Continuously variable friction roll toroidal drive

• US 20050064986A1
• Filed: 11/18/2004
• Published: 03/24/2005
• Est. Priority Date: 05/25/2002
• Status: Abandoned Application

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: Ginglas, Eduard
• Application Number:
  US10/990,969
• Publication Number:
  US 20050064986A1
• Time in Patent Office: Days
• US Class Current: 476/40
• CPC Class Codes: F16H 15/38 with two members B having hollow toroid surfaces opposite to each other, the member or members A being adjustably mounted between the surfaces

Abstract

A continuously variable friction roll toroidal drive includes two variator disks which are rotatable about a common roll axis and which have tracks which are part of the circumferential surface of a torus concentric with the variator roll axis, and a plurality of rollers in contact with the tracks, each being mounted for rotation in a housing with which a support is associated. The axis of rotation of each roller being able to turn about an axis which is inclined at a certain angle to the center plane of the torus. The direction of the action of the support of each roller lies in the center plane of the torus. Each roller is mounted for rotation on a turning body. The turning body is mounted for turning in the housing, the axis of rotation of the turning body being inclined at a certain angle to the center plane of the torus.

Claims

1. A continuously variable friction roll toroidal drive comprising:

two variator disks which can be turned about a common roll axis, wherein the variator disks each have a track that is part of a circumferential surface of a torus concentric with the common roll axis;

two or more rollers in contact with the tracks of the variator disks;

a housing for each roller, wherein the rollers are mounted for rotation in the respective housings;

a support associated with each housing, wherein the axis of rotation of each roller can turn on an axis which is inclined at an angle to a central plane of the torus;

a hydraulically operated piston to which each support is joined, wherein the direction of action of each support lies in the center plane of the torus; and

a turning body for each roller, wherein each roller is mounted for rotation on its turning body, and wherein the turning body is mounted for turning in the housing, while the axis of rotation of the turning body is inclined at the angle to the center plane of the torus.

2. The toroidal drive according to claim 1, wherein the housing includes a fork joined to the support and a pin joined for co-rotation with the support, and wherein the pin has journals projecting bilaterally whose common axis is inclined at the angle to the center plane of the torus, the turning body being mounted for rotation on the journals.

3. The toroidal drive according to claim 2, wherein the support includes a piston shaft, wherein the shaft is joined with the hydraulic piston, is guided for axial movement and is secured against rotation.

4. The toroidal drive according to claim 3, wherein the piston shaft is guided in a cylinder housing for a bilaterally driven piston.

5. The toroidal drive according to claim 4, wherein the housing is joined to the support by a joint whose axis lies in the center plane of the torus and is at a right angle to the direction of the action of the support.

6. The toroidal drive according to claim 4, wherein the housing is joined to the support by a cardan joint whose one axis lies in the center plane of the torus and is at a right angle to the direction of the action of the support and whose second axis is at a right angle to the center plane of the torus and to the direction of the action of the support .

7. The toroidal drive according to claim 4, wherein the housing is joined to the support through a ball joint.

8. The toroidal drive according to claim 7, wherein the pivot pin is joined for rotational adjustment, the adjustment axis of the pivot pin coinciding with the roll axis of the roller.

9. The toroidal drive according to claim 1, wherein the support includes a piston shaft, wherein the shaft is joined with the hydraulic piston, is guided for axial movement and is secured against rotation.

10. The toroidal drive according to claim 9, wherein the piston shaft is guided in a cylinder housing for a bilaterally driven piston.

11. The toroidal drive according to claim 1, wherein the housing is joined to the support by a joint whose axis lies in the center plane of the torus and is at a right angle to the direction of the action of the support.

12. The toroidal drive according to claim 1, wherein the housing is joined to the support by a cardan joint whose one axis lies in the center plane of the torus and is at a right angle to the direction of the action of the support and whose second axis is at a right angle to the center plane of the torus and to the direction of the action of the support.

13. The toroidal drive according to claim 1, wherein the housing is joined to the support through a ball joint.

14. The toroidal drive according to claim 2, wherein the pivot pin is joined for rotational adjustment, the adjustment axis of the pivot pin coinciding with the roll axis of the roller.