Transmission for internal combustion engine
AssigneeHonda Motor Co., Ltd.
InventorsMasataka Tanaka, Masahiko Tsuchiya, Yasuhiro Higashi
Life of this patent
Estimating the term…
Abstract
A transmission for an internal combustion engine that allows a fit length between a dog and a dog hole to be made longer and gear splines to be made longer, without having to increase an axial length of the transmission. A transmission selectively performs gearshifting by using a shift fork to slidingly move a shift gear of the transmission axially and by using a dog clutch to engage the shift gear with, or disengage the shift gear from, an adjacent gear. When the shift gear slidingly moves, a gear-side spline portion of the shift gear slidingly moves over a shaft-side spline portion.
Claims18
A transmission for an internal combustion engine, comprising:
- a main shaft;
- a countershaft disposed in parallel with the main shaft;
- and
- a shifting gear group disposed between the main shaft and the countershaft, the shifting gear group including:
- shift gears fitted axially slidably into shaft-side spline portions formed in at least either the main shaft or the countershaft;
- the transmission selectively performing gear shifting by using shift forks to slidingly move the shift gears axially and by using dog clutches to engage the shift gears with, or disengage the shift gears from, adjacent gears;
- wherein when the shift gear slidingly moves, a gear-side spline portion of the shift gear slidingly moves over the shaft-side spline portion,
- wherein on at least either the main shaft or the countershaft, a splined portion of the shift gear, in which the gear-side spline portion is formed, has an axially protruding protrusion formed on an end portion of the splined portion on a side spaced apart from a sixth dog clutch;
- and
- the protrusion protrudes from a shaft end portion in which the shaft-side spline portion is disposed.
A transmission for an internal combustion engine, comprising:
- a main shaft;
- a countershaft disposed in parallel with the main shaft;
- and
- a shifting gear group disposed between the main shaft and the countershaft, the shifting gear group including:
- shift gears fitted axially slidably into shaft-side spline portions formed in the countershaft;
- the transmission selectively performing gear shifting by using shift forks to slidingly move the shift gears axially and by using dog clutches to engage the shift gears with, or disengage the shift gears from, adjacent gears;
- wherein when the shift gear slidingly moves, a gear-side spline portion of the shift gear slidingly moves over the shaft-side spline portion, wherein on the countershaft, a splined portion of the shift gear, in which the gear-side spline portion is formed, has an axially protruding protrusion formed on an end portion of the splined portion on a side spaced apart from a sixth dog clutch;
- and
- the protrusion protrudes from a shaft end portion in which the shaft-side spline portion is disposed.
A transmission for an internal combustion engine, comprising:
- a main shaft;
- a countershaft disposed in parallel with the main shaft;
- a shifting gear group disposed between the main shaft and the countershaft, said shifting gear group including shift gears fitted axially slidably into shaft-side spline portions formed in at least either the main shaft or the countershaft;
- shift forks operatively connected to the shift gears for moving the shift gears axially wherein the transmission selectively performs a gear shifting;
- dog clutches for engaging the shift gears with, or disengaging the shift gears from, adjacent gears;
- and
- a gear-side spline portion of the shift gear slidingly movable over the shaft-side spline portion when the shift gear is slidingly moved by the shift forks
- wherein on at least either the main shaft or the countershaft, a splined portion of the shift gear, in which the gear-side spline portion is formed, has an axially protruding protrusion formed on an end portion of the splined portion on a side spaced apart from a sixth dog clutch;
- and
- the protrusion protrudes from a shaft end portion in which the shaft-side spline portion is disposed.
Dependencies are inferred from the claim text.