Aisin Seiki Kabushiki Kaisha

Tatsuo Kato

Tadashi Terazawa

Mitsuo Kikkawa

Shoichi Doi

A throttle control apparatus includes an accelerator operation mechanism, a driving source generating driving force in response to at least an operation amount of the accelerator operation mechanism, a throttle shaft fixing a throttle valve of an internal combustion engine thereto and supported on a housing so as to be able to rotate, an electromagnetic clutch mechanism being intermittent a connection between the throttle shaft and the driving source and having a dog clutch which transmits the driving force of the driving source to the throttle shaft and a driving control device for controlling the electromagnetic clutch and the driving source and opening and closing the throttle valve. According to this constitution, when the electromagnetic clutch mechanism operates, the driving source is connected with the throttle shaft via the dog clutch and the driving force of the driving source is immediately transmitted to the throttle shaft. Therefore, it is able to obtain a good response performance and it is able to improve the durability. Furthermore, the electromagnetic clutch mechanism may be provided with an electromagnetic coil, a rotor and a movable member. In this case, when the throttle control apparatus is constituted so as to transmit the driving source via outer teeth which are connected with the driving source and which are formed on outer circumferential edge portion of the rotor and the nail portions which are formed on the rotor and the movable member adjacent to the outer teeth, the throttle control apparatus can be made lighter and smaller.

Throttle control apparatus

A throttle control apparatus includes an accelerator operation mechanism, a driving source, a throttle shaft fixing a throttle valve, a supporting member fixed to the throttle shaft, a rotor supported on the throttle shaft and connected with the driving source so as to be rotated by the driving source, a movable member movably supported on the throttle shaft in the axial direction of the throttle shaft between the rotor and the supporting member, a connection member connecting the movable member with the supporting member, an electromagnetic coil attracting the movable member under the exciting condition for connecting the movable member with the rotor, an engaging member fixed to the movable member and extending toward the axial direction of the throttle shaft, an operation member having an end surface which can be engaged with the engaging member and connected with the accelerator operation mechanism so as to be able to rotate in response to the accelerator. The throttle control apparatus is constituted so as not to engage the engaging member with the operation member under the exciting condition of the electromagnetic coil. Therefore, in the acceleration slip control, the driving source is controlled in response to the slip condition and throttle shaft is rotated by the driving source regardless of the accelerator. The engagement between the rotor and the movable member is released under the abnormal condition and the engaging member is engaged with the operation member. Thereby, the throttle shaft is directly driven in response to the operation of the accelerator.

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Handa, Japan

Tatsuo Kato