US 2011/0011193 A1Published application

Multi-stage transmission

AssigneeHonda Motor Co., Ltd.

InventorShinya Matsumoto

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Abstract

Disclosed is a constantly-meshing-type multi-stage transmission which can be operated with small forces, does not need a clutch for gear shift, has no loss of changeover time at the time of gear shift, and in which a loss of the driving force is prevented. Driven gears n1, n2, . . . n5 are supported on a hollow driven gear shaft 12 in a manner engageable with and disengageable from a hollow driven gear shaft 12 via swing pawl members 24, 25. The transmission has first engaging means 25 for engaging the gear shaft 12 with a first driven gear n1, so as to effect synchronous rotation thereof; and second engaging means 25 for engaging the gear shaft 12 with a second gear n2, one step lower in reduction gear ratio than the first gear n1, so as to effect synchronous rotation thereof. When making an upshift by changing over the engaging means 25 from the engagement with the first gear n1 to the engagement with the second gear n2, the gear shift is made by engaging the second gear n2 with the gear shaft 12 through the second engaging means 25 while the first gear n1 is being in engagement with the gear shaft 12 through the first engaging means 25.

Claims11

Dependent claims

A multi-stage transmission wherein

a drive gear shaft and a driven gear shaft are disposed in parallel;
a plurality of drive gears and a plurality of driven gears are supported on the drive gear shaft and the driven gear shaft, respectively, in a manner that the drive gears and the driven gears are constantly meshed with each other to constitute meshing gear combinations for different speeds;
one of the drive gears and the driven gears are fixed to the gear shaft supporting the same, while the gear shaft supporting the other of the drive gears and the driven gears is a hollow gear shaft;
and
the other gears are supported on the hollow gear shaft individually in an engageable and disengageable manner through engaging means, which are operated by gear shift driving means for gear shift:
said engaging means includes:
a first engaging device for causing a first gear of the other gears and the hollow gear shaft to abut with each other in a rotational direction of the gears to thereby cause the first gear and the hollow gear shaft to be rotated synchronously;
and
a second engaging device for causing a second gear, one step lower in reduction gear ratio than the first gear, of the other gears and the hollow gear shaft to abut with each other in said rotational direction of the gears to thereby cause the second gear and the hollow gear shaft to be rotated synchronously;
wherein for making an upshift through changing over the engaging means from the engagement with the first gear to the engagement with the second gear by the gear shift driving means, the gear shift is made by engaging the second gear with the hollow gear shaft through the second engaging device in a state in which the first gear is in engagement with the hollow gear shaft through the first engaging device.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/920,627Filed 23 Feb 2009
Published: 20 Jan 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

F16H 63/30
Final output mechanisms therefor; Actuating means for the final output mechanisms: constructional features of the final output mechanisms
F16H 63/18
The final output mechanisms being successively actuated by progressive movement of the final actuating mechanism: the final actuating mechanism…
F16H 3/083
Exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts: with radially acting and axially controlled…
F16H 2063/3096
Final output elements, i.e. the final elements to establish gear ratio, e.g. coupling sleeves or other means establishing coupling to shaft:…