JPS6263185A - Radial piston pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] "Technical field of invention" The present invention relates to a radial piston pump.

TECHNICAL BACKGROUND OF THE INVENTION AND PROBLEMS THEREOF To supply the high pressures necessary to hydraulically actuate braking devices, in particular the compact and fully complete anti-skid braking systems on the market today. A radial piston pump is used. Up to now, in the case of radial piston pumps for this purpose, the pressure difference between suction pressure and pump pressure significantly improves efficiency. As a result, supercharging suction pressure is output. Here, a radial piston pump is known from West German Patent Publication No. 3431158, and in the case of this radial piston pump, there is a gap between the bottom surface of a pot-shaped recess and the front surface of the rotor in this recess. is formed with an annular chamber.

This annular chamber is radially divided by the circumferential surfaces of the rotor and stator.

A bottle-shaped damming element, which is arranged parallel to the annular chamber, projects from the annular chamber.

The diameter of this weir element is matched to the radial cross-sectional area of the annular chamber. A connecting opening is provided in front of the damming element, which connecting opening is connected to the inflow channel.

This type of arrangement of damming elements naturally results in relatively strong torsion, which eliminates the contribution of static pressure.

OBJECT OF THE INVENTION The object of the invention is to provide a radial piston pump capable of obtaining a supercharging increase in static pressure.

"Summary and Effects of the Invention" The above object is achieved by the characteristic parts of the claims of this invention.

Due to the eccentrically formed suction chamber, in the first stage,
The accelerated fluid is forced to accumulate, thereby achieving a reliable dynamic pressure and a high boost pressure for known devices. This achieves high efficiency for supercharging. This advantageous configuration makes it possible to dispense with a hole requiring a damming element and the necessary assembly for this hole.

In an advantageous embodiment, its use makes it possible to create pores, the size of the cross-sectional area of which can positively influence the dynamic pressure surface.

In another embodiment, the flow channel is connected to a groove arranged axially on the drive shaft, which groove ensures a connection with the suction kiln below the piston.

Embodiments of the Invention The spherical piston pump shown in FIG. 1 is equipped with a closed deep pot-shaped housing 1 on its front side. This housing 1 is attached via a flange to a drive device, which is not shown in detail. The housing 1 has a suction connection 2 and a pressure connection, not shown in detail, which is connected into the collecting chamber 3 .

Inside the housing 1, a unit consisting of a rotor and a stator is arranged. This unit has a housing l
It is supported via a supporting member 4, such as an O-ring, which provides a masculine seal. The unit basically consists of an outer stator 5 and a cylindrical low tough placed in a dish-shaped recess 12 of the stator 5. The stator 5 is held with respect to the housing l via a support bin 6, with its rotation being prevented.
are arranged in holes formed in the front surfaces of the stator 5 and the housing l, respectively.

The rotor 7 has a central journal 20 projecting into the recess 12.
This central journal 20 is, on the other hand, held in the bore of the stator 5 . An inlet passage 21 and an outlet passage 22 extend within the central journal 20 . A cylinder hole 14 that penetrates in the radial direction is formed in the rotor 7, and a spherical piston 10 is disposed in a diametrically opposed portion of the cylinder hole 14 so as to be movable in the radial direction. .

The spherical piston 10 consists of two parts: a radially outwardly arranged ball 15 and a radially innerly arranged bush-shaped piston element 25 . Ball 1
5 and the piston element 25 slide within the cylinder bore 14 and are relatively movable. The inflow passage 21 and the outflow passage 22 can be connected to the inner chamber of the cylinder hole 14 by rotation of the rotor 7 .

In the recess 12 of the stator 5, a lift ring 8 with a sliding surface 9 for a spherical piston 10 is arranged eccentrically with respect to the central journal 20. This ring 8 includes a cylindrical member 30 consisting of a roller, a support ring 31 rotatably disposed within the stator 5 and the housing 1.
It is attached via. Ball 1 of spherical piston lO
5 is capable of sliding on a sliding surface 9 of an eccentrically arranged ring 8 when the rotor 7 is rotating. Due to the shifting movement on the ring 8 in the cylinder bore 14, the sliding of the ball 15 in the spherical piston 10 is difficult;
Due to the action of the rolling bearing, the ring 8 can rotate and rotates essentially synchronously with the rotor 7. At this time, the ball 15 does not move on the ring 8.

An annular working chamber 17 is eccentrically formed between the sliding surface 9 of the ring 8 and mutually opposing portions of the outer circumferential surface of the rotor. The size of the radial cross-sectional area of this working chamber 17 changes along the circumferential direction. The portion of the rotor that protrudes from the recess 12 is held by a closing disk 11, which closes the pot-shaped recess 12 of the stator 5 from the axial direction, except for the suction port 13.

Between the bottom surface of the pot-shaped recess 12 and the front surface of the rotor 7 within the recess 12, there is an annular chamber 1 that is offset with respect to the axis of the
6 is formed. This annular chamber 16 has, in the radial direction,
It is divided by the circumferential surfaces of the rotor 7 and the stator 5. The annular chamber 16 is the working chamber 1 between the sliding surface 9 and the rotor 7.
7 via a recess 18. An annular chamber 16 is formed eccentrically, and this annular chamber 16 is located in the stator 5.
The annular chamber 16 is formed by an eccentric space, and a hole 19 is formed in the front of the narrow part of the annular chamber 16. This hole 19 is connected to an inlet channel 21 via a connecting opening 28 .

The rotor 7 is connected to the end of a connecting shaft 24 of the drive device via a spring joint 23 that is elastic in the axial and torsional directions.

The radial piston pump of FIGS. 1 and 2 has a total of three pump stages. Firstly, in the two pump stages, the supercharging of the hydraulic medium flowing into the suction connection 2 is caused by the supercharging pressure. This supercharging pressure is supplied under the pressure of the high pressure stage. The spherical piston 10 sliding in the rotor cylinder bore 14 creates a pressure increase in the high pressure stage.

The working chamber 17 in the first supercharging stage is located between the sliding surface 9 and the outer peripheral surface of the rotor 7, and the working chamber 17 is divided by a ball 15 protruding from the outer peripheral surface of the rotor 7.

The working chambers 17 of the two following supercharging stages are eccentrically formed annular chambers 16, which have a partially exposed hole 19 in their narrow region.

When the sphere and the sun bomb are being driven, the working medium from the suction port 2 flows through the suction port 3 into the working chamber 17 of the jump between the outer peripheral surface of the rotor and the sliding surface 9. When the rotor 7 is rotating, the working fluid flows into the annular chamber 16 under pressure increase based on the change in volume.
is pushed out through the recess 18 of. Through the rotation of the rotorf, a stable change in the fluid cross-section and an increase in its flow velocity are achieved. By being confined within the region 26, the working medium will be forced to accumulate and flow out via the holes 19. Here, the working fluid has a supercharging pressure and is transmitted via the connection opening 28 to the inflow channel 21 in the central journal 20 and, in a predetermined rotational range, to the inflow of the central journal 20. It flows through the passage 21 into the high-pressure working chamber of the cylinder hole 14 in the rotor 7 .

After the rotor 7 has been rotated through a predetermined range, the high-pressure working chamber is connected to the outflow passage 22 of the central journal 20 and to the connecting passage 27 arranged in the stator 5.
It is connected to the collecting chamber 3 between the stator 5 and the housing 1 via the collecting chamber 3, where the pressure connection is finally terminated.

When the pump is driven, the rotor 7 moves into the annular chamber 16
Due to the pressure transmitted therein, the rotor is pressed in the axial direction against the spring joint 23, which has elasticity in the axial direction and exerts a biasing force on the rotor, and does not abut against the stator 5.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the radial piston pump, and FIG. 2 is a cross sectional view of the radial piston pump. 5... Stator, 7... Rotor, 16... Annular chamber, 19... Hole, 21... Passage, 2
8...Connection opening.

Claims (2)

[Claims] 1. In the rotor, at least one piston is disposed eccentrically with respect to the drive shaft and movable by suction within the cylinder hole, and an annular chamber is formed to obtain higher supercharging pressure to the rotor and the stator. In the radial piston pump, the annular chamber (16) formed by the rotor (7) and the stator (5) is provided eccentrically with respect to the axis of the rotor (7), and the eccentric annular chamber (16) is its connection aperture (
A radial piston pump, characterized in that it is connected to the high-pressure working chamber of the radial piston pump via a passage (28) and a passage (21). 2. Radial piston pump according to claim 1, characterized in that the connection between the eccentric annular chamber (16) and the connection opening (28) is formed via a bore (19). .