A digital hydraulic motor and driving device

Abstract

The embodiment of the present invention provides a digital hydraulic motor and a driving device, which relates to the field of engineering machinery. The digital hydraulic motor includes a motor body, an output shaft, a driving cylinder, a valve housing, a valve core and a transmission member. The output shaft is rotatably arranged on the motor body, the piston rod of the driving cylinder is transmission-connected to one end of the output shaft, the valve core is movably arranged in the valve housing, the piston rod of the driving cylinder is used to drive the output shaft to rotate under the action of hydraulic oil flowing from the inner cavity of the valve housing to the inner cavity of the driving cylinder when the inner cavity of the valve housing is connected to the inner cavity of the driving cylinder, the end of the output shaft away from the piston rod of the driving cylinder passes through the motor body, and is transmission-connected to the valve core through the transmission member, the output shaft is used to drive the valve core to move through the transmission member when driven by the piston rod, so that the inner cavity of the valve housing is disconnected from the inner cavity of the driving cylinder. The digital hydraulic motor and the driving device can effectively improve the accuracy of the rotation angle and rotation speed of the output shaft.

Description

Technical Field

[0001] The present invention relates to the field of engineering machinery, and in particular to a digital hydraulic motor and a driving device. Background Art

[0002] As a hydraulic actuator, the hydraulic motor can convert hydraulic energy into mechanical energy and perform work. It has a large power-to-weight ratio and can adapt to rotary motion driving under heavy load conditions.

[0003] With the continuous advancement of industrial technology, the requirements for automation and intelligence of industrial production processes are also increasing. The control requirements of various actions on complex production lines also put forward higher requirements for the accuracy, controllability, digitization and intelligence of actuators. In practical applications, more and more applications require servo control of the angle and speed of the output shaft of the hydraulic motor, which is easy to integrate with other control systems. Traditional digital hydraulic motors control the angle and speed of the output shaft of the hydraulic motor through pulse signals. The error of the control angle and speed is large and the accuracy is not high. Summary of the invention

[0004] The object of the present invention is to provide a digital hydraulic motor and a driving device, which can effectively improve the above-mentioned technical problems.

[0005] The embodiment of the present invention is achieved as follows:

[0006] In a first aspect, an embodiment of the present invention provides a digital hydraulic motor, comprising a motor body, an output shaft, a drive cylinder, a valve housing, a valve core and a transmission member, wherein the output shaft is rotatably disposed on the motor body, and a piston rod of the drive cylinder is transmission-connected to one end of the output shaft;

[0007] The valve core is movably arranged in the valve housing so that the inner cavity of the valve housing is connected to or disconnected from the inner cavity of the driving cylinder;

[0008] The piston rod of the driving cylinder is used to drive the output shaft to rotate under the action of the hydraulic oil flowing from the inner cavity of the valve housing to the inner cavity of the driving cylinder when the inner cavity of the valve housing is connected to the inner cavity of the driving cylinder, and is used to stop driving the output shaft to rotate when the inner cavity of the valve housing is disconnected from the inner cavity of the driving cylinder;

[0009] One end of the output shaft away from the piston rod of the driving cylinder passes through the motor body and is connected to the valve core through the transmission member. The output shaft is used to drive the valve core to move through the transmission member when driven by the piston rod, so as to disconnect the inner cavity of the valve housing from the inner cavity of the driving cylinder.

[0010] In an optional embodiment, the transmission member includes a lead screw and a sleeve mounted on the lead screw, one end of the lead screw is rotatably connected to the motor body, the other end of the lead screw is transmission-connected to one end of the output shaft passing through the motor body, the sleeve is connected to the valve core, and the sleeve is used to move along the axial direction of the lead screw when the lead screw is rotated by the output shaft, and drive the valve core to move, so that the inner cavity of the valve housing is disconnected from the inner cavity of the drive cylinder.

[0011] In an optional embodiment, an end of the lead screw away from the motor body and an end of the output shaft passing through the motor body are respectively located on two opposite sides of the motor body;

[0012] The digital hydraulic motor further comprises a mounting frame arranged on the motor body, and the transmission member further comprises a transmission shaft, and the transmission shaft is rotatably connected to the mounting frame;

[0013] One end of the transmission shaft passes through the installation frame and is in driving connection with one end of the output shaft passing through the motor body, and the other end of the transmission shaft passes through the installation frame and is in driving connection with the lead screw;

[0014] The output shaft is used to drive the lead screw to rotate under the drive of the transmission shaft.

[0015] In an optional embodiment, the transmission member also includes a first gear, a second gear, a third gear and a fourth gear, the first gear and the second gear are respectively sleeved on both ends of the transmission shaft, the third gear is sleeved on the end of the output shaft passing through the motor body, the third gear is meshed with the first gear, the fourth gear is sleeved on the end of the screw away from the motor body, and the fourth gear is meshed with the second gear.

[0016] In an optional embodiment, the number of the valve cores and the number of the driving cylinders are both multiple and correspond one to one. The multiple valve cores are arranged on the screw sleeve at circumferential intervals along the screw sleeve. The screw sleeve is used to drive the multiple valve cores to move at the same time, so that the piston rods of the multiple driving cylinders drive the output shaft to rotate at the same time.

[0017] In an optional embodiment, the digital hydraulic motor further includes a swash plate, the swash plate is located in the motor body, and the swash plate is sleeved on the output shaft, and the piston rod acts on the swash plate to drive the output shaft to rotate.

[0018] In an optional embodiment, there are multiple drive cylinders, and the piston rods of the multiple drive cylinders act on the swash plate simultaneously to drive the output shaft to rotate, and the piston rods of the multiple drive cylinders are distributed at intervals along the circumference of the swash plate.

[0019] In an optional embodiment, the digital hydraulic motor further includes a drive motor and a connecting member, wherein the drive motor is transmission-connected to the valve core via the connecting member to drive the valve core to move, thereby connecting the inner cavity of the valve housing with the inner cavity of the drive cylinder.

[0020] In an optional embodiment, the digital hydraulic motor also includes a first universal coupling, one end of the connecting member is threadedly connected to the rotating shaft of the driving motor, and the other end of the connecting member is connected to the valve core through the first universal coupling, and the connecting member is used to drive the valve core to move under the action of the driving motor so that the inner cavity of the valve housing is connected to the inner cavity of the driving cylinder.

[0021] In a second aspect, an embodiment of the present invention provides a driving device, comprising the digital hydraulic motor described in any one of the aforementioned embodiments.

[0022] The beneficial effects of the embodiments of the present invention include, for example:

[0023] The embodiment of the present invention provides a digital hydraulic motor, which includes a motor body, an output shaft, a drive cylinder, a valve housing, a valve core and a transmission member. The valve core moves relative to the valve housing, so that the inner cavity of the valve housing is connected to the inner cavity of the drive cylinder, and the hydraulic oil flows from the inner cavity of the valve housing to the inner cavity of the drive cylinder, driving the piston rod of the drive cylinder to move, and the piston rod drives the output shaft to rotate relative to the motor body. When the output shaft rotates relative to the motor body, the valve core is driven to move relative to the valve housing through the transmission member, so that the inner cavity of the valve housing is disconnected from the inner cavity of the drive cylinder, the piston cylinder stops moving, and the output shaft stops rotating. Mechanical feedback is provided between the output shaft and the valve core, so that after the output shaft rotates for a certain time and a certain angle, the valve core can be moved in time, and the inner cavity of the valve housing and the inner cavity of the drive cylinder can be disconnected in time, so that the output shaft itself stops rotating in time. In this way, the accuracy of the rotation angle and rotation speed of the output shaft can be effectively improved.

[0024] An embodiment of the present invention further provides a driving device, which includes the digital hydraulic motor mentioned above and has all the functions of the digital hydraulic motor. The driving device also has the beneficial effect of improving the accuracy of the output shaft rotation angle and rotation speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A structural schematic diagram of a digital hydraulic motor provided by an embodiment of the present invention;

[0027] Figure 2 for Figure 1 Schematic diagram of the local structure in;

[0028] Figure 3 A cross-sectional view of a digital hydraulic motor provided in an embodiment of the present invention.

[0029] Icons: 1-digital hydraulic motor; 11-motor body; 12-output shaft; 13-drive cylinder; 131-piston rod; 132-first oil inlet; 133-second oil inlet; 14-valve housing; 141-first oil outlet; 15-valve core; 16-transmission member; 161-screw; 162-screw sleeve; 163-transmission shaft; 164-bearing; 165-first gear; 166-second gear; 167-third gear; 168-fourth gear; 17-mounting frame; 18-swash plate; 19-drive motor; 20-connecting member; 21-transition block; 22-first universal joint; 23-second universal joint; 24-slipper; 25-connecting rod. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Please refer to Figure 1 and Figure 2 The present embodiment provides a digital hydraulic motor 1, which includes a motor body 11, an output shaft 12, a drive cylinder 13, a valve housing 14, a valve core 15 and a transmission member 16. The output shaft 12 is rotatably disposed on the motor body 11, and a piston rod 131 of the drive cylinder 13 is transmission-connected to one end of the output shaft 12. The valve core 15 is movably disposed in the valve housing 14. When the valve core 15 moves relative to the valve housing 14, the inner cavity of the valve housing 14 can be connected or disconnected with the inner cavity of the drive cylinder 13.

[0037] Specifically, in this embodiment, the valve core 15 moves relative to the valve housing 14, so that the inner cavity of the valve housing 14 is connected with the inner cavity of the driving cylinder 13, and the hydraulic oil flows from the inner cavity of the valve housing 14 to the inner cavity of the driving cylinder 13, and then pushes the piston rod 131 of the driving cylinder 13 to move. After the piston rod 131 of the driving cylinder 13 moves, it can drive the output shaft 12 to rotate, and the output shaft 12 can output kinetic energy after rotating.

[0038] For example, Figure 2For example, after the valve core 15 moves in the direction indicated by arrow A or arrow B, the first oil outlet 141 on the valve housing 14 is connected to the first oil inlet 132 on the drive cylinder 13, and the piston rod 131 moves to the left. Or after the valve core 15 moves, the first oil outlet 141 on the valve housing 14 is connected to the second oil inlet 133 on the drive cylinder 13, and the piston cylinder moves to the right. It can be understood that in this embodiment, the rotation direction of the output shaft 12 driven by the piston rod 131 moving to the left is opposite to the rotation direction of the output shaft 12 driven by the piston rod 131 moving to the right.

[0039] It is worth noting that in this embodiment, one end of the output shaft 12 away from the piston rod 131 of the driving cylinder 13 passes through the motor body 11 and is connected to the valve core 15 through the transmission member 16. In this way, after the output shaft 12 rotates, the valve core 15 can be driven to move through the transmission action of the transmission member 16. At this time, the valve core 15 can close the first oil outlet 141, the inner cavity of the valve housing 14 is disconnected from the inner cavity of the driving cylinder 13, the hydraulic oil stops entering the inner cavity of the driving cylinder 13, the piston rod 131 stops moving, and the output shaft 12 stops rotating.

[0040] In this way, mechanical feedback between the output shaft 12 and the valve core 15 is achieved through the transmission member 16, so that after the output shaft 12 rotates for a certain period of time and a certain angle, the valve core 15 can be moved in time to disconnect the inner cavity of the valve housing 14 and the inner cavity of the drive cylinder 13 in time, so that the output shaft 12 itself stops rotating in time, thereby effectively improving the accuracy of the rotation angle and rotation speed of the output shaft 12.

[0041] Please refer to Figure 1 and Figure 2 In this embodiment, the digital hydraulic system further includes a drive motor 19 and a connecting member 20, and the drive motor 19 is transmission-connected to the valve core 15 through the connecting member 20. After the drive motor 19 is started, it can drive the connecting member 20 to rotate, thereby driving the valve core 15 to move relative to the valve housing 14.

[0042] It should be noted that, in this embodiment, the drive motor 19 is a servo motor. After receiving the control signal, the drive motor 19 can respond quickly and control the output speed more accurately.

[0043] It should be noted that, in this embodiment, the control signal received by the drive motor 19 is a pulse signal. Within the time period of a pulse signal, after the drive motor 19 is started, it can control the movement of the valve core 15, so that the inner cavity of the valve housing 14 is connected with the inner cavity of the drive cylinder 13, and the piston rod 131 drives the output shaft 12 to rotate a certain angle. The output shaft 12 moves the valve core 15 through the transmission action of the transmission member 16, so that the inner cavity of the valve housing 14 is disconnected from the inner cavity of the drive cylinder 13. Then, a second pulse signal is received, and the above-mentioned action is repeated, so that the output shaft 12 can rotate at a certain speed and continuously output kinetic energy.

[0044] Please refer to Figure 1 and Figure 2 Specifically, in this embodiment, the digital hydraulic motor 1 also includes a first universal coupling 22, one end of the connecting member 20 is threadedly connected to the shaft of the driving motor 19, and the other end of the connecting member 20 is connected to the valve core 15 through the first universal coupling 22.

[0045] In this way, after the driving motor 19 is started, it can drive the connecting member 20 to rotate, and the connecting member 20 drives the first universal coupling 22 to rotate, so that the valve core 15 can move relative to the valve housing 14.

[0046] Combination Figure 2 In this embodiment, the digital hydraulic motor 1 further includes a transition block 21, which is mounted on the rotating shaft of the driving motor 19. After the driving motor 19 is started, the transition block 21 can be driven to rotate. The connecting member 20 and the transition block 21 are threadedly matched, so that the connection strength is higher than that of the structure in which the connecting member 20 is directly threadedly matched with the rotating shaft of the driving motor 19.

[0047] Please refer to Figure 1 and Figure 2 In this embodiment, the transmission member 16 includes a lead screw 161 and a sleeve 162. The sleeve 162 is sleeved on the lead screw 161. One end of the lead screw 161 is rotatably connected to the motor body 11. The other end of the lead screw 161 is transmission-connected to one end of the output shaft 12 passing through the motor body 11. The sleeve 162 is connected to the valve core 15.

[0048] It can be understood that after the output shaft 12 rotates, it can drive the screw 161 to rotate relative to the motor body 11, and the sleeve 162 is connected to the valve core 15. During the rotation of the screw 161, the sleeve 162 moves along the axial direction of the screw 161, thereby driving the valve core 15 to move relative to the valve housing 14, so that the inner cavity of the valve housing 14 is disconnected from the inner cavity of the drive cylinder 13.

[0049] Specifically, in this embodiment, the digital hydraulic motor 1 further includes a connecting rod 25 and a second universal coupling 23, one end of the connecting rod 25 is connected to the screw sleeve 162, the other end of the connecting rod 25 cooperates with the second universal coupling 23, and the second universal coupling 23 is also connected to the valve core 15. In this way, when the lead screw 161 rotates, the screw sleeve 162 will not rotate along with the rotation of the lead screw 161, and when the screw sleeve 162 moves along the axial direction of the lead screw 161, the valve core 15 can move relative to the valve housing 14, and its moving direction is Figure 2 The direction indicated by arrow A or arrow B.

[0050] Please refer to Figure 1 and Figure 2 In this embodiment, the digital hydraulic motor 1 further includes a mounting frame 17 , which is mounted on the motor body 11 , and the transmission member 16 further includes a transmission shaft 163 , which is rotatably connected to the mounting frame 17 , and both ends of the transmission shaft 163 pass through the mounting frame 17 .

[0051] It should be noted that, in this embodiment, the end of the lead screw 161 away from the motor body 11 and the end of the output shaft 12 passing through the motor body 11 are respectively located on opposite sides of the motor body 11. Therefore, the transmission shaft 163 can make the lead screw 161 and the output shaft 12 located on opposite sides of the motor body 11 transmission connected.

[0052] Specifically, the transmission shaft 163 is rotatably connected to the mounting frame 17 through the bearing 164. One end of the transmission shaft 163 passes through the mounting frame 17 and is transmission-connected to one end of the output shaft 12 passing through the motor body 11. The other end of the transmission shaft 163 passes through the mounting frame 17 and is transmission-connected to the lead screw 161. In this way, after the output shaft 12 rotates, it can drive the transmission shaft 163 to rotate, thereby driving the lead screw 161 to rotate, so that the screw sleeve 162 moves along the axial direction of the lead screw 161, and finally drives the valve core 15 to move relative to the valve housing 14.

[0053] Specifically, in this embodiment, the transmission member 16 also includes a first gear 165, a second gear 166, a third gear 167 and a fourth gear 168. The first gear 165 and the second gear 166 are respectively sleeved on both ends of the transmission shaft 163, the third gear 167 is sleeved on one end of the output shaft 12 passing through the motor body 11, and the third gear 167 is meshed with the first gear 165. The fourth gear 168 is sleeved on one end of the screw 161 away from the motor body 11, and the fourth gear 168 is meshed with the second gear 166.

[0054] That is to say, in this embodiment, one end of the output shaft 12 passing through the motor body 11 is connected to the transmission shaft 163 through the third gear 167 and the first gear 165, and the end of the screw 161 away from the motor body 11 is connected to the transmission shaft 163 through the fourth gear 168 and the second gear 166.

[0055] Please refer to Figure 1 and Figure 2 In this embodiment, the digital hydraulic motor 1 further includes a swash plate 18 . The swash plate 18 is located in the motor body 11 , and the swash plate 18 is sleeved on the output shaft 12 .

[0056] It can be understood that in this embodiment, the piston rod 131 acts on the swash plate 18, and when the piston rod 131 moves in the inner cavity of the drive cylinder 13, the output shaft 12 can be driven to rotate through the swash plate 18. The swash plate 18 can enhance the connection strength between the piston rod 131 and the output shaft 12, and make it easier for the piston rod 131 to drive the output shaft 12 to rotate.

[0057] It should be noted that, in this embodiment, the digital hydraulic motor 1 further includes a sliding shoe 24, which is mounted on the swash plate 18, and the piston rod 131 is connected to the sliding shoe 24. When the piston rod 131 moves, the swash plate 18 is driven to rotate through the sliding shoe 24, thereby rotating the output shaft 12. In other words, the sliding shoe 24 can convert the translation of the piston rod 131 into the rotation of the output shaft 12.

[0058] Combination Figure 1 and Figure 3 In this embodiment, there are multiple driving cylinders 13, and the piston rods 131 of the multiple driving cylinders 13 act on the swash plate 18 at the same time. The multiple piston rods 131 are distributed at intervals along the circumference of the swash plate 18. In this way, when the multiple piston rods 131 move at the same time, the swash plate 18 can be driven to rotate synchronously, thereby driving the output shaft 12 to rotate, and the torque of the output shaft 12 can be increased.

[0059] Correspondingly, please refer to Figure 1 and Figure 3 In this embodiment, the number of the valve cores 15 is also multiple, and the number of the valve cores 15 is the same as the number of the driving cylinders 13, and the valve cores 15 correspond to each other. The multiple valve cores 15 are arranged on the screw sleeve 162 at intervals along the circumference of the screw sleeve 162.

[0060] In this way, when the sleeve 162 moves axially along the screw 161, it can drive multiple valve cores 15 to move, so that the hydraulic oil flows into the inner cavity of multiple driving cylinders 13, so that multiple piston rods 131 move simultaneously to act on the swash plate 18 simultaneously, thereby driving the output shaft 12 to rotate simultaneously.

[0061] This embodiment further provides a driving device, which includes the above-mentioned digital hydraulic motor 1. It is understandable that in actual use, the driving device may also include a controller, which may be used to send a control signal to the driving motor 19 to control the start and stop of the driving motor 19.

[0062] In summary, the working principle of the digital hydraulic motor 1 provided in this embodiment is as follows:

[0063] After receiving the pulse signal, the driving motor 19 starts, drives the transition block 21 to rotate, and then drives the connecting member 20 to move in the direction indicated by the arrow A or the arrow B, thereby driving the valve core 15 to move in the direction indicated by the arrow A or the arrow B. After the valve core 15 moves, the first oil outlet 141 is connected with the first oil inlet 132 (in another embodiment, the first oil outlet 141 can also be connected with the second oil inlet 133), the piston rod 131 moves to the left, and the piston rod 131 drives the output shaft 12 to rotate through the swash plate 18.

[0064] When the output shaft 12 rotates, the transmission shaft 163 is driven to rotate through the first gear 165 and the third gear 167, and the transmission shaft 163 drives the lead screw 161 to rotate through the second gear 166 and the fourth gear 168. When the lead screw 161 rotates, the screw sleeve 162 moves along the axial direction of the lead screw 161, so that the valve core 15 moves relative to the valve housing 14, so that the inner cavity of the drive cylinder 13 is disconnected from the inner cavity of the valve housing 14, the piston rod 131 stops moving, and the output shaft 12 stops rotating.

[0065] When the driving motor 19 receives the next pulse signal, it repeats the above-mentioned action again, so that the output shaft 12 can continue to rotate.

[0066] The above are only specific embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A digital hydraulic motor, characterized in that: It includes a motor body, an output shaft, a drive cylinder, a valve housing, a valve core, a transmission member, a connecting rod and a second universal coupling, wherein the output shaft is rotatably arranged on the motor body, and the piston rod of the drive cylinder is drivingly connected to one end of the output shaft; The valve core is movably arranged in the valve housing so that the inner cavity of the valve housing is connected to or disconnected from the inner cavity of the driving cylinder; The piston rod of the driving cylinder is used to drive the output shaft to rotate under the action of the hydraulic oil flowing from the inner cavity of the valve housing to the inner cavity of the driving cylinder when the inner cavity of the valve housing is connected to the inner cavity of the driving cylinder, and is used to stop driving the output shaft to rotate when the inner cavity of the valve housing is disconnected from the inner cavity of the driving cylinder; One end of the output shaft away from the piston rod of the driving cylinder passes through the motor body and is drivingly connected to the valve core through the transmission member. When the output shaft is driven by the piston rod, the valve core is driven to move through the transmission member so that the inner cavity of the valve housing is disconnected from the inner cavity of the driving cylinder. The transmission member includes a lead screw and a screw sleeve sleeved on the lead screw, one end of the lead screw is rotatably connected to the motor body, the other end of the lead screw is transmission-connected to one end of the output shaft passing through the motor body, the screw sleeve is connected to the valve core, and the screw sleeve is used to move along the axial direction of the lead screw when the lead screw is rotated by the output shaft, and drive the valve core to move, so that the inner cavity of the valve housing is disconnected from the inner cavity of the drive cylinder; One end of the connecting rod is connected to the threaded sleeve, and the other end of the connecting rod is matched with the second universal coupling, and the second universal coupling is also connected to the valve core.

2. The digital hydraulic motor according to claim 1, characterized in that: An end of the lead screw away from the motor body and an end of the output shaft passing through the motor body are respectively located on two opposite sides of the motor body; The digital hydraulic motor further comprises a mounting frame arranged on the motor body, and the transmission member further comprises a transmission shaft, and the transmission shaft is rotatably connected to the mounting frame; One end of the transmission shaft passes through the installation frame and is in driving connection with one end of the output shaft passing through the motor body, and the other end of the transmission shaft passes through the installation frame and is in driving connection with the lead screw; The output shaft is used to drive the lead screw to rotate under the drive of the transmission shaft.

3. The digital hydraulic motor according to claim 2, characterized in that: The transmission member also includes a first gear, a second gear, a third gear and a fourth gear. The first gear and the second gear are respectively sleeved on both ends of the transmission shaft. The third gear is sleeved on the end of the output shaft passing through the motor body, and the third gear is meshed with the first gear. The fourth gear is sleeved on the end of the lead screw away from the motor body, and the fourth gear is meshed with the second gear.

4. The digital hydraulic motor according to claim 1, characterized in that: The number of the valve cores and the number of the driving cylinders are both multiple and correspond one to one. The multiple valve cores are arranged on the screw sleeve at intervals along the circumference of the screw sleeve. The screw sleeve is used to drive the multiple valve cores to move at the same time, so that the piston rods of the multiple driving cylinders drive the output shaft to rotate at the same time.

5. The digital hydraulic motor according to any one of claims 1 to 3, characterized in that: The digital hydraulic motor further comprises a swash plate, which is located in the motor body and sleeved on the output shaft. The piston rod acts on the swash plate to drive the output shaft to rotate.

6. The digital hydraulic motor according to claim 5, characterized in that: There are multiple drive cylinders, and piston rods of the multiple drive cylinders act on the swash plate simultaneously to drive the output shaft to rotate. The piston rods of the multiple drive cylinders are distributed at intervals along the circumference of the swash plate.

7. The digital hydraulic motor according to any one of claims 1 to 3, characterized in that: The digital hydraulic motor further comprises a driving motor and a connecting member, wherein the driving motor is drivingly connected to the valve core via the connecting member to drive the valve core to move, thereby communicating the inner cavity of the valve housing with the inner cavity of the driving cylinder.

8. The digital hydraulic motor according to claim 7, characterized in that: The digital hydraulic motor also includes a first universal coupling, one end of the connecting member is threadedly connected to the rotating shaft of the driving motor, and the other end of the connecting member is connected to the valve core through the first universal coupling. The connecting member is used to drive the valve core to move under the action of the driving motor so that the inner cavity of the valve housing is connected to the inner cavity of the driving cylinder.

9. A driving device, characterized in that: Comprising the digital hydraulic motor as described in any one of claims 1-8.

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