Honda Motor Co., Ltd.

Keihin Corporation

Takuya Wakabayashi

Hideki Kawauchi

Yukinobu Sakata

Takahiro Sasaki

Toshihiro Yamaki

Masakazu Hamachi

Kuri Kasuya

Takuma Kanazawa

Hiroyuki Murase

Oxidant gas flows to the fuel cell stack through an oxidant gas supply channel. Oxidant off-gas is discharged from the fuel cell stack through an oxidant off-gas exhaust channel. A refrigerant is discharged from the fuel cell stack through a refrigerant exhaust channel. An outlet sealing valve is provided in the oxidant off-gas exhaust channel. The outlet sealing valve includes a main body, a valve seat, a valve body, and a refrigerant passage. The main body has a passage through which the oxidant off-gas flows. The valve seat is provided in the passage. The valve body is provided in the passage to be seated on the valve seat to close the passage. The refrigerant passage is branched off from the refrigerant exhaust channel. The refrigerant flows in a vicinity of at least one of the valve seat and the valve body through the refrigerant passage.

Fuel cell system

A locking mechanism for a valve device, which includes a valve body for opening and closing a fluid path, for retaining the valve body at a predetermined opening position, the valve device further including a gear wheel to which rotational driving force of a rotational driving source is transmitted and a rack section having rack teeth provided thereon for meshing engagement with the gear wheel and configured to convert rotational movement of the gear wheel into linear movement and move together with the valve body. The locking mechanism for a valve device includes: a ball abuttable with a wall face of the rack section; and a spring member configured to press the ball toward the wall face; the valve body being retained by frictional force generated when the ball is pressed against the wall face of the rack section.

Locking mechanism for valve device

The on-off valve includes a body having a fluid path, a spherical valve body opening and closing the fluid path, a guide member opposing the valve body and having a flange portion radially extending outward, a first seat member slidable along an outer peripheral surface of the guide member and seating the valve body, an O-ring disposed between the first seat member and the guide member, a chamber formed of an inner wall portion of the fluid path, the outer peripheral surface, the flange portion, and the first seat member, and a spring member disposed in the chamber and urging the first seat member toward the valve body. In the on-off valve, a gap portion is formed between the inner wall portion and the first seat member and connects the valve body side of the fluid path to the chamber.

Valve device

Disclosed herein is a locking mechanism for a valve device having a valve body for retaining the valve body at a predetermined opened position, including: a disk having a rotational shaft rotatable together with a valve body driving shaft and having a cutout groove formed on an outer circumferential face thereof; a ball disposed in the cutout groove; a body member having an axial direction restriction face and an inner circumferential face; a holder member having an engaging face which has a diameter gradually decreasing toward the ball and is engageable with the ball; and a spring member biasing the holder member toward the ball, wherein said ball is clamped by and among the engaging face which is acted upon by the biasing force of said spring member, the axial direction restriction face and the inner circumferential face so that a rotational direction position of the rotational shaft is retained.

The present invention discloses a fuel cell system that blocks the oxidant gas flow passage. This fuel cell system includes a fuel cell stack, the oxidant gas supply passage, the oxidant gas exhaust passage, the first valve and second valve of normally open type, the first motor that operates open and close operations of the first valve, the second motor that operates open and close operations of the second valve, and the ECU that controls the first motor and the second motor. This ECU controls the first valve and the second valve to be in the open state during the power generation in the fuel cell stack, thereby to open the cathode flow passage, and controls the first valve and the second valve to be in the close state after the power generation in the fuel cell stack is stopped, thereby to block the cathode flow passage. The fuel cell system of the present invention further includes the first solenoid device and the second solenoid device that lock the respective valve bodies of the first valve and the second valve so as to maintain the close state of the first valve and the second valve.

Growing community of inventors

Wako, Japan

Takuya Wakabayashi