2-wheel/4-wheel drive switching apparatus

Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements

Patent

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Details

74422, 74 8917, B60K 2002

Patent

active

051671646

ABSTRACT:
The rotational speed of a motor is reduced by a worm gear and a worm wheel and the reduced rotation is transferred to a first pinion gear. A first moving plate is moved along a pair of shafts. A second moving plate is provided for the first moving plate by inserting to the same pair of shafts. A first coil spring is interposed between a retaining portion of a shaft inserting hole of the first moving plate of one of the shafts and a retaining portion of a shaft inserting hole of the second moving plate. The first coil spring is compressed by the movement of the first moving plate upon switching to the 4-wheel drive, thereby accumulating the force. A second coil spring is interposed between a retaining portion of the shaft inserting hole of the first moving plate of the other shaft and a retaining portion of the shaft inserting hole of the second moving plate. The second coil spring is compressed by the movement of the first moving plate upon switching to the 2-wheel drive, thereby accumulating the force. When the switching enable state of a coupling sleeve from the 4-wheel drive to the 2-wheel drive is satisfied, a second pinion gear is rotated by a rack gear of the plate by the movement of the second moving plate due to the force accumulated in the spring. A shift rod is shifted through a planetary gear mechanism by the engagement with the rack gear of the third pinion gear.

REFERENCES:
patent: 842416 (1907-01-01), Nelson
patent: 1673952 (1928-06-01), Schmidt
patent: 2859628 (1958-11-01), Arko
patent: 4449416 (1984-05-01), Huitema
patent: 4520994 (1985-06-01), DeWald
patent: 4805472 (1989-02-01), Aoki et al.
patent: 4987791 (1991-01-01), Nakahashi et al.
patent: 5015149 (1991-05-01), Weiss

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