Importance

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Abstract

A transmission apparatus includes a straight input shaft, a first group of large and small gears rigidly mounted on the input shaft and adapted to turn with the shaft, a straight transmission shaft installed near and parallel to the input shaft; a second group of large and small gears rotatably mounted on the transmission shaft, the sizes of the gears being in opposite relationship with those of the gears in the first group on the input shaft, a third gear rigidly mounted on the transmission shaft, a back gear rotatably mounted on the transmission shaft, partition rings installed between each of the gears in the second group, the third gear, and the back gear with no gap between the partition rings and the gears, and engagement grooves in the second group formed in the internal surface of the gears the third gear and the back gear. The engagement grooves are separated from each other by the partition rings. An axially extending speed change groove is formed in the surface of the transmission shaft and an axially movable speed change claw is installed in the speed change groove. When the speed change claw, engages with the engagement groove formed in the internal surface of the gears in the first group of gears and the back gear, the transmission shaft is driven and, when it engages with the engagement groove formed in the internal surface of the third gear, i.e. in the neutral position, the transmission shaft is not driven.

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First Claim