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 hydraulic device comprises a shell, a rotating shaft, a plurality of eccentric wheels, a plurality of oil suction and discharge units, a plurality of first control valves and a plurality of second control valves. The shell is provided with a cavity. 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 axial direction of the rotating shaft, the axes of the eccentric wheels are parallel to the axis of the rotating shaft, and the eccentric wheels are arranged in the circumferential direction of the rotating shaft at included angles. 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 at least two oil suction and discharge sets, each oil suction and discharge set comprises at least two oil suction and discharge parts, and the oil suction and discharge parts are connected with first one-way valves. The first control valve is communicated with a first one-way valve of one oil suction and discharge group and is communicated with the cavity; the second control valve is communicated with the first one-way valve of one oil suction and discharge set and connected with the corresponding first 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] The present invention provides a hydraulic device, aiming to solve the problem of how to improve the balance of the 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, a plurality of oil suction and discharge units, a plurality of first control valves and a plurality of second control valves. The housing has a cavity, which is 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 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; the plurality of oil suction and discharge units correspond one to one to the plurality of The eccentric wheel is installed on the housing; the oil suction and discharge unit includes at least two groups of the oil suction and discharge groups, and the oil suction and discharge groups include at least two oil suction and discharge parts, and the oil suction and discharge parts are connected to a first one-way valve; the first control valve is connected to the first one-way valve of a group of the oil suction and discharge groups, and the first control valve is connected to the cavity or the external oil source; the second control valve is connected to the first one-way valve of a group of the oil suction and discharge groups, and is connected in parallel with the corresponding first control valve; wherein, when the rotating shaft rotates around its own axis, each eccentric wheel drives the oil suction and discharge parts in the corresponding oil suction and discharge unit to work.

[0006] In the hydraulic device provided by the embodiments of the present application, a rotating shaft drives multiple eccentrics to rotate within a cavity. The eccentrics drive the corresponding oil suction and discharge components within the suction and discharge units to operate. A first one-way valve in each of the suction and discharge components simultaneously connects to a first control valve and a second control valve. When the first control valve is on, hydraulic medium flows back into the cavity through the first control valve. When the first control valve is off, the hydraulic medium enters the external actuator through the second control valve. Because the first control valves correspond to the suction and discharge groups, the opening or closing of multiple first control valves can control whether different suction and discharge groups discharge oil. This allows the output flow rates of the multiple suction and discharge groups to be adjusted in a stepwise manner. The minimum adjustable flow rate is the output flow rate of one suction and discharge group, and the maximum adjustable flow rate is the output flow rate of all suction and discharge groups. A single suction and discharge group can supply oil to a single actuator, while multiple suction and discharge groups can supply oil to a single actuator and achieve stepwise flow adjustment or supply oil to multiple actuators separately. Therefore, the hydraulic device can supply oil to multiple actuators.

[0007] In addition, when the rotating shaft rotates in the embodiment of the present application, each eccentric wheel will be subjected to the reaction force of the oil suction and discharge parts. Since the oil suction and discharge unit in the embodiment of the present application includes at least two oil suction and discharge groups, and each oil suction and discharge group includes at least two oil suction and discharge parts, when the rotating shaft rotates, the reaction forces of the oil suction and discharge parts on each eccentric wheel will at least partially offset each other, and the rotating shaft has better balance.

[0008] In some embodiments of the present application, the number of oil suction and discharge components in each oil suction and discharge group in the same oil suction and discharge unit is equal, and all the oil suction and discharge components 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.

[0009] Based on the above embodiment, when the corresponding eccentric wheel rotates around the axis of the rotating shaft, it sequentially drives the oil suction and discharge components in the multiple oil suction and discharge groups, so that the oil suction and discharge units can evenly output the hydraulic medium.

[0010] 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.

[0011] In some embodiments of the present application, the housing further has a plurality of oil drain passages, the oil drain passages being arranged corresponding to the second control valve, the oil drain passages being connected to the first one-way valve in the same oil suction and discharge group, and the oil drain passages being also connected to the corresponding second control valve and the corresponding first control valve.

[0012] Based on the above embodiment, the oil drain passage enables communication between a second control valve and at least one check valve within the same suction and discharge group, and also enables communication between a first control valve and at least one check valve within the same suction and discharge group. Furthermore, since the oil drain passage is formed within the housing, the outer surface of the housing is only used for arranging the suction and discharge components, simplifying the external structure of the hydraulic device.

[0013] In some embodiments of the present application, the oil drainage passage is arranged around the circumference of the rotating shaft, and multiple oil drainage passages are distributed along the axial direction of the rotating shaft. Two oil drainage passages that overlap in the axial direction of the rotating shaft overlap along the circumferential portion 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 number of the oil suction and discharge groups in different oil suction and discharge units is the same, and the corresponding oil suction and discharge members in the multiple oil suction and discharge groups in different oil suction and discharge units overlap along the axial direction of the rotating shaft.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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-sectional areas 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.

[0020] 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.

[0021] In some embodiments of the present application, the eccentric distances of at least two of the eccentric wheels are not equal.

[0022] 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.

[0023] 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 along the axial direction of the rotating shaft, the oil suction and discharge parts in the oil suction and discharge unit overlap with any oil suction and discharge parts in another oil suction and discharge unit. The multiple eccentric wheels include a first eccentric wheel and a second eccentric wheel, and 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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°.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Beneficial effects of the present invention:

[0036] 1. A rotating shaft drives multiple eccentrics to rotate within a cavity. The eccentrics drive the corresponding suction and discharge components within the suction and discharge units. The first check valve of each suction and discharge component is connected to both a first control valve and a second control valve. When the first control valve is on, the hydraulic medium flows back into the cavity through the first control valve. When the first control valve is off, the hydraulic medium flows through the second control valve to the external actuator. Because the first control valves correspond to each suction and discharge group, the opening or closing of multiple first control valves can control the discharge of different suction and discharge groups. This allows for step-by-step adjustment of the output flow of multiple suction and discharge groups. The minimum adjustable flow rate is the output flow of one suction and discharge group, and the maximum adjustable flow rate is the output flow of all suction and discharge groups. A single suction and discharge group can supply oil to a single actuator, while multiple suction and discharge groups can supply oil to a single actuator or to multiple actuators separately. Therefore, this hydraulic device can supply oil to multiple actuators.

[0037] By arranging multiple oil suction and discharge groups in multiple oil suction and discharge units, 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 the single group or multiple groups or multiple units of oil suction and discharge groups are in oil discharge operation.

[0038] 2. When the cross-sectional areas of the accommodating cavities 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 cavity is naturally smaller, and the output flow rate of the oil suction and discharge part with a larger cross-sectional area of ​​the accommodating cavity 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 cavity facilitate the accuracy of adjusting the output flow rate by the hydraulic device.

[0039] 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. 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 make it easier for the hydraulic device to adjust the output flow rate accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0041] Figure 2 This is a schematic diagram of the structure after the rotating shaft and the eccentric wheel are connected in some embodiments of the present 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 without the housing.

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

[0045] Figure 6 Schematic diagram of the structure of the hydraulic device in other embodiments of the present application.

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

[0047] Figure 8 This is a schematic structural diagram of the eccentric wheel driving the oil suction and discharge parts in some embodiments of the present application.

[0048] Figure 9 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.

[0049] Figure 10 This is a schematic diagram of the partial structure of the sliding shoe and the return ring in some embodiments of the present application.

[0050] Reference numerals:

[0051] 11. Housing; 12. Rotating shaft; 13. Eccentric wheel; 131. Oil suction groove; 14. Oil suction and discharge member; 141. Plunger member; 142. Sliding shoe; 143. Accommodating chamber; 15. First one-way valve; 16. Oil discharge passage; 17. First control valve; 18. Second control valve; 19. Return ring; 20. Limit member; 201. Limit groove. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] Please refer to Figures 1 to 5 As shown, in the first aspect, the embodiment of the present application provides a hydraulic device, which includes a housing 11, a rotating shaft 12, a plurality of eccentric wheels 13, a plurality of oil suction and discharge units, a plurality of first control valves 17 and a plurality of second control valves 18. 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 all fixed on the rotating shaft 12 and arranged along the axial direction of the rotating shaft 12, the axis of the eccentric wheel 13 is 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 correspond one to one to the plurality of An eccentric wheel 13 is installed on the housing 11; the oil suction and discharge unit includes at least two oil suction and discharge groups, and the oil suction and discharge group includes at least two oil suction and discharge parts 14, and the oil suction and discharge part 14 is connected to a first one-way valve 15; the first control valve 17 is connected to the first one-way valve 15 of one oil suction and discharge group, and the first control valve 17 is connected to the cavity or an external oil source; the second control valve 18 is connected to the first one-way valve 15 of one oil suction and discharge group, and is connected in parallel with the corresponding first control valve 17, 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 oil suction and discharge part 14 in the corresponding oil suction and discharge unit to work.

[0055] In the embodiment of the present application, 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, one at each end of the rotating shaft 12.

[0056] It can be understood that the hydraulic device in the embodiment of the present application has multiple second control valves 18, that is, the hydraulic device of the present application can be connected to multiple external actuators, that is, the hydraulic device can drive multiple external actuators at the same time.

[0057] The rotating shaft 12 is used to drive the eccentric wheel 13 to rotate. Figure 1 and 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.

[0058] In the hydraulic device provided in the embodiments of the present application, a rotating shaft 12 drives multiple eccentrics 13 to rotate within a cavity. The eccentrics 13 drive the corresponding oil suction and discharge components 14 within the suction and discharge units. The first check valve 15 of each suction and discharge component 14 is connected to both a first control valve 17 and a second control valve 18. When the first control valve 17 is on, the hydraulic medium flows back into the cavity through the first control valve 17. When the first control valve 17 is off, the hydraulic medium flows through the second control valve 18 to the external actuator. Because the first control valves 17 correspond to each suction and discharge group, the opening and closing of multiple first control valves 17 can control the discharge of different suction and discharge groups. This allows the output flow of multiple suction and discharge groups to be adjusted in a stepwise manner, with the minimum adjustable flow rate being the output flow rate of a single suction and discharge group and the maximum adjustable flow rate being the output flow rate of all suction and discharge groups. One or more suction and discharge groups can independently supply oil to a single actuator, thus enabling the hydraulic device to supply oil to multiple actuators.

[0059] In the embodiment of the present application, when the rotating shaft 12 rotates, each eccentric wheel 13 will be subjected to the reaction force of the oil suction and discharge member 14. Since the oil suction and discharge unit of the embodiment of the present application includes at least two oil suction and discharge groups, and each oil suction and discharge group includes at least two oil suction and discharge members 14, when the rotating shaft 12 rotates, the reaction forces of the oil suction and discharge members 14 on each eccentric wheel 13 will at least partially offset each other, and the rotating shaft 12 has better balance.

[0060] Please refer to Figure 4 as well as Figure 5As shown, in some embodiments of the present application, the number of oil suction and discharge components 14 in each oil suction and discharge group in the same oil suction and discharge unit is equal, and all oil suction and discharge components 14 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.

[0061] 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 parts 14 in the two oil suction and discharge groups, and can continuously supply hydraulic medium to multiple external actuators, so that the hydraulic device can drive multiple actuators at the same time.

[0062] At the same time, the oil suction and discharge members 14 in different oil suction and discharge groups are staggered around the axial direction of the rotating shaft 12. In this way, when a single or multiple oil suction and discharge groups are in oil discharge operation, the radial unbalanced force borne by the rotating shaft 12 can be further significantly reduced, that is, the rotating shaft 12 has better balance.

[0063] Please refer to Figures 3 to 5 As shown, in some embodiments of the present application, the housing 11 also has a plurality of oil drain passages 16, and the oil drain passages 16 are arranged corresponding to the second control valve 18. The oil drain passages 16 are connected to the first one-way valve 15 in the same oil suction and discharge group. The oil drain passages 16 are also connected to the corresponding second control valve 18 and the corresponding first control valve 17.

[0064] The oil discharge passage 16 is formed inside the housing 11 , and the outer surface of the housing 11 is only used to arrange the oil suction and discharge member 14 , which can simplify the external structure of the hydraulic device.

[0065] The oil drain passage 16 is used to connect all the oil suction and discharge components 14 in the same oil suction and discharge group, that is, the second control valve 18 is connected to all the oil suction and discharge components 14 in one oil suction and discharge group through the oil drain passage 16. In the embodiment of the present application, there is no limitation on the shape, length, pipe diameter, etc. of the oil drain passage 16, as long as the oil drain passage 16 can connect multiple oil suction and discharge components 14 in the same group.

[0066] 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 parts, the second oil suction and discharge group includes multiple second oil suction and discharge parts, and there is a second oil suction and discharge part between adjacent first oil suction and discharge parts. The multiple oil discharge passages 16 include a first oil discharge passage and a second oil discharge passage, the first oil discharge passage is connected to multiple first oil suction and discharge parts, and the second oil discharge passage is connected to multiple second oil suction and discharge parts. After the corresponding eccentric wheel 13 drives the first oil suction and discharge part to supply hydraulic medium to the first oil discharge passage, it then drives the second oil suction and discharge part to supply hydraulic medium to the second oil discharge passage, and then drives another first oil suction and discharge part to supply hydraulic medium to the first oil discharge passage. In this cycle, hydraulic medium can be evenly supplied to each oil discharge passage 16.

[0067] For another 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 parts, the second oil suction and discharge group includes multiple second oil suction and discharge parts, and the third oil suction and discharge assembly includes multiple third oil suction and discharge parts. Then, there is a second oil suction and discharge part and a first-third oil suction and discharge part between adjacent first oil suction and discharge parts. Similarly, there is a first oil suction and discharge part and a third oil suction and discharge part between adjacent second oil suction and discharge parts.

[0068] Of course, it is understandable that the multiple oil suction and discharge parts 14 within the multiple oil suction and discharge groups can also be arranged arbitrarily. 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 a plurality of first oil suction and discharge parts, and the second oil suction and discharge group includes a plurality of second oil suction and discharge parts. The plurality of first oil suction and discharge parts and the plurality of second oil suction and discharge parts are arbitrarily arranged along the circumference of the rotating shaft 12.

[0069] It is understandable that when there is only one oil suction and discharge member 14 in an oil suction and discharge group, the oil suction and discharge member 14 can be directly connected to the second control valve 18 without the oil discharge passage 16 .

[0070] When the oil discharge passage 16 is connected to multiple oil suction and discharge components 14 in 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 along the circumferential direction of the rotating shaft 12, that is, the multiple oil suction and discharge components 14 in the same oil suction and discharge unit work sequentially, the hydraulic medium entering the oil discharge passage 16 enters continuously.

[0071] In some embodiments of the present application, the oil discharge passage 16 is connected to the oil suction and discharge components 14 in different oil suction and discharge units.

[0072] When the oil discharge passage 16 is connected to the oil suction and discharge parts 14 in different oil suction and discharge units, if the connected oil suction and discharge parts 14 work at the same time, the hydraulic medium can be quickly supplied to the oil discharge passage 16 in a short time; if the multiple connected oil suction and discharge parts 14 work in sequence, the hydraulic medium entering the oil discharge passage 16 is continuous.

[0073] Please refer to Figure 3 and Figure 7 shown, or Figure 6 and Figure 7 As shown, in some embodiments of the present application, the oil drain passages 16 are arranged around the circumference of the rotating shaft 12, and multiple oil drain passages 16 are distributed along the axial direction of the rotating shaft 12. Two oil drain passages 16 that overlap in the axial direction of the rotating shaft 12 partially overlap at two locations along the circumference of the rotating shaft 12. Specifically, in some embodiments of the present application, along the circumference of the rotating shaft 12, two oil drain passages 16 that overlap in the axial direction of the rotating shaft 12 have two ends of one oil drain passage 16 that overlap with two ends of the other oil drain passage 16.

[0074] In the embodiment of the present application, the shell 11 is formed by casting, and a casting mold is placed at the oil drain passage 16 when the shell 11 is cast. The two oil drain passages 16 of the shell 11 overlap in the axial direction of the rotating shaft 12 during the casting process. The less the overlapping parts along the circumferential direction of the rotating shaft 12, the less the overlapping parts of the casting mold along the circumferential direction of the rotating shaft 12. The molten metal fluid in the casting process can more easily flow through the gap between the overlapping parts of the casting mold along the circumferential direction of the rotating shaft 12. In this way, the shell 11 casting has fewer defects and the structural strength of the shell 11 is higher.

[0075] 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 plurality of oil discharge passages 16 include 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 the oil suction and discharge parts 14 in the first oil suction and discharge group, the second oil discharge passage connects all the oil suction and discharge parts 14 in the second oil suction and discharge group, the third oil discharge passage connects all the oil suction and discharge parts 14 in the third oil suction and discharge group, and the fourth oil discharge passage connects all the oil suction and discharge parts 14 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.

[0076] 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 the multiple oil discharge passages 16 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 is connected to all the oil suction and discharge parts 14 in the first oil suction and discharge group, the second oil discharge passage is connected to all the oil suction and discharge parts 14 in the second oil suction and discharge group, the third oil discharge passage is connected to all the oil suction and discharge parts 14 in the third oil suction and discharge group, the fourth oil discharge passage is connected to all the oil suction and discharge parts 14 in the fourth oil suction and discharge group, the fifth oil discharge passage is connected to all the oil suction and discharge parts 14 in the fifth oil suction and discharge group, and the sixth oil discharge passage is connected to all the oil suction and discharge parts 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 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.

[0077] In some embodiments of the present application, multiple eccentric wheels 13 are arranged at equal intervals 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 corresponding oil suction and discharge parts 14 in the multiple oil suction and discharge groups in different oil suction and discharge units overlap along the axial direction of the rotating shaft 12.

[0078] For example, there are two eccentric wheels 13, and the two eccentric wheels 13 include a first eccentric wheel 13 and a second eccentric wheel 13. The force applied to the first eccentric wheel 13 by the oil suction and discharge component 14 corresponding to the first eccentric wheel 13 and the force applied to the second eccentric wheel 13 by the oil suction and discharge component 14 corresponding to the second eccentric wheel 13 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 14 cancel each other out, and the rotating shaft 12 is completely balanced.

[0079] In some embodiments of the present application, the eccentric wheel 13 can simultaneously drive a plurality of adjacent oil suction and discharge members 14 in the corresponding oil suction and discharge unit.

[0080] When the adjacent multiple oil suction and discharge components 14 belong to the same oil suction and discharge group, the oil suction and discharge group can quickly output the hydraulic medium; when the adjacent multiple oil suction and discharge components 14 belong to two oil suction and discharge groups respectively, the eccentric wheel 13 can supply oil to the multiple oil suction and discharge groups at the same time.

[0081] When the above-mentioned oil suction and discharge unit includes multiple oil suction and discharge groups, the oil suction and discharge members 14 in the multiple oil suction and discharge groups are arranged in a staggered manner. At this time, the eccentric wheel 13 can simultaneously supply hydraulic medium to multiple oil discharge channels 16 in the same oil suction and discharge unit during the rotation process around the axis of the rotating shaft 12.

[0082] 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 parts, the second oil suction and discharge group includes multiple second oil suction and discharge parts, and there is a second oil suction and discharge part between adjacent first oil suction and discharge parts so that the oil suction and discharge parts 14 in the multiple oil suction and discharge groups are staggered, and the multiple oil discharge passages 16 include a first oil discharge passage and a second oil discharge passage. The first oil discharge passage connects the multiple first oil suction and discharge parts, and the second oil discharge passage connects the multiple second oil suction and discharge parts. At this time, the corresponding eccentric wheel 13 can simultaneously drive the adjacent first oil suction and discharge parts and the second oil suction and discharge parts to work during the rotation process, so as to simultaneously supply hydraulic medium to the first oil discharge passage and the second oil discharge passage.

[0083] In some embodiments of the present application, the oil suction and discharge member 14 has an accommodating cavity 143 , and the cross-sections of the accommodating cavities 143 of the oil suction and discharge members 14 in at least two groups of oil suction and discharge units in the plurality of oil suction and discharge units are different.

[0084] When the cross-sectional areas of the accommodating cavities 143 of the oil suction and discharge components 14 in multiple oil suction and discharge units are not equal, the output flow rate of the oil suction and discharge component 14 with a smaller cross-sectional area of ​​the accommodating cavity 143 is naturally smaller, and the output flow rate of the oil suction and discharge component 14 with a larger cross-sectional area of ​​the accommodating cavity 143 is naturally larger. The oil discharge passage 16 connects the oil suction and discharge components 14 with different cross-sectional areas to form oil suction and discharge groups with different output flow rates. The oil suction and discharge component 14 with a smaller cross-sectional area of ​​the accommodating cavity 143 facilitates the hydraulic device to adjust the accuracy of the output flow rate.

[0085] For example, the multiple 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 14 in the first oil suction and discharge unit to the cross-section of the accommodating cavity 143 of the oil suction and discharge member 14 in the second oil suction and discharge unit is 0.5. Assuming that the output flow rate of the oil suction and discharge member 14 in one stroke of the first oil suction and discharge unit is A, at this time, the oil discharge channel 16 can connect an oil suction and discharge member 14 in the first oil suction and discharge unit and an oil suction and discharge member 14 in the second oil suction and discharge unit to form an oil suction and discharge group with an output flow rate of 1.5A. The oil discharge channel 16 can connect an oil suction and discharge member 14 in the first oil suction and discharge unit to form an oil suction and discharge group with an output flow rate of A. The oil discharge channel 16 can connect an oil suction and discharge member 14 in the second oil suction and discharge unit to form an oil suction and discharge group with an output flow rate of 2A, thereby realizing the adjustment of the flow accuracy.

[0086] It is understandable that the cross-sections of the accommodating cavities 143 of the oil suction and discharge members 14 in the plurality of oil suction and discharge units may also be equal.

[0087] In some embodiments of the present application, the oil suction and discharge member 14 has a accommodating cavity 143, and the oil suction and discharge unit has multiple oil suction and discharge members 14. The multiple oil suction and discharge members 14 are divided into multiple oil suction and discharge groups, and the cross-sections of the accommodating cavities 143 of the oil suction and discharge members 14 in at least two oil suction and discharge groups are not equal.

[0088] When the cross-sectional areas of the accommodating chambers 143 of the oil suction and discharge components 14 in multiple oil suction and discharge groups are not equal, the output flow rate of the oil suction and discharge component 14 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 component 14 with a larger cross-sectional area of ​​the accommodating chamber 143 is naturally larger. The oil discharge passage 16 connects the oil suction and discharge components 14 with different cross-sectional areas to form oil suction and discharge groups with different output flow rates. The oil suction and discharge component 14 with a smaller cross-sectional area of ​​the accommodating chamber 143 facilitates the accuracy of adjusting the output flow rate by the hydraulic device.

[0089] 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 14 in the first oil suction and discharge group to the cross-section of the accommodating cavity 143 of the oil suction and discharge member 14 in the second oil suction and discharge group is 0.5. Assuming that the output flow rate of the oil suction and discharge member 14 in one stroke of the first oil suction and discharge group is B, at this time, the oil discharge passage 16 can connect one oil suction and discharge member 14 in the first oil suction and discharge group and one oil suction and discharge member 14 in the second oil suction and discharge group to form an oil suction and discharge group with an output flow rate of 1.5B, the oil discharge passage 16 can connect one oil suction and discharge member 14 in the first oil suction and discharge group to form an oil suction and discharge group with an output flow rate of B, and the oil discharge passage 16 can connect one oil suction and discharge member 14 in the first oil suction and discharge group to form an oil suction and discharge group with an output flow rate of 2B, thereby realizing the adjustment of flow accuracy.

[0090] Furthermore, by combining the different cross-sections of the accommodating chambers 143 of at least two of the oil suction and discharge units, oil suction and discharge groups with more output flow rates can be formed. For example, the multiple 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 14 in the first oil suction and discharge group to the cross-section of the accommodating cavity 143 of the oil suction and discharge member 14 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 14 in the second oil suction and discharge group to the cross-section of the oil suction and discharge member 14 in the second suction and discharge unit is 0.5. The cross-section of the accommodating cavity 143 of the oil suction and discharge member 14 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 14 in the third oil suction and discharge unit. The oil discharge channel 16 can be arbitrarily connected to at least one oil suction and discharge member 14.

[0091] 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.

[0092] When the eccentric distances of the eccentric wheels 13 are not equal, the moving strokes of the oil suction and discharge parts 14 in the corresponding oil suction and discharge units are not equal. The output flow of the oil suction and discharge parts 14 with a shorter moving stroke is naturally smaller, and the output flow of the oil suction and discharge parts 14 with a shorter moving stroke is naturally larger. The oil discharge passage 16 connects different oil suction and discharge parts 14 to form oil suction and discharge groups with different output flow rates. The oil suction and discharge parts 14 with a smaller output flow rate facilitate the hydraulic device to adjust the accuracy of the output flow rate.

[0093] 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.

[0094] In some embodiments of the present application, the oil suction and discharge parts 14 in the oil suction and discharge unit are evenly spaced along the circumference of the rotating shaft 12, and along the axial direction of the rotating shaft 12, the oil suction and discharge parts 14 in the oil suction and discharge unit overlap with any oil suction and discharge part 14 in another oil suction and discharge unit, 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 14 in the two oil suction and discharge units.

[0095] 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 14 in the corresponding oil suction and discharge unit, the second eccentric wheel is in contact with the oil suction and discharge part 14 in the corresponding oil suction and discharge unit. When the second eccentric wheel is separated from the oil suction and discharge part 14 in the corresponding oil suction and discharge unit, the first eccentric wheel is in contact with the oil suction and discharge part 14 in the corresponding oil suction and discharge unit, so that the output flow of the hydraulic device has good continuity.

[0096] For example, when the number of the oil suction and discharge parts 14 in each oil suction and discharge unit is 6, α=180°-360° / 12=150°; when the number of the oil suction and discharge parts 14 in each oil suction and discharge unit is 8, α=180°-360° / 16=157.5°; when the number of the oil suction and discharge parts 14 in each oil suction and discharge unit is 3, α=180°-360° / 6=120°.

[0097] In some embodiments of the present application, the multiple eccentrics 13 further include a third eccentric, and the angle between the eccentric direction of the third eccentric and the eccentric direction of the first eccentric is β, β = 90° + 1 / 2α. In view of the above-mentioned consideration of only the continuity of the output flow of the hydraulic device when the angle α between the first and second eccentrics is considered, the third eccentric is located in the direction of the resultant force of the reaction force of the first eccentric and the reaction force of the second eccentric, so that the third eccentric balances the resultant force of the reaction force of the first eccentric and the reaction force of the second eccentric, thereby achieving better dynamic balance of the rotating shaft 12.

[0098] In some embodiments of the present application, each oil suction and discharge unit includes 6 oil suction and discharge parts 14, 150°≤α≤180°, for example, 155°, 160°, 165°, 170° or 175°.

[0099] Combined with the above α=180°-360° / the number of all oil suction and discharge parts 14 in two oil suction and discharge units, when there are 6 oil suction and discharge parts 14 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.

[0100] Please refer to Figure 8As shown, in some embodiments of the present application, the oil suction and discharge member 14 has an accommodating cavity 143 , and when the cross-sectional areas of the accommodating cavities 143 of all the oil suction and discharge members 14 are equal, the multiple eccentric wheels 13 are evenly spaced along the circumference of the rotating shaft 12 .

[0101] For example, when there are two eccentric wheels 13 , each eccentric wheel 13 contacts the oil suction and discharge member 14 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 on the rotating shaft 12 is 0.

[0102] For another example, when there are three eccentric wheels 13, each eccentric wheel 13 contacts the oil suction and discharge member 14 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 on the rotating shaft 12 is 0.

[0103] Please refer to Figure 8 as well as Figure 9 As shown, in some embodiments of the present application, the oil suction and discharge member 14 includes a plunger member 141 and a sliding shoe 142, the sliding shoe 142 and the plunger member 141 are slidably 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 14 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.

[0104] The plunger 141 is installed on the housing 11. In the embodiments of the present application, there is no limitation on the shape, size, etc. of the plunger 141. 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 in the receiving cavity 143 to ensure the structural strength of the sliding shoe 142.

[0105] 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.

[0106] 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.

[0107] 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, a second oil suction and discharge member, 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 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 to drive the sliding shoe 142 of the second oil suction and discharge member to move away from the rotating shaft 12 in the radial direction of the rotating shaft 12. At this time, the return ring 19 will drive the sliding shoe 142 of the first oil suction and discharge member to move toward the rotating shaft 12 in the radial direction of 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 is arranged opposite to the first oil suction and discharge member, after the eccentric wheel 13 drives the sliding shoe 142 of the third oil suction and discharge member away from the rotating shaft 12 in the radial direction of the rotating shaft 12, the sliding shoe 142 of the first oil suction and discharge member returns to its original position.

[0108] The number of return rings 19 can be multiple, and 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 oil suction and discharge member 14 in the corresponding oil suction and discharge unit. Figure 9 As shown, there are two return rings 19 , which are arranged along the axial direction of the rotating shaft 12 .

[0109] After the sliding shoe 142 moves radially away from the rotating shaft 12 relative to the plunger 141, the oil suction and discharge member 14 draws the hydraulic medium into the accommodating chamber 143. However, the sliding shoe 142 must return to its original position radially relative to the plunger 141 in order for the hydraulic medium in the accommodating chamber 143 to be discharged from the oil suction and discharge member 14 into the oil discharge passage 16. When the sliding shoe 142 moves radially toward the rotating shaft 12, the oil suction and discharge member 14 draws the hydraulic medium into the accommodating chamber 143. When the sliding shoe 142 moves radially away from the rotating shaft 12, the oil suction and discharge member 14 discharges the hydraulic medium in the accommodating chamber 143 into the oil discharge passage 16.

[0110] 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.

[0111] Please refer to Figure 9 As shown, in some embodiments of the present application, the oil suction and discharge unit further includes a limit member 20, and the limit member 20 and the sliding shoe 142 are surrounded by a limit groove 201, the limit member 20 and the sliding shoe 142 are fixedly connected, and the return ring 19 is partially located in the limit groove 201.

[0112] 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.

[0113] In view of the fact that there are two return rings 19 , in some embodiments of the present application, the limiting member 20 and the sliding shoe 142 are provided with two limiting grooves 201 , and the two limiting grooves 201 are arranged along the axial direction of the rotating shaft 12 .

[0114] 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 .

[0115] 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 10 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.

[0116] 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.

[0117] 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 .

[0118] It can be understood that the hydraulic device of the present application also includes a controller, which is electrically connected to the first control valve 17 and the second control valve 18. The controller can send control instructions to the first control valve 17 and the second control valve 18 to control the on and off of the first control valve 17 and the second control valve 18.

[0119] When the first control valve 17 is an electromagnetic relief valve, the second control valve 18 may be an electromagnetic on-off valve or a high-speed on-off valve.

[0120] When the second control valve 18 is a one-way valve, the first control valve 17 may be an electromagnetic on-off valve or a high-speed on-off valve.

[0121] When the first control valve 17 and the second control valve 18 are 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.

[0122] 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 which corresponds to the plurality of eccentric wheels and is mounted on the housing; the oil suction and discharge units include at least two groups of the oil suction and discharge groups, each of which includes at least two oil suction and discharge parts, each of which is connected to a first one-way valve; a plurality of first control valves, wherein the first control valves are connected to a group of first one-way valves of the oil suction and discharge group, and the first control valves are connected to the cavity or an external oil source; and a plurality of second control valves, each of the second control valves being connected to a group of first one-way valves of the oil suction and discharge group and being connected in parallel with the corresponding first control valve; 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 The number of oil suction and discharge components in each oil suction and discharge group in the same oil suction and discharge unit is equal, and the oil suction and discharge components 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.

3. The hydraulic device according to claim 1, characterized in that The housing further has a plurality of oil drain passages, each of which is provided corresponding to the second control valve. The oil drain passages are connected to the first one-way valve in the same oil suction and discharge group. The oil drain passages are 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 oil drainage passages are arranged around the circumference of the rotating shaft, and a plurality of the oil drainage passages are distributed along the axial direction of the rotating shaft. Two oil drainage passages that overlap in the axial direction of the rotating shaft partially overlap along the circumference of the rotating shaft.

5. The hydraulic device according to claim 1, characterized in that: The number of the oil suction and discharge groups in different oil suction and discharge units is the same, and the corresponding oil suction and discharge members in the plurality of oil suction and discharge groups in different oil suction and discharge units overlap along the axial direction of the rotating shaft.

6. 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.

7. 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.

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

9. 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 oil suction and discharge parts in the two oil suction and discharge units.

10. The hydraulic device according to claim 9, 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.

11. The hydraulic device according to claim 9, characterized in that: Each group of the oil suction and discharge units includes 6 oil suction and discharge parts, and 150°≤α≤180°.

12. The hydraulic device according to any one of claims 1 to 11, 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.

13. The hydraulic device according to claim 12, 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 slidably connected along the radial direction of the rotating shaft and are surrounded by the accommodating cavity. The matching portion has a contact surface that matches the eccentric wheel. The contact surface is set as an arc surface corresponding to the eccentric wheel. The return ring and the matching portion are connected away from the side of the rotating shaft.

14. The hydraulic device according to claim 13, 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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