A dual-spool variable flow distribution mechanism for a hydraulic motor

Abstract

The present invention discloses a double-spool variable flow distribution mechanism for a hydraulic motor, which includes a flow distribution plate, a flow distributor, a reversing spool, a rear cover plate, a spring seat, a return spring, a variable spool and a plug. In the double-spool variable flow distribution mechanism for a hydraulic motor of the present invention, when the first main orifice is supplied with oil, the reversing spool is pushed by the hydraulic oil to the right end face of the spool, and the reversing spool also connects the third oil chamber and the fourth oil chamber. At this time, it is in the large displacement state. When the control orifice is supplied with high-pressure oil, the variable spool moves away from the rear cover plate under the action of the control oil and connects the second oil chamber and the third oil chamber. Since the variable spool connects the second oil chamber and the third oil chamber, the second oil chamber, the third oil chamber and the fourth oil chamber are all connected and lead to the return oil at this time. At this time, it is in the small displacement state. When the second main orifice is supplied with oil, there is an opposite circuit. This flow distribution mechanism realizes that the hydraulic motor has no restriction on the preferred rotation direction.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic motors, and specifically relates to a double-spool variable flow distribution mechanism for a hydraulic motor. Background Art

[0002] Currently, the main variable structure of a radial internal curve hydraulic motor is to set a variable spool on the distribution disc seat or to externally connect a variable valve block to the motor to achieve the variable function. And the variable spool set on the distribution disc seat is mostly a variable spool with a preferred rotation direction for the motor. In actual use, the disadvantages of the spool with a preferred rotation direction are obvious. It consumes too much energy, causing energy waste and heat generation. Summary of the Invention

[0003] The purpose of the present invention is to provide a double-spool variable flow distribution mechanism for a hydraulic motor, so that the hydraulic motor has no restriction on the preferred rotation direction, and the problems in the prior art can be solved.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A double-spool variable flow distribution mechanism for a hydraulic motor, including a distribution disc, a distribution body, a reversing spool, a rear cover plate, a spring seat, a return spring, a variable spool, and a plug. The interior of the distribution disc is provided with a distribution body. One side of the distribution disc is provided with a rear cover plate. The interior of the distribution body is provided with a reversing spool. One side of the reversing spool is provided with a plug. Below the distribution body is provided with a variable spool. One end of the variable spool is provided with a spring seat. One side of the spring seat is provided with a return spring;

[0005] The distribution disc includes a first main hole, a second main hole, a control hole passage, an eccentric hole, a spring cavity groove, a first oil cavity, a second oil cavity, a third oil cavity, and a fourth oil cavity. One side of the first main hole is provided with a second main hole. One side of the second main hole is provided with a control hole passage. An eccentric hole is provided inside the distribution disc. One side of the eccentric hole is provided with a spring cavity groove. The spring cavity groove includes a first step and a second step. One side of the first step is provided with a second step. Below the first main hole is provided with a first oil cavity. The interior of the first oil cavity is provided with a first annular oil cavity groove and a first valve hole annular groove. One side of the first oil cavity is provided with a second oil cavity. The interior of the second oil cavity is provided with a second annular oil cavity groove and a second valve hole annular groove. One side of the second oil cavity is provided with a third oil cavity. The interior of the third oil cavity is provided with a third annular oil cavity groove and a third valve hole annular groove. One side of the third oil cavity is provided with a fourth oil cavity. The interior of the fourth oil cavity is provided with a fourth annular oil cavity groove and a fourth valve hole annular groove.

[0006] Preferably, the fluid distributor includes a first distribution pipe, a second distribution pipe, a third distribution pipe, a fourth distribution pipe opening on one end face of the fluid distributor, a first oil hole, a second oil hole, a third oil hole, a fourth oil hole perpendicular to the axis line of the fluid distributor, and a spool hole. The first distribution pipe communicates with the first oil chamber, the second distribution pipe communicates with the second oil chamber, the third distribution pipe communicates with the third oil chamber, the fourth distribution pipe communicates with the fourth oil chamber. The first oil hole communicates with the first oil chamber and the spool hole respectively, the second oil hole communicates with the second oil chamber and the spool hole respectively, the third oil hole communicates with the third oil chamber and the spool hole respectively, and the fourth oil hole communicates with the fourth oil chamber and the spool hole respectively.

[0007] Preferably, the reversing spool includes a first spool oil hole, a second spool oil hole, a third spool oil hole, a fourth spool oil hole perpendicular to the center of the spool, and a fifth spool oil hole and a sixth spool oil hole axially distributed on both end faces of the spool. A second spool oil hole is provided on one side of the first spool oil hole, a third spool oil hole is provided on one side of the second spool oil hole, a fourth spool oil hole is provided on one side of the third spool oil hole. The first spool oil hole, the second spool oil hole communicate with the fifth spool oil hole, and the third spool oil hole, the fourth spool oil hole communicate with the sixth spool oil hole.

[0008] Preferably, the variable spool includes a first groove and a second groove, and the second groove is provided on one side of the first groove.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0010] The dual-spool variable flow distribution mechanism for a hydraulic motor of the present invention. When the first main hole is connected to the inlet oil, the second main hole is connected to the return oil. The first groove connects the first oil chamber and the second oil chamber, and the second groove connects the third oil chamber and the fourth oil chamber. The reversing spool is pushed by the hydraulic oil to the right end face of the spool, and the reversing spool also connects the third oil chamber and the fourth oil chamber. At this time, it is in the large displacement state. When the control passage is connected to high-pressure oil, the variable spool moves away from the rear cover under the action of the control oil to connect the second oil chamber and the third oil chamber, and the first oil chamber and the fourth oil chamber are not connected respectively. At this time, the reversing spool is also at the right end face of the spool, connecting the third oil chamber and the fourth oil chamber. Because the variable spool connects the second oil chamber and the third oil chamber, the second oil chamber, the third oil chamber and the fourth oil chamber are all connected and lead to the return oil at this time. At this time, it is in the small displacement state. When the second main hole is connected to the inlet oil and the first main hole is connected to the return oil, it has an opposite circuit. When in the large displacement, the first oil chamber communicates with the second oil chamber, and the third oil chamber communicates with the fourth oil chamber. At this time, the reversing spool is located on the left side and contacts the plug, and the reversing spool also connects the first oil chamber and the second oil chamber. When in the small displacement, the control passage is connected to high-pressure oil, and the variable spool moves away from the rear cover under the action of the control oil to connect the second oil chamber and the third oil chamber. At this time, the reversing spool is located on the left side and contacts the plug, and the reversing spool makes the first oil chamber, the second oil chamber and the third oil chamber communicate and return oil. This flow distribution mechanism realizes that the hydraulic motor has no restriction on the preferred rotation direction. Brief Description of the Drawings

[0011] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0012] Figure 2 is an enlarged structural view of the present invention;

[0013] Figure 3 is a schematic diagram of the structure of the flow distribution plate of the present invention;

[0014] Figure 4 is a schematic diagram of the structure of the flow distribution body of the present invention;

[0015] Figure 5 is a schematic diagram of the structure of the reversing spool of the present invention.

[0016] In the figure: 1, port plate; 11, first main hole; 12, second main hole; 13, control passage; 14, eccentric hole; 15, spring cavity groove; 15A, first step; 15C, second step; 16, first oil cavity; 161, first annular oil cavity groove; 162, first valve hole annular groove; 17, second oil cavity; 171, second annular oil cavity groove; 172, second valve hole annular groove; 18, third oil cavity; 181, third annular oil cavity groove; 182, third valve hole annular groove; 19, fourth oil cavity; 191, fourth annular oil cavity groove; 192, fourth valve hole annular groove; 2, port body; 21, first distribution pipe; 22, second distribution pipe; 23, third distribution pipe; 24, fourth distribution pipe; 25, first oil hole; 26, second oil hole; 27, third oil hole; 28, fourth oil hole; 29, spool hole; 3, reversing spool; 31, first spool oil hole; 32, second spool oil hole; 33, third spool oil hole; 34, fourth spool oil hole; 35, fifth spool oil hole; 36, sixth spool oil hole; 4, rear cover plate; 5, spring seat; 6, return spring; 7, variable spool; 7A, first groove; 7B, second groove; 8, plug; 9, screw. Detailed implementation manner

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figures 1-3, A double-spool variable flow distribution mechanism for a hydraulic motor, comprising a flow distribution plate 1, a flow distribution body 2, a reversing spool 3, a rear cover plate 4, a spring seat 5, a return spring 6, a variable spool 7, a plug 8 and a screw 9. The inside of the flow distribution plate 1 is provided with the flow distribution body 2, the inside of the flow distribution body 2 is provided with the reversing spool 3, one side of the flow distribution plate 1 is provided with the rear cover plate 4, one side of the spring seat 5 is provided with the return spring 6, the lower part of the flow distribution body 2 is provided with the variable spool 7. The variable spool 7 includes a first groove 7A and a second groove 7B. One side of the first groove 7A is provided with the second groove 7B. One side of the reversing spool 3 is provided with the plug 8. The flow distribution plate 1 includes a first main hole 11, a second main hole 12, a control hole passage 13, an eccentric hole 14, a spring cavity groove 15, a first oil cavity 16, a second oil cavity 17, a third oil cavity 18 and a fourth oil cavity 19. One side of the first main hole 11 is provided with the second main hole 12, one side of the second main hole 12 is provided with the control hole passage 13. The flow distribution plate 1 is provided with the eccentric hole 14 inside, one side of the eccentric hole 14 is provided with the spring cavity groove 15. The spring cavity groove 15 includes a first step 15A and a second step 15C. One side of the first step 15A is provided with the second step 15C. Below the first main hole 11 is provided with the first oil cavity 16. Inside the first oil cavity 16 are provided a first annular oil cavity groove 161 and a first valve hole annular groove 162. One side of the first oil cavity 16 is provided with the second oil cavity 17. Inside the second oil cavity 17 are provided a second annular oil cavity groove 171 and a second valve hole annular groove 172. One side of the second oil cavity 17 is provided with the third oil cavity 18. Inside the third oil cavity 18 are provided a third annular oil cavity groove 181 and a third valve hole annular groove 182. One side of the third oil cavity 18 is provided with the fourth oil cavity 19. Inside the fourth oil cavity 19 are provided a fourth annular oil cavity groove 191 and a fourth valve hole annular groove 192. The first oil cavity 16 communicates with the first valve hole annular groove 162, the second oil cavity 17 communicates with the second valve hole annular groove 172, the third oil cavity 18 communicates with the third valve hole annular groove 182, and the fourth oil cavity 19 communicates with the fourth valve hole annular groove 192. The first groove 7A and the second groove 7B are used to connect or disconnect the first oil cavity 16, the second oil cavity 17, the third oil cavity 18 and the fourth oil cavity 19. In the initial state, the first groove 7A connects the first oil cavity 16 and the second oil cavity 17, and the second groove 7B connects the third oil cavity 18 and the fourth oil cavity 19. While the rotor rotates relative to the housing, the fluid passing through the first main hole 11 or the second main hole 12 will alternately communicate with and discharge from the rotor piston hole through the distribution pipeline.

[0019] Please refer to Figure 4, the fluid distribution body 2 includes a first distribution pipe 21, a second distribution pipe 22, a third distribution pipe 23, a fourth distribution pipe 24 that open on the side surface of the fluid distribution body 2, and a first oil hole 25, a second oil hole 26, a third oil hole 27, a fourth oil hole 28 and a spool hole 29 that are perpendicular to the center line of the fluid distribution body 2. The first distribution pipe 21 communicates with the first oil chamber 16, the second distribution pipe 22 communicates with the second oil chamber 17, the third distribution pipe 23 communicates with the third oil chamber 18, the fourth distribution pipe 24 communicates with the fourth oil chamber 19. The first oil hole 25 communicates with the first oil chamber 16 and the spool hole 29 respectively, the second oil hole 26 communicates with the second oil chamber 17 and the spool hole 29 respectively, the third oil hole 27 communicates with the third oil chamber 18 and the spool hole 29 respectively, and the fourth oil hole 28 communicates with the fourth oil chamber 19 and the spool hole 29 respectively.

[0020] Please refer to Figure 5 , the reversing spool 3 includes a first spool oil hole 31, a second spool oil hole 32, a third spool oil hole 33, a fourth spool oil hole 34, a fifth spool oil hole 35 and a sixth spool oil hole 36. A second spool oil hole 32 is provided on one side of the first spool oil hole 31, a third spool oil hole 33 is provided on one side of the second spool oil hole 32, a fourth spool oil hole 34 is provided on one side of the third spool oil hole 33. The first spool oil hole 31, the second spool oil hole 32 and the fifth spool oil hole 35 communicate with each other, and the third spool oil hole 33, the fourth spool oil hole 34 and the sixth spool oil hole 36 communicate with each other.

[0021] Working principle: When the first main hole 11 admits oil, the second main hole 12 discharges oil. The first groove 7A connects the first oil chamber 16 and the second oil chamber 17, and the second groove 7B connects the third oil chamber 18 and the fourth oil chamber 19. The reversing spool 3 is pushed to the right end face of the spool by hydraulic oil, and the reversing spool 3 also connects the third oil chamber 18 and the fourth oil chamber 19. At this time, it is in the large displacement state. When the control passage 13 admits high-pressure oil, the variable spool 7 moves away from the rear cover plate 4 under the action of the control oil to connect the second oil chamber 17 and the third oil chamber 18, and the first oil chamber 16 and the fourth oil chamber 19 are not connected respectively. At this time, the reversing spool 3 is also at the right end face of the spool, connecting the third oil chamber 18 and the fourth oil chamber 19. Since the variable spool 7 connects the second oil chamber 17 and the third oil chamber 18, the second oil chamber 17, the third oil chamber 18 and the fourth oil chamber 19 are all connected and discharge oil at this time. At this time, it is in the small displacement state. When the second main hole 12 admits oil and the first main hole 11 discharges oil, there is an opposite circuit. When in the large displacement state, the first oil chamber 16 communicates with the second oil chamber 17, and the third oil chamber 18 communicates with the fourth oil chamber 19. At this time, the reversing spool is located on the left side and contacts the plug 8, and the reversing spool also connects the first oil chamber 16 and the second oil chamber 17. When in the small displacement state, the control passage 13 admits high-pressure oil, and the variable spool 7 moves away from the rear cover plate 4 under the action of the control oil to connect the second oil chamber 17 and the third oil chamber 18. At this time, the reversing spool is located on the left side and contacts the plug 8, and the reversing spool makes the first oil chamber 16, the second oil chamber 17 and the third oil chamber 18 communicate and discharge oil.

[0022] To sum up: For the double-spool variable flow distribution mechanism of the hydraulic motor of the present invention, when the first main hole 11 admits oil, the second main hole 12 discharges oil. The first groove 7A connects the first oil chamber 16 and the second oil chamber 17, and the second groove 7B connects the third oil chamber 18 and the fourth oil chamber 19. The reversing spool 3 is pushed to the right end face of the spool by hydraulic oil, and the reversing spool 3 also connects the third oil chamber 18 and the fourth oil chamber 19. At this time, it is in the large displacement state. When the control passage 13 admits high-pressure oil, the variable spool 7 moves away from the rear cover plate 4 under the action of the control oil to connect the second oil chamber 17 and the third oil chamber 18, and the first oil chamber 16 and the fourth oil chamber 19 are not connected respectively. At this time, the reversing spool 3 is also at the right end face of the spool, connecting the third oil chamber 18 and the fourth oil chamber 19. Since the variable spool 7 connects the second oil chamber 17 and the third oil chamber 18, the second oil chamber 17, the third oil chamber 18 and the fourth oil chamber 19 are all connected and discharge oil at this time. At this time, it is in the small displacement state. When the second main hole 12 admits oil and the first main hole 11 discharges oil, there is an opposite circuit. When in the large displacement state, the first oil chamber 16 communicates with the second oil chamber 17, and the third oil chamber 18 communicates with the fourth oil chamber 19. When in the small displacement state, the second main hole 12 connects the fourth oil chamber 19, and the first oil chamber 16, the second oil chamber 17 and the third oil chamber 18 all communicate with the first main hole 11 and discharge oil. This flow distribution mechanism realizes that the hydraulic motor has no restriction on the preferred rotation direction.

[0023] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0024] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dual-spool variable flow distribution mechanism for a hydraulic motor, comprising a flow distribution plate (1), a flow distribution body (2), a reversing spool (3), a rear cover plate (4), a spring seat (5), a return spring (6), a variable spool (7) and a plug (8). It is characterized in that: The flow distribution plate (1) is internally provided with the flow distribution body (2), one side of the flow distribution plate (1) is provided with the rear cover plate (4), the flow distribution body (2) is internally provided with the reversing spool (3), one side of the reversing spool (3) is provided with the plug (8), below the flow distribution body (2) is provided with the variable spool (7), one end of the variable spool (7) is provided with the spring seat (5), and one side of the spring seat (5) is provided with the return spring (6); The flow distribution plate (1) includes a first main hole (11), a second main hole (12), a control hole passage (13), an eccentric hole (14), a spring cavity groove (15), a first oil cavity (16), a second oil cavity (17), a third oil cavity (18) and a fourth oil cavity (19). One side of the first main hole (11) is provided with the second main hole (12), one side of the second main hole (12) is provided with the control hole passage (13), the flow distribution plate (1) is internally provided with the eccentric hole (14), one side of the eccentric hole (14) is provided with the spring cavity groove (15), the spring cavity groove (15) includes a first step (15A) and a second step (15C), one side of the first step (15A) is provided with the second step (15C), below the first main hole (11) is provided with the first oil cavity (16), the first oil cavity (16) is internally provided with a first annular oil cavity groove (161) and a first valve hole annular groove (162), one side of the first oil cavity (16) is provided with the second oil cavity (17), the second oil cavity (17) is internally provided with a second annular oil cavity groove (171) and a second valve hole annular groove (172), one side of the second oil cavity (17) is provided with the third oil cavity (18), the third oil cavity (18) is internally provided with a third annular oil cavity groove (181) and a third valve hole annular groove (182), one side of the third oil cavity (18) is provided with the fourth oil cavity (19), and the fourth oil cavity (19) is internally provided with a fourth annular oil cavity groove (191) and a fourth valve hole annular groove (192); The fluid distributor (2) includes a first distribution pipe (21), a second distribution pipe (22), a third distribution pipe (23), a fourth distribution pipe (24) opening at one end face of the fluid distributor (2), and a first oil hole (25), a second oil hole (26), a third oil hole (27), a fourth oil hole (28) and a spool hole (29) perpendicular to the axis of the fluid distributor. The first distribution pipe (21) communicates with the first oil chamber (16), the second distribution pipe (22) communicates with the second oil chamber (17), the third distribution pipe (23) communicates with the third oil chamber (18), the fourth distribution pipe (24) communicates with the fourth oil chamber (19). The first oil hole (25) communicates with the first oil chamber (16) and the spool hole (29) respectively. The second oil hole (26) communicates with the second oil chamber (17) and the spool hole (29) respectively. The third oil hole (27) communicates with the third oil chamber (18) and the spool hole (29) respectively. The fourth oil hole (28) communicates with the fourth oil chamber (19) and the spool hole (29) respectively; The reversing spool (3) includes a first spool oil hole (31), a second spool oil hole (32), a third spool oil hole (33), a fourth spool oil hole (34) arranged perpendicular to the center of the spool, and a fifth spool oil hole (35) and a sixth spool oil hole (36) arranged axially and distributed on both end faces of the spool. A second spool oil hole (32) is provided on one side of the first spool oil hole (31). A third spool oil hole (33) is provided on one side of the second spool oil hole (32). A fourth spool oil hole (34) is provided on one side of the third spool oil hole (33). The first spool oil hole (31) and the second spool oil hole (32) communicate with the fifth spool oil hole (35). The third spool oil hole (33) and the fourth spool oil hole (34) communicate with the sixth spool oil hole (36); When the first main hole (11) admits oil, the second main hole (12) discharges oil. The first groove (7A) communicates the first oil chamber (16) and the second oil chamber (17). The second groove (7B) communicates the third oil chamber (18) and the fourth oil chamber (19). The reversing spool (3) is pushed by hydraulic oil to the right end face of the spool, and the reversing spool (3) also communicates the third oil chamber (18) and the fourth oil chamber (19). At this time, it is in the large displacement state. When the control passage (13) admits high-pressure oil, the variable spool (7) moves away from the rear cover plate (4) under the action of the control oil to connect the second oil chamber (17) and the third oil chamber (18), and the first oil chamber (16) and the fourth oil chamber (19) are not connected respectively. At this time, the reversing spool (3) is also at the right end face of the spool, communicating the third oil chamber (18) and the fourth oil chamber (19); Because the variable spool (7) connects the second oil chamber (17) and the third oil chamber (18), so at this time the second oil chamber (17), the third oil chamber 18) and the fourth oil chamber (19) are all connected and discharge oil; At this time, it is in the small displacement state; When the second main hole (12) admits oil and the first main hole (11) returns oil, there is an opposite circuit. At large displacement, the first oil chamber (16) communicates with the second oil chamber (17), and the third oil chamber (18) communicates with the fourth oil chamber (19). At this time, the reversing spool (3) is in contact with the plug (8) on the left side and the reversing spool (3) also communicates the first oil chamber (16) and the second oil chamber (17). At small displacement, the control orifice (13) admits high-pressure oil, and the variable spool (7) moves away from the rear cover plate (4) under the action of the control oil to connect the second oil chamber (17) with the third oil chamber (18). At this time, the reversing spool (3) is in contact with the plug (8) on the left side and the reversing spool (3) connects the first oil chamber (16), the second oil chamber (17) and the third oil chamber (18) and returns oil. The variable spool (7) includes a first groove (7A) and a second groove (7B), and the second groove (7B) is provided on one side of the first groove (7A).

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