Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1994-10-04
1996-11-19
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 89, 310239, H02K 510, H02K 500
Patent
active
055765866
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an electric motor, particularly a commutator motor sealed to be liquid-tight. The motor has a bowl-shaped motor housing to which a drive housing is axially flanged. The drive housing accommodates, for example, a hydraulic pump driven by the electric motor. The motor further has a brush carrier plate which supports brushes shiftable relative to the commutator and which is disposed between the end faces of the motor housing and the device housing. Axially flange-mounted hydraulic pump of the type disclosed in the preamble to claim 1.
An electric motor is already known from EP 0,472,746.A1, in which the rotary shaft projects with an eccentric shaft end, which drives the plungers of a flange-mounted hydraulic pump, from the end face of a pot-shaped motor housing sealed by an end shield. Moreover, a separate carrier plate is provided in the end shield for brushes that cooperate in a known way with the commutator provided on the drive. Because of the numerous individual parts, the assembly expenditure in this known electric motor is considerably high.
SUMMARY OF THE INVENTION
It is the object of the invention to further simplify and reduce the cost of an electric motor for driving a hydraulic pump with regard to production and assembly expenditures. This object is accomplished by the invention, according to which, briefly stated, the electric motor and drive housing assembly includes a motor housing having an open end and a drive housing. The motor housing is affixed to the drive housing such that the opening of the motor housing faces the outer surface of the drive housing. A rotor accommodated in the motor housing has a rotor shaft supported in the motor housing and extending through the opening. A commutator is mounted on the rotor shaft in a region of the opening. A shaft bearing is mounted on the rotor shaft in a region of the opening. A brush carrier plate is attached to the motor housing and closes the opening. The brush carrier plate forms an end plate of the motor housing and a liquid-tight seal between the motor housing and the drive housing. Brushes are mounted on the brush carrier plate for cooperation with and shifting movement with respect to the commutator. Further, a centering arrangement is provided in the brush carrier plate for centering the shaft bearings.
The electric motor flange-mounted to the drive housing (pump housing) of the hydraulic pump no longer has an end shield that seals the motor housing to be liquid-tight. According to the invention, the brush carrier plate assumes the sealing function between the motor housing and the pump housing. In addition, the brush carrier plate serves simultaneously as a centering element for a bearing secured to the motor shaft. Because of this, a test of the electric motor has already been performed in this stage of assembly. Also, the electric motor can be safely transported in this pre-assembled state. The omission of the end shield creates an inexpensive and easy-to-assemble electric motor unit for a hydraulic pump.
The invention is described in detail below by way of an embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an axial partial section of a commutator motor having a flange-mounted pump housing, and is FIG. 2 is a detail from FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 shows an electric motor, particularly a sealed, liquid-tight commutator motor 1, having a pot-shaped (bowl-shaped) motor housing 3 whose cylindrical jacket part 4 is provided on the inner side 7 with permanent magnets 9, 11. A rotary shaft 13 to which a rotor lamina stack 15 is secured is disposed in the motor housing, 3 the stack receiving a rotor winding 19 connected to a commutator 17. The commutator 17 is in contact connection with brushes 25, 27, which are acted upon by springs 21, 23 and are guided in housings 29, 31. These guide housings 29, 31 are fixedly connected to a brush carrier plate 33 and are made of, for example, brass. The motor housing 3 is flange-mounted to an end face 35 of a
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Butler John C.
Licentia Patent-Verwaltungs-GmbH
Stephan Steven L.
LandOfFree
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