Direct torque path differential having spiderless pinions

Patent metadata

Field	Value
Publication number	US-10082199-B2
Application number	US-201514710159-A
Country	US
Kind code	B2
Filing date	May 12, 2015
Priority date	May 12, 2015
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

A differential is disclosed for use with a drivetrain of a mobile machine. The differential may have an input gear, a first side gear, a second side gear, and a side pinion disposed axially between and intermeshed with the first and second side gears. The differential may also have a carrier nested inside of the input gear and connected to the input gear and the side pinion. The carrier may at least partially surround the first side gear and the second side gear.

First claim

What is claimed is:

1. A differential, comprising:
an input gear;
a first side gear;
a second side gear;
a side pinion disposed axially between and intermeshed with the first and second side gears; and
a carrier nested inside of the input gear and connected to the input gear and the side pinion, the carrier at least partially surrounding the first side gear and the second side gear, and wherein the carrier is axially free-floating relative to the input gear.

2. The differential of claim 1 , wherein the carrier is an integral cylindrical component having a first open end, a second open end, and a cavity formed between the first and second open ends.

3. The differential of claim 1 , wherein the carrier is cylindrical and formed by multiple separate components that are annularly spaced apart from each other.

4. The differential of claim 3 , wherein each of the multiple separate annular components is substantially identical.

5. The differential of claim 3 , further including spacers located between each of the multiple separate components.

6. The differential of claim 5 , wherein the spacers are integral to the input gear and protrude radially inward to spaces between the multiple separate components.

7. The differential of claim 1 , wherein the carrier includes external splines configured to engage the input gear.

8. The differential of claim 1 , further including a cup formed at an inner annular surface of the carrier that is configured to receive the side pinion.

9. The differential of claim 1 , further including a plurality of housing members connectable to the input gear to enclose the carrier.

10. The differential of claim 9 , wherein:
the differential further includes at least one axial spacer disposed between the plurality of housing members and the carrier.

11. The differential of claim 9 , wherein the plurality of housing members includes:
a first housing member configured to engage a first axial end of the input gear; and
a second housing member configured to engage a second axial end of the input gear opposite the first axial end.

12. The differential of claim 11 , wherein the first and second housing members are substantially identical to each other.

13. The differential of claim 11 , further including a lockup clutch disposed between the carrier and the first side gear.

14. The differential of claim 13 , wherein the first housing member is axially longer than the second housing member and configured to enclose the lockup clutch.

15. The differential of claim 13 , wherein the carrier extends axially past an outer end of the first side gear to internally receive the lockup clutch.

16. A differential, comprising:
an input gear;
a first side gear located at a first axial end of the input gear;
a second side gear located at a second axial end of the input gear opposite the first side gear;
a side pinion disposed axially between and intermeshed with the first and second side gears; and
a carrier connected between the input gear and the side pinion, wherein the carrier is moveable relative to the input gear.

17. The differential of claim 16 , wherein the carrier is an integral cylindrical component having a first open end, a second open end, and a cavity formed between the first and second open ends.

18. The differential of claim 16 , wherein the carrier is cylindrical and formed by multiple separate components that are annularly spaced apart from each other.

19. The differential of claim 18 , further including spacers located between each of the multiple separate components, wherein the spacers are integral to the input gear and protrude radially inward to spaces between the multiple separate components.

20. A drivetrain for a mobile machine having first and second traction devices located at opposing sides, the drivetrain comprising:
a power source;
a transmission driven by the power source;
a main pinion operatively connected to an output of the transmission;
a first half-shaft connected to the first traction device;
a second half-shaft connected to the second traction device; and
a differential driven by the main pinion to rotate the first and second half-shafts with substantially equal torque, the differential including:
an input gear;
a first side gear located at a first axial end of the input gear;
a second side gear located at a second axial end of the input gear opposite the first side gear;
a side pinion disposed axially between and intermeshed with the first and second side gears;
a carrier nested inside of the input gear and connected to the input gear via a splined interface, wherein the carrier is further connected to the side pinion, the carrier at least partially surrounding the first side gear and the second side gear;
a first housing member connected to the first axial end of the input gear and at least partially enclosing the carrier;
a second housing member connected to the second axial end of the input gear and at least partially enclosing the carrier; and

at least one spacer disposed between the first and second side gears and the first and second housing members, the at least one spacer configured to axially space the carrier relative to the input gear.

Assignees

• Caterpillar Inc

Inventors

• ADRAGNA Omar Jose
• Thompson David Owen

Classifications

• F16H2048/087

  characterised by the pinion gears, e.g. their type or arrangement · CPC title

• F16H48/08 Primary

  comprising bevel gears · CPC title

• F16H48/22

  using friction clutches or brakes · CPC title

• F16H48/40 Primary

  characterised by features of the rotating cases · CPC title

• F16H2702/06

  Combinations of transmissions with parallel force splitting paths having same output · CPC title