Orthogonal torque transmission structure for piston pump and piston pump with same

Abstract

The application provides a cross torque transmission structure for a piston pump and a piston pump with the same. The cross torque transmission structure comprises two transmission blocks, which are arranged one by one with upper and lower connecting pistons of the piston pump respectively. The transmission block is a hollow column structure with two open ends. A pair of inner and outer transmission grooves are evenly arranged on the inner cavity wall and the outer wall surface of the transmission block respectively. Any inner transmission groove and outer transmission groove are arranged along the length direction of the transmission block. A pair of inner transmission grooves and a pair of outer transmission grooves are arranged orthogonally. Any transmission block is arranged in the corresponding piston. The transmission groove on the outer side of the transmission block is matched with the ball in the ball groove of the structure of the corresponding piston. A transmission shaft is arranged in the two transmission blocks. A pair of shift forks are symmetrically arranged on the transmission shaft. The shift forks are also arranged along the length direction of the transmission shaft. The transmission shaft is arranged in the two transmission blocks simultaneously. The two transmission blocks are arranged along the axial direction of the transmission shaft. The inner transmission grooves of any transmission block are matched with the shift forks of the transmission shaft.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fluid machinery, and relates to a normal transmission torque structure for a piston pump and a piston pump with the same. BACKGROUND

[0002] The double-motion-degree-of-freedom piston pump integrates the shaft and the piston, and realizes continuous oil suction and discharge by using the principle of double-degree-of-freedom motion of the piston "circumferential rotation + axial reciprocation", and the structure of the traditional piston pump is omitted. Meanwhile, the symmetric cam roller structure is used to replace the sliding shoe swash plate structure, the original sliding friction pair is changed into rolling friction, and the symmetric stress structure makes the piston have no lateral force, and the two friction pairs of the piston and the cylinder and the cylinder and the distribution plate are omitted, so that the pump efficiency is higher, and the restriction of the sliding friction pair on the pump performance is broken.

[0003] In order to realize the double-degree-of-freedom motion of the piston "circumferential rotation + axial reciprocation", the transmission torque structure of the piston pump is very important, and in the existing transmission torque structure of the double-motion-degree-of-freedom piston pump, the following problems exist: 1. The yoke roller transmission torque structure is large in size and weight, and occupies the axial space of the piston pump, and with the increase of the power of the piston pump, the size and weight of the piston pump increase, and the axial length of the pump changes greatly; 2. The yoke roller transmission torque 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 yoke roller transmission torque structure drives the oil to rotate to cause oil stirring loss, especially under high speed working condition, the oil stirring loss of the transmission torque structure is huge; 4. The transmission torque structure of the through shaft plus the ball requires high coaxiality of the through shaft and the upper / lower pump core, and increases the process and assembly process and processing time cost.

[0004] Patent 202010894767.9 discloses a shift roller torque transmission structure and a double-motion freedom piston pump with the structure. The structure uses a pair of shift forks and rollers linked together. The shift forks and rollers are distributed on the outer extension side of the piston, increasing the length of the pump in the axial direction. At the same time, the shift roller torque transmission structure rotates with the rotation of the piston, increasing the oil stirring loss. The shift roller torque transmission structure has large volume and weight, increasing the rotational inertia of the pump core and reducing the start-stop performance and control performance of the pump. Patent 202111544343.0 discloses a piston structure and a double-motion freedom piston pump. In the pump, the transmission shaft has two groups of parallel linear ball grooves along the axial direction. The pump also has balls arranged in the linear ball grooves. The input torque is transmitted through the transmission shaft, the linear ball grooves, the balls, and the piston. However, the torque transmission structure cannot well ensure the coaxiality of the transmission shaft and the upper / lower associated pump core. If the transmission shaft and the upper / lower associated pump core have insufficient coaxiality during machining and assembly, the pump is difficult to operate stably at high speed. The torque transmission structure disclosed in the above patents and the double-motion freedom piston pump containing the structure have problems such as large volume and weight, large axial size, low mechanical efficiency, and high machining precision requirement, which are not conducive to stable operation of the pump at high speed. SUMMARY

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

[0006] To this end, the present application provides a normal transmission torque structure for a piston pump and a piston pump with the same.

[0007] The technical solution of the present application is as follows:

[0008] According to an aspect, a normal transmission torque structure for a piston pump is provided, which comprises:

[0009] Two transmission blocks are respectively arranged one-to-one with the upper associated piston and the lower associated piston of the piston pump. The transmission block is a hollow columnar structure with two open ends. A pair of inner transmission grooves are uniformly arranged on the inner cavity wall of the transmission block in the circumferential direction. A pair of outer transmission grooves are uniformly arranged on the outer wall surface of the transmission block 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 and the pair of outer transmission grooves are arranged orthogonally. Any transmission block is arranged in the corresponding piston. The transmission groove on the outer side of the transmission block cooperates with the ball in the ball groove of the corresponding piston structure.

[0010] A transmission shaft is arranged in the two transmission blocks. The two transmission blocks are arranged in the axial direction of the transmission shaft. The inner transmission grooves of any transmission block cooperate with the shift forks of the transmission shaft.

[0011] Wherein, during working, the transmission through shaft drives two transmission blocks to rotate, and the two transmission blocks distribute the torque to the upper and lower associated piston structures of the piston pump through the balls, so that the upper and lower associated piston structures rotate circumferentially.

[0012] Further, the orthogonal torque transmission structure further comprises a plurality of limiting portions, the two ends of any transmission block are provided with the limiting portions, the limiting portions are further fixedly sleeved on the transmission through shaft, and the limiting portions are used for limiting the movement of the two transmission blocks along the axis direction of the transmission through shaft.

[0013] Further, the two transmission blocks, the transmission through shaft and the upper and lower associated pistons of the piston pump are coaxially arranged.

[0014] Further, the transmission block is a hollow cylindrical structure with two open ends.

[0015] Further, the orthogonal torque transmission structure further comprises two pairs of blocking blocks, one pair of blocking blocks is arranged at the two ends of one transmission block and used for blocking the balls, and the other pair of blocking blocks is arranged at the two ends of the other transmission block and used for blocking the balls.

[0016] Further, the orthogonal torque transmission structure further comprises two supporting bearings, the transmission through shaft has bearing mounting columns on the two sides and a light shaft in the middle, a shift fork of the transmission through shaft is arranged on the light shaft, and the two supporting bearings are connected with the bearing mounting columns on the two sides respectively.

[0017] According to another aspect, a piston pump is provided, which comprises the above orthogonal torque transmission structure.

[0018] Further, the piston pump comprises upper and lower associated pistons which are arranged in one-to-one correspondence with the two transmission blocks respectively, and the two pistons are the same in structure and each has an inner hole, the inner hole wall is circumferentially uniformly distributed with a pair of shift forks, and the shift forks are provided with linear ball grooves which are matched with the outer transmission grooves of the corresponding transmission blocks.

[0019] Further, the upper and lower associated pistons each further comprises a cam guide rail which is arranged at one end of the piston and fixedly connected with the piston, and the other end of the piston is provided with an oil distribution groove; or the cam guide rail is arranged at the middle of the piston and fixedly connected with the piston, and the piston is internally provided with an oil distribution groove.

[0020] Further, the cam guide rail is a double-sided cam guide rail.

[0021] The technical scheme increases the transmission block between the transmission through shaft and the piston, a pair of shift forks are arranged in the inner hole of the piston, ball grooves are opened on the shift forks, a pair of shift forks are arranged on the transmission through shaft, and a transmission groove is arranged on the transmission block in the radial direction, the outer groove is matched with the ball in the shift fork groove of the piston, and the inner groove is matched with the shift fork of the transmission through shaft. When working, the transmission through shaft drives the transmission block to rotate (no relative axial movement between the two), the transmission block transmits the torque to the piston through the ball, and the piston rotates in the circumferential direction. The orthogonal torque transmission structure is adopted, the transmission through shaft and the piston are stressed in the orthogonal direction, and there is no radial component, so that the piston cannot extrude the copper bushing. Even if the transmission through shaft and the upper / lower associated piston have small-scale different shafts, the self-adaptive adjustment of the transmission block can be realized, so that the coaxiality requirement of the transmission shaft and the upper / lower pump core can be reduced, the number of part matching machining is reduced, the machining and assembly process are improved, and the money and time cost can be greatly saved.

[0022] Compared with the shift fork roller torque transmission structure, the orthogonal torque transmission structure has small volume, the torque transmission structure is arranged in the piston, does not affect the axial length of the pump, has light weight, short rotation radius, small moment of inertia, good start-stop performance, good control performance of the pump, is distributed in the piston, has very small oil stirring loss, is suitable for high-speed working conditions, realizes the decoupling of the upper and lower associated pump cores in the rotary motion, reduces the coaxiality requirement of the upper and lower associated pump cores, reduces the machining precision requirement, reduces the machining cost, and improves the economic benefit. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings included to provide a further understanding of the embodiments of the application, constitute a part of the specification, serve to illustrate the embodiments of the application, and together with the text description, explain the principles of the application. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 A structure diagram of the orthogonal torque transmission structure (with a piston structure) provided by the specific embodiment of the application is shown;

[0025] Figure 2 A sectional view of Figure 1 is shown;

[0026] Figure 3 A perspective view of Figure 1 is shown;

[0027] Figure 4 A structure diagram of the transmission through shaft provided by the specific embodiment of the application is shown;

[0028] Figure 5 A structural schematic diagram of a transmission block provided by a specific embodiment of the present application is shown. DETAILED DESCRIPTION

[0029] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0030] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0031] Unless specifically stated otherwise, the relative arrangements of the components and steps illustrated in these embodiments and the numerical expressions and values set forth herein are not limiting of the scope of the present application. It should be understood that the various parts of the drawings are not necessarily drawn to scale, and that, for the purpose of convenience and clarity, not all components can be shown in a given figure. Techniques, methods, and apparatus known to those of ordinary skill in the art can not be discussed in detail, but are to be considered as part of the specification, where appropriate. In all examples shown and discussed herein, any specific values are to be interpreted as merely illustrative of the examples, and not as a limitation thereon. Thus, other examples of the exemplary embodiments can have different values. It is noted that like numbers and letters on the figures identify like parts throughout the disclosure, and thus, once an item is defined in one figure, it is not necessary to discuss it further in connection with other figures.

[0032] As Figures 1-5As shown, in one embodiment of the present application, a cross-torque transmission structure for a piston pump is provided, which includes two transmission blocks 25, a transmission shaft 21 and a plurality of limiting portions 23. The two transmission blocks 25 are respectively arranged in one-to-one correspondence with the upper and lower associated pistons 4 and 18 of the piston pump. The transmission block 25 is a hollow columnar structure with open ends, has an inner cavity 252, and a pair of inner transmission grooves 253 are uniformly arranged on the inner cavity wall in a circumferential direction. A pair of outer transmission grooves 251 are uniformly arranged on the outer wall of the transmission block in a circumferential direction. Any inner transmission groove 253 and outer transmission groove 251 are arranged along the length direction of the transmission block 25. The pair of inner transmission grooves 253 and the pair of outer transmission grooves 251 are arranged orthogonally. The two transmission blocks 25 are respectively arranged in the upper associated piston 4 and the lower associated piston 18. The outer transmission groove 251 of the transmission block 25 is matched with the ball in the ball groove of the corresponding piston structure. The transmission shaft 21 is symmetrically provided with a pair of shift forks 211 in a circumferential direction. The shift forks 211 are arranged along the length direction of the transmission shaft 21. The transmission shaft 21 is arranged in the two transmission blocks 15. The two transmission blocks 25 are arranged in a spaced manner along the axis direction of the transmission shaft 21. The inner transmission groove 253 of any transmission block 25 is matched with the shift fork 211 of the transmission shaft. The two ends of any transmission block 25 are provided with the limiting portion 23. The limiting portion 23 is fixedly sleeved on the transmission shaft 21 (that is, the limiting portion 23 cannot move along the axis direction of the transmission shaft 21, and can rotate with the transmission shaft 21). The limiting portion 23 is used to limit the movement of the two transmission blocks 25 along the axis direction of the transmission shaft 21. During work, the transmission shaft 21 drives the two transmission blocks 25 to rotate. The two transmission blocks 25 transmit torque to the upper and lower associated pistons 4 and 18 through the balls, so that the two pistons rotate in a circumferential direction.

[0033] As known by those skilled in the art, when the piston pump has upper / lower associated pump cores, it should correspond to the upper / lower associated pistons. In the embodiment of the present application, the upper / lower associated pistons can directly adopt the existing structure. For example, the upper associated piston 4 and the lower associated piston 18 each include a cam guide. The cam guide is arranged at one end of the piston and fixedly connected with the piston. The other end of the piston is provided with an oil distribution groove. Alternatively, the cam guide is arranged at the middle of the piston and fixedly connected with the piston. The piston is internally provided with an oil distribution groove. The cam guide is a double-sided cam guide. During work, the transmission shaft drives the transmission block to rotate. The transmission block transmits torque to the guide piston through the ball, so that the guide piston rotates in a circumferential direction and reciprocates along the axial direction under the guidance of the guide surface. In this structure, the transmission shaft and the guide piston are always in a normal direction under force, and there is no radial component force. The different shaftness between the upper / lower associated pump core and the transmission shaft can be adjusted by the transmission block, which reduces the precision requirement of the machining parts, improves the process of machining and assembly, and is beneficial to long-term working stability.

[0034] In addition, in order to better cooperate with the transmission structure, preferably, the upper and lower connecting pistons each have an inner hole, and a pair of shift forks are uniformly distributed on the wall of the inner hole, and linear ball grooves are arranged on the shift forks to cooperate with the outer transmission grooves of the corresponding transmission blocks.

[0035] That is, unlike the existing transmission structure of the piston pump (the transmission through shaft directly cooperates with the rotation of the piston), the present application increases the transmission block between the piston and the transmission through shaft, and through the cooperation among the piston, the transmission block and the transmission through shaft, the decoupling of the rotation of the two connecting pump cores can be realized, the coaxiality requirement of the two connecting pump cores is greatly reduced, the transmission structure is simpler, and the problem of the eccentric wear of the piston under high speed and high pressure due to the misalignment of the series connected pump cores can be solved.

[0036] By using the above configuration, a pair of shift forks are arranged in the inner hole of the piston, ball grooves are opened on the shift forks, a pair of shift forks are arranged on the transmission through shaft, and radial orthogonal transmission grooves are arranged on the transmission block. The outer grooves cooperate with the balls in the shift fork grooves of the piston, and the inner grooves cooperate with the shift forks of the transmission through shaft. During operation, the transmission through shaft drives the rotation of the transmission block (no relative axial movement between the two), the transmission block transmits the torque to the piston through the balls, and the piston rotates circumferentially. By using the orthogonal transmission structure, the transmission through shaft and the piston are stressed in the orthogonal direction, and there is no radial component, so that the piston will not cause extrusion to the copper bushing. Even if there is a small-scale misalignment between the transmission through shaft and the upper / lower connecting piston, the self-adaptive adjustment of the transmission block can be realized, so that the coaxiality requirement of the transmission shaft and the upper / lower connecting pump core can be reduced, the number of part matching processes is reduced, the process of machining and assembly is improved, and the cost of money and time can be greatly saved. Compared with the shift fork and roller transmission structure, the orthogonal transmission structure of the present application has small size, the transmission structure is arranged in the inner hole of the piston, and the axial length of the pump is not affected. In addition, the orthogonal transmission structure of the present application has light weight, short rotation radius, small moment of inertia, good start-stop performance, and good control performance of the pump. Compared with the external shift fork and roller transmission structure, the orthogonal transmission structure of the present application is distributed in the inner hole of the piston, the oil stirring loss is extremely small, and is suitable for high-speed working conditions. The orthogonal transmission structure of the present application realizes the decoupling of the upper and lower connecting pump cores in the rotation, reduces the coaxiality requirement of the upper and lower connecting pump cores, reduces the machining precision requirement, reduces the machining cost, and improves the economic benefit.

[0037] According to an optional embodiment, the orthogonal transmission structure can include an upper connecting piston 4 and a lower connecting piston 18.

[0038] In the above embodiment, in order to ensure better transmission, the transmission block 25, the piston and the transmission through shaft 21 are coaxial.

[0039] In the above embodiment, as Figure 5As shown, 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 both ends open.

[0040] In the above embodiment, in order to prevent the ball from falling out of the ball groove, the orthogonal transmission structure further comprises two pairs of blocking blocks 24, wherein the pair of blocking blocks 24 are arranged at both ends of the transmission block for blocking the ball.

[0041] In the above embodiment, as Figure 4 As shown, in order to realize the support transmission of the transmission shaft, the transmission structure further comprises two support bearings 23, 27, and the transmission shaft is also designed as a bearing mounting column 210, 212 at both sides and a light shaft in the middle, and the light shaft in the middle protrudes a pair of shift forks 211 in the radial direction.

[0042] According to another embodiment, a piston pump is also provided, which comprises the above-mentioned orthogonal transmission structure.

[0043] That is, the main key of the embodiment of the present application is the design of the orthogonal transmission structure, and the rest of the structure of the piston pump can adopt the prior art. The embodiment of the present application ensures the long-term working stability of the piston pump by designing a special orthogonal transmission structure.

[0044] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0045] For the convenience of description, spatial relative terms such as "on", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0046] In addition, it should be noted that the use of the terms "first", "second" and the like does not denote any order, quantity, combination or the like, but is merely intended to distinguish between different parts, and therefore cannot be understood as limiting the scope of protection of the present application.

[0047] The preferred embodiments of the present application are described above, but the present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. An orthogonal torque transmission structure for a piston pump, characterized in that, The orthogonal torsion transmission structure includes: Two transmission blocks are respectively set to correspond one-to-one with the upper piston and lower piston of the piston pump. The transmission block is a hollow cylindrical structure with open ends. A pair of inner transmission channels are evenly opened circumferentially on its inner wall. A pair of outer transmission channels are evenly opened circumferentially on its outer wall. Any inner and outer transmission channels are arranged along the length of the transmission block. A pair of inner transmission channels and a pair of outer transmission channels are orthogonal. Any transmission block is set in the corresponding piston. The transmission channel on the outer side of the transmission block cooperates with the ball in the ball channel of the corresponding piston structure. The transmission block is a hollow cylindrical structure with open ends. A transmission shaft is provided, and a pair of shift forks are symmetrically arranged circumferentially on the transmission shaft. The shift forks are also arranged along the length of the transmission shaft. The transmission shaft is also arranged in two transmission blocks, which are spaced apart along the axis of the transmission shaft. The inner transmission groove of any transmission block is engaged with the shift fork of the transmission shaft. During operation, the transmission shaft drives two transmission blocks to rotate. The two transmission blocks transmit torque to the upper and lower piston structures of the piston pump through ball bearings, causing the upper and lower piston structures to rotate circumferentially. The orthogonal transmission structure also includes multiple limiting parts. Each of the two ends of any transmission block is provided with a limiting part. The limiting part is also fixedly sleeved on the transmission shaft. The limiting part is used to restrict the movement of the two transmission blocks along the axis of the transmission shaft. The orthogonal transmission structure also includes two support bearings. The transmission shaft has bearing mounting posts on both sides and an optical shaft in the middle. The shift fork of the transmission shaft is set on the optical shaft, and the two support bearings are respectively connected to the bearing mounting posts on both sides.

2. The orthogonal torque transmission structure for a piston pump according to claim 1, characterized in that, The two transmission blocks, the transmission shaft, and the upper and lower pistons of the piston pump are all arranged on the same axis.

3. The orthogonal torque transmission structure for a piston pump according to claim 1, characterized in that, The orthogonal transmission structure also includes two pairs of blocking blocks, one pair of which is respectively disposed at both ends of one of the transmission blocks to block the balls; the other pair of blocking blocks is respectively disposed at both ends of another transmission block to block the balls.

4. A piston pump, characterized in that, The piston pump includes the orthogonal torsion transmission structure as described in any one of claims 1-3.

5. A piston pump according to claim 4, characterized in that, The piston pump includes an upper piston and a lower piston, which are respectively set one-to-one with two transmission blocks. Both have the same structure and have an inner hole. A pair of shift forks are evenly distributed around the inner hole wall. The shift forks are provided with straight ball grooves that cooperate with the outer transmission grooves of the corresponding transmission blocks.

6. A piston pump according to claim 5, characterized in that, Both the upper and lower pistons include a cam guide rail, which is located at one end of the piston and fixedly connected to it, and an oil distribution groove is provided at the other end of the piston; or the cam guide rail is located in the middle of the piston and fixedly connected to it, and an oil distribution groove is provided inside the piston.

7. A piston pump according to claim 6, characterized in that, The cam guide is a double-sided cam guide.

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