SU1041739A1 - Axial-plunger controlled pump - Google Patents

Description

A:} s The invention relates to a hydraulic engineering device and can be used, for example, in machine tools, hydraulic equipment, hydraulic actuators of aircraft, and other devices of control systems. An axial-piston regulating pump with a servo-mechanism containing a cylinder of control, with pistons, installed in the inner cavity of the housing, a cradle and a block of pistons mounted on the bearing washer are known, the latter having two symmetric arcuate pairs connected with working chambers, and in the block of pistons there are arc-shaped grooves with through, openings placed with the possibility of interaction. with grooves fl. The disadvantages of this pump are the low cavitational characteristics of the pump and incomplete filling of the working chambers, as a result of which the air plug is inserted into the pressure line, which leads to the erosion destruction of the pump parts. The purpose of the invention is to improve the cavitation performance by increasing its suction capacity, as well as improving the dynamic performance. This goal is achieved by the fact that in an axial-piston-controlled pump with a servo-mechanism of control, comprising a cylinder block with pistons, installed in the internal cavity of the housing, a cradle and a block of pistons mounted on the support washer, and on the latter. Two symmetrical arcuate grooves associated with working chambers and, in the piston block, arcuate grooves with through holes, arranged to interact with the grooves of the bearing washer, the support washer is installed in the cradle, and one of the grooves is connected by a radial groove to the internal cavity of the building The arcuate grooves are connected with the working chambers of the pump in the form of through axial channels located in the pistons and communicating with the working chambers and through the piston block. FIG. 1 shows axially; piston pump, longitudinal section; in fig. 2 is a view of the working end 392 of the piston block in FIG. 3 view of the working end of the bearing washer. A drive shaft with a cardan 4, a finger 5, a spherical bushing 6 and a spring 7 is mounted in the housing 1 in radial bearings 2. In the inner cavity 8 of the housing 1 there is a block of 9 cylinders with pistons 10 having through axial channels 11, an end distributor 12, a block 13 pistons, in which the rods} of pistons 10 are hinged. On the support washer 15 there are two symmetrical arcuate grooves 16 and 17 connected to the working chambers 18, and in the block 13 of the pistons arcuate grooves 19 with through holes 20. The groove 16 is connected radial flow 21 with internally cavity 8 of the housing 1. The cradle 22 with the bolt 23 is movably connected to servo 2k, in the cylinder block 9 there is a suction box 25 and the conveyor box. The drive shaft 3 transmits the torque to the cylinder block 9 through the pin 5 and the piston block 13 via the power cardan. Since the axes of the shaft 3 and the cradle 22 are at a certain angle, made using the servo-mechanism 2k, the rods 14 with the pistons 10 reciprocate in the rotating cylinder block 9. During suction, the working fluid enters the chamber 18 through the suction port 25 of the cylinder block 9 and the groove 26 of the front distributor 12 from the supply line and through the suction groove 21 and the arc-shaped grooves 16 of the bearing washer 15 and the groove 19 of the piston 13 from the cavity 8. Additional filling with working fluid suction chambers through the axial channel of the rods and pistons from the internal cavity of the housing improves the cavitation characteristic of the pump. Upon further rotation of the shaft 3, the working fluid is pushed through the forcing window of the mechanical distributor into the supply line, at the same time the fluid from the chamber 18 under pressure enters the grooves 9 into the grooves 9, providing hydrostatic discharge of the piston block, and into the arc-shaped groove 17, providing hydrostatic balancing of the cradle 22.

j: 10417394

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The use of the proposed pump. and provides a hydrostatic improves the cavitation characteristics of the unloading of the block of pistons, which improves by increasing its suction method dynamic characteristic of the pump.

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Claims (1)

AXIAL-PISTON CONTROLLED PUMP with a servo control mechanism, comprising a cylinder block with pistons installed in the internal cavity of the housing, a cradle and a piston block mounted on a support washer, the latter having two symmetric arcuate grooves connected to the working chambers, and in the piston block - arcuate grooves ςο through holes, placed with the possibility of interaction with the grooves of the support washer, characterized in that, for the purpose. improving cavitation characteristics by increasing its absorption capacity, as well as improving dynamics. According to its characteristic characteristics, the support washer is installed in the cradle, and one of the grooves is connected by a radial groove with the internal cavity of the housing, and the connection of the arcuate grooves with the working chambers of the pump is made in the form of through axial channels located in the pistons and communicated with the working chambers and through holes of the piston block .. -