148results about "Resilient element transmission" patented technology

An all terrain vehicle has a lubrication system that draws from an oil pan and lubricates the main bearings and the piston. A drive shaft for the vehicle is positioned outside of the oil pan such that the oil pan's lateral dimension may be decreased. Additionally, a lubricant pump pickup is located within a recess in the bottom of the oil pan such that the pick-up is at about the same vertical height as the lower surface of the crankcase. The vehicle is also shiftable from two-wheel drive to four-wheel drive. The shifting mechanism is located within the crankcase or transmission case. A locking collar selectively engages or disengages two of the four wheels from the output.

An all terrain vehicle has a crankcase cover and shaft supporting arrangement through which a shaft of a transmission is mounted between the crankcase and a crankcase cover. The arrangement includes a spider bracket having a bearing carrier and a cover member attached to the crankcase through the spider arrangement. The crankcase cover is preferably made of a less thermally conductive material as compared to the spider.

In order to reduce the influences of engine heat and vibration on a shift actuator, a shift actuator is disposed apart from the engine and the transmission on a vehicle. In particular a straddle-type vehicle, the vehicle includes a head pipe and a body frame including a main frame that extends rearward from the head pipe. The engine is suspended by the body frame 2 and a transmission is disposed next to the engine. The transmission includes a shift mechanism having a multiple-step speed change gear and a clutch mechanism that interrupts the transmission of rotation at the switching of the speed change gear of the transmission 40. An automatic transmission control unit operates the clutch mechanism and switches the speed change gear of the transmission automatically. The automatic transmission control unit includes the shift actuator which is mounted to the body frame and is disposed opposite to the transmission with the body frame therebetween, as viewed from the side of the vehicle, for operating the shift mechanism. A shift rod joins together the shift mechanism and the shift actuator.

A continuously variable transmission for bicycles having a transmission mechanism including a plurality of link units for converting rotary motion of an input shaft rotated by a pedal-operated crankshaft into swinging motion, and a one-way clutch for converting the swinging motion into rotary motion of an output shaft. The link units have drive links pivotally mounted on an eccentric ring which rotates in unison with the input shaft. The continuously variable transmission is disposed between a front wheel and a rear wheel of a bicycle in the longitudinal direction thereof and disposed either upwardly of a hypothetical plane which contains the axes of rotation of the front wheel and the rear wheel or upwardly of a position below and near the hypothetical plane. The transmission so configured provides better bicycle maneuverability, lower cost, while suffering almost no danger of contacting the ground.

An engine includes a crankshaft for transmitting rotational drive power to a drive wheel, a clutch mechanism for connecting or disconnecting the transmission of rotational drive power of the crankshaft, and clutch actuators. The crankshaft, clutch mechanism, and clutch actuators are accommodated in an engine case. The clutch actuators control the clutch mechanism and are positioned outside the clutch mechanism, viewed from the crankshaft direction.

A motorcycle shifting arrangement is connected to a transmission of the motorcycle for shifting the transmission between a higher gear and a lower gear. The motorcycle includes an original shifting structure having an original shift member pivotally mounted on an original pivot shaft coupled to the transmission at a location adjacent a foot rest attached to a bottom portion of the motorcycle. A supplemental shifting structure is pivotally attached relative to a supporting structure at a forward location on the motorcycle and has a foot engaging shift member adjacent the foot rest for permitting shifting of the motorcycle between higher and lower gears while the motorcycle operator has a foot supported on the foot rest by applying downward force of the operator's toe on either of the original shift member or the foot engaging shift member of the supplementary shifting structure.

A shifting system for a motorcycle includes a shift link mechanism for transmitting operational force during a gear shifting operation. The shift link mechanism is arranged between a shift spindle and a change pedal operated by a shifting movement. A motion capture mechanism is provided on the shift link mechanism so as to transmit the operational force from the change pedal to the shift spindle via an resilient member including a compressive coil spring.

In order to reduce the influences of engine heat and vibration on a shift actuator, a shift actuator is disposed apart from the engine and the transmission on a vehicle. In particular a straddle-type vehicle, the vehicle includes a head pipe and a body frame including a main frame that extends rearward from the head pipe. The engine is suspended by the body frame 2 and a transmission is disposed next to the engine. The transmission includes a shift mechanism having a multiple-step speed change gear and a clutch mechanism that interrupts the transmission of rotation at the switching of the speed change gear of the transmission 40. An automatic transmission control unit operates the clutch mechanism and switches the speed change gear of the transmission automatically. The automatic transmission control unit includes the shift actuator which is mounted to the body frame and is disposed opposite to the transmission with the body frame therebetween, as viewed from the side of the vehicle, for operating the shift mechanism. A shift rod joins together the shift mechanism and the shift actuator.

A saddle-type vehicle has an engine unit with a continuously variable transmission. The transmission has a primary sheave and a secondary sheave that are connected by a flexible transmitter such as a belt. The primary sheave, the secondary sheave and the belt are positioned in a transmission case. A starting kick shaft is positioned on the same side of the engine unit as the transmission case but the starting kick shaft is positioned outside of a profile of the transmission case when the engine unit is viewed from a lateral side.

A motorcycle has a frame and a power unit. The frame comprises a main frame member extending rearward from a steering head pipe. The power unit comprises a drive source, power transmission devices attached to the output end of the drive source, and a casing that houses the power transmission devices and that is suspended from the main frame member. The casing of the power unit comprises a recess opening toward the main frame member. A boss is formed on the bottom of the recess and is suspended from the main frame member.

A straddle-type vehicle with enhanced heat exhaust efficiency in a transmission case housing a continuously variable transmission. The continuously variable transmission and an engine are arranged forward of a rear wheel 4. An air intake duct introduces outside air into the transmission case and an air exhaust duct exhausts air from the transmission case. The air exhaust duct is connected to and extends upward from a top portion of the transmission case. The air exhaust duct has an air exhaust port that is positioned above the transmission case.

A motorcycle has a final drive, including a flexible drive member, such as a chain or a belt, that extends between the drive pulley and the driven pulley. A belt retention member is positioned proximate a forward portion of the final drive to reduce the likelihood of the belt skipping free of the drive pulley. The belt retention member preferably includes an upper belt retention portion and a lower belt retention portion. Preferably, the upper drive retention portion is positioned further forward relative to the lower belt retention portion such that the upper portion is moved more forward relative to an axis of rotation of the pulley. In this manner, the belt retention member allows more slack to be thrown during rapid acceleration from a decelerated state in the illustrated motorcycle.

A hybrid motorcycle capable of mounting thereon a hybrid-type drive unit, which does not project in a vehicle width direction and can be mounted even on a motorcycle having a limited vehicle width, includes a power distributing device positioned between a generator and a motor, and a reduction device arranged rearwardly of the power distributing device. A front end of a drive-wheel transmission device is journaled on a rear end of a central storage casing so that a rear end side of the drive-wheel transmission device is vertically swingable, and a rear wheel is journaled on the rear end of the drive-wheel transmission device. The power distributing device includes a sun gear, planetary gears, a planetary carrier, and a ring gear. Further, a carrier shaft projects from a rotor shaft and rotation of a crank shaft is transmitted through a intermediate gear portion to the projecting end of the carrier shaft.

A shaft type motorcycle includes a drive shaft for permitting a reduction in the vehicle weight. The shaft drive type motorcycle includes a gear box provided at a rear part of a swing arm with a bearing provided between the gear box and a rear wheel axle. The bearing includes an outer race and balls and an inner race operative provided to rotatably support the rear wheel axle. A presser flange is provided between the rear wheel axle and a rear wheel that includes a hollow cylindrical part pressing the inner race in the axial direction of the rear wheel axle. A flange part is provided as part of the presser flange to which a brake disc is mounted. A labyrinth structure is provided for making it difficult for oil from leaking out of the gear box.

A shift actuator comprises a drive shaft and a housing that rotatably supports the drive shaft. A shift position detecting apparatus detects a rotational position of the drive shaft. The drive shaft is connected to a shift mechanism by an operating lever and a shift rod. The operating lever and the housing are respectively formed with a through hole and a bottomed hole. The drive shaft can be temporarily secured in rotational position by inserting a lever positioning pin into the through hole and the bottomed hole. When secured, the shift position detecting apparatus can be attached to the housing and a length of the shift rod can be adjusted.

A versatile vehicle speed sensor compactly disposed on the outside in a radial direction of a gear. A motorcycle includes a power unit having a torque take-out shaft for outputting a torque generated by an internal combustion engine as a drive torque for driving a rear wheel, a torque transmission mechanism T which includes a gear pair consisting of bevel gears and a drive shaft and which transmits the drive torque to the rear wheel, and a vehicle speed sensor such that teeth of a driven gear constituting the gear pair constitute a portion to be detected. The vehicle speed sensor includes a main body portion having a detecting portion opposed to the addendum of the teeth in the direction of a normal to the addendum cone surface of the driven gear, and the main body portion extends along the normal direction.

A clutch failure detector is provided for detecting failure of an automatic clutch system. The clutch failure detector can include a current value detector and a determination device. Upon turning ON a main switch, an operation to disengage and engage a clutch can be performed by a clutch actuator, and a totalized value of current supplied to a clutch actuator can be calculated for a specific period of time while the clutch is in the process of engaging in the operation to disengage and engage the clutch. The totalized value can be compared with a preset threshold, and if a difference between the totalized value and the threshold is equal to or greater than a given value, it is determined that an automatic clutch system has a failure.

To simplify the switching between an automatic shift mode and a manual shift mode in a CVT. A selector switch is included in a switch unit provided on a handle bar at a position near a right grip and a shift switch is included in a switch unit provided on the handle bar at a position near a left grip. When the manual shift mode is selected, the shift switch functions as a shift control switch, whereas when the automatic shift mode is selected by the selector switch, mode selection for selecting any one of a first drive mode and a second drive mode, for example, can be made by the shift switch.

The invention prevents a decrease in a bank angle while cornering and reduces damage incurred to an AMT mechanism when tumbling over. A motorcycle 1 includes a cylinder block 47 of an engine, a crankcase 49 located below this cylinder block 47, a transmission 55 located behind this crankcase 49 and provided with a multistage shifting mechanism having multistage change gears, a clutch for connecting / disconnecting transmission of rotation when shifting the change gears of this transmission 55, and an AMT mechanism 63 for automatically actuating this clutch and shifting the change gears of the transmission 55. Since this AMT mechanism 63 is located behind the cylinder block 47 and above the transmission 55, a decrease in the bank angle is prevented while cornering, and fatal damage to the AMT mechanism 63 can be reduced when the motorcycle 1 tumbles over.

A straddle-type vehicle with enhanced heat exhaust efficiency in a transmission case housing a continuously variable transmission. The continuously variable transmission and an engine are arranged forward of a rear wheel 4. An air intake duct introduces outside air into the transmission case and an air exhaust duct exhausts air from the transmission case. The air exhaust duct is connected to and extends upward from a top portion of the transmission case. The air exhaust duct has an air exhaust port that is positioned above the transmission case.

A sub-frame of a motorcycle is attached to the rear end of a main frame of the motorcycle and extends rearward. An AMT (Automated Manual Transmission) mechanism is attached to the sub-frame which prevents direct conduction of heat and vibrations generated by an engine on the main frame to the AMT. The AMT mechanism includes a hydraulic clutch actuator, a hydraulic shift actuator, an accumulator, a valve block, a pump, and an oil tank.

A vehicle is described with a frame having a plurality of frame members. An engine and a straddle seat are disposed on the frame, the straddle seat accommodating a rider. A handlebar is disposed on the frame for steering the vehicle. A front suspension with at least one front wheel is disposed on the frame. A rear suspension is also disposed on the frame, the rear suspension having a rear swing arm pivotally connected to the frame and a shock absorber disposed between the frame and the rear swing arm. At least one rear is wheel disposed on the rear swing arm. A continuously variable transmission operatively connects the engine to the rear wheel. The continuously variable transmission includes a housing that acts as one of frame members.

A two wheeled vehicle has a frame assembly. The frame assembly comprises a backbone style frame. A power unit is mounted to the frame. A space is defined between the power unit and the frame such than an auxiliary component can be positioned within the space.

A motorcycle has a duct that is simple in construction to introduce cooling air into a belt chamber while simultaneously preventing invasion of dust, etc. into the belt chamber. A rear fender defines a wall that separates the seat and a rear tire. An outside-air intake port of the duct is arranged in a space formed between the seat and the wall.

A drive unit includes an engine, a generator, an electric motor and a power distributing device. The engine drives the generator to generate electric power. The electric motor is driven by the electric power generated by the generator and rotates a drive wheel. The power distributing device distributes the drive power generated by the engine between the generator and the drive wheel. A crankshaft of the engine can extend in a transverse direction of the vehicle. The generator, the motor and the power distributing device are disposed on a shaft, which is different from the crankshaft and extends substantially parallel to the crankshaft. The power of the engine and the drive force of the motor are output from a portion of the shaft through the power distributing device and the rotor of the motor.

Idle running of a drive wheel of a motorcycle is prevented without complicating the motorcycle structure. The motorcycle includes an engine, a drive wheel, a centrifugal clutch, a brake lever, a control unit for detecting actuation and de-actuation of the brake lever, a main stand that can be switched between a stored state where the rear wheel contacts a road surface and an upright state where the rear wheel is lifted off the road surface, and a main stand switch for detecting the upright and stored states. Engine operation inhibition control executed in the upright state permits operation of the engine when the brake lever is actuated and inhibits operation of the engine when the brake lever is not actuated.