A plunger pump for rail

Abstract

The utility model discloses a rail plunger pump, which comprises a pump body and a transmission shaft, a bearing is arranged between the pump body and the transmission shaft, a cylinder body is fixed on the outer side of the transmission shaft, a plurality of sliding plungers are arranged in the cylinder body, a ball socket is arranged at one end of the plunger close to the thrust plate, a ball connected to the thrust plate is arranged in the ball socket, the ball rolls in the ball socket, a single-lip oil seal is arranged at one end of the bearing close to the plunger, and the single-lip oil seal is arranged between the transmission shaft and the pump body. Compared with the prior art, in the utility model, by installing a ball on the plunger, the original sliding connection with the thrust plate is changed to a rolling connection, thereby reducing friction and reducing the torque of the pump. Secondly, the double-lip oil seal arranged at the outer end of the bearing is changed to a single-lip oil seal arranged at the inner end of the bearing, which further reduces the torque of the pump, thereby effectively reducing the running-in time of the pump before leaving the factory.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger pumps, in particular to a plunger pump for tracks. Background Art

[0002] The piston pump drives the rotation of each piston arranged in the axial direction of the cylinder body through the rotation of the cylinder body. The patent with publication number CN204921279U discloses an axial piston pump for railway hydraulic track moving. The structure of the piston pump is shown in the attached Figure 1 , the transmission shaft drives the cylinder body to rotate, and the plunger moves against the thrust plate under the force of the spring, and the plunger ball head and the thrust plate will have a relative movement. This relative movement is sliding friction, which will cause local heating and greater friction, which will increase the torque of the pump. Secondly, the transmission shaft and the oil seal are sealed by double lips, which has large friction and friction torque. Due to safety considerations, the current control of the railway hydraulic track moving system is very strict, which means that the torque requirements for the pump are high, and it requires the pump to have a lower torque. Therefore, in order to meet the torque requirements, the manufacturer must run for a long time. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] Based on this, the utility model proposes a plunger pump for rails, aiming to solve the problem that the torque of the pump in the prior art is large and a long pump factory running time is required.

[0005] (II) Technical solution

[0006] In order to overcome the above problems or at least partially solve the above problems, the utility model provides a rail plunger pump, comprising a pump body and a transmission shaft, a bearing is arranged between the pump body and the transmission shaft, a cylinder body is fixed on the outer side of the transmission shaft, a plurality of sliding plungers are arranged in the cylinder body, a ball socket is arranged at one end of the plunger close to the thrust plate, a ball connected to the thrust plate is arranged in the ball socket, the ball rolls in the ball socket, a single-lip oil seal is arranged at one end of the bearing close to the plunger, and the single-lip oil seal is arranged between the transmission shaft and the pump body.

[0007] Preferably, the bearing is a radial ball bearing.

[0008] Preferably, the radial ball bearing is lubricated with grease.

[0009] Preferably, the pump body is provided with a groove adapted to the single-lip oil seal.

[0010] Preferably, a blocking member is provided at one end of the radial ball bearing away from the single-lip oil seal.

[0011] Preferably, the blocking member is a retaining ring, and the outer side of the retaining ring is stuck in the pump body.

[0012] Preferably, a limiting protrusion is provided on the transmission shaft, and one end of the bearing close to the single-lip oil seal abuts against the limiting protrusion.

[0013] Preferably, no protrusion abutting against the bearing is provided on the transmission shaft at the outer end of the bearing.

[0014] Preferably, the ball is made of stainless steel.

[0015] (III) Beneficial effects

[0016] The track plunger pump of the utility model has the following advantages:

[0017] In the utility model, by installing a ball on the plunger, the original sliding connection with the support plate is changed to a rolling connection, thereby reducing friction and reducing the torque of the pump. Secondly, the double-lip oil seal arranged at the outer end of the bearing is changed to a single-lip oil seal arranged at the inner end of the bearing, further reducing the torque of the pump, thereby effectively reducing the time for the pump to run in after leaving the factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of the prior art;

[0020] Figure 2 It is a structural schematic diagram of the utility model.

[0021] Description of reference numerals:

[0022] 1. Pump body, 2. Drive shaft, 3. Bearing, 4. Cylinder body, 5. Plunger, 6. Thrust plate, 7. Ball, 8. Single lip oil seal, 9. Stopper, 10. Double lip oil seal, 100. Limiting protrusion. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model is described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific implementation disclosed below.

[0024] See attached Figure 2, this embodiment provides a kind of rail plunger pump, including a pump body 1 and a transmission shaft 2, a bearing 3 is arranged between the pump body 1 and the transmission shaft 2, the transmission shaft 2 rotates in the pump body 1, a cylinder body 4 is fixed on the outer side of the transmission shaft 2, a plurality of sliding plungers 5 are arranged in the cylinder body 4, a ball socket is arranged at the end of the plunger 5 close to the thrust plate 6, a ball 7 connected to the thrust plate 6 is arranged in the ball socket, and the ball 7 rolls in the ball socket, and specifically, the ball 7 is made of stainless steel. A single-lip oil seal 8 is arranged at the end of the bearing 3 close to the plunger 5, and the single-lip oil seal 8 is arranged between the transmission shaft 2 and the pump body 1. The utility model processes a ball socket at the head of the plunger 5, and a steel ball is placed in it. The steel ball can roll freely in the ball socket at the head of the plunger 5, and the end of the steel ball exposed from the ball socket contacts the thrust plate 6. When the steel ball and the thrust plate 6 have relative motion, the original sliding friction is changed into rolling friction, which greatly reduces the friction and heat generation, thereby effectively reducing the torque of the pump and reducing the time for the pump to run out of the factory. Secondly, refer to the attached Figure 1 The prior art plunger pump uses a double lip oil seal 10 for sealing, while the utility model uses a single lip oil seal 8 for sealing. Since the lip seal is achieved by the interference between the sealing material and the transmission shaft 2, the friction force will be reduced when the number of seals is reduced, thereby reducing the friction torque when the transmission shaft 2 rotates, which is conducive to reducing the torque of the pump.

[0025] Specifically, the bearing 3 is a radial ball bearing.

[0026] As another embodiment of the utility model: the radial ball bearing adopts grease lubrication. The radial ball bearing is changed from the original oil lubrication to grease lubrication. The balls of the original bearing 3 are immersed in oil, and the oil needs to be stirred when rolling, and the oil resistance is large. The change to grease lubrication eliminates the torque of this resistance acting on the transmission shaft 2, thereby further reducing the torque of the pump.

[0027] One installation method of the single-lip oil seal 8 is as follows: a groove matching the single-lip oil seal 8 is provided on the pump body 1 .

[0028] As another embodiment of the present utility model: a blocking member 9 is provided at one end of the radial ball bearing away from the single-lip oil seal 8 , and the blocking member 9 is used to block the radial ball bearing from coming out of the pump body 1 .

[0029] One installation method of the blocking member 9 is as follows: the blocking member 9 is a retaining ring, the outer side of the retaining ring is clamped in the pump body 1, and the inner side of the retaining ring clamps the bearing 3.

[0030] As another embodiment of the present utility model: a limiting protrusion 100 is provided on the transmission shaft 2, and one end of the bearing 3 close to the single-lip oil seal 8 abuts against the limiting protrusion 100. Specifically, a step is provided in the pump body 1, the inner side of the bearing 3 abuts against the limiting protrusion 100, and the outer side of the bearing 3 abuts against the step of the pump body 1. The transmission shaft 2 at the outer end of the bearing 3 is not provided with a protrusion abutting against the bearing 3, the transmission shaft 2 is of the same size, and the bearing 3 can come out of the transmission shaft 2.

[0031] Compared with the original structure, the utility model reduces the parts such as oil seal flange, screws, sealing rings, etc., the overall structure becomes simpler, and is conducive to reducing costs.

[0032] Finally, the method of the utility model is only a preferred implementation scheme and is not intended to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

[0033] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A rail plunger pump, characterized in that: It includes a pump body and a transmission shaft, a bearing is arranged between the pump body and the transmission shaft, a cylinder body is fixed on the outer side of the transmission shaft, a plurality of sliding plungers are arranged in the cylinder body, a ball socket is arranged at one end of the plunger close to the thrust plate, a ball connected to the thrust plate is arranged in the ball socket, the ball rolls in the ball socket, a single-lip oil seal is arranged at one end of the bearing close to the plunger, and the single-lip oil seal is arranged between the transmission shaft and the pump body.

2. The rail plunger pump according to claim 1, characterized in that: The bearing is a radial ball bearing.

3. The rail plunger pump according to claim 2, characterized in that: The radial ball bearing is lubricated with grease.

4. The rail plunger pump according to claim 1, characterized in that: The pump body is provided with a clamping groove matched with the single-lip oil seal.

5. The rail plunger pump according to claim 3, characterized in that: A blocking member is provided at one end of the radial ball bearing away from the single-lip oil seal.

6. The rail plunger pump according to claim 5, characterized in that: The blocking member is a retaining ring, and the outer side of the retaining ring is stuck in the pump body.

7. The rail plunger pump according to claim 6, characterized in that: The transmission shaft is provided with a limiting protrusion, and one end of the bearing close to the single-lip oil seal abuts against the limiting protrusion.

8. The rail plunger pump according to claim 7, characterized in that: The transmission shaft at the outer end of the bearing is not provided with a protrusion abutting against the bearing.

9. The rail plunger pump according to claim 1, characterized in that: The ball is made of stainless steel.

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