transmission connection with the cylinder body 5, the driving device 9 can precisely control the cylinder body 5 to slide on the guide surface 201, that is, to achieve precise control of the displacement variable of the hydraulic motor, and no complex control oil circuit is provided in the rear cover 2, which simplifies the structure of the rear cover 2, reduces the production cost, and improves the practicality. The axial piston hydraulic motor disclosed in the present disclosure precisely controls the displacement change through the driving device, which is more compatible with the intelligent application of engineering machinery and provides a new idea for the development of digital hydraulic motors.

[0035] In one embodiment of the present disclosure, Figure 1 A distribution plate 6 is provided in the chamber 3 and is matched with the guide surface 201. The cylinder body 5 is configured to be mounted on the distribution plate 6, and the distribution plate 6 is configured to be in transmission connection with the slider 8. The distribution plate 6 is a device for controlling and distributing hydraulic oil. The distribution plate 6 is located between the rear cover 2 and the cylinder body 5, so as to control and distribute the hydraulic oil into the cylinder body 5. In addition, the slider 8 moves in the rear cover 2 to drive the distribution plate 6 to rotate. Since the distribution plate 6 is matched with the guide surface 201, the distribution plate 6 can slide along the guide surface 201, thereby adjusting the deflection angle of the cylinder body 5, so as to achieve the displacement change of the hydraulic motor.

[0036] In one embodiment of the present disclosure, Figure 1 , Figure 2 The rear cover 2 is provided with a piston hole 202, and the slider 8 is configured to move in the piston hole 202 to drive the valve plate 6 and the cylinder body 5 located on the valve plate 6 to move in the chamber 3. The piston hole 202 extends in the length direction of the rear cover 2 and provides a movement space for the slider 8, so that the slider 8 can move in the rear cover 2, thereby driving the valve plate 6 and the cylinder body 5 to move in the chamber 3, so as to realize the displacement change of the hydraulic motor.

[0037] In one embodiment of the present disclosure, in combination with Figure 1 , Figure 2 , the rear cover 2 is provided with a through hole 203 communicating the piston hole 202 with the chamber 3, and further includes a shift pin 10 passing through the through hole 203. One end of the shift pin 10 located in the piston hole 202 is configured to be fixedly connected to the slider 8, and the end located in the chamber 3 is configured to be movably connected to the flow distribution plate 6. The through hole 203 is provided in the middle part of the guide surface 201, facilitating the connection of the shift pin 10 with the slider 8 and the flow distribution plate 6 fitted on the guide surface 201. When the slider 8 makes a linear motion in the piston hole 202, the slider 8 drives the flow distribution plate 6 to swing in the chamber 3 through the shift pin 10, thereby realizing the change of the displacement of the hydraulic motor. Different from the complex control oil circuit of the prior art hydraulic motor, the rear cover 2 of the present disclosure simplifies the structure and reduces the processing cost, thus being more suitable for practical use.

[0038] In one embodiment of the present disclosure, the driving device 9 has a telescopic rod 901. A connecting rod 11 connecting the telescopic rod 901 and the slider 8 is arranged in the piston hole 202. The driving device 9 is configured to drive the telescopic rod 901 and drive the slider 8 to move in the piston hole 202 through the connecting rod 11. The telescopic rod 901 is directly driven by the driving device 9, and the telescopic rod 901 makes a telescopic motion to realize the change of the displacement of the hydraulic motor; the connecting rod 11 extends along the length direction, one end is fixedly connected to the telescopic rod 901, and the other end is fixedly connected to the slider 8, serving as a transmission component to regulate the position and movement track of the slider 8.

[0039] The telescopic rod 901 is arranged in the driving device 9, and the telescopic rod 901 is fixedly connected to the connecting rod 11 fixedly connected to the slider 8. That is, the driving device 9 drives the slider 8 to slide in the piston hole 202 of the rear cover 2 through the telescopic motion of the telescopic rod 901, thereby driving the flow distribution plate 6 and the cylinder block 5 to swing in the housing 1 to realize the change of the displacement. Different from the complex control oil circuit in the prior art, the present disclosure drives the slider 8 to slide in the rear cover 2 through the driving device 9 to realize the change of the displacement of the hydraulic motor, improving the working efficiency.

[0040] In one embodiment of the present disclosure, a sensor is provided on the drive device 9, and the sensor is configured to detect the extension amount of the telescopic rod 901. It is common general knowledge in the art to set the sensor on the drive device 9 to detect the telescopic amount. For example, when the drive device 9 is a motor, the sensor can be an encoder, etc. When the drive device 9 is an electric cylinder, the sensor can be a displacement sensor, which can directly measure the extension amount of the electric cylinder. When the telescopic rod 901 extends, it can drive the flow distribution plate 6 to move in the chamber 3 to change the displacement of the hydraulic motor. Therefore, the parameters of the drive device 9 obtained by the sensor can be used to characterize the displacement of the hydraulic motor. Through the built-in sensor on the drive device 9 of the present disclosure, the extension amount of the telescopic rod 901 can be detected in real time, that is, the displacement size of the hydraulic motor can be fed back in real time, which is convenient for accurately controlling the displacement change of the hydraulic motor. In addition, the drive device 9 has mature technology, low cost, is easy to purchase, and has strong applicability.

[0041] In one embodiment of the present disclosure, a control unit is included. The control unit is configured to be communicatively connected to the sensor and the drive device. The control unit is configured to control the drive device 9 to drive the telescopic rod 901 to move to a predetermined position based on the sensor. The sensor feeds back the displacement change of the hydraulic motor in real time. When the displacement of the hydraulic motor deviates from the predetermined value or needs to be adjusted, the extension amount of the telescopic rod 901 of the drive device 9 can be adjusted through the control unit, so as to achieve accurate variable displacement of the hydraulic motor. The axial piston hydraulic motor of the present disclosure matches the intelligent application of construction machinery, provides a new idea for the development of digital hydraulic motors, and is more suitable for practical use.

[0042] In one embodiment of the present disclosure, a mechanical locking device is provided in the drive device 9, and the mechanical locking device is configured to mechanically lock the telescopic rod 901. When the displacement of the hydraulic motor is the required displacement, the telescopic rod 901 can be fixed through the mechanical locking device, so as to fix the position of the slider 8 in the piston hole 202 and prevent the displacement of the hydraulic motor from changing. The mechanical locking device in the drive device 9 is common general knowledge in the art and will not be specifically described herein.

[0043] In a specific embodiment of the present disclosure, the drive device 9 is a servo electric cylinder. By driving the telescopic rod 901 with a servo electric cylinder, due to the use of an electric motor drive, high precision and programmability are provided, and high-precision position control and motion trajectory planning can be performed on the telescopic rod 901 and the slider 8, so as to achieve high-precision control of the displacement of the hydraulic motor.

[0044] In a specific embodiment of the present disclosure, the drive device 9 is a servo oil cylinder. The telescopic rod 901 is driven by the servo oil cylinder through a hydraulic system, so as to control the position of the slider 8, and further achieve accurate variable displacement of the hydraulic motor. In addition, the servo oil cylinder has strong load-bearing capacity and is suitable for high-power application scenarios.

[0045] The embodiments of the present disclosure have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to technologies in the market, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. An axial piston hydraulic motor, characterized in that: include: A shell (1) and a rear cover (2), wherein the shell (1) and the rear cover (2) enclose a chamber (3), wherein a guide surface (201) is provided on the inner wall of the rear cover (2); A main shaft (4), the main shaft (4) being rotatably connected to the housing (1); A cylinder body (5), the cylinder body (5) being configured to be guided and matched on the guide surface (201) of the rear cover (2), and being configured to be able to slide along the guide surface (201) of the rear cover (2); a plunger (7) drivingly connected to the main shaft (4) is arranged in the cylinder body (5), and the plunger (7) is configured to drive the main shaft (4) to rotate when moving in the cylinder body (5); A slider (8), the slider (8) is guided and matched on the rear cover (2) and is configured to be drivingly connected to the cylinder body (5); A driving device (9) is connected to the slider (8) in a transmission manner and is configured to drive the slider (8) to drive the cylinder body (5) to move in the chamber (3).

2. The axial piston hydraulic motor according to claim 1, characterized in that: A distribution plate (6) is provided in the chamber (3) and is in guiding cooperation with the guide surface (201); the cylinder body (5) is configured to be mounted on the distribution plate (6); and the distribution plate (6) is configured to be in transmission connection with the slider (8).

3. The axial piston hydraulic motor according to claim 2, characterized in that: The rear cover (2) is provided with a piston hole (202), and the slider (8) is configured to move in the piston hole (202) to drive the distribution plate (6) and the cylinder body (5) located on the distribution plate (6) to move in the chamber (3).

4. The axial piston hydraulic motor according to claim 3, characterized in that: The rear cover (2) is provided with a through hole (203) connecting the piston hole (202) and the chamber (3), and also includes a pin (10) passing through the through hole (203), wherein one end of the pin (10) located in the piston hole (202) is configured to be fixedly connected to the slider (8), and the other end located in the chamber (3) is configured to be movably connected to the distribution plate (6).

5. The axial piston hydraulic motor according to claim 3, characterized in that: The driving device (9) has a telescopic rod (901), and a connecting rod (11) connecting the telescopic rod (901) and the slider (8) is arranged in the piston hole (202). The driving device (9) is configured to drive the telescopic rod (901) and drive the slider (8) to move in the piston hole (202) via the connecting rod (11).

6. The axial piston hydraulic motor according to claim 5, characterized in that: The driving device (9) is provided with a sensor, and the sensor is configured to detect the extension amount of the telescopic rod (901).

7. The axial piston hydraulic motor according to claim 6, characterized in that: It comprises a control unit, the control unit is configured to be in communication connection with the sensor and the driving device, and the control unit is configured to control the driving device (9) based on the sensor to drive the telescopic rod (901) to move to a predetermined position.

8. The axial piston hydraulic motor according to claim 5, characterized in that: A mechanical locking device is provided in the driving device (9), and the mechanical locking device is configured to mechanically lock the telescopic rod (901).

9. The axial piston hydraulic motor according to claim 1, characterized in that: The driving device (9) is a servo electric cylinder.

10. The axial piston hydraulic motor according to claim 1, characterized in that: The driving device (9) is a servo cylinder.

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