SU922306A1 - Axial piston pump - Google Patents

Description

(5) AXIAL PISTON PUMP

I

The invention relates to the field of pump construction.

An axial-piston pump is known, comprising a housing with a drive shaft, a cylinder-mounted unit mounted on the housing. articulated with the drive shaft and interacting with the pistons.

In a known pump, a leak from under the pistons penetrates into the crankcase, lubricates the loaded moving parts of the drive and is discharged into the tank in the form of a drain. When the drive shaft is rotated, the rocker alternately acts on the pistons, pushing them inside the cylinder block and, through the discharge valves, pumps working fluid into the pressure manifold, which has an outlet to the pressure line.

Pistons pushing out (suction) is performed by the low pressure of the booster pump, whose head is connected to the suction manifold, from where fluid flows through the suction valve into the piston chamber. The presence of pistons in combination with valve distribution allows the pump to develop a high pressure 1.

However, increasing the life of such a pump is limited by the strength and low life of the spherical joint. The increase in the spherical hinge of the diameter of the ball is limited by the permissible sliding speeds of the pair of the ball - bow.

The purpose of the invention is to increase the pump life.

20

The goal is achieved by the fact that the spherical hinge of the pump is provided with a discharge piston and a shoe interconnected in

spherical hinge and ball. Boreholes are made in which a piston and a shoe are installed, respectively, the piston is hydraulically connected to the discharge manifold and contacts the shoe in the center of the spherical hinge.

The drawing shows the pump, a longitudinal section.

The axial piston pump includes a housing 1 in which a drive shaft 3 is mounted on bearings 2.

The cylinder block J has an axial bore 5, which is an oil crankcase in which the rocking washer 6 is placed, supported on a spherical hinge; including ball 7, thrust 8, and thrust 9.

8, a pressure valve 10 is built in by the cylinder block; a channel 11 is connected to the discharge manifold 12 and has an outlet to the discharge line 13. The suction valve H is also integrated in block k, 4th with the intake manifold 15 having a fitting 16, for connection to the feed pump shown).

In the axial bores 17 of the block C of the cylinders, the pistons 18 are installed. The bores 17 by the channels 19 and 20 are connected to the discharge 10 and the suction 1 valves.

The oil casing is insulated from the external environment by a cover 21. The axial piston pump is equipped with a unloading mechanism, made in the form of a piston 22 installed in the sub-element 8, and a shoe 23 installed in the internal bore 2 of the ball 7, and center swing spherical hinge. The piston 22 channel 25 is connected to the discharge manifold 12.

During the rotation of the drive shaft 3, the pressure from the washer 6 alternately acts on the pistons 18, pushing them in. into cylinder block k, as a result of which they inject high-pressure working fluid through channels 20 and 19, pressure injection valves 10, channels 11 and pressure manifold 12, from where it is directed through outlet 13 to the hydraulic line of the hydraulic system (not shown). Pistons 18 (suction) are ejected by the pressure of a booster pump (not shown), which pumps the working fluid under low pressure into the intake manifold 15 through fitting 16. When

the suction of the working fluid through the suction valves C, channels 19 and 20 goes to the pistons 18.

When the pump is operated, the forces of the pistons are transmitted through the fungal part of the swinging washer 6 to the ball 7, which is supported in the recess 8. Part of the force is compensated by the opposition of the unloading mechanism consisting of the piston 22 and the shoe 23.

The unloading mechanism works in the following way.

The working fluid under pressure from the pump through the channel 25 acts on the piston 22, which is supported on the shoe 24.

Thus, the part of the load acting on the spherical hinge is perceived by the unloading mechanism, leaving only that part on which the work of the spherical hinge is designed for the ball and the base plate.

The contact of the piston and the shoe is made in the center of the spherical hinge swing (without taking into account the tolerances on manufacturing accuracy). This allows you to exclude

friction and slip at the point of contact.

Since the cost of manufacturing the spherical hinge unloading mechanism is insignificant, and the increase

resource is possible not less than 1.5 times, then the feasibility of introducing such a mechanism for unloading is obvious.

Claims (1)

Invention Formula An axial piston pump comprising a housing with a drive shaft, a cylinder block with a piston, suction and discharge manifolds and valves mounted on the housing, and an axial bore that houses the scraper with a washer mounted on a spherical hinge containing  a ball and a ball articulated with the drive shaft and interacting with the pistons, distinguishing c. the fact that, in order to increase the pump life, the spherical The Si hinge of the pump is equipped with a discharge piston and a shoe interconnected; bores are made in the stopper and the ball of the spherical hinge. 5,922,306 " in which sources of information are respectively installed the piston and the shoe, and the piston is taken into account during the examination hydraulically connected to the supercharger-1..Bashta T.M. Volumetric pumps n1 | m collector and is in contact with the bash and hydraulic motors. M., poppy seeds in the center of the spherical swing 5 Mashinostroenie, E7, p.250, hinge. rice 2