CN2228988Y

CN2228988Y - Improved inclined plate type axial plunger pump

Info

Publication number: CN2228988Y
Application number: CN 95234530
Authority: CN
Inventors: 徐绳武; 徐�明; 李庆美; 徐慧
Original assignee: 徐绳武
Priority date: 1995-08-31
Filing date: 1995-08-31
Publication date: 1996-06-12
Anticipated expiration: 2005-08-31

Abstract

The utility model provides an improved inclined plate type axial plunger pump, being composed of a pump body, a pump housing, an end cap, an inclined plate, a bimetallic plate, a crosshead shoe, a drive shaft and a plunger pump unit. The bimetallic plate is arranged on the pump housing, and the inclined plate is arranged on the drive shaft. The axial plunger pump is characterized in that the inclined plate is provided with a plurality of settling tanks and damping holes on the high pressure side, and the bimetallic plate is provided with a plurality of small settling tanks. When oil is pressed by the pump, high pressure oil liquid in a plunger cylinder passes through the damping holes and the small settling tanks, and enters into the big settling tanks, so that pulsation which is generated between the inclined plate and the bimetallic plate can supply liquid lubrication, and accordingly, static pressure lubricating oil film can be formed. The utility model has the advantages of simple structure, reasonable design, long service life, etc. The pressure of the pump can be increased.

Description

A kind of modified model cam-type axial piston pump

The utility model relates to a kind of simple in structure, and is easily manufactured, and volume is little, in light weight, the hydraulic transmission that the life-span is long, specifically a kind of modified model cam-type axial piston pump.

Axial piston pump is widely used in Hydraulic Power Transmission System, in the axial piston pump of prior art, as me No. the 95233940.4th, Chinese patent application, name is called axial plunger pump structure described in the public technology of " diclinic dish duplex axial piston pump ", be provided with several plunger pump unit around the axle center on its pump housing, each plunger pump unit all is to come drive plunger up and down reciprocatingly to work by the swash plate that is installed on the transmission shaft, and fluid is entered oil drain passage through the non-return valve of each plunger pump unit bottom, in order to reduce the frictional force between swash plate and the pump case, improve the working life of plunger pump, between swash plate and pump case, be provided with bimetallic plates, so above-mentioned axial piston pump is in structure, volume, weight, on the technical orders such as processing cost, all be greatly improved than original axial piston pump, but also expose some problems, as bimetallic plates when the pressure of pump further improves, lack lubricated on the rubbing surface because of bimetallic plates, produced the burn phenomenon, be ball valve because of the delivery valve in the plunger pump unit in addition, inertia is big, its athletic meeting produces bigger impact noise, and this also is the common fault of axial piston pump of the prior art.

The purpose of this utility model provides a kind of simple in structure, cost is low, efficient is high, noise is low, pressure is high, the life-span is long a kind of modified model cam-type axial piston pump.

The purpose of a kind of modified model cam-type axial piston pump of the utility model realizes in the following manner: use the non-return valve in the axial piston pump unit instead plate valve to reduce its noise, oiling damping hole and lubricated deep gouge are being set to improve the greasy property between bimetallic plates and the swash plate on swash plate and the bimetallic plates.

Figure of description 1 is a kind of structural representation of modified model cam-type axial piston pump;

Figure of description 2 is pressed the structural representation of oily side part for a kind of modified model cam-type axial piston pump swash plate.

With reference to Figure of description to modified cam-type axial piston pump of the present utility model Explain below the work.

A kind of its structure of modified cam-type axial piston pump of the present utility model is by pump Body [9], pump case [8], end cap [11], swash plate [5], bimetallic plates [4], power transmission shaft [7] and the plunger displacement pump unit form, bimetallic plates [4] are installed on the pump case [8], swash plate [5] Be installed on the power transmission shaft [7], power transmission shaft [7] is fixed on pump case by bearing [12] and [15] [8] and the pump housing [9] in the middle of, pump case [8] and end cap [11] be installed in the pump housing [9] about Two ends, the plunger displacement pump unit that is formed by plunger case [19], plunger [6] and draining valve group Be located on the pump housing [9]. Pump case [8] is installed in the left part of the pump housing [9], and swash plate [5] reaches Bimetallic plates [4] are positioned among the cavity of pump case [8], and bimetallic plates [4] are installed in tiltedly Between dish [5] and the pump case [8], oil-in [13] is opened on the sidewall of pump case [8], goes out Hydraulic fluid port [14] is located at the side of the pump housing [9]. The force feed side of swash plate [5] and transmission [7] axle On vertical plane, be processed with one or several big deep gouge [1], at big deep gouge [1] Several damping holes [3] that the next door has and swash plate [5] plane is perpendicular, this damping hole [3] and greatly deep gouge [1] is not connected, but the centre bore of energy and piston shoes [16] is connected. Be processed with several little deep gouges on the slidingsurface that bimetallic plates [4] and swash plate [5] join [2], when swash plate forwards certain position to, big with on the swash plate [5] of these little deep gouges [2] The centre bore of deep gouge [1], damping hole [3] and piston shoes [16] is linked up. In the plunger displacement pump unit The draining valve group be by valve seat [17], valve plate [10], spring [20] and guiding plug screw [18] form, valve seat [17] is installed in plunger case [19] bottom, valve plate [10] plane with Valve seat [17] sealing, the another side of valve plate [10] is equipped with spring [20], is installed in guiding In the endoporus of plug screw [18].

Embodiment:

A kind of modified model cam-type axial piston pump processing and fabricating of the present utility model is very simple and convenient, use the non-return valve of each axial piston pump unit bottom instead unidirectional plate valve shown in the by specification accompanying drawing, because its weight of valve plate in the plate valve is light than valve ball, when opening and closing, impacts by valve the noise that produces so significantly reduced.The greasing of bimetallic plates and swash plate is when swash plate forwards certain position to, little deep gouge on the bimetallic plates is linked up big deep gouge on the swash plate and damping hole, at this moment in the plunger pump unit plunger in the piston shoes center hole of high-voltage oil liquid by plunger head enter in the damping hole on the swash plate, little deep gouge on bimetallic plates enters in the big deep gouge on the swash plate again, make in the big deep gouge and be full of high-voltage oil liquid, thereby balance the major part of plunger to sloping tray axial thrust, alleviated the frictional force of swash plate to bimetallic plates, and make between them form hydrostatic lubricated.

When swash plate is rotated further when turning over a certain angle, little deep gouge on the bimetallic plates and the damping hole on the swash plate disconnect, high-voltage oil liquid in the big deep gouge is sealed by the plane of bimetallic plates and swash plate, can only form oil film by the gap leakage loss between them, when swash plate continues to turn over a certain angle, the little deep gouge of on the bimetallic plates another is linked up another damping hole on the swash plate and big deep gouge again, finish and last identical oiling process, make and form constantly pulsation fuel feeding greasing between swash plate and the bimetallic plates, thereby solved the insufficient lubrication between swash plate of the prior art and the bimetallic plates and be directed at axial piston pump bimetallic plates burning problems when pressure advances a raising, thereby Pressure in Axial Piston Pump is improved, and remain high efficiency.

A kind of modified cam-type axial piston pump of the present utility model and prior art are mutually Ratio, the pressure with simple in structure, reasonable in design, long service life, pump can be greatly Improve, etc. characteristics, therefore, have well extensively popularizing value.

Except the described technical characterictic of specification, be the known of those skilled in the art Technology.

Claims

1. modified model cam-type axial piston pump, comprise the pump housing, pump case, end cap, swash plate, bimetallic plates, piston shoes, transmission shaft and plunger pump unit, it is characterized in that bimetallic plates are installed on the pump case, swash plate is installed on the transmission shaft, transmission shaft by bearing fixing in the middle of the pump case and the pump housing, pump case and end cap are installed in the two ends, the left and right sides of the pump housing, and the plunger pump unit of being made up of plunger case, plunger and draining valve group is located on the pump housing.

2. a kind of modified model cam-type axial piston pump according to claim 1, it is characterized in that pump case is installed in the left part of the pump housing, swash plate and bimetallic plates are positioned among the cavity of pump case, bimetallic plates are between swash plate and pump case inwall, filler opening is opened on the sidewall of pump case, and oil outlet is located at the side of the pump housing.

3. a kind of modified model cam-type axial piston pump according to claim 2, it is characterized in that the high pressure side processes one or several big deep gouge on the perpendicular plane of swash plate and transmission shaft, next door at big deep gouge has and the perpendicular damping hole in swash plate plane, this damping hole and big deep gouge are not connected, but the center hole of its energy and piston shoes communicates, be processed with several little deep gouges on the slidingsurface that bimetallic plates and swash plate join, these little deep gouges are linked up big deep gouge on the swash plate and damping hole.

4, a kind of modified model cam-type axial piston pump according to claim 1, it is characterized in that the draining valve group in the plunger pump unit is made up of valve seat, valve plate, spring and guiding plug screw, valve seat is installed in the plunger case bottom, valve plate plane and valve base sealing, the another side of valve plate is equipped with spring, is installed in the endoporus of guiding plug screw.