Method for Producing a Housing, and Shell Housing and Housing for a Rotary Piston Engine

Abstract

A method for producing a housing for a rotary piston engine, a shell housing, and a housing for a rotary piston engine, are disclosed. A bushing of hard metal is pressed into a shell housing main body with a trochoidal raceway in such a manner that an external circumferential contour of the bushing bears in a sealing manner on the trochoidal raceway and the trochoidal raceway is cladded via the bushing.

Claims

1. A method for producing a housing for a rotary piston engine, comprising: providing a shell housing main body with a trochoidal raceway; press-fitting a bushing of hard metal into the shell housing main body such that an external circumferential contour of the bushing bears in a sealing manner on the trochoidal raceway and the trochoidal raceway is cladded via the bushing.

2. The method according to claim 1, wherein the bushing has an initial shape with an oval circumferential contour, and a force is applied to the bushing when press-fitting so that the bushing is elastically deformed and the circumferential contour bears in the sealing manner on the trochoidal raceway.

3. The method according to claim 1, further comprising: replacing the bushing when the bushing is damaged or worn.

4. The method according to claim 1, wherein the shell housing main body is of aluminum or an aluminum alloy and manufactured by an aluminum die-casting method.

5. The method according to claim 1, wherein the housing has two lateral parts which are disposed on both sides of the shell housing, and a slide plate of hard metal is provided in each case between the two lateral parts and the shell housing.

6. A shell housing for a rotary piston engine, comprising: a shell housing main body with a trochoidal raceway; a bushing of hard metal pressed into the shell housing main body such that an external circumferential contour of the bushing bears in a sealing manner on the trochoidal raceway and the trochoidal raceway is cladded via the bushing.

7. The shell housing according to claim 6, wherein the bushing has an initial shape with an oval circumferential contour, and the bushing is elastically deformed for bearing in the sealing manner on the trochoidal raceway.

8. The shell housing according to claim 6, wherein the shell housing main body is of a light metal.

9. The shell housing according to claim 8, wherein the light metal is aluminum or an aluminum alloy.

10. The shell housing according to claim 6, wherein the bushing is received in the shell housing main body so as to be replaceable without destroying the shell housing main body.

11. A housing for a rotary piston engine, comprising: a shell housing comprising a shell housing main body with a trochoidal raceway, and a bushing of hard metal pressed into the shell housing main body such that an external circumferential contour of the bushing bears in a sealing manner on the trochoidal raceway and the trochoidal raceway is cladded via the bushing; a lateral part; and a slide plate of hard metal, wherein the slide plate is disposed between the lateral part and the shell housing.

12. The housing according to claim 11, wherein the lateral part and the shell housing have mutually facing planar surfaces on which the slide plate bears.

13. The housing according to claim 11, wherein the slide plate has a material thickness of approx. 0.8 mm to approx. 2.4 mm.

14. The shell housing according to claim 11, wherein the bushing has an initial shape with an oval circumferential contour, and the bushing is elastically deformed for bearing in the sealing manner on the trochoidal raceway.

15. The shell housing according to claim 11, wherein the shell housing main body is of a light metal.

16. The shell housing according to claim 11, wherein the bushing is received in the shell housing main body so as to be replaceable without destroying the shell housing main body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG. 1 shows a housing of a rotary piston engine, comprising a shell housing, two lateral parts, and two slide plates, in a lateral view; and

[0027] FIG. 2 shows the shell housing according to FIG. 1 and a rotor arranged therein, in a perspective frontal view.

DETAILED DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 shows a housing of a rotary piston engine, comprising a shell housing 3, two lateral parts 4, and two slide plates 5 which are disposed between the shell housing 3 and the lateral parts 4, in a lateral view. The lateral parts 4 and the shell housing 3 in the exemplary embodiment illustrated have mutually facing planar surfaces, the slide plates 5 bearing in each case on the planar surfaces of the lateral parts 4 and the shell housing 3.

[0029] FIG. 2 schematically shows the shell housing 3 and a rotor 2 received therein. The rotor 2 visible in FIG. 2 drives an eccentric shaft, not illustrated, so as to rotate about a schematically indicated central axis A.

[0030] As can be seen in FIG. 2, the shell housing 3 comprises a shell housing main body 30 with a trochoidal raceway, and a bushing 31 of hard metal. The bushing 31 is pressed into the shell housing main body 30 in such a way that an external circumferential contour of the bushing 31 bears in a sealing manner on the trochoidal raceway and the trochoidal raceway is cladded by means of the bushing.

[0031] In an embodiment, the bushing 31 conjointly with the slide plates 5 according to FIG. 1 forms a sealed joint.

[0032] Sealing strips 21, which bear in a sealing manner on the surface of the bushing 31 and are moved along the surface of the bushing 31 while the rotor 2 is in motion, are provided at each piston corner 20 of the rotor 2. Furthermore, curved strips 22 are provided on the surfaces of the rotor 2. The slide plates 5 illustrated in FIG. 1 serve as raceways for the curved strips 22, wherein the curved strips 22 bear in a sealing manner on the slide plates 5.

[0033] In this way, three sealed operating chambers of alternating size are formed by means of the bushing 31, the slide plates 5, the sealing strips 21, and the curved strips 22, wherein a four-stroke process is taking place in said operating chambers during a rotation of the rotor.

[0034] In the exemplary embodiment illustrated, an intake and an exhaust are in each case provided on the trochoidal raceway of the shell housing 3, wherein the bushing 31 has corresponding clearances 32. In other embodiments, a lateral intake and/or a lateral exhaust is/are provided in a lateral part, whereby one of the slide plates 5 is provided with corresponding clearances.

[0035] The shell housing 3 with the press-fitted bushing 31 is characterized by a high wear-resistance and permits a smooth surface for reliable sealing of the operating chambers. Particularly cost-effective manufacturing in serial production is possible by using a bushing which in an initial shape has an oval circumferential contour, and which is elastically deformed when press-fitting into the shell housing main body 30.

[0036] The use of the bushing 31 is also advantageous in embodiments of a housing 1 which has no slide plates 5, and/or in which slide plates are provided that are received in clearances on the lateral parts and/or on the shell housing main body.

[0037] In the event of a worn bushing 31, the bushing 31 can be disassembled and replaced without destroying the shell housing main body 30.

[0038] The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.