摘要:
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.
摘要:
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). An interference of a portion of the cylindrical portion (23aa) and/or (22a) of the core member (23a) and/or the slinger (22) near the upstanding portion (23ab) and/or (22b) is formed smaller than that of the other portion of the cylindrical portion (23aa) and/or (22a) of the core member (23a) and/or the slinger (22).
摘要:
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.
摘要:
A rotation transmission device is mounted in a drive train of a four-wheel drive vehicle to selectively distribute driving force to selected vehicle wheels according to the travel condition of the vehicle. This device includes an outer ring and an input shaft. A cylindrical face is formed on one of the opposed surfaces of the outer ring and the input shaft, while cam faces are formed on the other opposed surface to define a wedge-shaped space between the cylindrical face and each cam face. Rollers are mounted in pockets formed in a retainer mounted between the input shaft and the outer ring. An electromagnetic clutch is coupled to the retainer. A switch spring is mounted between the retainer and the input shaft. A two-way clutch is provided between the outer ring and the input shaft. A control unit controls the two-way clutch by adjusting the amount of current fed through a coil of the electromagnetic clutch according to the travel condition of the vehicle, thus selectively distributing driving force to selected vehicle wheels. A method of controlling the rotation transmission device is also proposed. Also, another transmission device is proposed which is mounted in the transfer of a vehicle.
摘要:
A mechanical device to be mounted on a four-wheel drive vehicle capable of transmitting driving force to the rear wheels while the vehicle is being accelerated and cutting off the transmission of driving force to the rear wheels while being braked. This device has an inner member to be coupled in series with a differential or a limited slip differential device, and an outer ring. On the opposite surfaces of the inner member and the outer ring are formed a cylindrical surface and a plurality of cam surfaces, between which are defined wedge-shaped spaces. A retainer is provided between the inner member and the outer ring. It is formed with pockets to receive rollers as engaging elements. A turning effort imparting device is coupled to the retainer through a one-way clutch. A torsion coil spring for producing turning effort is mounted between the retainer and the inner member. When the one-way clutch is switched on or off, the direction of turning effort applied to the retainer changes, so that the direction in which the rotation of the retainer delays with respect to the inner member is reversed. The rollers are thus kept in one of the two opposite engageable positions when the inner member is rotating in either direction.
摘要:
High quality bisphenol A is produced from a neutral crystalline adduct of bisphenol A and phenol by fusing the adduct in an atmosphere having a maximum oxygen content of 0.005% by volume, followed by evaporation of liberated phenol. The crystalline adduct may be mixed with an aliphatic carboxylic acid before the fusion to reduce the coloring of the product. When an acidic crystalline adduct is used, the use of a strong alkali salt of an aliphatic carboxylic acid is suitably used. Interior surfaces of the apparatuses for carrying out the fusion and evaporation are desirably washed with an organic solvent to remove oxygen therefrom. The evaporation of phenol is suitably performed by two stage steam stripping wherein a used stripping gas obtained in the second stage is employed as a stripping gas in the first stage while steam is used as the stripping gas in the second stage.