Electronic throttle valve

Patent metadata

Field	Value
Publication number	US-2016237918-A1
Application number	US-201614994222-A
Country	US
Kind code	A1
Filing date	Jan 13, 2016
Priority date	Feb 17, 2015
Publication date	Aug 18, 2016
Grant date	—

Abstract

A housing defines a bore in a tubular shape to draw intake air to an engine. A shaft is supported rotationally relative to the housing. A valve is located in the bore and affixed to the shaft. An electric actuator is configured to rotate one end of the shaft. A load generating unit is configured to apply a biasing load onto the shaft from the one end of the shaft toward the bore in a high-temperature state in which a temperature is higher than a predetermined temperature.

First claim

What is claimed is:

1 . An electronic throttle device comprising:
a housing defining a bore in a tubular shape to draw intake air to an engine; a shaft supported rotationally relative to the housing; a valve located in the bore and affixed to the shaft; an electric actuator configured to rotate one end of the shaft; and a load generating unit configured to apply a biasing load onto the shaft from the one end of the shaft toward the bore in a high-temperature state in which a temperature is higher than a predetermined temperature.

2 . The electronic throttle device according to claim 1 , wherein
the electric actuator includes an electric motor and a reduction gear, the electric motor is configured to convert an electric power into a rotational force, the reduction gear is configured to amplify a rotational torque, which is generated by the electric motor, and to apply the amplified rotational torque to the shaft, the reduction gear includes a valve gear fixed to the one end of the shaft, the electronic throttle device further comprising: a full close stopper configured to regulate a full-close position of the valve, wherein the full close stopper includes a movable-side stopper and a stationary-side stopper, the movable-side stopper is equipped to the valve gear, the stationary-side stopper is equipped to the housing, the full close stopper is configured to regulate the full-close position of the valve when the valve rotates in a closing direction and when the movable-side stopper makes contact with the stationary-side stopper, and the load generating unit is equipped to the full close stopper.

3 . The electronic throttle device according to claim 2 , wherein
the load generating unit includes a pin projected from the stationary-side stopper in a rotational direction of the valve gear, the load generating unit has an inclined surface, which is formed on the movable-side stopper and configured to make contact with the pin when the one end of the shaft moves toward the valve gear due to thermal expansion, and the inclined surface is configured to be biased onto the pin to apply the biasing load onto the one end of the shaft toward the bore when being in a rotational range around the full-close position and when being in the high-temperature state.

4 . The electronic throttle device according to claim 3 , wherein
the inclined surface is configured not to apply the biasing load toward the bore when being at the full-close position and when being in a normal temperature state, in which the temperature is lower than the predetermined temperature, even in a state in which the inclined surface makes contact with the pin.

Assignees

• Denso Corp

Inventors

• Uchida Takuma
• Higuchi Akira
• Kawano Yasushi

Classifications

• F16K31/043 Primary

  characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means · CPC title

• F02D2009/0213

  Electronic or electric governor · CPC title

• F16K1/22

  with axis of rotation crossing the valve member, e.g. butterfly valves · CPC title

• F02D2009/0261

  having a specially shaped transmission member, e.g. a cam, specially toothed gears, with a clutch · CPC title

• F02D9/02 Primary

  concerning induction conduits (throttle valves, or arrangements thereof in conduits F02D9/08) · CPC title