Electrical generator or motor structure – Dynamoelectric – Reciprocating
Patent
1992-02-12
1993-07-20
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Reciprocating
310 43, 310 90, H02K 3300, H02K 1502
Patent
active
052296717
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a rotary actuator, particularly for controlling a throttle cross-section in a line carrying operating fluid for an internal combustion engine.
An electromagnetic rotary actuator is known comprising an actuating motor with a stator which is fixed with respect to a housing cap in which the motor is located and with a rotatable rotor which is mounted on a rotor shaft nonrotatably attached to a throttle member which more or less opens a control opening.
Such rotary actuator is already known from German Offenlegungsschrift 37 28 589 but the rotary slide valve of this actuator is supported to be rotatable about a shaft carried in two housing parts. The sealing between the pneumatic part and the electrical part is there effected by the throttle member covering the control opening in the pneumatic housing, which, however, may not "come into grazing contact" in spite of the tolerances required. If dirt particles, shavings or water droplets carried by inadequately cleaned combustion air pass through the sealing gap into the electrical part of the rotary actuator, functional disturbances or corrosion can occur. In addition, air can be sucked away from the electrical part in an unwanted manner and erroneously change the desired fuel/air ratio.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an electromagnetic rotary actuator, particularly for throttling an operating fluid flow in an internal combustion engine, which does not have the above-mentioned disadvantages.
This object and others which will be made more apparent hereinafter are attained in an electromagnetic rotary actuator comprising an actuating motor with a stator which is fixed with respect to the housing and a rotatable rotor which is attached to a rotor shaft of a throttle member which more or less opens a control opening when rotated by the actuating motor.
According to the invention, the electromagnetic rotary actuator comprises an electrical part including a housing cap and an actuating motor comprising a stator held fixed relative to the housing cap and a rotatable rotor positioned so as to be rotatable relative to the stator, the stator and the rotor being held in the housing cap;
a pneumatic part including a one-piece housing containing a portion of a line for a fluid provided with a control opening and a throttle member rotatable so as to more or less open or close the control opening in the line, wherein the one-piece housing also has two bearings, the bearings being located on opposite sides of the throttle member and rotatably supporting a rotor shaft nonrotatably attached to the throttle member and the rotatable rotor so that, when the actuating motor is energized to rotate the rotor, the throttle member is rotated to more or less open or close the throttle opening.
By comparison, the actuating motor according to the invention has the advantage that the sealing of the electrical and of the pneumatic part is improved and the quantity of leakage air is reduced. This is achieved by the improved way of supporting the shaft of the rotary slide valve, on the one hand due to its tolerance-reducing support in a single housing part which leads to a noticeable reduction in the working air gap between throttle member and control opening. On the other hand, the roller bearing between the pneumatic and the electrical part acts as a seal for protecting the motor.
The isolation between the electrical and the pneumatic part of the rotary actuator by the throttle can be particularly advantageous. The gap remaining in the roller bearing is largely closed by cover discs and grease so that duct and fluid droplets are effectively kept back. Arranging the throttle member at an intake end of the line leads to dirt particles predominantly becoming deposited on the rear of the throttle member facing away from the sealing area. Production and assembly of the rotary actuator is simplified by the simple construction of the rotor shaft and the way the sealing roller bearing is mounted. An
REFERENCES:
patent: 3229170 (1966-01-01), Daugherty et al.
patent: 4474149 (1984-10-01), Idogaki et al.
patent: 4496134 (1985-01-01), Idogaki et al.
patent: 4922604 (1990-05-01), Marshall et al.
patent: 5087847 (1992-02-01), Giesbert et al.
Becker Herbert
Dick Dieter
Gerhard Albert
Kalippke Harald
Meiwes Johannes
Jones Judson H.
Robert & Bosch GmbH
Stephan Steven L.
Striker Michael J.
LandOfFree
Electromagnetic rotary actuator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electromagnetic rotary actuator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electromagnetic rotary actuator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1763167