Multi-speed planetary transmission

Patent metadata

Field	Value
Publication number	US-11859698-B2
Application number	US-202117802198-A
Country	US
Kind code	B2
Filing date	Feb 18, 2021
Priority date	Feb 25, 2020
Publication date	Jan 2, 2024
Grant date	Jan 2, 2024

Abstract

A multi-speed transmission including a plurality of planetary gearsets and a plurality of selective couplers to achieve at least nine forward speed ratios and at least nine reverse speed ratios is disclosed. The plurality of planetary gearsets may include a first planetary gearset, a second planetary gearset, a third planetary gearset, a fourth planetary gearset, and a fifth planetary gearset. The plurality of selective couplers may include a number of clutches and a number of brakes. The multi-speed transmission may have five planetary gearsets and eight selective couplers. The eight selective couplers may include three clutches and five brakes.

First claim

What is claimed is:

1. A transmission comprising:
at least one stationary member;
an input member rotatable relative to the at least one stationary member;
a plurality of planetary gearsets operatively coupled to the input member, each of the plurality of planetary gearsets including a first gearset component, a second gearset component, and a third gearset component, the plurality of planetary gearsets including a first planetary gearset, a second planetary gearset, a third planetary gearset, a fourth planetary gearset, and a fifth planetary gearset, the input member is fixedly coupled to only the first planetary gearset of the plurality of planetary gearsets;
an output member operatively coupled to the input member through the plurality of planetary gearsets and rotatable relative to the at least one stationary member, the output member is fixedly coupled to only the fifth planetary gearset of the plurality of planetary gearsets; and
a plurality of selective couplers, wherein the plurality of selective couplers include a first number of clutches and a second number of brakes, wherein the second number is greater than the first number.

2. The transmission of claim 1 , wherein the plurality of selective couplers includes a first selective coupler which, when engaged, fixedly couples the input member to the third planetary gearset of the plurality of planetary gearsets.

3. The transmission of claim 2 , wherein the third planetary gearset of the plurality of planetary gearsets is fixedly coupled to the first planetary gearset of the plurality of planetary gearsets independent of the first selective coupler.

4. The transmission of claim 2 , wherein when the first selective coupler is engaged the input member is further fixedly coupled to the fourth planetary gearset of the plurality of planetary gearsets.

5. The transmission of claim 4 , wherein the third planetary gearset of the plurality of planetary gearsets is fixedly coupled to the first planetary gearset of the plurality of planetary gearsets independent of the first selective coupler.

6. The transmission of claim 4 , wherein the plurality of selective couplers includes a second selective coupler which, when engaged, fixedly couples the input member to the fourth planetary gearset of the plurality of planetary gearsets independent of third planetary gearset of the plurality of planetary gearsets.

7. The transmission of claim 2 , wherein the plurality of selective couplers includes a second selective coupler which, when engaged, fixedly couples the input member to the fourth planetary gearset of the plurality of planetary gearsets.

8. The transmission of claim 1 , further comprising a first interconnector which fixedly couples the second gearset component of the first planetary gearset, the second gearset component of the second planetary gearset, and the third gearset component of the third planetary gearset together.

9. The transmission of claim 1 , further comprising an interconnector which fixedly couples the third gearset component of the first planetary gearset and the first gearset component of the second planetary gearset together.

10. The transmission of claim 8 , further comprising a second interconnector which fixedly couples the third gearset component of the first planetary gearset and the first gearset component of the second planetary gearset together.

11. The transmission of claim 10 , further comprising
a third interconnector which fixedly couples the second gearset component of the third planetary gearset and the third gearset component of the fourth planetary gearset together;
a fourth interconnector which fixedly couples the first gearset component of the third planetary gearset and the first gearset component of the fourth planetary gearset together; and
a fifth interconnector which fixedly couples the second gearset component of the fourth planetary gearset and the first gearset component of the fifth planetary gearset together.

12. The transmission of claim 1 , wherein the second number is 2 more than the first number.

13. The transmission of claim 12 , wherein the second number is 5 and the first number is 3.

14. The transmission of claim 1 , wherein the plurality of selective couplers includes:
a first selective coupler which, when engaged, fixedly couples the input member and the first gearset component of the first planetary gearset to the first gearset component of the third planetary gearset and the first gearset component of the fourth planetary gearset;
a second selective coupler which, when engaged, fixedly couples the input member and the first gearset component of the first planetary gearset to the second gearset component of the third planetary gearset and the third gearset component of the fourth planetary gearset;
a third selective coupler which, when engaged, fixedly couples the third gearset component of the first planetary gearset and the first gearset component of the second planetary gearset to the at least one stationary member;
a fourth selective coupler which, when engaged, fixedly couples the second gearset component of the first planetary gearset, the second gearset component of the second planetary gearset, and the third gearset component of the third planetary gearset to the at least one stationary member;
a fifth selective coupler which, when engaged, fixedly couples the second gearset component of the third planetary gearset and the third gearset component of the fourth planetary gearset to the at least one stationary member;
a sixth selective coupler which, when engaged, fixedly couples the third gearset component of the second planetary gearset to the at least one stationary member;
a seventh selective coupler which, when engaged, fixedly couples the second gearset component of the fifth planetary gearset to the at least one stationary member; and
an eighth selective coupler which, when engaged, fixedly couples the second gearset component of the fourth planetary gearset and the first gearset component of the fifth planetary gearset to the third gearset component of the fifth planetary gearset and the output member.

15. The transmission of claim 1 , wherein each of the first planetary gearset, the second planetary gearset, the third planetary gearset, the fourth planetary gearset, and the fifth planetary gearset is a simple planetary gearset.

16. The transmission of claim 15 , wherein:
the first gearset component of the first planetary gearset is a first sun gear, the first gearset component of the second planetary gearset is a second sun gear, the first gearset component of the third planetary gearset is a third sun gear, the first gearset component of the fourth planetary gearset is a fourth sun gear, the first gearset component of the fifth planetary gearset is a fifth sun gear;
the second gearset component of the first planetary gearset is a first planet carrier, the second gearset component of the second planetary gearset is a second planet carrier, the second gearset component of the third planetary gearset is a third planet carrier, the second gearset component of the fourth planetary gearset is a fourth planet carrier, the second gearset component of the fifth planetary gearset is a fifth planet carrier; and
the third gearset component of the first planetary gearset is a first ring gear, the third gearset component of the second planetary gearset is a second ring gear, the third gearset component of the third planetary gearset is a third ring gear, the third gearset component of the fourth planetary gearset is a fourth ring gear, and the third gearset component of the fifth

Assignees

• Allison Transm Inc

Inventors

• Patel Nayan
• Briceno Jorge F

Classifications

• F16H3/66 Primary

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

• F16H2200/0065

  the gear ratios comprising nine forward speeds · CPC title

• F16H2200/0095

  the gear ratios comprising four reverse speeds · CPC title

• F16H2200/2015

  with five sets of orbital gears · CPC title

• F16H2200/2051

  with eight engaging means · CPC title