US 4,748,869 AGranted

Automatic transmission for an automotive vehicle

AssigneeNissan Motor Co., Ltd.

InventorKunio Ohtsuka

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Abstract

A transmission for an automotive vehicle, includes an input shaft, an ouput shaft, a coupling device having an input portion thereof connected to the input shaft, and a gear mechanism for transmitting the power from the input shaft to the output shaft in such a way that three forward and one reverse drives can be obtained. The gear mechanism including first, second, third and fourth rotatable members. The fourth rotatable member is connected to the output shaft. In addition, first and second clutches are provided between the gear means and the coupling device. The first clutch is connected to the first rotatable member of the gear mechanism. The second clutch is connected to the second rotatable member of the gear mechanism. First brake selectively brakes the third rotatable member of the gear mechanism. Second brake selectively brakes the second rotatable member of the gear mechanism. Further, the transmission includes a third clutch connected to the input shaft, and a planetary gear set having fifth, sixth and seventh rotatable members. The sixth and seventh rotatable members are connected to the gear mechanism. The fifth rotatable member is connected to the third clutch.

Claims13

Dependent claims

A transmission for an automotive vehicle, comprising:

an input shaft;
an output shaft;
a coupling device having an input portion thereof connected to said input shaft;
gear means for transmitting power from said coupling device to said output shaft in such a way that three forward and one reverse drives can be obtained, said gear means including first, second, third and fourth rotatable members, said fourth rotatable member being connected to said output shaft;
first and second clutches provided between said gear means and said coupling device, said first clutch being connected to said first rotatable member of said gear means, said second clutch being connected to said second rotatable member of said gear means;
a first brake for selectively braking said third rotatable member of said gear means;
a second brake for selectively braking said second rotatable member of said gear means;
a third clutch connected to said input shaft;
and
a planetary gear set for providing an overdrive having a predetermined gear ratio as a fourth forward drive, said predetermined gear ratio being established without affecting the gear ratios of said gear means whereby said gear ratios of said gear means are established by said rotatable members of said gear means independently of said planetary gear set, said planetary gear set having fifth, sixth and seventh rotatable members, said sixth and seventh rotatable members being connected to said gear means, said fifth rotatable member being connected to said third clutch, said over-drive being obtained when said third clutch and said second brake are engaged.

7 more elements

An automatic transmission for an automotive vehicle, comprising:

an input shaft;
an output shaft;
a coupling device having an input portion thereof connected to said input shaft;
a gear train set for transmitting power from said coupling device to said output shaft in such a way that three forward and one reverse drives can be obtained, said gear train set including a first planetary gear set having first, second, third and fourth rotatable members said fourth rotatable member being connected to said output shaft;
first and second clutches provided between said gear train set and said coupling device, said first clutch being connected to said first rotatable member of said gear train set, said second clutch being connected to said second rotatable member of said gear train set;
a first brake for selectively braking said third rotatable member of said gear train set;
a second brake for selectively braking said second rotatable member of said gear train set;
a third clutch connected to said input shaft;
and
a second planetary gear set for providing an overdrive having a predetermined gear ratio as a fourth forward drive, said predetermined gear ratio being established without affecting the gear ratios of said gear train set, whereby said gear ratios at said gear train set are established by said rotatable members of said gear train set independently of said second planetary gear set, said second planetary gear set having fifth, sixth and seventh rotatable members, said sixth and seventh rotatable members being connected to said first planetary gear set, said fifth rotatable member being connected to said third clutch so that the power from the input shaft can be transmitted to the fifth rotatable member of said second planetary gear set bypassing said coupling device, in such a way that the over-drive can be obtained when said second brake and said third clutch are engaged while the other clutches and brake are disengaged.

7 more elements

An automatic transmission for an automotive vehicle, comprising an input shaft, an output shaft, a coupling device connected to said input shaft, a conventional three-speed gear train set with three forward speeds and one reverse drive, said three speed gear train being connected to said coupling device and including a first clutch, a second clutch, a first planetary gear set, a first brake, and a second brake, said first planetary set having first, second, third and fourth rotatable members, said first rotatable member being connected by way of said first clutch to said coupling device, said second rotatable member being connected by way of said second clutch to said coupling device and selectively braked by said second brake, said third rotatable member being selectively braked by said first brake;

said fourth rotatable member being directly connected to said output shaft;
a second planetary gear set having fifth, sixth and seventh rotatable members for providing an overdrive having a predetermined gear ratio as a fourth forward drive said predetermined gear ratio being established without affecting the gear ratios of said conventional three speed gear train set, whereby said gear ratios of said gear train set are established by said rotatable members of said gear train set independently of said second planetary gear set;
a third clutch placed between said second planetary gear set and said input shaft;
said fifth rotatable member being connected by way of said third clutch to said input shaft;
said sixth and seventh rotatable members being connected to two rotatable members among said first, second, third and fourth rotatable members;
a first forward speed being obtained by engaging said first clutch and said first brake;
a second forward speed being obtained by engaging said first clutch and said second brake;
a third forward speed being obtained by engaging said first and third clutches;
said overdrive being obtained by engaging said third clutch and said second brake;
and
a reverse drive being obtained by engaging said second clutch and said first brake.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/864,572Filed 19 May 1986 · continuation
Priority: JP 54-10283114 Aug 1979
Granted: 7 Jun 1988
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F16H 3/666
Composed of a number of gear trains without drive passing from one train to another: with intermeshing orbital gears
F16H 3/663
Composed of a number of gear trains without drive passing from one train to another: with conveying rotary motion between axially spaced orbital…
F16H 47/085
The mechanical gearing being of the type with members having orbital motion: with at least two mechanical connections between the hydrokinetic…
F16H 2200/0039
Characterised by the number of forward speeds: the gear ratios comprising three forward speeds