Internal-combustion engines – Engine speed regulator – Idle speed control
Patent
1992-02-12
1993-08-31
Dolinar, Andrew M.
Internal-combustion engines
Engine speed regulator
Idle speed control
25112911, 335272, F02M 300, F16K 3104, H02K 2122
Patent
active
052399613
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a rotary idle-speed actuator.
More particularly, it relates to a rotary idle-speed actuator for controlling a throttle cross-section in a line carrying combustion air for an internal combustion engine, which has a collectorless actuating motor with a stator fixed to a housing and a rotatable rotor mounted on a shaft of a throttle member which more or less opens a control opening. Such a rotary idle-speed actuator, the armature of which is constructed to be tubular and which has permanent magnets on its outside, is already known from DE-A 37 28 589. A stator with field windings and magnetic conductive bodies, which is firmly joined to the housing, is arranged around the rotatable armature. Overall, the structure of this rotary actuator is relatively complex.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a rotary idle-speed actuator which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a rotor idle-speed actuator in which the rotor of the actuating motor has a cup-shaped form with a bottom and a cylinder-jacket-shaped wall and a stator with its field windings is arranged inside the rotor, wherein the rotor is only mounted at one end with its end opposite to the bottom of the cup-shaped rotor at a housing cap.
When the rotary idle-speed actuator is designed in accordance with the present invention it has the advantage that it has a parts-saving and uncomplicated structure and is easily assembled. In addition, the entire electrical part of the actuating motor is better protected by the cup-shaped form of the rotor, for example against contamination from the pneumatic part of the rotary actuator. In addition, the attachment of sensors is facilitated since the housing parts around the large-area wall of the rotor, which is located on the outside, and around the free shaft end at the rotary slide valve offer many possibilities of attachment.
In accordance with another feature of the present invention, the rotor carries permanent magnet segments on the inside of its cylinder-jacket-shaped wall.
Still a further feature of the present invention is that the cup-shaped rotor is centrally joined to a shaft on which the throttle member of the rotary actuator is also mounted. A device or sensor for determining the rotary position of the rotary slide valve is particularly advantageous. This makes it possible to control also the idle-speed air accurately in electronically controlled combustion engines.
The sensor can be arranged opposite to the rotor or its shaft, and in particular opposite to the end of the shaft facing away from the rotor in the housing. The sensor can be also arranged opposite the free edge of the cup-shaped rotor at the housing cap. Finally, it can be arranged opposite to the cylinder-jacket-shaped wall of the rotor at the housing cap.
The sensor can scan optical or magnetic marks on the rotor or the shaft. It can also sense mechanical or electrically effective marks on the rotor of the shaft. It can determine the rotary position of the shaft and include a potentiometer.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The single FIGURE of the drawings is a view showing a second of a rotary idle-speed actuator in accordance with the present invention.
DESCRIPTION OF A PREFERRED EMBODIMENT
The rotary actuator 1 has an actuating motor 2 with a rotor 9 acting on a throttle member 3 which is arranged in a bypass line 4 in a housing 12. The bypass line 4 is connecte
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Becker Herbert
Dick Dieter
Gerhard Albert
Kalippke Harald
Meiwes Johannes
Dolinar Andrew M.
Robert & Bosch GmbH
Striker Michael J.
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