Two and four-wheel drive transfer device

Motor vehicles – Having four wheels driven – With manually operated means for disengaging drive to one or...

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Details

74 34, 74339, 192 82P, 464160, B60K 1734

Patent

active

048629898

ABSTRACT:
A two-wheel and four-wheel drive transfer device includes a reciprocating fork shaft having a shift fork engagable with a sliding dog clutch so as to reciprocate the dog clutch and provide either two-wheel and four-wheel drive operating conditions. A motor is provided so as to rotate a worm gear assembly which is relatively rotatable with an output shaft supported in a casing. This worm gear is connected to and rotates a plate concurrently with rotation of the worm gear. A spring support plate is provided to be secured to the output shaft and two spiral springs, each spring being wound in a different direction and having a different rotating torque, are fixed to the output shaft and have ends brought into contact with the rotating plate and the spring support plate so that the rotating torque of the worm wheel is transmitted to the output shaft through the spiral springs depending on the direction of rotation of the worm gear.

REFERENCES:
patent: 4290318 (1981-09-01), Ookuba et al.
patent: 4805472 (1989-02-01), Aoki et al.

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