Abstract: In a clutch device in which a diaphragm spring presses a pressure plate to have a friction disc pressed against a rotating part, a clutch device with which a half clutch condition is easily retained is provided. The clutch device comprises: a diaphragm spring comprising a plurality of plate springs arranged along a circumference having a rotation axis as a center wherein end portions thereof projecting toward the rotation axis constitute free ends; a pressure plate to cause the friction disc to be pressed against the rotating part by being biased by the diaphragm spring; and a release device to disconnect power from the rotating part to the friction disc by reducing bias force applied by the diaphragm spring to the pressure plate as the diaphragm spring is deformed by displacing free end portion side of the plate spring in one direction along the rotation axis.

Abstract: In a clutch device in which a diaphragm spring presses a pressure plate to have a friction disc pressed against a rotating part, a clutch device with which a half clutch condition is easily retained is provided. The clutch device comprises: a diaphragm spring comprising a plurality of plate springs arranged along a circumference having a rotation axis as a center wherein end portions thereof projecting toward the rotation axis constitute free ends; a pressure plate to cause the friction disc to be pressed against the rotating part by being biased by the diaphragm spring; and a release device to disconnect power from the rotating part to the friction disc by reducing bias force applied by the diaphragm spring to the pressure plate as the diaphragm spring is deformed by displacing free end portion side of the plate spring in one direction along the rotation axis.

Abstract: This invention has an object to provide a fuel pressurizing apparatus which is light, compact, durable and inexpensive whereby a working machine can be operated even on a slope without difficulty. In order to achieve this object, a pressure adjusting chamber is formed in a portion of a passage in a breather device of an engine, and a pipe conduit is provided to communicate the pressure adjusting chamber with a fuel tank. A check valve which does not allow fuel from the fuel tank to pass is provided in a portion of this pipe conduit. A vent hole which is constantly open is provided in the fuel tank, and a cross-sectional area of the vent hole is set to maintain balance of a pressure from the pressure adjusting chamber with a pressure required for the fuel tank. A space is formed in an upper portion of the fuel tank so as to project therefrom.