A flow distribution mechanism used in hydraulic pumps

Abstract

The present invention relates to a flow distribution mechanism for a hydraulic pump, comprising a flow distribution plate, provided with an oil suction hole, an oil discharge hole, a low-pressure inlet waist-shaped groove, and a high-pressure outlet waist-shaped groove, wherein the low-pressure inlet waist-shaped groove is internally connected to a first oil hole, and the other end of the first oil hole is connected to the hydraulic pump housing cavity; a high-pressure bushing assembly, one end of which is connected to the high-pressure outlet waist-shaped groove, and the other end of which is connected to the hydraulic pump outlet; two oil hole bushing assemblies, wherein one oil hole bushing assembly is connected to the oil suction hole at one end and to the hydraulic pump housing cavity at the other end, and the other oil hole bushing assembly is connected to the oil discharge hole at one end and to the hydraulic pump return oil port at the other end; wherein the cylinder body of the hydraulic pump rotates around the flow distribution plate, driving the internal rotor plunger cavity of the hydraulic pump to communicate with the oil suction hole, the low-pressure inlet waist-shaped groove, the oil discharge hole, or the high-pressure outlet waist-shaped groove. This solves the problem that the existing hydraulic pump has an independent built-in oil return pump, which reduces product reliability and significantly increases product weight.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pumps, and in particular to a flow distribution mechanism applied to a hydraulic pump. Background Art

[0002] The hydraulic pump is the heart of an aircraft's hydraulic system and is crucial for its operation. However, its internal structure is complex and sophisticated, and it often operates under high temperatures, high pressures, and high speeds. High temperatures, in particular, can significantly reduce the viscosity of the hydraulic oil, thinning the working oil film in friction pairs, bearings, and other components, reducing its service life and potentially causing wear and failure of the hydraulic pump, leading to aircraft accidents.

[0003] By adding a forced oil return drain function, the low-temperature hydraulic oil drawn from the tank by the hydraulic pump can be circulated through the casing and then forced out of the oil return port. This significantly reduces the internal oil temperature of the pump, which is the highest temperature, and achieves a significant heat dissipation effect. While adding a forced oil drain function by integrating a separate oil return pump into the hydraulic pump can achieve forced oil return drain, the addition of additional functional components reduces product reliability and significantly increases product weight. If the forced oil return drain function can be integrated with the hydraulic pump flow distribution function, it can meet the demand for weight reduction and high reliability in aerospace hydraulic pumps and has broad market prospects. Summary of the Invention

[0004] In order to solve the problem that the existing hydraulic pump has a built-in independent oil return pump, which leads to reduced product reliability and a significant increase in product weight, the present invention provides a flow distribution mechanism applied to the hydraulic pump.

[0005] In a first aspect, the present invention provides a flow distribution mechanism for a hydraulic pump, comprising:

[0006] The valve plate is provided with at least one oil suction hole, at least one oil discharge hole, a low-pressure inlet waist-shaped groove, and a high-pressure outlet waist-shaped groove in the direction of rotation of the hydraulic pump. The oil suction hole and the low-pressure inlet waist-shaped groove are located in the oil suction half area of the valve plate, and the oil discharge hole and the high-pressure outlet waist-shaped groove are located in the oil discharge half area of the valve plate. The low-pressure inlet waist-shaped groove is further connected to a first oil hole, and the other end of the first oil hole is connected to the hydraulic pump housing cavity;

[0007] A high-pressure bushing assembly is fixed on the valve plate, one end of the high-pressure bushing assembly is connected to the high-pressure outlet waist groove, and the other end is connected to the hydraulic pump outlet;

[0008] At least two oil hole bushing assemblies are fixed to the valve plate and are located on the same side of the valve plate as the high-pressure bushing assembly, one end of one of the oil hole bushing assemblies is connected to the oil suction hole and the other end is connected to the hydraulic pump housing cavity, and one end of the other oil hole bushing assembly is connected to the oil discharge hole and the other end is connected to the oil return port of the hydraulic pump;

[0009] The cylinder of the hydraulic pump rotates around the distribution plate, driving the internal rotor plunger cavity of the hydraulic pump to communicate with the oil suction hole, low-pressure inlet waist-shaped groove, oil discharge hole or high-pressure outlet waist-shaped groove.

[0010] In some embodiments, the axes of the oil suction hole, the oil discharge hole, the low-pressure inlet waist-shaped groove and the high-pressure outlet waist-shaped groove are all located on the same arc.

[0011] In some embodiments, the high-pressure bushing assembly includes a first bushing, a first accommodating groove is recessed on the distribution plate, and the outer wall of the first bushing is provided with a first sealing ring and a first protective ring for cooperating and sealing with the end face of the first accommodating groove.

[0012] In some embodiments, at least two of the oil hole bushing assemblies include a second bushing, wherein the outer wall of one of the second bushings is provided with a second sealing ring and a second protective ring for cooperating and sealing with the inner wall of the oil suction hole, and the outer wall of the other second bushing is provided with a third sealing ring and a third protective ring for cooperating and sealing with the inner wall of the oil discharge hole.

[0013] In some embodiments, the inner diameter of the first bushing is greater than the inner diameter of the second bushing.

[0014] In some embodiments, the distribution plate includes two oil suction holes and two oil discharge holes, and along the rotation direction of the cylinder body of the hydraulic pump, they are the first oil suction hole, the low-pressure inlet waist-shaped groove, the second oil suction hole, the first oil discharge hole, the high-pressure outlet waist-shaped groove and the second oil discharge hole.

[0015] In some embodiments, along the rotation direction of the cylinder body of the hydraulic pump, the distance between the first oil suction hole and the low-pressure inlet waist-shaped groove is equal to the distance between the second oil suction hole and the low-pressure inlet waist-shaped groove; the distance between the first oil discharge hole and the high-pressure outlet waist-shaped groove is equal to the distance between the second oil discharge hole and the high-pressure outlet waist-shaped groove.

[0016] In some embodiments, the length of the low-pressure inlet waist-shaped groove is equal to the length of the high-pressure outlet waist-shaped groove, and the distance between the first oil suction hole and the second oil discharge hole is equal to the distance between the second oil suction hole and the first oil discharge hole.

[0017] In order to solve the problem that the existing hydraulic pump has an independent return oil pump built in, which leads to reduced product reliability and a significant increase in product weight, the present invention has the following advantages:

[0018] Through the technical solution of the present invention, by utilizing the structural design of the distribution plate, an oil suction and pressurization function combination is set at the hydraulic pump suction port, and an oil return and discharge function combination is set at the oil return port, and an integrated circulation distribution mechanism is established in the hydraulic pump. The low-temperature hydraulic oil sucked from the oil tank by the hydraulic pump enters the hydraulic pump housing cavity through the first oil hole, so that the low-temperature oil at the hydraulic pump inlet is mixed with the high-temperature oil inside the hydraulic pump housing cavity, thereby reducing the temperature of the hydraulic pump housing cavity, and then forcibly discharged from the oil return port, which can significantly reduce the internal oil temperature of the pump body with the highest temperature, and has a significant heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a flow distribution mechanism applied to a hydraulic pump is shown;

[0020] Figure 2 Shown Figure 1 Schematic diagram of the structure of the cutting line EE shown in FIG;

[0021] Figure 3 Shown Figure 1 A schematic diagram of the structure of the section line BB shown in FIG;

[0022] Figure 4 Shown Figure 1 Schematic diagram of the structure of the cutting line DD shown in .

[0023] Figure markings: 10-distribution plate; 11-oil suction hole; 111-first oil suction hole; 112-second oil suction hole; 12-low-pressure inlet waist-shaped groove; 121-first oil hole; 13-oil drain hole; 131-first oil drain hole; 132-second oil drain hole; 14-high-pressure outlet waist-shaped groove; 15-high-pressure bushing assembly; 151-first bushing; 152-first sealing ring; 153-first protective ring; 16-oil hole bushing assembly; 161-second bushing 162-second sealing ring; 163-second protective ring; 164-third sealing ring; 165-third protective ring; H-rotation direction of the cylinder of the hydraulic pump. DETAILED DESCRIPTION

[0024] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the present disclosure, rather than to imply any limitation on the scope of the present disclosure.

[0025] As used herein, the term "including" and its variations are to be interpreted as open-ended terms meaning "including, but not limited to." The term "based on" is to be interpreted as "based, at least in part, on." The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment." The term "another embodiment" is to be interpreted as "at least one other embodiment." Terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily intended to better describe the present application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationships. For example, the term "on" may, in certain circumstances, be used to indicate a dependency or connection relationship. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" are to be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise specified, "plurality" means two or more.

[0026] This embodiment discloses a flow distribution mechanism for a hydraulic pump, such as Figures 1 to 4 As shown, the flow distribution mechanism includes:

[0027] The valve plate 10 is provided with at least one oil suction hole 11, at least one oil discharge hole 13, a low-pressure inlet waist-shaped groove 12 and a high-pressure outlet waist-shaped groove 14 in the direction of rotation of the hydraulic pump. The oil suction hole 11 and the low-pressure inlet waist-shaped groove 12 are located in the oil suction half area of the valve plate 10, and the oil discharge hole 13 and the high-pressure outlet waist-shaped groove 14 are located in the oil discharge half area of the valve plate 10. The low-pressure inlet waist-shaped groove 12 is further connected to a first oil hole 121, and the other end of the first oil hole 121 is connected to the hydraulic pump housing cavity;

[0028] A high-pressure bushing assembly 15 is fixed to the valve plate 10 , one end of the high-pressure bushing assembly 15 is connected to the high-pressure outlet waist groove, and the other end is connected to the hydraulic pump outlet;

[0029] At least two oil hole bushing assemblies 16 are fixed to the valve plate 10 and are located on the same side of the valve plate 10 as the high-pressure bushing assembly 15, one end of one of the oil hole bushing assemblies 16 is connected to the oil suction hole 11, and the other end is connected to the hydraulic pump housing cavity, and the other end of the oil hole bushing assembly 16 is connected to the oil discharge hole 13, and the other end is connected to the oil return port of the hydraulic pump;

[0030] The cylinder of the hydraulic pump rotates around the distribution plate 10, driving the internal rotor plunger cavity of the hydraulic pump to communicate with the oil suction hole 11, the low-pressure inlet waist-shaped groove 12, the oil discharge hole 13 or the high-pressure outlet waist-shaped groove 14.

[0031] Furthermore, the axes of the oil suction hole 11, the oil discharge hole 13, the low-pressure inlet waist-shaped groove 12 and the high-pressure outlet waist-shaped groove 14 are all located on the same arc.

[0032] Furthermore, the high-pressure bushing assembly 15 includes a first bushing 151, a first accommodating groove is recessed on the distribution plate 10, and the outer wall of the first bushing 151 is provided with a first sealing ring 152 and a first protective ring 153 for cooperating and sealing with the end face of the first accommodating groove.

[0033] Furthermore, at least two of the oil hole bushing assemblies 16 include a second bushing 161, wherein the outer wall of one of the second bushings 161 is provided with a second sealing ring 162 and a second protective ring 163 for cooperating and sealing with the inner wall of the oil suction hole 11, and the outer wall of the other second bushing 161 is provided with a third sealing ring 164 and a third protective ring 165 for cooperating and sealing with the inner wall of the oil discharge hole 13.

[0034] Furthermore, the inner diameter of the first bushing 151 is greater than the inner diameter of the second bushing 161 .

[0035] Furthermore, the distribution plate 10 includes two oil suction holes 11 and two oil discharge holes 13. Along the rotation direction H of the cylinder body of the hydraulic pump, they are the first oil suction hole 111, the low-pressure inlet waist-shaped groove 12, the second oil suction hole 112, the first oil discharge hole 131, the high-pressure outlet waist-shaped groove 14 and the second oil discharge hole 132.

[0036] Furthermore, along the rotation direction H of the cylinder body of the hydraulic pump, the distance between the first oil suction hole 111 and the low-pressure inlet waist-shaped groove 12 is equal to the distance between the second oil suction hole 112 and the low-pressure inlet waist-shaped groove 12; the distance between the first oil discharge hole 131 and the high-pressure outlet waist-shaped groove 14 is equal to the distance between the second oil discharge hole 132 and the high-pressure outlet waist-shaped groove 14.

[0037] Furthermore, the length of the low-pressure inlet kidney-shaped groove 12 is equal to the length of the high-pressure outlet kidney-shaped groove 14 , and the distance between the first oil suction hole 111 and the second oil discharge hole 132 is equal to the distance between the second oil suction hole 112 and the first oil discharge hole 131 .

[0038] In this embodiment, a distribution mechanism for a hydraulic pump is disclosed. By utilizing the structural design of the distribution plate 10, an oil suction and pressurization function combination is set at the hydraulic pump suction port, and an oil return and discharge function combination is set at the oil return port. An integrated circulation distribution mechanism is established in the hydraulic pump. The low-temperature hydraulic oil sucked from the oil tank by the hydraulic pump enters the hydraulic pump housing cavity through the first oil hole 121, so that the low-temperature oil at the hydraulic pump inlet is mixed with the high-temperature oil inside the hydraulic pump housing cavity, thereby reducing the temperature of the hydraulic pump housing cavity and then forcibly discharging it from the oil return port. This can significantly reduce the internal oil temperature of the pump body with the highest temperature, and the heat dissipation effect is significant.

[0039] The flow distribution mechanism includes a distribution plate 10, a high-pressure bushing assembly 15, and an oil hole bushing assembly 16. The high-pressure bushing assembly 15 is located between the high-pressure outlet waist groove and the hydraulic pump outlet. There are four sets of oil hole bushing assemblies 16, located between the first oil suction hole 11 and the hydraulic pump housing cavity, between the second oil suction hole 11 and the hydraulic pump housing cavity, between the first oil discharge hole 13 and the hydraulic pump return port, and between the second oil discharge hole 13 and the hydraulic pump return port.

[0040] Furthermore, the distribution plate 10 includes a low-pressure inlet waist-shaped groove 12, a high-pressure outlet waist-shaped groove 14, a first oil suction hole 11, a second oil suction hole 11, a first oil discharge hole 13 and a second oil discharge hole 13. According to the rotation direction of the hydraulic pump, they are the first oil suction hole 11, the low-pressure inlet waist-shaped groove 12, the second oil suction hole 11, the first oil discharge hole 13, the high-pressure outlet waist-shaped groove 14 and the second oil discharge hole 13 in sequence. The first oil suction hole 11, the low-pressure inlet waist-shaped groove 12 and the second oil suction hole 11 are all located in the oil suction half of the distribution plate 10, and the first oil discharge hole 13, the high-pressure outlet waist-shaped groove 14 and the second oil discharge hole 13 are located in the oil discharge half of the distribution plate 10. In the present application, it is preferred that the axes of the two oil suction holes 11, the two oil discharge holes 13, the low-pressure inlet waist-shaped groove 12 and the high-pressure outlet waist-shaped groove 14 are all located on the same arc.

[0041] Furthermore, the high-pressure bushing assembly 15 includes a first sealing ring 152, a first protective ring 153 and a first bushing 151. The first sealing ring 152 and the first protective ring 153 are used for oil sealing. The first bushing 151 is used to provide an oil passage. Among them, the high-pressure bushing assembly 15 is also equipped with a first sealing ring 152 and a first protective ring 153 at the outlet of the hydraulic pump. The outlet of the hydraulic pump is arranged on the housing of the hydraulic pump, and a cavity is formed inside the housing. The distribution mechanism is fixed in the cavity of the housing and is arranged to rotate relative to the cylinder body of the hydraulic pump. In the present application, the two sets of first sealing rings 152 and first protective rings 153 are assembled in a mirror image, and the first protective ring 153 is assembled on the inner side.

[0042] Furthermore, the oil hole bushing assembly 16 includes a sealing ring, a protective ring, and a second bushing 161. The second sealing ring 162 and the second protective ring 163 are used for oil sealing. The second bushing 161 is used to provide an oil passage. There are four oil hole bushing assemblies 16, each corresponding to an oil suction hole 11 or an oil discharge hole 13. The second bushing 161 seals the inner side wall of the oil suction hole 11 with the second sealing ring 162 and the second protective ring 163, and the second bushing 161 seals the inner side wall of the oil discharge hole 13 with the third sealing ring 164 and the third protective ring 165. The oil hole bushing assembly 16 that cooperates with the oil suction hole 11 is also provided with a second sealing ring 162 and a second protective ring 163 in conjunction with the hydraulic pump housing cavity, and the oil hole bushing assembly 16 that cooperates with the oil discharge hole 13 is also provided with a third sealing ring 164 and a third protective ring 165 in conjunction with the hydraulic pump return port. In this application, the two sets of sealing rings and protective rings are assembled in a mirror image within the same oil hole bushing assembly 16, with the first protective ring 153 assembled on the inside. In this application, the inner diameter of the oil suction hole 11 is preferably the same as the inner diameter of the oil discharge hole 13, and the outer diameter is also the same. Therefore, the dimensions of the second sealing ring 162 and the second protective ring 163 can also be selected to be the same as the third sealing ring 164 and the third protective ring 165.

[0043] Furthermore, since the flow rate passing through the first bushing 151 is greater than that of the second bushing 161 , the diameter of the oil path provided inside the first bushing 151 is larger than that of the second bushing 161 , and thus the inner diameter of the first bushing 151 is greater than that of the second bushing 161 .

[0044] Furthermore, the oil at the inlet of the hydraulic pump enters the rotor plunger cavity inside the hydraulic pump (i.e., the plunger assembly located in the cylinder body) through the low-pressure inlet waist-shaped groove 12, realizing the function of the hydraulic pump to suck oil from the inlet, and enters the hydraulic pump housing cavity (i.e., located inside the housing, i.e., between the housing surface and the cavity) through the first oil hole 121, so that the low-temperature oil at the inlet of the hydraulic pump is mixed with the high-temperature oil inside the hydraulic pump housing cavity, thereby reducing the oil temperature in the hydraulic pump housing cavity.

[0045] Furthermore, when the hydraulic pump cylinder body rotates in communication with the first oil suction hole 11, the oil in the hydraulic pump housing cavity enters the rotor plunger cavity inside the hydraulic pump through the internal oil passage of the second bushing 161 and the first oil suction hole 11, pushing the plunger assembly forward. When the hydraulic pump cylinder body rotates in communication with the low-pressure inlet waist-shaped groove 12, the oil at the hydraulic pump inlet is drawn into the rotor plunger cavity inside the hydraulic pump, further pushing the plunger assembly forward. When the hydraulic pump cylinder body rotates in communication with the second oil suction hole 11, the oil in the hydraulic pump housing cavity enters the rotor plunger cavity inside the hydraulic pump through the internal oil passage of the second bushing 161 and the second oil suction hole 11, further pushing the plunger assembly forward. As the hydraulic pump cylinder body rotates through the entire suction half of the valve plate 10, the low-temperature inlet oil of the hydraulic pump and the high-temperature oil in the hydraulic pump housing cavity mix and fully intermingle within the rotor plunger cavity, thereby carrying a large amount of the high-temperature oil in the hydraulic pump housing cavity.

[0046] Furthermore, when the cylinder body of the hydraulic pump communicates with the first oil drain hole 13 along with the rotation direction, the oil in the rotor plunger cavity inside the hydraulic pump enters the oil return port of the hydraulic pump through the first oil drain hole 13 and the internal oil passage of the second bushing 161, causing the plunger assembly to move backward. When the cylinder body of the hydraulic pump communicates with the high-pressure outlet waist-shaped groove 14 along with the rotation direction, the oil in the rotor plunger cavity inside the hydraulic pump is discharged to the hydraulic pump outlet through the internal oil passage of the first bushing 151, continuing to cause the plunger assembly to move backward. When the cylinder body of the hydraulic pump communicates with the second oil drain hole 13 along with the rotation direction, the oil in the rotor plunger cavity inside the hydraulic pump enters the oil return port of the hydraulic pump through the second oil drain hole 13 and the internal oil passage of the second bushing 161, causing the plunger assembly to move to its initial position. When the cylinder of the hydraulic pump rotates through the entire oil discharge half area of the distribution plate 10, the rotor plunger cavity inside the hydraulic pump carries a large amount of high-temperature oil from the hydraulic pump housing cavity and is discharged to the hydraulic pump outlet and return oil port, forcing the heat inside the hydraulic pump to the outside of the hydraulic pump, which can be dissipated by the heat dissipation device set in the hydraulic system.

[0047] In some embodiments, the number of the oil suction hole 11 and the oil discharge hole 13 and the corresponding oil hole bushing assembly 16 can be one or two, preferably determined by the required discharge flow rate of the return oil forced discharge function and the required heat dissipation capacity of the hydraulic pump. However, the number of the oil suction hole 11 and the oil discharge hole 13 is the same.

[0048] Furthermore, along the rotation direction H of the cylinder body of the hydraulic pump, the distance between the first oil suction hole 111 and the low-pressure inlet kidney-shaped groove 12 is equal to the distance between the second oil suction hole 112 and the low-pressure inlet kidney-shaped groove 12; the distance between the first oil discharge hole 131 and the high-pressure outlet kidney-shaped groove 14 is equal to the distance between the second oil discharge hole 132 and the high-pressure outlet kidney-shaped groove 14; the length of the low-pressure inlet kidney-shaped groove 12 is equal to the length of the high-pressure outlet kidney-shaped groove 14, and the distance between the first oil suction hole 111 and the second oil discharge hole 132 is equal to the distance between the second oil suction hole 112 and the first oil discharge hole 131. In the present application, the above-mentioned structural design is adopted to facilitate the precise control of the position of the piston assembly in the hydraulic pump, thereby improving the efficiency of the flow distribution mechanism applied to the hydraulic pump.

[0049] In summary, through the above-mentioned structural setting, the present invention sets an oil suction and pressurization function combination at the hydraulic pump suction port, and sets an oil return and discharge function combination at the oil return port, and forms an integrated circulation distribution mechanism in the hydraulic pump. By sucking the low-temperature hydraulic oil from the oil tank into the hydraulic pump housing cavity through the first oil hole, the low-temperature oil at the hydraulic pump inlet is mixed with the high-temperature oil inside the hydraulic pump housing cavity, thereby reducing the temperature of the hydraulic pump housing cavity, and then forcibly discharging it from the oil return port, which can significantly reduce the internal oil temperature of the pump body with the highest temperature, and has a significant heat dissipation effect. In addition, the distribution mechanism is an integrated integrated structure with a compact structure, small size, and light weight. It integrates the functions of fastening, sealing, transmission, oil self-pressurization, oil self-circulation, and return oil forced discharge. It conforms to the requirements of aerospace hydraulic pumps for high-reliability integrated design and weight reduction of hydraulic pumps, and has broad market prospects.

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0051] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A flow distribution mechanism applied to a hydraulic pump, characterized in that: include: A distribution plate, wherein the distribution plate is provided with at least one oil suction hole, at least one oil discharge hole, a low-pressure inlet waist-shaped groove, and a high-pressure outlet waist-shaped groove. The oil suction hole and the low-pressure inlet waist-shaped groove are located in the oil suction half area of the distribution plate, and the oil discharge hole and the high-pressure outlet waist-shaped groove are located in the oil discharge half area of the distribution plate. A first oil hole is further connected to the low-pressure inlet waist-shaped groove, and the other end of the first oil hole is connected to the hydraulic pump housing cavity. A high-pressure bushing assembly is fixed on the valve plate, one end of the high-pressure bushing assembly is connected to the high-pressure outlet waist groove, and the other end is connected to the hydraulic pump outlet; At least two oil hole bushing assemblies are fixed to the valve plate and are located on the same side of the valve plate as the high-pressure bushing assembly, one end of one of the oil hole bushing assemblies is connected to the oil suction hole and the other end is connected to the hydraulic pump housing cavity, and one end of the other oil hole bushing assembly is connected to the oil discharge hole and the other end is connected to the oil return port of the hydraulic pump; The cylinder of the hydraulic pump rotates around the distribution plate, driving the internal rotor plunger cavity of the hydraulic pump to communicate with the oil suction hole, low-pressure inlet waist-shaped groove, oil discharge hole or high-pressure outlet waist-shaped groove.

2. The flow distribution mechanism for a hydraulic pump according to claim 1, wherein: The axes of the oil suction hole, the oil discharge hole, the low-pressure inlet waist-shaped groove and the high-pressure outlet waist-shaped groove are all located on the same arc.

3. The flow distribution mechanism for a hydraulic pump according to claim 1, wherein: The high-pressure bushing assembly includes a first bushing, a first accommodating groove is recessed on the distribution plate, and the outer side wall of the first bushing is provided with a first sealing ring and a first protective ring for cooperating and sealing with the end face of the first accommodating groove.

4. The flow distribution mechanism for a hydraulic pump according to claim 3, wherein: At least two of the oil hole bushing assemblies include a second bushing, wherein the outer wall of one of the second bushings is provided with a second sealing ring and a second protective ring for cooperating and sealing with the inner wall of the oil suction hole, and the outer wall of the other second bushing is provided with a third sealing ring and a third protective ring for cooperating and sealing with the inner wall of the oil discharge hole.

5. The flow distribution mechanism for a hydraulic pump according to claim 4, characterized in that: An inner diameter of the first bushing is greater than an inner diameter of the second bushing.

6. The flow distribution mechanism for a hydraulic pump according to claim 1 or 2, characterized in that: The distribution plate includes two oil suction holes and two oil discharge holes. Along the rotation direction of the cylinder body of the hydraulic pump, they are the first oil suction hole, the low-pressure inlet waist-shaped groove, the second oil suction hole, the first oil discharge hole, the high-pressure outlet waist-shaped groove and the second oil discharge hole.

7. The flow distribution mechanism for a hydraulic pump according to claim 6, characterized in that: Along the rotation direction of the cylinder body of the hydraulic pump, the distance between the first oil suction hole and the low-pressure inlet waist-shaped groove is equal to the distance between the second oil suction hole and the low-pressure inlet waist-shaped groove; the distance between the first oil discharge hole and the high-pressure outlet waist-shaped groove is equal to the distance between the second oil discharge hole and the high-pressure outlet waist-shaped groove.

8. The flow distribution mechanism for a hydraulic pump according to claim 7, characterized in that: The length of the low-pressure inlet waist-shaped groove is equal to the length of the high-pressure outlet waist-shaped groove, and the distance between the first oil suction hole and the second oil discharge hole is equal to the distance between the second oil suction hole and the first oil discharge hole.

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