Encoder with a housing, which can be assembled

Details Encoder with a housing, which can be assembled Encoder with a housing, which can be assembled

2000-05-25

2002-10-08

Mullins, Burton S. (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S049540, C310S089000, C250S231130

Reexamination Certificate

active

06462442

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an encoder with a housing, which can be assembled, for flanging at the front end to a motor
1
, which has a motor shaft
2
protruding into the housing at at least one flange plane, the housing consisting of a base plate
4
with an inner part
4
a
and an upper part
11
of the housing, which can be fitted into one another for the assembly. On the inner part
4
a
of the housing, bayonet segments
12
a
are disposed, which engage corresponding recesses
12
b
of the upper part of the housing. Furthermore, at the bayonet segment
12
a
, guiding surfaces
5
a
are constructed, which form a sliding guide with corresponding counter surfaces
5
b
at the upper part of the housing and which, when inserted, bring about a separation of the upper part
11
from the base plate
4
by rotation in the peripheral direction. In a roof surface of the upper part of the housing, a contact surface
16
for adjusting a timing disk
10
on the motor shaft
2
is formed concentrically with the latter.
2. Description of the Related Art
An encoder of the type mentioned above is known from the DE 196 41 926 A1 (RUHLATEC Industrieprodukte GmbH). The timing disk holder, described there, is held by a retaining ring
14
in the pre-assembled state in the housing unit and, by these means, prevented from inadvertently falling out of the housing. The retaining ring
14
has adequate clearance for centering the timing disk on the motor shaft while the upper and lower parts of the housing are being assembled.
In the case of shafts of larger diameter (more than 3 mm), the assembly becomes very difficult because of the pressing-on forces, which constantly become larger. The surface quality of the motor shaft and the timing disk hub must be very high, so that jamming cannot occur even when the fit tolerances are very tight. A further problem consists therein that, after the assembly is completed, there must be a so-called “unlocking” of the timing disk. This means that the housing is distanced from the timing disk only by rotating the bayonet surfaces; the timing disk then runs freely on bearings on the motor shaft. Here also, there can be problems with the retaining ring.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to make it possible, in the case of an encoder of the type named above, to secure the timing disk before the assembly and the unlocking after the assembly in such a manner that, on the one hand, a central position in relation to the motor shaft is maintained even under more difficult installation and transporting conditions and, on the other, a reliable unlocking can take place after the upper part of the housing is fitted together with the base plate, which is connected with the motor shaft.
Pursuant to the invention, this objective is accomplished by the distinguishing features given in the claims. It has turned out that a reliable centering and unlocking becomes possible when a fork with prong openings of different width is used.


REFERENCES:
patent: 4942295 (1990-07-01), Brunner et al.
patent: 5057684 (1991-10-01), Service
patent: 5081756 (1992-01-01), Abe et al.
patent: 5184038 (1993-02-01), Matsui et al.
patent: 5708496 (1998-01-01), Barnett et al.
patent: 5859425 (1999-01-01), Mleinek et al.
patent: 5883384 (1999-03-01), Kato et al.
patent: 196 41 929 (1998-04-01), None
patent: 0 557 564 (1993-09-01), None

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