Suzuki Motor Corporation

Hisashi Ozeki

Akiteru Ogawa

Kentaro Kondo

Daisuke Maeda

Takashi Ito

Yuuta Kagawa

A variable valve device changes a valve lift amount in a cylinder head. The device includes: a camshaft having plural cams with different valve lift amounts; plural rocker arms in contact with the plural cams to move a valve; a switching mechanism that couples and separates the plurality of rocker arms by oil pressure; and an oil control valve that control the oil pressure. The switching mechanism includes a coupling piston and a separation piston that are moved forward and backward by the oil pressure. The plural rocker arms are coupled to one another along forward movement of the coupling piston. The plural rocker arms are separated from one another along forward movement of the separation piston. The oil control valve moves the coupling piston forward at a predetermined rotation phase of the camshaft and moves the separation piston forward at a predetermined rotation phase of the camshaft.

Variable valve device

A variable valve device includes a pair of cam housings separated from each other in a predetermined direction, a pair of rocker shafts supported by the pair of cam housings, a plurality of rocker arms supported by the pair of rocker shafts in a swingable manner, a switching mechanism that couples and separates intake arms, and an upper housing on the pair of cam housings. The upper housing is formed with a first injection hole for supplying lubrication oil to the switching mechanism and a second injection hole for supplying lubrication oil to the rocker arms. A passage length from a lubrication groove around a camshaft to the second injection hole is larger than a passage length from the lubrication groove to the first injection hole.

A variable valve device changes a valve lift amount in a cylinder head. The device includes: a camshaft having plural cams with different valve lift amounts; plural rocker arms in contact with the plural cams to move a valve; a switching mechanism that couples and separates the rocker arms by oil pressure; and an oil control valve that controls the oil pressure. The switching mechanism includes a hydraulic piston moveable forward and backward to couple and separate the rocker arms. First and second oil passages extend from the oil control valve to the hydraulic piston. The first oil passage includes an oil groove through which oil is allowed to pass at a predetermined rotation phase of the camshaft. The second oil passage is closed by the hydraulic piston after the rocker arms are separated from one another along the backward movement of the hydraulic piston.

A variable valve device includes a pair of cam housings separated in a predetermined direction, a rocker shaft supported by the pair of cam housings, rocker arms supported by the rocker shaft, a connecting pin disposed in a pin hole of one of the rocker arms, a return pin disposed in a pin hole of another of the rocker arms, a pressing member that causes the connecting pin to push the return pin to the other side, a repulsive member that causes the return pin to push back the connecting pin to one side, and an upper housing supported at both ends by upper surfaces of the pair of cam housings. In the variable valve device, the upper housing is formed with a first accommodation hole in which the pressing member is disposed and a second accommodation hole in which the repulsive member is disposed.

There is provided an installation structure for an oil control valve configured to control a hydraulic pressure to a variable valve device, in an engine in which a cylinder head cover is provided on a cylinder head, and the variable valve device that is configured to change an opening and closing timing of a valve by a hydraulic pressure is mounted. The installation structure includes: a first slope that slopes upward and rearward from a front end on an upper surface of the cylinder head cover; and a second slope that slopes downward and rearward from a rear end of the first slope on the upper surface of the cylinder head cover. A radiator is installed in front of the cylinder head cover, and the oil control valve is installed on the second slope.

Installation structure for oil control valve

A variable valve device can change valve operations of a cylinder head in which a cam chain is disposed at a center in a predetermined direction where cylinders are arranged and spark plugs are arranged by recessing outer walls on both sides in the direction in a concave shape. The device includes, for each cylinder, a rocker shaft extending along the direction, rocker arms supported by the rocker shaft, a connecting pin disposed in a pin hole of one of the rocker arms, a return pin disposed in a pin hole of the other of the rocker arms, a pressing member that causes the connecting pin to push the return pin, and a repulsive member that causes the return pin to push back the connecting pin, and the pins and the members are separated from the plug in a direction orthogonal to the direction in a plan view.

There is provided a variable valve device provided in a cylinder head and capable of changing a valve lift amount, including: a camshaft on which a plurality of cams with different valve lift amounts are formed; a switching mechanism configured to switch a cam for moving a valve among the plurality of cams; and an oil control valve configured to control an oil pressure for the switching mechanism. Oil starts to be supplied from the oil control valve to the switching mechanism at an end timing of a valve lift or in a zero range in which no valve lift occurs.

There is provided a variable valve apparatus including: a plurality of rocker arms; a coupling pin disposed in a housing hole of the rocker arm closer to one side; a release pin disposed in a housing hole of the rocker arm closer to the other side; a pressing member; a transmission member; and a push-back member disposed so as to push back the transmission member from the other side. The pressing member is configured to push the coupling pin into the housing hole of the rocker arm closer to the other side to couple the plurality of rocker arms. The transmission member is configured to push back the coupling pin into the housing hole of the rocker arm closer to the one side to release a coupling of the plurality of rocker arms.

Variable valve apparatus

There is provided a lubricating structure for a power transmission mechanism in which a crankshaft is coupled to a piston disposed in a cylinder bore and in which power is transmitted from the crankshaft to a camshaft. The lubricating structure includes: an idler gear that is configured to transmit power from the crankshaft to the camshaft; and an idler gear shaft that supports the idler gear via a bearing. One end portion of the idler gear shaft protrudes into the cylinder bore, and an oil passage configured to guide oil from the cylinder bore to the bearing is formed in the idler gear shaft.

Lubricating structure for power transmission mechanism

There is provided a mounting structure of an oil control valve unit configured to control a hydraulic pressure to a variable valve timing device of an engine. The engine is supported by a vehicle body frame. A heat exchanger is mounted in front of the engine. The oil control valve unit is mounted at a side of the engine. A part of the vehicle body frame is arranged between the oil control valve unit and the heat exchanger in a front and rear direction.

Mounting structure of oil control valve unit and motorcycle

There is provided an assembling structure of an engine. An oil control valve unit is configured to control oil pressure in a variable valve timing device of the engine. The oil control valve unit is installed on a cylinder head. The cylinder head is assembled to a crankcase. An outer wall of the cylinder head is formed with an opening into which the oil control valve unit is partially inserted. A mating surface of the cylinder head and the crankcase is fastened by at least a pair of bolts spaced apart across the opening.

Assembling structure of engine and vehicle

There is provided a mounting structure of an oil control valve unit configured to control a hydraulic pressure to a variable valve timing device of an engine. The engine is provided with a transmission. A heat exchanger is mounted in front of the engine. The oil control valve unit is mounted at a side of the engine. A transmission cover configured to cover the transmission from a side bulges from a side surface of the engine and the oil control valve unit is mounted above the transmission cover.

There is provided a mounting structure of an oil control valve unit configured to control a hydraulic pressure to a variable valve timing device of an engine. The engine is supported by a vehicle body frame. The oil control valve unit is mounted to an outer surface of the engine. The oil control valve unit is detachably mounted to the outer surface of the engine avoiding the vehicle body frame.

An engine unit of a motorcycle includes a crankshaft, a piston, and a swing member. The crankshaft is housed in a crankcase in a direction such that a rotational center line is parallel to a vehicle-width direction. The piston is disposed above the crankshaft and reciprocates in an approximately up-down direction. The swing member is disposed forward of the crankshaft and the piston, coupled to the crankshaft by a coupling member, and swings in an approximately front-rear direction synchronized with a rotation of the crankshaft.

Saddle-ride type vehicle

A motorcycle having a crankcase supporting a crankshaft of an engine, a driving force transmission device at an intermediate position between the crankshaft and a driving wheel to transmit rotational force from the crankshaft, and a swing arm that swingably supports the driving wheel, wherein the driving force transmission device includes a continuously variable transmission provided with an endless flexible member stretched between a drive pulley and a driven pulley, and a continuously variable transmission case covering the continuously variable transmission, and wherein the swing arm includes a pivot portion provided on one end side of the swing arm to be swingably attached to a vehicle body frame or the crankcase, and a driving wheel support portion provided on another end side of the swing arm to rotatably support the driving wheel.

Growing community of inventors

Hamamatsu, Japan

Hisashi Ozeki