Abstract: A grip force of a driving wheel is maintained by identifying an actual condition of a motorcycle and controlling a clutch in a timely manner. A clutch control system includes a clutch, an actuator unit causing the clutch to engage or disengage, a rear wheel speed sensor, a front wheel speed sensor, a clutch lever sensor and a controller controlling a control motor based on a rear wheel speed and a front wheel speed. When the rear wheel speed is lower than the front wheel speed and an absolute value of a difference between the rear wheel speed and the front wheel speed is greater than a threshold value, the control motor is driven so as to reduce a transmission force of the clutch. When an operational amount of the clutch lever is greater than a threshold value, processing to reduce the transmission force of the clutch is suspended.

Abstract: A speed change control device for a transmission of an internal combustion engine includes a driving means having an electric motor for rotatably driving a shift drum. The electric motor has a rotation axis orthogonal to an axis of a shift drum. A barrel cam having a cam groove rotates about an axis parallel to that of the electric motor. A transmission rotation member is interlocked and is coupled to the shift drum so as to be rotatable about the axis orthogonal to the rotation axis of the barrel cam. The transmission rotation member is provided with a plurality of engagement pins that selectively engages the cam groove. The resulting configuration allows the electric motor to be disposed inwardly with respect to an outermost side of the body of the internal combustion engine in the direction of the axis of a shift drum and improves the shift accuracy.

Abstract: A shift control device in a saddle-ride-type vehicle includes a lost motion mechanism and a locking mechanism. The lost motion mechanism is disposed between a shift spindle and a shift drum and engages a shifter-side rotary member on a shift spindle side and a drum-side rotary member on a shift drum side, in a relatively rotatable manner while accumulating a force. The locking mechanism is engaged with the shifter-side rotary member and the drum-side rotary member, respectively, so as to restrict the rotation of the shifter-side rotary member and the rotation of the drum-side rotary member, individually.

Abstract: This gear shift device is used in a transmission of an engine, and is provided with: a shift drum that changes a speed change stage of the transmission according to a rotational position about an axis; an actuator having a driving shaft substantially orthogonal to the shift drum; a worm shaped barrel cam that is arranged parallel to the driving shaft of the actuator and that has a plurality of cam grooves on an outer circumference thereof; and a wheel gear that is coaxially fixed on the shift drum and that has a plurality of pins on an outer circumference thereof. At least a pair of each pin of the wheel gear and each cam groove of the barrel cam are engaged with each other, and the shift drum is rotated by the actuator via the barrel cam and the wheel gear, to thereby change the speed change stage of the transmission. The gear shift device is further with a detection device that detects a rotational position of the barrel cam.

Abstract: A clutch operation mechanism wherein when a clutch is disengaged and engaged by manual operation or by operation of an actuator the one operation does not affect the other operation. The clutch operation mechanism includes a lever side lost mechanism which is disposed between a clutch lever and a turn-operating force transmitting member for interrupting, from the clutch lever side, an operated-force applied from the turn-operating force transmitting member by driving the electric motor when the clutch lever is not operated. A motor side lost mechanism is disposed between the electric motor and the turn-operating force transmitting member and interrupts, from the side of the electric motor, the operated-force applied from the turn-operating force transmitting member by operating the clutch lever when the electric motor is not operated.

Abstract: A shift position changing drive member for a transmission includes an arm member capable of turning around the axis of a shift spindle for drivingly turning a shift drum in response to the turning of the shift spindle wherein the shift drum is prevented from coming into a neutral position even if the shifting speed is stopped in midstream. A lost motion spring includes gripping portions gripping a pressing portion from both sides of a coil portion surrounding the shift spindle. An arm member of shift position changing drive member is provided with a pressure-receiving member which is gripped by both gripping portions in such a manner that when the turning member is turned, if, in response to the turning direction, the pressing portion abuts against one of the gripping portions for turning, the other of the gripping portions abuts against the pressure-receiving member.

Abstract: An object of the present invention is to provide a catalyst support which can maintain the purifying ability of HC, CO and NO even after being exposed to a high temperature atmosphere such as about 1000° C. for a long term and a method which can easily produce the catalyst support. According to the present invention there is provided a method for producing a catalyst support of porous alumina formed with pores within which magneto-plumbite type complex oxide ((La.

Abstract: To provide a control method for a power transmission device which can prevent the generation of impacts and noises when a speed change mechanism is changed over from a neutral state to a first speed gear without using a brake mechanism. In a control method of a power transmission device for controlling a power transmission device for transmitting a rotational power of a crankshaft of an internal combustion engine to an output side by way of a clutch mechanism and a speed change mechanism, the speed change mechanism is automatically changed over from a neutral state to a first speed gear during a period from a point in time Ts at which an ignition switch is turned on to a point in time at which an engine rotational speed arrives at a steady-state idling rotational speed Nid due to the starting of an internal combustion engine.

Abstract: A gear shift device is provided which changes speed by transmitting rotation of a shift spindle by gear shift operation input to rotation of a shift drum through an intermittent feed mechanism and a lost motion mechanism. An upstream rotation holding mechanism is provided to hold in a required rotational position an upstream rotating member of the lost motion mechanism which is rotated by gear shift operation input through the intermittent feed mechanism. When a required level of gear shift operation is done, the gear shift device changes speed adequately, without continuing gear shift operation, and thus improves operability.

Abstract: An electronic clutch control apparatus is provided for a vehicle having a clutch assembly and a clutch lever operatively associated with the clutch assembly. The electronic clutch control apparatus includes an actuator for driving a clutch assembly, an operation amount sensor for sensing an operation amount of a clutch lever, an electronic control unit for controlling the operation of the actuator based on the detected operation amount received from the operation amount sensor, and a feedback unit for applying an operation reaction force to the clutch lever. The feedback unit includes a plurality of springs having different spring constants. The feedback unit is configured such that when the clutch lever is operated in an operation amount increasing direction thereof, the operational reactive elastic forces of the plural springs are sequentially applied to the clutch lever.

Abstract: A shift control device includes a clutch for performing a connection/disconnection of power transmitted to a drive wheel from an engine based on an operation input to a shift operator, an actuator for performing a drive control of the clutch, and a controller for controlling the driving of the actuator. The controller includes an operation quantity detector for detecting an operation quantity of a shift operator, a shift starter performing a control toward the disengagement of the clutch by driving the actuator at a stage in which an operation quantity detected by the operation quantity detector exceeds a first threshold value, and a shift starter for performing a disengagement control of the clutch by driving the actuator at a stage wherein an operation quantity detected by the operation quantity detector exceeds a second threshold value which is larger than the first threshold value.

Abstract: This gear shift device is used in a transmission of an engine, and is provided with: a shift drum that changes a speed change stage of the transmission according to a rotational position about an axis; an actuator having a driving shaft substantially orthogonal to the shift drum; a worm shaped barrel cam that is arranged parallel to the driving shaft of the actuator and that has a plurality of cam grooves on an outer circumference thereof; and a wheel gear that is coaxially fixed on the shift drum and that has a plurality of pins on an outer circumference thereof. At least a pair of each pin of the wheel gear and each cam groove of the barrel cam are engaged with each other, and the shift drum is rotated by the actuator via the barrel cam and the wheel gear, to thereby change the speed change stage of the transmission. The gear shift device is further with a detection device that detects a rotational position of the barrel cam.

Abstract: A twin-clutch device includes first and second clutch actuating mechanisms; a first clutch disconnection/connection control mechanism for exerting on the first clutch actuating mechanism a controlling force for switching disconnection/connection of the first clutch actuating mechanism; and a second clutch disconnection/connection control mechanism for exerting on the second clutch actuating mechanism a controlling force for switching disconnection/connection of the second clutch actuating mechanism. The first and second clutch disconnection/connection control mechanisms include control actuating members that are supported on a fixing member in a non-rotating state while being allowed to move in a direction along rotation axes of a first driven rotary member and second driven rotary member, the control actuating members being respectively connected to first and second clutch actuating mechanisms via bearings.

Abstract: In a clutch manipulation assist device which includes a clutch assist actuator, the actuator is arranged at a position where it is possible to suppress the influence of heat from an engine on the actuator without requiring the heat insulation structure or the like. In a clutch manipulation assist device which includes a clutch mechanism 61 which is arranged in a power transmission path for transmitting a rotational driving force of an engine to a wheel, a clutch-manipulation mechanism in which a clutch manipulation force is inputted, and an actuator which generates a clutch assist force in response to a manipulation of the clutch manipulation mechanism, the actuator is arranged in front of the engine and outside a main frame.

Abstract: A transmission for a vehicle for performing a shift manipulation at a desired time while ensuring a favorable operation feeling. A lost motion member is arranged in a shift drive force transmitting mechanism arranged between a shift spindle and a shift drum, and a rotary position of the shift drum is resiliently held by a shift stopper mechanism in a state where one of a plurality of sear trains is established or in a neutral state. A state which allows a changeover operation of an established state of a plurality of gear trains due to an action of a shift drive force which is temporarily accumulated by a lost motion means and a state which interrupts the changeover operation can be changed over by a shift restricting mechanism which is provided as a part separate from a shift stopper mechanism.

Abstract: To reduce the axial size of a twin-clutch device including first and second clutch actuating mechanisms arranged in parallel along the axes of first and second driven shafts that are coaxial. A first clutch disconnection/connection control mechanism is provided for switching disconnection/connection of the first clutch actuating mechanism. A second clutch disconnection/connection control mechanism is provided for switching disconnection/connection of the second clutch actuating mechanism. A second clutch disconnection/connection control mechanism is arranged between first and second clutch inners so that at least a part of the second clutch disconnection/connection control mechanism is accommodated in at least one of first and second cylinder portions.

Abstract: A clutch control device providing an engagement feeling which conforms to a state of a vehicle without requiring a correction of an engagement position even when a clutch is worn. A clutch control device includes a vehicle state detection part for detecting a state of a vehicle, an actuator control part for controlling the actuator, a target torque decision part for deciding a target friction torque value Tt to be generated by the clutch in response to a time which elapses from a point in time that the engagement of the clutch starts as well as in response to a state of the vehicle, and a target oil pressure decision part for deciding a target oil pressure value Pt corresponding to the target friction torque value Tt. The actuator control part controls the actuator so as to set an oil pressure value to the target oil pressure value Pt.

Abstract: In twin clutch device used in an engine transmission, there are coaxially and adjacently arranged a first disk clutch and a second disk clutch of a hydraulic pressure type that displace a pressing member in an axial direction with externally supplied hydraulic pressure to exert a predetermined engagement force, and the first disk clutch and the second disk clutch respectively have: an engagement side hydraulic chamber that gives the pressing member a pressing force towards a clutch engagement side; and a pressure compensation hydraulic chamber that gives the pressing member a pressing force toward a clutch disengagement side to compensate a pressure of a returning action thereof.

Abstract: A gear shift device is used in a transmission of an engine, and includes: a shift drum that changes a speed change stage of the transmission according to a rotational position about an axis; an actuator having a driving shaft substantially orthogonal to this shift drum; a worm shaped barrel cam that is arranged parallel to the driving shaft of this actuator and that has a cam groove on an outer circumference; and a wheel gear that is coaxially fixed on the shift drum and that has a plurality of pins on an outer circumference. At least a pair of each pin of the wheel gear and the cam groove of the barrel cam is engaged with each other, and the shift drum is rotated by the actuator via the barrel cam and the wheel gear, to thereby change the speed change stage of the transmission.

Abstract: When a predetermined time has passed without detection of engine stall and without detection of the neutral state and without detection of a vehicle starting operation, in a first control state in which a clutch is in a disengaged state, a clutch control system effects transition to a second control state in which transition to a third control state is permitted. When a vehicle starting operation is detected in the second control state B in which the clutch is in the disengaged state, a liquid pressure modulator is driven to effect transition to the third control state in which the clutch is put in the engaged state or a partially engaged state. When an engine stall or the neutral state is detected in the second control state, transition to the first control state A is effected.