JPS60159380A - Radial piston machine - 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 Field of Industrial Application The present invention provides a cylinder body supported on a control journal having a number of substantially radially disposed holes, each of which is provided with a discharge piston for sliding therein. and is supported by sliding pieces that move on the inside of the cam ring, and these sliding pieces are held in position by at least one holding ring provided on the side thereof, and the outer periphery of this holding ring is also connected to the cam ring. Concerning a radial piston machine, which is in contact with the inside of the

Problems with the Prior Art In such known radial piston machines, the outer periphery of the retaining ring lies completely on the inside of the cam ring, so that no pressure medium can escape through the outer periphery into the interior of the machine. This has the disadvantage that it is impossible or very difficult to wash out the dirt particles that get into the pressure medium due to wear, so that there is a risk of the sliding piece getting seize up.

Solution to the problem In order to eliminate this drawback, according to the invention, a plurality of axially extending channels are formed on the outer periphery of the retaining ring, via which a connection to the interior space of the machine takes place.

Effects of the Invention The radial biston machine according to the invention has the advantage that the pressure medium and the dirt particles contained therein pass through the passage into the interior of the housing and from there to the container, where they are removed by a filter during re-intake. There is. As a result, the machine failure rate is significantly reduced.

Advantageous developments of the features listed in the patent claim are possible by means of the measures listed in the experimental aspect of the patent claim. These features consist, for example, in the passages which are particularly advantageously formed by the profile cutting tool.

Embodiments An embodiment of the invention is shown in the drawings and will be described in detail below.

The radial piston pump has a flange-shaped housing l which is closed by a housing lid 2. Hole 3 from the end of the housing 1 that is farthest from the housing lid 2
emerges and opens into a generally oblong recess 4 forming part of the interior of the housing. A portion of the length of the control journal 5 pushed into the hole 3 projects into the recess 4 . A cylinder body 6 is provided in the recess 4 and is rotatably supported on the control journal 5 by a bore 6', and in a radially extending bore 7 a piston 8 is accommodated. This piston 8 has a sliding piece 9
is supported by the guide surface 10 inside the cam ring 11. If the pump is of variable construction, a cam ring 11 is provided in the recess 4 so as to be displaceable in the circumferential direction in order to vary the piston stroke. There are retaining rings 12 on both sides of the base of the sliding piece 9.
．． 13, which keeps the sliding piece 9 in constant contact with the guide surface of the cam ring II. For this purpose the projecting annular edge 12' of the retaining ring 12.13.

13' extends slightly above the base of the sliding piece 9.

Since the outer periphery of the retaining ring 12 is formed with arcuate ridges 21 and 5 at equal intervals, an axial passage 22 is created between these ridges. The protuberance 21 is in contact with the guide surface 10 of the cam ring 11 at its outer periphery. A radial groove 24 communicating with the passage 22 is formed in the end face of the retaining ring 12 . The retaining ring 13 is also constructed in exactly the same way. Cylinder body 6 and retaining ring 1
A plurality of narrow longitudinal grooves 25 are formed on the side of the housing 1 that is closer to the housing 2 and extend into the self-contained journal and thus into the interior of the housing. A plurality of extremely short vertical grooves 26 are also formed inside the lid 2 on the side closer to the cylinder body 6.
Similarly, it passes inside the housing. As a result, a pressure medium connection is established from the sliding piece 9 via the retaining ring 12, 13 into the housing interior, so that dirt particles in the area of the sliding piece 9 are flushed out into the housing interior. From there the dirt particles reach the container and are retained within the filter. As a result, almost no dirt particles reach the base of the sliding piece 9.
Seizure of the sliding piece can be prevented and the life of the pump can therefore be significantly improved.

Two control openings 14 , 15 diametrically opposed to each other are formed in the control journal 5 and cooperate with the outlet of the cylinder bore 7 , each extending partly into the housing 1 and partly into the control journal 5 . It opens into one pressure medium inlet or outlet channel 16,17. The two control openings 14.15 are separated from each other by a nuchal bulge 18.19. An annular groove 2o is formed in the control journal 5, such that when the control journal is pushed into the hole 3, this annular groove 20 is located where the hole 3 transitions into the recess 4. A vertical groove 25 also communicates there.

A modification of the retaining ring is shown in FIG. This retaining ring, designated 23, has a polygonal contour on its outside. This results in a number of passages along the guide surface of the cam ring.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of the radial piston pump, Fig. 2 is a front view of its retaining ring, and Fig. 3 is a section III-III in Fig. 2.
A sectional view taken along the line, and FIG. 4 is a front view of a modification of the retaining ring. 5... Control journal, 6... Cylinder body, 7...
・Hole, 8...Piston, 9...Sliding piece, lO...
Inside (guide surface), 11...cam ring, 12.13...
Retaining ring, 22... passage

Claims (1)

[Claims] 1. A cylinder body (
3) has a plurality of holes (7) provided approximately in the radial direction, and a discharge piston (8) is provided in each of these holes (7) so as to slide therein, and the discharge piston (8) is provided on the inside (10) of the cam ring (11). These sliding pieces (9) are supported by sliding pieces (9) that move.
at least one retaining ring (12
, 13), and this retaining ring (12
, 13) are also in contact with the inner side (10) of the cam ring (11), and a plurality of passages (22) extending in the axial direction are formed on the outer periphery of the retaining ring (12, 13). Radial piston machine, characterized in that the connection to the internal space of the machine is made via (22). 2 The passageway (22) is an arcuate ridge (21) on the outer periphery of the retaining ring.
) Claim 1, characterized in that the holder @ (23) is formed with a polygonal outer periphery. Machines listed in Section. 4 A radial groove (24) is formed on the end surface of the retaining ring,
4. Machine according to claim 1, characterized in that it opens into a passageway (22). 5. Machine according to any one of claims 111 to 4, characterized in that a retaining ring is provided on each side of the sliding piece (9). 6 Housing (1) closer to the cylinder body (6)
Machine according to claim 1, characterized in that longitudinal grooves (25, 26) are formed on the sides, which longitudinal grooves lead from the passage (22) into the interior of the machine. 7. Machine according to any one of claims 1 to 5, characterized in that the retaining ring is made of plastic, in particular of polyamide.