Swash plate supporting structure of hydraulic plunger pump

Abstract

The utility model discloses a swash plate supporting structure of a hydraulic plunger pump, which comprises a pump body and a swash plate arranged in the pump body, a connecting part is formed on the peripheral surface of the swash plate, a needle bearing is arranged on the connecting part, and the installation of the swash plate and the pump body is realized through the needle bearing. According to the swash plate supporting structure, the swash plate is supported in the finish machining hole of the pump body through the needle bearing, semicircular arcs do not need to be machined on the pump body and the swash plate, heat treatment does not need to be conducted on the swash plate, meanwhile, the needle bearing is a standard part, the manufacturability is simple, machining cost is reduced, and machining efficiency is improved. And the stability and the wear resistance of the swash plate supporting structure are improved, and the service life of parts is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a swash plate support structure of hydraulic plunger pump belongs to plunger pump hydraulic product technical field. BACKGROUND

[0002] As an important component in hydraulic system, the performance of hydraulic plunger pump is closely related to the rationality of its structure design.

[0003] The swash plate is an important part in the plunger pump, which mainly converts the rotary motion of the drive shaft into the reciprocating motion of the plunger. The inclination angle of the swash plate can be changed. When the swash plate is inclined, it will drive the plunger to make a reciprocating linear motion in the pump cylinder. This motion mode enables the plunger pump to suck and discharge liquid, realizing the basic function of the pump. At the same time, the change of the inclination angle of the swash plate also affects the displacement of the pump, thereby realizing the precise control of the pump output flow. In the variable process of the plunger pump, the swash plate bears a huge force and stress, and its structure design and manufacturing quality directly affect the performance and service life of the pump. Therefore, as a key part in the hydraulic plunger pump, the swash plate support structure has an important influence on the working efficiency and stability of the pump.

[0004] Figure 1 The swash plate support structure of the current common closed plunger pump has two semicircles machined on the pump body, one end face of the swash plate is a plane, and the other end is two protruding semicircles. During assembly, the swash plate and the pump body are connected through a crescent bushing assembly, the crescent bushing assembly is fixed on the pump body through a resilient pin, a rolling body is provided on the crescent bushing assembly, and the rolling body is in rolling contact with the swash plate. However, the existing swash plate support structure has the following disadvantages: 1. The existing swash plate support structure needs to have two semicircles machined on the pump body, and the coaxiality of the two semicircles needs to be high, which requires a special power knife to be ordered to process, resulting in high processing cost; 2. The existing swash plate structure needs to be machined with two semicircles, and the semicircles need to roll on the rolling body of the crescent bushing assembly. Therefore, the swash plate needs to be quenched after carburizing and then ground to increase the hardness of the swash plate, which is complex in process and high in processing cost, and uncontrollable factors in the swash plate processing will affect the stability and wear resistance of the swash plate support structure; 3. The common crescent bushing assembly is a non-standard part that needs to be matched with the swash plate semicircle to be machined, which is not only higher in price but also poorer in universality compared with general standard parts.

[0005] Due to the above problems of the current swash plate support structure, it is urgent to design a new swash plate support structure that can achieve breakthroughs in economy, process, and universality to meet the demand of modern industry for higher performance and longer service life of hydraulic plunger pumps. UTILITY MODEL CONTENTS

[0006] The utility model wants to solve the technical problem that provides a swash plate support structure of hydraulic plunger pump, makes it have higher stability and wear resistance in the working process, reduces processing cost simultaneously, prolongs the service life of parts.

[0007] In order to solve the above problem, the utility model discloses a technical scheme of a swash plate support structure of hydraulic plunger pump, which comprises a pump body and a swash plate installed in the pump body, a connecting part is formed on the outer circumferential surface of the swash plate, a needle bearing is installed on the connecting part, and the swash plate and the pump body are installed through the needle bearing.

[0008] Preferably, the connecting part comprises oppositely arranged first and second cylinders, and the outer circumferences of the first and second cylinders are both sleeved with needle bearings.

[0009] Preferably, the pump body is provided with a first opening hole for installing the needle bearing.

[0010] Preferably, a second opening hole is formed in the outer surface of the pump body and communicates with the first opening hole, an end cover is installed in the second opening hole, and the end cover is fixedly connected with the pump body.

[0011] Preferably, the swash plate and the inner ring of the needle bearing are in interference fit.

[0012] Preferably, the end face of the needle bearing towards the swash plate is provided with a gasket, and a wave spring washer is arranged between the gasket and the needle bearing at one end of the swash plate where the end cover is installed.

[0013] Preferably, the pump body and the end cover are sealingly connected.

[0014] Preferably, the pump body and the end cover are fixed and locked by screws.

[0015] Preferably, the swash plate is made of 42CrMo and is subjected to quenching and tempering treatment.

[0016] The swash plate support structure of the hydraulic plunger pump provided by the utility model supports the swash plate in the finish machining hole of the pump body through the needle bearing, the pump body and the swash plate do not need to be machined into semicircles, the swash plate does not need to be subjected to heat treatment, the needle bearing is a standard part, and the process is simple, which not only reduces the processing cost, but also improves the stability and wear resistance of the swash plate support structure and prolongs the service life of the parts. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic view of the swash plate support structure of the traditional hydraulic plunger pump.

[0018] Figure 2 It is a schematic view of the swash plate support structure of the hydraulic plunger pump in the utility model.

[0019] Figure 3This is a schematic diagram of the swashplate in this utility model;

[0020] Figure 4 This is a schematic diagram of the pump body in this utility model;

[0021] Figure 5 This is a schematic diagram of the swashplate support structure of this utility model installed on a plunger pump.

[0022] Wherein, 1-pump body; 2-swash plate; 3-gasket; 4-needle roller bearing; 5-wave spring washer; 6-O-ring; 7-end cover; 8-screw; 9-first opening; 10-second opening; 11-first cylinder; 12-second cylinder. Detailed Implementation

[0023] To make this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0024] Example

[0025] like Figures 2 to 4 As shown, this utility model provides a swashplate support structure for a hydraulic piston pump, including a pump body 1 with a cavity for accommodating the swashplate, a swashplate 2 installed in the cavity of the pump body 1, and a needle roller bearing 4 for connecting the pump body 1 and the swashplate 2. By using the needle roller bearing 4 to install the swashplate 2 within the cavity of the pump body 1, the process of machining a semi-circular arc for installation, as in the prior art, is eliminated, simplifying the machining and subsequent assembly process and improving work efficiency. The needle roller bearing 4 is a common standard bearing component, facilitating manufacturing. The swashplate 2 is made of 42CrMo and has undergone quenching and tempering treatment.

[0026] Specifically, the outer circumferential surface of the swashplate 2 is machined to form a first cylinder 11 that mates with the needle roller bearing 4 and a second cylinder 12 opposite to the first cylinder 11. The virtual line connecting the centers of the two cylinders passes through the longitudinal centerline of the swashplate 2. The needle roller bearing 4 is fitted onto the outer circumference of both the first cylinder 11 and the second cylinder 12. Preferably, the first cylinder 11 and the second cylinder 12 have the same diameter for ease of machining.

[0027] Furthermore, the inner wall of the cavity accommodating the swash plate has a first opening 9 for mounting the needle roller bearing 4, and the first opening 9 is a precision-machined hole; the swash plate 2 and the inner ring of the needle roller bearing 4 are interference-fitted. The pump body 1 has a second opening 10, which is also a precision-machined hole; the second opening 10 is located on one side of the first opening 9 for mounting the second cylinder 12 and communicates with the first opening 9; an end cap 7 is installed in the second opening 10, and the end cap 7 is fastened to the outer end face of the second cylinder 12. Preferably, the end cap 7 is fixed to the pump body 1 by screws 8, or it can be fixed by fasteners such as screws or bolts.

[0028] A gasket 3 is provided on the end face of the needle roller bearing 4 facing the swash plate 2. A wave spring washer 5 is provided between the gasket 3 and the needle roller bearing 4 at the end of the swash plate 2 where the end cover 7 is installed. An O-ring 6 is used to seal between the pump body 1 and the end cover 7.

Claims

1. A swashplate support structure for a hydraulic piston pump, characterized in that, It includes a pump body (1) and a swash plate (2) installed inside the pump body (1). A connecting part is formed on the outer peripheral surface of the swash plate (2), and a needle roller bearing (4) is installed on the connecting part. The swash plate (2) and the pump body (1) are installed through the needle roller bearing (4).

2. The swashplate support structure of the hydraulic piston pump as described in claim 1, characterized in that, The connecting part includes a first cylinder (11) and a second cylinder (12) arranged opposite to each other, and needle roller bearings (4) are fitted on the outer periphery of both the first cylinder (11) and the second cylinder (12).

3. The swashplate support structure of the hydraulic piston pump as described in claim 1 or 2, characterized in that, The pump body (1) has a first opening (9) for installing a needle roller bearing (4).

4. The swashplate support structure of the hydraulic piston pump as described in claim 3, characterized in that, The pump body (1) has a second opening (10) on its outer surface that communicates with the first opening (9). An end cap (7) is installed in the second opening (10) and is fixedly connected to the pump body (1).

5. The swashplate support structure of the hydraulic piston pump as described in claim 1, characterized in that, The swash plate (2) and the inner ring of the needle roller bearing (4) are interference-fitted.

6. The swashplate support structure of the hydraulic piston pump as described in claim 4, characterized in that, The end face of the needle roller bearing (4) facing the swash plate (2) is provided with a gasket (3); a wave spring washer (5) is provided between the gasket (3) at one end of the swash plate (2) on which the end cover (7) is installed and the needle roller bearing (4).

7. The swashplate support structure of the hydraulic piston pump as described in claim 4, characterized in that, The pump body (1) and the end cover (7) are sealed together.

8. The swashplate support structure of the hydraulic piston pump as described in claim 7, characterized in that, The pump body (1) and the end cover (7) are fixed and locked together by screws (8).

9. The swashplate support structure of the hydraulic piston pump as described in claim 1, characterized in that, The swash plate (2) is made of 42CrMo and has undergone quenching and tempering treatment.

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