Abstract: The present invention provides a variable valve mechanism of an internal combustion engine which includes a main arm that is capable of swinging and that drives a valve when swinging, a first sub arm that is provided on one side in the lateral direction of the main arm and that swings when driven by a first cam, a second sub arm that is provided on the other side in the lateral direction of the main arm and that swings when driven by a second cam, and a switch device that performs switching between a first coupled state where only the first sub arm of the first and second sub arms is coupled to the main arm, and a second coupled state where only the second sub arm of the first and second sub arms is coupled to the main arm.

Abstract: A lash adjuster includes a plunger and a partitioning member inserted into the plunger. The plunger has a bottom wall with a valve hole and a peripheral wall having an oil passage hole. The plunger defines a high-pressure chamber between the bottom wall and a body. The partitioning member has a baffle having first and second plate surfaces. The baffle has an upper end serving as oil passage end. The plunger has an interior divided into two spaces. The passage hole is located at one space side. An oil passage is defined by an inner peripheral wall surface of the plunger and the first plate surface. A low-pressure chamber is defined at the other space side to store hydraulic fluid. The low-pressure chamber supplies the fluid through the valve hole into the high-pressure chamber and is defined by the inner peripheral wall surface of the plunger and the second plate surface.

Abstract: A lash adjuster includes a plunger having a bottom wall with a valve hole and a peripheral wall having an oil passage hole and an inner periphery formed with a recessed groove, the plunger defining a high-pressure chamber between the bottom wall and a body, and a partitioning member having an oil passage end located above the oil passage hole. The partitioning member has an oil-passage defining portion located opposite the recessed groove and defining an oil passage between itself and a groove face of the recessed groove. The partitioning member defines a low-pressure chamber reserving a hydraulic fluid flowing through the oil passage hole, the oil passage and the oil passage end. The low-pressure chamber causes the reserved hydraulic fluid to flow through the valve hole into the high-pressure chamber. The partitioning member is formed into a cylindrical shape and extends in an up-down direction without any stepped part.

Abstract: A damper structure for a gear device includes a first gear (2) mounted to turn with respect to a shaft (1) in a circumferential direction, a second gear (3) mounted on the shaft (1) to rotate integrally, a stopper rubber (33) mounted on the second gear (3) to face the first gear (2), and a pressing protrusion (24) at the first gear (2) to face the second gear (3). The stopper rubber (33) is configured to be elastically deformed by pressing the pressing protrusion (24) in a circumferential direction of the second gear (3) during rotation of the first gear (2) and be restored to the initial shape by separating the pressing protrusion (24) during stop of the first gear (2). A recess (25) for accumulating lubricating oil in the first gear (2) is formed to face the stopper rubber (33).

Abstract: A lash adjuster includes a body formed into a bottomed cylindrical shape, a plunger movably inserted into the body and having a peripheral wall having an oil passage hole, and a partitioning member inserted into the plunger. The plunger defines a high-pressure chamber between the body and a plunger underside and includes a first threaded portion formed in an inner periphery of the peripheral wall. The partitioning member has an oil passage end located above the oil passage hole and an oil passage is defined between an outer surface of the partitioning member and the plunger peripheral wall. A low-pressure chamber is defined inside the partitioning member to reserve hydraulic fluid flowing through the oil passage hole. The hydraulic fluid is then supplied into the high-pressure chamber. The partitioning member has an outer periphery formed with a second threaded portion threadingly coupled with the first threaded portion.

Abstract: A lash adjuster includes a body, a plunger inserted, into the body and having a bottom wall formed with a valve hole and a peripheral wall standing from the bottom wall and having an oil passage hole, the plunger defining a high-pressure chamber between the bottom wall and the body, a partitioning member inserted into the plunger and having an oil passage end located above the oil passage hole, the partitioning member defining an oil passage between itself and the plunger peripheral wall, the partitioning member having a low-pressure chamber reserving a hydraulic fluid flowing through the oil passage hole, the oil passage and the oil passage end, the low-pressure chamber causing the reserved hydraulic fluid to flow through the valve hole into the high-pressure chamber, and a spacer interposed between the plunger peripheral wall and the partitioning member so that the partitioning member is held in the plunger.

Abstract: The present invention provides a variable valve mechanism of an internal combustion engine, which includes a main arm having at a rear end thereof a supported portion that is continuously supported swingably by a support member without floating upward, a sub arm which has a tip end to which a roller contacting a cam is rotatably attached, in which a center of the roller is located rearward of the pressing portion and forward of a swing center of the supported portion, which has a rear end that is swingably supported with respect to the main arm by a support pin, and in which a center of the support pin is located rearward of the center of the roller and forward of the swing center of the supported portion, and a switch pin that is inserted in a central portion of the roller.

Abstract: The present invention provides a variable valve mechanism of an internal combustion engine which includes a rotary cam, an output arm, an input member, and a switching device that switches between a coupled state and a non-coupled state. The variable valve mechanism changes a drive state of the valve by the switching operation. The input member includes an annular input roller that contacts the rotary cam, and a swing pin that is inserted into the input roller so as to rotatably support the input roller and that swings relative to the output arm when in the non-coupled state. A center of the relative swinging movement is located at a position different from a rotation center of the input roller which is located inward of the input roller.

Abstract: A backlash adjusting method includes pressing an idler gear against a first gear and a second gear with a flexible film being held therebetween so that the idler gear is led to a meshing engagement position where the idler gear is meshing engageable with the first and second gears. The first and second gears are spaced away from each other. The method further includes removing the film after the idler has been led to the meshing engagement position.

Abstract: The present invention provides a variable valve mechanism for an internal combustion engine which includes an input arm, an output arm, a switching pin, and a displacing device. The displacing device includes a pressing device that presses the switching pin from any one of the coupling position and the non-coupling position to the other one of them, a return spring, and a stopper mechanism. The return spring is provided outside of the input arm and the output arm so as to act on one end of the switching pin, which is exposed from the input arm and the output arm. The stopper mechanism includes a displacement restricting groove that is provided on an outer periphery of the switching pin, and a lock member that is engaged with the displacement restricting groove and contacts one end of the displacement restricting groove when the switching pin is stopped at the non-coupling position.

Abstract: A turbocharger 1 includes a compressor housing 2 and a bearing housing 3. The compressor housing 2 has a shroud surface 221 and a diffuser surface 222. The bearing housing 3 has an opposite surface 311 facing the diffuser surface 222. An adhesion preventing part 4 is provided on at least one of the diffuser surface 222 and the opposite surface 311. The turbocharger 1 is configured so that compressed air spouts out from the adhesion preventing part 4 to the diffuser passage 15 by an ejector effect caused when compressed air passes through the diffuser passage 15.

Abstract: The present invention provides a turbocharger that prevents a seizure of a shaft member, prevents a leakage of exhaust gas, suppresses deterioration of components, and reduces a number of components. The turbocharger includes a waste gate valve which is connected to the shaft member rotatably supported by penetrating a support hole of the turbine housing. The waste gate valve includes an inclined surface formed at a portion facing an opening of a bypass passage. When the waste gate valve is opened, exhaust gas flown into the bypass passage presses the inclined surface, thrust force is applied to the shaft member in a shaft direction, and a seal contact portion is pressed against a peripheral edge of the support hole via a seal member.

Abstract: A lubrication structure for a rocker arm includes a lash adjuster mounted in an accommodating portion located in an end of the rocker arm and a pushrod abutting against a lower end of the lash adjuster. The rocker arm is formed with an arm-inside oil supply passage for supplying lubrication oil to the lash adjuster. The lubrication oil guided into the accommodating portion is further guided through a through guide hole of the accommodating portion to an outer peripheral surface of the accommodating portion. The lubrication oil is further guided from an outer oil supply passage formed downwardly in the outer surface of the accommodating portion to the abutment between the lash adjuster and the pushrod.

Abstract: A variable valve mechanism that is downsized by providing a crank mechanism in place of an egg-shaped cam on an input shaft that is rotationally driven by a crankshaft of an internal combustion engine. A variable valve mechanism (30) having a variable mechanism (30) that changes the opening/closing amount of a valve (13), includes an input shaft (12) that is rotationally driven by an internal combustion engine. The input shaft (12) is provided with a crank mechanism (14) that is connected to the variable mechanism (30) and converts the rotational motion of the input shaft (12) into reciprocating motion for opening and closing the valve (13).

Abstract: A lash adjuster includes a body, a plunger inserted into the body and having a bottom wall with a valve hole and a peripheral wall having an oil passage hole, and a partitioning member. The plunger defines a high-pressure chamber. The partitioning member is inserted into the plunger and has an oil passage end located above the oil passage hole in an inserted state. The partitioning member has a recess defining an oil passage together with the peripheral wall. The partitioning member defines a low-pressure chamber reserving hydraulic fluid and has, together with the recess, a press-fit portion abutting against an inner periphery of the peripheral wall when the partitioning member is inserted into the plunger. Consequently, the press-fit portion has a deformed cross-sectional shape except for a circular shape when cut at a same height as the oil passage hole.

Abstract: A lash adjuster includes a body, a plunger inserted into the body and a partitioning member inserted into the plunger. The plunger has a bottom wall with a valve hole and a peripheral wall having an oil passage hole. The plunger defines a high-pressure chamber between the bottom wall and the body. The partitioning member has a plate-like baffle located opposite the passage hole. The baffle has an upper end serving as an oil passage end located above the passage hole. The plunger has interior divided into two spaces by the baffle. The passage hole is located at one space side. An oil passage is defined at one space side. A low-pressure chamber is defined at the other space side to store hydraulic fluid flowing through the passage hole, the oil passage and the passage end. The low-pressure chamber supplies the fluid through the valve hole into the high-pressure chamber.

Abstract: A lash adjuster includes a body formed into a bottomed cylindrical shape, a plunger movably inserted into the body and having a peripheral wall having an oil passage hole, and a partitioning member inserted into the plunger. The plunger defines a high-pressure chamber between the body and a plunger underside and includes a first threaded portion formed in an inner periphery of the peripheral wall. The partitioning member has an oil passage end located above the oil passage hole and an oil passage is defined between an outer surface of the partitioning member and the plunger peripheral wall. A low-pressure chamber is defined inside the partitioning member to reserve hydraulic fluid flowing through the oil passage hole. The hydraulic fluid is then supplied into the high-pressure chamber. The partitioning member has an outer periphery formed with a second threaded portion threadingly coupled with the first threaded portion.

Abstract: A lash adjuster includes a body, a plunger inserted, into the body and having a bottom wall formed with a valve h ole and a peripheral wall standing from the bottom wall and having an oil passage hole, the plunger defining a high-pressure chamber between the bottom wall and the body, a partitioning member inserted into the plunger and having an oil passage end located above the oil passage hole, the partitioning member defining an oil passage between itself and the plunger peripheral wall, the partitioning member having a low-pressure chamber reserving a hydraulic fluid flowing through the oil passage hole, the oil passage and the oil passage end, the low-pressure chamber causing the reserved hydraulic fluid to flow through the valve hole into the high-pressure chamber, and a spacer interposed between the plunger peripheral wall and the partitioning member so that the partitioning member is held in the plunger.

Abstract: A lash adjuster includes a body, a plunger which is inserted into the body and has a bottom wall with a valve hole and a peripheral wall having an oil passage hole and an inner periphery formed with a recessed groove, the plunger defining a high-pressure chamber between the bottom wall and the body, and a partitioning member inserted into the plunger. The partitioning member has an oil passage end located above the oil passage hole. The partitioning member has an oil-passage defining portion located opposite the recessed groove and defining an oil passage between itself and a groove face of the recessed groove. The partitioning member defines a low-pressure chamber inside. The low-pressure chamber reserves a hydraulic fluid flowing through the oil passage hole, the oil passage and the oil passage end. The low-pressure chamber causes the reserved hydraulic fluid to flow through the valve hole into the high-pressure chamber.

Abstract: An inner hole to which a driving shaft is inserted is formed in a cam piece of a camshaft, and a plurality of grooves extending in the insertion direction of the driving shaft are formed in the inner hole. The driving shaft is inserted into the inner hole with the cam piece heated to expand the diameter of the inner hole. By reducing again the diameter of the inner hole by cooling it in this state, an outer circumferential surface of the driving shaft is pressed and raised by the inner hole and enters the groove, by which the cam piece is firmly fixed onto the driving shaft.