Baffle type piston transmission structure and piston pump having the same

Abstract

The present invention provides a baffle-type piston transmission structure and a piston pump having the same, comprising: a first and a second baffle-type piston, both comprising a hollow cylinder with openings at both ends, a baffle and a plunger shaft, the baffle being arranged in the hollow cylinder to divide the inner cavity of the hollow cylinder into a first cavity and a second cavity along its axial direction; the baffle being passed through the plunger shaft; a plurality of water distribution ports being evenly distributed on the hollow cylinder parts corresponding to the first and second cavities; two transmission blocks being hollow cylindrical structures with openings at both ends, a pair of inner and outer transmission grooves being circumferentially evenly opened on the inner cavity wall and outer wall surface thereof, and any transmission block being arranged in the inner cavity of the corresponding plunger shaft; a transmission through-shaft being simultaneously arranged in the two transmission blocks, a pair of shift forks being circumferentially symmetrically arranged thereon, the two transmission blocks being spaced apart along the axial direction of the transmission through-shaft; the inner transmission grooves of the transmission blocks being matched with the shift forks; and a plurality of limiting parts being used to limit the movement of the two transmission blocks along the axial direction of the transmission through-shaft.

Description

Technical Field

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

[0002] The dual-motion piston pump integrates the shaft and piston into an integrated design. It utilizes the dual-motion principle of the piston's "circumferential rotation + axial reciprocating" to achieve continuous oil suction and discharge, eliminating the valve plate structure of traditional piston pumps. Furthermore, a symmetrical cam roller structure replaces the sliding shoe swash plate structure, transforming the original sliding friction pair into rolling friction. The symmetrical force-bearing structure eliminates lateral forces on the piston, eliminating the two friction pairs between the piston and cylinder block, and between the cylinder block and valve plate. This results in higher pump efficiency and overcomes the constraints of sliding friction pairs on pump performance.

[0003] In applications where water hydraulics require large flows, the existing dual-motion grooved piston pump can convert most of the mechanical energy into hydraulic energy. However, due to the piston being located inside the cylinder and rotating at high speed, the piston flow resistance is relatively large, and the centrifugal potential energy of the liquid in the piston cavity hinders the suction process of the working medium. A higher inlet pressure is required to achieve the suction of the working medium, resulting in a relatively serious hydraulic flow loss in the pump. In addition, the existing piston structure also has problems such as a small flow distribution window, a short flow distribution process time, and an excessively high flow rate of the working medium.

[0004] In addition, 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 piston pump torque transmission structure, the following problems mainly exist: 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 increase, 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.

[0005] Patent 202010894767.9 discloses a shift fork-roller torque transmission structure and a dual-motion piston pump incorporating this structure. This structure utilizes a pair of shift forks and rollers, which are integrated into a single unit. The shift forks and rollers are located on the outward-facing side of the piston, increasing the axial length of the pump. The shift fork-roller torque transmission structure rotates with the piston, increasing oil churning losses. The shift fork-roller torque transmission structure is bulky and heavy, increasing the pump core's moment of inertia and reducing the pump's start-stop and control performance. 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

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0007] To this end, the present invention provides a baffle-type piston transmission structure and a piston pump having the same.

[0008] The technical solution of the present invention is:

[0009] According to one aspect, a baffle-type piston transmission structure is provided, the baffle-type piston transmission structure comprising:

[0010] The first baffle-type piston and the second baffle-type piston have the same structure, both of which include a hollow cylinder with openings at both ends, a baffle and a plunger shaft, the baffle being arranged in the hollow cylinder and connected to the inner wall of the hollow cylinder along the circumferential direction of the inner wall of the hollow cylinder, the baffle dividing the inner cavity of the hollow cylinder into a first cavity and a second cavity along its axial direction; the baffle is passed through the plunger shaft, the plunger shaft has an inner cavity, a pair of shift forks are symmetrically arranged on the inner cavity in the circumferential direction, any of the shift forks are arranged along the length direction of the piston, a linear ball groove is opened on the shift fork, and the axes of the baffle, hollow cylinder and plunger shaft coincide with each other; a plurality of water distribution ports are evenly distributed in the circumferential direction of the hollow cylinder part a corresponding to the first cavity; a plurality of water distribution ports are also evenly distributed in the circumferential direction of the hollow cylinder part b corresponding to the second cavity;

[0011] Two transmission blocks are respectively arranged in a one-to-one correspondence with the first baffle-type piston and the second baffle-type piston. The transmission block is a hollow cylindrical structure with openings at both ends. A pair of inner transmission grooves are uniformly opened on the inner cavity wall thereof in the circumferential direction; a pair of outer transmission grooves are uniformly opened on the outer wall thereof in the circumferential direction. Any inner transmission groove and outer transmission groove are arranged along the length direction of the transmission block. The pair of inner transmission grooves are arranged orthogonally to the pair of outer transmission grooves. Any transmission block is arranged in the inner cavity of the plunger shaft of the corresponding piston, and the transmission groove on the outer side of the transmission block cooperates with the ball in the ball groove of the corresponding piston;

[0012] A transmission shaft is provided with a pair of shift forks symmetrically arranged on the transmission shaft in a circumferential direction, and the shift forks are also arranged along the length direction of the transmission shaft; the transmission shaft is simultaneously arranged in the two transmission blocks, and the two transmission blocks are spaced apart along the axis direction of the transmission shaft; the inner transmission groove of any transmission block cooperates with the shift fork of the transmission shaft;

[0013] A plurality of limiting parts, each of which is provided at both ends of any of the transmission blocks, and the limiting parts are also fixedly sleeved on the transmission shaft, and are used to limit the movement of the two transmission blocks along the axis of the transmission shaft;

[0014] During operation, the transmission shaft drives the two transmission blocks to rotate, and the two transmission blocks transmit torque to the first baffle piston and the second baffle piston of the piston pump through the balls, causing the two pistons to rotate circumferentially.

[0015] Furthermore, the first baffle piston and the second baffle piston each include a cam guide rail, and the cam guide rail is provided at one end of the corresponding plunger shaft.

[0016] Furthermore, the water distribution port on the hollow cylindrical part a extends from one end of the hollow cylindrical part a to its free end; the water distribution port on the hollow cylindrical part b extends from one end of the hollow cylindrical part b to its free end.

[0017] Furthermore, the end face of any of the water distribution ports is designed to be a beveled surface, and / or the radius of the baffle is larger than the inner diameter of the plunger shaft.

[0018] Furthermore, the baffle is a circular baffle, and the hollow cylinder is a hollow cylinder; and / or the transmission block is a hollow cylindrical structure with openings at both ends.

[0019] Furthermore, the baffle, the hollow cylinder and the plunger shaft are an integrated structure; and / or the two transmission blocks, the first baffle-type piston, the second baffle-type piston and the transmission through-shaft are coaxially arranged.

[0020] Furthermore, the transmission structure also includes two pairs of blocking blocks, one pair of blocking blocks is respectively arranged at both ends of one transmission block for blocking the balls, and the other pair of blocking blocks is respectively arranged at both ends of the other transmission block for blocking the balls.

[0021] According to another aspect, a piston pump is provided, comprising the baffle-type piston transmission structure described above.

[0022] The above technical solution designs a specific baffle-type piston and a specific torque transmission structure that cooperate with each other. For the piston structure, the overall design is large outer diameter, small inner diameter, and no inner wall (that is, a large hollow cylinder outer diameter and a small plunger shaft outer diameter, and the hollow cylinder and the plunger shaft do not contact each other). There is no longer a wall separating the high and low pressure chambers in the circumferential direction of the piston cavity, which can effectively reduce the hydraulic loss generated by the fluid in the piston cavity as the piston wall rotates; it can adapt to large flow occasions, almost eliminate the rotational motion of the working medium during the flow distribution process, reduce the kinetic energy loss of the working medium, and improve the energy conversion rate and working efficiency of the piston pump; the present invention adopts a baffle-type piston structure, so that the working medium only produces low-speed flow in the radial and axial directions, and the working medium can quickly and timely fill the piston cavity, avoiding cavitation and improving the anti-cavitation ability of the water hydraulic piston pump. For the torque transmission structure, a transmission block is added between the transmission shaft and the piston, and a transmission groove is provided on the transmission block in a radially orthogonal manner. The outer groove cooperates with the ball in the piston fork raceway, and the inner groove cooperates with the fork of the transmission shaft. During operation, the shaft drives the transmission block to rotate (there is no relative axial movement between the two), and the transmission block transmits the torque to the piston through the ball, causing the piston to rotate circumferentially. With the orthogonal torque transmission structure, the transmission shaft and the piston are subjected to forces in orthogonal directions, and there is no radial force component, which will not cause the piston to squeeze the copper bushing. Even if there is a small degree of misalignment between the transmission shaft and the upper / lower piston, it can be adaptively adjusted by the transmission block, thereby reducing the coaxiality requirements of the transmission shaft and the upper / lower pump core, reducing the number of parts matching processing, improving the processability of processing and assembly, and greatly saving money and time costs. Compared with the fork roller torque transmission structure, the transmission structure of the present invention has a small volume, and the transmission structure is arranged inside the piston, which does not affect the axial length of the pump; and the 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 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 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 processing costs, and improves economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are included to provide a further understanding of the embodiments of the present invention, constitute a part of the specification, illustrate the embodiments of the present invention, and together with the description, explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0024] Figure 1 It shows a structural schematic diagram of a baffle-type piston transmission structure provided according to a specific embodiment of the present invention;

[0025] Figure 2 A schematic structural diagram of a baffle-type piston according to a specific embodiment of the present invention is shown;

[0026] Figure 3 It shows a schematic structural diagram of a transmission through-shaft provided according to a specific embodiment of the present invention;

[0027] Figure 4 A structural schematic diagram of a transmission block provided according to a specific embodiment of the present invention is shown. DETAILED DESCRIPTION

[0028] 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 in no way 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 making creative work are within the scope of protection of the present invention.

[0029] 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values set forth in these embodiments 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 drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0031] like Figure 1-3As shown, in one embodiment of the present invention, a baffle-type piston transmission structure is provided, which includes: a first baffle-type piston 4, a second baffle-type piston 18, two transmission blocks 25, a transmission shaft 21 and a plurality of limit parts 23. The first baffle-type piston 4 and the second baffle-type piston 18 have the same structure, and both include a hollow cylinder 152 with openings at both ends, a baffle 154 and a plunger shaft 151. The baffle 154 is arranged in the hollow cylinder 152 and is connected to the inner wall of the hollow cylinder 152 along the circumferential direction of the inner wall of the hollow cylinder 152. The baffle 154 divides the inner cavity of the hollow cylinder 152 into a first cavity and a second cavity along its axial direction; the baffle 154 is passed through the plunger shaft 15 1 (that is, the plunger shaft portion is located in the hollow cylinder), the plunger shaft 151 has an inner cavity, and a pair of shift forks are symmetrically arranged along the circumference of the inner cavity wall. Any of the shift forks is arranged along the length direction of the piston, and a linear ball groove 153 is opened on the shift fork. The axis of the baffle 154, the hollow cylinder 152 and the plunger shaft 151 coincide with each other; the circumference of the hollow cylinder portion a corresponding to the first cavity is also uniformly provided with a plurality of water distribution ports; the circumference of the hollow cylinder portion b corresponding to the second cavity is also uniformly provided with a plurality of water distribution ports; two transmission blocks 25 are respectively arranged in a one-to-one correspondence with the first baffle type piston 4 and the second baffle type piston 18. The transmission block 25 is a hollow cylindrical structure with openings at both ends, having an inner cavity 252, and its inner cavity A pair of inner transmission grooves 253 are uniformly opened on the wall in the circumferential direction; a pair of outer transmission grooves 251 are uniformly opened on the outer wall surface of the transmission block in the circumferential direction, and any inner transmission groove 253 and outer transmission groove 251 are arranged along the length direction of the transmission block 25, and a pair of inner transmission grooves 253 are arranged orthogonally to a pair of outer transmission grooves 251. The two transmission blocks 25 are also respectively arranged in the inner cavity of the plunger shaft of the corresponding piston, and the transmission groove 251 on the outer side of the transmission block 25 cooperates with the ball in the ball groove of the corresponding piston; a pair of shift forks 211 are symmetrically arranged on the transmission shaft 21 in the circumferential direction, and the shift forks 211 are also arranged along the length direction of the transmission shaft 21; the transmission shaft 21 is simultaneously arranged in the two transmission blocks 15, and the two The transmission blocks 25 are arranged at intervals along the axial direction of the transmission shaft 21, and the inner transmission groove 253 of any of the transmission blocks 25 cooperates with the shift fork 211 of the transmission shaft; the limiting parts 23 are distributed at both ends of any of the transmission blocks 25, and the limiting parts 23 are also fixedly mounted on the transmission shaft 21 (that is, the limiting parts 23 cannot move along the axial direction of the transmission shaft 21, but can rotate with the transmission shaft 21), and the limiting parts 23 are used to limit the movement of the two transmission blocks 25 along the axial direction of the transmission shaft 21; wherein, during operation, the transmission shaft 21 drives the two transmission blocks 25 to rotate, and the two transmission blocks 25 transmit the torque to the first baffle piston 4 and the second baffle piston 18 through the balls, so that the two pistons rotate circumferentially.

[0032] That is, unlike the existing piston pump torque transmission structure (the transmission shaft directly cooperates with the piston for rotation), the present invention adds a transmission block between the piston and the transmission shaft. Through the cooperation between the piston, the transmission block and the transmission shaft, the decoupling of the rotational motion of the two-pump core can be achieved, which greatly reduces the coaxiality requirements of the two-pump core. The transmission structure is simpler and can solve the problem of piston eccentric wear under high speed and high pressure caused by the different axes of the series pump cores.

[0033] In this embodiment of the present invention, the hollow cylindrical portion corresponding to the first cavity is hollow cylindrical portion a, and the hollow cylindrical portion corresponding to the second cavity is hollow cylindrical portion b. The multiple water distribution ports on hollow cylindrical portion a can serve as both water inlets and water outlets. Similarly, the multiple water distribution ports on hollow cylindrical portion b can serve as both water inlets and water outlets. Therefore, in this embodiment, they are collectively referred to as water distribution ports.

[0034] It can be seen that, unlike the existing piston, this embodiment designs a new baffle-type piston structure, and the water distribution port of the piston is arranged on the hollow cylinder. Among them, those skilled in the art should understand that the water distribution port is connected with the inner cavity of the hollow cylinder. The hollow cylinder does not contact the plunger shaft under the action of the baffle, and the plunger shaft is directly passed through the baffle inside the hollow cylinder. As a result, there is no longer a wall separating the high and low pressure chambers in the circumferential direction of the piston cavity, which can effectively reduce the hydraulic loss generated by the fluid in the piston cavity when the piston wall rotates.

[0035] The above configuration eliminates the need for a circumferential wall separating the high- and low-pressure chambers within the piston cavity, effectively reducing the hydraulic losses caused by the rotation of the piston wall. The invention is adaptable to high-flow applications, virtually eliminating the rotational motion of the working medium during the flow distribution process, reducing kinetic energy loss, and improving the energy conversion rate and operating efficiency of the piston pump. The present invention utilizes a baffle-type piston structure, ensuring that the working medium only flows at low speeds in the radial and axial directions. This allows the working medium to quickly and promptly fill the piston cavity, preventing cavitation and improving the cavitation resistance of the water-hydraulic piston pump. Furthermore, a transmission block is added between the transmission shaft and the piston, a pair of shift forks are disposed within the inner bore of the piston, each with a ball groove, and a pair of shift forks are disposed on the transmission shaft. The transmission block is provided with radially orthogonal transmission grooves, with the outer grooves engaging the balls in the piston fork raceways and the inner grooves engaging the shift forks on the transmission shaft. During operation, the shaft drives the transmission block to rotate (without relative axial motion between the two), and the transmission block transmits torque to the piston via the balls, causing the piston to rotate circumferentially. By adopting the orthogonal torque transmission structure, the transmission shaft and the piston are subjected to forces in orthogonal directions, and there is no radial force component, which will prevent the piston from squeezing the copper bushing. Even if there is a small degree of misalignment between the transmission shaft and the upper / lower piston, it can be adjusted adaptively by the transmission block, thereby reducing the coaxiality requirements of the transmission shaft and the upper / lower pump core, reducing the number of parts matching processing, improving the processability of processing and assembly, and greatly saving money and time costs. Compared with the fork roller torque transmission structure, the transmission structure of the present invention is small in size, and the torque transmission structure is arranged inside the piston, which does not affect the axial length of the pump; and the transmission structure of the present invention is light in weight, has 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 transmission structure of the present invention is distributed inside the piston, with extremely small oil stirring loss, and is suitable for high-speed working conditions; the 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 processing costs, and improves economic benefits.

[0036] like Figure 2 As shown, the first baffle type piston and the second baffle type piston of the embodiment of the present invention are introduced in detail:

[0037] In the above embodiment, the first baffle piston 4 and the second baffle piston 18 also include a cam guide 3 , and the cam guide 3 is provided at one end of the plunger shaft 151 .

[0038] Specifically, the cam guide ensures that the pistons rotate and reciprocate, guided by the cam guide end surfaces. Specifically, during operation, the drive shaft rotates the transmission block, which transmits torque to the two baffle pistons via ball bearings, causing them to rotate circumferentially while simultaneously reciprocating axially, guided by the guide surface. With this structure, torque transmission is achieved by consistently orthogonal forces acting on the drive shaft and guide pistons, with no radial force component. Any misalignment between the upper and lower pump cores and the drive shaft can be adaptively adjusted by the drive block, reducing the precision requirements for machined components and improving processing and assembly processability, thus facilitating long-term operational stability.

[0039] In the above embodiment, in order to better achieve flow distribution, the water distribution port on the hollow cylindrical part a extends from one end of the hollow cylindrical part a to its free end; the water distribution port on the hollow cylindrical part b extends from one end of the hollow cylindrical part b to its free end.

[0040] That is, the depth of the water distribution port is consistent with the depth of the corresponding first cavity or second cavity.

[0041] Preferably, two water distribution ports are provided on the hollow cylindrical portion a, and two water distribution ports are further provided on the hollow cylindrical portion b, and the two pairs of water distribution ports are orthogonally arranged.

[0042] That is, the two water distribution ports on the hollow cylindrical part a constitute a pair of water distribution ports, and the two water distribution ports on the hollow cylindrical part b constitute another pair of water distribution ports. The two pairs of water distribution ports are arranged orthogonally to facilitate suction and drainage during operation.

[0043] In the above embodiments, the end surface of any of the water distribution ports is designed to be a beveled surface.

[0044] The piston water inlet end face of the embodiment of the present invention has a beveled surface design, which can effectively reduce the hydraulic loss caused by the outer diameter end face when the piston rotates, and can effectively improve the working efficiency of the large-flow dual-motion freedom water hydraulic piston pump.

[0045] In the above embodiment, in order to better reduce the hydraulic loss caused by the outer diameter end surface, the radius of the baffle 154 is larger than the inner diameter of the plunger shaft 151 .

[0046] Preferably, the baffle 154 is a circular baffle, and the hollow cylinder 152 is a hollow cylinder.

[0047] Preferably, the baffle 154 , the hollow cylinder 153 and the plunger shaft 151 are an integrated structure.

[0048] That is, the piston of the embodiment of the present invention has a design form of large outer diameter, small inner diameter, and no inner wall surface (i.e., a large outer diameter of the hollow cylinder and a small outer diameter of the plunger shaft, and the hollow cylinder and the plunger shaft do not contact each other). There is no longer a wall surface separating the high and low pressure chambers in the circumferential direction of the piston cavity. The middle cylindrical surface is the drainage surface, and there are two symmetrical pairs of water distribution ports on each side. The end faces of the water distribution ports have a beveled surface design, which can effectively reduce the hydraulic loss generated by the fluid in the piston cavity as the piston wall rotates, and almost eliminate the rotational motion of the working medium during the distribution process, reduce the kinetic energy loss of the working medium, improve the energy conversion rate and working efficiency of the piston pump, and can adapt to large flow situations. In addition, the baffle-type piston structure of the present invention can make the working medium only produce low-speed flow in the radial and axial directions, and the working medium can quickly and timely fill the piston cavity, avoiding cavitation erosion, and improving the anti-cavitation ability of the water hydraulic piston pump.

[0049] like Figure 3-4 As shown, the transmission block and the transmission shaft of the embodiment of the present invention are introduced in detail:

[0050] In the above embodiment, in order to ensure better transmission, the transmission block 25, the baffle piston and the transmission shaft 21 are coaxially arranged.

[0051] In the above embodiment, in order to ensure better cooperation between the piston, the transmission block and the transmission shaft, the transmission block 25 is a hollow cylindrical structure with two ends open.

[0052] In the above embodiment, in order to prevent the balls from escaping from the ball grooves, the transmission structure further includes a plurality of blocking blocks 24 , wherein the blocking blocks 24 are provided at both ends of the transmission block for sealing the balls.

[0053] In the above embodiment, if Figure 3 As shown, in order to realize the support transmission of the transmission shaft, the torque transmission structure also includes two support bearings 23, 27. The transmission shaft is also designed with bearing mounting columns 210, 212 on both sides and an optical axis in the middle. A pair of shift forks 211 grow radially from the middle optical axis.

[0054] According to another embodiment, a piston pump is further provided, which includes the above-mentioned baffle-type piston transmission structure.

[0055] That is, the main key point of the embodiment of the present invention is the design of the baffle-type piston transmission structure. As for the remaining structures of the piston pump, existing technologies can be adopted. The embodiment of the present invention can effectively improve the working efficiency of the large-flow dual-motion freedom water hydraulic piston pump by designing a special baffle-type piston transmission structure, while ensuring the long-term working stability of the piston pump.

[0056] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying 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 device or element 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 outline of each component itself.

[0057] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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.

[0058] 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. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0059] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A baffle-type piston transmission structure, characterized in that: The baffle type piston transmission structure includes: The first baffle-type piston and the second baffle-type piston have the same structure, both of which include a hollow cylinder with openings at both ends, a baffle and a plunger shaft, the baffle being arranged in the hollow cylinder and connected to the inner wall of the hollow cylinder along the circumferential direction of the inner wall of the hollow cylinder, the baffle dividing the inner cavity of the hollow cylinder into a first cavity and a second cavity along its axial direction; the baffle is passed through the plunger shaft, the plunger shaft has an inner cavity, a pair of shift forks are symmetrically arranged on the inner cavity in the circumferential direction, any of the shift forks are arranged along the length direction of the piston, a linear ball groove is opened on the shift fork, and the axes of the baffle, hollow cylinder and plunger shaft coincide with each other; a plurality of water distribution ports are evenly distributed in the circumferential direction of the hollow cylinder part a corresponding to the first cavity; a plurality of water distribution ports are also evenly distributed in the circumferential direction of the hollow cylinder part b corresponding to the second cavity; Two transmission blocks are respectively arranged in a one-to-one correspondence with the first baffle-type piston and the second baffle-type piston. The transmission block is a hollow cylindrical structure with openings at both ends. A pair of inner transmission grooves are uniformly opened on the inner cavity wall thereof in the circumferential direction; a pair of outer transmission grooves are uniformly opened on the outer wall thereof in the circumferential direction. Any inner transmission groove and outer transmission groove are arranged along the length direction of the transmission block. The pair of inner transmission grooves are arranged orthogonally to the pair of outer transmission grooves. Any transmission block is arranged in the inner cavity of the plunger shaft of the corresponding piston, and the transmission groove on the outer side of the transmission block cooperates with the ball in the linear ball groove of the corresponding piston; A transmission shaft is provided with a pair of shift forks symmetrically arranged on the transmission shaft in a circumferential direction, and the shift forks are also arranged along the length direction of the transmission shaft; the transmission shaft is simultaneously arranged in the two transmission blocks, and the two transmission blocks are spaced apart along the axis direction of the transmission shaft; the inner transmission groove of any transmission block cooperates with the shift fork of the transmission shaft; A plurality of limiting parts, each of which is provided at both ends of any of the transmission blocks, and the limiting parts are also fixedly sleeved on the transmission shaft, and are used to limit the movement of the two transmission blocks along the axis of the transmission shaft; During operation, the transmission shaft drives the two transmission blocks to rotate, and the two transmission blocks transmit torque to the first baffle piston and the second baffle piston of the piston pump through the balls, so that the two pistons rotate circumferentially.

2. A baffle-type piston transmission structure according to claim 1, characterized in that: The first baffle piston and the second baffle piston also include a cam guide, which is arranged at one end of the corresponding plunger shaft.

3. A baffle-type piston transmission structure according to claim 1 or 2, characterized in that: The water distribution port on the hollow cylindrical part a extends from one end of the hollow cylindrical part a to its free end; the water distribution port on the hollow cylindrical part b extends from one end of the hollow cylindrical part b to its free end.

4. The baffle-type piston transmission structure according to claim 3, characterized in that: The end face of any of the water distribution ports is designed to be a beveled surface, and / or the radius of the baffle is larger than the inner diameter of the plunger shaft.

5. The baffle-type piston transmission structure according to claim 3, characterized in that: The baffle is a circular baffle, and the hollow cylinder is a hollow cylinder; and / or the transmission block is a hollow cylindrical structure with openings at both ends.

6. A baffle-type piston transmission structure according to claim 4 or 5, characterized in that: The baffle, hollow cylinder and plunger shaft are an integrated structure; and / or the two transmission blocks, the first baffle piston, the second baffle piston and the transmission through shaft are coaxially arranged.

7. The baffle-type piston transmission structure according to claim 1, characterized in that: The transmission structure further comprises two pairs of blocking blocks, wherein one pair of blocking blocks is respectively arranged at both ends of one transmission block for blocking the balls, and the other pair of blocking blocks is respectively arranged at both ends of the other transmission block for blocking the balls.

8. A piston pump, characterized in that: The piston pump includes the baffle-type piston transmission structure according to any one of claims 1 to 7.

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