| CPC F02D 9/1065 (2013.01) [F02D 9/1005 (2013.01); F16K 1/221 (2013.01); F16K 2200/305 (2021.08)] | 6 Claims |
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1. A throttle device, comprising:
a throttle body including an intake passage therein;
a throttle valve configured to open and close the intake passage;
a throttle shaft coupled to the throttle valve, wherein the throttle shaft has a central axis of rotation;
a rotation member coupled to the throttle shaft and configured to be rotated by a driving power source; and
a coil spring positioned between the throttle body and the rotation member, wherein the coil spring biases the throttle valve toward a default position, wherein:
the coil spring includes a first spring part having a first end, a second spring part having a second end, and an intermediate hook connecting the first spring part to the second spring part;
the first end of the first spring part is held by a first spring locking part on the rotation member;
the second end of the second spring part is held by a second spring locking part on the throttle body;
the intermediate hook is configured to engage with a first stopper on the rotation member and a second stopper on the throttle body;
one of the rotation member and the throttle shaft includes an inner circumferential support part protruding into an internal space of the coil spring, where the inner circumferential support part has a radially outer surface relative to the central axis of rotation, wherein the radially outer surface of the inner circumferential support part is configured to engage and support a radially inner circumferential surface of the first spring part and a radially inner circumferential surface of the second spring part, wherein the radially outer surface of the inner circumferential support part includes a first circumferential portion disposed at a first radial distance from the central axis of rotation and a second circumferential portion at a second radical distance from the central axis of rotation, wherein the first radial distance is greater than the second radial distance;
the rotation member includes an outer circumferential support part configured to engage and support a radially outer circumferential surface of the first spring part;
the intermediate hook includes a first part on the first spring part side and a second part on the second spring part side; and
when the intermediate hook is engaged with the first stopper or the second stopper, the first part of the intermediate hook abuts the first stopper or the second stopper.
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