Transmission and driveline having a tilting ball variator continuously variable transmission

• US 9,541,179 B2
• Filed: 02/14/2013
• Issued: 01/10/2017
• Est. Priority Date: 02/15/2012
• Status: Active Grant

• Current Assignee: DANA Limited (Caterpillar Incorporated)
• Original Assignee: DANA Limited (Caterpillar Incorporated)
• Inventors: Cooper, Kenneth E., Versteyhe, Mark R. J.
• Primary Examiner(s): Holmes, Justin
• Assistant Examiner(s): HANNON, TIMOTHY
• Application Number:
  US14/378,750
• Publication Number:
  US 20160033021A1
• Time in Patent Office: 1,426 Days
• US Class Current: 1/1
• CPC Class Codes: F16H 15/28 with external friction surface
• CPC Class Codes: F16H 15/40 in which two members co-operative by means of balls, or rollers of uniform effective diameter, not mounted on shafts
• CPC Class Codes: F16H 15/50 Gearings providing a continuous range of gear ratios
• CPC Class Codes: F16H 15/503 in which two members co-operate by means of balls or rollers of uniform effective diameter, not mounted on shafts
• CPC Class Codes: F16H 15/52 in which a member of uniform effective diameter mounted on a shaft may co-operate with different parts of another member
• CPC Class Codes: F16H 2037/0886 with switching means, e.g. to change ranges
• CPC Class Codes: F16H 2200/2005 with one sets of orbital gears
• CPC Class Codes: F16H 37/022 the toothed gearing having orbital motion
• CPC Class Codes: F16H 37/086 CVT using two coaxial friction members cooperating with at least one intermediate friction member

Abstract

A transmission is provided. The transmission includes an input portion drivingly engaged with a power source, a planetary gear, a continuously variable variator, and a clutching device. The planetary gear arrangement has a portion drivingly engaged with the input portion. The continuously variable variator includes a portion which is drivingly engaged with at least one of the planetary gear arrangement and the input portion. The clutching device may be selectively drivingly engaged with a portion of the continuously variable variator. The clutching device and the planetary gear arrangement facilitate a transition between at least two operating modes of the continuously variable variator.

Claims

1. A continuously variable transmission comprising:

an input portion drivingly engaged with a power source;

a planetary gear arrangement comprising;

a carrier,

a plurality of planet gears,

a sun gear, and

a ring gear, wherein the carrier is drivingly engaged with the input portion;

a continuously variable tilting ball variator comprising;

a first drive ring,

a plurality of variator ball assemblies each assembly having a variator ball and variator axis, tiltably disposed on and drivingly engaged with a variator ball carrier coupled to a variator shaft,

the variator shaft, and

a second drive ring, wherein the variator is drivingly engaged with the planetary gear arrangement and the input portion; and

a first clutching device configured to be selectively drivingly engaged with a portion of the continuously variable tilting ball variator, wherein the first clutching device and the planetary gear arrangement facilitate a transition between at least two operating modes of the continuously variable tilting ball variator.

2. The transmission according to claim 1, wherein the first clutching device is configured to be selectively drivingly engaged with one of the first drive ring and the second drive ring to militate against a rotation thereof.

3. The transmission according to claim 1, wherein the continuously variable tilting ball variator is configured to be operated in an infinitely variable operating mode.

4. The transmission according to claim 3, wherein the infinitely variable operating mode is engaged by engaging the first clutching device and disengaging a second clutching device.

5. The transmission according to claim 1, further comprising a directional selector drivingly engaged with the continuously variable tilting ball variator and the power source.

6. The transmission according to claim 1, further comprising a speed selector drivingly engaged with the planetary gear arrangement and the power source.

7. The transmission according to claim 1, wherein the planetary gear arrangement comprises the carrier drivingly engaged with the power source, the sun gear drivingly engaged with the continuously variable tilting ball variator, and the ring gear drivingly engaged with an output of the transmission.

8. The transmission according to claim 1, wherein the planetary gear arrangement comprises the carrier drivingly engaged with the power source, the sun gear drivingly engaged with the continuously variable tilting ball variator, and the ring gear which may be selectively drivingly engaged with the first clutching device to militate against a rotation thereof.

9. The transmission according to claim 1, further comprising a second clutching device which is configured to be selectively drivingly engaged with a portion of the planetary gear arrangement.

10. The transmission according to claim 1, further comprising an output of the continuously variable tilting ball variator and a shaft, wherein the output is drivingly engaged with the planetary gear arrangement and the shaft is drivingly engaged with the planetary gear arrangement and the input portion.

11. The transmission according to claim 1, wherein the continuously variable tilting ball variator is configured to be operated in the continuously variable operating mode by engaging a second clutching device and disengaging the first clutching device.