Inclined shaft type plunger motor plunger and plunger spherical hinge friction pair

Abstract

The utility model discloses an inclined shaft type plunger motor plunger which comprises a plunger body and a plunger ball head, the plunger ball head is connected to the right end of the plunger body, a plurality of sealing ring grooves are formed in the outer wall of the left end of the plunger body, and the plunger ball head is connected to the right end of the plunger body. The plunger body and the plunger ball head are sequentially provided with a damping hole, a connecting hole and a stepped hole from left to right in the axis direction, and the damping hole, the connecting hole and the stepped hole communicate with one another. An annular groove is formed in the outer wall of the middle of the plunger ball head, and a plurality of surface textures are distributed on the surface between the top of the plunger ball head and the annular groove. The utility model further discloses a plunger spherical hinge friction pair. According to the utility model, the technical problem that complete liquid lubrication cannot be formed is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to engineering hydraulic machinery technical field, especially a kind of oblique shaft type plunger motor plunger and plunger ball hinge friction pair. BACKGROUND

[0002] Oblique shaft type plunger motor is one of the key components of hydraulic system, due to its high working pressure, variable regulation easy, wide speed range and high efficiency and other advantages, is widely used in agricultural and forestry machinery, chemical industry, light textile machinery, energy industry machinery, metallurgical industry machinery, building material industry machinery, machine tool industry, and military industry, aerospace, ship and other fields, with oblique shaft type plunger motor to the high pressure, high speed, large flow direction development, motor's antifriction life prolonging problem is very urgent.

[0003] Plunger-ball socket composed of plunger ball hinge friction pair is one of the three friction pairs of oblique shaft type plunger motor. In the working process, plunger is driven by cylinder body and does reciprocating motion in cylinder body, while doing planetary rotation around cylinder body center line. Due to the existence of friction, plunger will also rotate randomly around its axis in main shaft socket, due to the existence of plunger and cylinder hole contact force, plunger will also rotate randomly around ball hinge center in main shaft socket; in addition, due to the existence of oil film gap, plunger may also exist slight swing in main shaft socket, under the action of main shaft lateral force, plunger is always in inclined state in cylinder hole. Plunger and main shaft socket are theoretically point contact, lubrication condition is more complex, lubrication condition is more severe, solid contact is very easy to occur.

[0004] According to statistics, early damage of friction pair is one of the main reasons for oblique shaft type plunger motor to be scrapped, if friction pair is not reasonably designed, plunger and main shaft socket cannot form complete liquid lubrication during high pressure and high speed operation of motor, mixed friction or even dry friction may occur between two metal walls, and then parts are damaged, in order to improve the lubrication state of plunger ball hinge friction pair, reduce friction loss and leakage, and prolong the service life of parts, reasonable structure design is needed to improve the working performance of plunger ball hinge friction pair. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of oblique shaft type plunger motor plunger and plunger ball hinge friction pair, solve the technical problem of not forming complete liquid lubrication.

[0006] Technical scheme is as follows:

[0007] The oblique shaft type plunger motor plunger comprises a plunger body, a plunger head connected to the right end of the plunger body, a plurality of sealing ring grooves arranged on the outer wall of the left end of the plunger body, and the plunger head connected to the right end of the plunger body; the plunger body and the plunger head are sequentially provided with a damping hole, a connecting hole and a stepped hole along the axial direction from left to right, and the damping hole, the connecting hole and the stepped hole are communicated; the outer wall of the middle part of the plunger head is provided with a ring groove, and a plurality of surface textures are distributed on the surface between the top of the plunger head and the ring groove.

[0008] Further, the surface texture is an elliptical pit structure.

[0009] Further, the ratio of the major axis to the minor axis of the elliptical pit structure is 2:1, the minor axis width is between 0.5-1mm, and the depth is between 10-20μm.

[0010] Further, the sealing ring groove is provided with a sealing ring.

[0011] The plunger head is installed in the main shaft socket.

[0012] Preferably, the left end of the main shaft is installed in the cylinder hole.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1. The technical scheme of the utility model does not increase parts, and only improves the lubricating performance of the plunger head socket through structural design, wherein the plunger head of the oblique shaft type plunger motor plunger is provided with an elliptical surface texture on the top surface, and the structure is simple, easy to process and low in processing cost.

[0015] 2. The oblique shaft type plunger motor plunger head top surface provided with the elliptical surface texture in the technical scheme of the utility model can store abrasive particles, and can effectively reduce the friction damage of the abrasive particles to the surface of the plunger head and the main shaft socket caused by the sliding rotation of the plunger head in the main shaft socket; at the same time, the oblique shaft type plunger motor plunger head top surface provided with the elliptical surface texture can store hydraulic oil, and a plurality of additional dynamic pressures are formed between the friction pairs, thereby optimizing the lubricating performance between the plunger head and the main shaft socket; even in the case that the damping hole is blocked and the high-pressure oil cannot reach the plunger head top stepped hole, the plurality of additional dynamic pressures formed by the elliptical surface texture storing hydraulic oil can effectively reduce the wear between the friction pairs; therefore, the plunger motor plunger provided with the elliptical surface texture can effectively ensure the good lubrication state of the friction pair between the plunger pump plunger head and the main shaft socket, improve the friction and lubricating performance of the friction pair, better disperse the heat generated by friction, prolong the service life of the plunger and the main shaft, and facilitate the normal operation of the plunger motor. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1It is the structure schematic view of the oblique shaft type plunger motor plunger of the utility model.

[0017] Figure 2 It is the sectional view of the oblique shaft type plunger motor plunger of the utility model.

[0018] Figure 3 It is the assembly drawing of the plunger ball hinge of the utility model.

[0019] In the drawing: 1-plunger body;2-seal ring groove;3-damping hole;4-plunger ball head;5-ring groove;6-stair-shaped hole;7-elliptical surface texture;8-main shaft ball socket;9-main shaft;10-cylinder hole;11-seal ring. Specific implementation

[0020] The following description fully shows the specific implementation of the utility model, so that the person skilled in the art can practice and reproduce.

[0021] As Figure 1 Shown, it is the structure schematic view of the oblique shaft type plunger motor plunger of the utility model;As Figure 2 Shown, it is the sectional view of the oblique shaft type plunger motor plunger of the utility model.

[0022] Oblique shaft type plunger motor plunger, comprising: plunger body 1, plunger ball head 4, plunger ball head 4 is connected in plunger body 1 right end, plunger body 1 left end outer wall is provided with multiple seal ring grooves 2, plunger ball head 4 is connected in plunger body 1 right end;Plunger body 1, plunger ball head 4 are opened along the axis direction from left to right and are provided with damping hole 3, connecting hole 12, stair-shaped hole 6, and damping hole 3, connecting hole 12, stair-shaped hole 6 are communicated;The outer wall of the middle part of plunger ball head 4 is provided with ring groove 5, and multiple surface textures 7 are distributed on the surface between the top of plunger ball head 4 and ring groove 5.

[0023] Surface texture 7 is elliptical pit structure, and the ratio of long axis to short axis is 2:1, the short axis width is between 0.5-1mm, and the depth is between 10-20μm.Seal ring 11 is installed in seal ring groove 2.

[0024] As Figure 3 Shown, it is the assembly drawing of the plunger ball hinge of the utility model.

[0025] Plunger ball hinge friction pair, comprising: main shaft 9, oblique shaft type plunger motor plunger, main shaft left side bottom is provided with main shaft ball socket 8, plunger ball head 4 is installed in main shaft ball socket 8.

[0026] The left end of main shaft 9 is installed in cylinder hole 10, and seal ring 11 forms sealing with cylinder hole 10.

[0027] The plunger ball head 4 is in contact with the spindle ball socket 8, and high-pressure oil flows into the top stepped hole 6 of the plunger ball head 4 through the damping hole 3, and static pressure support is formed between the spindle ball socket 8 and the spherical surface of the plunger ball head 4.

[0028] The sealing ring 11 is installed in the sealing ring groove 2 during use of the plunger, the plunger body 1 is installed in the cylinder hole 10, and the plunger ball head 4 is assembled with the spindle ball socket 8; during operation, the high-pressure oil acting force borne by the plunger body 1 is transmitted to the spindle 9 through the spindle ball socket 8, and the plunger body 1 reciprocates in the cylinder hole 10 under the reaction force of the spindle 9 on the plunger ball head 4; since the top surface of the plunger ball head is provided with the surface texture 7, high-pressure oil from the cylinder hole 10 flows into the top stepped hole 6 of the plunger ball head 4 through the plunger damping hole 3, and static pressure support is formed between the spindle ball socket 8 and the spherical surface of the plunger ball head 4, which can effectively improve oil film carrying capacity, reduce mechanical loss, reduce leakage, and improve lubrication state.

[0029] The plunger top surface is provided with the surface texture 7, which can improve oil film carrying capacity of the plunger ball hinge friction pair, reduce viscous friction and friction torque, reduce mechanical loss, and enhance dynamic pressure lubrication effect, and has important significance for wear reduction and service life prolongation of the plunger ball hinge friction pair.

[0030] The terms used in the utility model are illustrative and non-limiting terms. Since the utility model can be embodied in various forms without departing from the spirit or essence of the technical scheme, it should be understood that the above examples are not limited to any of the above details, but should be widely interpreted within the spirit and scope defined by the appended claims, and therefore all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A swash plate type piston motor piston characterized by, Comprise: The plunger body, plunger ball head, plunger ball head is connected in the right end of plunger body, the outer wall of left end of plunger body is provided with a plurality of sealing ring grooves, plunger ball head is connected in the right end of plunger body;Plunger body, plunger ball head along the axis direction from left to right are sequentially provided with damping hole, connecting hole, stepped hole, and the damping hole, connecting hole, stepped hole are communicated;The outer wall of the middle part of plunger ball head is provided with a ring groove, and a plurality of surface textures are distributed on the surface between the top of plunger ball head and the ring groove.

2. The oblique-axis plunger motor plunger of claim 1, wherein, The surface texture is an elliptical pit structure.

3. The oblique-axis plunger motor plunger of claim 2, wherein, The ratio of the major and minor axes of the elliptical pit structure is 2:1, the minor axis width is between 0.5-1mm, and the depth is between 10-20μm.

4. The angled plunger motor plunger of claim 1 wherein, The sealing ring groove is provided with a sealing ring.

5. A piston ball joint friction pair for a swash plate type piston motor piston according to any one of claims 1 to 3, characterized in that The left bottom of the main shaft is provided with a main shaft ball socket, and the plunger ball head is installed in the main shaft ball socket.

6. The plunger ball bushing friction pair of claim 5, wherein, The left end of the main shaft is installed in the cylinder hole.

Images