Hydraulic device

Abstract

The invention relates to a hydraulic device, relates to the technical field of hydraulic equipment, and aims to solve the problem of how to improve the balance of a rotating shaft. The shell is provided with a cavity which is communicated with an external oil source; the rotating shaft is located in the cavity and rotationally connected to the shell around the axis of the rotating shaft. The eccentric wheels are fixed to the rotating shaft and arranged in the circumferential direction of the rotating shaft in an included angle mode. The plurality of oil suction and discharge units are mounted on the shell in one-to-one correspondence with the plurality of eccentric wheels; the oil suction and discharge unit comprises a plurality of oil suction and discharge parts, the oil suction and discharge unit comprises at least two oil suction and discharge groups, and each oil suction and discharge group comprises at least two oil suction and discharge parts; the oil suction and discharge parts comprise at least one first oil suction and discharge part and at least one second oil suction and discharge part, the first oil suction and discharge part is communicated with a first one-way valve, and the second oil suction and discharge part is communicated with a first control valve; the second control valve communicates with at least one first one-way valve; the third control valve is communicated with one second oil suction and discharge piece and is connected with the corresponding first control valve in parallel; the fourth control valve is connected with the second control valve in parallel.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic equipment, and in particular to a hydraulic device. Background Art

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

[0003] An embodiment of the present invention provides a hydraulic device, aiming to solve the problem of how to improve the balance of a rotating shaft.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] The embodiment of the present application provides a hydraulic device, which includes a housing, a rotating shaft, a plurality of eccentric wheels and a plurality of oil suction and discharge units, wherein the housing has a cavity connected to an external oil source; the rotating shaft is in the cavity and is connected to the housing by rotating around its own axis; the plurality of 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 plurality of eccentric wheels are arranged at an angle along the circumference of the rotating shaft; the plurality of oil suction and discharge units are mounted on the housing in a one-to-one correspondence with the plurality of eccentric wheels; the oil suction and discharge unit includes at least one group of the oil suction and discharge groups, and the oil suction and discharge group includes at least two oil suction and discharge parts; the plurality of oil suction and discharge parts include at least one first an oil suction and discharge part and at least one second oil suction and discharge part; the first oil suction and discharge part is connected with a first one-way valve; for the oil suction and discharge group including at least one first oil suction and discharge part, the first one-way valves corresponding to all the first oil suction and discharge parts in the oil suction and discharge group are connected with a second control valve and a fourth control valve, the fourth control valve is connected in parallel with the second control valve, and the second control valve is used to connect with the cavity or an external oil source; the second oil suction and discharge part is connected with a first control valve and a third control valve, the first control valve and the third control valve are connected in parallel, and the third control valve is used to connect with the cavity or an external oil source; wherein, when the rotating shaft rotates around its own axis, each of the eccentric wheels drives the oil suction and discharge parts in the corresponding oil suction and discharge unit to work.

[0006] Based on the hydraulic device provided in the embodiment of the present application, when the hydraulic device is working, the rotating shaft rotates to drive the oil suction and discharge parts in each oil suction and discharge unit to work, and the hydraulic medium in the shell cavity is pressurized and first transported to the first one-way valve. The hydraulic medium passes through multiple first one-way valves and then gathers to the second control valve. At this time, if the second control valve is opened, the hydraulic medium flows back to the cavity of the shell. If the second control valve is closed, the hydraulic medium enters the external actuator through the fourth control valve; similarly, when the hydraulic device is working, the hydraulic medium in the shell cavity is pressurized and first transported to the first control valve. If the third control valve is opened, the hydraulic medium flows back to the cavity of the shell. If the third control valve is closed, the hydraulic medium enters the external actuator through the first control valve.

[0007] The second control valve is connected to multiple first oil suction and discharge components. By turning the second control valve on or off, it can control whether the corresponding oil suction and discharge group discharges oil, thereby achieving step-by-step adjustment of the output flow of multiple oil suction and discharge groups. The minimum adjustable flow is the output flow of one first oil suction and discharge group, and the maximum adjustable flow is the output flow of all oil suction and discharge groups.

[0008] The third control valve is connected to a second oil suction and discharge component. By turning the third control valve on or off, it is possible to control whether the second oil suction and discharge component discharges oil, thereby enabling the output flow of multiple second oil suction and discharge components to be adjusted in a step-by-step manner. The minimum adjustable flow is the output flow of one second oil suction and discharge group, and the maximum adjustable flow is the output flow of all oil suction and discharge groups.

[0009] In the present application, multiple first control valves can be connected to an external actuator, multiple fourth control valves can be connected to an external actuator, or at least one first control valve and at least one fourth control valve can be connected to an external actuator structure to achieve output flow regulation.

[0010] By arranging multiple oil suction and discharge groups in one oil suction and discharge unit, arranging multiple oil suction and discharge parts in one oil suction and discharge group, and staggering the oil suction and discharge parts in different oil suction and discharge groups around the axial direction of the rotating shaft, the radial unbalanced force borne by the rotating shaft and the bearing can be greatly reduced when a single or multiple oil suction and discharge groups are in oil discharge operation.

[0011] In some embodiments of the present application, when there are multiple first oil suction and discharge parts in the same oil suction and discharge group, the hydraulic device also includes an oil discharge passage 1, which connects the first one-way valves corresponding to the multiple first oil suction and discharge parts, as well as the corresponding second control valves and the corresponding fourth control valves.

[0012] Based on the above embodiment, when there are multiple first oil suction and discharge components, the multiple first oil suction and discharge components are connected to the second control valve and the fourth control valve through the oil discharge passage 1.

[0013] In some embodiments of the present application, the oil drain passage 1 is arranged in the housing, the oil drain passage 1 is arranged around the circumference of the rotating shaft, and a plurality of the oil drain passages 1 are distributed along the axial direction of the rotating shaft.

[0014] Based on the above embodiment, assuming that the shell is formed by casting, a casting mold is placed at the oil drainage channel when the shell is cast. The two oil drainage channels of the shell overlap in the axial direction of the rotating shaft during the casting process. The less the overlapping parts along the circumferential direction of the rotating shaft, the less the overlapping parts of the casting mold along the circumferential direction of the rotating shaft. The molten metal fluid in the casting process is easier to flow through the gap between the overlapping parts of the casting mold along the circumferential direction of the rotating shaft. In this way, the shell casting has fewer defects and the structural strength of the shell is higher.

[0015] In some embodiments of the present application, the hydraulic device further includes an oil drain passage 2, which connects multiple first control valves corresponding to multiple second oil suction and discharge parts in the same oil suction and discharge group; or, connects at least one first control valve corresponding to at least one second oil suction and discharge part and at least one fourth control valve corresponding to at least one first oil suction and discharge part in the same oil suction and discharge group.

[0016] Based on the above embodiment, the oil drain passage 2 is connected to multiple first control valves, that is, the oil drain passage 2 is connected to multiple second oil suction and discharge parts, and the hydraulic device adjusts its own output flow; after the oil drain passage 2 is connected to at least one first control valve and at least one fourth control valve, that is, the oil drain passage 2 is connected to at least one second oil suction and discharge part and at least one first oil suction and discharge part, the hydraulic device adjusts its own output flow.

[0017] In some embodiments of the present application, a second one-way valve is provided between the intersection of the first control valve and the third control valve in parallel and the second oil suction and discharge member.

[0018] Based on the above embodiment, a second one-way valve is provided between the intersection of the first control valve and the third control valve in parallel and the second oil suction and discharge member, that is, the outlet of the second oil suction and discharge member is connected to the second one-way valve. At this time, combined with the outlet of the first oil suction and discharge member being connected to the first one-way valve, the structure of the hydraulic device is symmetrical, and the components of the hydraulic device have a high degree of versatility and standardization.

[0019] In some embodiments of the present application, the number of the oil suction and discharge parts in the multiple oil suction and discharge groups in the same oil suction and discharge unit is equal, and all the oil suction and discharge parts in the multiple oil suction and discharge groups in the same oil suction and discharge unit are staggered along the circumference of the rotating shaft.

[0020] Based on the above embodiment, when the corresponding eccentric wheels rotate around the axis of the rotating shaft, the oil suction and discharge components in the multiple oil suction and discharge groups are driven alternately, and hydraulic medium can be continuously supplied to the multiple oil suction and discharge groups in sequence.

[0021] At the same time, the oil suction and discharge parts in different oil suction and discharge groups are staggered around the axial direction of the rotating shaft. In this way, when a single or multiple oil suction and discharge groups are working in oil discharge, the radial unbalanced force borne by the rotating shaft can be further significantly reduced, that is, the rotating shaft has better balance.

[0022] In some embodiments of the present application, the number of the oil suction and discharge parts in the multiple oil suction and discharge groups in different oil suction and discharge units is equal, and the corresponding oil suction and discharge parts in the multiple oil suction and discharge groups in different oil suction and discharge units overlap along the axial direction of the rotating shaft.

[0023] Based on the above embodiment, at this time, assuming that the number of eccentric wheels is two, the two eccentric wheels include a first eccentric wheel and a second eccentric wheel, the force applied to the first eccentric wheel by the oil suction and discharge component corresponding to the first eccentric wheel, and the force applied to the second eccentric wheel by the oil 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 oil suction and discharge components offset each other, and the rotating shaft is completely balanced.

[0024] In some embodiments of the present application, the oil suction and discharge member has an accommodating cavity, and the cross-sections of the accommodating cavities of the oil suction and discharge members in at least two groups of the oil suction and discharge units in the plurality of the oil suction and discharge units are different.

[0025] Based on the above embodiment, when the cross-sectional areas of the accommodating chambers of the oil suction and discharge parts in multiple oil suction and discharge units are not equal, the output flow rate of the oil suction and discharge part with a smaller cross-sectional area of ​​the accommodating chamber is naturally smaller, and the output flow rate of the oil suction and discharge part with a larger cross-sectional area of ​​the accommodating chamber is naturally larger. The oil discharge passage connects the oil suction and discharge parts with different cross-sectional areas to form oil suction and discharge groups with different output flow rates. The oil suction and discharge parts with a smaller cross-sectional area of ​​the accommodating chamber facilitate the hydraulic device to adjust the accuracy of the output flow rate.

[0026] In some embodiments of the present application, the oil suction and discharge member has a accommodating cavity, the oil suction and discharge unit has multiple oil suction and discharge members, the multiple oil suction and discharge members are divided into multiple oil suction and discharge groups, and the cross-sections of the accommodating cavities of the oil suction and discharge members in at least two groups of the oil suction and discharge groups are not equal.

[0027] Based on the above embodiment, when the cross-sectional areas of the accommodating chambers of the oil suction and discharge parts in multiple oil suction and discharge groups are not equal, the output flow rate of the oil suction and discharge part with a smaller cross-sectional area of ​​the accommodating chamber is naturally smaller, and the output flow rate of the oil suction and discharge part with a larger cross-sectional area of ​​the accommodating chamber is naturally larger. The oil discharge passage connects the oil suction and discharge parts with different cross-sectional areas to form oil suction and discharge groups with different output flow rates. The oil suction and discharge parts with a smaller cross-sectional area of ​​the accommodating chamber facilitate the hydraulic device to adjust the accuracy of the output flow rate.

[0028] In some embodiments of the present application, the eccentric distances of at least two of the eccentric wheels are not equal.

[0029] Based on the above embodiment, when the eccentric distances of the eccentric wheels are not equal, the moving strokes of the oil suction and discharge parts in the corresponding oil suction and discharge units are not equal. The output flow of the oil suction and discharge parts with a short moving stroke is naturally small, and the output flow of the oil suction and discharge parts with a short moving stroke is naturally large. The oil discharge passage connects different oil suction and discharge parts to form oil suction and discharge groups with different output flow rates. The oil suction and discharge parts with a smaller output flow rate facilitate the hydraulic device to adjust the accuracy of the output flow rate.

[0030] In some embodiments of the present application, the oil suction and discharge parts in the oil suction and discharge unit are evenly spaced along the circumference of the rotating shaft, and the 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, α = 180°-360° / the number of all the oil suction and discharge parts in the two oil suction and discharge units.

[0031] Based on the above embodiment, the setting of the angle between the eccentric direction of the first eccentric wheel and the eccentric direction of the second eccentric wheel only considers the continuity of the output flow; the angle between the eccentric direction of the first eccentric wheel and the eccentric direction of the second eccentric wheel makes the second eccentric wheel contact the oil suction and discharge part in the corresponding oil suction and discharge unit when the first eccentric wheel is separated from the oil suction and discharge part in the corresponding oil suction and discharge unit, and the first eccentric wheel contact the oil suction and discharge part in the corresponding oil suction and discharge unit when the second eccentric wheel is separated from the oil suction and discharge part in the corresponding oil suction and discharge unit, so that the output flow of the hydraulic device has good continuity.

[0032] In some embodiments of the present application, the plurality of eccentric wheels further include a third eccentric wheel, and 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.

[0033] Based on the above embodiment, when the first eccentric wheel and the second eccentric wheel fail to balance the rotating shaft, a third eccentric wheel is provided on the rotating shaft, and 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 first eccentric wheel and the second eccentric wheel are balanced by the third eccentric wheel, so that the resultant force acting on the rotating shaft is 0 or reduced.

[0034] In some embodiments of the present application, each group of the oil suction and discharge units includes 6 oil suction and discharge parts, and 150°≤α≤180°.

[0035] Based on the above embodiment, when the angle between the first eccentric wheel and the second eccentric wheel is 180°, the external force on the rotating shaft is 0, and the balance of the rotating shaft is the best. There are 6 oil suction and discharge parts in each group of oil suction and discharge units. When the angle between the eccentric direction of the first eccentric wheel and the eccentric direction of the second eccentric wheel is 150°, the output flow of the hydraulic device has the best continuity. Therefore, each group of the oil suction and discharge units includes 6 oil suction and discharge parts. When 150°≤α≤180°, the rotating shaft of the hydraulic device has good balance, and the output flow of the hydraulic device also has good continuity.

[0036] In some embodiments of the present application, the oil suction and discharge member includes a plunger member and a sliding shoe, the sliding shoe and the plunger member are slidably connected, the plunger member is rotatably installed on the housing, and the sliding shoe and the plunger member are surrounded by a accommodating cavity for absorbing hydraulic medium; the oil suction and discharge unit also includes a return ring, which connects the sliding shoes of all oil suction and discharge members in the oil suction and discharge unit; wherein, when the eccentric wheel rotates around the axis of the rotating shaft, the sliding shoe can move relative to the plunger member along the radial direction of the rotating shaft.

[0037] Based on the above embodiment, when the eccentric wheel rotates around the axis of the rotating shaft, it pushes the sliding shoe to move radially away from the rotating shaft. When the eccentric wheel rotates to the sliding shoe of the next oil suction and discharge component, it can drive the sliding shoes of the remaining oil suction and discharge components to move radially along the rotating shaft through the return ring. When the eccentric wheel rotates through the moving angle, the sliding shoe can be restored to its original position.

[0038] In some embodiments of the present application, the sliding shoe includes a connecting portion and a mating portion that are interconnected, the connecting portion and the plunger member are slidably connected along the radial direction of the rotating shaft, and are surrounded by the accommodating cavity, the mating portion has a contact surface that cooperates with the eccentric wheel, and the contact surface is set as an arc surface corresponding to the eccentric wheel, and the return ring and the mating portion are connected away from the side of the rotating shaft.

[0039] Based on the above embodiment, the sliding shoe includes a connecting portion and a matching portion that are connected to each other, the connecting portion and the plunger member are connected in a radial sliding manner along the rotating shaft, and are surrounded by the accommodating cavity, the matching portion has a contact surface that matches the eccentric wheel, and the contact surface is set as an arc surface corresponding to the eccentric wheel, and the return ring and the matching portion are connected away from the side of the rotating shaft.

[0040] In some embodiments of the present application, the oil suction and discharge unit further includes a limiting member, the limiting member and the sliding shoe are surrounded by a limiting groove, the limiting member and the sliding shoe are fixedly connected, and the return ring is partially located in the limiting groove.

[0041] Based on the above embodiment, the groove wall of the limiting groove can limit the axial movement of the return ring in the rotating shaft, and the limiting member and the sliding shoe are connected to clamp the return ring to fix the return ring.

[0042] Beneficial effects of the present invention:

[0043] 1. The second control valve is connected to multiple first oil suction and discharge components. By turning the second control valve on or off, it can control whether the corresponding oil suction and discharge group discharges oil, thereby achieving step-by-step adjustment of the output flow of multiple oil suction and discharge groups. The minimum adjustable flow is the output flow of one first oil suction and discharge group, and the maximum adjustable flow is the output flow of all oil suction and discharge groups.

[0044] The third control valve is connected to a second oil suction and discharge component. By turning the third control valve on or off, it is possible to control whether the second oil suction and discharge component discharges oil, thereby enabling the output flow of multiple second oil suction and discharge components to be adjusted in a step-by-step manner. The minimum adjustable flow is the output flow of one second oil suction and discharge group, and the maximum adjustable flow is the output flow of all oil suction and discharge groups.

[0045] In an embodiment of the present application, multiple first control valves can be connected to an external actuator, multiple fourth control valves can be connected to an external actuator, or at least one first control valve and at least one fourth control valve can be connected to an external actuator to achieve regulation of the output flow.

[0046] By arranging multiple oil suction and discharge groups in one oil suction and discharge unit, arranging multiple oil suction and discharge parts in one oil suction and discharge group, and staggering the oil suction and discharge parts in different oil suction and discharge groups around the axial direction of the rotating shaft, the radial unbalanced force borne by the rotating shaft and the bearing can be greatly reduced when a single or multiple oil suction and discharge groups are in oil discharge operation.

[0047] 2. When the cross-sectional areas of the accommodating cavities of the oil suction and discharge components in multiple oil suction and discharge units are different, the output flow rate of the oil suction and discharge component with a smaller accommodating cavity cross-sectional area is naturally smaller, and the output flow rate of the oil suction and discharge component with a larger accommodating cavity cross-sectional area is naturally larger. The oil discharge passage connects the oil suction and discharge components with different cross-sectional areas to form oil suction and discharge groups with different output flow rates. The oil suction and discharge component with a smaller accommodating cavity cross-sectional area facilitates the accuracy of adjusting the output flow rate by the hydraulic device.

[0048] 3. When the eccentric distances of the eccentric wheels are not equal, the moving strokes of the oil suction and discharge parts in the corresponding oil suction and discharge units are not equal. The output flow of the oil suction and discharge parts with a shorter moving stroke is naturally smaller, and the output flow of the oil suction and discharge parts with a shorter moving stroke is naturally larger. Once the oil discharge passage is connected to different oil suction and discharge parts, oil suction and discharge groups with different output flow rates can be formed. The oil suction and discharge parts with a smaller output flow rate make it easier for the hydraulic device to adjust the accuracy of the output flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a schematic diagram of the structure of the hydraulic device in some embodiments of the present application.

[0050] Figure 2This is a schematic diagram of the structure after the rotating shaft and eccentric wheel are connected in some embodiments of the present application.

[0051] Figure 3 for Figure 1 The cross-sectional structural diagram of the hydraulic device shown.

[0052] Figure 4 This is a schematic diagram of the connection of hydraulic device pipelines in some embodiments of the present application.

[0053] Figure 5 This is a schematic diagram of the connection of hydraulic device pipelines in other embodiments of the present application.

[0054] Figure 6 This is a schematic structural diagram of the eccentric wheel driving the oil suction and discharge parts in some embodiments of the present application.

[0055] Figure 7 This is a schematic diagram of the connection between the limit member, the return ring and the sliding shoe in some embodiments of the present application.

[0056] Figure 8 This is a schematic diagram of the partial connection between the sliding shoe and the return ring in some embodiments of the present application.

[0057] Reference numerals:

[0058] 11. Housing; 12. Rotating shaft; 13. Eccentric wheel; 131. Oil suction groove; 14A. First oil suction and discharge member; 14B. Second oil suction and discharge member; 141. Plunger member; 142. Sliding shoe; 143. Accommodating chamber; 15A. First one-way valve; 15B. First control valve; 15C. Fourth control valve; 16A. Oil discharge channel 1; 16B. Oil discharge channel 2; 17A. Second control valve; 17B. Third control valve; 19. Return ring; 20. Limiting member; 201. Limiting groove; 30. Second one-way valve. DETAILED DESCRIPTION

[0059] In order to enable ordinary people in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0060] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0061] To solve the above problems, first of all, please refer to Figure 1 、 Figure 2 、 Figure 3 as well as Figure 4 As shown, or please refer to Figure 1 、 Figure 2 、 Figure 3 as well as Figure 5 As shown, an embodiment of the present application provides a hydraulic device, which includes a housing 11, a rotating shaft 12, a plurality of eccentric wheels 13 and a plurality of oil suction and discharge units. The housing 11 has a cavity, which is connected to an external oil source; the rotating shaft 12 is in the cavity and is connected to the housing 11 by rotating around its own axis; the plurality of eccentric wheels 13 are fixed to the rotating shaft 12 and arranged along the axial direction of the rotating shaft 12, the axes of the eccentric wheels 13 are parallel to the axis of the rotating shaft 12, and the plurality of eccentric wheels 13 are arranged at an angle along the circumference of the rotating shaft 12; the plurality of oil suction and discharge units are mounted on the housing 11 in a one-to-one correspondence with the plurality of eccentric wheels 13; the oil suction and discharge units include at least one oil suction and discharge group, the oil suction and discharge group includes at least two oil suction and discharge parts; the plurality of oil suction and discharge parts include at least one first oil suction and discharge part 14A and at least one second The oil suction and discharge component 14B; the first oil suction and discharge component 14A is connected to the first one-way valve 15A. For the oil suction and discharge group including at least one first oil suction and discharge component 14A, the first one-way valves 15A corresponding to all the first oil suction and discharge components 14A in the oil suction and discharge group are connected to the second control valve 17A and the fourth control valve 15C. The fourth control valve 15C is connected in parallel with the second control valve 17A. The second control valve 17A is used to connect to the cavity or an external oil source; the second oil suction and discharge component 14B is connected to the first control valve 15B and the third control valve 17B. The first control valve 15B and the third control valve 17B are connected in parallel. The third control valve 17B is used to connect to the cavity or an external oil source; wherein, when the rotating shaft 12 rotates around its own axis, each eccentric wheel 13 drives the oil suction and discharge components in the corresponding oil suction and discharge unit to work.

[0062] In the embodiment of the present application, a bearing is provided between the rotating shaft 12 and the housing 11. The rotating shaft 12 and the inner ring of the bearing are fixedly connected, and the housing 11 and the outer ring of the bearing are fixedly connected, so that the rotating shaft 12 can rotate relative to the housing 11. There are two bearings, which are respectively located at both ends of the rotating shaft 12.

[0063] The rotating shaft 12 is used to drive the eccentric wheel 13 to rotate. Figure 2 As shown, the rotating shaft 12 is provided with two eccentric wheels 13 arranged along the axial direction of the rotating shaft 12. The two eccentric wheels 13 are arranged opposite to each other along the circumference of the rotating shaft 12. The eccentric wheels 13 are provided with an oil suction groove 131. When the rotating shaft 12 drives the oil suction and discharge member 14, there is hydraulic medium in the oil suction groove 131, and the oil suction and discharge member 14 absorbs the hydraulic medium in the oil suction groove 131.

[0064] Based on the hydraulic device provided in the embodiment of the present application, when the hydraulic device is working, the rotating shaft 12 rotates to drive the oil suction and discharge parts in each oil suction and discharge unit to work, and the hydraulic medium in the cavity of the shell 11 is pressurized and first transported to the first one-way valve 15A. The hydraulic medium passes through multiple first one-way valves 15A and then gathers to the second control valve 17A. At this time, if the second control valve 17A is opened, the hydraulic medium flows back to the cavity of the shell 11. If the second control valve 17A is closed, the hydraulic medium enters the external actuator through the fourth control valve 15C; similarly, when the hydraulic device is working, the hydraulic medium in the cavity of the shell 11 is pressurized and first transported to the first control valve 15B. If the third control valve 17B is opened, the hydraulic medium flows back to the cavity of the shell 11. If the third control valve 17B is closed, the hydraulic medium enters the external actuator through the first control valve 15B.

[0065] The second control valve 17A is connected to multiple first oil suction and discharge components 14A. By turning the second control valve 17A on or off, it can control whether the corresponding oil suction and discharge group discharges oil, thereby achieving step-by-step adjustment of the output flow rates of the multiple oil suction and discharge groups. The minimum adjustable flow rate is the output flow rate of one first oil suction and discharge group, and the maximum adjustable flow rate is the output flow rate of all oil suction and discharge groups.

[0066] The third control valve 17B is connected to a second oil suction and discharge member 14B. By turning the third control valve 17B on or off, it is possible to control whether the second oil suction and discharge member 14B discharges oil. This allows the output flow rates of multiple second oil suction and discharge members 14B to be adjusted in a step-by-step manner. The minimum adjustable flow rate is the output flow rate of one second oil suction and discharge group, and the maximum adjustable flow rate is the output flow rate of all oil suction and discharge groups.

[0067] In the present application, multiple first control valves 15B can be connected to an external actuator, multiple fourth control valves 15C can be connected to an external actuator, or at least one first control valve 15B and at least one fourth control valve can be connected to an external actuator to achieve output flow regulation.

[0068] By arranging multiple oil suction and discharge groups in one oil suction and discharge unit, and arranging multiple oil suction and discharge parts in one oil suction and discharge group, and staggering the oil suction and discharge parts in different oil suction and discharge groups around the axial direction of the rotating shaft 12, the radial unbalanced force on the rotating shaft 12 and the bearing can be greatly reduced when a single or multiple oil suction and discharge groups are in oil discharge operation.

[0069] Please refer to Figure 4 or Figure 5 As shown, in some embodiments of the present application, when there are multiple first oil suction and discharge parts 14A in the same oil suction and discharge group, the hydraulic device also includes an oil discharge passage 16A, and the oil discharge passage 16A is connected to the first one-way valves 15A corresponding to the multiple first oil suction and discharge parts 14A, as well as the corresponding second control valves 17A and the corresponding fourth control valves 15C.

[0070] The oil drain passage 16A is used to connect the second control valve 17A and the corresponding multiple first one-way valves 15A. In the embodiment of the present application, there is no limitation on the shape, length, pipe diameter, etc. of the oil drain passage 16A, as long as the oil drain passage 16A can connect the multiple first oil suction and discharge parts 14A in the same group.

[0071] For example, in some embodiments of the present application, the hydraulic device includes a first oil suction and discharge unit and a second oil suction and discharge unit, 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, and the oil discharge passage 16A includes a first oil discharge passage, a second oil discharge passage, a third oil discharge passage, and a fourth oil discharge passage; the first oil discharge passage connects all first oil suction and discharge parts 14A in the first oil suction and discharge group, the second oil discharge passage connects all first oil suction and discharge parts 14A in the second oil suction and discharge group, the third oil discharge passage connects all first oil suction and discharge parts 14A in the third oil suction and discharge group, and the fourth oil discharge passage connects all first oil suction and discharge parts 14A in the fourth 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 oil suction and discharge unit and the second oil suction and discharge unit, and the third oil discharge passage and the fourth oil discharge passage are located on the side of the second oil suction and discharge unit away from the first oil suction and discharge unit.

[0072] For another example, in some embodiments of the present application, the hydraulic device includes a first oil suction and discharge unit, a second oil suction and discharge unit, and a third oil suction and discharge unit, 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 third oil suction and discharge unit includes a fifth oil suction and discharge group and a sixth oil suction and discharge group, and a plurality of oil discharge passages 16A include a first oil discharge passage, a second oil discharge passage, a third oil discharge passage, a fourth oil discharge passage, a fifth oil discharge passage, and a sixth oil discharge passage; the first oil discharge passage connects all the oil suction and discharge parts in the first oil suction and discharge group, the second oil discharge passage connects all the oil suction and discharge parts in the second oil suction and discharge group, the third oil discharge passage connects all the oil suction and discharge parts in the third oil suction and discharge group, the fourth oil discharge passage connects all the oil suction and discharge parts in the fourth oil suction and discharge group, the fifth oil discharge passage connects all the oil suction and discharge parts in the fifth oil suction and discharge group, and the sixth oil discharge passage connects all the oil suction and discharge parts 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 oil suction and discharge unit and the second oil suction and discharge unit, the third oil discharge passage and the fourth oil discharge passage are located between the second oil suction and discharge unit and the third oil suction and discharge unit, and the fifth oil discharge passage and the sixth oil discharge passage are located on the side of the third oil suction and discharge unit away from the first oil suction and discharge unit.

[0073] Please refer to Figure 4 or Figure 5As shown, in some embodiments of the present application, oil discharge passage 16A is connected to the first oil suction and discharge member 14A in the same oil suction and discharge unit. When the rotating shaft 12 rotates, the first oil suction and discharge member 14A in the oil suction and discharge unit is sequentially driven to continuously supply hydraulic medium to the oil discharge passage 16A.

[0074] Please refer to Figure 4 or Figure 5 As shown, in some embodiments of the present application, the second oil discharge passage 16B is connected to multiple first control valves 15B corresponding to multiple second oil suction and discharge components 14B in the same oil suction and discharge group; or, is connected to at least one first control valve 15B corresponding to at least one second oil suction and discharge component 14B and at least one fourth control valve 15C corresponding to at least one first oil suction and discharge component 14A in the same oil suction and discharge group.

[0075] The second oil drain passage 16B is connected to multiple first control valves 15B, that is, the second oil drain passage 16B is connected to multiple second oil suction and discharge parts 14B, realizing step-by-step adjustment of the output flow of the hydraulic device, and the second oil drain passage 16B is connected to different numbers of first control valves 15B, and the output flow of the second oil drain passage 16B is different; after the second oil drain passage 16B is connected to the first control valve 15B and at least one fourth control valve 15C, the step-by-step adjustment of the output flow of the hydraulic device is also realized. Similarly, the second oil drain passage 16B is connected to different numbers of first control valves 15B and different numbers of fourth control valves 15C, and the number and flow of the second oil drain passage 16B are different.

[0076] Similarly, in the embodiment of the present application, there is no limitation on the shape, length, diameter, etc. of the second oil drain passage 16B, as long as the second oil drain passage 16B can connect multiple first control valves 15B or at least one first control valve 15B and at least one fourth control valve 15C.

[0077] For example, the second oil discharge passage 16B may be connected to two first control valves 15B, or may be connected to two fourth control valves 15C, or may be connected to one first control valve 15B and two fourth control valves 15C.

[0078] Please refer to Figure 5 As shown, in some embodiments of the present application, a second one-way valve 30 is disposed between the second oil suction and discharge member 14B and the intersection of the first and third control valves 15B and 17B. This arrangement means that the outlet of the second oil suction and discharge member 14B is connected to the second one-way valve 30. In this case, the outlet of the first oil suction and discharge member 14A is connected to the first one-way valve 15A, resulting in a symmetrical structure for the hydraulic device.

[0079] In some embodiments of the present application, the number of oil suction and discharge components in multiple oil suction and discharge groups in the same oil suction and discharge unit is equal, and all oil suction and discharge components in multiple oil suction and discharge groups in the same oil suction and discharge unit are staggered along the circumference of the rotating shaft 12.

[0080] When the corresponding eccentric wheel 13 rotates around the axis of the rotating shaft 12, the eccentric wheel 13 alternately drives the oil suction and discharge components in the two oil suction and discharge groups to continuously supply hydraulic medium to the first oil suction and discharge component 14A or the second oil suction and discharge component 14B in turn.

[0081] Of course, it is understandable that the multiple oil suction and discharge parts within the multiple oil suction and discharge groups can also be arranged arbitrarily. For example, the oil suction and discharge unit includes multiple first oil suction and discharge parts 14A and multiple second oil suction and discharge parts 14B, and the multiple first oil suction and discharge parts 14A and the multiple second oil suction and discharge parts 14B are arbitrarily arranged along the circumference of the rotating shaft 12.

[0082] In some embodiments of the present application, the number of oil suction and discharge components in multiple oil suction and discharge groups in different oil suction and discharge units is equal, and the corresponding oil suction and discharge components in multiple oil suction and discharge groups in different oil suction and discharge units overlap along the axial direction of the rotating shaft 12 .

[0083] For example, there are two eccentric wheels 13, and the two eccentric wheels 13 include a first eccentric wheel and a second eccentric wheel. The force applied to the first eccentric wheel by the oil suction and discharge component corresponding to the first eccentric wheel and the force applied to the second eccentric wheel by the oil 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 12 by the two oil suction and discharge components offset each other, and the rotating shaft 12 is completely balanced.

[0084] In some embodiments of the present application, the eccentric wheel 13 can simultaneously drive multiple adjacent oil suction and discharge components in the corresponding oil suction and discharge unit. In this way, hydraulic medium can be supplied to two oil suction and discharge components at the same time, thereby increasing the output flow of the hydraulic device.

[0085] When the above-mentioned oil suction and discharge unit includes multiple oil suction and discharge groups, the oil suction and discharge members in the multiple oil suction and discharge groups are arranged in a staggered manner. In this case, the eccentric wheel 13 can simultaneously supply hydraulic medium to multiple first oil suction and discharge members 14A or multiple second oil suction and discharge members 14B in the same oil suction and discharge unit during the rotation process around the axis of the rotating shaft 12.

[0086] In some embodiments of the present application, the oil discharge passage 16A is connected to at least one first oil suction and discharge member 14A in the same oil suction and discharge unit.

[0087] When the oil discharge passage 16A is connected to the first oil suction and discharge member 14A in the same oil suction and discharge unit, the hydraulic medium entering the oil discharge passage 16A is more continuous because the first oil suction and discharge members 14A in the same oil suction and discharge unit are arranged along the circumference of the rotating shaft 12, that is, the multiple first oil suction and discharge members 14A in the same oil suction and discharge unit operate sequentially.

[0088] In some other embodiments of the present application, the oil discharge passage 16A is connected to at least two first oil suction and discharge members 14A in different oil suction and discharge units.

[0089] When the oil discharge passage 16A is connected to the first oil suction and discharge components 14A in different oil suction and discharge units, if the connected first oil suction and discharge components 14A operate simultaneously, hydraulic medium can be quickly supplied to the oil discharge passage 16A in a short period of time; if multiple connected first oil suction and discharge components 14A operate sequentially, the hydraulic medium entering the oil discharge passage 16A is more continuous.

[0090] In some embodiments of the present application, the oil suction and discharge member has an accommodating cavity 143 , and the cross-sections of the accommodating cavities 143 of the oil suction and discharge members in at least two groups of oil suction and discharge units in the plurality of oil suction and discharge units are different.

[0091] When the cross-sectional areas of the accommodating chambers 143 of the oil suction and discharge parts in multiple oil suction and discharge units are not equal, the output flow of the oil suction and discharge part with a smaller cross-sectional area of ​​the accommodating chamber 143 is naturally smaller, and the output flow of the oil suction and discharge part with a larger cross-sectional area of ​​the accommodating chamber 143 is naturally larger. The oil discharge passage 16A connects the oil suction and discharge parts with different cross-sectional areas to form oil suction and discharge groups with different output flow rates. The oil suction and discharge part with a smaller cross-sectional area of ​​the accommodating chamber 143 facilitates the hydraulic device to adjust the accuracy of the output flow rate.

[0092] For example, the plurality of oil suction and discharge units include a first oil suction and discharge unit corresponding to the first eccentric wheel and a second oil suction and discharge unit corresponding to the second eccentric wheel. The ratio of the cross-section of the accommodating cavity 143 of the oil suction and discharge member in the first oil suction and discharge unit to the cross-section of the accommodating cavity 143 of the oil suction and discharge member in the second oil suction and discharge unit is 0.5A. Assuming that the output flow of the oil suction and discharge member in one stroke of the first oil suction and discharge unit is A, at this time, the oil discharge passage 16A can connect an oil suction and discharge member in the first oil suction and discharge unit and an oil suction and discharge member in the second oil suction and discharge unit to form an oil suction and discharge group with an output flow of 1.5A. The oil discharge passage 16A can connect an oil suction and discharge member in the first oil suction and discharge unit to form an oil suction and discharge group with an output flow of A. The oil discharge passage 16A can connect an oil suction and discharge member in the second oil suction and discharge unit to form an oil suction and discharge group with an output flow of A, thereby realizing the adjustment of the flow accuracy.

[0093] It is understandable that the cross-sections of the accommodating cavities 143 of the oil suction and discharge members in the plurality of oil suction and discharge units may also be equal.

[0094] In some embodiments of the present application, the oil suction and discharge component has a accommodating cavity 143, and the oil suction and discharge unit has multiple oil suction and discharge components, and the multiple oil suction and discharge components are divided into multiple oil suction and discharge groups, and the areas of the accommodating cavities 143 of the oil suction and discharge components in at least two oil suction and discharge groups are not equal.

[0095] When the cross-sectional areas of the accommodating chambers 143 of the oil suction and discharge parts in multiple oil suction and discharge groups are not equal, the output flow rate of the oil suction and discharge part with a smaller cross-sectional area of ​​the accommodating chamber 143 is naturally smaller, and the output flow rate of the oil suction and discharge part with a larger cross-sectional area of ​​the accommodating chamber 143 is naturally larger. The oil discharge passage 16A connects the oil suction and discharge parts with different cross-sectional areas to form oil suction and discharge groups with different output flow rates. The oil suction and discharge parts with a smaller cross-sectional area of ​​the accommodating chamber 143 facilitate the hydraulic device to adjust the accuracy of the output flow rate.

[0096] 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 ratio of the cross-section of the accommodating cavity 143 of the oil suction and discharge member in the first oil suction and discharge group to the cross-section of the accommodating cavity 143 of the oil suction and discharge member in the second oil suction and discharge group is 0.5. Assuming that the output flow of the oil suction and discharge member in one stroke of the first oil suction and discharge group is B, at this time, the oil discharge channel 16A can be connected to an oil suction and discharge member in the first oil suction and discharge group and an oil suction and discharge member in the second oil suction and discharge group to form an oil suction and discharge group with an output flow of 1.5B, the oil discharge channel 16A can be connected to an oil suction and discharge member in the first oil suction and discharge group to form an oil suction and discharge group with an output flow of B, and the oil discharge channel 16A can be connected to an oil suction and discharge member in the first oil suction and discharge group to form an oil suction and discharge group with an output flow of 2B, thereby realizing the adjustment of the flow accuracy.

[0097] Furthermore, by combining the different cross-sections of the accommodating chambers 143 of the oil suction and discharge members in at least two of the oil suction and discharge units, oil suction and discharge groups with more output flow rates can be formed.

[0098] For example, the plurality of oil suction and discharge units include a first oil suction and discharge unit corresponding to the first eccentric wheel, a second oil suction and discharge unit corresponding to the second eccentric wheel, and a third oil suction and discharge unit corresponding to the third eccentric wheel. The first oil suction and discharge unit includes a first oil suction and discharge group and a second oil suction and discharge group. The ratio of the cross-section of the accommodating cavity 143 of the oil suction and discharge member in the first oil suction and discharge group to the cross-section of the accommodating cavity 143 of the oil suction and discharge member in the second oil suction and discharge group is 0.5. The ratio of the cross-section of the accommodating cavity 143 of the oil suction and discharge member in the second oil suction and discharge group to the cross-section of the accommodating cavity 143 of the oil suction and discharge member in the second oil suction and discharge unit is 0.5. The cross-section of the accommodating cavity 143 of the oil suction and discharge member in the second oil suction and discharge unit is equal to the cross-section of the accommodating cavity 143 of the oil suction and discharge member in the third oil suction and discharge unit. The oil discharge passage 16A can arbitrarily connect at least one oil suction and discharge member.

[0099] In some embodiments of the present application, the eccentric distances of at least two eccentric wheels 13 among the eccentric wheels 13 are not equal.

[0100] When the eccentric distances of the eccentric wheels 13 are not equal, the moving strokes of the oil suction and discharge parts in the corresponding oil suction and discharge units are not equal. The output flow of the oil suction and discharge parts with a short moving stroke is naturally small, and the output flow of the oil suction and discharge parts with a shorter moving stroke is naturally large. The oil discharge passage 16A connects different oil suction and discharge parts to form oil suction and discharge groups with different output flow rates. The oil suction and discharge parts with a smaller output flow rate facilitate the hydraulic device to adjust the accuracy of the output flow rate.

[0101] It is understandable that in some embodiments of the present application, the eccentric distances of the eccentric wheels 13 in the corresponding oil suction and discharge units are equal. In this case, the eccentric wheels 13 can be of the same size, and the rotating shaft 12 has good balance.

[0102] In some embodiments of the present application, the oil suction and discharge parts in the oil suction and discharge unit are evenly spaced along the circumference of the rotating shaft 12, and the multiple 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, α = 180°-360° / the number of all oil suction and discharge parts in the two oil suction and discharge units.

[0103] At this time, the setting of the angle between the eccentric direction of the first eccentric wheel and the eccentric direction of the second eccentric wheel only considers the continuity of the output flow. When the first eccentric wheel is separated from the oil suction and discharge part in the corresponding oil suction and discharge unit, the second eccentric wheel is in contact with the oil suction and discharge part in the corresponding oil suction and discharge unit. When the second eccentric wheel is separated from the oil suction and discharge part in the corresponding oil suction and discharge unit, the first eccentric wheel is in contact with the oil suction and discharge part in the corresponding oil suction and discharge unit, so that the output flow of the hydraulic device has good continuity.

[0104] For example, when the number of oil suction and discharge parts in each oil suction and discharge unit is 6, α=180°-360° / 12=150°; when the number of oil suction and discharge parts in each oil suction and discharge unit is 8, α=180°-360° / 16=157.5°; when the number of oil suction and discharge parts in each oil suction and discharge unit is 3, α=180°-360° / 6=120°.

[0105] In some embodiments of the present application, the multiple eccentric wheels 13 further include a third eccentric wheel, and 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.

[0106] In combination with the above-mentioned situation that only the continuity of the output flow of the hydraulic device is considered when the angle between the first eccentric wheel and the second eccentric wheel is α, the third eccentric wheel is located in the direction of the resultant force of the reaction force of the first eccentric wheel and the reaction force of the second eccentric wheel, so that the third eccentric wheel balances the resultant force of the reaction force of the first eccentric wheel and the reaction force of the second eccentric wheel, so that the rotating shaft 12 has better dynamic balance.

[0107] In some embodiments of the present application, each oil suction and discharge unit includes 6 oil suction and discharge parts 40, 150°≤α≤180°, for example, 155°, 160°, 165°, 170° or 175°.

[0108] Combined with the above α=180°-360° / the number of all oil suction and discharge parts in two oil suction and discharge units, when there are 6 oil suction and discharge parts in each oil suction and discharge unit, the rotating shaft 12 has good dynamic balance and the output flow of the hydraulic device also has good continuity.

[0109] In some embodiments of the present application, the oil suction and discharge member has an accommodating cavity 143 , and when the cross-sectional areas of the accommodating cavities 143 of all the oil suction and discharge members are equal, the multiple eccentric wheels 13 are evenly spaced along the circumference of the rotating shaft 12 .

[0110] It is understood that the shaft 12 achieves maximum balance when the eccentric directions of the multiple eccentrics 13 are arranged at equal angles along the circumference of the shaft 12. In this case, the reaction forces applied by the oil suction and discharge units to the corresponding eccentrics 13 can completely offset each other. The eccentric direction of the eccentric 13 is the direction in which the axis of the eccentric 13 and the axis of the shaft 12 are aligned.

[0111] For example, when there are two eccentric wheels 13 , each eccentric wheel 13 contacts the oil suction and discharge component in the corresponding oil suction and discharge unit, and the eccentric direction of each eccentric wheel 13 forms an angle of 180°. Then, the resultant force acting on the rotating shaft 12 is 0.

[0112] For another example, when there are three eccentric wheels 13, each eccentric wheel 13 contacts the oil suction and discharge component in the corresponding oil suction and discharge unit. At this time, the eccentric direction of each eccentric wheel 13 forms an angle of 120°, and then the resultant force acting on the rotating shaft 12 is 0.

[0113] Please refer to Figure 6 as well as Figure 7 As shown, in some embodiments of the present application, the oil suction and discharge member includes a plunger member 141 and a sliding shoe 142, the sliding shoe 142 and the plunger member 141 are slidingly connected, the plunger member 141 is spherically hinged to the housing 11, and the sliding shoe 142 and the plunger member 141 are surrounded by a receiving chamber 143 for absorbing the hydraulic medium; the oil suction and discharge unit also includes a return ring 19, which connects the sliding shoes 142 of all the oil suction and discharge members in the oil suction and discharge unit; wherein, when the eccentric wheel 13 rotates around the axis of the rotating shaft 12, the sliding shoe 142 can move relative to the plunger member 141 along the radial direction of the rotating shaft 12.

[0114] The plunger 141 is mounted on the housing 11. The shape and size of the plunger 141 are not limited in the embodiment of the present application. Figure 6As shown, in some embodiments of the present application, the plunger 141 has a receiving cavity 143 to ensure the structural strength of the sliding shoe 142 , and the sliding shoe 142 is slidably inserted into the receiving cavity 143 to ensure the structural strength of the sliding shoe 142 .

[0115] The slipper 142 is used to cooperate with the eccentric wheel 13. When the eccentric wheel 13 drives the plunger 141, the eccentric wheel 13 contacts the slipper 142 to move the slipper 142 away from the rotating shaft 12 along the radial direction of the rotating shaft 12. In some embodiments of the present application, the slipper 142 includes a connecting portion and a matching portion. The connecting portion and the plunger 141 are slidingly connected. The matching portion has a contact surface that slides with the eccentric wheel 13, and the contact surface is set to an arc surface corresponding to the eccentric wheel 13.

[0116] The sliding shoe 142 in the embodiment of the present application can be made of wear-resistant material, such as wear-resistant metal or wear-resistant alloy; or, the surface of the sliding shoe 142 has a wear-resistant layer, for example, the surface of the sliding shoe 142 has a wear-resistant coating or is electroplated with wear-resistant metal.

[0117] The return ring 19 is used to restore the sliding shoe 142 to its original position. For example, the same oil suction and discharge unit includes a first oil suction and discharge member 14A, a second oil suction and discharge member 14B, a third oil suction and discharge member, and a fourth oil suction and discharge member arranged at equal intervals along the rotating shaft 12. After the eccentric wheel 13 drives the sliding shoe 142 of the first oil suction and discharge member 14A away from the rotating shaft 12 in the radial direction of the rotating shaft 12, the eccentric wheel 13 rotates to the second oil suction and discharge member 14B to drive the sliding shoe 142 of the second oil suction and discharge member 14B to rotate along the rotating shaft 12. When the eccentric wheel 13 rotates to the third oil suction and discharge member, since the third oil suction and discharge member and the first oil suction and discharge member 14A are arranged opposite to each other, the eccentric wheel 13 drives the sliding shoe 142 of the third oil suction and discharge member to move away from the rotating shaft 12 in the radial direction of the rotating shaft 12, and then the sliding shoe 142 of the first oil suction and discharge member 14A returns to its original position.

[0118] The number of return rings 19 corresponding to the same oil suction and discharge unit can be multiple. Multiple return rings 19 can improve the reliability of the hydraulic device. Even if one of the multiple return rings 19 is damaged, the remaining return rings 19 can still ensure that the eccentric wheel 13 can return the oil suction and discharge parts in the corresponding oil suction and discharge unit.

[0119] Please refer to Figure 7 As shown, the number of return rings 19 corresponding to the same oil suction and discharge unit is two, and the two return rings 19 are arranged along the axial direction of the rotating shaft 12. Therefore, the number of return rings 19 corresponding to n oil suction and discharge units is n.

[0120] When the eccentric wheel 13 rotates around the axis of the rotating shaft 12, it pushes the slipper 142 to move away from the rotating shaft 12 in the radial direction of the rotating shaft 12. When the eccentric wheel 13 rotates to the slipper 142 of the next oil suction and discharge component, it can drive the slipper 142 of the remaining oil suction and discharge components to move in the radial direction of the rotating shaft 12 through the return ring 19. When the eccentric wheel 13 rotates a certain angle, the slipper 142 can be restored to its original position (in this process, the plunger 141 can rotate in the cavity relative to the housing 11), that is, all the oil suction and discharge components in the same oil suction and discharge unit can be reset through the return ring 19, which simplifies the structure of the hydraulic device and improves the reliability of the hydraulic device.

[0121] It can be understood that in some embodiments of the present application, an elastic member may be arranged between the plunger member 141 and the sliding shoe 142. When the eccentric wheel 13 drives the sliding shoe 142 to move radially away from the rotating shaft 12 relative to the plunger member 141, the elastic member is gradually compressed. After the eccentric wheel 13 and the sliding shoe 142 are separated, the elastic member has elastic potential energy, which causes the sliding shoe 142 to move radially toward the rotating shaft 12 to return to its original position.

[0122] Please refer to Figure 7 As shown, in some embodiments of the present application, the oil suction and discharge unit further includes a limiting member 20, and the limiting member 20 and the sliding shoe 142 are surrounded by a limiting groove 201, the limiting member 20 and the sliding shoe 142 are fixedly connected, and the return ring 19 is partially located in the limiting groove 201.

[0123] The limiting member 20 is used to cooperate with the sliding shoe 142 to fix the return ring 19 to achieve a fixed connection between the return ring 19 and the sliding shoe 142. In the embodiment of the present application, there is no limitation on the material, shape, etc. of the limiting member 20, as long as the limiting member 20 can surround the sliding shoe 142 to form a limiting groove 201 to limit the return ring 19.

[0124] In combination with the above-mentioned same oil suction and discharge unit, the number of return rings 19 corresponding to them is two. Accordingly, in some embodiments of the present application, the limiting member 20 and the sliding shoe 142 are surrounded by two limiting grooves 201 , and the two limiting grooves 201 are arranged along the axial direction of the rotating shaft 12 .

[0125] In some other embodiments of the present application, the limiting groove 201 may be provided on the limiting member 20 to ensure the structural strength of the sliding shoe 142 .

[0126] In some other embodiments of the present application, the limiting groove 201 can also be provided on the sliding shoe 142, so that the limiting member 20 has a higher structural strength. The limiting groove 201 is located on the sliding shoe 142, and the cross-sectional shape of the limiting groove 201 can be an arc groove (see Figure 8 As shown), it can also be a V-shaped groove, and the inner wall of the return ring 19 should also be set to the shape of the limiting groove 201.

[0127] The limiting groove 201 in the embodiment of the present application can also be partially 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 are surrounded to form the limiting groove 201. The limiting member 20 and the sliding shoe 142 have sufficient structural strength.

[0128] In some embodiments of the present application, the thickness of the return ring 19 is smaller than the depth of the limiting groove 201 , so that the sliding shoe 142 and the limiting member 20 can clamp the return ring 19 after being connected, thereby fixing the return ring 19 .

[0129] It can be understood that the hydraulic device of the present application also includes a controller, which is electrically connected to the second control valve 17A, the third control valve 17B, the first control valve 15B and the fourth control valve 15C. The controller can send control instructions to the second control valve 17A, the third control valve 17B, the first control valve 15B and the fourth control valve 15C to control the on and off of the second control valve 17A, the third control valve 17B, the first control valve 15B and the fourth control valve 15C.

[0130] The second control valve 17A and the third control valve 17B may be electromagnetic relief valves, and the first control valve 15B and the fourth control valve 15C may be electromagnetic on-off valves or high-speed on-off valves.

[0131] The first control valve 15B and the fourth control valve 15C may be one-way valves, and the second control valve 17A and the third control valve 17B may be electromagnetic on-off valves or high-speed on-off valves.

[0132] After the first control valve 15B, the second control valve 17A, the third control valve 17B and the fourth control valve 15C use electromagnetic switch valves, the current or voltage required for the switch valves can be greatly reduced, thereby reducing power consumption; the control frequency of the electromagnetic switch valves is greatly reduced, thereby greatly reducing the control difficulty of the controller.

[0133] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A hydraulic device, characterized in that: include: a housing, the housing having a cavity connected to an external oil source; a rotating shaft, the rotating shaft being located in the cavity and rotatably connected to the housing about its own axis; A plurality of eccentric wheels, each of which is fixed on the rotating shaft and arranged along the axial direction of the rotating shaft, wherein the axis of the eccentric wheel is parallel to the axis of the rotating shaft, and the plurality of eccentric wheels are arranged at an angle along the circumference of the rotating shaft; A plurality of oil suction and discharge units, each of the plurality of oil suction and discharge units corresponding to the plurality of eccentric wheels is mounted on the housing; the oil suction and discharge units include at least one group of the oil suction and discharge groups, each of the oil suction and discharge groups includes at least two oil suction and discharge parts; the plurality of oil suction and discharge parts include at least one first oil suction and discharge part and at least one second oil suction and discharge part; The first oil suction and discharge member is connected to a first one-way valve. For the oil suction and discharge group including at least one first oil suction and discharge member, the first one-way valves corresponding to all the first oil suction and discharge members in the oil suction and discharge group are connected to a second control valve and a fourth control valve. The fourth control valve is connected in parallel with the second control valve. The second control valve is used to connect to the cavity or an external oil source. The second oil suction and discharge member is connected to a first control valve and a third control valve, the first control valve and the third control valve are connected in parallel, and the third control valve is used to connect to the cavity or an external oil source; When the rotating shaft rotates around its own axis, each eccentric wheel drives the oil suction and discharge component in the corresponding oil suction and discharge unit to work.

2. The hydraulic device according to claim 1, characterized in that In the case where there are multiple first oil suction and discharge components in the same oil suction and discharge group, the hydraulic device further includes: The oil discharge passage 1 is connected to the first one-way valves corresponding to the plurality of the first oil suction and discharge components, and the corresponding second control valves and the corresponding fourth control valves.

3. The hydraulic device according to claim 2, characterized in that: The oil drain passage 1 is arranged in the housing, the oil drain passage 1 is arranged around the circumference of the rotating shaft, and a plurality of oil drain passages 1 are distributed along the axial direction of the rotating shaft.

4. The hydraulic device according to claim 1, characterized in that It also includes an oil discharge passage 2, which is connected to multiple first control valves corresponding to multiple second oil suction and discharge parts in the same oil suction and discharge group; or, it is connected to at least one first control valve corresponding to at least one second oil suction and discharge part and at least one fourth control valve corresponding to at least one first oil suction and discharge part in the same oil suction and discharge group.

5. The hydraulic device according to claim 1, characterized in that: A second one-way valve is provided between the intersection of the first control valve and the third control valve in parallel and the second oil suction and discharge member.

6. The hydraulic device according to claim 1, characterized in that The number of the oil suction and discharge parts in the multiple oil suction and discharge groups in the same oil suction and discharge unit is equal, and all the oil suction and discharge parts in the multiple oil suction and discharge groups in the same oil suction and discharge unit are staggered along the circumference of the rotating shaft.

7. The hydraulic device according to claim 1, characterized in that The number of the oil suction and discharge parts in the multiple oil suction and discharge groups in different oil suction and discharge units is equal, and the corresponding oil suction and discharge parts in the multiple oil suction and discharge groups in different oil suction and discharge units overlap along the axial direction of the rotating shaft.

8. The hydraulic device according to claim 1, characterized in that: The oil suction and discharge member has an accommodating cavity, and the cross sections of the accommodating cavities of the oil suction and discharge members in at least two groups of the oil suction and discharge units in the plurality of oil suction and discharge units are different.

9. The hydraulic device according to claim 1, characterized in that: The oil suction and discharge member has an accommodating cavity. The oil suction and discharge unit has a plurality of the oil suction and discharge members. The plurality of oil suction and discharge members are divided into a plurality of oil suction and discharge groups. The cross sections of the accommodating cavities of the oil suction and discharge members in at least two of the oil suction and discharge groups are unequal.

10. The hydraulic device according to claim 1, characterized in that The eccentric distances of at least two of the eccentric wheels are unequal.

11. The hydraulic device according to claim 1, characterized in that: The oil suction and discharge parts in the oil suction and discharge unit are evenly spaced along the circumference of the rotating shaft. The 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, α=180°-360° / the number of all the oil suction and discharge parts in the two oil suction and discharge units.

12. The hydraulic device according to claim 11, characterized in that The multiple eccentric wheels further include a third eccentric wheel, and 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.

13. The hydraulic device according to claim 11, characterized in that Each group of the oil suction and discharge units includes 6 oil suction and discharge parts, and 150°≤α≤180°.

14. The hydraulic device according to any one of claims 1 to 13, characterized in that: The oil suction and discharge member comprises: a plunger, the plunger being spherically hinged to the housing; and A sliding shoe, wherein the sliding shoe and the plunger are slidably connected, and the sliding shoe and the plunger are surrounded by an accommodating cavity for absorbing a hydraulic medium; The oil suction and discharge unit further comprises: a return ring, the return ring connecting the sliding shoes of all the oil suction and discharge parts in the oil suction and discharge unit; When the eccentric wheel rotates around the axis of the rotating shaft, the sliding shoe can move relative to the plunger along the radial direction of the rotating shaft, and the return ring can drive the remaining sliding shoes in the oil suction and discharge unit to move relative to the corresponding plunger.

15. The hydraulic device according to claim 14, characterized in that The sliding shoe includes a connecting portion and a matching portion that are connected to each other. The connecting portion and the plunger are connected in a radial sliding manner along the rotating shaft and are surrounded by the accommodating cavity. The matching portion has a contact surface that matches the eccentric wheel, and the return ring and the matching portion are connected away from the side of the rotating shaft.

16. The hydraulic device according to claim 15, characterized in that The oil suction and discharge unit further comprises: A limiting member, wherein the limiting member and the matching portion are surrounded by a limiting groove, the limiting member and the matching portion are fixedly connected, and the return ring portion is located in the limiting groove.

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