In an automatic transmission (AT) in which an input shaft (Input) and an output gear (Output) are disposed on the same axis and three clutches (C 1 -C 3 ) and two brakes (B 1 , B 2 ) are selectively operated to provide six forward speeds, first and second planetary gear sets (GS 1 , GS 2 ) are configured to consistently reduce the speed of input rotation and output the speed-reduced rotation, thereby enabling downsizing of them. The first and second planetary gear sets (GS 1 , GS 2 ) are arranged in a transmission case at both the axial ends thereof. Third and fourth planetary gear sets (GS 3 , GS 4 ) are connected to each other to have four rotation elements in combination, thereby constituting a Simpson planetary gear train. One of the four rotation elements (a fourth carrier (PC 4 ) in an illustrated example) is connected to the output gear (Output). Rotations input and reduced in speed by the first and second planetary gear sets (GS 1 , GS 2 ) are input to sun gears (S 3 , S 4 ) of the third and fourth planetary gear sets (GS 3 , GS 4 ), respectively. First to third clutches (C 1 -C 3 ) and a first brake (B 1 ) are arranged to surround the first and second planetary gear sets (GS 1 , GS 2 ).

Claims

7 · 1 independent · depth 3

7 granted claims

›1.independentAn automatic transmission in which an input shaft and an output part are disposed on the same axis, first to fourth planetary gear sets each formed of…+6

›2.↳ 1The automatic transmission of claim 1, wherein the first and second planetary gear sets are single pinion planetary gear sets and the sun gears of the…d2+1

›4.↳ 1The automatic transmission of claim 1, wherein the first and second planetary gear sets have different rotational speed reduction ratios.d2

›5.↳ 1The automatic transmission of claim 1, whereinnthe first planetary gear set is a single pinion planetary gear set including a first sun gear, a first …d2+2

Classifications

4 codes

IPC · International Patent Classification

Section F — Mechanical engineering; lighting; heating; weapons

F16H3/62

USPC · US Patent Classification

475/284475/285475/276

Claim changes

Soon

Coming soonHow the claims changed between publication and grant

See which claims were amended, added or cancelled during examination, with every added and removed word marked.

AmendedAddedCancelledUnchanged

The published claims of this patent are not paired with the granted ones in what we hold.

File wrapper

⤢ drag to zoom

USPTOApplicanthover for detail · click to open

Pendency

2.4 y

887 days filing → grant

Office actions

none on record

Responses

1 RCE

Examiner

Edwin A Young

art unit —

Law firm

Law firm · Log in to unlock

Citations: 8 back · 0 forward

See the full prosecution history — every USPTO and applicant action on this file, in order.

Term & fees

See the term timeline — pendency span, in-force span, the maintenance fees paid and both computed expiry dates.

Priority chain

1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20070060439 A1	15 Mar 2007

Validity challenges

See the validity challenges on record — reexaminations, IPRs and PGRs, with their institution decisions and outcomes.

Citations

See every patent this one cites and every patent that cites it back — publication, assignee, and how each one was found.