CN201433865Y

CN201433865Y - Improved inclined-shaft hydraulic plunger pump or a motor

Info

Publication number: CN201433865Y
Application number: CN2009200710467U
Authority: CN
Inventors: 李斌
Original assignee: Shanghai Electric Hydraulics and Pneumatics Co Ltd
Current assignee: Shanghai Nabo Tes Hydraulic Co., Ltd.
Priority date: 2009-04-24
Filing date: 2009-04-24
Publication date: 2010-03-31
Anticipated expiration: 2019-04-24

Abstract

The utility model relates to an improved inclined-shaft hydraulic plunger pump or a motor, which comprises a plunger piston and a cylinder body, wherein the plunger piston comprises a conical section,a ball head is arranged on the front end of the conical section, an upper and a lower annular groove are arranged on the rear end of the conical section and are used for holding two plunger rings, and a transition cylindrical surface between the two annular grooves is formed by four sections of cylindrical surfaces. By improving the sealing surface between the plunger piston and the plunger holeof the cylinder body, the plunger piston is ensure to always keep favorable sealing with the plunger piston during the telescopic movement, so the leakage phenomenon can be prevented, and the output can be maintained stable.

Description

A kind of improved hydraulic clino-axial piston pump or motor

Technical field

The utility model relates to hydraulic pressure, machinery, electron controls technology field, relates in particular to a kind of improved hydraulic clino-axial piston pump or motor.

Background technique

Hydraulic axial piston pump or motor, because that it has a volume is little, in light weight, specific power is big, is easy to advantages such as control, is widely used at present in the various hydraulic systems.

In hydraulic axial piston pump or motor, the inclined shaft axial piston pump is a kind of high-pressure large-displacement axial piston pump, its structure characteristic and the key technical indexes are: volume is little, compact structure is simple, manufacturability is relatively good, and pressure reaches as high as 40Mpa, and rotating speed reaches as high as 6300rpm, the total efficiency height, life-span is about 5000 hours, is that the world today is more advanced, a kind of axial piston pump of reliable performance.Owing to have wide range of applications, be again to make the running mechanism integral device reduce the power source of volume, so this inclined shaft axial piston pumps of a large amount of employings of some countries of the countries in the world such as the U.S., Japan, India, China and Europe.

Present inclined shaft axial piston pump is mainly by housing, the plunger land, cylinder body, plunger, thrust plate and pump cover are formed the seal operation volume, plunger land and transmission shaft are made of one, be installed on the ball bearing and cone bearing in the housing, plunger land and newel are plugged with an inclination angle, 7 plungers are housed in the plunger hole of cylinder body, the bulb of plunger cooperates with ball-and-socket on the plunger land, the bulb of plunger connects with the plunger land by the backhaul dish, the center plunger is housed in the center hole of cylinder body, the center plunger base is equipped with prefastening force spring, thrust plate is installed on the pump cover, and pump cover is connected with housing, and the bi-side of pump cover are provided with filler opening and oil outlet; On housing, offer discharge orifice.

Only depend on the plunger ring that is installed on the plunger to seal between plunger and the cylinder body in the existing inclined shaft axial piston pump, sealing effect is not very desirable, sometimes can cause leakage, the decompression phenomenon occurs, makes output unstable, decrease in efficiency.

The model utility content

Technical problem to be solved in the utility model is to provide good sealing effect between a kind of plunger and the cylinder body, exports stable improved hydraulic clino-axial piston pump or motor.

To achieve these goals, the technical solution adopted in the utility model is as follows:

A kind of improved hydraulic clino-axial piston pump or motor, by housing, the plunger land, cylinder body, plunger, thrust plate and pump cover are formed the seal operation volume, plunger land and transmission shaft are made of one, be installed on the ball bearing and cone bearing in the housing, plunger land and newel are plugged with an inclination angle, 7 plungers are housed in the plunger hole of cylinder body, the bulb of plunger cooperates with ball-and-socket on the plunger land, the bulb of plunger connects with the plunger land by the backhaul dish, the center plunger is housed in the center hole of cylinder body, the center plunger base is equipped with prefastening force spring, thrust plate is installed on the pump cover, pump cover is connected with housing, and the bi-side of pump cover are provided with filler opening and oil outlet; On housing, offer discharge orifice; Described plunger comprises a conical section, the front end of conical section is a bulb, the rear end of conical section has two annular grooves up and down, be used to place two plunger rings, it is characterized in that, transition cylinder between described two annular grooves is made of four sections cylinders, look down by plunger upper part, be divided into first cylinder, second cylinder, the 3rd cylinder and the 4th cylinder, wherein the separation of second cylinder and the 3rd cylinder is the center of described transition cylinder, with the elongation line at the center of this transition cylinder and the medial axis joint of described plunger is the center of circle, with this center of circle to the distance between the separation of described second cylinder and the 3rd cylinder is that diameter is done a circle, described second cylinder and the 3rd cylinder are positioned on the circumference of this circle, and the segment angle of second cylinder be 3 ° 20 ' to 3 ° 21 ' 30 ", the segment angle of the 3rd cylinder be 4 ° to 4 ° 10 '; First cylinder and second cylinder are tangent, corner cut be 3 ° 20 ' to 3 ° 21 ' 30 "; The 4th cylinder and the 3rd cylinder are tangent, corner cut be 4 ° to 4 ° 10 '.

The utility model has guaranteed plunger in the fore and aft motion process by to the improvement of sealing surface between the plunger hole of plunger and cylinder body, all the time can and plunger hole between keep good sealing, leakage phenomenon can not appear, make output keep stablizing.

Description of drawings

Describe the utility model in detail below in conjunction with the drawings and specific embodiments:

Fig. 1 is the structural representation of improved hydraulic clino-axial piston pump of the present utility model or motor.

Fig. 2 is the piston structure schematic representation of improved hydraulic clino-axial piston pump of the present utility model or motor.

Fig. 3 is the enlarged diagram at the I place of Fig. 2.

Embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.

Referring to Fig. 1, the seal operation volume that improved hydraulic clino-axial piston pump or motor are made up of housing 1, plunger land 2, cylinder body 3, plunger 4, thrust plate 5 and pump cover 6, plunger land 2 is made of one with transmission shaft 7, is installed on the ball bearing 13 and cone bearing 14 in the housing 1.Plunger land 2 has an inclination angle with

center plunger

8, and 7 plungers 4 are housed in the plunger hole 9 of cylinder body 3, and the bulb of plunger 4 cooperates with ball-and-socket on the plunger land 2, and connects with plunger land 2 by backhaul dish 11.Center plunger 8 is housed in the center hole of cylinder body 3, prefastening force spring 12 is equipped with in the bottom of center plunger 8, spring 12 is pressed in the bulb of

center plunger

8 and 7 plungers 4 in the ball-and-socket on the plunger land 2, says that also an end sphere of cylinder body 3 tightly is pressed on the ball surface of thrust plate 5 simultaneously.Thrust plate 5 is installed on the pump cover 6, and pump cover 6 is connected with housing 1.Be provided with filler opening and oil outlet (not shown) in the bi-side of pump cover 6, on housing 1, have discharge orifice 15.Thrust plate 5 is designed to the sphere distributing construction with the surface of contact of cylinder body 3.

As shown in Figure 2, plunger 4 comprises a conical section 16, and the front end of conical section 16 is a bulb 17, and the rear end of conical section 16 has two annular grooves 10, is used to place two plunger rings.

Referring to Fig. 3, article two, the transition cylinder between the annular groove 10 is made of four sections cylinders, look down by plunger 4 tops, be divided into first cylinder 4.1, second cylinder 4.2, the 3rd cylinder 4, the 3 and the 4th cylinder 4.4, wherein the separation of second cylinder 4.2 and the 3rd cylinder 4.3 is the center of transition cylinder, medial axis 4.6 joints with the elongation line 4.5 at the center of this transition cylinder and plunger 4 are the center of circle 4.7, with the distance between the separation of these center of circle 4.7 to second cylinders 4.2 and the 3rd cylinder 4.3 is that diameter is done a circle 4.8, second cylinder 4.2 and the 3rd cylinder 4.3 are positioned on the circumference of this circle 4.8, and the segment angle of second cylinder 4.2 be 3 ° 20 ' to 3 ° 21 ' 30 ", the segment angle of the 3rd cylinder 4.3 be 4 ° to 4 ° 10 '; First cylinder 4.2 and second cylinder 4.2 are tangent, corner cut be 3 ° 20 ' to 3 ° 21 ' 30 "; The 4th cylinder 4.4 and the 3rd cylinder 4.3 are tangent, corner cut be 4 ° to 4 ° 10 '.Improvement by to sealing surface between the plunger hole of plunger 4 and cylinder body 3 has guaranteed plunger 4 in the fore and aft motion process, all the time can and plunger hole between keep good sealing, leakage phenomenon can not appear, make output keep stable.

When the utility

model transmission shaft

7 and 2 rotations of plunger land, drive cylinder body 3 rotations by plunger 4, when plunger 4 stretches out, it is the pump oil suction that the low pressure window of fluid by filler opening and thrust plate 5 enters plunger 4 bottoms, when transmission shaft 7 and the 2 continuation rotations of plunger land, the fluid of plunger 4 bottoms is discharged by the high pressure window and the oil outlet on the pump cover 6 of thrust plate 5, oil extraction for pump, when rotating a circle, cylinder body just forms suction, oil extraction respectively once like this, promptly be this pump delivery g, the flow of this pump is Q=nq.The working principle of improved hydraulic clino-axial piston motor is opposite with said process.

More than show and described basic principle of the present utility model, major character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in the foregoing description and the specification is principle of the present utility model; the utility model also has various changes and modifications under the prerequisite that does not break away from the utility model spirit and scope, and these changes and improvements all fall in the claimed scope of the present utility model.The protection domain that the utility model requires is defined by appending claims and equivalent thereof.

Claims

1, a kind of improved hydraulic clino-axial piston pump or motor, by housing, the plunger land, cylinder body, plunger, thrust plate and pump cover are formed the seal operation volume, plunger land and transmission shaft are made of one, be installed on the ball bearing and cone bearing in the housing, plunger land and newel are plugged with an inclination angle, 7 plungers are housed in the plunger hole of cylinder body, the bulb of plunger cooperates with ball-and-socket on the plunger land, the bulb of plunger connects with the plunger land by the backhaul dish, the center plunger is housed in the center hole of cylinder body, the center plunger base is equipped with prefastening force spring, thrust plate is installed on the pump cover, pump cover is connected with housing, and the bi-side of pump cover are provided with filler opening and oil outlet; On housing, offer discharge orifice; Described plunger comprises a conical section, the front end of conical section is a bulb, the rear end of conical section has two annular grooves up and down, be used to place two plunger rings, it is characterized in that, transition cylinder between described two annular grooves is made of four sections cylinders, look down by plunger upper part, be divided into first cylinder, second cylinder, the 3rd cylinder and the 4th cylinder, wherein the separation of second cylinder and the 3rd cylinder is the center of described transition cylinder, with the elongation line at the center of this transition cylinder and the medial axis joint of described plunger is the center of circle, with this center of circle to the distance between the separation of described second cylinder and the 3rd cylinder is that diameter is done a circle, described second cylinder and the 3rd cylinder are positioned on the circumference of this circle, and the segment angle of second cylinder be 3 ° 20 ' to 3 ° 21 ' 30 ", the segment angle of the 3rd cylinder be 4 ° to 4 ° 10 '; First cylinder and second cylinder are tangent, corner cut be 3 ° 20 ' to 3 ° 21 ' 30 "; The 4th cylinder and the 3rd cylinder are tangent, corner cut be 4 ° to 4 ° 10 '.