CN215256633U - Plunger pump - Google Patents

Abstract

The application provides a plunger pump, including the pump case, camshaft chamber and plunger chamber have in the pump case, there is the camshaft in the camshaft chamber, the cam has on the camshaft, the plunger motion that the cam promoted to set up in the plunger chamber, the pump case includes the bearing side cap, the bearing side cap is including end wall and the lateral wall that has the shaft hole, and the bearing is including firm cover arranges in inner circle, outer lane on the camshaft and the roller that sets up between inner circle and outer lane, a spacing body with the outer lane is firm to be connected, and spacing portion of circumference set up in spacing body with between the lateral wall, spacing body with clearance fit sets up between the lateral wall, the elastomer with the mode of axial precompression set up in the bearing side cap with between tapered roller bearing's the outer lane. The problem that the spring elasticity is not enough after long-term use can be solved.

Description

Plunger pump

Technical Field

The present application relates to the field of hydraulics, and more particularly to plunger pumps for pressurizing fuel.

Background

Plunger pumps are devices for pressurizing liquids, and in particular in the field of fuel pressurization, plunger pumps are the most commonly used hydraulic devices. Referring to fig. 1, a conventional plunger pump includes a pump housing 90 and a camshaft cavity 91 disposed in the pump housing 90, wherein a camshaft 92 is disposed in the camshaft cavity 91. The pump housing 90 further includes a bearing-side cover 94, and the cam shaft 92 is supported on the bearing-side cover 94 by a bearing 93. The bearing 93 is a tapered roller bearing having an inner ring 931 and an outer ring 932 fitted around the camshaft 92. A spring 95 is provided between the bearing-side cover 94 and the outer race 932 of the bearing 93, and the spring 95 provides a spring force to the bearing outer race 932 toward the inside of the pump housing 90 in the axial direction of the camshaft 92.

However, since the camshaft 92 is subjected to radial force and circumferential force in the process of rotationally pushing the plunger, the bearing outer ring 932 and the bearing side cover 94 as well as the spring 95 are circumferentially rotated, and certain friction is generated between the bearing outer ring 932 and the bearing side cover 94, and after the friction, the spring force of the spring 95 is changed, so that the pretightening force provided by the spring cannot be ensured to meet the requirement.

SUMMERY OF THE UTILITY MODEL

The utility model provides a problem among the prior art can be solved to the purpose of plunger pump and camshaft thereof.

To achieve the above object, the present application provides a plunger pump including a pump housing having a camshaft cavity and a plunger cavity therein, the cam shaft cavity is internally provided with a cam shaft, the cam shaft is provided with a cam, the cam pushes a plunger arranged in the plunger cavity to move, the pump shell comprises a bearing side cover, the bearing side cover comprises an end wall with a shaft hole and a side wall, the bearing comprises an inner ring and an outer ring which are stably sleeved on the camshaft, and a roller arranged between the inner ring and the outer ring, a limiting body is stably connected with the outer ring, a circumferential limiting part is arranged between the limiting body and the side wall, the limiting body and the side walls are arranged in a clearance fit mode, the elastic body is arranged between the bearing side cover and the outer ring of the bearing in an axial pre-compression mode, and the bearing is a tapered roller bearing or an angular contact ball bearing.

This application still has following characteristic, the spacing body has end plate and curb plate, the through-hole has on the end plate, spacing portion of circumference includes spacing key and keyway.

The present application further has features in that the key slot is provided in the side wall, and the length thereof in the direction parallel to the axial direction of the camshaft is greater than the limit key.

The present application further has a feature that the key groove is provided in the side plate, and the length thereof in the direction parallel to the axial direction of the camshaft is larger than the limit key.

The present application also has the following feature that the bearing side cover is provided separately from the housing.

The present application also features the elastomer being a disc spring or a wave spring.

Use the technical scheme that this application provided, can solve the problem that the elastic force of long-term back spring that uses reduces among the prior art.

Drawings

Exemplary embodiments of the present application will be described in detail below with reference to the attached drawings, it being understood that the following description of the embodiments is only for the purpose of explanation and not limitation of the scope of the present application, and in the accompanying drawings:

FIG. 1 is a schematic diagram of a prior art plunger pump;

FIG. 2 is a schematic structural view of one embodiment of the plunger pump of the present application;

FIG. 3 is a schematic view of a structure of a stopper, a bearing side cover and a disc spring according to an embodiment of the present invention;

fig. 4 is a perspective view of a spacing body in an embodiment of the plunger pump of the present application.

Detailed Description

It should be understood that the drawings are for illustrative purposes only and are not intended to limit the application.

Please refer to fig. 2, which is a schematic structural diagram of an embodiment of a plunger pump according to the present application. The plunger pump includes a pump housing 100, the pump housing 100 having a camshaft cavity 110 and a plunger cavity 120 therein. The camshaft 200 is disposed in the camshaft cavity 110, the camshaft 200 is only partially disposed in the camshaft cavity 110, two ends of the camshaft 200 extend out of the camshaft cavity 110, one end of the camshaft is connected to the engine, so as to drive the camshaft 200 to rotate, and the other end of the camshaft is connected to the oil transfer pump. The plunger chamber 120 is disposed along an axis perpendicular to an axial direction of the camshaft chamber 110, and the plunger 300 is disposed in the plunger chamber 120. The camshaft 200 is provided with a plurality of cams 210, and the rotational motion of the camshaft 200 is converted into the up-and-down reciprocating motion of the plunger 300 in the plunger chamber 120 by the arrangement of a tappet (not numbered), thereby pressurizing the fuel.

As shown in fig. 3, the pump housing 100 includes a bearing-side cover 400, the bearing-side cover 400 has an end wall 410, a shaft hole 411 is formed on the end wall 410, and the cam shaft 200 can extend from the shaft hole 411. The bearing-side cover 400 also has a side wall 420 connected to an end wall 410. In some embodiments, including the present embodiment, the bearing-side cover 400 is provided separately from the pump housing 100 and is connected thereto by a fastener. In other embodiments, the bearing-side cover 400 is integrally provided with the pump housing 100.

In some embodiments, including the present embodiment, one end of the cam shaft 200 is mounted to the pump housing 100 through a bearing. One end connected to the engine to input power, which is mounted through a tapered roller bearing 500 in this embodiment, is mounted on the bearing-side cover 400. The tapered roller bearing 500 includes an inner race 510, an outer race 520, and rollers 530 disposed therebetween. The inner race 510 is fixedly coupled to the camshaft 200 to be rotationally moved together with the camshaft 200.

Referring to fig. 4, the limiting body 600 includes an end plate 620 and a side plate 630, a through hole 621 is formed on the end plate 620, and the cam shaft 200 can pass through the through hole 621. The side plate 630 is formed in a cylindrical shape perpendicularly enclosed with the end plate 620 in this embodiment. The inner contour of the outer ring 520 is similar to that of the outer ring 520, so that the outer contour of the outer ring 520 is similar to that of the inner contour of the side wall 420, and the outer contour of the outer ring is arranged in the side wall 420 in a clearance fit manner, so that relative movement along the axial direction of the camshaft 200 can be generated between the outer ring and the side wall. The curb plate 630 of spacing body 600 is last to have seted up keyway 631, and has seted up keyway 421 on the corresponding position of lateral wall 420, spacing key 800 sets up in this keyway 421, 631, and two keyways are greater than spacing key 800 along the length that is on a parallel with camshaft 200 axial direction, thereby spacing key 800 can produce the slip along axial direction in the keyway, the spacing portion of circumference is constituteed to the connection pair of above-mentioned spacing key and keyway, its restriction spacing body 600 is at the rotation of circumference, but allow spacing body 600 at the slip along camshaft axial direction. In other embodiments, the circumferential limiting part may have various implementations, for example, a limiting key may be directly disposed on one side of the limiting body or the bearing side cover, a key groove may be disposed on the other side, or other manners may be adopted for circumferential limiting.

Referring to fig. 2, an elastic body 700, in this embodiment, a disc spring, is disposed between the position-limiting body 600 and the bearing-side cover 400. The pre-compressed end of the disc spring abuts against the end wall 420 of the bearing side cover 400, and the end abuts against the end plate 620 of the stopper 600. So that the bearing outer race 520 can be maintained in a reasonable position. Of course, in other embodiments, the elastic body 700 may be in other forms as long as it can provide a stable elastic force inward in the axial direction of the camshaft 200 to the outer race 520.

By using the arrangement of the disc spring, the circumferential rotation of the limiting body is limited by the arrangement of the circumferential limiting part on the limiting body, so that the rotating friction among the limiting body, the bearing side cover and the disc spring is reduced, and the elastic force of the disc spring is ensured. The tapered roller bearings described above may be replaced by other similar bearings capable of simultaneously carrying axial and radial loads, such as angular contact ball bearings. The elastic body may be a wave spring.

Of course, other embodiments of the present application are also possible, and the present application is not limited to the embodiments described above.

Pump housing 100, camshaft cavity 110, plunger cavity 120

Camshaft 200, cam 210

Plunger 300

Bearing side cover 400, end wall 410, shaft hole 411, side wall 420, key groove 421 tapered roller bearing 500, inner ring 510, outer ring 520, roller 530 limiting body 600, end plate 620, penetrating hole 621, side plate 630, key groove 631 elastic body 700

Limit key 800

Pump housing 90

Camshaft cavity 91

Camshaft 92

Bearing side cover 94

Bearing 93, inner ring 931, outer ring 932

A spring 95.

Claims (6)

1. A plunger pump comprises a pump housing (100), a camshaft cavity (110) and a plunger cavity (120) are arranged in the pump housing (100), a camshaft (200) is arranged in the camshaft cavity (110), a cam (210) is arranged on the camshaft (200), the cam (210) pushes a plunger (300) arranged in the plunger cavity (120) to move, and the plunger pump is characterized in that the pump housing (100) comprises a bearing side cover (400), the bearing side cover (400) comprises an end wall (410) and a side wall (420) which are provided with a shaft hole (411), the bearing comprises an inner ring (510) and an outer ring (520) which are stably sleeved on the camshaft (200) and a roller (530) arranged between the inner ring (510) and the outer ring (520), a limiting body (600) is stably connected with the outer ring (520), and a circumferential limiting part (610) is arranged between the limiting body (600) and the side wall (420), the limiting body (600) and the side wall (420) are arranged in a clearance fit mode, the elastic body (700) is arranged between the bearing side cover (400) and the outer ring (520) of the bearing in an axial pre-compression mode, and the bearing is a tapered roller bearing or an angular contact ball bearing.

2. The plunger pump according to claim 1, wherein the stopper body (600) has an end plate (620) and a side plate (630), the end plate (620) has a through hole (621), and the circumferential stopper portion (610) includes a stopper key (800) and a key groove.

3. The plunger pump according to claim 2, wherein the key groove is provided in the side wall, and has a length in a direction parallel to the axial direction of the camshaft (200) greater than the limit key (800).

4. The plunger pump according to claim 2, wherein the key groove (421) is provided in the side plate (630) with a length in a direction parallel to the axial direction of the camshaft (200) larger than the limit key (800).

5. The plunger pump according to claim 1, characterized in that the bearing-side cover (400) is provided separately from the housing (100).

6. Plunger pump according to claim 1 or 2, characterised in that the elastomer body (700) is a disc spring or a wave spring.

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