Abstract: A method for manufacturing a friction plate provided with a core plate includes subjecting a spline portion formed at an outer periphery or an inner periphery of the core plate to a hardening process by laser.

Abstract: A friction plate is formed by annularly fixing a plurality of friction material segments to a substantially annular core plate, and a minute groove is formed on a surface of the friction material segment.

Abstract: Since one end of a spring is received by a planar portion of a spring seat provided on any one of an outer plate and an inner plate, it is possible to support the spring with a planar member without machining a bottom wall face of the outer plate into a planar shape. Since the spring seat has seat guide portions that contact the outer plate, it is possible to suppress the fluctuation of the spring seat and the fluctuation of the spring by the seat guide portions, so it is possible to reliably prevent interference of the spring with its peripheral portion. Therefore, a load on the spring is reduced, so it is possible to improve the durability of a one-way clutch.

Abstract: A ratchet type one-way clutch is provided that includes an outer race having a pocket on an inner circumference thereof, an inner race arranged on an inner diameter side of the outer race so as to be coaxial therewith, the inner race having a notch on an outer circumference thereof, a pawl member housed in the pocket and engaged with the notch of the inner race to transmit torque between the inner race and the outer race, and a spring for urging the pawl member to the inner race. The ratchet type one-way clutch is provided with urging force stabilizing means for stabilizing an urging force of the spring.

Abstract: According to the present invention, there is provided a resol phenolic resin for a friction material wherein the resol phenolic resin has a structural unit A represented by Formula (1) and a structural unit B represented by Formula (2): wherein in Formula (1), m represents an integer of 1 or more; in a case where m is 1, R represents a methylol group; and in a case where m is 2 or more, R's independently represent a hydrogen atom or a methylol group and at least one R is a methylol group; and wherein in Formula (2), n represents an integer of 1 or more; in a case where n is 1, R represents a methylol group; and in a case where n is 2 or more, R's independently represent a hydrogen atom or a methylol group and at least one R is a methylol group.

Abstract: Provided is a roller type one-way clutch that can prevent rollers from coming off at the time of conveyance and assembling of an outer race without increasing a cost and a weight. The roller type one-way clutch includes: an outer race having pockets that have a cam surface formed on an inner surface thereof; an inner race that is apart on an inner diameter side in a radial direction from the outer race, concentrically arranged to allow its relative rotation, and has an annular outer peripheral raceway surface; a plurality of rollers each of which is arranged in each pocket, engaged with the cam surface, and transmits torque between the outer race and the inner race; and springs each of which is arranged in each pocket and energizes each roller by one end portion thereof in an engaging direction with respect to the cam surface, the other end portion of each spring is fixed to the outer race, and a support portion that supports each roller in a radial direction is provided at the other end portion.

Abstract: A two-way clutch includes an outer race having a cam section in an inner periphery, an inner race that is separated in an inside diameter direction with respect to the outer race, and is disposed concentrically to be relatively rotatable, a torque transmission member that is disposed between the outer race and the inner race, and transmits torque, a cage that is capable of engaging with the torque transmission member and is movable in a circumferential direction, a drag strip that is supported by the cage, and a switching mechanism that can cause the two-way clutch to take at least a state locked in two directions by causing the drag strip to slide onto the inner race.

Abstract: The present invention provides a friction plate that takes more air into a lubricating oil on a friction surface so as to reduce the shear resistance force of the lubricating oil interposed between friction materials, thereby achieving significantly reduced drag torque at the time of idling, as compared with a conventional friction plate, and a wet-type multiple-disc clutch provided with the friction plate.

Abstract: One way clutch has an inner ring, an outer ring and torque transmission members between the inner ring and the outer ring. Each torque transmission member can shift between a torque transmission position and a non torque transmission position. The one way clutch further has biasing members that bias the torque transmission members respectively toward the torque transmission positions, and a retainer that retains the torque transmission members and the biasing members. The retainer includes first and second mount portions that retain the torque transmission members and the biasing members corresponding thereto. Each of the first and second mount portions has a securing portion that secures one end of the biasing member, and the torque transmission member is pressed by the other end of the biasing member.

Abstract: In a roller type one-way clutch comprising: an outer race; an inner race that is apart from the outer race on an inner diameter side in a radial direction and concentrically arranged to allow its relative rotation; a plurality of rollers that are arranged between the outer race and the inner race and transmit a torque between the outer race and the inner race; and a plurality of block bearings that are arranged between the rollers and between the outer race and the inner race, the roller type one-way clutch is characterized in that a curvature in a circumferential direction of a bearing surface of the block bearing facing an outer peripheral surface of the inner race is higher than a curvature in the circumferential direction of the outer peripheral surface of the inner race.

Abstract: The present invention provides a roller type one-way clutch comprising an outer race in which pockets provided at their inner surfaces with cam surfaces are formed, an inner race spaced apart from the outer race in a radial inner diameter side and disposed coaxially with the outer race for a relative rotational movement and having an annular outer peripheral track surface, a roller disposed within the pocket to be engaged with the cam surfaces and adapted to transmit torque between the outer race and the inner race, and an accordion spring disposed within the pocket and adapted to bias the rollers to be engaged with the cam surfaces, and wherein one end of each accordion spring is secured to an axial end face of the outer race.

Abstract: A two-way clutch includes an outer race having a cam section in an inner periphery, an inner race that is separated in an inside diameter direction with respect to the outer race, and is disposed concentrically to be relatively rotatable, a torque transmission member that is disposed between the outer race and the inner race, and transmits torque, a cage that is capable of engaging with the torque transmission member and is movable in a circumferential direction, a drag strip that is supported by the cage, and a switching mechanism that can cause the two-way clutch to take at least a state locked in two directions by causing the drag strip to slide onto the inner race.

Abstract: A liquid pressure generating apparatus including a pump, and two one-way clutches arranged coaxially with the pump drive shaft in a line in the axial direction on the side of a first axial direction. The pump case includes a projecting portion projecting from the corresponding pump case. Inner races of the respective two one-way clutches are integrated with each other and form a common inner race. Outer races of the respective two one-way clutches are formed independently from each other and are driven respectively by pump driving members different from each other, and directions of restricted relative rotation with respect to the common inner race are identical to each other. The common inner race includes a coupling portion to be coupled to the pump driving shaft on the side of the first axial direction with respect to the projecting portion.

Abstract: The present invention provides a starting clutch disposed between a transmission and an engine and having a wet type multi-plate clutch for transmitting a power, in which the wet type multi-plate clutch includes a plurality of friction plates housed for an axial sliding movement, a clutch drum for housing the friction plates, and a piston for urging a radial central region or therearound of the friction plate to engage the friction plates, and oil which has lubricated the wet type multi-plate clutch is temporarily trapped within the clutch drum and then is discharged.

Abstract: A liquid pressure generating apparatus including a pump; and two one-way clutches arranged coaxially with the pump's drive shaft. Inner races of the respective two one-way clutches are integrated with each other to form a common inner race. Outer races of the respective two one-way clutches are formed independently from each other and are driven respectively by pump driving members different from each other. The common inner race includes a coupling portion coupled to the pump drive shaft and extending in the radial direction and a cylindrical body portion extending from the coupling portion in a second axial direction opposite from the first axial direction on the radially outside the pump drive shaft. The body portion includes a depression indented radially outward on an inner peripheral surface thereof. A lubricant supply portion for the depression is provided radially inside the depression.

Abstract: The present invention provides a friction plate having a friction surface formed by sticking an annular friction material to a substantially annular core plate and wherein the friction surface is provided with a first oil groove having an opening portion opened to an inner peripheral edge of the friction plate and an end terminating at a point between the inner peripheral edge and an outer peripheral edge, and a second oil groove having an opening portion opened to the outer peripheral edge of the friction plate and an end terminating at a point between the inner peripheral edge and the outer peripheral edge.

Abstract: One way clutch has an inner ring, an outer ring and torque transmission members between them. Each torque transmission member can shift between a torque transmission position and a non torque transmission position. Biasing members bias the torque transmission members respectively toward the torque transmission positions. A retainer includes first and second mount portions that retain the torque transmission members and the biasing members corresponding thereto. Each of the mount portions has a securing portion that secures one end of the biasing member, and the torque transmission member is pressed by the other end of the biasing member. The biasing force that the biasing members retained by the second mount portions exert on the torque transmission members corresponding thereto is larger than the biasing force that the biasing members retained by the first mount portions exert on the torque transmission members corresponding thereto.

Abstract: The present invention provides a starting clutch disposed between a transmission and an engine and having a wet type multi-plate clutch for transmitting a power, in which the wet type multi-plate clutch includes a plurality of friction plates housed for an axial sliding movement, a clutch drum for housing the friction plates, and a piston for urging a radial central region or therearound of the friction plate to engage the friction plates, and oil which has lubricated the wet type multi-plate clutch is temporarily trapped within the clutch drum and then is discharged.

Abstract: A differentially controllable two-way clutch including an outer wheel with a cam portion on an inner circumference, an inner wheel arranged apart from the outer wheel and toward an inner diameter of the two-way clutch as well as rotatably and concentrically with respect to the outer wheel, a torque transmission member located between the outer wheel and the inner wheel to transmit torque, a cage configured to hold the torque transmission member and to be slidable in a circumferential direction and which is differentially controlled, and a spring supported by the cage and configured to be capable of biasing the torque transmission member so that the torque transmission member engages with a cam surface.

Abstract: A one-way clutch includes an outer race, an inner race which is spaced from the outer race in an inside diameter direction and arranged concentrically so as to be relatively rotatable, a plurality of engaging members which are arranged between the outer race and the inner race to transmit a torque, and a cage which retains the engaging members. The one-way clutch is provided with volute springs which urge the engaging members in the direction in which the engaging members engage with a cam face of the outer race or the inner race.