Abstract: An arm member and a method of manufacturing the arm member capable of ensuring strength in holding a ball part using a swaged part of a housing. An arm member includes a ball joint and an arm part. The ball joint has a ball stud including a ball part. The ball joint has a housing including a swaged part and holds the ball part inside the housing using deformation of the swaged part. The arm part has an arm part body made of discontinuous fiber-reinforced resin and continuous with the housing. The arm part has a covering part made of continuous fiber-reinforced resin and covering at least a part of the swaged part.

Abstract: Provided are a volume change compensation device capable of reducing a manufacturing burden with a simple configuration and a damper device including the volume change compensation device. A damper device 100 includes a rotary damper, and includes a volume change compensation device 140 in a shaft 121 of a rotor 120. The volume change compensation device 140 includes an inner cylinder piston 142 pressed by an inner cylinder piston pressing elastic body 145 in a body tube 141 communicating with a hydraulic fluid housing portion 103 of the damper device 100 through a connection path 141a. The inner cylinder piston 142 is formed in a bottomed cylindrical shape opening on a connection path 141a side. In the inner cylinder piston 142, an inner cylinder inner small piston 143 is pressed against a bottom portion 142b by a small piston pressing elastic body 144. An air hole 142c is formed at the bottom portion 142b of the inner cylinder piston 142.

Abstract: A ball joint includes a first lubricant interposed between a ball part of a ball stud and a bearing sheet. The ball joint includes a second lubricant having a higher friction coefficient than the first lubricant and enclosed inside a dust cover.

Abstract: A rotary damper includes a lid (130) that closes an opening of a case (110), a protrusion (131) formed on the lid (130), and a groove (114) having an arc shape formed on the case (110). A bottom surface of the groove (114) has a gradient. The protrusion (131) moves in the groove (114) while contacting the bottom surface of the groove (114), thereby displacing the lid (130).

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: An object is to provide a grease composition for a ball joint capable of reducing the starting torque, reducing the operating torque, and improving the low temperature property as compared with the related art. The grease composition for a ball joint according to the present invention contains a silicone oil as a base oil and an additive, and contains an amino-modified silicone and a modified polyolefin as the additive. The silicone oil preferably includes at least one of dimethyl silicone oil and phenyl-modified silicone oil.

Abstract: Provided is a rotary damper that can be easily changed in specifications and can be improved in economic efficiency by an existing rotary damper that can be continued to be used. A rotary damper 100 includes a main housing 101. The main housing 101 includes a module mounting portions 108 for detachably mounting the other functional module 200 to 500. The functional modules 200 to 500 respectively have module rotors 206, 306, 406 and 506 which are rotationally driven by receiving a rotational driving force from the outside, and module output portions 206b, 307a, 407a and 507a formed to be connectable to a main rotor 110, in module housings 201, 301, 401 and 501. Further, the functional modules 200 to 500 include input adjustment mechanisms 205, 305, 405 and 505 having a function of changing at least one of characteristics of the rotational driving force and modes of transmission of the rotational driving force, between the module rotors and the module output portions.

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.