Abstract: A steering device includes a fixed bracket, a movable bracket, a friction plate, a first friction washer, a pressing plate, engagement units, a second friction washer, and a fastening tool. The friction plate is attached to face, with an appropriate gap, at least one of both fixed side portions of the fixed bracket. The first washer is inserted between the fixed side portion and the friction plate. The pressing plate is attached to an outer surface of the friction plate. The engagement unit causes the pressing plate to be detachably attached and be immovable at least in a vertical direction. The second friction washer is clamped between the pressing plate and the friction plate. The fixed bracket, the friction plate, the first friction washer, the second friction washer, and the pressing plate are connected by penetrating therethrough a lock bolt of the fastening tool.

Abstract: A pump rotor is an inner rotor of an internal gear pump, the inner rotor having a tooth profile, wherein a half-tooth portion of the tooth profile is formed of three tooth-profile formation circles that are elliptical or true-circular. Two of the tooth-profile formation circles are a combination of a small tooth-profile formation circle and a large tooth-profile formation circle in which the small tooth-profile formation circle is inscribed and is entirely included. A portion of the small tooth-profile formation circle forms an addendum portion of the half-tooth portion. A portion of the large tooth-profile formation circle in which the small tooth-profile formation circle is inscribed and is entirely included forms an engagement portion of the half-tooth portion. A portion of another tooth-profile formation circle that circumscribes the large tooth-profile formation circle forms a dedendum portion of the half-tooth portion.

Abstract: An internal gear pump in which an inner rotor and an outer rotor are arranged in a rotor housing chamber. A deepest meshing section is located in the vicinity on a line connecting a center of the inner rotor and a center of the outer rotor. A center of the rotor housing chamber is offset, from a position in which the center and the center of the outer rotor coincide with each other, to the deepest meshing section side by an amount smaller than a tip clearance, which is a gap between the tooth tip of the inner rotor and the tooth tip of the outer rotor in the vicinity of a seal land between a terminal end side of an intake port and a start end side of a discharge port.