Automatic transmission gear and clutch arrangement

Patent metadata

Field	Value
Publication number	US-9618087-B2
Application number	US-201313916150-A
Country	US
Kind code	B2
Filing date	Jun 12, 2013
Priority date	Jun 14, 2012
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

A transmission is provided having an input member, an output member, four planetary gear sets, a four coupling members and a six torque-transmitting mechanisms. Further, a hydraulic fluid control circuit is provided for controlling the operation of the plurality of torque-transmitting devices. The hydraulic fluid control circuit receives pressurized hydraulic fluid from an off-axis hydraulic fluid pump and has a plurality of fluid passages disposed in the transmission house, input member and other coupling members.

First claim

What is claimed is:

1. A multi-speed transmission comprising:
a transmission housing having a front portion, a center portion, and a rear portion;
a first, a second, a third, and a fourth planetary gear set each having a first, a second, and a third member;
an input member including an outer surface and a first, a second, a third, and a fourth bore, and wherein the input member is rotatably supported by the transmission housing, the input member is continuously interconnected with the second member of the second planetary gear set, the first, second, third and fourth bores are disposed parallel to a longitudinal axis of the input member, the first, third, and fourth bores are apply bores, and the second bore is a dam bore;
an output member rotatably supported by the transmission housing, the output member continuously interconnected to the second member of the fourth planetary gear set;
four interconnecting members each continuously interconnecting one of the first, second, and third members of one of the planetary gear sets with another of the first, second, and third members of another one of the planetary gear sets;
an intermediate member rotatably supported by one of the four interconnecting members;
a first and a second torque transmitting mechanism, each selectively interconnecting at least one of the first, second, and third members of one of the first, second, third, and fourth planetary gear sets with the transmission housing;
a third torque transmitting mechanism selectively interconnecting at least one of the first, second, and third members of one of the first, second, third, and fourth planetary gear sets with another one of the first, second, and third members of one of the first, second, third, and fourth planetary gear sets;
a fourth, a fifth, and a sixth torque transmitting mechanism, each selectively interconnecting at least one of the first, second, and third members of one of the first, second, third, and fourth planetary gear sets with the intermediate member; and
wherein the torque transmitting mechanisms are selectively engageable in combinations of no more than three to establish ten forward speed ratios and at least one reverse speed ratio between the input member and the output member, each of the torque transmitting mechanisms include a clutch pack and an actuating assembly, the actuating assembly of the first torque transmitting mechanism is supported by the center portion of the transmission housing, and the actuating assembly of the second torque transmitting mechanism is supported by the rear portion of the transmission housing, and the intermediate member rotates freely with respect to the first, second, and third members of each of the first, second, third, and fourth planetary gear sets when each of the fourth, fifth, and sixth torque transmitting mechanisms are disengaged.

2. The multi-speed transmission of claim 1 wherein a first of the four interconnecting members continuously interconnects the first member of the first planetary gear set with the first member of the second planetary gear set, a second of the four interconnecting members continuously interconnects the second member of the first planetary gear set with the third member of the fourth planetary gear set, a third of the four interconnecting members continuously interconnects the third member of the second planetary gear set with the first member of the third planetary gear set, and a fourth of the four interconnecting members continuously interconnects the third member of the third planetary gear set with the first member of the fourth planetary gear set.

3. The multi-speed transmission of claim 2 wherein the actuating assembly of the first torque transmitting mechanism includes a piston, an apply chamber, and a dam spring, the actuating assembly of the second torque transmitting mechanism includes a piston, a first apply chamber, a second apply chamber, and a dam chamber, the actuating assemblies of the third, fourth, fifth, and sixth torque transmitting mechanisms each include a piston, an apply chamber, and a dam chamber.

4. The multi-speed transmission of claim 3 wherein the center portion of the transmission housing includes an apply passage, the apply passage of the center portion is in communication with the apply chamber of the first of the six torque transmitting mechanisms, the rear portion of the transmission housing includes a first apply passage, a second apply passage, and a dam passage, the first apply passage of the rear portion of the transmission housing is in communication with the first apply chamber of the second torque transmitting mechanism, the second apply passage of the rear portion of the transmission housing is in communication with the second apply chamber of the second torque transmitting mechanism, and the dam passage of the rear portion of the transmission housing is in communication with the dam chamber of the second torque transmitting mechanism.

5. The multi-speed transmission of claim 3 wherein the front portion of the transmission housing includes a first, second, third, and fourth apply passage and a dam passage, the fourth apply passage is in communication with the apply chamber of the third torque transmitting mechanism, and the dam passage is in communication with the dam chamber of the third torque transmitting mechanism.

6. The multi-speed transmission of claim 5 wherein the input member includes a first, second, and third apply passage and a dam passage, the first apply passage of the input member is in communication with each of the first apply passage of the front portion of the transmission housing and the apply chamber of the fourth torque transmitting mechanism, the second apply passage of the input member is in communication with each of the second apply passage of the front portion of the transmission housing and the apply chamber of the fifth torque transmitting mechanism, the third apply passage of the input member is in communication with each of the third apply passage of the front portion of the transmission housing and the apply chamber of the sixth torque transmitting mechanism, and the dam passage of the input member is in communication with each of the dam passage of the front portion of the transmission housing and the dam chambers of each of the fourth, fifth, and sixth torque transmitting mechanism.

7. The multi-speed transmission of claim 5 wherein the input member includes a first, a second, and a third clutch port, the first clutch port is in communication with the apply chamber of the fourth torque transmitting mechanism and the first bore of the input member, the second clutch port is in communication with the apply chamber of the fifth torque-transmitting mechanism and the second bore of the input member, the third clutch port is in communication with the apply chamber of the sixth torque-transmitting mechanism and the third bore of the input member, and a first, second, and third dam ports in communication with the dam chambers of the fourth, fifth, and sixth of the six torque transmitting mechanisms, respectively, and the fourth bore of the input member.

8. The multi-speed transmission of claim 7 further including:
a sleeve shaft supported by the front portion of the transmission housing, and wherein the sleeve shaft has an inner surface;
a plurality of input member seals; and
a first annular channel, a second annular channel, a third annular channel, and a fourth annular channel wherein the annular channels are defined by the inner surface of the sleeve shaft, the outer surface of the input member, and the plurality of input member seals, and
wherein the first annular channel communicates with the first bore of the input member through a first port, the second annular channel communicat

Assignees

• Gm Global Tech Operations Llc

Inventors

• Mellet Edward W
• Hart James M
• Wilton Daryl A
• Neelakantan Vijay A

Classifications

• F16H3/66 Primary

  composed of a number of gear trains without drive passing from one train to another · CPC title

• F16H2200/0069

  the gear ratios comprising ten forward speeds · CPC title

• F16H2200/2046

  with six engaging means · CPC title

• F16H3/62 Primary

  Gearings having three or more central gears (F16H3/68 - F16H3/78 take precedence) · CPC title

• F16H2200/2012

  with four sets of orbital gears · CPC title