hydraulic device

Abstract

This invention relates to a hydraulic device, specifically to the field of hydraulic equipment technology, and aims to solve the problem of improving the force balance of a rotating shaft. The hydraulic device includes a housing, a rotating shaft, multiple eccentric wheels, multiple suction and discharge units, multiple first control valves, and multiple second control valves. The housing has a cavity; the rotating shaft is located within the cavity and is rotatably connected to the housing around its own axis; the multiple eccentric wheels are all fixed on the rotating shaft and arranged along its axial direction, with the axes of the eccentric wheels parallel to the axis of the rotating shaft, and the multiple eccentric wheels are arranged at an angle along the circumference of the rotating shaft; the multiple suction and discharge units are installed in the housing corresponding to the multiple eccentric wheels; each suction and discharge unit includes at least two sets of suction and discharge groups, each group including at least two suction and discharge components, each component connected to a first check valve; the first control valves are connected to the first check valves of one set of suction and discharge groups and are connected to the cavity; the second control valves are connected to the first check valves of the same set of suction and discharge groups.

Description

Technical Field

[0001] This invention relates to the field of hydraulic equipment technology, and more specifically to a hydraulic device. Background Technology

[0002] The oil suction and discharge components on different eccentric wheels of the hydraulic device are connected to form an oil suction and discharge unit. When multiple oil suction and discharge components discharge oil at the same time, the shaft of the hydraulic device is subjected to a large radial unbalanced force, which has a great impact on the life of the shaft. Summary of the Invention

[0003] The purpose of this invention is to provide a hydraulic device that addresses the problem of improving the force balance of a rotating shaft.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: This application provides a hydraulic device, which includes a housing, a rotating shaft, multiple eccentric wheels, multiple suction and discharge units, multiple first control valves, and multiple second control valves. The housing has a cavity that is connected to an external oil source. The rotating shaft is located inside the cavity and is rotatably connected to the housing around its own axis. The multiple eccentric wheels are all fixed on the rotating shaft and arranged along the axial direction of the rotating shaft. The axes of the eccentric wheels are parallel to the axis of the rotating shaft, and the multiple eccentric wheels are arranged at an angle along the circumference of the rotating shaft. The multiple suction and discharge units are installed in the housing in a one-to-one correspondence with the multiple eccentric wheels. Each suction and discharge unit includes at least two sets of suction and discharge groups, and each suction and discharge group includes at least two suction and discharge components. Each suction and discharge component is connected to a first check valve. The first control valve is connected to the first check valve of one set of suction and discharge groups and is connected to the cavity or an external oil source. The second control valve is connected to the first check valve of one set of suction and discharge groups and is also connected to an external actuator. When the rotating shaft rotates around its own axis, each eccentric wheel drives the suction and discharge component in the corresponding suction and discharge unit to work.

[0005] Based on the hydraulic device provided in this application embodiment, a rotating shaft drives multiple eccentric wheels to rotate within a cavity. The eccentric wheels drive the corresponding suction / discharge oil components within the suction / discharge unit to operate. A first check valve of each suction / discharge oil component simultaneously connects to a first control valve and a second control valve. When the first control valve is open, the hydraulic medium flows back into the cavity through the first control valve; when the first control valve is closed, the hydraulic medium enters the external actuator through the second control valve. Since the first control valve and the suction / discharge oil groups are configured in a one-to-one correspondence, the opening or closing of multiple first control valves can control whether different numbers of suction / discharge oil groups discharge oil. This allows for stepped adjustment of the discharge capacity of multiple suction / discharge oil groups. The minimum adjustable discharge capacity is the discharge capacity of one suction / discharge oil group, and the maximum adjustable discharge capacity is the discharge capacity of all suction / discharge oil groups. One suction / discharge oil group can supply oil to one actuator individually, and multiple suction / discharge oil groups can supply oil to one actuator individually and achieve stepped adjustment of the discharge capacity, or supply oil to multiple actuators separately. Therefore, this hydraulic device can supply oil to multiple actuators.

[0006] Furthermore, in the embodiments of this application, when the shaft rotates, each eccentric wheel will be subjected to the reaction force of the suction and discharge oil component 1. Since the suction and discharge oil unit of the embodiments of this application includes at least two sets of suction and discharge oil groups, and each set of suction and discharge oil groups includes at least two suction and discharge oil components 1, when the shaft rotates, the reaction force of each eccentric wheel subjected to the suction and discharge oil component 1 will at least partially cancel each other out, and the shaft has better force balance.

[0007] In some embodiments of this application, the number of oil suction and discharge components in each group of oil suction and discharge units within the same oil suction and discharge unit is equal, and all oil suction and discharge components in multiple groups of oil suction and discharge units within the same oil suction and discharge unit are staggered along the circumferential direction of the rotating axis.

[0008] Based on the above embodiments, when the corresponding eccentric wheel rotates around the axis of the rotating shaft, it sequentially drives the suction and discharge components in multiple suction and discharge groups, and the pulsation rate of the hydraulic medium output by each suction and discharge group is low.

[0009] Meanwhile, the suction and discharge components in different suction and discharge groups are arranged axially in a staggered manner around the rotating shaft. This can further reduce the radial unbalanced force on the rotating shaft when a single or multiple suction and discharge groups are working, meaning that the rotating shaft has better force balance.

[0010] In some embodiments of this application, the housing also has multiple oil drain channels, each corresponding to a second control valve. Each oil drain channel is connected to a first check valve within the same suction and discharge group, and each oil drain channel is also connected to a corresponding second control valve and a corresponding first control valve.

[0011] Based on the above embodiments, the first oil drain passage connects a second control valve to at least one check valve within the same suction / discharge group, and also connects a first control valve to at least one check valve within the same suction / discharge group. Furthermore, the first oil drain passage is formed inside the housing, simplifying the external structure of the hydraulic device.

[0012] In some embodiments of this application, the first oil drain channel is arranged circumferentially around the rotating shaft, the center lines of the two first oil drain channels are located in the same cross section perpendicular to the axis of the rotating shaft, and along the radial direction of the rotating shaft, the two ends of one first oil drain channel are respectively spaced apart from the two ends of the other first oil drain channel.

[0013] Based on the above embodiments, along the radial direction of the rotating shaft, the two ends of one oil drain channel 1 are respectively spaced apart from the two ends of the other oil drain channel 1. That is, one end of one oil drain channel 1 and one end of the other oil drain channel 1 are arranged at intervals in the radial direction of the rotating shaft. Assuming that the shell is formed by casting, a mold is placed at one of the oil drain channels during the casting process. After demolding, two oil drain channels 1 will be formed at the mold position. However, the molten metal fluid in the casting process needs to pass through the gap between the two molds. The shorter the overlap length of the ends of the two oil drain channels 1 in the same cross section perpendicular to the axis of the rotating shaft, and the larger the gap between the corresponding ends of the two oil drain channels 1 in the radial direction of the rotating shaft, the shorter the overlap length of the two molds in the circumferential direction of the rotating shaft, and the larger the gap between the two molds in the radial direction of the rotating shaft. The molten metal fluid in the casting process is more likely to flow through the gap between the two molds. In this way, there are fewer defects in the shell casting, and the structural strength of the shell is higher.

[0014] In some embodiments of this application, the number of oil suction and discharge groups in different oil suction and discharge units is the same, and the installation positions of the corresponding oil suction and discharge components in the multiple oil suction and discharge groups in different oil suction and discharge units coincide along the axial direction of the rotating shaft.

[0015] Based on the above embodiments, it is assumed that there are two eccentric wheels, including a first eccentric wheel and a second eccentric wheel. The force applied to the first eccentric wheel by the suction and discharge component corresponding to the first eccentric wheel and the force applied to the second eccentric wheel by the suction and discharge component corresponding to the second eccentric wheel are equal in magnitude and opposite in direction. At this time, the forces applied to the rotating shaft by the two suction and discharge components cancel each other out, and the rotating shaft is completely force balanced.

[0016] In some embodiments of this application, the displacement of at least two groups of oil suction and discharge groups is not equal.

[0017] Based on the above embodiments, when the displacement of multiple suction and discharge oil groups is not equal, the displacement of the suction and discharge oil group with a smaller displacement is naturally smaller, and the displacement of the suction and discharge oil group with a larger displacement is naturally larger. Suction and discharge oil groups with different displacements can form more displacement combinations, and suction and discharge oil groups with smaller displacements are easier for the hydraulic device to adjust the displacement accuracy.

[0018] In some embodiments of this application, along the axial direction of the rotating shaft, the difference 'a' between the total displacement of all oil suction and discharge components in the two most end oil suction and discharge units at the two ends of the plurality of oil suction and discharge units is the smallest, and a≥0.

[0019] Based on the above embodiments, the difference 'a' between the total displacement of all oil suction and discharge components in the two oil suction and discharge units at the two ends is the smallest. Therefore, the difference in the force exerted on the rotating shaft by the two oil suction and discharge units at the two ends is the smallest, which means that the rotating shaft is more balanced by force, which is beneficial to the force balance of the rotating shaft.

[0020] In some embodiments of this application, at least two of the eccentric wheels have unequal eccentric distances.

[0021] Based on the above embodiments, when the eccentricity of each eccentric wheel is not equal, the travel of the suction and discharge components in each suction and discharge unit is not equal. The suction and discharge group composed of suction and discharge components with shorter travel naturally has a smaller discharge capacity, while the suction and discharge group composed of suction and discharge components with longer travel naturally has a larger discharge capacity. The suction and discharge group with smaller discharge capacity is more convenient for the hydraulic device to adjust the discharge accuracy.

[0022] In some embodiments of this application, multiple oil suction and discharge components in the oil suction and discharge unit are equally spaced along the circumference of the rotating shaft. Multiple eccentric wheels include a first eccentric wheel and a second eccentric wheel. The angle between the eccentric direction of the first eccentric wheel and the eccentric direction of the second eccentric wheel is α, and (180°-360° / number of all oil suction and discharge components in the two oil suction and discharge units) ≤ α ≤ 180°.

[0023] Based on the above embodiments, the angle between the eccentric direction of the first eccentric wheel and the eccentric direction of the second eccentric wheel is set to simultaneously consider the displacement pulsation and the radial imbalance force of the shaft 12; when α is the lower limit, the displacement pulsation rate is the smallest and the radial imbalance force of the shaft 12 is the largest; when α is the upper limit, the displacement pulsation rate is the largest and the radial imbalance force of the shaft 12 is the smallest; when α changes from the lower limit to the upper limit, the displacement pulsation rate gradually changes from the smallest to the largest, and the radial imbalance force of the shaft 12 gradually changes from the largest to the smallest.

[0024] In some embodiments of this application, the plurality of eccentric wheels also includes a third eccentric wheel, the angle between the eccentric direction of the third eccentric wheel and the eccentric direction of the first eccentric wheel is β, β = (-90° - 1 / 2α).

[0025] Based on the above embodiments, when the first and second eccentric wheels fail to balance the shaft, a third eccentric wheel is provided on the shaft. The bisector of the angle between the eccentric direction of the first eccentric wheel and the eccentric direction of the second eccentric wheel coincides with the eccentric direction of the third eccentric wheel. That is, the third eccentric wheel balances the first and second eccentric wheels, so that the resultant force on the shaft is 0 or reduced.

[0026] In some embodiments of this application, the number of oil suction and discharge units is three. Along the axial direction of the rotating shaft, the housing includes a front section and a rear section connected to each other. The front section is provided with two oil suction and discharge units, and the rear section is provided with one oil suction and discharge unit.

[0027] Based on the above embodiments, when there are a large number of oil suction and discharge units, the housing is divided into a front section and a rear section along the axis of the rotating shaft. Multiple oil suction and discharge units are distributed on the front section and the rear section. Multiple oil discharge channels connected to the multiple oil suction and discharge units are distributed on the front section and the rear section. Since the oil discharge channels are set inside the housing, dividing the housing into a front section and a rear section facilitates the manufacturing of the oil discharge channels.

[0028] In some embodiments of this application, the housing has a through hole extending radially, the through hole connecting the cavity and the outside of the housing; the housing includes a support base and a plug, the support base being disposed within the through hole of the housing; the plug is fixedly disposed within the through hole and located on the side of the support base away from the rotating shaft; the suction and discharge unit includes a plunger and a slipper, the slipper including a connecting part and a mating part connected to each other, the connecting part and the plunger being slidably connected along the radial direction of the eccentric wheel and surrounding an accommodating cavity; the mating part has a contact surface that mates with the eccentric wheel, the contact surface corresponding to the eccentric wheel being configured as an arc-shaped surface; the suction and discharge unit also includes a return ring, the return ring connecting all mating parts within the same suction and discharge unit, and the return ring and the mating parts being connected on the side away from the rotating shaft; wherein, when the eccentric wheel rotates around the axis of the rotating shaft, at least one slipper can move radially relative to the plunger relative to the eccentric wheel, and the return ring can drive the remaining slippers within the suction and discharge unit to move relative to the corresponding plunger.

[0029] Based on the above embodiments, the plug seals the support seat in the through hole, the plunger is hinged to the support seat, and when the eccentric wheel rotates, the plunger can rotate around the hinge point between itself and the support seat. When the eccentric wheel rotates around the axis of the rotating shaft, the eccentric wheel contacts the arc surface of the mating part and slides relative to the arc surface. Since the eccentric wheel pushes at least one slipper to move away from the rotating shaft along the radial direction of the eccentric wheel when it rotates, during this process, the plunger and the connecting part move relative to each other to discharge the hydraulic medium in the accommodating cavity. The eccentric wheel drives the other suction and discharge parts to suck up the hydraulic medium through the return ring. When the eccentric wheel rotates a certain angle, the slipper can return to its original position.

[0030] In some embodiments of this application, the housing has a through hole extending radially, which connects the cavity and the outside of the housing; the suction and discharge unit includes a plunger and a slipper, the plunger is fixedly inserted into the through hole, and a ball head is provided at the end of the plunger facing the rotating shaft; the slipper includes a connecting part and a mating part connected to each other, the connecting part has a receiving groove at the end away from the rotating shaft, and the ball head is provided in the receiving groove to surround a receiving cavity for suction of hydraulic medium; the mating part has a contact surface that mates with an eccentric wheel, and the contact surface is provided with an arc-shaped surface corresponding to the eccentric wheel; the suction and discharge unit also includes a return ring, which connects all mating parts in the same suction and discharge unit, and the return ring and the mating parts are connected on the side away from the rotating shaft; wherein, when the eccentric wheel rotates around the axis of the rotating shaft, it can cause the slipper to move radially relative to the plunger along the rotating shaft, and the return ring can drive the other slippers in the suction and discharge unit to move relative to the corresponding plunger.

[0031] Based on the above embodiments, the plunger is fixedly inserted into the through hole. After the plunger is set in the receiving groove through the ball head, the plunger and the slipper can rotate relative to each other and slide relative to each other along the radial direction of the eccentric wheel. The eccentric wheel contacts the arc-shaped surface of the mating part and slides relative to the arc-shaped surface. Since the eccentric wheel rotates, it pushes at least one slipper to move away from the axis of rotation along the radial direction of the eccentric wheel. During this process, the plunger and the connecting part move relative to each other to discharge the hydraulic medium in the receiving cavity. The eccentric wheel drives the other suction and discharge parts to suck up the hydraulic medium through the return ring. When the eccentric wheel rotates a certain angle, the slipper can return to its original position.

[0032] In some embodiments of this application, the oil suction and discharge unit further includes a limiting member, the limiting member and the slipper are surrounded by a limiting groove, the limiting member and the slipper are fixedly connected, and the return ring portion is located in the limiting groove.

[0033] Based on the above embodiments, the groove wall of the limiting groove can restrict the movement of the return ring in the axial direction of the rotating shaft. After the limiting member and the slipper are connected, the return ring is clamped to achieve the limiting of the return ring.

[0034] In some embodiments of this application, each suction and discharge unit includes two return rings, which are respectively disposed on both sides of the connecting part along the axial direction of the rotating shaft; at least one connector is connected between the two return rings in the same suction and discharge unit, and when there are multiple connectors, the multiple connectors are arranged at intervals along the circumference of the return rings.

[0035] Based on the above embodiments, the two return rings in a suction and discharge unit are located on both sides of the connecting part. After the two return rings are connected together by the connector, the connecting part restricts the movement of the two return rings along the axial direction of the rotating shaft, thereby limiting the position of the return rings.

[0036] In some embodiments of this application, the two return rings and at least one connector of the same oil suction and discharge unit are integrally configured.

[0037] Based on the above embodiments, the integration of the return ring and the connecting parts is improved after they are integrated.

[0038] In some embodiments of this application, at least one suction and discharge oil assembly further includes at least one suction and discharge oil component two, which is disposed in the housing. The suction and discharge oil component two is connected to a second one-way valve, which is connected to a third control valve and a fourth control valve. The third control valve is connected to a cavity or an oil source, and the fourth control valve is connected to an external actuator. Each of the remaining suction and discharge oil assemblies also includes at least one suction and discharge oil component three, which is disposed in the housing. The number of suction and discharge oil components two in at least one suction and discharge oil assembly is equal to the number of suction and discharge oil components three in the remaining suction and discharge oil assemblies, and the suction and discharge oil components three are connected to a first one-way valve. When the rotating shaft rotates around its own axis, each eccentric wheel drives the suction and discharge oil components two and three in the corresponding suction and discharge oil unit to work.

[0039] Based on the above embodiments, the rotating shaft drives multiple eccentric wheels to rotate within the cavity. The eccentric wheels drive the corresponding suction and discharge oil components one and three within the corresponding suction and discharge unit to work, or drive the corresponding suction and discharge oil components one and two within the corresponding suction and discharge unit to work. The second check valve of suction and discharge component two is simultaneously connected to a third control valve and a fourth control valve. The third control valve is connected to the cavity or the oil source, and the fourth control valve is connected to an external actuator. When the third control valve is open, the hydraulic medium flows back to the cavity or the oil source through the third control valve. When the third control valve is closed, the hydraulic medium enters the external actuator through the fourth control valve. Since the third control valve and the suction / discharge oil components are configured in a one-to-one correspondence, the opening or closing of the third control valve can control whether the suction / discharge oil components discharge oil. This makes the minimum adjustable discharge capacity of the suction / discharge oil group the discharge capacity of one suction / discharge oil component, and the maximum adjustable discharge capacity the sum of the discharge capacities of all suction / discharge oil components in the suction / discharge oil group. This makes the minimum adjustable discharge capacity of the hydraulic device the discharge capacity of one suction / discharge oil component, and the maximum adjustable discharge capacity the sum of the discharge capacities of all suction / discharge oil groups. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the hydraulic device in some embodiments of this application.

[0041] Figure 2 This is a schematic diagram of the structure after the shaft and eccentric wheel are connected in some embodiments of this application.

[0042] Figure 3 for Figure 1 The hydraulic device shown is a schematic cross-sectional view along AA.

[0043] Figure 4 for Figure 1 The diagram shows the structure of the hydraulic device after the housing has been removed.

[0044] Figure 5This is a schematic diagram of the structure of an eccentric wheel driving an oil suction and discharge unit in some embodiments of this application.

[0045] Figure 6 This is a schematic diagram of the hydraulic device in some other embodiments of this application.

[0046] Figure 7 for Figure 1 The hydraulic device shown is a schematic cross-section along BB.

[0047] Figure 8 This is a schematic diagram of the structure of an eccentric wheel-driven oil suction and discharge component in some embodiments of this application.

[0048] Figure 9 This is a schematic diagram of the structure of an eccentric wheel-driven oil suction and discharge component in some other embodiments of this application.

[0049] Figure 10 This is a schematic diagram showing the connection of the limiting member, return ring, and slipper in some embodiments of this application.

[0050] Figure 11 This is a partial structural diagram of the slipper and return loop in some embodiments of this application.

[0051] Figure 12 This is a schematic diagram of the structure after the return loop and the connector are connected in some embodiments of this application.

[0052] Figure 13 This is a schematic diagram of the structure after the return loop and the connector are connected in other embodiments of this application.

[0053] Figure 14 for Figure 1 The hydraulic device shown is illustrated in another cross-sectional view along AA.

[0054] Figure 15 This is a schematic diagram illustrating the operation of an eccentric wheel driving an oil suction and discharge unit in some other embodiments of this application.

[0055] Figure 16 This is a schematic diagram of the structure of an eccentric wheel driving an oil suction and discharge unit in some embodiments of this application.

[0056] Figure label: 11. Housing; 111. Through hole; 112. Front section; 113. Rear section; 12. Rotating shaft; 13. Eccentric wheel; 131. Oil suction groove; 14. Oil suction / discharge component one; 141. Plunger component; 142. Slipper; 143. Receiving cavity; 144. Support seat; 145. Plug; 15. First check valve; 16A. Oil discharge passage one; 16B. Oil discharge passage two; 17. First control valve; 18. Second control valve; 19. Return ring; 20. Limiting component; 201. Limiting groove; 30. Connecting component; 40. Oil suction / discharge component two; 50. Second check valve; 60. Third control valve; 70. Fourth control valve; 80. Oil suction / discharge component three. Detailed Implementation

[0057] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0058] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0059] Please refer to Figures 1 to 5 As shown, in a first aspect, embodiments of this application provide a hydraulic device, which includes a housing 11, a rotating shaft 12, multiple eccentric wheels 13, multiple suction and discharge oil units, multiple first control valves 17, and multiple second control valves 18. The housing 11 has a cavity that communicates with an external oil source; the rotating shaft 12 is located within the cavity and is rotatably connected to the housing 11 around its own axis; the multiple eccentric wheels 13 are all fixed on the rotating shaft 12 and arranged along the axial direction of the rotating shaft 12, with the axes of the eccentric wheels 13 parallel to the axis of the rotating shaft 12, and the multiple eccentric wheels 13 are arranged at an angle along the circumference of the rotating shaft 12; the multiple suction and discharge oil units... Multiple eccentric wheels 13 are installed on the housing 11 in a one-to-one correspondence; the oil suction and discharge unit includes at least two sets of oil suction and discharge groups, each set including at least two oil suction and discharge components 14, each component 14 being connected to a first check valve 15; a first control valve 17 is connected to the first check valve 15 of one set of oil suction and discharge groups, and the first control valve 17 is connected to a cavity or an external oil source; a second control valve 18 is connected to the first check valve 15 of one set of oil suction and discharge groups, and the second control valve 18 is connected to an external actuator; wherein, when the rotating shaft 12 rotates around its own axis, each eccentric wheel 13 drives the corresponding oil suction and discharge component 14 in the oil suction and discharge unit to work.

[0060] In this embodiment, a bearing is provided between the rotating shaft 12 and the housing 11. The rotating shaft 12 is fixedly connected to the inner ring of the bearing, and the housing 11 is fixedly connected to the outer ring of the bearing, so that the rotating shaft 12 can rotate relative to the housing 11. There are two bearings, which are located at opposite ends of the rotating shaft 12.

[0061] It is understood that the hydraulic device in the embodiments of this application has multiple second control valves 18, that is, the hydraulic device of this application can be connected to multiple external actuators, that is, the hydraulic device can drive multiple external actuators simultaneously.

[0062] Shaft 12 is used to drive the eccentric wheel 13 to rotate. Please refer to [reference needed]. Figure 1 and Figure 2 As shown, two eccentric wheels 13 are arranged along the axial direction of the rotating shaft 12. The two eccentric wheels 13 are arranged opposite each other along the circumference of the rotating shaft 12. An oil suction groove 131 is provided on the eccentric wheel 13. When the rotating shaft 12 drives the oil suction and discharge component 14, there is hydraulic medium in the oil suction groove 131. The oil suction and discharge component 14 sucks up the hydraulic medium in the oil suction groove 131.

[0063] Based on the hydraulic device provided in this application embodiment, the rotating shaft 12 drives multiple eccentric wheels 13 to rotate within the cavity. The eccentric wheels 13 drive the corresponding suction / discharge oil components 14 within the suction / discharge unit to operate. A set of first check valves 15 of the suction / discharge oil components 14 simultaneously connects a first control valve 17 and a second control valve 18. When the first control valve 17 is open, the hydraulic medium flows back into the cavity through the first control valve 17; when the first control valve 17 is closed, the hydraulic medium enters the external actuator through the second control valve 18. Since the first control valve 17 and the suction / discharge oil groups are configured in a one-to-one correspondence, different numbers of suction / discharge oil groups can be controlled to discharge oil by opening or closing multiple first control valves 17. This allows for step-wise adjustment of the discharge capacity of multiple suction / discharge oil groups. The minimum adjustable discharge capacity is the discharge capacity of one suction / discharge oil group, and the maximum adjustable discharge capacity is the discharge capacity of all suction / discharge oil groups. One or more suction / discharge oil groups can individually supply oil to one actuator; therefore, this hydraulic device can supply oil to multiple actuators.

[0064] Furthermore, in this embodiment, when the rotating shaft 12 rotates, each eccentric wheel 13 will be subjected to the reaction force of the oil suction and discharge component 14. Since the oil suction and discharge unit in this embodiment includes at least two sets of oil suction and discharge groups, and each set of oil suction and discharge groups includes at least two oil suction and discharge components 14, the reaction force of each eccentric wheel 13 subjected to the oil suction and discharge component 14 when the rotating shaft 12 rotates will at least partially cancel each other out, and the rotating shaft 12 has better force balance.

[0065] Please refer to Figure 4 as well as Figure 5As shown, in some embodiments of this application, the number of oil suction and discharge components 14 in each group of oil suction and discharge units in the same oil suction and discharge unit is equal, and all oil suction and discharge components 14 in multiple groups of oil suction and discharge units in the same oil suction and discharge unit are staggered along the circumference of the rotating shaft 12.

[0066] When the corresponding eccentric wheel 13 rotates around the axis of the rotating shaft 12, the eccentric wheel 13 alternately drives the suction and discharge oil components 14 in the two sets of suction and discharge oil groups, which can continuously supply hydraulic medium to multiple external actuators so that the hydraulic device can drive multiple actuators at the same time.

[0067] Meanwhile, the suction and discharge components 14 in different suction and discharge groups are arranged in an alternating manner around the rotating shaft 12. In this way, when a single or multiple suction and discharge groups are working, the radial unbalanced force borne by the rotating shaft 12 can be further reduced significantly, that is, the rotating shaft 12 has better force balance.

[0068] Please refer to Figures 3 to 5 As shown, in some embodiments of this application, the housing 11 also has a plurality of oil drain channels 16A, which are provided corresponding to the second control valve 18. The oil drain channels 16A are connected to the first check valve 15 in the same oil suction and discharge group, and the oil drain channels 16A are also connected to the corresponding second control valve 18 and the corresponding first control valve 17.

[0069] Oil drain passage 16A is formed inside housing 11, which simplifies the external structure of the hydraulic device.

[0070] The oil drain channel 16A is used to connect all the first check valves 15 corresponding to all the suction and discharge components 14 in the same group of suction and discharge groups. That is, the second control valve 18 connects to all the first check valves 15 corresponding to all the suction and discharge components 14 in a group of suction and discharge groups through the oil drain channel 16A. In this embodiment, the shape, length, diameter and other aspects of the oil drain channel 16A are not limited, as long as the oil drain channel 16A can connect to all the first check valves 15 corresponding to multiple suction and discharge components 14 in the same group.

[0071] For example, the oil suction and discharge unit includes a first oil suction and discharge group and a second oil suction and discharge group. The first oil suction and discharge group includes multiple first oil suction and discharge components, and the second oil suction and discharge group includes multiple second oil suction and discharge components. There is a second oil suction and discharge component between adjacent first oil suction and discharge components. Multiple oil discharge channels 16A include first oil discharge channels and second oil discharge channels. The first oil discharge channels are connected to multiple first check valves 15 corresponding to multiple first oil suction and discharge components, and the second oil discharge channels are connected to multiple first check valves 15 corresponding to multiple second oil suction and discharge components. After the corresponding eccentric wheel 13 drives the first oil suction and discharge component to supply hydraulic medium to the first oil discharge channel, it then drives the second oil suction and discharge component to supply hydraulic medium to the second oil discharge channel. Subsequently, it drives another first oil suction and discharge component to supply hydraulic medium to the first oil discharge channel. This cycle is repeated so that hydraulic medium can be supplied to each oil discharge channel 16A in equal amounts.

[0072] For example, the oil suction and discharge unit includes a first oil suction and discharge group, a second oil suction and discharge group, and a third oil suction and discharge group. The first oil suction and discharge group includes multiple first oil suction and discharge components, the second oil suction and discharge group includes multiple second oil suction and discharge components, and the third oil suction and discharge group includes multiple third oil suction and discharge components. Then, there is a second oil suction and discharge component and a third oil suction and discharge component between adjacent first oil suction and discharge components. Similarly, there is a first oil suction and discharge component and a third oil suction and discharge component between adjacent second oil suction and discharge components.

[0073] It is understandable that the multiple suction and discharge components 14 within the multiple suction and discharge groups can be arranged arbitrarily. For example, the suction and discharge unit includes a first suction and discharge group and a second suction and discharge group. The first suction and discharge group includes multiple first suction and discharge components, and the second suction and discharge group includes multiple second suction and discharge components. The multiple first suction and discharge components and the multiple second suction and discharge components are arranged arbitrarily along the circumference of the rotating shaft 12.

[0074] It is understandable that when there is only one suction / discharge component 14 in a set of suction / discharge oil groups, the first check valve 15 corresponding to the suction / discharge component 14 can be directly connected to the second control valve 18 without the need for the oil discharge channel 16A.

[0075] In some embodiments of this application, when the oil drain channel 16A is connected to the first check valve 15 corresponding to multiple oil suction and discharge components 14 in a single oil suction and discharge group within the same oil suction and discharge unit, since the multiple oil suction and discharge components 14 in the same oil suction and discharge unit are arranged circumferentially along the rotating shaft 12, the multiple oil suction and discharge components 14 in a single oil suction and discharge group within the same oil suction and discharge unit work sequentially, resulting in a low pulsation rate of the hydraulic medium entering the oil drain channel 16A.

[0076] Please refer to Figure 3 and Figure 7 As shown, or Figure 6 and Figure 7 As shown, in some embodiments of this application, the oil drain channels 16A are arranged circumferentially around the rotating shaft 12, and the center lines of the two oil drain channels 16A are located in the same cross-section perpendicular to the axis of the rotating shaft 12. Along the radial direction of the rotating shaft 12, the two ends of one oil drain channel 16A are respectively spaced apart from the two ends of the other oil drain channel 16A. That is, one end of one oil drain channel 16A and one end of the other oil drain channel 16A are arranged at intervals in the radial direction of the rotating shaft 12.

[0077] In this embodiment, the shell 1111 is formed by casting. During the casting of the shell 11, a mold is placed at the oil drain channel 16A. After demolding, two oil drain channels 16A will be formed at the mold position. However, the molten metal fluid in the casting process needs to pass through the gap between the two molds. The shorter the overlap length of the ends of the two oil drain channels 16A in the same cross section perpendicular to the axis of the rotating shaft 12, and the larger the gap between the corresponding ends of the two oil drain channels 16A in the radial direction of the rotating shaft 12, the shorter the overlap length of the two molds in the circumferential direction of the rotating shaft 12, and the larger the gap between the two molds in the radial direction of the rotating shaft 12. The molten metal fluid in the casting process is more likely to flow through the gap between the two molds. In this way, the casting of the shell 11 has fewer defects, and the structural strength of the shell 11 is higher.

[0078] For example, in some embodiments of this application, the hydraulic device includes a first suction and discharge unit and a second suction and discharge unit. The first suction and discharge unit includes a first suction and discharge group and a second suction and discharge group. The second suction and discharge unit includes a third suction and discharge group and a fourth suction and discharge group. The plurality of discharge channels 16A include a first discharge channel, a second discharge channel, a third discharge channel and a fourth discharge channel. The first discharge channel is connected to the first check valve 15 corresponding to all suction and discharge components 14 in the first suction and discharge group. The second discharge channel is connected to the first check valve 15 corresponding to all suction and discharge components 14 in the second suction and discharge group. The third discharge channel is connected to the first check valve 15 corresponding to all suction and discharge components 14 in the third suction and discharge group. The fourth discharge channel is connected to the first check valve 15 corresponding to all suction and discharge components 14 in the fourth suction and discharge group. Along the axial direction of the rotating shaft 12, the first oil discharge channel is located on the side of the first suction and discharge unit away from the second suction and discharge unit, the second oil discharge channel is located between the first suction and discharge unit and the second suction and discharge unit, and the third and fourth oil discharge channels are located on the side of the second suction and discharge unit away from the first suction and discharge unit.

[0079] For example, in some embodiments of this application, the hydraulic device includes a first suction and discharge unit, a second suction and discharge unit, and a third suction and discharge unit. The first suction and discharge unit includes a first suction and discharge group and a second suction and discharge group. The second suction and discharge unit includes a third suction and discharge group and a fourth suction and discharge group. The third suction and discharge unit includes a fifth suction and discharge group and a sixth suction and discharge group. Multiple discharge channels 16A include a first discharge channel, a second discharge channel, a third discharge channel, a fourth discharge channel, a fifth discharge channel, and a sixth discharge channel. The first discharge channel connects all the suction and discharge groups within the first suction and discharge group. The first check valve 15 corresponding to the oil discharge component 14; the second oil discharge passage connects to the first check valve 15 corresponding to all oil discharge components 14 in the second oil suction and discharge group; the third oil discharge passage connects to the first check valve 15 corresponding to all oil discharge components 14 in the third oil suction and discharge group; the fourth oil discharge passage connects to the first check valve 15 corresponding to all oil discharge components 14 in the fourth oil suction and discharge group; the fifth oil discharge passage connects to all oil discharge components 14 in the fifth oil suction and discharge group; and the sixth oil discharge passage connects to the first check valve 15 corresponding to all oil discharge components 14 in the sixth oil suction and discharge group. Along the axial direction of the rotating shaft 12, the first oil discharge passage is located on the side of the first oil suction and discharge unit away from the second oil suction and discharge unit; the second oil discharge passage is located between the first and second oil suction and discharge units; the third and fourth oil discharge passages are located between the second and third oil suction and discharge units; and the fifth and sixth oil discharge passages are located on the side of the third oil suction and discharge unit away from the first oil suction and discharge unit.

[0080] In some embodiments of this application, multiple eccentric wheels 13 are equally spaced along the circumference of the rotating shaft 12, the number of oil suction and discharge groups in different oil suction and discharge units is the same, and the installation positions of the corresponding oil suction and discharge components 14 in the multiple oil suction and discharge groups in different oil suction and discharge units coincide along the axial direction of the rotating shaft 12.

[0081] For example, there are two eccentric wheels 13, including a first eccentric wheel 13 and a second eccentric wheel 13. The force applied to the first eccentric wheel 13 by the suction and discharge oil component 14 corresponding to the first eccentric wheel 13 is equal in magnitude and opposite in direction to the force applied to the second eccentric wheel 13 by the suction and discharge oil component 14 corresponding to the second eccentric wheel 13. At this time, the forces applied to the rotating shaft 12 by the two suction and discharge oil components 14 cancel each other out, and the rotating shaft 12 is completely balanced by force.

[0082] In some embodiments of this application, the displacement of at least two groups of oil suction and discharge groups is not equal.

[0083] When the displacement of the suction / discharge components 14 within multiple suction / discharge groups is unequal, the suction / discharge component 14 with the smaller displacement naturally has a smaller displacement, and the suction / discharge component 14 with the larger displacement naturally has a larger displacement. The suction / discharge component 14 with the smaller displacement facilitates the hydraulic device's adjustment of the displacement accuracy. It can be understood that each suction / discharge component 14 has a receiving cavity 143, and the displacement of each suction / discharge component 14 is equal to the product of the cross-sectional area of ​​the receiving cavity 143 and its stroke. The displacement of the suction / discharge group is equal to the sum of the displacements of all suction / discharge components 14 within the group.

[0084] In this application, the displacement of at least two groups of oil suction and discharge groups is not equal, including the following three situations: In the first case, the discharge rates of the two suction and discharge groups within the same suction and discharge unit are not equal.

[0085] For example, the first oil suction and discharge unit includes a first oil suction and discharge group and a second oil suction and discharge group. The second oil suction and discharge unit includes a third oil suction and discharge group and a fourth oil suction and discharge group. The ratio of the cross-section of the receiving cavity 143 of the oil suction and discharge component 14 in the first oil suction and discharge group, the cross-section of the receiving cavity 143 of the oil suction and discharge component 14 in the second oil suction and discharge group, the cross-section of the receiving cavity 143 of the oil suction and discharge component 14 in the third oil suction and discharge group, and the cross-section of the receiving cavity 143 of the oil suction and discharge component 14 in the fourth oil suction and discharge group is 1:2:1:2. The number and stroke of the oil suction and discharge component 14 in the first oil suction and discharge group, the second oil suction and discharge group, the third oil suction and discharge group, and the fourth oil suction and discharge group are all equal. Assume the displacement of the suction / discharge component 14 in the first suction / discharge group is B, the displacement of the suction / discharge component 14 in the second suction / discharge group is 2B, the displacement of the suction / discharge component 14 in the third suction / discharge group is B, and the displacement of the suction / discharge component 14 in the fourth suction / discharge group is 2B, and the number of suction / discharge components 14 in each of the first, second, third, and fourth suction / discharge groups is M. Then, the minimum displacement of the first suction / discharge unit is MB, and the maximum displacement of the first suction / discharge unit is 3MB; the minimum displacement of the second suction / discharge unit is MB, and the maximum displacement of the second suction / discharge unit is 3MB; the minimum displacement of the hydraulic device is MB, and the maximum displacement of the hydraulic device is 6MB, thus achieving displacement adjustment.

[0086] In the second case, the discharge rates of the two suction and discharge groups within different suction and discharge units are not equal.

[0087] For example, the first oil suction and discharge unit includes a first oil suction and discharge group and a second oil suction and discharge group. The second oil suction and discharge unit includes a third oil suction and discharge group and a fourth oil suction and discharge group. The ratio of the cross-section of the receiving cavity 143 of the oil suction and discharge component 14 in the first oil suction and discharge group, the cross-section of the receiving cavity 143 of the oil suction and discharge component 14 in the second oil suction and discharge group, the cross-section of the receiving cavity 143 of the oil suction and discharge component 14 in the third oil suction and discharge group, and the cross-section of the receiving cavity 143 of the oil suction and discharge component 14 in the fourth oil suction and discharge group is 1:1:2:2. The number and stroke of the oil suction and discharge component 14 in the first oil suction and discharge group, the second oil suction and discharge group, the third oil suction and discharge group, and the fourth oil suction and discharge group are all equal. Assume the displacement of the suction / discharge component 14 in the first suction / discharge group is B, the displacement of the suction / discharge component 14 in the second suction / discharge group is B, the displacement of the suction / discharge component 14 in the third suction / discharge group is 2B, and the displacement of the suction / discharge component 14 in the fourth suction / discharge group is 2B. The number of suction / discharge components 14 in each of the first, second, third, and fourth suction / discharge groups is M. The minimum displacement of the first suction / discharge unit is MB, and the maximum displacement of the first suction / discharge unit is 2MB; the minimum displacement of the second suction / discharge unit is 2MB, and the maximum displacement of the first suction / discharge unit is 4MB; the minimum displacement of the hydraulic device is MB, and the maximum displacement of the hydraulic device is 6MB, thus achieving displacement adjustment.

[0088] In the third case, the discharge rates of the two suction and discharge groups within the same suction and discharge unit are not equal, and the discharge rates of the two suction and discharge groups within different suction and discharge units are not equal.

[0089] For example, the first suction and discharge unit includes a first suction and discharge group and a second suction and discharge group. The second suction and discharge unit includes a third suction and discharge group and a fourth suction and discharge group. The ratio of the cross-section of the receiving cavity 143 of the suction and discharge component 14 in the first suction and discharge group, the cross-section of the receiving cavity 143 of the suction and discharge component 14 in the second suction and discharge group, the cross-section of the receiving cavity 143 of the suction and discharge component 14 in the third suction and discharge group, and the cross-section of the receiving cavity 143 of the suction and discharge component 14 in the fourth suction and discharge group is 1:2:4:4. The number and stroke of the suction and discharge components 14 in the first suction and discharge group, the second suction and discharge group, the third suction and discharge group, and the fourth suction and discharge group are all equal. Assume the displacement of the suction / discharge component 14 in the first suction / discharge group is B, the displacement of the suction / discharge component 14 in the second suction / discharge group is 2B, the displacement of the suction / discharge component 14 in the third suction / discharge group is 4B, and the displacement of the suction / discharge component 14 in the fourth suction / discharge group is 4B, and the number of suction / discharge components 14 in each of the first, second, third, and fourth suction / discharge groups is M. Then, the minimum displacement of the first suction / discharge unit is MB, and the maximum displacement of the first suction / discharge unit is 3MB; the minimum displacement of the second suction / discharge unit is 4MB, and the maximum displacement of the first suction / discharge unit is 8MB; the minimum displacement of the hydraulic device is MB, and the maximum displacement of the hydraulic device is 11MB, thus achieving displacement adjustment.

[0090] Furthermore, by combining the different cross-sections of the accommodating cavity 143 of the oil suction and discharge component 14 in at least two of the oil suction and discharge units mentioned above, oil suction and discharge groups with larger discharge capacities can be formed.

[0091] In some embodiments of this application, along the axial direction of the rotating shaft 12, the difference 'a' between the total displacement of all oil suction / discharge components 14 in the two most distant oil suction / discharge units is the smallest, where a ≥ 0. Since the difference 'a' between the total displacement of all oil suction / discharge components 14 in the two most distant oil suction / discharge units is the smallest, the difference in the force exerted on the rotating shaft 12 by the two most distant oil suction / discharge units is also the smallest. This means the rotating shaft 12 experiences more balanced forces, which is beneficial to the force balance of the rotating shaft 12.

[0092] In some embodiments of this application, at least two of the eccentric wheels 13 have unequal eccentric distances.

[0093] When the eccentricity of each eccentric wheel 13 is not equal, the travel of the corresponding suction and discharge oil components 14 in each suction and discharge unit is not equal. The suction and discharge oil component 14 with a shorter travel naturally has a smaller discharge volume, while the suction and discharge oil component 14 with a longer travel naturally has a larger discharge volume. The suction and discharge oil component 14 with a smaller discharge volume is easier for the hydraulic device to adjust the discharge volume with precision.

[0094] It is understood that in some embodiments of this application, the eccentricity of the eccentric wheel 13 in each corresponding oil suction and discharge unit is equal. In this case, each eccentric wheel 13 can be the same size, and the rotating shaft 12 has good force balance.

[0095] In some embodiments of this application, the oil suction and discharge components 14 in the oil suction and discharge unit are evenly distributed along the circumference of the rotating shaft 12, and along the axial direction of the rotating shaft 12, the oil suction and discharge components 14 in the oil suction and discharge unit correspond to and overlap with the oil suction and discharge components 14 in another oil suction and discharge unit. The plurality of eccentric wheels 13 include a first eccentric wheel and a second eccentric wheel. The angle between the eccentric direction of the first eccentric wheel and the eccentric direction of the second eccentric wheel is α, (180°-360° / number of all oil suction and discharge components 14 in the two oil suction and discharge units)≤α≤180°.

[0096] At this time, the angle between the eccentric direction of the first eccentric wheel 13 and the eccentric direction of the second eccentric wheel 13 takes into account both the displacement pulsation and the radial imbalance force of the shaft 12. When α is the lower limit, the displacement pulsation rate is the smallest and the radial imbalance force of the shaft 12 is the largest. When α is the upper limit, the displacement pulsation rate is the largest and the radial imbalance force of the shaft 12 is the smallest. When α changes from the lower limit to the upper limit, the displacement pulsation rate gradually changes from the smallest to the largest, and the radial imbalance force of the shaft 12 gradually changes from the largest to the smallest.

[0097] For example, when there are 6 oil suction / discharge components 14 in each oil suction / discharge unit, α = 180° - 360° / 12 = 150°; when there are 8 oil suction / discharge components 14 in each oil suction / discharge unit, α = 180° - 360° / 16 = 157.5°.

[0098] In some embodiments of this application, the plurality of eccentric wheels 13 further includes a third eccentric wheel, the angle between the eccentric direction of the third eccentric wheel and the eccentric direction of the first eccentric wheel being β, where β = (-90° - 1 / 2α). When the first eccentric wheel 13 and the second eccentric wheel 13 fail to balance the rotating shaft 12, by setting the third eccentric wheel 13 on the rotating shaft 12, the bisector of the angle between the eccentric directions of the first eccentric wheel 13 and the eccentric directions of the second eccentric wheel 13 coincides with the eccentric direction of the third eccentric wheel 13. That is, the third eccentric wheel 13 balances the first eccentric wheel 13 and the second eccentric wheel 13, so that the resultant force on the rotating shaft 12 is 0 or reduced.

[0099] In some embodiments of this application, each group of oil suction and discharge units includes 6 oil suction and discharge components 14, 150°≤α≤180°, for example, 155°, 160°, 165°, 170° or 175°, etc.

[0100] Based on the above α=180°-360° / the number of all suction and discharge components 14 in the two suction and discharge units, when there are 6 suction and discharge components 14 in each suction and discharge unit, the rotating shaft 12 has good dynamic balance and the hydraulic device has a low pulsation rate.

[0101] Please refer to Figure 8 As shown, in some embodiments of this application, the suction and discharge oil component 14 has a receiving cavity 143. When the cross-sectional area of ​​the receiving cavity 143 of all suction and discharge oil components 14 is equal, a plurality of eccentric wheels 13 are distributed at equal intervals along the circumference of the rotating shaft 12.

[0102] For example, when there are two eccentric wheels 13, each eccentric wheel 13 contacts the corresponding oil suction / discharge component 14 in the oil suction / discharge unit, and the eccentric directions of each eccentric wheel 13 are at an angle of 180°. Then, the resultant force on the rotating shaft 12 is 0.

[0103] For example, when there are three eccentric wheels 13, each eccentric wheel 13 contacts the corresponding oil suction / discharge component 14 in the oil suction / discharge unit. At this time, the eccentric directions of each eccentric wheel 13 are at a 120° angle, so the resultant force on the rotating shaft 12 is 0.

[0104] Please refer to Figure 3 , Figure 8 and Figure 10As shown, in some embodiments of this application, the housing 11 has a through hole 111 extending radially therefrom, the through hole 111 connecting the cavity and the outside of the housing 11; the housing 11 includes a support 144 and a plug 145, the support 144 is disposed in the through hole 111 of the housing 11, the plug 145 is fixedly disposed in the through hole 111 and located on the side of the support 144 away from the rotating shaft 12, the oil suction / discharge component 14 includes a plunger component 141 and a slipper 142, the plunger component... 141 is ball-jointed to support 144, and slipper 142 and plunger 141 are slidably connected. Slipper 142 and plunger 141 surround a receiving cavity 143 for absorbing hydraulic medium. The suction and discharge unit also includes a return ring 19, which connects the slippers 142 of all suction and discharge components 14 in the suction and discharge unit. When the eccentric wheel 13 rotates about the axis of the rotating shaft 12, at least one slipper 142 can move radially relative to the plunger 141 along the rotating shaft 12.

[0105] The plunger 141 is installed in the through hole of the housing 11. In this embodiment, the shape and size of the plunger 141 are not limited. In some embodiments, the plunger 141 has a receiving cavity 143, and a portion of the slipper 142 is slidably inserted into the receiving cavity 143. When the slipper 142 slides relative to the plunger 141, the hydraulic medium is drawn into the receiving cavity 143 by negative pressure. In other embodiments, the slipper 142 has a receiving cavity 143, and a portion of the plunger 141 is slidably inserted into the receiving cavity 143.

[0106] The slipper 142 is used to engage with the eccentric wheel 13. When the eccentric wheel 13 drives the plunger 141, the eccentric wheel 13 contacts the slipper 142, causing the slipper 142 to move radially away from the shaft 12 along the eccentric wheel 13. In some embodiments of this application, the slipper 142 includes a connecting part and a mating part. The connecting part and the plunger 141 are slidably connected. The mating part has a contact surface that slidably engages with the eccentric wheel 13. The contact surface is configured as an arc-shaped surface corresponding to the eccentric wheel 13. The return ring 19 is connected to the side of the mating part away from the shaft 12.

[0107] The slipper 142 in this embodiment may be made of wear-resistant material, such as wear-resistant metal or wear-resistant alloy; or, the surface of the slipper 142 may have a wear-resistant layer, such as a wear-resistant coating or an electroplated wear-resistant metal.

[0108] To achieve a sliding connection between the plunger 141 and the connecting part, in some examples, the connecting part is provided with a receiving groove, and a portion of the plunger 141 is slidably inserted into the receiving groove to close the groove opening and form a receiving cavity 143, thereby achieving a sliding connection between the plunger 141 and the connecting part.

[0109] Please refer to Figure 9 and Figure 10As shown, in some other embodiments of this application, the housing 11 has a through hole 111 extending radially therefrom (see reference). Figure 3 The through hole 111 connects the cavity and the outside of the housing 11; the suction and discharge component 14 includes a plunger 141 and a slipper 142, with the plunger 141 fixedly inserted into the through hole; the slipper 142 and the plunger 141 are slidably connected, and the plunger 141 can rotate relative to the slipper 142, with the slipper 142 and the plunger 141 surrounding a receiving cavity 143 for suctioning hydraulic medium; the suction and discharge unit also includes a return ring 19, which connects the slippers 142 of all suction and discharge components 14 in the suction and discharge unit; wherein, when the eccentric wheel 13 rotates around the axis of the rotating shaft 12, it can cause at least one slipper 142 to move relative to the plunger 141 along the radial direction of the eccentric wheel 12, and the return ring 19 can drive the remaining slippers 142 in the suction and discharge unit to move relative to the corresponding plunger 141.

[0110] In order to enable the connecting part to slide and rotate relative to the plunger 141, in some examples, a portion of the structure of the plunger 141 is configured as a ball head, the connecting part is provided with a receiving groove, and the ball head is disposed in a cylindrical groove. In this case, the ball head can slide and rotate relative to the plunger 141.

[0111] The return ring 19 is used to return the slipper 142. For example, the same suction and discharge unit includes a first suction and discharge group and a second suction and discharge group. The first suction and discharge group includes a first suction and discharge component, a second suction and discharge component, and a third suction and discharge component that are equally spaced along the rotating shaft 12. The second suction and discharge group includes a fourth suction and discharge component, a fifth suction and discharge component, and a sixth suction and discharge component that are equally spaced along the rotating shaft 12, and are circumferentially staggered with the first suction and discharge component, the second suction and discharge component, and the third suction and discharge component of the first suction and discharge group. The eccentric wheel 13 will simultaneously drive the first suction and discharge group. The slippers 142 of the three adjacent suction and discharge components in the second suction and discharge group move radially away from the rotating shaft 12, and the return ring simultaneously drives the slippers 142 of the remaining three adjacent suction and discharge components to move radially toward the rotating shaft 12; for example, simultaneously driving the slippers 142 of the first suction and discharge component, the fourth suction and discharge component, and the second suction and discharge component to move radially away from the rotating shaft 12, and the slippers 142 of the fifth suction and discharge component, the third suction and discharge component, and the sixth suction and discharge component to move radially toward the rotating shaft 12.

[0112] The return ring 19 is used to return the slipper 142 to its original position. For example, when the eccentric wheel 13 drives the slipper 142 of the first suction / discharge component of the first suction / discharge oil assembly to move away from the rotating shaft 12 radially, and the first suction / discharge component of the first suction / discharge oil assembly reaches its maximum stroke from its minimum stroke, the eccentric wheel 13 continues to rotate. The return ring 19 will then drive the first suction / discharge component to approach the rotating shaft 12 radially along the eccentric wheel 13. The first suction / discharge component of the first suction / discharge oil assembly will then return to its minimum stroke from its maximum stroke, thus returning to its original position. In other words, all suction / discharge components 14 in the same suction / discharge unit can be moved to the furthest point from the rotating shaft 12 by the eccentric wheel 13, and then driven to the closest point from the rotating shaft 12 by the return ring 19, achieving a reset. This simplifies the structure of the hydraulic device and improves its reliability.

[0113] All plunger components 141 can be moved to the farthest point from the rotating shaft 12 via the eccentric wheel 13, and driven to the closest point from the rotating shaft 12 via the return ring 19. The displacement curves of all plunger components 141 over time are consistent, approximately sinusoidal, but there are phase differences between them. Since the suction and discharge components in the same suction and discharge unit are arranged at equal intervals, the phase difference of the sinusoidal motion curves of each component is equal.

[0114] The number of return rings 19 can be multiple. Multiple return rings 19 can improve the reliability of the hydraulic device. Even if one of the return rings 19 is damaged, the remaining return rings 19 can still ensure that the eccentric wheel 13 can return the corresponding suction / discharge component 14 in the suction / discharge unit. Please refer to... Figure 9 , Figure 11 or Figure 12 As shown, there are two return rings 19, which are arranged along the axial direction of the rotating shaft 12.

[0115] After the slipper 142 moves radially away from the shaft 12 relative to the plunger 141 along the eccentric wheel 13, the suction and discharge member 14 draws the hydraulic medium into the accommodating cavity 143; however, the slipper 142 needs to return to its original position radially relative to the plunger 141 along the eccentric wheel 13 to discharge the hydraulic medium in the accommodating cavity 143 through the suction and discharge member 14 to the discharge passage 16A via the first check valve 15.

[0116] It is understood that in some embodiments of this application, an elastic element may be provided between the plunger 141 and the slipper 142. When the eccentric wheel 13 drives the slipper 142 to move radially away from the rotating shaft 12 relative to the plunger 141, the elastic element is gradually compressed. After the eccentric wheel 13 and the slipper 142 separate, the elastic element has elastic potential energy, which causes the slipper 142 to move radially toward the rotating shaft 12 to return to its original position.

[0117] Please refer to Figure 10As shown, in some embodiments of this application, the oil suction and discharge unit further includes a limiting member 20, the limiting member 20 and the slipper 142 are surrounded by a limiting groove 201, the limiting member 20 and the slipper 142 are fixedly connected, and the return ring 19 is partially located in the limiting groove 201.

[0118] The limiting member 20 is used to cooperate with the slipper 142 to limit the return ring 19, so as to realize the connection between the return ring 19 and the slipper 142. In this embodiment, the material, shape, etc. of the limiting member 20 are not limited, as long as the limiting member 20 and the slipper 142 can form a limiting groove 201 to limit the return ring 19.

[0119] Given that there are two return rings 19, in some embodiments of this application, the limiting member 20 and the slipper 142 are provided with two limiting grooves 201, which are arranged along the axial direction of the rotating shaft 12.

[0120] In some other embodiments of this application, the limiting groove 201 can be provided on the limiting member 20 to ensure the structural strength of the slipper 142.

[0121] In some embodiments of this application, the limiting groove 201 can also be provided on the slipper 142, giving the limiting member 20 higher structural strength. The limiting groove 201 is located on the slipper 142, and the cross-sectional shape of the limiting groove 201 can be an arc-shaped groove (see reference). Figure 11 As shown), it can also be a V-shaped groove, and the inner wall of the return ring 19 should also be set to correspond to the shape of the limiting groove 201.

[0122] In this embodiment, the limiting groove 201 can also be partially located on the limiting member 20 and partially on the sliding shoe 142. After the limiting member 20 and the sliding shoe 142 are connected, they form the limiting groove 201. Both the limiting member 20 and the sliding shoe 142 have sufficient structural strength.

[0123] In some embodiments of this application, the thickness of the return ring 19 is less than the depth of the limiting groove 201, so that the slip shoe 142 and the limiting member 20 can clamp the return ring 19 after they are connected, thereby fixing the return ring 19.

[0124] Please refer to Figure 12 or Figure 13As shown in some embodiments of this application, each suction / discharge unit includes two return rings 19. Along the axial direction of the rotating shaft 12, the two return rings 19 are respectively disposed on both sides of the connecting portion. At least one connector 30 connects the two return rings 19 within the same suction / discharge unit. When there are multiple connectors 30, the multiple connectors 30 are spaced apart circumferentially along the return rings 19. The two return rings 19 are connected together by the connectors 30. Along the axial direction of the rotating shaft 12, the two return rings 19 are respectively disposed on both sides of the connecting portion, and the connecting portion restricts the axial movement of the return rings 19 along the rotating shaft 12.

[0125] Please refer to Figure 12 As shown, in some examples, the return ring 19 and the connector 30 can be connected by a retaining ring, which facilitates the assembly of the return ring 19.

[0126] Please refer to Figure 13 As shown, in other examples, the return ring 19 and the connector 30 are integrated, improving the integration of the hydraulic system.

[0127] In some embodiments of this application, the hydraulic device further includes a controller electrically connected to the first control valve 17 and the second control valve 18. The controller can send control commands to the first control valve 17 and the second control valve 18 to control the on / off state of the first control valve 17 and the second control valve 18. For example, when the first control valve 17 is an electromagnetic relief valve, the second control valve 18 can be an electromagnetic switching valve or a high-speed switching valve.

[0128] In some other embodiments of this application, the hydraulic device further includes a controller electrically connected to the first control valve 17. The controller can send control commands to the first control valve 17 to control the opening and closing of the first control valve 17. For example, when the second control valve 18 is a check valve, the first control valve 17 can be a solenoid valve or a high-speed valve.

[0129] After adopting electromagnetic switching valves for the first control valve 17 and the second control valve 18, the current or voltage required for switching the valves can be significantly reduced, thus reducing power consumption; the control frequency of the electromagnetic switching valves is greatly reduced, which significantly reduces the control difficulty of the controller.

[0130] Please refer to Figure 14 As shown, in some embodiments of this application, the number of oil suction and discharge units is three. Along the axial direction of the rotating shaft 12, the housing 11 includes a front section 112 and a rear section 113 connected to each other. The front section 112 is provided with two oil suction and discharge units, and the rear section 113 is provided with one oil suction and discharge unit.

[0131] When there are a large number of oil suction and discharge units, the housing 11 is divided into a front section 112 and a rear section 113 along the axis of the rotating shaft 12. Multiple oil suction and discharge units are distributed on the front section 112 and the rear section 113. Multiple oil discharge channels 16A, which communicate with these units, are also distributed on the front section 112 and the rear section 113. Since the oil discharge channels 16A are located inside the housing 11, dividing the housing 11 into the front section 112 and the rear section 113 facilitates the manufacture of the oil discharge channels 16A. For example, the first to fourth oil discharge channels are located in the front section 112, and the fifth and sixth oil discharge channels are located in the rear section 113.

[0132] Please refer to Figure 15 As shown in some embodiments of this application, at least one suction / discharge oil assembly further includes at least one suction / discharge oil component 40. The suction / discharge oil component 40 is disposed on the housing 11 and connected to a second one-way valve 50. The second one-way valve 50 is connected to a third control valve 60 and a fourth control valve 70. The third control valve 60 connects to a cavity or an oil source, and the fourth control valve 70 connects to an external actuator. When the rotating shaft 12 rotates around its own axis, each eccentric wheel 13 drives the corresponding suction / discharge oil component 40 within its respective suction / discharge unit to operate.

[0133] Please refer to Figure 16 As shown, in some embodiments of this application, each of the remaining suction and discharge oil groups also includes at least one suction and discharge oil component 80. The suction and discharge oil component 80 is disposed in the housing 11. The number of suction and discharge oil components 40 in at least one suction and discharge oil group is equal to the number of suction and discharge oil components 80 in the remaining suction and discharge oil groups, and the suction and discharge oil component 80 is connected to the first one-way valve 15. When the rotating shaft 12 rotates around its own axis, each eccentric wheel 13 drives the suction and discharge oil component 80 in the corresponding suction and discharge oil unit to work. In this application, the external actuator can be a hydraulic cylinder, a hydraulic motor, etc.

[0134] The rotating shaft 12 drives multiple eccentric wheels 13 to rotate within the cavity. The eccentric wheels 13 drive the corresponding suction / discharge oil components 40 within the suction / discharge unit to operate. The second check valve 50 of the suction / discharge oil component 40 simultaneously connects to a third control valve 60 and a fourth control valve 70. When the third control valve 60 is open, the hydraulic medium flows back to the cavity or oil source through the third control valve 60. When the third control valve 60 is closed, the hydraulic medium enters the external actuator through the fourth control valve 70. Since the third control valve 60 and the suction / discharge oil component 40 are configured in a one-to-one correspondence, the opening or closing of the third control valve 60 can control whether the suction / discharge oil component 40 discharges oil. This allows the minimum adjustable discharge capacity of the suction / discharge oil group to be the discharge capacity of one suction / discharge oil component 40, and the maximum adjustable discharge capacity to be the sum of the discharge capacities of all suction / discharge oil components within the suction / discharge oil group. Similarly, the minimum adjustable discharge capacity of the hydraulic device is the discharge capacity of one suction / discharge oil component 40, and the maximum adjustable discharge capacity is the sum of the discharge capacities of all suction / discharge oil groups.

[0135] The working process of the suction and discharge component 3 80 is exactly the same as that of the suction and discharge component 14. The installation methods of the suction and discharge components 2 40 and 3 80 on the housing are exactly the same as those of the suction and discharge component 1. Therefore, please refer to the installation method of the suction and discharge component 1 on the housing. It will not be repeated here.

[0136] For example, such as Figure 15 and Figure 16 As shown, Figure 15 The oil suction and discharge unit shown can be a first oil suction and discharge unit, which includes a first oil suction and discharge group and a second oil suction and discharge group. Figure 16 The oil suction and discharge unit shown can be a second oil suction and discharge unit. The second oil suction and discharge unit includes a third oil suction and discharge group and a fourth oil suction and discharge group. The first and second oil suction and discharge groups are each composed of two oil suction and discharge components 14 and one oil suction and discharge component 40. The third and fourth oil suction and discharge groups are each composed of two oil suction and discharge components 14 and one oil suction and discharge component 80. The cross-sectional area of ​​all oil suction and discharge components in each oil suction and discharge group is equal. The cross-sectional area of ​​the oil suction and discharge components in the first, second, third, and fourth oil suction and discharge groups is equal. The number and stroke of the oil suction and discharge components in the first, second, third, and fourth oil suction and discharge groups are also equal. Assume the displacement of the suction and discharge components in the first, second, third, and fourth suction and discharge groups is B, and the number of suction and discharge components in each group is M. Then, the minimum displacement of the first suction and discharge group is B, and the maximum displacement is MB; the minimum displacement of the second suction and discharge group is B, and the maximum displacement is MB; the displacement of the third and fourth suction and discharge groups is fixed at MB; and the displacement of the fourth suction and discharge group is fixed at MB. Therefore, the minimum displacement of the hydraulic device is B, and the maximum displacement is 4MB.

[0137] If the displacement of the suction and discharge components are different, then the minimum displacement of the suction and discharge assembly is smaller, and the adjustment accuracy of the hydraulic device's displacement is higher.

[0138] The above are as follows Figure 15 and Figure 16 In the example shown, the second oil suction and discharge component 40 and the third oil suction and discharge component 80 are located in different oil suction and discharge units. It can be understood that the second oil suction and discharge component 40 and the third oil suction and discharge component 80 can also be located in the same oil suction and discharge unit.

[0139] It is understood that the hydraulic device also has multiple oil drain channels 16B. Each oil drain channel 16B connects to a second control valve 18 and a fourth control valve 70 within the same suction / discharge unit. The oil drain channel 16B can be an oil drain pipe located outside the housing 11; therefore, the shape of the oil drain channel 16B can be arbitrarily set. In this embodiment, the shape, length, and diameter of the oil drain channel 16B are not limited, as long as the oil drain channel 16B can connect to the second control valve 18 and at least one fourth control valve 70.

[0140] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A hydraulic device, characterized in that, include: A housing having a cavity that is connected to an external oil source; A rotating shaft, which is located within the cavity and is rotatably connected to the housing about its own axis; Multiple eccentric wheels are fixed on the rotating shaft and arranged along the axial direction of the rotating shaft. The axes of the eccentric wheels are parallel to the axis of the rotating shaft, and the multiple eccentric wheels are arranged at an angle to each other along the circumference of the rotating shaft. Multiple oil suction and discharge units are installed on the housing, each corresponding to one of the multiple eccentric wheels; each oil suction and discharge unit includes at least two sets of oil suction and discharge groups, each set of oil suction and discharge groups includes at least two oil suction and discharge components, each oil suction and discharge component is disposed on the housing, and each oil suction and discharge component is connected to a first one-way valve. Multiple first control valves, each first control valve being connected to a first check valve of a group of the oil suction and discharge groups, and the first control valve being connected to the cavity or an external oil source; and... Multiple second control valves, the second control valves being connected to a first check valve of a group of the oil suction and discharge groups, and the second control valves being connected to an external actuator; When the rotating shaft rotates around its own axis, each of the eccentric wheels drives the corresponding oil suction and discharge component in the oil suction and discharge unit to work.

2. The hydraulic device according to claim 1, characterized in that, The number of oil suction and discharge components in each group of oil suction and discharge units within the same oil suction and discharge unit is equal, and the oil suction and discharge components in the multiple groups of oil suction and discharge units within the same oil suction and discharge unit are staggered along the circumference of the rotating axis.

3. The hydraulic device according to claim 1, characterized in that, The housing also has multiple oil drain channels, each corresponding to the second control valve. Each oil drain channel is connected to the first check valve within the same oil suction and discharge assembly. The oil drain channel is also connected to the corresponding second control valve and the corresponding first control valve.

4. The hydraulic device according to claim 3, characterized in that, The first oil drain channel is arranged circumferentially around the rotating shaft. The center lines of the two first oil drain channels are located in the same cross section perpendicular to the axis of the rotating shaft. Along the radial direction of the rotating shaft, the two ends of one first oil drain channel are respectively spaced apart from the two ends of the other first oil drain channel.

5. The hydraulic device according to claim 1, characterized in that, The number of oil suction and discharge groups in different oil suction and discharge units is the same, and the installation positions of the corresponding oil suction and discharge components in the multiple oil suction and discharge groups in different oil suction and discharge units coincide along the axial direction of the rotating shaft.

6. The hydraulic device according to claim 1, characterized in that, At least two of the described suction and discharge oil groups have unequal displacement.

7. The hydraulic device according to claim 1, characterized in that, Along the axial direction of the rotating shaft, the difference 'a' between the total displacement of all the oil suction and discharge components in the two most end oil suction and discharge units is the smallest, and a ≥ 0.

8. The hydraulic device according to claim 1, characterized in that, At least two of the eccentric wheels have unequal eccentric distances.

9. The hydraulic device according to claim 1, characterized in that, The plurality of oil suction and discharge components in the oil suction and discharge unit are evenly distributed along the circumference of the rotating shaft. The plurality of eccentric wheels include a first eccentric wheel and a second eccentric wheel. The angle between the eccentric direction of the first eccentric wheel and the eccentric direction of the second eccentric wheel is α, (180°-360° / number of all oil suction and discharge components in the two oil suction and discharge units)≤α≤180°.

10. The hydraulic device according to claim 9, characterized in that, The plurality of eccentric wheels also includes a third eccentric wheel, the angle between the eccentric direction of the third eccentric wheel and the eccentric direction of the first eccentric wheel being β, where β = (-90° - 1 / 2α).

11. The hydraulic device according to claim 1, characterized in that, The number of oil suction and discharge units is three. Along the axial direction of the rotating shaft, the housing includes a front section and a rear section that are connected to each other. The front section is provided with two oil suction and discharge units, and the rear section is provided with one oil suction and discharge unit.

12. The hydraulic device according to claim 1, characterized in that, The housing has a through hole extending radially from itself, the through hole connecting the cavity and the outside of the housing; the housing includes: The support base is disposed within the through hole; A plug is fixedly disposed in the through hole and located on the side of the support seat opposite to the rotating shaft; The oil suction and discharge component includes: A plunger member, a portion of which is disposed within the through hole, and the plunger member is ball-jointed to the support seat; and, A sliding shoe includes a connecting part and a mating part that are connected to each other. The connecting part and the plunger are slidably connected along the radial direction of the eccentric wheel and surround a receiving cavity. The mating part has a contact surface that mates with the eccentric wheel, and the contact surface is configured as an arc-shaped surface corresponding to the eccentric wheel. The oil suction and discharge unit also includes: A return ring, wherein the return ring connects all the mating parts within the same oil suction and discharge unit, and the return ring and the mating parts are connected on the side away from the rotating shaft; When the eccentric wheel rotates around the axis of the rotating shaft, at least one of the slippers can move relative to the plunger member along the radial direction of the eccentric wheel, and the return ring can drive the remaining slippers in the oil suction and discharge unit to move relative to the corresponding plunger member.

13. The hydraulic device according to claim 1, characterized in that, The housing has a through hole extending radially from itself, the through hole connecting the cavity and the outside of the housing; the oil suction / discharge component includes: A plunger component is fixedly inserted into the through hole, and a ball head is provided at one end of the plunger component facing the rotating shaft; The sliding shoe includes a connecting part and a mating part that are connected to each other. The connecting part has a receiving groove at one end away from the rotating shaft. The ball head is disposed in the receiving groove to surround a receiving cavity for absorbing hydraulic medium. The mating part has a contact surface that mates with the eccentric wheel. The contact surface is configured as an arc-shaped surface corresponding to the eccentric wheel. The oil suction and discharge unit also includes: A return ring, wherein the return ring connects all the mating parts within the same oil suction and discharge unit, and the return ring and the mating parts are connected on the side away from the rotating shaft; When the eccentric wheel rotates around the axis of the rotating shaft, at least one of the slippers can move relative to the plunger member along the radial direction of the eccentric wheel, and the return ring can drive the remaining slippers in the oil suction and discharge unit to move relative to the corresponding plunger member.

14. The hydraulic device according to claim 12 or 13, characterized in that, The oil suction and discharge unit also includes: A limiting member is provided, and the limiting member and the mating part are surrounded by a limiting groove. The limiting member and the mating part are fixedly connected, and the return ring part is located in the limiting groove.

15. The hydraulic device according to claim 12 or 13, characterized in that, Each of the oil suction and discharge units includes two return rings, which are respectively disposed on both sides of the connecting part along the axial direction of the rotating shaft; at least one connector is connected between the two return rings in the same oil suction and discharge unit, and when there are multiple connectors, the multiple connectors are arranged at intervals along the circumference of the return rings.

16. The hydraulic device according to claim 15, characterized in that, The return loop and the at least one connector are integrally formed.

17. The hydraulic device according to claim 1 or 2, characterized in that, The at least one suction and discharge oil assembly further includes at least one suction and discharge oil component two, which is disposed in the housing. The suction and discharge oil component two is connected to a second one-way valve. The second one-way valve is connected to a third control valve and a fourth control valve. The third control valve is connected to a cavity or an oil source, and the fourth control valve is connected to an external actuator. Each of the remaining oil suction and discharge groups also includes at least one oil suction and discharge component three, which is disposed in the housing. The number of oil suction and discharge components two in the at least one oil suction and discharge group is equal to the number of oil suction and discharge components three in the remaining oil suction and discharge groups, and the oil suction and discharge component three is connected to the first one-way valve. When the rotating shaft rotates around its own axis, each of the eccentric wheels drives the oil suction / discharge component two and the oil suction / discharge component three in the corresponding oil suction / discharge unit to work.

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