Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-04-02
1994-03-29
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 42, 310 45, 310 88, 310 91, 310271, 29447, 29596, 53442, 290 38R, 290 48, H02K 500
Patent
active
052988244
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Electrical machines, in particular starter devices of internal-combustion engines, which are subjected to dirt and moisture during rugged use in motor vehicles, are sealed and protected against corrosion in a known manner, by dip varnishing. In this case, it is disadvantageous that the varnishing generally takes place in a dipping process using varnishes which inherently and during processing require costly environmental protection measures because of the risk of explosion and to prevent hazardous emissions. It is furthermore disadvantageous that the motor housing, drive bearing and commutator bearing have a certain elasticity in the case of clamping bolts or tie rods which hold starter devices together. For example, it is necessary to counteract the vibration influences during operation of the motor vehicle. However, the varnishes become brittle after a certain period of time and are then always breaking out of the separating joints on the end sides of the motor housing. The inside of the motor is no longer sealed, dirt and moisture can penetrate, and lead to damage in the motor. In addition, corrosion damage occurs at the joint sections where there is no varnish.
The same also applies in general to electrical machines having the same or similar construction, with corresponding seals which are used, for example, in motor vehicles as generators, as small motors for other units such as windscreen wipers or, for example, also as drive motors in electric tools.
An electric motor for a starter device is already known, with a rubber tube pushed a motor housing a rubber tube, and covering in a waterproof manner only the separating joints at the end sides of the motor housing on which the drive and commutator bearings are arranged. In this case, it is disadvantageous that the rubber tube is a complicated and expensive moulded part. Furthermore, the rubber tube is provided on one end with a radially inwardly projecting holder and a hole through which a braided power supply cable is pushed. In addition, the rubber tube has annular inner shoulders distributed over its complete length, in order to serve as impact protection for the motor housing and the permanent magnets which are bonded to its inner wall.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a covering for electrical machines which avoids the disadvantages of the prior art.
More particularly, it is an object of the present invention to provide a covering for electrical machines which has improved the moisture sealing and corrosion resistance and is executed with the aid of simple and environmentally friendly means suitable for economical mass production.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a sealing covering for electrical machines which has at least one film place around the pole housing and around parts attached to the pole housing, and permanently shrunk onto the covered parts.
When the covering is designed in accordance with the present invention, it is advantageous that shrunk-on films permit improved corrosion protection and permanent sealing of the electrical machine. Furthermore, costs and installation complexity for the sealing covering, constructed as a film, are significantly reduced. It is also primarily advantageous in comparison with varnishes that the factors which are harmful to the environment, together with the consequential costs, can be almost completely avoided. Residual materials which are harmful to the environment can be collected and passed to recycling processes.
In a particularly advantageous manner, a low-cost section of a pocket-shaped part of a shrink sleeve can be pushed or drawn onto the electrical machine and then shrunk on. The film which is used as the covering can also be provided with prestampings corresponding to the external shape of the electrical machine. After covering, the film edges are attached to one another before the film
REFERENCES:
patent: 2476937 (1993-04-01), White
patent: 2774894 (1956-12-01), Antonidis
patent: 3670880 (1972-06-01), Burleson
patent: 4248030 (1981-02-01), Heckman
patent: 4309815 (1982-01-01), Schmitt
patent: 4626724 (1986-12-01), Morishita
patent: 4729160 (1988-03-01), Brown
patent: 4866294 (1989-09-01), Johnston
patent: 5101114 (1992-03-01), Isozumi
Patent Abstracts of Japan, vol. 7, No. 128, 3 Jun. 1983 and JP-A-58 47155 18 Mar. 1983.
Robert & Bosch GmbH
Skudy R.
Striker Michael J.
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