Abstract: A lash adjuster is provided in which the friction coefficient between the pressure flanks is less likely to decrease over a long time use. The lash adjuster 1 includes a nut member 10 having an internal thread 17 on its inner periphery, an adjusting screw 11 having an external thread 18 on its outer periphery which is in threaded engagement with the internal thread 17, and a return spring 12 biasing the adjusting screw 11 in a direction to protrude from the nut member 10, the external thread 18 and the internal thread 17 having pressure flanks 19 and 21, respectively, for receiving an axial load that tends to push the adjusting screw 11 into the nut member 10, wherein a satin finished surface is formed on the pressure flank 19 of the external thread 18, and the satin finished surface has a higher surface hardness than the pressure flank 21 of the internal thread 17.

Abstract: The object is to prevent the adjusting screw from being pushed in while rotating when a load is applied to the adjusting screw that tends to push in the adjusting screw. In a lash adjuster comprising a cylindrical housing 12 inserted in a receiving hole 11 formed in the top surface of a cylinder head 2 and having an internal thread 13 on the inner periphery thereof, an adjusting screw 15 having an external thread 14 on the outer periphery thereof and in threaded engagement with the internal thread 13 on the housing 12, and a return spring 17 biasing the adjusting screw 15 in a direction to protrude upwardly from the housing 12, the adjusting screw 15 having a protruding end 19 protruding from the housing 12 and supporting an arm 7, the surface of the protruding end 19 of the adjusting screw 15 is made of a material that does not react with oil additives of oil containing organic molybdenum.

Abstract: A rotation transmission device includes inner and outer rings, a two-way clutch mounted between the outer and inner rings, and an electromagnetic clutch mounted adjacent to the two-way clutch. The electromagnetic clutch includes a rotor guide pressed onto the outer ring at its open end and a rotor pressed into the rotor guide. The rotor guide is made of a magnetic material having the same or substantially the same coefficient of linear expansion as the material of the rotor. Thus, even when the rotor guide and the rotor are heated and expanded, the interference between the rotor and the rotor guide remains substantially constant. Therefore, the rotor and the rotor guide can be reliably coupled together with a simple structure and at a low cost.

Abstract: A one-way clutch is proposed which is low in surface pressures and durable. It includes an inner ring having a cylindrical outer surface, and an outer ring having a cylindrical inner surface defining a wedge-shaped space in cooperation with the cylindrical outer surface of the inner ring. A ring-shaped wedge member is disposed in the wedge-shaped space. The wedge member is formed with a cylindrical outer surface and a cylindrical inner surface having a center of curvature that is radially offset from the center of curvature of the cylindrical outer surface of the wedge member. A resilient member is provided between the inner ring and the wedge member to bias the wedge member in a direction to be wedged into the narrow portion of the wedge-shaped space. When the inner ring is rotated in one direction, the wedge member will be brought into wedging engagement with the cylindrical surfaces of the inner and outer rings. Torque is thus transferred from the inner ring to the outer ring.

Abstract: A rotation transmission device includes inner and outer rings, a two-way clutch mounted between the outer and inner rings, and an electromagnetic clutch mounted adjacent to the two-way clutch. The electromagnetic clutch includes a rotor guide pressed onto the outer ring at its open end and a rotor pressed into the rotor guide. The rotor guide is made of a magnetic material having the same or substantially the same coefficient of linear expansion as the material of the rotor. Thus, even when the rotor guide and the rotor are heated and expanded, the interference between the rotor and the rotor guide remains substantially constant. Therefore, the rotor and the rotor guide can be reliably coupled together with a simple structure and at a low cost.

Abstract: The magnetic attraction force of an electromagnetic coil in an electromagnetic clutch is increased in a limited installation space, thereby improving reliability of operation. The dimensions of a field core housing the electromagnetic coil and a rotor are optimized to increase the magnetic attraction force. The thicknesses of cylindrical portions on the inner-diameter side of the field core and the rotor have larger thicknesses than those of cylindrical portions on its outer-diameter side so that the sectional areas of both cylindrical portions will be equal to each other. Also, a rotation transmission device provided with an electromagnetic clutch is proposed which can avoid deterioration of its sealing property and damage to its bearing and avoid cost increase.

Abstract: A one-way clutch is proposed which is low in surface pressures and durable. It includes an inner ring having a cylindrical outer surface, and an outer ring having a cylindrical inner surface defining a wedge-shaped space in cooperation with the cylindrical outer surface of the inner ring. A ring-shaped wedge member is disposed in the wedge-shaped space. The wedge member is formed with a cylindrical outer surface and a cylindrical inner surface having a center of curvature that is radially offset from the center of curvature of the cylindrical outer surface of the wedge member. A resilient member is provided between the inner ring and the wedge member to bias the wedge member in a direction to be wedged into the narrow portion of the wedge-shaped space. When the inner ring is rotated in one direction, the wedge member will be brought into wedging engagement with the cylindrical surfaces of the inner and outer rings. Torque is thus transferred from the inner ring to the outer ring.

Abstract: A sealing apparatus (20) has a slinger (22) with a substantially L-shaped cross-section including a cylindrical portion (22a) to be fitted on a member of rotational side and an upstanding portion (22b) radially extending from one end of the cylindrical portion (22a). The apparatus also has a core member (23a) of a substantially L-shaped cross-section including a cylindrical portion (23aa) to be fitted in a member of stationary side and an upstanding portion (23ab) radially extending from one end of the cylindrical portion. Further included is a sealing element (23b) including one ore more side lips (23ba) and (23ba) adapted to be slidably contacted with the upstanding portion (22b) of the slinger (22) and one or more radial lips (23bb) adapted to be slidably contacted with the cylindrical portion (22a) of the slinger (22).

Abstract: The magnetic attraction force of an electromagnetic coil in an electromagnetic clutch is increased in a limited installation space, thereby improving reliability of operation. The dimensions of a field core housing the electromagnetic coil and a rotor are optimized to increase the magnetic attraction force. The thicknesses of cylindrical portions on the inner-diameter side of the field core and the rotor have larger thicknesses than those of cylindrical portions on its outer-diameter side so that the sectional areas of both cylindrical portions will be equal to each other. Also, a rotation transmission device provided with an electromagnetic clutch is proposed which can avoid deterioration of its sealing property and damage to its bearing and avoid cost increase.

Abstract: The magnetic attraction force of an electromagnetic coil in an electromagnetic clutch is increased in a limited installation space, thereby improving reliability of operation. The dimensions of a field core housing the electromagnetic coil and a rotor are optimized to increase the magnetic attraction force. The thicknesses of cylindrical portions on the inner-diameter side of the field core and the rotor have larger thicknesses than those of cylindrical portions on its outer-diameter side so that the sectional areas of both cylindrical portions will be equal to each other. Also, a rotation transmission device provided with an electromagnetic clutch is proposed which can avoid deterioration of its sealing property and damage to its bearing and avoid cost increase.

Abstract: A rotation transmission device is provided which is used to selectively transmit power. The aim is to stabilize the frictional torque when the rotor of an electromagnet absorbs an armature. A retainer is mounted between an inner member and an outer member, and is formed with a plurality of pockets, and engaging elements are mounted in the pockets. An armature is mounted so as to be nonrotatable but axially movable relative to the retainer, and a rotor is mounted to the inner member or the outer member so as to axially oppose the armature. An electromagnet attracts the armature to the rotor, thereby changing the phase of the retainer to bring the engaging elements into engagement with the outer periphery of the inner member and the inner periphery of the outer member, and thereby transmitting a turning torque between the inner member and the outer member. When the armature is attracted to the rotor, the large-diameter portion of the armature is attracted to the rotor.

Abstract: A sealing apparatus (20) has a slinger (22) with a substantially L-shaped cross-section including a cylindrical portion (22a) to be fitted on a member of rotational side and an upstanding portion (22b) radially extending from one end of the cylindrical portion (22a). The apparatus also has a core member (23a) of a substantially L-shaped cross-section including a cylindrical portion (23aa) to be fitted in a member of stationary side and an upstanding portion (23ab) radially extending from one end of the cylindrical portion. Further included is a sealing element (23b) including one ore more side lips (23ba) and (23ba) adapted to be slidably contacted with the upstanding portion (22b) of the slinger (22) and one or more radial lips (23bb) adapted to be slidably contacted with the cylindrical portion (22a) of the slinger (22).

Abstract: This invention pertains to a power transmission device suited for use in a hybrid car for selective transmission of its engine and motor powers. The power transmission device is used to transmit and cut off driving forces from an internal combustion engine or a motor of a hybrid car, and includes a two-way clutch having engaging elements, and a control mechanism for controlling the locking and freeing of the two-way clutch. The control mechanism includes an electromagnetic clutch having an electromagnet and an armature. By mounting such power transmission devices on the outputs of the engine and the motor, it is possible to easily transmit and cut off driving force by simply turning on and off the electromagnet.

Abstract: A rotation transmission device is provided which is used to selectively transmit a power. The aim is to stabilize the frictional torque when the rotor of an electromagnet absorbs an armature. A retainer is mounted between the inner member and the outer member and formed with a plurality of pockets and engaging elements are mounted in the pockets. An armature is mounted so as to be nonrotatable but axially movable relative to the retainer and a rotor is mounted to the inner member or the outer member so as to axially oppose to the armature. An electromagnet attracts the armature to the rotor, thereby changing the phase of the retainer to bring the engaging elements into engagement with the outer periphery of the inner member and the inner periphery of the outer member, and transmitting a turning torque between the inner member and the outer member. When the armature is attracted to the rotor, the large-diameter portion of the armature is attracted to the rotor.

Abstract: The magnetic attraction force of an electromagnetic coil in an electromagnetic clutch is increased in a limited installation space, thereby improving reliability of operation. The dimensions of a field core housing the electromagnetic coil is coil and a rotor are optimized to increase the magnetic attraction force. The thicknesses of cylindrical portions on the inner-diameter side of the field core and the rotor have larger thicknesses than that of cylindrical portions on its outer-diameter side so that the sectional areas of both cylindrical portions will be equal to each other. Also, a rotation transmission device provided with an electromagnetic clutch is proposed which can prevent deterioration of sealing property and damage to the bearing and avoid cost increase.

Abstract: A power transmission device suited for use in a hybrid car for selective transmission of its engine and motor powers. The power transmission device is used to transmit and cut off driving forces from an internal combustion engine or a motor of a hybrid car, and includes a two-way clutch having engaging elements, and a control means for controlling the locking and freeing of the two-way clutch. The control means includes an electromagnetic clutch having an electromagnet and an armature. By mounting such power transmission devices on the outputs of the engine and the motor, it is possible to easily transmit and cut off driving force by simply turning on and off the electromagnet.

Abstract: A power cut/connect device is proposed which is axially compact and is usable in a limited space. The device includes a first input member coupled to a power shaft, an output member mounted coaxially with the first input member, a first two-way clutch provided between the first input member and the output member, a second input member coaxially mounted with the output member, a second two-way clutch provided between the output member and the second input member so as to be disposed coaxially with and around the first two-way clutch, and a control unit for controlling the first and second two-way clutches for interruption and connection of power.

Abstract: This invention pertains to a power transmission device suited for use in a hybrid car for selective transmission of its engine and motor powers. The power transmission device is used to transmit and cut off driving forces from an internal combustion engine or a motor of a hybrid car, and includes a two-way clutch having engaging elements, and a control mechanism for controlling the locking and freeing of the two-way clutch. The control mechanism includes an electromagnetic clutch having an electromagnet and an armature. By mounting such power transmission devices on the outputs of the engine and the motor, it is possible to easily transmit and cut off driving force by simply turning on and off the electromagnet.

Abstract: A four-wheel drive system according to the invention can shorten a delay in response of an electromagnetic clutch and permits shockless transition to 4WD. In a rotation transmission device having a two-way clutch including rollers mounted between an inner member and an outer ring for selective transmission and non-transmission of rotation between the inner member and the outer ring, an electromagnetic clutch for controlling the locking and freeing of the two-way clutch, and a current control mechanism for controlling the locking and freeing of the two-way clutch, a current supplied to the current control mechanism is controlled based on an input signal from a sensor for detecting the load on the engine to shorten a delay in response until the two-way clutch locks after the supply of a current to the electromagnetic coil has begun and to prevent shocks during transition to 4WD.

Abstract: A rotation transmission device including a clutch having an inner member, an outer ring, and engaging elements provided between the inner member and the outer ring for selective transmission and shutoff of rotation power between the inner member and the outer ring, and an electromagnetic clutch having an electromagnetic coil for locking and disengaging the clutch. When the clutch is not engaged, a current of a lower level than required to lock the clutch is supplied to the electromagnetic coil of the electromagnetic clutch to shorten the response time. In another method, when DIRECT-CONNECT 4WD mode is selected, a current is intermittently supplied to an electromagnetic coil to reduce power consumption and heat buildup.