Power transmission mechanism

• US 4,177,683 A
• Filed: 09/19/1977
• Issued: 12/11/1979
• Est. Priority Date: 09/19/1977
• Status: Expired due to Term

• Current Assignee: Darmo Corporation
• Original Assignee: Darmo Corporation
• Inventors: Moses, Darcy C.
• Primary Examiner(s): Scott, Samuel
• Assistant Examiner(s): Henderson, William R.
• Application Number:
  US05/834,279
• Time in Patent Office: 813 Days
• Field of Search: 74/198, 74/199, 74/200, 74/201, 74/193
• US Class Current: 476/30
• 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

Abstract

A variable power transmission mechanism including a first disc rotatable about a first axis and having a flat surface perpendicular to the first axis, a second disc rotatable about a second axis and providing a flat surface perpendicular to the second axis, apparatus positioning the first and second discs in spaced apposition so that the flat surfaces define planes intersecting at an acute dihedral angle and including a ratio varying arrangement for causing displacement between the discs in a direction aligned with the vertex of the dihedral angle, a ball which makes contact with the surfaces along circles concentric with the respective axes and is resiliently urged toward the vertex of the dihedral angle, a guide for causing displacement of the ball in a direction aligned with the vertex, and an interconnection between the ratio varying arrangement and the ball guide for causing displacement of the latter simultaneously with and proportional to displacement between the discs. An embodiment is shown in which two transmission mechanisms are serially interconnected by a sprocket chain and have their ratio varying arrangements connected for simultaneous operation.

Claims

1. A variable ratio power transmission mechanism comprising, in combination:

a driving member rotatable about a first axis and having a flat surface perpendicular to said first axis;

a driven member rotatable about a second axis and having a flat surface perpendicular to said second axis;

mounting means positioning said member in spaced apposition so that said surfaces define planes intersecting at an acute dihedral angle, said mounting means including ratio varying means for causing relative motion between said members in a direction aligned with the vertex of said dihedral angle;

rolling means making contact with said surfaces along circles concentric with said axes;

and means resiliently urging said rolling means toward the vertex of said dihedral angle.

6. A mechanism according to claim 1 in which said rolling means engages both said driving members on the sides thereof outward from said axes.

8. In combination:

first and second mechanisms according to claim 1, arranged so that the vertices of said dihedral angles are aligned, and so that the first and second axes of the first mechanism are parallel respectively with the second and first axes of the second mechanism;

means connecting the driven member of the first mechanism in driving relation to the driving member of the second mechanism;

and means for activating the ratio varying means of both mechanisms unitarily.

9. In combination:

first and second mechanisms according to claim 1;

means connecting the driven member of the first mechanism in driving relation to the driving member of the second mechanism;

and means for actuating the ratio varying means of both mechanisms unitarily.

11. A plurality of mechanisms according to claim 1;

means connecting said mechanisms in a sequence with the driven member of each preceding mechanism connected to drive the driving member of the successive mechanism;

and means for actuating the ratio varying means of said mechanisms unitarily.

2. A variable ratio power transmission mechanism comprising, in combination:

a driving member rotatable about a first axis and having a flat surface perpendicular to said first axis;

a driven member rotatable about a second axis and having a flat surface perpendicular to said second axis;

mounting means positioning said members in spaced apposition so that said surfaces define planes intersecting at an acute dihedral angle;

rolling means making contact with said surfaces along circles concentric with said axes;

and means resiliently urging said rolling means toward the vertex of said dihedral angle;

said mounting means including ratio varying means enabling relative movement between said members in a direction aligned with said vertex, accompanied by displacement of said rolling means in the same direction.

3. A mechanism according to claim 2 in which the displacement of said rolling means is proportional to the displacement of said mounting means.

4. A mechanism according to claim 2 in which the displacement of said rolling means is along lines intersecting said first and second axes.

5. A mechanism according to claim 4 in which the diameter of said rolling means is no less than the distance between parallel lines in said surfaces passing through said axes.

10. In combination:

first and second mechanisms according to claim 2;

means connecting the driven member of the first mechanism in driving relation to the driving member of the second mechanism;

and means for actuating the ratio varying means unitarily.

7. A power transmission mechanism comprising, in combination:

a pair of discs, having spaced apposed flat surfaces lying in planes which intersect at a small dihedral angle, and rotatable about axes perpendicular to said planes;

rolling means between said discs engaging said surfaces at predetermined radii from said axes to transmit power therebetween;

and mounting means for said discs and said rolling means adjustable to enable variation in the ratio of said radii, said mounting means being adjustable in a direction aligned with the vertex of said dihedral angle.

12. In combination:

support means comprising first and second generally parallel mounting plates arranged for securement as ends to a housing which determines the spacing between said plates;

input means comprising a shaft extending through and rotatable about a first axis in said first mounting plate, and terminating within said housing in a first disc having a flat surface perpendicular to said first axis;

a first stub shaft extending through said second mounting plate and rotatable about a second axis therein, and terminating within said housing in a second disc having a flat surface perpendicular to said second axis;

a second stub shaft extending through said second mounting plate and rotatable about a second axis therein, and terminating within said housing in a third disc having a flat surface perpendicular to said third axis;

output means comprising a shaft extending through said first mounting plate and rotatable about a fourth axis therein, and terminating within said housing in a fourth disc having a flat surface perpendicular to said fourth axis;

mounting means carried by said second mounting plate for positioning said stub shafts so that said second and third surfaces are in spaced apposition to said first and fourth surfaces, respectively, and define therewith respectively pairs of planes intersecting at first and second acute dihedral angles;

first rolling means making contact with said first and second surfaces along circles concentric with said first and second axes;

second rolling means making contact with said third and fourth surfaces along circles concentric with said third and fourth axes;

means connecting said first stub shaft in driving relation to said second stub shaft;

ratio varying means operative to move said mounting means with respect to said second mounting plate, to cause relative movement between said second and first discs and said third and fourth discs, respectively, in directions aligned with said vertices of said dihedral angle;

and means resiliently urging said first and second rolling means toward the vertices of said first and second dihedral angle.

13. A structure according to claim 12 in which said ratio varying means further causes displacement of said first and second rolling means, in the same directions as those followed by said second and third discs respectively.

14. A structure according to claim 13 in which the displacement of said rolling means is proportional to the relative movement of said second and third discs with respect to said first and fourth discs.

15. A structure according to claim 12 in which said vertices of said dihedral angles are colinear and the movement of said mounting means is linear and parallel to said vertices.

16. A structure according to claim 13 in which the action of the ratio adjusting means causes movement of said first and second rolling means along lines which are radial with respect to said first and second axes and said third and fourth axes respectively.

17. In combination:

first and second discs having plane, parallel surfaces;

means mounting said discs for rotation in their own planes;

input means for causing rotation of said first disc;

output means rotatable with said second disc;

and means mechanically interconnecting said discs to transfer said rotation from said first disc to said second disc, including

further disc means mounted for rotation in a plane making a small dihedral angle with the planes of said first and second discs;

rolling means making contact separately between said first and second discs and said disc means;

and means causing lateral displacement between said disc means and said discs, and simultaneously causing proportional displacement of said rolling means in the same direction.