Gear structure of transmission
View Patent ↗A transmission includes: a counter low-gear with a low-gear body and a boss fit into the low-gear body so that driving force can be transmitted, and provided with dog-claws and an expanded part at one axial end and that is axially non-movably and rotatably fit around a counter shaft. A counter high-gear with a high-gear body is arranged in the one side from the low-gear body and with a cylinder including dog-claws at the one axial end thereof and is axially non-movably and rotatably fit around the boss. A shift sleeve is axially movably spline-fit around the counter shaft, and is arranged in the one side from the counter high-gear and that includes dog-claws capable of engaging with the dog-claws of the gears. The high-gear body is axially non-movably arranged between the low-gear body and the expanded part.
1. A gear structure of a transmission, comprising:
a first gear including:
a first gear body including first gear teeth formed on an outer periphery thereof, and
a boss part fit into an inner diameter part of the first gear body so that a driving force can be transmitted therebetween, and the boss part having integral first dog claws and an integral expanded diameter part at a first end thereof extending in a first axial direction such that the boss part has a one-piece construction, and the boss part being axially non-movably and rotatably fit onto an outer periphery of a transmission shaft;
a second gear including:
a second gear body arranged in the first direction of the first gear body and including second gear teeth formed on an outer periphery thereof, and
a cylindrical part including integral second dog claws at an end part extending in the first axial direction from the second gear body, and the second gear being axially non-movably and rotatably fit onto an outer periphery of the boss part; and
a shift sleeve axially movably spline-fit onto the transmission shaft and arranged in the first direction relative to the second gear, the shift sleeve including sleeve-side dog claws capable of engaging with the first dog claws and the second dog claws,
wherein the second gear body is axially non-movably arranged between the first gear body and the expanded diameter part.
2. The gear structure of a transmission according to claim 1 , wherein
a second end of the first gear body and a second end of the boss part of the first gear are located approximately at the same position in the axial direction.
3. The gear structure of a transmission according to claim 1 , wherein
the first gear body is spline-fit onto the outer periphery of the boss part.
4. The gear structure of a transmission according to claim 1 , wherein
a bearing for rotatably supporting a second end of the transmission shaft in a case member is arranged on a second side relative to the first gear, and an inner diameter of the bearing is smaller than an inner diameter of the boss part.
5. The gear structure of a transmission according to claim 4 , wherein
the first gear is a low gear for low-speed forward movement and the second gear is a high gear for high-speed forward movement.