CN-122014552-A - Piston pump core with double degrees of freedom of movement and piston pump

CN122014552ACN 122014552 ACN122014552 ACN 122014552ACN-122014552-A

Abstract

The invention provides a double-freedom-degree piston pump core and a piston pump, which comprise a transmission mechanism, an upper connecting bush, a cylinder body, a lower connecting bush and small rollers, wherein the transmission mechanism comprises a transmission shaft, balls, an upper connecting piston guide rail and a lower connecting piston guide rail, one end of the transmission shaft is provided with an external spline and a motor spindle for connection, four rows of V-shaped grooves are formed in the middle of the transmission shaft, the transmission shaft comprises two rows of V-shaped grooves close to an external spline end and two rows of V-shaped grooves far away from the external spline end, the balls in the two rows of V-shaped grooves close to the external spline end are matched with the upper connecting piston guide rail, the balls in the two rows of V-shaped grooves far away from the external spline end are matched with the lower connecting piston guide rail, a double-sided cam is arranged in the middle of the piston guide rail and is matched with the small rollers on two sides to realize rotation and reciprocating motion, U-shaped grooves are respectively matched with the upper connecting bush and the cylinder body to form a closed cavity, the reciprocating motion of the piston changes the volume of the closed cavity so as to realize oil sucking and discharging, and the U-shaped grooves at two ends of the upper connecting piston guide rail are radially provided with an oil distributing port respectively to realize oil distributing function.

Inventors

WANG LINGFENG
GUO MING
SUN ZHIXIN
PAN CHENGJIAN
ZHANG ZHENYAN
LU WANG
WANG SIXING
SUN JIANBO

Assignees

北京空天技术研究所

Dates

Publication Date: 20260512
Application Date: 20251230

Claims (10)

1. A piston pump core with double degrees of freedom is characterized by comprising a transmission mechanism, an upper connecting bush, a cylinder body, a lower connecting bush and small rollers, wherein the transmission mechanism comprises a transmission shaft, balls, an upper connecting piston guide rail and a lower connecting piston guide rail, one end of the transmission shaft is provided with an external spline and connected with a motor spindle, four rows of V-shaped grooves are formed in the middle of the transmission shaft, the two rows of V-shaped grooves close to an external spline end and the two rows of V-shaped grooves far away from the external spline end are matched with the upper connecting piston guide rail, the balls in the two rows of V-shaped grooves close to the external spline end are matched with the lower connecting piston guide rail, a double-sided cam is arranged in the middle of the piston guide rail and matched with the small rollers on two sides respectively to realize rotation and reciprocating motion, U-shaped grooves are formed in two ends of the upper connecting piston guide rail and matched with the upper connecting bush and the cylinder body respectively to form a closed cavity, the reciprocating motion of a piston enables the volume of the closed cavity to change, the U-shaped grooves at two ends of the upper connecting piston guide rail are radially provided with oil distributing ports and matched with the oil distributing ports on the upper connecting bush and the two rows of V-shaped grooves far away from the external spline end, the upper connecting piston guide rail and the oil distributing ports on the upper connecting piston guide rail are matched with the upper connecting piston guide rail, the two oil distributing ports and the piston guide rail are matched with the upper connecting piston guide rail and the piston guide rail, the piston guide rail and the piston is 45-down in the piston is arranged.
2. A dual freedom of movement piston pump as claimed in claim 1, wherein the pair of V-grooves remote from the male spline end are at 90 ° to the pair of V-grooves on the side of the male spline.
3. The pump core of the piston pump with double degrees of freedom of movement according to claim 2, wherein the inner hole of the piston guide rail is provided with two symmetrical V-shaped through grooves which are respectively matched with balls in the V-shaped grooves of the transmission shaft, so that torque transmission is realized.
4. A dual freedom of movement piston pump as claimed in claim 2 or claim 3, wherein each V-groove is provided with a stop hole at each end for receiving a stop pin to limit the limit position of the ball.
5. The dual freedom degree piston pump core of any one of claims 1 to 4, wherein the piston pump core further comprises a cylinder support and a small roller support, wherein a cylinder mounting hole is formed in the middle of the cylinder support for mounting a cylinder, two square high-pressure ports are symmetrically formed in the radial direction for discharging high-pressure oil, two roller support mounting holes are formed in each of an upper support and a lower support at two ends for mounting four small roller supports, and a stud is arranged above each of the supports for fixing an upper connecting bushing and a lower connecting bushing.
6. The dual freedom of movement piston pump of claim 5 wherein the roller support has support mounting holes formed in its circumference, the roller support being secured to roller frame mounting holes formed in the cylinder support by roller support pins, the two roller mounting holes being adapted to mount the rollers.
7. The double-freedom-degree piston pump core of claim 5, wherein a through hole is formed in the middle of the cylinder body, an upper outer circular surface and a lower outer circular surface are respectively matched with U-shaped grooves of an upper connecting piston guide rail and a lower connecting piston guide rail to form a closed containing cavity, the largest outer circular surface is matched with a cylinder body mounting hole of a cylinder body support, a high-pressure square hole is communicated with a square high-pressure hole on the cylinder body support to output high-pressure oil to the outside, and a low-pressure distributing port formed in the piston guide rail, an upper oil distributing square hole and a lower oil distributing square hole of the cylinder body are regularly opened and closed in the rotating process of the piston guide rail, so that the flow distributing function of the pump core is realized.
8. The double-freedom-degree piston pump core according to claim 1, wherein the inner hole surface and the outer circle surface of the upper connecting bush are matched with the side surface of the U-shaped groove of the piston guide rail to form a closed containing cavity, and the end surface is provided with a waist-shaped hole communicated with a flow distribution square hole for realizing a flow distribution function through fuel oil and a regular switch of the flow distribution square hole formed in the radial direction and the flow distribution square hole formed in the piston guide rail.
9. The dual freedom of movement piston pump of claim 8 wherein the upper bushing is secured to the stud on the cylinder bracket by a mounting hole in the mounting plate.
10. A dual freedom of movement piston pump comprising a dual freedom of movement piston pump core as claimed in any one of claims 1 to 9.

Description

Piston pump core with double degrees of freedom of movement and piston pump Technical Field The invention belongs to the technical field of fluid machinery, and particularly relates to a double-freedom-degree piston pump core and a piston pump. Background A pump is an energy conversion device that converts mechanical energy into fluid pressure energy, and is typically used to output high pressure fluid. In the conventional pumps such as a common piston type pump, a vane type pump, a gear type pump and a screw type pump, the kinematic pair of the mechanical structure of the pump is mainly in a sliding friction mode in the working process, so that a large amount of friction energy loss is generated, the shape of parts is complex, and the processing cost is high. The piston pump with double degrees of freedom of movement integrally designs the shaft and the piston, realizes a continuous oil sucking and discharging function by utilizing the principle of double degrees of freedom of motion of circumferential rotation and axial reciprocation of the piston, and omits a valve plate structure of the traditional piston pump. Meanwhile, a symmetric cam roller structure is adopted to replace a slipper swashplate structure, the original sliding friction pair is changed into rolling friction, and the symmetric stress structure ensures that the piston is not stressed in the radial direction, so that two friction pairs of the piston, a cylinder body and a valve plate are omitted, the pump efficiency is higher, and the restriction of the sliding friction pair on the pump performance and the like is broken through. The vane type centrifugal pump, the gear pump and the screw pump respectively realize the oil sucking and discharging function by changing the volume of the containing cavity through the rotary motion of the vane, the gear and the screw, and the rotary motion can be directly obtained from power sources such as a motor and the like without conversion of other motion forms. The conventional plunger pump is to change the volume of the chamber to realize oil suction and discharge by the reciprocating motion of the plunger, which is converted from rotation by the swash plate shoe structure. In the process of converting rotation into reciprocating motion, the cylinder body only rotates at high speed, the sloping cam plate is fixed, and radial side tilting force generated in the process of converting rotation into reciprocating motion is supported by an oil film between the plunger and the cylinder body. The piston of the piston pump with double degrees of freedom of movement integrates rotation and reciprocating movement, and torque transmission from rotation to reciprocating movement is realized by the balls between the transmission shaft and the piston, however, excessive positioning can be caused by excessive matching points of the arc grooves and the balls, which is not beneficial to stable transmission. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a double-freedom-degree piston pump core and a piston pump. The technical scheme of the invention is as follows: according to one aspect, a dual-freedom-degree piston pump core is provided, which comprises a transmission mechanism, an upper connecting bush, a cylinder body, a lower connecting bush and small rollers, wherein the transmission mechanism comprises a transmission shaft, balls, an upper connecting piston guide rail and a lower connecting piston guide rail, one end of the transmission shaft is provided with an external spline and a motor spindle which are connected, four rows of V-shaped grooves are formed in the middle, the transmission shaft comprises two rows of V-shaped grooves close to an external spline end and two rows of V-shaped grooves far away from the external spline end, the balls in the two rows of V-shaped grooves close to the external spline end are matched with the upper connecting piston guide rail, the balls in the two rows of V-shaped grooves far away from the external spline end are matched with the lower connecting piston guide rail, a double-sided cam is arranged in the middle of the piston guide rail, the double-sided cam is respectively matched with the small rollers on two sides to realize rotation and reciprocating motion, two ends of the upper connecting piston guide rail are respectively matched with the upper connecting bush and the cylinder body to form a closed cavity, the reciprocating motion of the piston causes the volume of the closed cavity to change, thus oil sucking and discharging are realized, the U-shaped grooves at two ends of the upper connecting piston guide rail are radially provided with matching ports, the upper connecting piston guide rail and the upper connecting piston guide rail are respectively matched with the matching oil distributing ports and the piston guide rail, and the piston guide rail is