Planetary gear transmission systems or components – Electric or magnetic drive or control – Differential drive or control
Patent
1989-09-20
1991-07-09
Herrmann, Allan D.
Planetary gear transmission systems or components
Electric or magnetic drive or control
Differential drive or control
192 84A, F16H 144
Patent
active
050301810
DESCRIPTION:
BRIEF SUMMARY
The invention concerns an arrangement according to the preamble of claim 1 and departs from U.S. Pat. No. 3,414,100. Said publication disclosed the combination of separate parts of an electromagnet coupling gear to form a bushing with retaining flange in a manner such that their final assembly is simplified by inserting in a transmission housing the bushing together with coupling elements preassembled therein. But this known coupling system still has disadvantages which hinder or make impossible their use, specifically for locks on axle transmissions. Thus, in the principle already known the armature must be already assembled in the housing before there can be inserted the bushing in which only the magnet and a bearing have been preassembled. The armature and another intermediate element with axial gearing on the shaft must have been already assembled on the installation side before attachment of a coupling wheel. Therefore, the engaging gear does not project from the housing on the input side and the armature is comprised by the magnet only on face end and not also peripherally and thus a sufficient magnetic power can be transmitted only over an axial air gap to be kept relatively small. Due to the consequently limited stroke, only low teeth and thus only low torques are possible. The adjustment of the air play of the armature is here combined with the adjustment of the bearing. Besides, said coupling is disengaged under current and for this reason is already inadequate for locks which must be opened currentless.
Electromagnet gear couplings such as disclosed, for instance, in WO 86/022981 wherein ring magnet, sliding sleeve and armature are to be each separately fitted in a transmission housing, result in expensive assembly and installation conditions that take space and enlarge the magnetic stray flow. Higher electric performances then need in turn larger structural elements and additional construction and material costs. Specially to enlarge and particularly to design a transmission housing for mounting an electromagnetic gear coupling of such kind is often impossible, as for example, in standardize tubular housings such as exist in axle transmissions.
The problem to be solved by the invention is essentially to provide in an insert bushing which can be preassembled as completely as possible, an electromagnet gear coupling, also adequate for optional use as lock actuation in one piece axle transmissions, which operates quickly and noiselessly, wherein the engaging gear can be designed with sufficiently high teeth and the coupling wheel is on the input side before the housing and the armature on the output side in the housing in which the electromagnet gear coupling can be inserted without impairing the air play of the armature and without there being required in the transmission changes worth mentioning in housing or installation.
The solution is obtained with the characteristic features of claim 1 mainly insofar as the ring magnet surrounds a sliding sleeve axially movable on the shaft and which for its part has the armature in the common assembly on the output side but a radial engaging gear projects from the housing on the input side. The assembly designed as bushing, completely ready for installation, is separately insertable in the housing and can be fastened by means of a flange without it being possible for the air play of the armature to change in the process. A radial support of the bushing with axial spacing from the magnet allows a concentrating arrangement favorable to the magnetic flow, and if adequate material is selected for the parts surrounding the magnet, it is possible with only a single and relatively small ring magnet to obtain within the bushing sufficient shifting and retaining forces.
If the sliding sleeve is slid directly on top of an outer spline of the shaft and there is added the opposing gear situated on the frontal surface located on the engagement side of a further hub collar that acts as the external plate support of a frictional engagement device, the sliding sleeve can
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patent: 3414100 (1968-12-01), Spencer
patent: 4546865 (1985-10-01), Hodgman
patent: 4662499 (1987-05-01), Jordan
patent: 4733577 (1988-03-01), Grieser et al.
patent: 4776234 (1988-10-01), Shea
patent: 4781078 (1988-11-01), Blessing et al.
Herrmann Allan D.
Massey Ryan W.
Zahnradfabrik Friedrichshafen AG
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