Cycloidal hydraulic motor with speed-changing structure

Abstract

The present invention relates to the technical field of cycloid hydraulic motors, and in particular to a cycloid hydraulic motor with a speed-changing structure, comprising a motor assembly and a dual-speed valve assembly, wherein the dual-speed valve assembly comprises a dual-speed valve body and a dual-speed valve core, wherein the dual-speed valve core is slidably matched or slidably connected with the dual-speed valve body; the dual-speed valve body is provided with m oil chambers, m≥2, wherein n oil chambers are high-pressure oil chambers, n≥1, and e oil chambers are low-pressure oil chambers, e≥1, n+e=m; the oil distribution valve is provided with k oil holes, k≥2, wherein each of the m oil chambers is connected to at least one of the k oil holes, and each of the k oil holes is connected to only one oil chamber. The cycloid hydraulic motor with a speed-changing structure of the present invention generates a proportional increase or decrease in displacement when switching speeds, thereby reducing the impact when switching speed displacements, improving the stability of speed changes, and improving the comfort when changing speeds.

Description

Technical Field

[0001] The present invention relates to the technical field of cycloidal motors, and in particular to a cycloidal hydraulic motor with a speed-changing structure. Background Art

[0002] Cycloidal motors are increasingly used in mobile machinery. Generally, mobile machinery requires dual-speed function. The speed change of the cycloidal motor is achieved by changing the motor displacement, that is, by controlling the motor's oil distribution mechanism, directly switching from 400cc displacement to 200cc. This switching method has the problems of large impact, unstable speed change, and poor comfort. Summary of the invention

[0003] The technical problem to be solved by the present invention is that when the existing cycloid hydraulic motor changes speed, the switching mode has the problems of large impact, unstable speed change and poor comfort. To this end, the present invention provides a cycloid hydraulic motor with a speed change structure, which generates a proportional increase or decrease in displacement when switching speed, reduces the impact when switching speed and displacement, improves the stability of speed change, and improves the comfort when changing speed.

[0004] In order to solve the above technical problems, the present invention provides a cycloid hydraulic motor with a speed change structure, including a motor assembly and a dual-speed valve assembly, wherein the motor assembly includes a motor housing, a distribution plate and an oil distribution valve, wherein the oil distribution valve is installed in the motor housing and connected to the motor housing, and the distribution plate is installed on one side of the oil distribution valve and cooperates with the oil distribution valve, and the dual-speed valve assembly includes:

[0005] A two-speed valve body, the two-speed valve body is connected to the motor housing, the two-speed valve body is provided with an oil inlet and an oil outlet, and the two-speed valve body is provided with a valve body chamber;

[0006] A dual-speed valve core, the dual-speed valve core is installed in the valve body cavity, the dual-speed valve core is slidably matched or slidably connected with the dual-speed valve body, and dual-speed valve springs are provided at both ends of the dual-speed valve core;

[0007] The dual-speed valve body is provided with m oil chambers, m≥2, of which n oil chambers are high-pressure oil chambers, n≥1, and e oil chambers are low-pressure oil chambers, e≥1, n+e=m; the oil inlet and oil return of the high-pressure oil chamber and the low-pressure oil chamber are controlled by the axial movement of the dual-speed valve core;

[0008] The oil distribution valve is provided with k oil holes, k≥2, each of the m oil chambers is connected with at least one oil hole of the k oil holes, and each of the k oil holes is connected with only one oil chamber.

[0009] Preferably, a plurality of annular grooves are provided in the valve body cavity, and the plurality of annular grooves are distributed along the axial direction of the dual-speed valve core, and the oil flow in the annular grooves is controlled by the axial movement of the dual-speed valve core.

[0010] Preferably, the dual-speed valve body is provided with six oil chambers, namely the first oil chamber, the second oil chamber, ..., the fifth oil chamber and the sixth oil chamber, and the oil distribution valve is provided with sixteen oil holes, namely the first oil hole, the second oil hole, ..., the fifteenth oil hole and the sixteenth oil hole, the first oil hole, the fifth oil hole, the ninth oil hole and the thirteenth oil hole are all connected to the first oil chamber, the third oil hole and the eleventh oil hole are both connected to the second oil chamber, the seventh oil hole and the fifteenth oil hole are both connected to the third oil chamber, the sixteenth oil hole and the eighth oil hole are both connected to the fourth oil chamber, the fourth oil hole and the twelfth oil hole are both connected to the fifth oil chamber, and the second oil hole, the sixth oil hole, the tenth oil hole and the fourteenth oil hole are all connected to the sixth oil chamber.

[0011] Preferably, the dual-speed valve body is provided with two plugging heads, the two plugging heads are respectively located at two ends of the dual-speed valve core, and the two plugging heads are fixedly connected to the dual-speed valve body.

[0012] Preferably, the motor assembly also includes a linkage shaft, a stator and a rotor, the rotor is connected to the oil distribution valve via the linkage shaft, the stator is provided with a cavity, the rotor is installed in the cavity of the stator, the stator and the rotor are connected for relative rotation, a rotating wheel is rotatably connected to the motor housing, and the stator is connected to the rotating wheel.

[0013] Preferably, a compensation groove is provided between the oil distribution valve and the dual-speed valve body, and the high-pressure oil enters the compensation groove and acts on the side of the oil distribution valve to generate sealing compensation.

[0014] Preferably, a disc spring is arranged in the compensation groove, and the disc spring provides a pressing force to the oil distribution valve to improve the sealing between the distribution plate and the oil distribution valve.

[0015] Preferably, the surfaces of the oil distribution valve and the distribution disk that cooperate with each other form a sealing surface, and the sealing surface is a spherical surface to prevent oil from leaking from between the oil distribution valve and the distribution disk.

[0016] Preferably, the oil distribution valve is cylindrical to facilitate processing of the oil distribution valve, installation between the oil distribution valve and the motor housing, and positioning through the cooperation between the outer circumferential surface of the oil distribution valve and the inner side surface of the motor housing.

[0017] Preferably, the motor housing is provided with m communicating holes, m≥2, and the m communicating holes are connected to the m oil chambers in a one-to-one correspondence.

[0018] Preferably, the motor housing is provided with m oil grooves, m≥2, the m oil grooves are connected to the m connecting holes in a one-to-one correspondence, the oil distribution valve is provided with m annular connecting grooves, the m annular connecting grooves are connected to the m oil grooves in a one-to-one correspondence, each of the m annular connecting grooves is connected to at least one of the k oil holes, and each of the k oil holes is connected to only one annular connecting groove.

[0019] The beneficial effects of the cycloid hydraulic motor with a speed change structure of the present invention are as follows:

[0020] 1. Each of the m oil chambers is connected to at least one of the k oil holes, and each of the k oil holes is connected to only one oil chamber. When switching speeds, the motor produces a proportional increase or decrease in displacement, which reduces the impact of switching speeds, improves the stability of speed changes, and improves the comfort of speed changes.

[0021] 2. Due to the lateral load on the cycloid hydraulic motor structure during use, when the bearing is subjected to radial load, the radial clearance changes, resulting in radial floating between the distribution plate and the oil distribution valve. The sealing surface between the oil distribution valve and the distribution plate is a spherical surface, which can effectively compensate for the radial micro-motion here, reduce end face leakage, and reduce the wear of the distribution plate and the oil distribution valve.

[0022] 3. A compensation groove is provided between the oil distribution valve and the valve body. The high-pressure oil of the motor is introduced into the compensation groove through the compensation channel through the shuttle valve. The pressure will directly act on the side of the oil distribution valve, thereby generating sealing compensation and improving the efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is a schematic diagram of the overall structure of the cycloid hydraulic motor with a speed-changing structure of the present invention.

[0025] Figure 2 It is a schematic cross-sectional structure diagram of a cycloid hydraulic motor with a speed-changing structure according to the present invention.

[0026] Figure 3 It is a schematic cross-sectional structure diagram of the stator and the rotor matching in an embodiment of the present invention.

[0027] Figure 4 Schematic diagram of the structure of the oil distribution valve in the embodiment of the present invention.

[0028] Figure 5 It is a schematic diagram of the end structure of the oil distribution valve in an embodiment of the present invention.

[0029] Figure 6 It is a schematic diagram of the state when the dual-speed valve core is located in the middle position in the embodiment of the present invention.

[0030] Figure 7 It is a schematic diagram of the state when the dual-speed valve core is located in the transition position in the embodiment of the present invention.

[0031] Figure 8 1 is a schematic diagram of the state when the dual-speed valve core is in the final position in the embodiment of the present invention.

[0032] Fig. 9 Schematic diagram of the structure of the housing in the embodiment of the present invention.

[0033] Fig.10 2 is a schematic diagram of an end face of a shell in an embodiment of the present invention.

[0034] In the figure:

[0035] 100, motor assembly; 101, motor housing; 102, distribution plate; 103, oil distribution valve; 104, linkage shaft; 105, stator; 106, rotor; 107, rotating wheel; 108, compensation groove; 109, disc spring; 110, sealing surface; 111, oil groove; 112, first oil hole; 113, second oil hole; 114, third oil hole; 115, fourth oil hole; 116, fifth oil hole; 117, sixth oil hole; 118, seventh oil hole; 119, eighth oil hole; 12 0, the ninth oil hole; 121, the tenth oil hole; 122, the eleventh oil hole; 123, the twelfth oil hole; 124, the thirteenth oil hole; 125, the fourteenth oil hole; 126, the fifteenth oil hole; 127, the sixteenth oil hole; 128, the first annular connecting groove; 129, the second annular connecting groove; 130, the third annular connecting groove; 131, the fourth annular connecting groove; 132, the fifth annular connecting groove; 133, the sixth annular connecting groove; 134, the connecting hole; 135, the column; 136, the oil cavity;

[0036] 200, dual-speed valve assembly; 201, dual-speed valve body; 202, dual-speed valve core; 203, dual-speed valve spring; 204, annular groove; 205, first oil chamber; 206, second oil chamber; 207, third oil chamber; 208, fourth oil chamber; 209, fifth oil chamber; 210, sixth oil chamber; 211, plugging head. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] refer to Figures 1 to 10 The present invention provides a cycloidal hydraulic motor with a speed-changing structure, comprising a motor assembly 100 and a dual-speed valve assembly 200. The motor assembly 100 comprises a motor housing 101, an oil distribution valve 103, a distribution plate 102, a linkage shaft 104, a stator 105 and a rotor 106. The oil distribution valve 103 is installed in the motor housing 101 and connected to the motor housing 101. The oil distribution valve 103 is cylindrical with an annular connecting groove on the outer circumference to facilitate the processing of the oil distribution valve 103. The outer circumferential surface of the oil distribution valve 103 is matched with the inner side surface of the motor housing 101 for positioning, so that the oil distribution valve 103 can be easily adjusted. 03 is installed between the motor housing 101, the rotor 106 is connected to the oil distribution valve 103 through the linkage shaft 104, the distribution plate 102 is installed on one side of the oil distribution valve 103, and cooperates with the oil distribution valve 103, the stator 105 is provided with a cavity, the rotor 106 is installed in the cavity of the stator 105, the stator 105 and the rotor 106 are connected for relative rotation, the motor housing 101 is rotatably connected with a rotating wheel 107, the stator 105 is connected to the rotating wheel 107, the stator 105 is located on one side of the distribution plate 102, and the side of the stator 105 away from the distribution plate 102 is provided with an end cover, and the end cover is connected to the stator 105.

[0040] The dual-speed valve assembly 200 includes a dual-speed valve body 201 and a dual-speed valve core 202. The dual-speed valve body 201 is connected to the motor housing 101. The dual-speed valve body 201 is provided with an oil inlet and an oil outlet. The dual-speed valve body 201 is provided with a valve body chamber. The dual-speed valve core 202 is installed in the valve body chamber. The dual-speed valve core 202 is slidably matched or slidably connected with the dual-speed valve body 201. Dual-speed valve springs 203 are provided at both ends of the dual-speed valve core 202. The dual-speed valve body 201 is provided with two plugging heads 211. The two plugging heads 211 are respectively located at the two ends of the dual-speed valve core 202. The two plugging heads 211 are fixedly connected to the dual-speed valve body 201. A plurality of rings are provided in the valve body chamber. shaped groove 204, multiple annular grooves 204 are distributed along the axial direction of the dual-speed valve core 202, and the oil flow of the annular grooves 204 is controlled by the axial movement of the dual-speed valve core 202; the dual-speed valve body 201 is provided with m oil chambers, m≥2, of which n oil chambers are high-pressure oil chambers, n≥1, and e oil chambers are low-pressure oil chambers, e≥1, n+e=m; the oil inlet and return of the high-pressure oil chamber and the low-pressure oil chamber are controlled by the axial movement of the dual-speed valve core 202; the oil distribution valve 103 is provided with k oil holes, k≥2, each of the m oil chambers is connected to at least one oil hole of the k oil holes, and each of the k oil holes is connected to only one oil chamber.

[0041] In one embodiment of the present invention, the dual-speed valve body 201 is provided with six oil chambers, namely the first oil chamber 205, the second oil chamber 206, the third oil chamber 207, the fourth oil chamber 208, the fifth oil chamber 209 and the sixth oil chamber 210, and the oil distribution valve 103 is provided with sixteen oil holes, which are arranged in sequence along a circle with the center of the oil distribution valve 103 as the center. The sixteen oil holes are respectively the first oil hole 112, the second oil hole 113, the third oil hole 114, the fourth oil hole 115, the fifth oil hole 116, the sixth oil hole 117, the seventh oil hole 118, the eighth oil hole 119, the ninth oil hole 120, the tenth oil hole 121, the eleventh oil hole 122, the twelfth oil hole 123, the thirteenth oil hole 124, the The first oil hole 112, the fifth oil hole 116, the ninth oil hole 120 and the thirteenth oil hole 124 are all connected to the first oil chamber 205, the third oil hole 114 and the eleventh oil hole 122 are all connected to the second oil chamber 206, the seventh oil hole 118 and the fifteenth oil hole 126 are all connected to the third oil chamber 207, the sixteenth oil hole 127 and the eighth oil hole 119 are all connected to the fourth oil chamber 208, the fourth oil hole 115 and the twelfth oil hole 123 are all connected to the fifth oil chamber 209, and the second oil hole 113, the sixth oil hole 117, the tenth oil hole 121 and the fourteenth oil hole 125 are all connected to the sixth oil chamber 210.

[0042] In one embodiment of the present invention, the oil distribution valve 103 is fixed to the motor housing 101 by pins, the rotor 106 is connected to the oil distribution valve 103 by a linkage shaft 104, the oil distribution valve 103, the rotor 106 and the linkage shaft 104 are all non-rotatable, the stator 105 is mounted on the rotor 106, and the stator 105 is connected to the rotating wheel 107. Specifically, the stator 105, the distribution plate 102 and the rotating wheel 107 are connected by screws. When the stator 105 rotates, the distribution plate 102 and the rotating wheel 107 rotate together with the stator 105.

[0043] In one embodiment of the present invention, the rotor 106 is installed in the cavity of the stator 105, and the rotor 106 is eccentrically arranged in the cavity of the stator 105. A plurality of cylinders 135 are installed on the inner side of the stator 105, and the plurality of cylinders 135 are arranged circumferentially along the inner surface of the stator 105. In this embodiment, there are nine cylinders 135, and a plurality of arc surfaces are formed on the outer circumference of the rotor 106. The plurality of arc surfaces protrude radially outward along the cylinder 135, and two adjacent arc surfaces are connected by transition of the inner arc surface. The plurality of arc surfaces are evenly arranged along the circumference of the rotor 106, and the arc surfaces are attached to the outer circumferential surfaces of the cylinders 135, so that the arc surfaces and the outer circumferential surfaces of the cylinders 135 form a linear When the stator 105 rotates, the outer circumferential surface of the cylinder 135 is always in contact with the arc surface or the inner arc surface, and an oil cavity 136 is formed between the inner side surface of the stator 105, the outer circumferential surface of the cylinder 135 and the outer circumferential surface of the rotor 106. In the present embodiment, there are nine cylinders 135, nine arc surfaces, and nine oil cavities 136. When high-pressure oil enters the oil cavity 136, the oil cavity 136 tends to expand in volume under the action of the oil pressure, so the oil will drive the stator 105 to rotate. Since the stator 105 rotates and the rotor 106 is eccentrically arranged in the oil cavity 136 in the stator 105, the rotor 106 will swing.

[0044] When the dual-speed valve core 202 is located in the middle position of the valve body chamber, the first oil chamber 205, the second oil chamber 206 and the third oil chamber 207 are connected to high-pressure oil, and the fourth oil chamber 208, the fifth oil chamber 209 and the sixth oil chamber 210 are connected to low-pressure oil. The oil distribution on the oil distribution valve 103 is as follows: the first oil hole 112, the fifth oil hole 116, the ninth oil hole 120, the thirteenth oil hole 124, the third oil hole 114, the eleventh oil hole 122, the seventh oil hole 118 and the fifteenth oil hole 126 are high pressure, and the sixteenth oil hole 127, the eighth oil hole 119, the fourth oil hole 115 and the twelfth oil hole 123, the second oil hole 113, the sixth oil hole 117, the tenth oil hole 121 and the fourteenth oil hole 125 are low pressure, so that eight high-pressure holes can be formed on the oil distribution valve 103, and eight low-pressure holes are distributed at intervals. When the distribution plate 102 rotates one circle, each of the nine oil chambers 136 on the distribution plate 102 can complete eight high-low pressure conversions, that is, there are a total of 9×8=72 high-low pressure changes, that is, the oil chamber volume of the motor changes seventy-two times.

[0045] When the dual-speed valve core 202 is located at the transition position of the valve body chamber, that is, between the middle position and the rightmost position, the first oil chamber 205, the second oil chamber 206, the third oil chamber 207, and the fourth oil chamber 208 are connected to high-pressure oil, and the fifth oil chamber 209 and the sixth oil chamber 210 are connected to low-pressure oil. The oil distribution on the oil distribution valve 103 is as follows: the first oil hole 112, the fifth oil hole 116, the ninth oil hole 120, the thirteenth oil hole 124, the third oil hole 114, the eleventh oil hole 122, the seventh oil hole 118 and the fifteenth oil hole 126, the sixteenth oil hole 127 and the eighth oil hole 119 are high pressure, the fourth oil hole 115, the twelfth oil hole 123, the second oil hole 113, the sixth oil hole 117, the tenth oil hole 121 and the fourteenth oil hole 125 are low pressure, In this way, ten high-pressure holes and six low-pressure holes can be formed on the oil distribution valve 103 with intervals. When the distribution plate 102 rotates one circle, each of the nine oil chambers 136 on the distribution plate 102 can complete six high-low pressure conversions, that is, there are a total of 9×6=54 high-low pressure changes, that is, the oil chamber volume of the motor changes fifty-four times, so the motor displacement is 54÷72=75% of the state when the dual-speed valve core 202 is located in the middle position of the valve body chamber.

[0046] When the dual-speed valve core 202 is located at the final position of the valve body chamber, that is, when the dual-speed valve core 202 moves to the rightmost position, the first oil chamber 205, the second oil chamber 206, the third oil chamber 207, the fourth oil chamber 208, and the fifth oil chamber 209 are connected to high-pressure oil, and the sixth oil chamber 210 is connected to low-pressure oil. The oil distribution on the oil distribution valve 103 is as follows: the first oil hole 112, the fifth oil hole 116, the ninth oil hole 120, the thirteenth oil hole 124, the third oil hole 114, the eleventh oil hole 122, the seventh oil hole 118, the fifteenth oil hole 126, the sixteenth oil hole 127, the eighth oil hole 119, the fourth oil hole 115, and the twelfth oil hole 123 are high pressure, and the second oil hole 113, the sixth oil hole 117, the tenth oil hole 121, and the fourteenth oil hole 125 are low pressure, so that twelve high-pressure holes and four low-pressure holes can be formed on the oil distribution valve 103. When the distribution plate 102 rotates one circle, each of the nine oil chambers 136 on the distribution plate 102 can complete four high-low pressure conversions, that is, there are a total of 9×4=364 high-low pressure changes, that is, the oil chamber volume of the motor changes thirty-six times, so the motor displacement is 36÷72=50% of the state when the dual-speed valve core 202 is located in the middle position of the valve body chamber.

[0047] When the dual-speed valve core 202 switches from the middle position of the valve body chamber to the transition position, the motor displacement is seventy-five percent of the state in which the dual-speed valve core 202 is located in the middle position of the valve body chamber; when the dual-speed valve core 202 switches from the transition position to the final position, the motor displacement is fifty percent of the state in which the dual-speed valve core 202 is located in the middle position of the valve body chamber. That is to say, when the dual-speed valve core 202 switches from the middle position of the valve body chamber to the transition position, the motor displacement is relatively reduced by 25%; when the dual-speed valve core 202 switches from the transition position of the valve body chamber to the final position, the motor displacement is also relatively reduced by 25%. When switching speeds, the motor produces a proportional increase or decrease in displacement, which reduces the impact when switching speed displacement, improves the stability of speed changing, and improves the comfort when changing speed.

[0048] In one embodiment of the present invention, the motor housing 101 is provided with m communicating holes 134, m≥2, and the m communicating holes 134 are connected to the m oil chambers in a one-to-one correspondence. The motor housing 101 is provided with m oil grooves 111, m≥2, and the m oil grooves 111 are connected to the m communicating holes 134 in a one-to-one correspondence. The oil distribution valve 103 is provided with m annular communicating grooves, and the m annular communicating grooves are connected to the m oil grooves 111 in a one-to-one correspondence. Each of the m annular communicating grooves is connected to at least one oil hole among the k oil holes, and each of the k oil holes is connected to only one annular communicating groove.

[0049] Specifically, in the embodiment of the present invention, six communicating holes 134 are provided on the dual-speed valve body 201, and the six communicating holes 134 are arranged in sequence, and the six communicating holes 134 are respectively connected to the first oil chamber 205, the second oil chamber 206, the third oil chamber 207, the fourth oil chamber 208, the fifth oil chamber 209 and the sixth oil chamber 210; six oil grooves 111 are provided on the motor housing 101, and six annular communicating grooves are provided on the oil distribution valve 103, and the six oil grooves 111 are connected to the six communicating holes 134 in a one-to-one correspondence, and the six annular communicating grooves are connected to the six oil grooves 111 in a one-to-one correspondence, and the six annular communicating grooves are respectively: the first annular communicating groove 128, the second annular communicating groove 129, the third annular communicating groove 130, the fourth annular communicating groove 131, the fifth oil chamber 209 and the sixth oil chamber 210. The connecting groove 131, the fifth annular connecting groove 132 and the sixth annular connecting groove 133, the first annular connecting groove 128 is connected with the first oil chamber 205 through the connecting hole 134 and the oil-through groove 111; the second annular connecting groove 129 is connected with the second oil chamber 206 through the connecting hole 134 and the oil-through groove 111; the third annular connecting groove 130 is connected with the third oil chamber 207 through the connecting hole 134 and the oil-through groove 111; the fourth annular connecting groove 131 is connected with the fourth oil chamber 208 through the connecting hole 134 and the oil-through groove 111; the fifth annular connecting groove 132 is connected with the fifth oil chamber 209 through the connecting hole 134 and the oil-through groove 111; the sixth annular connecting groove 133 is connected with the sixth oil chamber 210 through the connecting hole 134 and the oil-through groove 111.

[0050] In one embodiment of the present invention, a compensation groove 108 is provided between the oil distribution valve 103 and the two-speed valve body 201. The high-pressure oil in the motor enters the compensation groove 108 and acts on the side of the oil distribution valve 103 to generate sealing compensation. A compensation channel is provided on the two-speed valve body 201, and the compensation channel is connected to the compensation groove 108. A shuttle valve is provided on the two-speed valve body 201, and the shuttle valve is connected to the compensation channel. The motor high-pressure oil is introduced into the compensation groove 108 through the compensation channel through the shuttle valve. The pressure will directly act on the side of the oil distribution valve 103, forming a clamping force on the side of the oil distribution valve 103. The force can ensure the clamping force between the distribution disk 102 and the oil distribution valve 103, and prevent oil from leaking between the distribution disk 102 and the end face of the oil distribution valve 103, thereby generating sealing compensation and improving the efficiency of the motor.

[0051] In one embodiment of the present invention, a disc spring 109 is arranged in the compensation groove 108. Before the high-pressure oil is introduced into the compensation groove 108, the disc spring ensures the clamping force between the distribution plate 102 and the oil distribution valve 103 to avoid oil leakage, thereby improving the starting efficiency. In addition, since the compensation groove 108 is arranged on the end face, the outer diameter of the oil distribution valve 103 can be made into an equal size to reduce the processing difficulty.

[0052] In one embodiment of the present invention, the surfaces of the oil distribution valve 103 and the distribution disk 102 that match each other form a sealing surface 110 to prevent oil from leaking from between the oil distribution valve 103 and the distribution disk 102. Preferably, the sealing surface 110 is a spherical surface. Since the cycloid hydraulic motor structure is subject to lateral loads during use, when the bearing is subjected to radial loads, radial clearance changes occur, resulting in radial floating between the distribution disk 102 and the oil distribution valve 103. The sealing surface 110 between the oil distribution valve 103 and the distribution disk 102 is a spherical surface, which can effectively compensate for the radial micro-motion here, reduce end face leakage, and reduce the wear of the distribution disk 102 and the oil distribution valve 103.

[0053] In one embodiment of the present invention, the rotating disk is connected to the motor housing 101 through a bearing, the inner ring of the bearing cooperates with the outer circumference of the outer housing, and the outer ring of the bearing cooperates with the inner wall of the rotating disk, so that the rotating disk and the motor housing 101 can rotate relative to each other, and a step for installing the bearing is also provided on the outer circumference of the motor housing 101 to facilitate positioning of the bearing.

[0054] In one embodiment of the present invention, a sealing ring is provided between the motor housing 101 and the distribution plate 102 , thereby improving the sealing performance of the cycloid hydraulic motor structure and preventing oil from leaking from the gap between the motor housing 101 and the distribution plate 102 .

[0055] The beneficial effects of the cycloid hydraulic motor with a speed change structure of the present invention are as follows:

[0056] 1. Each of the m oil chambers is connected to at least one of the k oil holes, and each of the k oil holes is connected to only one oil chamber. When switching speeds, the motor produces a proportional increase or decrease in displacement, which reduces the impact of switching speeds, improves the stability of speed changes, and improves the comfort of speed changes.

[0057] 2. Since the cycloid hydraulic motor structure is subject to lateral loads during use, when the bearing is subjected to radial loads, radial clearance changes occur, resulting in radial floating between the distribution plate 102 and the oil distribution valve 103. The sealing surface 110 between the oil distribution valve 103 and the distribution plate 102 is a spherical surface, which can effectively compensate for the radial micro-motion here, reduce end face leakage, and reduce the wear of the distribution plate 102 and the oil distribution valve 103.

[0058] 3. A compensation groove 108 is provided between the oil distribution valve 103 and the valve body. The motor high-pressure oil is introduced into the compensation groove 108 through the compensation channel via the shuttle valve. The pressure will directly act on the side of the oil distribution valve 103, thereby generating sealing compensation and improving the efficiency of the motor.

[0059] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A cycloidal hydraulic motor with a speed-changing structure, comprising a motor assembly (100) and a dual-speed valve assembly (200), wherein the motor assembly (100) comprises a motor housing (101), a distribution plate (102) and an oil distribution valve (103), wherein the oil distribution valve (103) is installed in the motor housing (101) and connected to the motor housing (101), and the distribution plate (102) is installed on one side of the oil distribution valve (103) and cooperates with the oil distribution valve (103). It is characterized in that The dual-speed valve assembly (200) comprises: A dual-speed valve body (201), the dual-speed valve body (201) being connected to the motor housing (101), the dual-speed valve body (201) being provided with an oil inlet and an oil outlet, and the dual-speed valve body (201) being provided with a valve body chamber; A dual-speed valve core (202), the dual-speed valve core (202) being installed in the valve body chamber, the dual-speed valve core (202) being slidably matched or slidably connected to the dual-speed valve body (201), and dual-speed valve springs (203) being provided at both ends of the dual-speed valve core (202); The dual-speed valve body (201) is provided with m oil chambers, m≥2, of which n oil chambers are high-pressure oil chambers, n≥1, and e oil chambers are low-pressure oil chambers, e≥1, n+e=m; the dual-speed valve core (202) is moved axially to control the oil inlet and oil return of the high-pressure oil chamber and the low-pressure oil chamber; The oil distribution valve (103) is provided with k oil holes, k≥2, each of the m oil chambers is connected to at least one of the k oil holes, and each of the k oil holes is connected to only one oil chamber; The motor assembly (100) further comprises a linkage shaft (104), a stator (105) and a rotor (106); the rotor (106) is connected to the oil distribution valve (103) via the linkage shaft (104); a cavity is provided in the stator (105); the rotor (106) is installed in the cavity of the stator (105); the stator (105) and the rotor (106) are connected to rotate relative to each other; a rotating wheel (107) is rotatably connected to the motor housing (101); the stator (105) is connected to the rotating wheel (107); A compensation groove (108) is provided between the oil distribution valve (103) and the dual-speed valve body (201), and high-pressure oil enters the compensation groove (108) and acts on the side of the oil distribution valve (103) to generate sealing compensation; A disc spring (109) is arranged in the compensation groove (108), and the disc spring (109) provides a pressing force on the oil distribution valve (103) to improve the sealing performance between the distribution plate (102) and the oil distribution valve (103); The surfaces of the oil distribution valve (103) and the distribution disk (102) that match each other form a sealing surface (110), and the sealing surface (110) is a spherical surface to prevent oil from leaking between the oil distribution valve (103) and the distribution disk (102).

2. The cycloid hydraulic motor with a speed change structure according to claim 1, It is characterized in that The dual-speed valve body (201) is provided with six oil chambers, namely a first oil chamber (205), a second oil chamber (206), a third oil chamber (207), a fourth oil chamber (208), a fifth oil chamber (209) and a sixth oil chamber (210); the oil distribution valve (103) is provided with sixteen oil holes, namely a first oil hole (112), a second oil hole (113), a third oil hole (114), a fourth oil hole (115), a fifth oil hole (116), a sixth oil hole (117), a seventh oil hole (118), an eighth oil hole (119), a ninth oil hole (120), a tenth oil hole (121), an eleventh oil hole (122), a twelfth oil hole (123), a thirteenth oil hole (124), a fourteenth oil hole (125), a fifteenth oil hole (126) ) and the sixteenth oil hole (127), the first oil hole (112), the fifth oil hole (116), the ninth oil hole (120) and the thirteenth oil hole (124) are all connected to the first oil chamber (205), the third oil hole (114) and the eleventh oil hole (122) are all connected to the second oil chamber (206), the seventh oil hole (118) and the fifteenth oil hole (126) are all connected to the third oil chamber (207), the sixteenth oil hole (127) and the eighth oil hole (119) are all connected to the fourth oil chamber (208), the fourth oil hole (115) and the twelfth oil hole (123) are all connected to the fifth oil chamber (209), and the second oil hole (113), the sixth oil hole (117), the tenth oil hole (121) and the fourteenth oil hole (125) are all connected to the sixth oil chamber (210).

3. The cycloid hydraulic motor with a speed change structure according to claim 1, It is characterized in that A plurality of annular grooves (204) are provided in the valve body cavity, and the plurality of annular grooves (204) are distributed along the axial direction of the dual-speed valve core (202). The movement of the dual-speed valve core (202) along the axial direction controls the oil flow in the annular grooves (204).

4. The cycloid hydraulic motor with a speed change structure according to claim 1, It is characterized in that The dual-speed valve body (201) is provided with two plugging heads (211), the two plugging heads (211) are respectively located at two ends of the dual-speed valve core (202), and the two plugging heads (211) are fixedly connected to the dual-speed valve body (201).

5. The cycloid hydraulic motor with a speed change structure according to claim 1, It is characterized in that The oil distribution valve (103) is cylindrical, so as to facilitate processing of the oil distribution valve (103), installation between the oil distribution valve (103) and the motor housing (101), and positioning through the cooperation between the outer circumferential surface of the oil distribution valve (103) and the inner side surface of the motor housing (101).

6. The cycloid hydraulic motor with a speed change structure according to claim 1, It is characterized in that The motor housing (101) is provided with m communication holes (134), where m≥2, and the m communication holes (134) are connected to the m oil chambers in a one-to-one correspondence.

7. The cycloid hydraulic motor with a speed change structure as claimed in claim 6, It is characterized in that The motor housing (101) is provided with m oil through grooves (111), where m ≥ 2. The m oil through grooves (111) are in one-to-one correspondence and communication with m communication holes (134). The oil distribution valve (103) is provided with m annular communication grooves, and the m annular communication grooves are in one-to-one correspondence and communication with the m oil through grooves (111). Each of the m annular communication grooves is in communication with at least one of the k oil holes, and each of the k oil holes is only in correspondence and communication with one annular communication groove.

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