Cross torque transmission structure for piston pump and piston pump having the same

Abstract

The present invention provides a cross torque transmission structure for a piston pump and a piston pump having the same, comprising an input transmission shaft, a first transmission block, a second transmission block, a first transmission shaft, and a second transmission shaft connected in sequence, wherein the two end surfaces of the first transmission block have orthogonally distributed slide grooves a and b; the two end surfaces of the second transmission block have orthogonally distributed slide grooves c and d; one end of the input transmission shaft is a power input end, and the other end is a flat square structure c, which matches the slide groove a; the first transmission shaft is circumferentially uniformly provided with a plurality of linear ball grooves parallel to the axis, which match the linear ball grooves of the upper piston structure of the piston pump; the two ends of the first transmission shaft are also respectively provided with flat square structures a and b, which match the slide grooves b and c respectively; the second transmission shaft is circumferentially uniformly provided with a plurality of linear ball grooves parallel to the axis, which match the linear ball grooves of the lower piston structure of the piston pump; one end of the second transmission shaft is also provided with a flat square structure d, which matches the slide groove d.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid machinery and relates to a cross torque transmission structure for a piston pump and a piston pump having the same. Background Art

[0002] The dual-motion freedom piston pump integrates the shaft and piston into an integrated design, and uses the dual-motion freedom principle of the piston "circumferential rotation + axial reciprocating" to achieve continuous oil suction and discharge, eliminating the valve plate structure of the traditional piston pump. At the same time, a symmetrical cam roller structure is used to replace the sliding shoe inclined plate structure, transforming the original sliding friction pair into rolling friction, and the symmetrical force structure makes the piston have no lateral force, eliminating the two friction pairs of the piston and cylinder body, and the cylinder body and the valve plate, so the pump efficiency is higher, and it also breaks through the constraints of the sliding friction pair on the pump performance and other aspects.

[0003] In order to realize the dual-degree-of-freedom motion of the piston, namely "circumferential rotation + axial reciprocating", the torque transmission structure of the piston pump is crucial. In the existing dual-degree-of-freedom motion piston pump torque transmission structure, there are mainly the following problems: 1. The fork roller torque transmission structure is large in size and weight, and occupies the axial space of the piston pump. As the power of the piston pump increases, the volume and weight of the piston pump increases, and the axial length of the pump changes greatly; 2. The fork roller torque transmission structure is heavy, the moment of inertia of the pump core is large, the start-stop performance of the piston pump is poor, and the control performance of the piston pump is poor; 3. The fork roller torque transmission structure will drive the oil to rotate and cause oil stirring loss. Especially under high-speed conditions, the oil stirring loss of the torque transmission structure is huge; 4. The through-shaft plus ball torque transmission structure has extremely high requirements on the coaxiality of the through-shaft and the upper / lower pump core, which increases the processability and processing time cost of processing and assembly.

[0004] Patent 202010894767.9 discloses a fork-roller torque transmission structure and a dual-motion freedom piston pump with the structure. The structure uses a pair of forks and rollers to link together. The forks and rollers are distributed on the outward side of the piston, which increases the axial length of the pump. At the same time, the fork-roller torque transmission structure rotates with the rotation of the piston, increasing the oil stirring loss. The fork-roller torque transmission structure is large in size and weight, which increases the rotational inertia of the pump core and reduces the start-stop performance and control performance of the pump. Patent 202111544343.0 discloses a piston structure and a dual-motion freedom piston pump, in which the transmission shaft in the pump has two sets of linear ball grooves parallel to the axis along the axial direction, and balls are arranged in the linear ball grooves. The input torque is transmitted through the transmission shaft, linear ball grooves, balls and pistons. However, the torque transmission structure cannot well guarantee the coaxiality of the shaft and the upper / lower pump core. If the transmission shaft and the upper / lower pump core are not coaxial enough during the processing and assembly process, the pump will be difficult to operate stably at high speed. The torque transmission structure disclosed in the above patent and the dual-motion freedom piston pump containing the structure have problems such as large volume and weight, large axial size, low mechanical efficiency and high processing precision requirements, which are not conducive to the stable operation of the pump under high-speed conditions. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0006] To this end, the present invention provides a cross torque transmission structure for a piston pump and a piston pump having the same.

[0007] The technical solution of the present invention is:

[0008] According to one aspect, a cross torque transmission structure for a piston pump is provided, the cross torque transmission structure comprising an input transmission shaft, a first transmission block, a first transmission shaft, a second transmission block and a second transmission shaft connected in sequence, wherein:

[0009] The two end surfaces of the first transmission block have orthogonally distributed slide grooves a and slide grooves b; the two end surfaces of the second transmission block have orthogonally distributed slide grooves c and slide grooves d;

[0010] One end of the input transmission shaft is the power input end, and the other end is a flat square structure c, which matches the slide groove a;

[0011] The first transmission shaft is evenly distributed with a plurality of linear ball grooves parallel to the axis in the circumferential direction, which are used to place balls and match with the linear ball grooves of the upper piston structure of the piston pump; the two ends of the first transmission shaft are also provided with flat square structures a and flat square structures b, which match with the slide groove b and the slide groove c respectively;

[0012] The second transmission shaft is evenly distributed with a plurality of linear ball grooves parallel to the axis in the circumferential direction, which are used to place balls and match with the linear ball grooves of the lower piston structure of the piston pump; a flat square structure d is also provided at one end of the second transmission shaft, which matches with the slide groove d;

[0013] Among them, any slide groove has multiple inner wall surfaces, some of the multiple inner wall surfaces are set as transmission surfaces, and the remaining parts are set as non-transmission surfaces. The transmission surfaces of the two end surface slide grooves on the same transmission block are perpendicular to each other. The flat square structure a, flat square structure b, flat square structure c and flat square structure d all have transmission surfaces and non-transmission surfaces that match the corresponding slide grooves. The transmission surface of any flat square structure fits tightly with the transmission surface of the corresponding slide groove, and there is a gap between the non-transmission surface of any flat square structure and the non-transmission surface of the corresponding slide groove. During operation, the input transmission shaft and the first transmission shaft can slide along the normal direction of the non-transmission surface while transmitting torque through the transmission surface, and the first transmission shaft and the second transmission shaft can also slide along the normal direction of the non-transmission surface while transmitting torque through their transmission surfaces.

[0014] Furthermore, any slide groove is a rectangular groove.

[0015] Furthermore, one group of two inner wall surfaces of the rectangular groove that are arranged parallel to each other are set as transmission surfaces, and the remaining two surfaces are non-transmission surfaces.

[0016] Furthermore, the length of the transmission surface is greater than the length of the non-transmission surface.

[0017] Furthermore, the cross torque transmission structure has a plurality of limit assemblies, and any linear ball groove on the first transmission shaft and the second transmission shaft corresponds to a limit assembly, and the limit assembly is arranged in the corresponding linear ball groove to limit the ball from sliding out of the linear ball groove.

[0018] Furthermore, the limiting assembly is composed of a first limiting member and a second limiting member, the first limiting member and the second limiting member are respectively arranged in the corresponding linear ball groove at intervals, and a plurality of balls are also arranged between the first limiting member and the second limiting member.

[0019] Furthermore, any of the linear ball grooves is not fully filled with balls, and the length of the linear ball groove without balls is ΔL, ΔL=h / π, wherein h is the guide rail stroke of the piston pump.

[0020] Furthermore, the length of any linear ball groove is L:

[0021] L=nD+h / π

[0022] Where L is the length of the linear ball groove, D is the ball diameter, n is the number of balls, and h is the guide rail stroke.

[0023] According to another aspect, a piston pump is provided, comprising the above-mentioned cross torque transmission structure.

[0024] The above technical solution transmits two shaft systems through a cross transmission block. Orthogonal slide grooves are opened on both end faces of the cross transmission block. The transmission shafts on both sides cooperate with the transmission block through a flat square with the same width as the slide groove, and the transmission surface and non-transmission surface are respectively set. Under the cooperation of the transmission surface and the non-transmission surface, when the transmission shafts on both sides are not coaxial, the transmission block can be adaptively moved and adjusted to reduce the coupling between the two. That is, the transmission shaft of the piston pump is changed from the original whole long shaft to two short shafts, and straight ball grooves are opened on the shaft respectively. The ball grooves correspond to the ball grooves of the piston. The piston is driven to rotate by the built-in balls. The transmission shaft of each pump core and the corresponding pump core can be regarded as a whole. The radial component of the transmission shaft on the plunger can be balanced under the adaptive adjustment function of the transmission block, which can avoid friction and adhesion between the piston and the copper bushing. At the same time, the structure is easy to process, and the ball groove can be processed by wire cutting, and it has better structural strength. Specifically, compared with the fork roller torque transmission structure, the cross torque transmission structure of the present invention has a small volume, and the torque transmission structure is arranged inside the piston, which does not affect the axial length of the pump; and the cross torque transmission structure of the present invention has a light weight, a short turning radius, a small moment of inertia, good start-stop performance, and good pump control performance; compared with the external fork roller torque transmission structure, the cross torque transmission structure of the present invention is distributed inside the piston, the oil stirring loss is extremely small, and it is suitable for high-speed working conditions; the cross torque transmission structure of the present invention realizes the decoupling of the upper and lower pump cores in rotational motion, reduces the coaxiality requirements of the upper and lower pump cores, reduces the processing accuracy requirements, reduces the processing costs, and improves the economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 The figure shows a schematic structural diagram of a cross torque transmission structure for a piston pump provided according to a specific embodiment of the present invention (with a piston structure);

[0027] Figure 2 for Figure 1 A cross-sectional view of

[0028] Figure 3 The figure shows a schematic structural diagram of a cross torque transmission structure for a piston pump provided according to a specific embodiment of the present invention (without a piston structure);

[0029] Figure 4A schematic diagram of a transmission surface of a transmission block provided according to a specific embodiment of the present invention is shown. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0033] like Figure 1-4As shown, in one embodiment of the present invention, a cross torque transmission structure for a piston pump is provided, which includes an input transmission shaft 11, a first transmission block 2, a first transmission shaft 3, a second transmission block 7 and a second transmission shaft 17 connected in sequence; the two end surfaces of the first transmission block 2 have orthogonally distributed slide grooves a and slide grooves b; the two end surfaces of the second transmission block 7 have orthogonally distributed slide grooves c and slide grooves d; one end of the input transmission shaft is a power input end, and the other end is a flat square structure c, which cooperates with the slide groove a; the first transmission shaft 3 is circumferentially uniformly provided with a plurality of linear ball grooves b34 parallel to the axis, which are used to place balls 15 and cooperate with the linear ball grooves of the upper piston structure 4 of the piston pump; the two ends of the first transmission shaft 3 are also respectively provided with flat square structures a and flat square structures b, which cooperate with the slide grooves b and slide grooves c respectively; the second transmission shaft 17 is circumferentially uniformly provided with a plurality of linear ball grooves c parallel to the axis 174, used for placing balls, matching with the linear ball groove of the lower piston structure 18 of the piston pump; one end of the second transmission shaft 17 is also provided with a flat square structure d, matching with the slide d; wherein, any slide has multiple inner wall surfaces, some of the multiple inner wall surfaces are set as transmission surfaces, and the remaining parts are set as non-transmission surfaces, and the transmission surfaces of the two end surface slides on the same transmission block are perpendicular to each other, and the flat square structure a, flat square structure b, flat square structure c and flat square structure d all have transmission surfaces and non-transmission surfaces matching with the corresponding slides, and the transmission surface of any flat square structure is tightly fitted with the transmission surface of the corresponding slide, and there is a gap between the non-transmission surface of any flat square structure and the non-transmission surface of the corresponding slide. During operation, the input transmission shaft 11 and the first transmission shaft 3 can slide along the normal direction of the non-transmission surface while transmitting torque through the transmission surface, and the first transmission shaft 3 and the second transmission shaft 17 can also slide along the normal direction of the non-transmission surface while transmitting torque through their transmission surfaces.

[0034] Those skilled in the art should understand that when a piston pump has an upper / lower pump core, it should correspond to an upper / lower piston structure (that is, the piston pump in this application should include an upper pump core, corresponding to the upper piston structure and the first transmission shaft, and a lower pump core, corresponding to the lower piston structure and the second transmission shaft), wherein the upper / lower piston structure of the embodiment of the present invention can directly adopt the existing structure. For example, the upper piston structure 4 and the lower piston structure 18 have multiple linear ball grooves parallel to the axis uniformly distributed circumferentially inside; the upper piston structure 4 and the lower piston structure 18 both adopt an integrated structure of a piston and a double-sided guide rail, wherein the double-sided guide rail is arranged at one end of the piston, fixedly connected to the piston, and an oil distribution groove is arranged at the other end; or the double-sided guide rail is arranged in the middle of the piston, fixedly connected to the piston, and an oil distribution groove is arranged inside the piston.

[0035] With this cross torque transmission structure, when working, the input transmission shaft and the upper transmission shaft (i.e., the first transmission shaft) can slide along the normal direction of the non-transmission surface while transmitting torque through the transmission surface, adjusting the coaxiality of the input transmission shaft and the upper transmission shaft while transmitting torque, compensating for the different axiality between the input transmission shaft and the upper transmission shaft. The upper transmission shaft and the lower transmission shaft (i.e., the second transmission shaft) can also compensate for the different axiality during processing, assembly, and operation through the cross torque transmission structure. Therefore, the first and second sets of cross torque transmission structures can reduce the coaxiality requirements of the transmission shaft and the upper / lower pump core, reduce the number of parts matching processing, improve the processability of processing and assembly, and greatly save money and time costs.

[0036] The embodiment of the present invention adopts a transmission shaft, a transmission block (designed transmission surface and non-transmission surface) and a straight groove inner ball torque transmission to replace the previous through-shaft transmission structure, and realizes the decoupling of the rotational motion of the first transmission shaft and the second transmission shaft (i.e., the upper / lower two-link transmission shaft), which can compensate for the relative displacement of the input transmission shaft, the upper link transmission shaft and the lower link transmission shaft during processing, assembly and operation, and allows larger radial and axial deviations. At the same time, the cross torque transmission structure composed of the transmission shaft and the transmission block not only has the advantages of simple structure, easy installation, zero rotation clearance, high torque, high rigidity, high sensitivity, etc., but also greatly reduces the processing cost of the previous torque transmission through-shaft.

[0037] In the embodiment of the present invention, the power input end of the input transmission shaft has a structure including but not limited to a flat square, a spline, a flat key, etc.

[0038] Specifically, if Figure 3-4 As shown, the flat square structure c has a flat square structure c transmission surface 111 and a flat square structure c non-transmission surface 112, the flat square structure a has a flat square structure a transmission surface 31 and a flat square structure a non-transmission surface 32, and the slideway b matched with the flat square structure a has a slideway b transmission surface 210 and a slideway b non-transmission surface 211, wherein the flat square structure c transmission surface 111 of the input transmission shaft 11 and the flat square structure a transmission surface 31 of the first transmission shaft 3 are respectively tightly attached to the transmission surfaces at both ends of the first transmission block 2 and are perpendicular to each other. Similarly, the flat square structure b has a flat square structure b transmission surface 33, the flat square structure d has a flat square structure d transmission surface 172 and a flat square structure d non-transmission surface 171, and the slideway d of the second transmission block 7 has a slideway d transmission surface 72 and a slideway d non-transmission surface 71. The other end of the second transmission shaft 17 is set as a smooth shaft 173.

[0039] The above configuration is applied, and the two shaft systems are driven by a cross transmission block. The two end faces of the cross transmission block are provided with orthogonal slide grooves. The transmission shafts on both sides cooperate with the transmission block through a flat square with the same width as the slide groove, and the transmission surface and the non-transmission surface are respectively provided. Under the cooperation of the transmission surface and the non-transmission surface, when the transmission shafts on both sides are not coaxial, the transmission block can be adaptively moved and adjusted to reduce the coupling between the two. That is, the transmission shaft of the piston pump is changed from the original whole long shaft to two short shafts, and straight ball grooves are respectively provided on the shafts, and the ball grooves correspond to the ball grooves of the piston. The piston is driven to rotate by the built-in balls. The transmission shaft of each pump core and the corresponding pump core can be regarded as a whole. The radial component of the transmission shaft on the plunger can be balanced under the adaptive adjustment function of the transmission block, and the friction and adhesion between the piston and the copper bushing can be avoided. At the same time, the structure is easy to process, and the ball groove can be processed by wire cutting, and it has better structural strength. Compared with the fork roller torque transmission structure, the cross torque transmission structure of the present invention has a small volume, and the torque transmission structure is arranged inside the piston, which does not affect the axial length of the pump; and the cross torque transmission structure of the present invention has a light weight, a short turning radius, a small moment of inertia, good start-stop performance, and good pump control performance; compared with the external fork roller torque transmission structure, the cross torque transmission structure of the present invention is distributed inside the piston, the oil stirring loss is extremely small, and it is suitable for high-speed working conditions; the cross torque transmission structure of the present invention realizes the decoupling of the upper and lower pump cores in rotational motion, reduces the coaxiality requirements of the upper and lower pump cores, reduces the processing accuracy requirements, reduces the processing costs, and improves the economic benefits.

[0040] According to an optional embodiment of the present invention, the cross torque transmission structure may include an upper piston structure 4 and a lower piston structure 18, wherein the first transmission shaft 3 is arranged in the upper piston structure 4, and the second transmission shaft 17 is arranged in the lower piston structure 18, wherein the piston structure is driven to rotate by the rotation of the transmission shaft.

[0041] In the above embodiment, if Figure 3 As shown, in order to better achieve coaxiality adjustment, any sliding groove is a rectangular groove.

[0042] Preferably, one group of two inner wall surfaces of the rectangular groove that are arranged parallel to each other are set as transmission surfaces, and the other two surfaces are non-transmission surfaces.

[0043] In the above embodiment, in order to better transmit torque and better adjust the coaxiality, the length of the transmission surface is greater than the length of the non-transmission surface.

[0044] In the above embodiment, in order to prevent the ball from escaping from the ball groove, the cross torque transmission structure has multiple limit components, and any linear ball groove on the first transmission shaft and the second transmission shaft corresponds to a limit component. The limit component is arranged in the corresponding linear ball groove to limit the ball from sliding out of the linear ball groove.

[0045] According to one embodiment of the present invention, the limit assembly consists of a first limit member and a second limit member, the first limit member and the second limit member are respectively arranged in the corresponding linear ball groove at intervals, and a plurality of balls are also arranged between the first limit member and the second limit member.

[0046] According to a specific embodiment of the present invention, the first limiting member and the second limiting member are both pins 14 .

[0047] It can be seen that the two sets of ball grooves on the first transmission shaft and the second transmission shaft of the embodiment of the present invention correspond to the ball grooves of the upper piston structure and the inner hole of the upper piston structure respectively, and balls are placed in the ball grooves of the transmission shaft, and the ball limit pins are used to limit the balls. The first transmission shaft and the second transmission shaft drive the upper piston structure and the upper piston structure to rotate through the balls, and the piston structure reciprocates axially under the guidance of the guide rail curved surface. In addition, when the upper end cover and the lower end cover of the piston pump are connected, the transmission assembly of the embodiment of the present invention can be provided with two thrust bearings at the upper end cover and the lower cover plate to balance the hydraulic pressure of the transmission assembly.

[0048] Furthermore, each group of linear ball grooves is evenly distributed in the circumferential direction of the corresponding transmission shaft, and all the linear ball grooves have the same length and depth.

[0049] Preferably, any of the linear ball grooves is not filled with balls, and the length of the linear ball groove without balls is ΔL=h / π, where h is the guide rail stroke. Further preferably, the length of the linear ball groove 34 and the linear ball groove 174 is L=nD+h / π, where D is the ball diameter, and n is the number of balls. The number of balls is determined based on the load-bearing capacity of the balls and the torque to be transmitted, and the specific setting is a well-known technology in the art.

[0050] Since the balls in the linear ball groove are not fully distributed in the groove, and the initial positions of the balls on each groove are inconsistent, the balls will generate a tilting torque on the transmission shaft and the guide piston. This torque can be balanced by the upper bushing, pump core support frame and lower bushing of the piston pump.

[0051] Furthermore, the first transmission shaft and the second transmission shaft and their linear ball grooves, the ball grooves in the upper piston structure and the lower piston structure, the flow distribution grooves and the profiles are all completed by one-time clamping. The linear ball grooves in the linear ball grooves of the transmission shaft and the linear ball grooves in the piston structure are matched without clearance, which can not only ensure that the instantaneous flow of the upper / lower pump core is always constant, but also can well eliminate the flow pulsation and pressure pulsation of the pump.

[0052] According to another embodiment, a piston pump is also provided, wherein the piston pump includes the above-mentioned cross torque transmission structure.

[0053] That is, the key point of the embodiment of the present invention is the design of the cross torque transmission structure. As for the remaining structure of the piston pump, the existing technology can be used. The embodiment of the present invention ensures the long-term working stability of the piston pump by designing a special cross torque transmission structure.

[0054] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0055] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0056] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cross torque transmission structure for a piston pump, characterized in that: The cross torque transmission structure comprises an input transmission shaft, a first transmission block, a first transmission shaft, a second transmission block and a second transmission shaft which are connected in sequence, wherein: The center positions of both end surfaces of the first transmission block are respectively provided with orthogonally distributed slide grooves a and slide grooves b; the center positions of both end surfaces of the second transmission block are respectively provided with orthogonally distributed slide grooves c and slide grooves d; One end of the input transmission shaft is the power input end, and the other end is a flat square structure c, which matches the slide groove a; The first transmission shaft is evenly distributed with a plurality of linear ball grooves parallel to the axis in the circumferential direction, which are used to place balls and match with the linear ball grooves of the upper piston structure of the piston pump; the two ends of the first transmission shaft are also provided with flat square structures a and flat square structures b, which match with the slide groove b and the slide groove c respectively; The second transmission shaft is evenly distributed with a plurality of linear ball grooves parallel to the axis in the circumferential direction, which are used to place balls and match with the linear ball grooves of the lower piston structure of the piston pump; a flat square structure d is also provided at one end of the second transmission shaft, which matches with the slide groove d; Among them, any slide groove has multiple inner wall surfaces, some of the multiple inner wall surfaces are set as transmission surfaces, and the remaining parts are set as non-transmission surfaces. The transmission surfaces of the two end surface slide grooves on the same transmission block are perpendicular to each other. The flat square structure a, flat square structure b, flat square structure c and flat square structure d all have transmission surfaces and non-transmission surfaces that match the corresponding slide grooves. The transmission surface of any flat square structure fits tightly with the transmission surface of the corresponding slide groove, and there is a gap between the non-transmission surface of any flat square structure and the non-transmission surface of the corresponding slide groove. When working, the input transmission shaft and the first transmission shaft can slide along the normal direction of the non-transmission surface while transmitting torque through the transmission surface, and the first transmission shaft and the second transmission shaft can also slide along the normal direction of the non-transmission surface while transmitting torque through their transmission surfaces; Any chute is a rectangular chute; One group of two inner wall surfaces of the rectangular groove that are arranged parallel to each other are set as transmission surfaces, and the other two surfaces are non-transmission surfaces; the length of the transmission surface is greater than the length of the non-transmission surface.

2. A cross torque transmission structure for a piston pump according to claim 1, characterized in that: The cross torque transmission structure has a plurality of limit assemblies, and any linear ball groove on the first transmission shaft and the second transmission shaft corresponds to a limit assembly, and the limit assembly is arranged in the corresponding linear ball groove to limit the ball from sliding out of the linear ball groove.

3. A cross torque transmission structure for a piston pump according to claim 2, characterized in that: The limiting assembly is composed of a first limiting member and a second limiting member. The first limiting member and the second limiting member are respectively arranged in the corresponding linear ball groove at intervals, and a plurality of balls are also arranged between the first limiting member and the second limiting member.

4. A cross torque transmission structure for a piston pump according to claim 2 or 3, characterized in that: Any of the linear ball grooves is not fully filled with balls, and the length of the linear ball groove without balls is ΔL, ΔL=h / π, where h is the guide rail stroke of the piston pump.

5. A cross torque transmission structure for a piston pump according to claim 4, characterized in that: The length of any linear ball groove is L: L=nD+h / π Where L is the length of the linear ball groove, D is the ball diameter, n is the number of balls, and h is the guide rail stroke.

6. A piston pump, characterized in that: The piston pump comprises the cross torque transmission structure as described in any one of claims 1-5.

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