CN2667194Y - Internal controlling electric hydraulic ratio variable quantity axial plunger pump - Google Patents

Abstract

The utility model discloses an internal controlling electro hydraulic proportional variable axial piston pump for the hydraulic transmission, and comprises body and variable part; the transmission shaft on the body is driven by the motor, the cylinder body assembly is driven to rotate by the spline of transmission shaft; and a plurality of axial piston distributed on the cylinder body rotates with rotating center, the slip shoe is locked on the head of axial piston ball; then the center spring presses the slip shoe on the thrust board with a certain angle through the inner sleeve, the steel ball and the return disc; then the thrust board is floating arranged on the variable head, the variable head is connected with the variable piston, the pressure reducing valve is arranged at the lower part of variable part, the inlet of the pressure reducing valve is communicated with the oil outlet on the body, and the oil return port of pressure reducing valve is communicated with the oil inlet on the body. Utilizing the current change of upper proportional electromagnet in variable part controls the movement of pilot valve to make the oil in the pressure reducing valve into the upper and the lower cavity of variable piston, which makes the upper and the lower movement of variable piston to control the movement of variable head and realize the variable of pump; compared with using the external controlling oil pump to control the variable, the utility model has the advantages of saving energy and low costs.

Description

The internal controlling electrohydraulic proportion variable axial plunger pump

Affiliated technical field

The utility model relates to a kind of hydraulic transmission part, particularly relates to a kind of electrohydraulic proportion variable axial plunger pump.

Technical background

In hydraulic system, electrohydraulic proportion variable axial plunger pump is active in one's movements the repeatability height because of controlling flexibly, good stability, and application is more extensive, and used electrohydraulic proportion variable axial plunger pump all is to utilize the external control oil pump to control its variable at present, and the hydraulic power of a cover hydraulic system as the control pump variable promptly arranged in addition, it is this that to come the deficiency of control pump variable with the external control oil pump be that consumes energy is big, the cost height, complex process, application area is little.

Summary of the invention

The purpose of this utility model is to overcome the deficiency that present electrohydraulic proportion variable axial plunger pump utilizes the external control oil pump to come the control pump variable, provides a kind of pressure oil that utilizes the oil outlet of pump place own to control the internal controlling electrohydraulic proportion variable axial plunger pump of this pump variable after reducing pressure.

The purpose of this utility model is achieved through the following technical solutions, the internal controlling electrohydraulic proportion variable axial plunger pump partly is made up of main body and variable, main body is by the pump housing 22, pump case 18, oil distribution casing 21, transmission shaft 23, housing assembly 25, central spring 24, interior cover 20, steel ball 19, backhaul dish 26, a plurality of plungers 27, form with piston shoes 28, transmission shaft 23 is contained in the pump housing 22 by the bearing transition, housing assembly 25 is contained in the pump case 18, housing assembly 25 is used splined with transmission shaft 23, one end of pump case 18 and the pump housing 22 usefulness bolts link, oil distribution casing 21 is contained in 22 of housing assembly 25 and the pump housings, a plurality of plungers 27 are contained in the cylinder hole of housing assembly 25, it is free to rotate that piston shoes 28 wrap the ball head that is locked in plunger 27, central spring 24 is contained in the hole of transmission shaft 23 terminations, through interior cover 20 steel ball 19 is withstood on the backhaul dish 26, piston shoes 28 are enclosed within the hole on the backhaul dish 26; Variable is partly by variable shell 5, variable piston 4, variable head 16, thrust plate 17, proportion electro-magnet 10, pilot valve 9, valve pocket 8, big spring 6, little spring 7, valve flange 11, valve piece flange 2, inner spring seat 14, power spring seat 12 and bearing pin 15 are formed, variable piston 4 is contained in the variable shell 5, pilot valve 9 is contained in the valve flange 11 after being contained in the valve pocket 8, valve flange 11 times and variable shell 5 link, last and proportion electro-magnet 10 links, be enclosed within on the little spring 7 on the power spring seat 12, under be enclosed within on the inner spring seat 14, power spring seat 12 upper ends and valve pocket 8 link, link with valve flange 11 on the big spring 6, following and variable piston 4 links, valve piece flange 2 is contained in the lower end of variable shell 5, variable head 16 and variable piston 4 link by bearing pin 15, the other end of pump case 18 and variable are partly gone up variable shell 5 and are linked on the main body, thrust plate 17 is installed on the variable head 16 by bearing pin 15, piston shoes 28 are under central spring 24 effects, be pressed on the thrust plate 17, reduction valve 1 is equipped with in the lower end of valve piece flange 2, this reduction valve can be bought stock according to the needs of decompression on market, the oil inlet P of reduction valve 1 and the oil outlet a on the main body communicate, and the return opening O of reduction valve 1 and the filler opening on the main body communicate.

The external control oil pump control electrohydraulic proportion variable axial plunger pump that utilizes of the utility model and present use is compared, and has energy saving, reduces cost, advantages such as technology is simple, applied range.

Description of drawings

Accompanying drawing 1 is a structural representation of the present utility model, and Fig. 2 is the left view of Fig. 1, and Fig. 3 is the enlarged view at the J position of Fig. 1.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail.In the accompanying drawing: 1-reduction valve; 2-valve piece flange; 3-shift fork; 4-variable piston; 5-variable shell; 6-big spring; 7-little spring; 8-valve pocket; 9-pilot valve; 10-proportion electro-magnet; 11-valve flange; 12-power spring seat; 13-plug; 14-inner spring seat; 15-bearing pin; 16-variable head; 17-thrust plate; 18-pump case; 19-steel ball; 20-interior cover; 21-oil distribution casing; 22-pump housing; 23-transmission shaft; 24-central spring; 25-housing assembly; 26-backhaul dish; 27-plunger; 28-piston shoes.

Motion conditions of the present utility model is, the transmission shaft 23 of pump is rotated by driven by motor, transmission shaft 23 is used splined with housing assembly 25, drive housing assembly 25 rotations, the a plurality of plungers 27 that are distributed on the housing assembly 25 are rotated around the center line of transmission shaft 23, it is free to rotate that piston shoes 28 wrap the ball head that is locked in plunger 27, central spring 24 is pressed in piston shoes 28 on the thrust plate 17 that becomes certain angle of inclination with axis by interior cover 20, steel ball 19, backhaul dish 26, and this thrust plate 17 is that the center floating ground is installed on the variable head 16 with bearing pin 15.When housing assembly 25 rotations, a plurality of 27 whiles of plunger are reciprocating, finish oil suction and press the oil action.

Working principle of the present utility model is: when proportion electro-magnet 10 input currents are zero, pilot valve 9 is pulled to upper end position under the effect of the elastic force of little spring 7, this moment, hyperbaric chamber fluid (made reduction valve be controlled at the Variable Control pressure stability at 2～7.5MPa from a mouth by the oil inlet P mouth that inclined hole b enters reduction valve 1, reduction valve return opening O gets back to the oil pump filler opening from the oil pump inner chamber), again on the A mouth of reduction valve 1 and slotted hole c entering variable piston 4, cavity of resorption, because the area of epicoele f is greater than the area of cavity of resorption g, variable piston 4 is pushed to upper/lower positions, the drift angle minimum of variable head 16 (2 °) (giving small flow) to guarantee Variable Control pressure.When proportion electro-magnet 10 input currents increase, pilot valve 9 moves down under proportion electro-magnet 10 electromagnetic forces promote, thereby the last valve port of pilot valve 9 is opened, variable piston 4 epicoeles are connected by control mouthful d and oil back chamber e, the pressure of epicoele f reduces, variable piston 4 moves up, the drift angle of variable head 16 increases, pump delivery also increases thereupon, displacement with variations per hour piston 4 acts on the pilot valve 9 by compressed feedback little spring 7 again, shift pilot valve 9 onto equilibrium position, variable piston 4 promptly maintains a certain definite equilibrium position, and pump delivery also maintains certain certain value.Otherwise, when proportion electro-magnet 10 input currents reduce, pilot valve 9 moves up under the effect of feedback little spring 7, the valve opening that leads to oil back chamber e is reduced, the pressure of epicoele f increases, and variable piston 4 moves down, when electromagnetic force equals to feed back the spring force of little spring 7, pilot valve 9 is got back to the equilibrium position again, and variable piston 4 is balance on a new position again.The size of proportion electro-magnet 10 input currents as required can be artificially or computer control, so moves in circles and realize the internal control electrohydraulic proportion variable.

Claims (1)

1. internal controlling electrohydraulic proportion variable axial plunger pump of partly forming by main body and variable, main body is by the pump housing (22), pump case (18), oil distribution casing (21), transmission shaft (23), housing assembly (25), central spring (24), interior cover (20), steel ball (19), backhaul dish (26), a plurality of plungers (27), and piston shoes (28) are formed, transmission shaft (23) is contained in the pump housing (22) by the bearing transition, housing assembly (25) is contained in the pump case (18), housing assembly (25) is used splined with transmission shaft (23), one end of pump case (18) and the pump housing (22) link with bolt, oil distribution casing (21) is contained between the housing assembly (25) and the pump housing (22), a plurality of plungers (27) are contained in the cylinder hole of housing assembly (25), piston shoes (28) bag is locked in the ball head of plunger (27), central spring (24) is contained in the hole of transmission shaft (23) termination, through interior cover (20), steel ball (19) withstands on the backhaul dish (26), and piston shoes (28) are enclosed within the hole on the backhaul dish (26); Variable is partly by variable shell (5), variable piston (4), variable head (16), thrust plate (17), proportion electro-magnet (10), pilot valve (9), valve pocket (8), big spring (6), little spring (7), valve flange (11), valve piece flange (2), inner spring seat (14), power spring seat (12) and bearing pin (15) are formed, variable piston (4) is contained in the variable shell (5), pilot valve (9) is contained in the valve flange (11) after being contained in the valve pocket (8), valve flange (11) descends and variable shell (5) links, last and proportion electro-magnet (10) links, be enclosed within on the little spring (7) on the power spring seat (12), under be enclosed within on the inner spring seat (14), power spring seat (12) upper end and valve pocket (8) link, big spring (6) is gone up and valve flange (11) links, following and variable piston (4) links, valve piece flange (2) is contained in the lower end of variable shell (5), variable head (16) and variable piston (4) link by bearing pin (15), variable shell (5) on the other end of pump case on the main body (18) and the variable part links, thrust plate (17) is installed on the variable head (16) by bearing pin (15), piston shoes (28) are pressed on the thrust plate (17) under central spring (24) effect; Reduction valve (1) is equipped with in the lower end that it is characterized in that valve piece flange (2), and the filler opening (P) of reduction valve (1) and the oil outlet (a) on the main body communicate, and the return opening (O) of reduction valve (1) and the filler opening on the main body communicate.