Multi-mode integrated starter-generator device with cam arrangement

Patent metadata

Field	Value
Publication number	US-10975937-B2
Application number	US-201916385964-A
Country	US
Kind code	B2
Filing date	Apr 16, 2019
Priority date	Apr 16, 2019
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

A combination starter-generator device includes an electric machine and a gear set configured to couple the electric machine and the engine in first and second power flow directions. The gear set is configured to operate in one of at least a first mode, a second mode, or a third mode in the first power flow direction and at least a fourth mode in the second power flow direction. The starter-generator device includes a clutch arrangement with at least one clutch selectively coupled to the gear set to effect the first, second, and third mode in the first power flow direction and the fourth mode in the second power flow direction; and a cam plate configured to shift the at least one clutch between a disengaged position and an engaged position relative to the gear set.

First claim

What is claimed is:

1. A combination starter-generator device for a work vehicle having an engine, the starter-generator device comprising:
an electric machine;
a gear set configured to receive rotational input from the electric machine and from the engine and to couple the electric machine and the engine in a first power flow direction and a second power flow direction, the gear set configured to operate in one of at least a first mode, a second mode, or a third mode in the first power flow direction and at least a fourth mode in the second power flow direction;
a clutch arrangement with at least one clutch selectively coupled to the gear set to effect the first, second, and third modes in the first power flow direction and the fourth mode in the second power flow direction; and
a cam plate being disc-shaped with a first face and a second face and a plurality of cam teeth extending from the first face to engage with and shift the at least one clutch from a disengaged position in which the at least one clutch is decoupled from the gear set into an engaged position in which the at least one clutch is coupled to the gear set.

2. The combination starter-generator device of claim 1 , wherein the at least one clutch includes the first clutch and the second clutch, each selectively repositionable between the engaged position and the disengaged position, and wherein the plurality of cam teeth includes at least one first cam tooth positioned on the cam plate to selectively engage the first clutch into the engaged position and at least one second cam tooth positioned on the cam plate to selectively engage the second clutch into the engaged position.

3. The combination starter-generator device of claim 2 , wherein the cam plate is configured to be pivoted through a range of angular positions, wherein, at a first angular position, the at least one first cam tooth engages the first clutch and the second clutch remains disengaged relative to the at least one second cam tooth, and at a second angular position, the at least one second cam tooth engages the second clutch and the first clutch remains disengaged relative to the at least one first cam tooth.

4. The combination starter-generator device of claim 3 , wherein the at least one first cam tooth is radially and circumferentially offset relative to the at least one second cam tooth.

5. The combination starter-generator device of claim 4 ,
wherein the at least one clutch further includes a third clutch selectively repositionable between the engaged position and the disengaged position, and
wherein the plurality of cam teeth further includes at least one third cam tooth positioned on the cam plate to selectively engage the third clutch into the engaged position.

6. The combination starter-generator device of claim 5 ,
wherein the at least one third cam tooth is radially and circumferentially offset relative to the at least one first cam tooth and the at least one second cam tooth, and
wherein the cam plate, at a third angular position, is configured such that the at least one third cam tooth engages the third clutch and the first clutch and the second clutch remain disengaged relative to the at least one first cam tooth and the at least one second cam tooth.

7. The combination starter-generator device of claim 6 , further comprising an actuator assembly coupled to the cam plate and configured to pivot the cam plate between the first, second, and third angular positions.

8. The combination starter-generator device of claim 6 , wherein the clutch arrangement is a dog clutch arrangement and the first, second, and third clutches are concentrically arranged in the disengaged positions such that the second clutch is positioned within the first clutch and the third clutch is positioned within the second clutch.

9. The combination starter-generator device of claim 8 ,
wherein the first clutch includes a first ring base and at least one first clutch tooth extending from the first ring base, the second clutch includes a second ring base and at least one second clutch tooth extending from the second ring base, and the third clutch includes a third ring base and at least one third clutch tooth extending from the third ring base, and
wherein, in the respective engaged positions of the first, second, and third clutches, the at least one first tooth, the at least one second tooth, and the at least one third tooth are engaged with the gear set.

10. The combination starter-generator device of claim 9 ,
wherein the dog clutch arrangement further includes a stator plate axially in between the gear set and the first, second, and third clutches when the first, second, and third clutches are in the disengaged positions,
wherein the stator plate defines at least one first slot, at least one second slot, and at least one third slot, and
wherein the at least one first slot receives the at least one first clutch tooth when the first clutch is in the engaged position, the at least one second slot receives the at least one second clutch tooth when the second clutch is in the engaged position, wherein the at least one third slot receives the at least one third clutch tooth when the third clutch is in the engaged position.

11. The combination starter-generator device of claim 10 ,
wherein the first clutch includes at least one first opening, the second clutch includes at least one second opening, and the third clutch includes at least one third opening, and
wherein the at least one first, second, and third openings are configured to accommodate the cam actuator when the first, second, and third clutches are respectively in the disengaged positions.

12. The combination starter-generator device of claim 11 ,
wherein the gear set includes a compound epicyclic gear train including an input shaft, first-stage and second-stage sun gears, first-stage and second-stage planet gears, first-stage and second-stage carriers, and a ring gear with the first-stage planet carrier splined to the second-stage sun gear, and wherein the first-stage planet gears have a different gear tooth count than the second-stage planet gears;
wherein the first mode is a cold engine start mode in which the first clutch is in the engaged position to ground the second-stage planet carrier and the second and third clutches are in the disengaged positions, and further, rotational power from the electric machine moves in the first power flow direction from the input shaft, to the first-stage sun gear, to the first stage-planet gears, to the first-stage planet carrier, to the second-stage sun gear, to the second-stage planet gears, and to the ring gear out to the engine at a first gear ratio; and
wherein the second mode is a warm engine start mode in which the second clutch is in the engaged position to ground the second-stage sun gear and the first and third clutches are in the disengaged positions, and further, the rotational power from the electric machine moves in the first power flow direction from the input shaft, to the first-stage sun gear, to the first stage-planet gears, and to the ring gear out to the engine at a second gear ratio.

13. The combination starter-generator device of claim 12 ,
wherein the third mode is a boost mode in which the third clutch is in the engaged position to couple the second-stage sun gear to the first-stage sun gear and the first and second clutches are in the disengaged positions, and further, the rotational power from the electric machine moves in the first power flow direction from the input shaft, to the first-stage and second-stage sun gears, to the first-stage and second-stage planet gears, and to the ring gear out to the engine at a

Assignees

• Deere & Co

Inventors

• Fliearman Steven R
• Lloyd Lisa R

Classifications

• F16H3/76 Primary

  with an orbital gear having teeth formed or arranged for obtaining multiple gear ratios, e.g. nearly infinitely variable · CPC title

• F02N11/04 Primary

  the motors being associated with current generators · CPC title

• F16H2200/2038

  with three engaging means · CPC title

• F02N15/02

  Gearing between starting-engines and started engines; Engagement or disengagement thereof · CPC title

• F16H3/66

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