Kawasaki Motors, Ltd.

Kawasaki Jukogyo Kabushiki Kaisha

Yuji Hida

Masaki Nishiyabu

Kyohei Izumi

Satoaki Ichi

Tetsuji Yamamoto

Ichiro Tanaka

Katsuya Sano

Kazuho Matsumoto

Yasuyuki Ioku

Hisatoyo Arima

Yoshiharu Matsuda

Jun Takagi

Takuya Noami

Hiroshi Kanmera

An engine includes a starter motor and a filter, both of which are positioned to a side of a cylinder that faces an exhaust port with respect to a direction that is perpendicular to both a reciprocating direction of a piston and an axial direction of a crankshaft. Moreover, the starter motor is positioned to a side of the cylinder that faces a crankcase, and the filter is positioned to a side of the starter motor that faces a cylinder head, with respect to the reciprocating direction of the piston.

Engine

A hybrid power unit includes: an internal combustion engine; a power transmitting shaft to which power from a crank shaft is transmitted and which is housed in a crank case; an electric motor including a motor driving shaft projecting from a motor housing toward a lateral side, the electric motor being located on an outer surface of the crank case; a linkage which extends through a through hole of the crank case and through which power from the motor driving shaft is transmitted to the power transmitting shaft; and a shaft cover defining a shaft space that houses a portion of the motor driving shaft which projects from the motor housing, the shaft cover being detachably fixed to the outer surface of the crank case so as to cover the through hole.

Hybrid power unit, hybrid straddle vehicle, and case of hybrid power unit

A utility vehicle including a transmission, the transmission including: at least one input shaft to which power from a drive source is input; an output shaft that outputs the power from the drive source to a drive wheel; a plurality of gear-position gear trains each including a drive gear provided on the input shaft and a driven gear provided on the output shaft; and an engaging clutch that brings a gear-position gear train into a power transmittable state. A one-way clutch that transmits rotation only in a direction from the drive source toward the drive wheel is disposed in a predetermined gear-position gear train having a maximum reduction ratio among the plurality of gear-position gear trains including the drive gears provided on the same input shaft.

Utility vehicle and transmission

A transmission includes: a transmission case having a partition wall defining a transmission chamber; a clutch cover that covers the partition wall and forms a clutch chamber adjacent to the transmission chamber with the partition wall interposed therebetween; a plurality of rotating bodies accommodated in the transmission chamber; a clutch that connects and disconnects a drive source output shaft to and from at least one of the rotating bodies, the clutch being accommodated in the clutch chamber; an actuator that is disposed in one of the transmission chamber and the clutch chamber and is driven by a pressure medium to be supplied; and a pressure circuit block that constitutes at least a part of a pressure circuit for applying pressure to the actuator via the pressure medium and is attached to the partition wall.

Transmission

A vehicle includes: a power unit including a transmission that changes the speed of rotation produced by output power of a drive source for travel and a case accommodating the transmission, the transmission including a pivotally supported change shaft, the change shaft being angularly movable about an axis to change a gear ratio of the transmission; and an operation unit that operates to angularly move the change shaft, the operation unit including an electric motor and a power transmission structure that transmits power of the electric motor to the change shaft in the form of rotational power by which the change shaft is angularly moved. The operation unit is mounted on an exterior of the case.

Vehicle

An engine unit includes a cylinder, a crankshaft, a crankcase, a generator, a sensor, and a coolant passage. The crankshaft is connected to a piston in the cylinder. The crankcase accommodates the crankshaft therein. The generator includes a rotor that rotates together with the crankshaft and a stator facing the rotor. The generator generates electric power by rotation of the rotor. The sensor detects a rotation position of the rotor. The coolant passage includes an ejection port, guides a coolant to the ejection port, and ejects the coolant from the ejection port toward the sensor.

Engine unit

A hybrid vehicle includes: a crankcase having a main chamber formed in a case body and accommodating at least a crankshaft, an input shaft, an output shaft, and a gear train, the crankcase further having a subsidiary chamber formed between the case body and a cover and accommodating at least a main clutch; a rotary member disposed in the subsidiary chamber so as to be capable of power transmission to the input shaft; and a power transmission member that transmits drive power from a drive motor to the rotary member.

Hybrid vehicle

A straddle vehicle includes: a shift drum that makes a shift change of a transmission including a plurality of gear trains; a transmission case enclosing the shift drum, the transmission case including a side wall portion provided with an insertion hole into which an end portion of the shift drum is inserted; and an actuator unit secured to an outer surface of the side wall portion, the actuator unit including a drive shaft that outputs drive power to rotate the shift drum, the drive shaft having the same rotational axis as the shift drum and being connected to the shift drum on the rotational axis.

Transmission mechanism including shift drum and actuator unit which are coaxially disposed

A straddle vehicle includes: a prime mover; a hydraulically actuated main clutch disposed in a power transmission route between the prime mover and a drive wheel; an oil control valve unit that controls flow of a hydraulic oil supplied to the main clutch; and a power unit case including a case body and a cover removably mounted on the case body, the power unit case accommodating at least the main clutch. The oil control valve unit is secured to the case body.

Straddle vehicle

A crankcase includes: a main body portion aligned with a drive motor in a direction perpendicular to a motor drive shaft; and an extended portion continuous with the main body portion and located lateral to a motor housing, the extended portion receiving insertion of one end of the motor drive shaft. A power transmission mechanism that transmits power from the motor drive shaft to an input shaft is located partly in a first region defined by the main body portion and partly in a second region defined by the extended portion and communicating with the first region.

A straddle vehicle includes: a prime mover; a hydraulically actuated main clutch; an oil control valve unit; a power unit case accommodating at least the main clutch; an oil pan mounted beneath the power unit case; a clutch-dedicated pump; a primary filter disposed in an oil passage between the oil pan and the clutch-dedicated pump; and a secondary filter disposed in an oil passage between the clutch-dedicated pump and the oil control valve unit. The primary filter and the secondary filter are mounted on a bottom surface of the power unit case and covered from below by the oil pan.

A hybrid vehicle includes: a crankcase extending from a lower portion of a cylinder of an engine, the crankcase including a main body portion defining a crank chamber in which a crankshaft of the engine is accommodated, the crankcase further including a breather portion projecting upwardly from the main body portion and defining a breather chamber into which blowby gas is introduced from the crank chamber; a breather tube that introduces the blowby gas from the breather chamber into the intake passage; and a drive motor disposed rearwardly of the cylinder and mounted on a top surface of the crankcase. The breather portion has a facing surface facing an outer peripheral surface of the drive motor. The facing surface of the breather portion is shaped to conform to the outer peripheral surface of the drive motor.

A breather structure of an engine having a crank case and a cylinder fastened to an upper side of the crank case can improve the strength of a cylinder and can prevent an increase of weight of the engine. The breather structure is provided with a breather chamber integrally formed with the cylinder in an outer peripheral wall of the cylinder, and the breather chamber separates air including an oil mist within the crank case into an oil component and a gas component, returns the oil component into an oil reservoir of the engine, and discharges the gas component out of the crank case.

Breather structure of engine

The present invention provides a generator cooling system of an engine which can supply sufficient cooling oil to a generator even during low speed operation, without complicating an oil passage formed within a wall of a crankcase. In the generator cooling system of the engine having a generator accommodated in a generator room which is formed at an end portion of the crankcase in a longitudinal direction of a crankshaft of the engine, the generator cooling system is provided with an oil passage formed to the crankcase in a position lower than an axis of the crankshaft, and an oil nozzle provided in the oil passage for injecting oil of the oil passage toward a lower portion within the generator room.

Growing community of inventors

Akashi, Japan

Yuji Hida