Multi-mode integrated starter-generator device with dog clutch arrangement

Patent metadata

Field	Value
Publication number	US-10920730-B2
Application number	US-201916385989-A
Country	US
Kind code	B2
Filing date	Apr 16, 2019
Priority date	Apr 16, 2019
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

A combination starter-generator device is provided for a work vehicle having an engine. The starter-generator device includes 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 is configured to operate in one of at least a first gear ratio, a second gear ratio, or a third gear ratio in the first power flow direction and at least a fourth gear ratio in the second power flow direction. The starter-generator device further includes a dog clutch arrangement selectively coupled to the gear set to effect the first, second, and third gear ratios in the first power flow direction and the fourth gear ratio in the second power flow direction.

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 gear ratio, a second gear ratio, or a third gear ratio in the first power flow direction and at least a fourth gear ratio in the second power flow direction; and
a dog clutch arrangement selectively coupled to the gear set to effect the first, second, and third gear ratios in the first power flow direction and the fourth gear ratio in the second power flow direction.

2. The combination starter-generator device of claim 1 ,
wherein the dog clutch arrangement includes at least a first clutch and a second clutch, each selectively repositionable between an engaged position and a disengaged position, and
wherein the first and second clutches are ring-shaped with the second clutch concentrically arranged within the first clutch when both of the first and second clutches are in the disengaged positions.

3. The combination starter-generator device of claim 2 , wherein the first clutch includes a first ring base and at least one first clutch tooth extending from the first ring base and the second clutch includes a second ring base and at least one second clutch tooth extending from the second ring base.

4. The combination starter-generator device of claim 3 ,
wherein the at least one first clutch tooth is engaged with the gear set to effect the first gear ratio when the first clutch is in the engaged position and is disengaged from the gear set when the first clutch is in the disengaged position, and
wherein the at least one second clutch tooth is engaged with the gear set to effect the second gear ratio when the second clutch is in the engaged position and is disengaged from the gear set when the second clutch is in the disengaged position.

5. The combination starter-generator device of claim 4 ,
wherein the dog clutch arrangement further includes a third clutch, also repositionable between the engaged position and the disengaged position, with a third ring base and at least one third clutch tooth extending from the third ring base, the third clutch being concentrically arranged within the second clutch when both of the second and third clutches are in the disengaged positions, and
wherein the at least one third clutch tooth is engaged with the gear set when the third clutch is in the engaged position and is disengaged from the gear set when the third clutch is in the disengaged position.

6. The combination starter-generator device of claim 5 ,
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.

7. The combination starter-generator device of claim 6 , further comprising a spring arrangement positioned in between the first clutch, the second clutch, and the third clutch and the stator plate and configured to selectively move the first clutch, the second clutch, and the third clutch from the engaged positions into the disengaged positions.

8. The combination starter-generator device of claim 6 , further comprising a cam actuator configured to selectively move the first clutch, the second clutch, and the third clutch from the disengaged positions into the engaged positions.

9. The combination starter-generator device of claim 8 ,
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 opening, the at least one second opening, and the at least one third opening are configured to accommodate the cam actuator when the first, second, and third clutches are respectively in the disengaged positions.

10. The combination starter-generator device of claim 9 , wherein the at least one first opening is immediately adjacent the at least one first clutch tooth, the at least one second opening is immediately adjacent the at least one second clutch tooth, and at least one third opening is immediately adjacent the at least one third clutch tooth.

11. The combination starter-generator device of claim 10 , wherein the first clutch is formed by a stamping process to form the at least one first tooth and the at least one first opening.

12. The combination starter-generator device of claim 9 ,
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, in a cold engine start mode, 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 the first gear ratio; and
wherein, in a warm engine start mode, 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 the second gear ratio.

13. The combination starter-generator device of claim 12 ,
wherein, in a boost mode, 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 the third gear ratio; and
wherein, in a generation mode, 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, rotational power from the engine moves in the second power flow direction from the ring gear, to the first-stage and second-stage planet gears, to the first-stage and second-stage sun gears, and to the input shaft out to the electric machine at the fourth gear ratio.

14. The combination starter-generator device of claim

Assignees

• Deere & Co

Inventors

• Fliearman Steven R
• Lloyd Lisa R

Classifications

• B60K6/365

  with the gears having orbital motion · CPC title

• F16D11/10

  with clutching members movable only axially · CPC title

• F16D21/02

  for interconnecting three or more shafts or other transmission members in different ways (in endless-track vehicles B62D) · CPC title

• F02N15/022 Primary

  the starter comprising an intermediate clutch · CPC title

• F16H2200/2094

  using positive clutches, e.g. dog clutches · CPC title