Abstract: Provided is a rotary damper having a first valve provided in a first oil passage, the rotary damper including an oil chamber filled with oil; a vane located in the oil chamber; a groove which is formed in the vane and functions as a valve box of the first valve; a valve body of the first valve which moves while being in contact with a bottom surface of the groove; and an elastic body which applies elasticity to the valve body, and causes the valve body to come into contact with a wall surface of the oil chamber when the oil does not flow, in which the bottom surface of the groove is a slope, and thereby the valve body which is in contact with the wall surface when receiving oil pressure from one direction moves away from the wall surface when receiving the oil pressure from an opposite direction.

Abstract: Provided is a versatile platform having high versatility without increasing its weight. A versatile platform is used for a transport vehicle for crops, a security robot, or the like. The versatile platform includes a first axle, a second axle, a pair of first wheels and, a pair of second wheels and, motors and for driving the four wheels, a first steering portion for steering the first wheels, a second steering portion for steering the second wheels, and a battery support portion. A vehicle body frame integrally joins the first axle and the second axle and supports a work unit for performing operation. The vehicle body frame includes horizontal bar members and vertical bar members and is formed into a frame shape. The whole upper surface of the vehicle body frame is exposed to the outside.

Abstract: A ball sheet is formed in a manner such that an inclined surface is inclined relative to an axis-perpendicular direction (B) at a first inclination angle (?). A projecting part projecting at an outer edge portion of an opening part of a sheet body of the ball sheet in the axis-perpendicular direction (B) is supported by a supporting part inclined relative to the axis-perpendicular direction (B). A swaged part is deformed by swaging so as to be inclined relative to the axis-perpendicular direction (B) along a specified third inclination angle (?) larger than the first inclination angle (?). The projecting part is clamped between the supporting part and the swaged part at a position corresponding to at least a part of the inclined surface that is inclined to a tip side of the projecting part relative to the axis-perpendicular direction (B) along the specified first inclination angle (?) toward an outer edge portion on the sheet body side.

Abstract: To provide a braking device that achieves unidirectionality without limiting the direction of rotation of a rotor. The present invention is characterized by being equipped with a housing (10), a rotor (20) provided inside the housing (10), brake shoes (30) provided between the rotor (20) and the housing (10), first protruding parts (40) that move together with the brake shoes (30), and second protruding parts (50) that move in conjunction with the rotation of the rotor (20), with the first protruding parts (40) riding up on the second protruding parts only when the rotor (20) rotates in the normal direction, and thereby generating greater friction between the brake shoes (30) and the housing (10) than the friction that can be generated between the brake shoes (30) and the housing (10) when the rotor (20) rotates in the reverse direction.

Abstract: A ball joint includes a bearing seat in the form of a resin ball seat provided within a seat-accommodating portion of a metal socket for slidably and rotatably receiving a ball portion of a ball stud. An end portion of the seat-accommodating portion through which the stud portion passes extends towards the stud portion beyond the spherical center of the ball portion. The ball seat has a covering portion formed on the outer side of a seat opening portion of a ball-accommodating portion which has a spherical shape conforming to a sliding surface of the ball portion of the ball stud. The covering portion is formed by bending the seat opening portion such that it covers the outer periphery of the opening portion of the seat-accommodating portion of the socket.

Abstract: A ball joint has a dust cover fitted onto the outer periphery of a socket formed into the shape of a cylinder with a bottom. The socket has a dust cover groove into which a socket-fitting portion of the dust cover is fitted, and a dust cover-recieving surface for supporting a socket-facing surface of the dust cover. The dust cover-recieving surface inclines toward the socket-facing surface while extending from the outer side toward the inner side. Radial projections are formed on the inner peripheral surface of the socket-fitting portion of the dust cover. An axial projection which projects toward the dust cover-recieving surface is formed on the socket-facing surface of the dust cover.

Abstract: A housing and a ball joint including the housing are provided. The housing includes a holding part which holds an end portion of a dust cover and which can be formed at a low cost by deforming only a deformed part reliably without requiring additional process. A receiving part is provided on an upper end side of a housing body. A deformed part is provided at an upper end portion of the housing body to be adjacent to the receiving part. A sum of an angle of the outer peripheral surface of the receiving part relative to an axis-perpendicular direction of the housing body and an angle of the outer peripheral surface of the deformed part relative to the axis-perpendicular direction is set to be less than 180°.

Abstract: To provide a braking device that achieves unidirectionality without limiting the direction of rotation of a rotor. The present invention is characterized by being equipped with a housing (10), a rotor (20) provided inside the housing (10), brake shoes (30) provided between the rotor (20) and the housing (10), first protruding parts (40) that move together with the brake shoes (30), and second protruding parts (50) that move in conjunction with the rotation of the rotor (20), with the first protruding parts (40) riding up on the second protruding parts only when the rotor (20) rotates in the normal direction, and thereby generating greater friction between the brake shoes (30) and the housing (10) than the friction that can be generated between the brake shoes (30) and the housing (10) when the rotor (20) rotates in the reverse direction.

Abstract: A bearing seat for a ball joint which simplifies the process of joining a housing and a bearing seat and makes it easy to guarantee the stiffness necessary for a ball joint as a whole by making it easy to fill the interior of an undercut groove with a softened or molten material and a ball joint having this bearing seat for a ball joint are provided. The ball joint 100 has a bearing seat in the form of a ball seat 130 which receives a ball portion 113 of a ball stud 110 inside a cast housing 120 so that the ball portion 113 can slidably rotate. The ball seat 130 has an undercut groove 140 in its outer peripheral surface which contacts the inner peripheral surface of the housing 120. The undercut groove 140 is formed so that the inner width W2 of its bottom portion 142 is greater than the opening width W1 of the opening 141 and so that its depth D is shallower than the opening width W1 of the opening 141.

Abstract: A braking device capable of effectively causing a shearing stress of a magnetorheological fluid to act on both surfaces of the rotation body is provided.

Abstract: Provided is a ball joint in which a dust cover is fixed to a socket by a retaining ring and which has an improved waterproofing performance at a fitting region where the dust cover is fitted onto the socket. A ball joint 100 has a dust cover 140 fitted onto the outer periphery of a socket 120 formed into the shape of a cylinder with a bottom. The socket 120 has a dust cover groove 125 into which a socket-fitting portion 141 of the dust cover 140 is fitted, and a dust cover-receiving surface 126 for supporting a socket-facing surface 143 of the dust cover 140. The dust cover-receiving surface 126 inclines toward the socket-facing surface 143 while extending from the outer side toward the inner side. Radial projections 142 are formed on the inner peripheral surface of the socket-fitting portion 141 of the dust cover 140. Also, an axial projection 145 projecting toward the dust cover-receiving surface 126 is formed on the socket-facing surface 143 of the dust cover 140.

Abstract: A ball sheet is formed in a manner such that an inclined surface is inclined relative to an axis-perpendicular direction (B) at a first inclination angle (?). A projecting part projecting at an outer edge portion of an opening part of a sheet body of the ball sheet in the axis-perpendicular direction (B) is supported by a supporting part inclined relative to the axis-perpendicular direction (B). A swaged part is deformed by swaging so as to be inclined relative to the axis-perpendicular direction (B) along a specified third inclination angle (?) larger than the first inclination angle (?). The projecting part is clamped between the supporting part and the swaged part at a position corresponding to at least a part of the inclined surface that is inclined to a tip side of the projecting part relative to the axis-perpendicular direction (B) along the specified first inclination angle (?) toward an outer edge portion on the sheet body side.

Abstract: The present invention provides a rotary damper comprising a hollow housing (10) which is opened at its one end and completely closed at the other end by an end wall (11), a bearing (13) formed at the end wall (11), a shaft (20) fitted to the bearing (13), a plug (30) made of metal, having an aperture (31) supporting the shaft (20) and closing an opening in the housing (10), partitions (40) arranged inside the housing (10) for rotation in accordance with rotation of the housing (10), viscous liquid filling chambers (71 and 72) defined by the partitions (40), and metal vanes (51 and 52) arranged in the chambers (71 and 72) for rotation in accordance with the rotation of the shaft (20), wherein the vane (51 and 52) includes a check valve, the check valve includes a valve body (84), and the valve body (84) includes a stop 84c made of resin and arranged between the plug (30) and the vanes (51 and 52).

Abstract: A braking device capable of effectively causing a shearing stress of a magnetorheological fluid to act on both surfaces of the rotation body is provided. The present invention provides a braking device including a first soft magnetic material 1, a coil 3 attached to the first soft magnetic material 1, a second soft magnetic material 2, a activation chamber 4 formed between the first soft magnetic material 1 and the second soft magnetic material 2, and a rotation body 5 provided inside of the activation chamber 4, and a magnetorheological fluid 6 filling a gap between the rotation body 5 and the first soft magnetic material 1 and a gap between the rotation body 5 and the second soft magnetic material 2, wherein the rotation body 5 includes low magnetoresistive parts 5a, 5b made of a soft magnetic material and a high magnetoresistive part 5c in which a magnetic flux is less likely to flow, and the high magnetoresistive part 5c is provided at a portion of the rotation body 5 facing the coil 3.

Abstract: A braking device capable of generating a larger braking force is provided.

Abstract: A rotary damper has a cylindrical housing. A rotor is rotatably supported inside the housing for rotation with respect to the housing by a first bearing and a second bearing. The second bearing has a greater length in the axial direction of the rotor than the first bearing. The rotary damper can be employed in an opening and closing mechanism for a vehicle door.

Abstract: The present invention provides a rotary damper in which both yields and braking characteristics can be enhanced. The rotary damper of the invention includes a valve mechanism which comprises an operating chamber 7 through which fluid can pass, a valve body 8 which forwardly moves from a natural state position when the valve body 8 receives fluid pressure and which can forwardly moves in the operating chamber 7, and a first spring 9 capable of giving a resistance to the forward movement of the valve body 8. The valve mechanism can reduce a flow rate of fluid which passes through the operating chamber 7 by a flow path 14 formed between the valve body 8 and a peripheral wall 7a of the operating chamber 7. A reducing amount of fluid can be increased as a moving distance of the valve body 8 which forwardly moves in the operating chamber 7 is increased.