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.

Abstract: The rotor of the present invention is capable of improving magnetic characteristics, general versatility and ease of assembly. The rotor comprises: a rotor shaft; a ring-shaped rotor magnet being disposed coaxially with the rotor shaft; and a non-magnetic cover covering an outer circumference of the rotor magnet. The rotor magnet and the cover are integral-molded with molding resin in a state where an outer circumference of the cover is exposed and both end parts and an inner circumference of the rotor magnet are covered with the molding resin.

Abstract: An unbalance correction device of a propeller shaft includes a propeller shaft configured by a plurality of annular dampers being elastic members mounted along an axial direction between a metallic outer shaft and a metallic inner shaft and a balance weight in which a primary weight plate part and an auxiliary weight plate part that are formed in an arc along a width direction and include a substantially quadrilateral planar shape are formed continuously and integrally along a longitudinal direction, and a protruding piece is protrusively formed on a concave arced surface on a rear surface side of the primary weight plate part and from each corner part at four locations. The primary weight plate part is disposed in a non-mounted area of the dampers at an axial direction end of the outer shaft coinciding with an axial direction of the outer shaft.

Abstract: A relief device includes a relief housing constituted by a relief inflow portion, a valve passage portion, a recess, and an oil discharge portion having a relief hole; a relief valve having a small-diameter portion between a first large-diameter portion and a second large-diameter portion; and a spring elastically biasing the relief valve toward the relief inflow portion. The recess is formed at a position that is closer to the relief inflow portion side than to the oil discharge portion, the axial length of the recess is larger than the axial length of the first large-diameter portion of the relief valve, and the shortest axial distance between the recess and the relief hole is less than the axial length of the small-diameter portion.

Abstract: An oil pump is increased to inhibit noise generation and durability is also improved. The oil pump includes a pump body, an inner rotor having outer teeth, and an outer rotor having inner teeth. A maximum partition portion is formed between a trailing end side of an intake port and a leading end side of a discharge port in a rotor chamber of the pump body. Among cells constituted by the outer teeth of the inner rotor and the inner teeth of the outer rotor, a central cell positioned in the location of the maximum partition portion and adjacent cells positioned before and after the central cell in the direction of rotation are sealed by mutual contact of the outer teeth and the inner teeth. The outer teeth and the inner teeth constituting cells other than the central cell and adjacent cells are not in contact with each other.

Abstract: A steering apparatus exhibits favorable lever operability and generates a powerful steering column fastening and fixing force during tilt and telescopic adjustment. It has a simple structure includes: a column supporting member; a fixed bracket having, fixed side portions; a lock bolt that penetrates the respective fixed side portions of the fixed bracket together with the column supporting member; a main driving cam; a driven cam; an intermediate cam; and an operating lever. The lock bolt penetrates the main driving cam, the driven cam, and the intermediate cam, the main driving cam is rotated by the operating lever, the driven cam is attached to the fixed side portions to be incapable of rotating, the intermediate cam is disposed between the main driving cam and the driven cam, and the intermediate cam is caused to approach and separate from the main driving cam and the driven cam.

Abstract: An oil pump includes: a rotor chamber; an outer rotor; and an inner rotor. A partition surface between a starting end side of the intake port and a terminal end side of the discharge port is set as a first seal land. An intake groove portion that projects from the starting end side of the intake port toward the terminal end side of the discharge port and a discharge groove portion that projects from the terminal end side of the discharge port toward the starting end side of the intake port are formed in positions which are located on the first seal land. The intake groove portion and the discharge groove portion are provided in intermediate tooth height direction positions of a meshing location between the inner rotor and the outer rotor.

Abstract: To provide a relief valve structure for an oil pump, which is capable of appropriately controlling/switching the discharge pressure and flow rate of oil to an optimum condition in low, middle and high speed regions of an engine. The relief valve structure has: a relief valve having formed therein a valve flow path for communicating between a valve head part and an outer circumferential side part; a valve housing in which a valve passage accommodating the relief valve is formed; a relief flow-in part formed on an axial direction one end side of the valve passage and communicating with the valve passage; a first discharge part formed in the valve housing and communicating with the valve flow path by the movement of the relief valve; and a second discharge part that is opened by allowing the valve head part to pass therethrough. The second discharge part is positioned nearer to the relief flow-in part than the first discharge part.

Abstract: A steering apparatus has a steering shaft 7, an inner column 2 that supports the steering shaft 7 via a bearing 81, an outer column A that embraces the inner column 2, a fixing bracket 1 that sandwiches the outer column A from both sides in a width direction, and a tightener 6 that tightens and releases the outer column A together with the fixing bracket 1. The inner column 2 has an embraced cylindrical section 21 that is embraced by the outer column A.

Abstract: A steering device includes: an inner column; an outer column that includes a left-right pair of outer column half bodies having holding surface portions formed on respective inner surface sides thereof, the two holding surface portions together constituting a holding inner peripheral surface for holding an outer peripheral surface of the inner column; a pivot bracket in which hanging side portions are formed on either width direction side of a pivot upper portion; a fixing bracket provided with fixing side portions on either width direction side; and a clamping tool. Respective width direction outside surfaces of the two outer column half bodies are sandwiched between the two hanging side portions of the pivot bracket, and the two fixing side portions of the fixing bracket are connected such that the two width direction outside surfaces of the two outer column half bodies can be clamped and released by the clamping tool.

Abstract: In a gear pump in which a driving rotor that is driven by a driving source meshes with a driven rotor that is driven by the driving rotor for rotation to pump a hydraulic oil, only one of the driving rotor and the driven rotor is given the steam treatment while the other remains untreated.

Abstract: The invention allows securing greater discharge pressure and flow rate at high revolutions of an engine in order to secure lubrication and cooling, while reducing discharge pressure and flow rate at low and medium revolutions of the engine in order to improve efficiency. The invention includes a housing; a relief valve; a valve passage; a main discharge flow channel; a main relief flow channel; an auxiliary relief flow channel; a solenoid valve mounted on the auxiliary relief flow channel; and a spring. The solenoid valve is controlled so as to switch between communication and shut-off between the auxiliary relief flow channel and the large-diameter passage section in accordance with an increase or decrease in engine revolutions, and oil in the large-diameter passage section is discharged when the shut-off is implemented.

Abstract: The invention has: a housing; a pump section formed of a drive gear unit and a driven gear unit; a main flow channel through which oil pressure is applied to the driven gear unit in a discharge volume reduction direction; a first branching flow channel through which oil pressure that assists oil pressure from the main flow channel is applied; a second branching flow channel through which oil pressure is applied to the driven gear unit in a discharge increase direction; a first flow channel control section; a second flow channel control section; and a spring that elastically urges the driven gear unit in a discharge increase direction. The first flow channel control section and the second flow channel control section can perform switching control in accordance with each increase or decrease of engine revolutions and in pressure.

Abstract: A steering apparatus includes a fixed bracket, an outer column, an arm unit, an inner column, a steering shaft, and a tightening tool. The outer column includes a main holding body portion, a divided portion, and a tightening portion. The arm unit includes by a bifurcated arm portion that extends axially outward in a substantially bifurcated shape at the axial front side of the main holding body portion and a linking portion formed between the arms of the bifurcated arm portion. The inner column is held by the outer column. The steering shaft is pivotally supported by the linking portion. Two tightening plate pieces of the tightening portion are disposed inside two fixed side portions of the fixed bracket and tightenably connected by the tightening tool.

Abstract: A steering device includes an outer column including fastening pieces formed to face each other at both sides, in the width direction, of a slot portion formed at either of a lower side or an upper side of an embracing body portion along an axial direction thereof, a fixed bracket clamping the outer column, a fastener that fastens the outer column and the fixed bracket, an inner column, and a pushing member having an expanding shaft portion. The two fastening pieces of the embracing body portion are connected by the fastener so that the two fastening pieces can be expanded and contracted, and the expanding shaft portion is elastically biased in an axial center direction of the outer column so as to abut on end zones of the slot portion and expand the two fastening pieces.

Abstract: A cooling device for an engine including a radiator circulation flow channel, a heater circulation flow channel, a bypass circulation flow channel, a valve, and a pump. The channels merge in the thermostat and form a common flow channel between the thermostat and the engine. The pump is provided in the common flow channel. At a start of a warm-up period and during the warm-up operation, circulation is substantially stopped by the thermostat, cooling water circulation is actuated in the bypass circulation flow channel, and an opening degree of the electronically controlled valve is gradually increased from a minimum as the cooling water temperature rises. The electronically controlled valve is not completely closed even when closed, and is open to a certain degree from an initial stage of the warm-up period, thereby causing part of the cooling water to flow in the bypass circulation flow channel.

Abstract: A tilt steering apparatus comprises a tilt adjusting mechanism in which a tilt lock release is established only when an oscillation-free end of an operating arm portion of a tilt operating lever is positioned toward a steering wheel side. Even when the tilt operating lever is oscillated to the steering wheel side, the tilt operating lever is prevented from returning under its own weight, thereby preventing it from being difficult to operate. The tilt steering apparatus is configured from an oscillation latch portion formed on the circumference of an oscillation center portion of an oscillation base portion of the tilt operating lever to move reciprocally in the circumferential direction, a hook portion formed in the movable bracket, and a spring that extends between the oscillation latch portion and the hook portion elastically urged in the direction of contraction. The centerline of the spring is able to pass through the oscillation center portion of the tilt operating lever as appropriate.

Abstract: An operation lever includes a lever main body A having a tapered insertion portion which has locking portions and in which the size in the up-down direction decreases gradually and an operation knob having a tapered insertion hole in which a size in the up-down direction decreases gradually from an opening toward a deep end wall surface. The insertion hole includes tapered reference surface facing each other in the up-down direction. Grooves are formed from the opening and along the deep end wall surface so as to protrude outward from the respective tapered reference surfaces and the inner side surfaces in the insertion hole of the operation knob. The insertion portion is inserted into the insertion hole and the locking portions bite in outward through the respective tapered reference surfaces.

Abstract: An oil pump unit with a variable flow rate includes lubrication pumps and a control pump that are driven by rotation of a crankshaft of an engine, and changes an oil supply amount from the control pump to each part of the engine, in which the control pump includes a plurality of oil pumps that have different discharge rates.