Actuator

Internal-combustion engines – Engine speed regulator – Open loop condition responsive

Reexamination Certificate

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Details

C123S400000

Reexamination Certificate

active

06318338

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an actuator used, for example, for a cruise control device for automatically controlling running speed of the motor vehicle in the predetermined and desired value.
2. Description of the Prior Art
As an actuator for the cruise control device, a device has been known, which is provided with an output pulley connected to the throttle valve of the engine through a throttle cable, an electric motor, and an electromagnetic clutch for connecting the output pulley and the electric motor by excitation, and so structured as to pull the throttle cable and control the throttle valve in the opening or closing direction by actuating the electromagnetic clutch and rotating the electric motor together with the output pulley.
However, in the aforementioned conventional actuator, the electromagnetic clutch is provided with a clutch yoke and a bobbin formed with a coil, and the bobbin is housed in the clutch yoke by securing the bobbin to the clutch yoke through caulking. Accordingly, there is a problem in that it is troublesome to attach the bobbin into the motor yoke and difficult to save manpower required for assembling the actuator.
Furthermore, in the aforementioned actuator, although a non-magnetic clutch washer is disposed between the clutch yoke of the electromagnetic clutch and a rotor combined with a wheel gear transmitted with rotational force of the electric motor in order to prevent sliding resistance to increase by magnetic attractive force, the clutch washer does not positioned on a side of neither the clutch yoke nor the rotor. Consequently, there is another problem in that it is difficult to accurately incorporate the clutch washer and there is the possibility that the clutch washer is dislocated.
SUMMARY OF THE INVENTION
This invention is made in view of the aforementioned problem of the prior art, and it is an object to provide an actuator which is possible to improve productivity by reducing the manpower required for assembling the actuator of this kind.
In order to accomplish the aforementioned object, the actuator according to this invention is provided with an electric motor, reduction gears, an electromagnetic clutch and an output pulley, the electromagnetic clutch is provided with a clutch yoke and a bobbin to be housed in the clutch yoke, which are provided with coupling means composed of, for example, a hook formed on the side of bobbin, a hook-insertion hole and a hook-engaging part formed on the side of clutch yoke, and the bobbin is easily fastened to the clutch yoke with the coupling means by snap action. Accordingly, the assembly operation of the actuator is simplified as compared with the caulking process.
In the actuator according to this invention which is provided with a case, an electric motor, reduction gears, an output shaft, a clutch yoke formed with a first supporting port and a rotor formed with a second supporting port, a coil, a clutch disk, an output pulley, a clutch spring and a clutch washer to be disposed between clutch yoke and rotor, the clutch washer is located accurately between the clutch yoke and the rotor by the first and second supporting parts. Therefore the clutch washer is incorporated easily and accurately into the actuator without dislocation and the productivity of the actuator is improved.


REFERENCES:
patent: 4889093 (1989-12-01), Nishiyama
patent: 4909212 (1990-03-01), Minowa et al.
patent: 4932375 (1990-06-01), Burney
patent: 6080075 (2000-06-01), Wussow et al.

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