Abstract: According to an aspect, a power transmission device includes: an annular fixed part including an inner peripheral surface; an output shaft including an outer peripheral surface facing the inner peripheral surface and a recessed surface recessed radially inward from the outer peripheral surface; an input shaft including a pressing portion accommodated in the recessed surface; a pair of first rolling elements that are accommodated in the recessed surface and are arranged on opposite sides in a circumferential direction with respect to the pressing portion; and a pair of second rolling elements each of which has a smaller diameter than a diameter of each first rolling element and is arranged between the corresponding first rolling element and the pressing portion.

Abstract: An electrolytic corrosion prevention member for a rolling bearing, the electrolytic corrosion prevention member being mounted on a rolling bearing unit including the rolling bearing in which one bearing ring is a fixed ring and the other bearing ring is a rotating ring in order to prevent electrolytic corrosion of the rolling bearing, the electrolytic corrosion prevention member includes: a spring plate including an annular portion and a plurality of elastic portions that extend continuously from the annular portion in a radial shape and being formed of a thin plate of a conductive material; and a soft conductive member mounted on a surface of the elastic portion that faces the rotating ring. The soft conductive member is capable of abutting against a side surface of the rotating ring.

Abstract: A shaft grounding member for a rolling bearing, in which one bearing ring is a fixed ring and the other bearing ring is a rotating ring, includes: a spring plate including an annular portion and a plurality of elastic portions extending continuously from the annular portion in a radial shape, the spring plate being made of a thin plate of a conductive material; and a soft conductive member mounted on a surface of the elastic portion facing the rotating ring. The soft conductive member is configured to abut against a side surface of the rotating ring. The spring plate includes a plurality of bent portions provided at a portion of the annular portion facing a side surface of the fixed ring so as to be bent in an axial direction, the plurality of bent portions being deformed to apply a pressing force to the fixed ring.

Abstract: A shaft grounding member for a rolling bearing includes: a spring plate including an annular portion and an elastic portion extending continuously from an inner peripheral side end portion of the annular portion to a center of the annular portion, the spring plate being made of a thin plate of a conductive material; and a soft conductive member mounted on a surface of the elastic portion on a side facing the rolling bearing. The soft conductive member is configured to abut against an end surface of a shaft. The spring plate includes a plurality of bent portions provided at a portion of the annular portion facing a side surface of an outer ring so as to be bent in an axial direction, the plurality of bent portions being deformed to apply a pressing force to the outer ring.

Abstract: A power transmission device includes: a fixing member having a cylindrical surface; an output shaft having a facing surface facing the cylindrical surface; an input shaft having a pressing portion disposed between the cylindrical surface and the facing surface; and a pair of rolling elements. The facing surface includes a recessed surface. The recessed surface has a bottom surface and a pair of pressed surfaces. The bottom surface has a central surface and a pair of cam surfaces. A distance between the cam surface and the cylindrical surface increases from the central surface toward the pressed surface. A distance between the cam surface and the cylindrical surface is smaller than a diameter of the rolling element in the portion closer to the central surface, and is greater than the diameter of the rolling element in the portion closer to the pressed surface.

Abstract: A ratchet type clutch device includes outer and inner rings. A shutter plate of the inner ring has restriction tooth portions formed on an outer peripheral surface thereof. When viewed from an axial direction, a state where the restriction tooth portions are misaligned in a first rotation direction for tooth portions and overlap with a part of grooves is set as a closed state of the shutter plate, and a state where all the restriction tooth portions overlap with the tooth portions is set as an open state of the shutter plate. An elastic member biases the shutter plate from the open state to the closed state. Each of first claw members is formed to be able to enter into the corresponding groove in the closed state, and each of second claw members is formed to be able to enter into the corresponding groove in the open state.

Abstract: A ratchet type clutch device includes outer and inner rings. A shutter plate of the inner ring has restriction tooth portions formed on an outer peripheral surface thereof. When viewed from an axial direction, a state where the restriction tooth portions are misaligned in a first rotation direction for tooth portions and overlap with a part of grooves is set as a closed state of the shutter plate, and a state where all the restriction tooth portions overlap with the tooth portions is set as an open state of the shutter plate. An elastic member biases the shutter plate from the open state to the closed state. Each of first claw members is formed to be able to enter into the corresponding groove in the closed state, and each of second claw members is formed to be able to enter into the corresponding groove in the open state.

Abstract: The present invention provides conductive paper with excellent electrical conductivity, strength, and heat resistance, and a method for producing the same, the conductive paper including: a paper substrate containing at least a carbon fiber and a fibrillated fiber, and in which an amount of the fibrillated fiber is from 10 to 120% by mass with respect to the carbon fiber; and a cured product of a thermosetting resin at least partially impregnated into the paper substrate; and the method for producing conductive paper, the method including the steps of: preparing a slurry containing at least a carbon fiber and a fibrillated fiber, and in which an amount of the fibrillated fiber is from 10 to 120% by mass with respect to the carbon fiber; obtaining a paper substrate by subjecting the slurry to a papermaking process; impregnating the paper substrate with a thermosetting resin; and heating the paper substrate impregnated with the thermosetting resin to cure the thermosetting resin.

Abstract: A ratchet type clutch device includes: an outer ring and an inner ring, in which the inner ring includes an outer peripheral surface having tooth portions, the outer ring having claw members that mesh with the tooth portions, each of the claw members includes a shaft portion, a claw portion meshing with one of the tooth portions, and a torque transmission unit projecting from the shaft portion, the shaft portion includes an outer peripheral surface including a first outer peripheral surface, the outer ring includes an outer peripheral holding surface, and a facing surface, the first outer peripheral surface is provided with a top portion, and when the claw portion meshes with the tooth portion, the claw portion is tilted with the top portion abutting on the outer peripheral holding surface, and the leading end surface of the torque transmission unit comes into contact with the facing surface.

Abstract: A power transmission device includes: a fixing member having a cylindrical surface; an output shaft having a facing surface facing the cylindrical surface; an input shaft having a pressing portion disposed between the cylindrical surface and the facing surface; and a pair of rolling elements. The facing surface includes a recessed surface. The recessed surface has a bottom surface and a pair of pressed surfaces. The bottom surface has a central surface and a pair of cam surfaces. A distance between the cam surface and the cylindrical surface increases from the central surface toward the pressed surface. A distance between the cam surface and the cylindrical surface is smaller than a diameter of the rolling element in the portion closer to the central surface, and is greater than the diameter of the rolling element in the portion closer to the pressed surface.

Abstract: An electrolytic corrosion prevention member for a rolling bearing, the electrolytic corrosion prevention member being mounted on a rolling bearing unit including the inner ring rotating type rolling bearing in which an outer ring is fixed to a housing and a shaft directly connected to a motor is fitted to an inner ring in order to prevent electrolytic corrosion of the rolling bearing, the electrolytic corrosion prevention member includes: a spring plate including an annular portion and an elastic portion that extends continuously from an inner peripheral side end portion of the annular portion to a center of the annular portion and being formed of a thin plate of a conductive material; and a soft conductive member mounted on a surface of the elastic portion on a side facing the rolling bearing. The soft conductive member is capable of abutting against an end surface of the shaft.

Abstract: An electrolytic corrosion prevention member for a rolling bearing, the electrolytic corrosion prevention member being mounted on a rolling bearing unit including the rolling bearing in which one bearing ring is a fixed ring and the other bearing ring is a rotating ring in order to prevent electrolytic corrosion of the rolling bearing, the electrolytic corrosion prevention member includes: a spring plate including an annular portion and a plurality of elastic portions that extend continuously from the annular portion in a radial shape and being formed of a thin plate of a conductive material; and a soft conductive member mounted on a surface of the elastic portion that faces the rotating ring. The soft conductive member is capable of abutting against a side surface of the rotating ring.

Abstract: A ratchet type one-way clutch apparatus in which all pawl members are engageable with tooth portions stably, is provided. The one-way clutch 1 comprises an outer race 2, an inner race 3 and a first to nth pawl members 4a to 4c. A plurality of tooth portions 5 are formed on the outer circumferential surface of the inner race 3, and engageable with the first to nth pawl members 4a to 4c. A first to nth pawl member holding portions 12a to 12c are formed on the inner circumferential surface of the outer race 2 for holding the first to nth pawl members 4a to 4c. Biasing members 15a to 15c are held in the first to nth pawl member holding portions 12a to 12c for urging the first to nth pawl members 4a to 4c.

Abstract: A clutch device includes an inner ring; an outer ring; a ratchet engagement mechanism; and a switching mechanism. When an engaging member is provided on an inner peripheral portion of the outer ring, a cam member includes a cam inner ring portion provided to rotate together with the inner ring, a cam outer ring portion disposed outside the cam inner ring portion, and a plurality of rolling elements disposed between the cam inner ring portion and the cam outer ring portion. When the engaging member is provided on an outer peripheral portion of the inner ring, the cam member includes a cam outer ring portion provided to rotate together with the outer ring, a cam inner ring portion disposed inside the cam outer ring portion, and a plurality of rolling elements disposed between the cam inner ring portion and the cam outer ring portion.

Abstract: A ratchet type one-way clutch apparatus in which all pawl members are engageable with tooth portions stably, is provided. The one-way clutch 1 comprises an outer race 2, an inner race 3 and a first to nth pawl members 4a to 4c. A plurality of tooth portions 5 are formed on the outer circumferential surface of the inner race 3, and engageable with the first to nth pawl members 4a to 4c. A first to nth pawl member holding portions 12a to 12c are formed on the inner circumferential surface of the outer race 2 for holding the first to nth pawl members 4a to 4c. Biassing members 15a to 15c are held in the first to nth pawl member holding portions 12a to 12c for urging the first to nth pawl members 4a to 4c.

Abstract: A clutch device includes an inner ring; an outer ring; a ratchet engagement mechanism; and a switching mechanism. When an engaging member is provided on an inner peripheral portion of the outer ring, a cam member includes a cam inner ring portion provided to rotate together with the inner ring, a cam outer ring portion disposed outside the cam inner ring portion, and a plurality of rolling elements disposed between the cam inner ring portion and the cam outer ring portion. When the engaging member is provided on an outer peripheral portion of the inner ring, the cam member includes a cam outer ring portion provided to rotate together with the outer ring, a cam inner ring portion disposed inside the cam outer ring portion, and a plurality of rolling elements disposed between the cam inner ring portion and the cam outer ring portion.

Abstract: A phenol resin for a wet friction material of the invention contains a resol-type phenol resin having, in one molecule, a structural unit A which is derived from a phenol compound having one phenolic hydroxyl group and a structural unit B which is derived from a polyfunctional phenol compound having two phenolic hydroxyl groups.

Abstract: An excessive torque releasing type clutch apparatus comprises an outer ring, an inner ring arranged radially inside and coaxially with the outer ring and rotatably relative to the outer ring, a torque transmitting portion capable of transmitting torque between the outer ring and the inner ring, and a restricting mechanism for restricting excessive torque from being input from an input torque transmitting member to a driving ring of the outer ring and the inner ring and restricting excessive inverse torque that is input to a driven ring of the outer ring and the inner ring from being input to the input torque transmitting member. Treatment steps for securing strength of constituent members of the clutch apparatus in manufacturing be simplified or omitted.

Abstract: A clutch apparatus comprises a first race, a second race arranged coaxial with and rotatable relative to the first race, and an engagement mechanism provided between the first race and the second race for engagement of the first race and said second race. The engagement mechanism comprising a first clutch allowing rotation of the first race in only one direction, and a second clutch arranged axially adjacent to the first clutch, the second clutch comprising a rotary member that is provided on the second race in a rotatable and axially immovable manner and a movable member that is movable in the axial direction, and a cam mechanism disposed between the rotary member and the movable member, and the movable member being engaged with the first race by being moved in the axial direction by the cam mechanism.

Abstract: A structure of a ratchet type one-way clutch that enables a reduction of the installation space along the direction of the center axis and high torque setting. The structure includes a securing member arranged on the center axis of a ratchet type one-way clutch and having a holding portion opposed to the ratchet type one-way clutch in the axial direction. The outer race of the ratchet type one-way clutch is provided with a first fit portion including a plurality of through holes. The holding portion is provided with a second fit portion including a plurality of projections that is in fitting engagement with the first fit portions, respectively.