Variable control mechanism of novel hydraulic motor

Abstract

The invention provides a variable control mechanism of a novel hydraulic motor. The variable control mechanism comprises a direct-current servo motor installed on the hydraulic motor and a lead screw assembly located in the hydraulic motor and driven by the direct-current servo motor. The lead screw assembly comprises a valve sleeve installed in the hydraulic motor, a lead screw used for controlling the opening and closing degree of the first oil inlet is arranged in the valve sleeve, and a motor swing angle driving cylinder capable of moving in the hydraulic motor under the action that the lead screw controls the opening and closing degree of the first oil inlet is arranged on the outer surface of the valve sleeve. The hydraulic motor has the following beneficial effects that the direct-current servo motor drives the lead screw to rotate, the opening degree of a first oil inlet in the valve sleeve and the opening degree of a second oil outlet in the motor swing angle driving cylinder can be controlled, and the motor swing angle driving cylinder can move in the hydraulic motor; therefore, the shifting block can shift the motor swash plate to adjust the displacement of the hydraulic motor so as to achieve the purpose of randomly controlling the displacement of the motor.

Description

Technical Field

[0001] The invention relates to the field of hydraulic technology, in particular to a novel variable control mechanism of a hydraulic motor. Background Art

[0002] At present, the function of hydraulic motors is too single, and each working condition often corresponds to a motor, which greatly increases the selection difficulty when designing various hydraulic non-standard equipment, and also increases the cost of research and development trial and error of various hydraulic equipment. In addition, the adjustment of the inclination angle of the hydraulic motor swash plate on the market is divided into manual adjustment and proportional electromagnet adjustment. The former not only has poor adjustment accuracy, but also cannot form a closed-loop control with the electronic control system, which often brings problems such as excessive energy consumption, serious heating, low work efficiency, and shortened life to the equipment. The latter has a more complex structure, requires higher technology, and is difficult to maintain in the later stage, and the cost is relatively high. Among them, variable motors mostly use proportional electromagnets to drive the swash plate, which often brings inconvenience to the maintenance of the motor, and the stability is worse than that of the mechanical structure. The present invention adopts a mechanical structure to adjust the inclination angle of the swash plate, which has high stability and a lower failure rate than the electromagnet, and is convenient for later maintenance. The present invention can not only adjust the displacement of the hydraulic motor by adjusting the inclination angle of the hydraulic motor swash plate, but also can accurately switch the working conditions of the motor under actual use conditions. Summary of the invention

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a novel variable control mechanism for a hydraulic motor, which is used to solve the problem that the prior art cannot accurately switch the working conditions of the motor under actual working conditions, and the adjustment of the inclination angle of the existing hydraulic motor swash plate not only has poor adjustment accuracy but also has a relatively complex structure.

[0004] To achieve the above objectives and other related objectives, the present invention provides the following technical solutions:

[0005] A novel variable control mechanism for a hydraulic motor comprises a DC servo motor mounted on the hydraulic motor and a screw assembly located in the hydraulic motor and driven by the DC servo motor;

[0006] The screw rod assembly includes a valve sleeve installed in the hydraulic motor, the valve sleeve is provided with a plurality of first oil inlets, the valve sleeve is provided with a screw rod for controlling the opening and closing size of the first oil inlets, the outer surface of the valve sleeve is provided with a motor swing angle drive cylinder which can be moved in the hydraulic motor under the action of the screw rod controlling the opening and closing size of the first oil inlets, and the outer surface of the motor swing angle drive cylinder is threadedly connected with a shift block for adjusting the inclination angle of the motor swash plate; this technical solution drives the screw rod to rotate through a DC servo motor, so as to control the opening and closing size of the first oil inlet on the valve sleeve and the second oil outlet on the motor swing angle drive cylinder described below, so as to enable the motor swing angle drive cylinder to move in the hydraulic motor, so as to enable the shift block to shift the motor swash plate to adjust the displacement of the hydraulic motor.

[0007] In one embodiment of the present invention, the DC servo motor is connected to an external controller via a wire or a network, and an information acquisition sensor is also installed on the hydraulic motor. The information acquisition sensor is connected to the external controller via a wire or a network, and the external controller is provided with corresponding algorithms under different working conditions according to the information collected by the information acquisition sensor; the external controller in this technical solution sets the corresponding algorithms under different working conditions according to the information collected by the information acquisition sensor, so the corresponding algorithms can be used to drive the DC servo motor to operate under different working conditions, and the working conditions of the hydraulic motor can be accurately switched under the actual use conditions under the action of the screw rod controlling the opening and closing size of the first oil inlet.

[0008] In one embodiment of the present invention, one end of the valve sleeve is provided with a through hole for the screw rod to pass through, and the other end of the valve sleeve is installed in the hydraulic motor through a screw plug.

[0009] In one embodiment of the present invention, one end of the screw rod is connected to a connecting rod integrally formed with the screw rod, one end of the connecting rod is connected to a transmission shaft via a first coupling, and the transmission shaft is connected to the output shaft of the DC servo motor via a second coupling.

[0010] In one embodiment of the present invention, a first fixing sleeve is provided on the outer surface of the connection between the connecting rod and the transmission shaft, a second fixing sleeve is provided on the outer surface of the connection between the transmission shaft and the output shaft of the DC servo motor, and a one-way thrust ball bearing is also installed on the surface of the transmission shaft between the first fixing sleeve and the second fixing sleeve.

[0011] In one embodiment of the present invention, the motor swing angle drive cylinder includes a first sleeve for the screw rod and the connecting rod to pass through, and a second sleeve for placing the valve sleeve and integrally formed with the first sleeve. The connection between the first sleeve and the second sleeve is threadedly connected to the shift block, and the hydraulic motor is also provided with a spring for restoring the shift block to its original position.

[0012] In one embodiment of the present invention, a plurality of second oil inlets evenly distributed along the circumferential direction are opened on the circumferential side surface of the second sleeve close to the shift block corresponding to the first oil inlet, and the second oil inlet is connected to the second hydraulic oil chamber in the hydraulic motor.

[0013] In one embodiment of the present invention, the end of the first sleeve away from the second sleeve is provided with a first oil outlet for the connecting rod to pass through and connected to the first hydraulic oil chamber in the hydraulic motor, and the side surface of the end of the first sleeve away from the second sleeve is provided with a second oil outlet connected to the first oil outlet and can be connected to the second hydraulic oil chamber in the hydraulic motor under the movement of the motor swing angle drive cylinder.

[0014] As described above, the novel variable control mechanism of the hydraulic motor of the present invention has the following beneficial effects:

[0015] The external controller in the present invention sets corresponding algorithms under different working conditions according to the information collected by the information collection sensor, so the corresponding algorithms can be used to drive the DC servo motor to operate under different working conditions, so that the working conditions of the hydraulic motor can be accurately switched under actual use conditions; by driving the lead screw to rotate by the DC servo motor, the opening and closing size of the first oil inlet on the valve sleeve and the second oil outlet on the motor swing angle drive cylinder can be controlled, and the motor swing angle drive cylinder can be moved in the hydraulic motor, so that the shift block can shift the motor swash plate to adjust the displacement of the hydraulic motor, so as to achieve the purpose of arbitrarily controlling the motor displacement. Therefore, the present invention not only has high adjustment accuracy and high stability, but also has a simple structure, low process requirements, and simple later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a left front perspective schematic diagram of a variable control mechanism of a novel hydraulic motor disclosed in an embodiment of the present invention;

[0017] Figure 2 It is a front cross-sectional schematic diagram of a variable control mechanism of a novel hydraulic motor disclosed in an embodiment of the present invention;

[0018] Figure 3 It is a front cross-sectional schematic diagram of a screw rod assembly in a variable control mechanism of a novel hydraulic motor disclosed in an embodiment of the present invention;

[0019] Figure 4 Shown is a three-dimensional schematic diagram of a valve sleeve in a variable control mechanism of a novel hydraulic motor disclosed in an embodiment of the present invention;

[0020] Figure 5 Shown is a three-dimensional schematic diagram of a screw rod and a connecting rod in a variable control mechanism of a novel hydraulic motor disclosed in an embodiment of the present invention;

[0021] Figure 6 It is a front perspective schematic diagram of a motor swing angle driving cylinder in a variable control mechanism of a novel hydraulic motor disclosed in an embodiment of the present invention;

[0022] Figure 7 It is a left front perspective schematic diagram of a motor swing angle drive cylinder in a variable control mechanism of a novel hydraulic motor disclosed in an embodiment of the present invention;

[0023] Figure 8 Shown is a front cross-sectional schematic diagram of a variable control mechanism of a novel hydraulic motor disclosed in an embodiment of the present invention installed in a hydraulic motor.

[0024] Component number description

[0025] 1. DC servo motor; 2. Second fixed sleeve; 3. One-way thrust ball bearing; 4. First fixed sleeve; 5. Screw assembly; 501. Valve sleeve; 502. Screw; 503. Motor swing angle drive cylinder; 5031. First sleeve; 5032. Second sleeve; 6. Shift block; 7. Screw plug; 8. Connecting rod; 9. First coupling; 10. Transmission shaft; 11. Second coupling; 12. Wave washer; 13. Wire retaining ring for shaft; 14. Gly ring for shaft; 15. First oil inlet; 16. Second oil inlet; 17. First oil outlet; 18. Second oil outlet; 19. Through port; 20. Hydraulic motor; 21. First hydraulic oil chamber; 22. Second hydraulic oil chamber. DETAILED DESCRIPTION

[0026] The following specific embodiments illustrate the implementation of the present invention, and those familiar with the technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0027] See also Figure 1 and Figure 8The present invention provides a novel variable control mechanism of a hydraulic motor, comprising a DC servo motor 1 installed on a hydraulic motor 20 and a screw assembly 5 located in the hydraulic motor 20 and driven by the DC servo motor 1, wherein the DC servo motor 1 is fixedly connected to the hydraulic motor 20 by a hexagon socket screw, and the DC servo motor 1 is connected to an external controller by a wire or a network. An information acquisition sensor is also installed on the hydraulic motor 20, and the information acquisition sensor is connected to the external controller by a wire or a network, and the external controller is provided with corresponding algorithms under different working conditions according to the information collected by the information acquisition sensor, and during actual installation, a sealing ring and a retaining ring are installed on the outer surface of the screw assembly 5 according to actual needs; the corresponding algorithms under different working conditions are set by the external controller according to the information collected by the information acquisition sensor, so the corresponding algorithms can be used to drive the DC servo motor 1 to operate under different working conditions, and the screw 502 in the following text controls the opening and closing size of the first oil inlet 15, so that the working condition of the hydraulic motor 20 can be accurately switched under actual use conditions.

[0028] exist Figures 2 to 5 In the embodiment, the screw rod assembly 5 includes a valve sleeve 501 installed in the hydraulic motor 20, and a plurality of first oil inlets 15 are provided on the valve sleeve 501. In this embodiment, the number of the first oil inlets 15 is four, and the four first oil inlets 15 are symmetrically arranged in groups of two on the valve sleeve 501; a screw rod 502 for controlling the opening and closing size of the first oil inlet 15 is provided in the valve sleeve 501, wherein a spiral pattern is provided on the surface of the screw rod 502, and the protrusion of the spiral pattern is used to block the first oil inlet 15, and the concave of the spiral pattern is used for the high-pressure oil entering from the first oil inlet 15 to flow into the first sleeve 5031 described below; the valve sleeve 5 One end of the valve sleeve 501 is provided with a through hole 19 for the screw rod 502 to pass through, and the other end of the valve sleeve 501 is installed in the hydraulic motor 20 through the hexagon socket screw plug 7, wherein the hexagon socket screw plug 7 can not only fix the valve sleeve 501 in the hydraulic motor 20, but also seal the valve sleeve 501; one end of the screw rod 502 is connected to a connecting rod 8 integrally formed with the screw rod 502, one end of the connecting rod 8 is connected to a transmission shaft 10 through a first coupling 9, and the transmission shaft 10 is connected to the output shaft of the DC servo motor 1 through a second coupling 11, wherein the first coupling 9 and the second coupling 11 are both cross valve block couplings;

[0029] exist Figure 1 and Figure 2In the figure, a first fixing sleeve 4 is provided on the outer surface of the connection between the connecting rod 8 and the transmission shaft 10, wherein the first fixing sleeve 4 is a protective sleeve, the connecting rod 8 is connected to the first fixing sleeve 4 through a wave washer 12, and the transmission shaft 10 is connected to the first fixing sleeve 4 through a shaft wire retaining ring 13; a second fixing sleeve 2 is provided on the outer surface of the connection between the transmission shaft 10 and the output shaft of the DC servo motor 1, wherein the second fixing sleeve 2 is a fastening nut, and the surface of the end of the transmission shaft 10 away from the connecting rod 8 is connected to the second fixing sleeve 2 through a shaft grid ring 14; a one-way thrust ball bearing 3 is also installed on the surface of the transmission shaft 10 and is located between the first fixing sleeve 4 and the second fixing sleeve 2.

[0030] exist Figure 3 , Figure 6 and Figure 7 In the embodiment, the outer surface of the valve sleeve 501 is provided with a motor swing angle driving cylinder 503 which can move in the hydraulic motor 20 under the action of the screw rod 502 controlling the opening and closing size of the first oil inlet 15, and the outer surface of the motor swing angle driving cylinder 503 is threadedly connected with a shifting block 6 for adjusting the inclination angle of the motor swash plate; the motor swing angle driving cylinder 503 includes a first sleeve 5031 for the screw rod 502 and the connecting rod 8 to pass through and a second sleeve 5032 for placing the valve sleeve 501 and integrally formed with the first sleeve 5031, the connection between the first sleeve 5031 and the second sleeve 5032 is threadedly connected with the shifting block 6, and the hydraulic motor 20 is also provided with a spring for restoring the shifting block 6 to its original position;

[0031] A plurality of second oil inlets 16 evenly distributed along the circumferential direction are provided on the circumferential side surface of the second sleeve 5032 close to the shift block 6 corresponding to the first oil inlet 15, wherein in the present embodiment, the number of the second oil inlets 16 is also four, and the second oil inlet 16 is communicated with the second hydraulic oil chamber 22 in the hydraulic motor 20; a first oil outlet 17 for the connecting rod 8 to pass through and communicated with the first hydraulic oil chamber 21 in the hydraulic motor 20 is provided at the end of the first sleeve 5031 away from the second sleeve 5032, and a second oil outlet 18 is provided on the side surface of the end of the first sleeve 5031 away from the second sleeve 5032, which is communicated with the first oil outlet 17 and can be communicated with the second hydraulic oil chamber 22 in the hydraulic motor 20 under the movement of the motor swing angle drive cylinder 503, wherein the number of the second oil outlet 18 is two, and the two second oil outlets 18 are symmetrically arranged on the second sleeve 5032.

[0032] Specifically, when the variable control mechanism of the new hydraulic motor is used, the external controller drives the DC servo motor 1 to operate according to the information collected by the information collection sensor using the corresponding algorithm under the working condition, and the DC servo motor 1 drives the screw rod 502 to rotate slowly, so that the helical protrusion on the screw rod 502 that blocks the first oil inlet 15 rotates slowly, so that the first oil inlet 15 can be slowly opened, and the high-pressure oil in the second hydraulic oil chamber 22 in the hydraulic motor 20 enters the first oil inlet 15 through the second oil inlet 16, and then through The opened first oil inlet 15 enters the valve sleeve 501, then enters the first sleeve 5031 of the motor swing angle drive cylinder 503 along the depression on the spiral pattern of the screw rod 502, and then flows into the first hydraulic oil chamber 21 in the hydraulic motor 20 through the first oil outlet 17 on the motor swing angle drive cylinder 503. As the high-pressure oil in the second hydraulic oil chamber 22 in the hydraulic motor 20 increases, the high-pressure oil will push the motor swing angle drive cylinder 503 to move, thereby driving the shift block 6 to adjust the inclination angle of the motor swash plate, so as to achieve the purpose of arbitrarily controlling the motor displacement;

[0033] When the motor swing angle drive cylinder 503 moves to the second oil outlet 18 and is connected to the second hydraulic oil chamber 22 in the hydraulic motor 20, the DC servo motor 1 adjusts the screw rod 502 to close the first oil inlet 15, and the high-pressure oil in the first hydraulic oil chamber 21 in the hydraulic motor 20 flows into the second hydraulic oil chamber 22 in the hydraulic motor 20 through the second oil outlet 18, and under the action of the spring, the shift block 6 and the motor swing angle drive cylinder 503 return to their original positions, and the inclination angle of the cylinder swash plate is adjusted; it should be further explained that when the screw rod 502 does not rotate, the high-pressure port P, the return oil T and the spiral groove on the valve core are all blocked, and they remain in their original positions and do not move, and the hydraulic motor 20 works as a fixed displacement pump.

[0034] In summary, the external controller in the present invention sets the corresponding algorithm under different working conditions according to the information collected by the information collection sensor, so the corresponding algorithm can be used to drive the DC servo motor 1 to operate under different working conditions, so that the working condition of the hydraulic motor 20 can be accurately switched under actual use conditions, which reduces the selection difficulty when designing various hydraulic non-standard equipment, and also reduces the research and development trial and error cost of various hydraulic equipment; by driving the screw rod 502 to rotate by the DC servo motor 1, the opening and closing size of the first oil inlet 15 on the valve sleeve 501 and the second oil outlet 18 on the motor swing angle drive cylinder 503 can be controlled, so that the motor swing angle drive cylinder 503 can be moved in the hydraulic motor 20, so that the shift block 6 can shift the motor swash plate to adjust the displacement of the hydraulic motor 20, so the present invention not only has high adjustment accuracy, but also can form a closed-loop control with the electronic control system, which solves the problems of excessive energy consumption, severe heat generation, low working efficiency and shortened life of the equipment, and the present invention has a simple structure, low process requirements, and simple later maintenance, which is convenient for promotion and use.

[0035] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. All equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A novel variable control mechanism for a hydraulic motor, characterized in that: It comprises a DC servo motor (1) mounted on a hydraulic motor (20) and a screw assembly (5) located in the hydraulic motor (20) and driven by the DC servo motor (1); The screw assembly (5) comprises a valve sleeve (501) installed in the hydraulic motor (20), the valve sleeve (501) being provided with a plurality of first oil inlets (15), the valve sleeve (501) being provided with a screw (502) for controlling the opening and closing size of the first oil inlets (15), the outer surface of the valve sleeve (501) being provided with a motor swing angle drive cylinder (503) which can move in the hydraulic motor (20) under the action of the screw (502) controlling the opening and closing size of the first oil inlets (15), the outer surface of the motor swing angle drive cylinder (503) being threadedly connected with a shift block (6) for adjusting the inclination angle of the motor swash plate.

2. A novel variable control mechanism for a hydraulic motor according to claim 1, characterized in that: The DC servo motor (1) is connected to an external controller via a wire or a network, and an information acquisition sensor is also installed on the hydraulic motor (20). The information acquisition sensor is connected to the external controller via a wire or a network, and the external controller is provided with corresponding algorithms under different working conditions according to information collected by the information acquisition sensor.

3. A novel variable control mechanism for a hydraulic motor according to claim 1, characterized in that: One end of the valve sleeve (501) is provided with a through hole (19) for the screw rod (502) to pass through, and the other end of the valve sleeve (501) is installed in the hydraulic motor (20) via a screw plug (7).

4. A novel variable control mechanism for a hydraulic motor according to claim 1, characterized in that: One end of the screw rod (502) is connected to a connecting rod (8) integrally formed with the screw rod (502); one end of the connecting rod (8) is connected to a transmission shaft (10) via a first coupling (9); and the transmission shaft (10) is connected to an output shaft of the DC servo motor (1) via a second coupling (11).

5. A novel variable control mechanism for a hydraulic motor according to claim 4, characterized in that: A first fixing sleeve (4) is provided on the outer surface of the connection between the connecting rod (8) and the transmission shaft (10), a second fixing sleeve (2) is provided on the outer surface of the connection between the transmission shaft (10) and the output shaft of the DC servo motor (1), and a one-way thrust ball bearing (3) located between the first fixing sleeve (4) and the second fixing sleeve (2) is also installed on the surface of the transmission shaft (10).

6. A novel variable control mechanism for a hydraulic motor according to claim 1, characterized in that: The motor swing angle drive cylinder (503) comprises a first sleeve (5031) for the screw rod (502) and the connecting rod (8) to pass through, and a second sleeve (5032) for accommodating the valve sleeve (501) and integrally formed with the first sleeve (5031), the connection between the first sleeve (5031) and the second sleeve (5032) being threadedly connected to the shift block (6), and a spring for returning the shift block (6) to its original position is also provided in the hydraulic motor (20).

7. A novel variable control mechanism for a hydraulic motor according to claim 6, characterized in that: A plurality of second oil inlets (16) evenly distributed along the circumferential direction are provided on the circumferential side surface of the second sleeve (5032) close to the shift block (6) and corresponding to the first oil inlet (15), and the second oil inlet (16) is communicated with the second hydraulic oil chamber (22) in the hydraulic motor (20).

8. A novel variable control mechanism for a hydraulic motor according to claim 6, characterized in that: The end of the first sleeve (5031) away from the second sleeve (5032) is provided with a first oil outlet (17) for the connecting rod (8) to pass through and connected to the first hydraulic oil chamber (21) in the hydraulic motor (20); and the side surface of the end of the first sleeve (5031) away from the second sleeve (5032) is provided with a second oil outlet (18) connected to the first oil outlet (17) and capable of being connected to the second hydraulic oil chamber (22) in the hydraulic motor (20) under the movement of the motor swing angle drive cylinder (503).

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