Abstract: An oil pump includes: a pump housing having a rotor accommodation space in an inner portion of the pump housing; a rotor accommodated in the rotor accommodation space; a shaft portion disposed inside the rotor; and a passage which is provided to straddle at least one of the pump housing and the rotor and the shaft portion and which communicates a pump chamber which is formed by the rotor inside the pump housing with an outside of the pump housing.

Abstract: An oil supply apparatus for a vehicle includes: an oil pump that supplies oil in an oil pan that stores the oil circulating in an engine; an oil supply passageway that supplies the oil from the oil pump to a lubricating part and a hydraulic actuating part of the engine; and a bubble separating unit that is provided in the oil supply passageway and separates bubbles contained in the oil.

Abstract: This oil pump includes a first volume-changing part provided between an inner rotor and an outer rotor and a second volume-changing part provided in the outer rotor. A plurality of outer rotor pieces, which is annularly connected to each other, of the outer rotor is circumferentially arranged in a state where a first engaging part and a second engaging part of the outer rotor pieces being adjacent to each other engage with each other such that a distance therebetween in a circumferential direction is variable.

Abstract: An oil pump includes: an inner rotor including external teeth; an outer rotor including internal teeth; a housing configured to accommodate the inner and outer rotors; an inlet port formed in the housing and configured to guide oil into a pump chamber between the external and internal teeth; an outlet port formed in the housing and configured to guide the oil to the outside of the pump chamber; and a discharge hole formed in the housing and configured to guide bubbles in the oil to the outside of the pump chamber. The discharge hole communicates with the pump chamber earlier than a timing when the pump chamber and the outlet port communicate with each other. The outlet port communicates with the pump chamber later than a timing when the pump chamber has a maximum volume.

Abstract: An oil supply apparatus for a vehicle includes: an oil pump that supplies oil in an oil pan that stores the oil circulating in an engine; an oil supply passageway that supplies the oil from the oil pump to a lubricating part and a hydraulic actuating part of the engine; and a bubble separating unit that is provided in the oil supply passageway and separates bubbles contained in the oil.

Abstract: This oil pump is equipped with a rotatable inner rotor that includes a vane-housing unit housing multiple vanes so as to be capable of sliding in the radial direction, a rotatable annular outer rotor that includes multiple vane-connecting parts connecting the tip ends of the multiple vanes on the outside in the radial direction, first volume-changing parts, which are provided between the inner rotor and the outer rotor, and a first volume of which is changed in response to eccentricity of the inner rotor with respect to the outer rotor, thereby providing a pumping function, and second volume-changing parts, which are provided in the outer rotor, and a second volume of which is changed by a change in the distance between adjacent vane-connecting parts in the circumferential direction in response to eccentricity of the inner rotor with respect to the outer rotor, thereby providing a pumping function.

Abstract: This oil pump includes a first volume-changing part provided between an inner rotor and an outer rotor and a second volume-changing part provided in the outer rotor. A plurality of outer rotor pieces, which is annularly connected to each other, of the outer rotor is circumferentially arranged in a state where a first engaging part and a second engaging part of the outer rotor pieces being adjacent to each other engage with each other such that a distance therebetween in a circumferential direction is variable.

Abstract: This oil pump is equipped with a rotatable inner rotor that includes a vane-housing unit housing multiple vanes so as to be capable of sliding in the radial direction, a rotatable annular outer rotor that includes multiple vane-connecting parts connecting the tip ends of the multiple vanes on the outside in the radial direction, first volume-changing parts, which are provided between the inner rotor and the outer rotor, and a first volume of which is changed in response to eccentricity of the inner rotor with respect to the outer rotor, thereby providing a pumping function, and second volume-changing parts, which are provided in the outer rotor, and a second volume of which is changed by a change in the distance between adjacent vane-connecting parts in the circumferential direction in response to eccentricity of the inner rotor with respect to the outer rotor, thereby providing a pumping function.

Abstract: A motorcycle has a large accommodating space and an enlarged capacity of a fuel filter. The motorcycle includes: a fuel tank disposed on the upper side of the rear wheel and on the rear side of the luggage box; a rear fender provided between the rear frames and, disposed between the luggage box and the rear wheel, and covering the rear wheel on the front and upper sides of the rear wheel; a fuel supply path; and a fuel secondary filter. The rear fender is so disposed that its front portion faces a rear wall of the luggage box, the front portion is inclined rearwardly upward so that the distance thereto from the rear wall increases along an upward direction, and the fuel secondary filter is disposed between the rear wall of the luggage box and the front portion of the rear fender.

Abstract: The motorcycle includes a power unit having an output shaft in a crankcase of an internal combustion engine, a fuel injection system mounted to the power unit, the fuel tank, the fuel pump unit by which a fuel in the fuel tank is supplied to the fuel injection system through a fuel passage, the fuel filter device connected to the fuel passage on the downstream side relative to the fuel pump unit, and a shock absorber provided in a vertically oriented state on the front side of a rear wheel. The fuel supply system for the motorcycle includes the fuel pump unit being disposed outside the fuel tank, on the rear side of the output shaft and on the front side of the rear cushion, and the fuel filter device is disposed on the upper side of the crankcase.

Abstract: A scooter-type vehicle can freely set a capacity of a fuel filter without being restricted by swing of a unit-swing type engine. A cross pipe is spanned between a pair of left and right lower frames and a lower end of a down frame is connected to a central portion of the cross pipe. A fuel filter is disposed so that its lower end is higher by distance than the lower end of cross pipe. The fuel filter is disposed between the down frame and the fuel tank. Since the fuel filter is disposed in front of the fuel tank, it is not restricted by the swing of an engine located rearward of the fuel tank. Therefore, a capacity of the fuel filter can freely be set.

Abstract: A relief valve includes a valve body having a first port through which fluid flows in and a second port through which the fluid is discharged, a sleeve arranged so as to be slidable within the valve body and formed with an inlet being communicatable with the first port and an outlet being communicatable with the second port, a valve being slidable within the sleeve by receiving a fluid pressure of the first port flowing through the inlet in order to establish a closing state at which the outlet is closed by the valve and an opening state at which the outlet is opened, a biasing member applying a biasing force to the valve and a valve position adjusting mechanism actuated for operating the fluid pressure of the first port so as to act on the sleeve in a direction of the biasing force of the biasing member and changing the position of the sleeve relative to the valve body by turning on or off the operation of the fluid pressure of the first port so as to act on the sleeve.

Abstract: A scooter-type vehicle can freely set a capacity of a fuel filter without being restricted by swing of a unit-swing type engine. A fuel supply device includes a fuel tank and a fuel supply passage for supplying fuel to an engine. A pump-anterior filter for purifying the fuel in the fuel tank, a fuel pump, a fuel filter disposed on the downstream side of the fuel pump, and an injector for injecting fuel are arranged on the fuel supply passage in this order. The fuel filter is disposed between the upper surface of the fuel tank and the step floor. The size of the fuel filter can freely be set without being restricted by swing of the engine located rearward of the fuel tank.

Abstract: An evaporated fuel vapor from a fuel tank is fed through a charging pipe into an evaporated fuel storage canister, and is reserved there. The charging pipe, an upstream end of which is disposed in the fuel tank, is set to penetrate a side wall of the fuel tank and extends from the inside to the outside of the fuel tank. The canister is disposed in a swell-shaped recess on the inside of the front cowl, which recessed portion is situated between the headlight and the fuel tank as seen in side view.

Abstract: A scooter-type vehicle can freely set a capacity of a fuel filter without being restricted by swing of a unit-swing type engine. A fuel supply device includes a fuel tank and a fuel supply passage for supplying fuel to an engine. A pump-anterior filter for purifying the fuel in the fuel tank, a fuel pump, a fuel filter disposed on the downstream side of the fuel pump, and an injector for injecting fuel are arranged on the fuel supply passage in this order. The fuel filter is disposed between the upper surface of the fuel tank and the step floor. The size of the fuel filter can freely be set without being restricted by swing of the engine located rearward of the fuel tank.

Abstract: The motorcycle includes a power unit having an output shaft in a crankcase of an internal combustion engine, a fuel injection system mounted to the power unit, the fuel tank, the fuel pump unit by which a fuel in the fuel tank is supplied to the fuel injection system through a fuel passage, the fuel filter device connected to the fuel passage on the downstream side relative to the fuel pump unit, and a shock absorber provided in a vertically oriented state on the front side of a rear wheel. The fuel supply system for the motorcycle includes the fuel pump unit being disposed outside the fuel tank, on the rear side of the output shaft and on the front side of the rear cushion, and the fuel filter device is disposed on the upper side of the crankcase.

Abstract: A motorcycle has a large accommodating space and an enlarged capacity of a fuel filter. The motorcycle includes: a fuel tank disposed on the upper side of the rear wheel and on the rear side of the luggage box; a rear fender provided between the rear frames and, disposed between the luggage box and the rear wheel, and covering the rear wheel on the front and upper sides of the rear wheel; a fuel supply path; and a fuel secondary filter. The rear fender is so disposed that its front portion faces a rear wall of the luggage box, the front portion is inclined rearwardly upward so that the distance thereto from the rear wall increases along an upward direction, and the fuel secondary filter is disposed between the rear wall of the luggage box and the front portion of the rear fender.

Abstract: A scooter-type vehicle can freely set a capacity of a fuel filter without being restricted by swing of a unit-swing type engine. A cross pipe is spanned between a pair of left and right lower frames and a lower end of a down frame is connected to a central portion of the cross pipe. A fuel filter is disposed so that its lower end is higher by distance than the lower end of cross pipe. The fuel filter is disposed between the down frame and the fuel tank. Since the fuel filter is disposed in front of the fuel tank, it is not restricted by the swing of an engine located rearward of the fuel tank. Therefore, a capacity of the fuel filter can freely be set.

Abstract: An evaporated fuel vapor from a fuel tank is fed through a charging pipe into an evaporated fuel storage canister, and is reserved there. The charging pipe, an upstream end of which is disposed in the fuel tank, is set to penetrate a side wall of the fuel tank and extends from the inside to the outside of the fuel tank. The canister is disposed in a swell-shaped recess on the inside of the front cowl, which recessed portion is situated between the headlight and the fuel tank as seen in side view.

Abstract: A relief valve includes a valve body having a first port through which fluid flows in and a second port through which the fluid is discharged, a sleeve arranged so as to be slidable within the valve body and formed with an inlet being communicatable with the first port and an outlet being communicatable with the second port, a valve being slidable within the sleeve by receiving a fluid pressure of the first port flowing through the inlet in order to establish a closing state at which the outlet is closed by the valve and an opening state at which the outlet is opened, a biasing member applying a biasing force to the valve and a valve position adjusting mechanism actuated for operating the fluid pressure of the first port so as to act on the sleeve in a direction of the biasing force of the biasing member and changing the position of the sleeve relative to the valve body by turning on or off the operation of the fluid pressure of the first port so as to act on the sleeve.