Machine element or mechanism – Mechanical movements – Rotary to rotary
Patent
1998-04-13
1999-09-14
Herrmann, Allan D.
Machine element or mechanism
Mechanical movements
Rotary to rotary
74117, F16H 2904, F16H 2918
Patent
active
059504889
ABSTRACT:
A device for transmitting rotational power that relays on mechanical gearing and has a continuous range of output-to-input speed ratio comprises two radially grooved discs(16, 28), sliding teeth(22), an internally saw-toothed gear(26), a ring-shaped spring(24) and a control mechanism(38). The sliding teeth(22) are meshed with the internal gear (26) and held in their position by the spring(24). The sliding teeth(22), the internal gear(26) and the spring(24) are placed between the discs(16, 28) in such a way that side edges of each sliding teeth(22) are inside the radial grooves(18, 30) of the discs(16, 28). The radially grooved discs(16, 28) are connected at their axis of rotation. The control mechanism(38) is used to offset the axis of rotation of the discs(16, 28) from the axis of rotation of the internal gear(26) thus changing their speed ratio. The discs (16, 28) will rotate with the same speed as the internal gear(26) when their axes of rotation coincide with each other. In an offset position, the sliding tooth(22) with the smallest distance from the axis of rotation of the discs(16, 28) will transmit the power from the internal gear(26) to the discs(16, 28) while the rest of the sliding teeth(22) will be slipping over the ramps of the internally saw-toothed gear(26). Therefore the ratio of the rotational speed of the discs(16, 28) to the rotational speed of the internal gear(26) will increase as the distance between their axes is increased.
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