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Radial Swivel Motor and Process for Manufacturing Same

a swivel motor and radial technology, applied in the direction of positive displacement liquid engines, liquid fuel engines, piston pumps, etc., can solve the problems of unsatisfactory finish of the inner circumferential surface sliding and sealing function failure of the swivel motor equipped with such a stator, and limited service life of the swivel motor, so as to reduce the effort needed and improve the surface finish

Inactive Publication Date: 2008-05-29
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The basic object of the present invention is therefore to improve the surface finish of the inner circumferential surfaces of the stator of a swivel motor of this class and to reduce the effort needed for manufacture at the same time.

Problems solved by technology

This finish is unsatisfactory for the sliding and sealing function of the inner circumferential surfaces of the stator because a surface finish of Rz=1.0 to 2.0 is usually required herefor.
Therefore, a swivel motor equipped with such a stator fails to reach its performance parameters because the inner sealing between the pressurized working chamber and the pressureless working chamber cannot be guaranteed due to the roughness of the sealing surfaces.
Because of the rough surface of the stator, the frame sealing elements are also subject to greater wear, so that the swivel motor also has a limited service life only.
Furthermore, the manufacture of such a stator especially by the broaching process is very complicated in terms of manufacturing technology and expensive.
All these attempts failed ultimately because of the high costs or the limited installation conditions.

Method used

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  • Radial Swivel Motor and Process for Manufacturing Same
  • Radial Swivel Motor and Process for Manufacturing Same
  • Radial Swivel Motor and Process for Manufacturing Same

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0042]Thus, the stator housing 5 is designed in a first embodiment according to FIG. 3 as a tube and has two longitudinally extending mounting slots 17 of a limited length, which are located opposite each other, for the two stator blades 13. Each stator blade 13 according to FIG. 4 is correspondingly provided with a longitudinally extending mounting tongue 18. Each mounting slot 17 has a circular conical surface, which becomes larger in the radial direction from the internal diameter towards the external diameter of the stator housing 5. By contrast, each mounting tongue 18 of the stator blade 13 has a circular conical surface, which tapers in the radial direction from the inside to the outside. The internal dimensions of the mounting slot 17 and the external dimensions of the mounting tongue 18 are coordinated with one another such that the smaller dimensions of the mounting slot 17 and the larger dimensions of the mounting tongue 18 can fit each other. The cone angle is selected t...

second embodiment

[0043]In a second embodiment according to FIGS. 5 through 8, the tubular stator housing 5 has two wedge-shaped grooves 20, which are located opposite each other and extend over the length of the stator housing 5. The wedge-shaped grooves 20 have, moreover, a dovetailed cross section. Fitting this, the stator blade 13 according to FIG. 8 is provided with external dimensions that make it possible to push the stator blade 13 axially into the corresponding wedge-shaped groove 20 and prevent falling out of the wedge-shaped groove 20 radially. The wedge angles of the wedge-shaped grooves 20 and of the outer shape of the stator blade 13 are equal and are selected to be such that a clamping and self-locking frictional engagement becomes established. As is shown in FIG. 7, clamping and self-locking frictional engagement can be achieved between the stator housing 5 and each stator blade 13, analogously hereto, by two parallel wedge-shaped grooves 20′ directed in the same direction in the stat...

third embodiment

[0044]In a third embodiment according to FIGS. 9 and 10, the two stator blades 13 are screwed to the tubular stator housing 5 and additionally secured in their position. The securing in position is achieved by means of a fitting groove 21 in the stator housing 5 and by a fitting tongue 22 at the stator blade 13. Instead of the tongue-and-groove securing, pin-and-hole securing may also be performed.

[0045]To ensure sealing between the working chambers on both sides of the stator blade 13, each stator blade 13 is equipped with at least one longitudinal groove for a sealing element 23.

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Abstract

To improve the surface finish of the inner circumferential surfaces of the stator and to reduce the manufacturing effort, it is proposed that the stator with a stator housing 1 and with the stator blades 13 have a two-part design and to insert the stator blade 13 into the stator housing 5 in such a way that they rotate in unison. In terms of the process, it is proposed that a commercially available tube with an inner circumferential surface suitable for use as a sealing surface be used and that longitudinally extending joining means be prepared. The stator blades 13 manufactured as an individual part receive corresponding joining means, so that the stator housing 5 and the stator blades 13 are welded, clamped or screwed together.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a U.S. National Phase application of International Application PCT / DE 2005 / 000681 and claims the benefit of priority under 35 U.S.C. § 119 of German Patent Application DE 10 2004 020 190.0 filed Apr. 22, 2004, the entire contents of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention pertains to a swivel motor according to the preamble of claim 1 and to a corresponding manufacturing process according to the preamble of claim 7BACKGROUND OF THE INVENTION[0003]Such swivel motors are used especially in the aircraft and automobile industries to perform a great variety of tasks. A preferred field of application is in the vehicle industry, where the swivel motor is used for the roll stabilization of a motor vehicle in conjunction with stabilizers.[0004]Such a swivel motor is described, for example, in DE 197 25 412 C2. This swivel motor comprises a stator, which is connected to a firs...

Claims

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Application Information

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IPC IPC(8): F04B17/00F04B39/10F15B15/12
CPCF15B15/12
Inventor BEETZ, STEFANKRUEGER, WINFRIEDBAUSTIAN, TORSTENUECKER, JOACHIM
Owner ZF FRIEDRICHSHAFEN AG