US 6,805,026 B2Granted

Automatic transmission

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorsYoshiaki Hori, Seiji Hamaoka

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Abstract

In an automatic transmission includes a main shaft and a counter shaft which are parallel to a crankshaft with the rotation of a torque converter on the crankshaft being transmitted to the main shaft through gears. A two-state speed change is conducted by gears provided on the main shaft and the counter shaft. An oil hydraulic clutch is operatively provided for connection and disconnection between the gear for reducing the spacing between the crankshaft and the transmission and to contrive a reduction in size of a power unit. A tubular auxiliary main shaft rotatable relative to the main shaft is provided at the outer circumference of the main shaft with a first-speed drive gear and a rearward-running drive gear are fixed on the auxiliary main shaft. First and second oil hydraulic clutches are provided for enabling contact and separation between the main shaft and the auxiliary main shaft.

Claims16

Dependent claims

An automatic transmission comprising:

a main shaft and a counter shaft being disposed parallel to a crankshaft;
a torque converter operatively provided on said crankshaft for rotation that is transmitted to said main shaft through gears with a two-stage speed change being conducted by gears provided on said main shaft and said counter shaft;
an oil hydraulic clutch is operatively provided for connection and disconnection between the gears;
a tubular auxiliary main shaft is rotatable relative to said main shaft and is provided at the outer circumference of said main shaft;
a first-speed drive gear and a rearward-running drive gear are fixed on the auxiliary main shaft;
a first oil hydraulic clutch for enabling contact and separation between said main shaft and said auxiliary main shaft is disposed on an outside of one of a pair of support portions for supporting said main shaft;
and
a second oil hydraulic clutch for enabling contact and separation between a second-speed drive gear in loose fit on said main shaft and being engaged with a second-speed driven gear fixed on said counter shaft and said main shaft is disposed on an outside of the other of said pair of support portions for supporting said main shaft.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/401,766Filed 31 Mar 2003
Priority: JP 2002-11443217 Apr 2002
Published: US 2004/0025630 A112 Feb 2004
Granted: 19 Oct 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F16H 3/091
Characterised by the disposition of the gears: including a single countershaft
F16H 3/006
Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion: power being selectively transmitted by…
F16H 47/06
Combinations of mechanical gearing with fluid clutches or fluid gearing: the fluid gearing being of the hydrokinetic type
F16H 2200/0043
Characterised by the number of forward speeds: the gear ratios comprising four forward speeds