Mazda Motor Corporation

Kenji Sakamoto

Osamu Kameda

Hideo Toyota

Kazuhiko Moriyama

Hiroaki Nagamatsu

Etsuo Shirai

A manual power transmission includes a transmission casing, input and output shafts coaxially aligned with each other and a countershaft accommodated within the transmission casing and positioned below the input and output shafts. The input and output shaft has a plurality of gears of a varying size or diameter mounted thereon and associated with gearshifting positions and the countershaft has a corresponding number of coutergears of a varying size or diameter mounted thereon and paired with the gears on the input and output shafts. Some of the countergears which serve as an idle gear are so juxtaposed in a direction axially of the countershaft that an envelope enclosing all of the those countergears while touching respective outer perimeters of those remaining countergears represents a generally barrel shape having a generally intermediate portion thereof bulged radially outwardly with respect to the countershaft.

Gear type power transmission

A gear type transmission apparatus comprises a transmission case containing a plurality of gear trains and an output shaft to which an output of an engine is transmitted through the gear trains and provided with an opening at an upper portion thereof, a cover member mounted on the upper portion of the transmission case to cover the opening, a holder member formed separately from the cover member and fixed on an under surface of the cover member to be positioned at the inside of a contacting face of the cover member provided for coming into contact with an upper end face of the transmission case, and a shift rod supported by the holder member to be movable in a direction along its axis at a position above the output shaft for causing the gear trains to be in operation to transmit the output of the engine selectively.

Growing community of inventors

Hiroshima, Japan

Kenji Sakamoto