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Tooth set for a hydraulic machine

Imported: 24 Feb '17 | Published: 06 Jan '04

Axel Patsch, Tage Christiansen, Hans Christian Petersen, Jørgen Pedersen

USPTO - Utility Patents

Abstract

The invention concerns a tooth set for a hydraulic machine, particularly a steering unit, with a toothed ring, having teeth, which are formed by means of inserts arranged in a housing, and a gear wheel arranged inside the toothed ring. It is endeavoured to simplify the production of such a tooth set. For this purpose, each inset (

10) has, at least at its ends, a plate-like shape and the ends are fixed in the housing (

11) in corresponding slots (

17, 18).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

In the following, the invention is described in detail on the basis of preferred embodiments in connection with the drawings, showing:

FIG. 1 a schematic view of a tooth set

FIG. 2 a section of a toothed ring of the tooth set

FIG. 3 a perspective view of a tooth according to FIG. 2

FIG. 4 a section IV—IV according to FIG. 3

FIG. 5 a top-view of the tooth

FIG. 6 a perspective view of a modified embodiment

FIG. 7 a section VII—VII according to FIG. 6

FIG. 8 a top view of a tooth according to FIG. 6

FIG. 9 a further embodiment

Claims

1. A tooth set for a hydraulic machine having a steering unit, and with a toothed ring having teeth, which are formed by inserts having ends arranged in a housing, and a gear wheel arranged inside the toothed ring, characterised in that at least the ends (

26,

27) of each insert (

10,

22) having a plate-like shape with the ends (

26,

27) being fixed in corresponding slots (

17,

18;

28,

29) in the housing (

11,

11′,

30).

2. A tooth set according to claim 1, characterised in that the insert (

10) is made of a bent plate.

3. A tooth set according to claim 2, characterised in that at each insert the housing (

11) has a radially inward projecting boss (

9), which fills a space surrounded by the bent plate (

10).

4. A tooth set according to claim 2, characterised in that a gap exists between the bent plate (

10) and the housing (

11′).

5. A tooth set according to claim 4, characterised in that a housing-side limiting wall of the gap is formed by a circumferential cylinder surface, whose diameter corresponds to an inner diameter of the housing (

11′).

6. A tooth set according to claim 4, characterised in that the gap is filled with a compressible material (

21).

7. A tooth set according to claim 1, characterised in that the insert (

10,

22) is made of spring steel.

8. A tooth set according to claim 1, characterised in that the slots (

17,

18;

28,

29) are directed so that they form a predetermined angle to the radial direction (

19).

9. A tooth set according to claim 1, characterised in that the insert (

22) is made of a profile, whose cross section is formed by the combination of a circle section (

24) and an oppositely bent rid (

23), which projects sideward over the circle section (

24).

10. A tooth set according to claim 9, characterised in that the surface of the circle section (

24) is hardened.

11. A tooth set according to claim 1, characterised in that the inserts (

10,

22) project axially over a front side of the inserts, and the front side is covered by a plate (

12,

13), which has openings (

14,

15) corresponding to the inserts.

12. A tooth set according to claim 11, characterised in that the depth of the openings (

14,

15) is larger than the projecting of the inserts (

10).

13. A tooth set according to claim 1, characterised in that in relation to the bearing surface (

16), the housing (

11,

11′) is made of a soft material.

14. A tooth set according to claim 1, characterised in that the surface of the teeth is smoothened in parallel to the movement direction of the gear wheel (

3).