Machine element or mechanism – Mechanical movements – Rotary to intermittent unidirectional motion
Patent
1989-12-20
1990-11-06
Diehl, Dwight
Machine element or mechanism
Mechanical movements
Rotary to intermittent unidirectional motion
74124, 74125, 741255, F16H 2900
Patent
active
049676156
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to transmissions.
2. Background Art
Transmissions convert rotary motion of a drive shaft to rotary motion of a driven shaft at a different speed and torque. Mechanical transmissions typically make use of gearing having two or more selectable fixed ratios to reduce or increase rotation of an input shaft. Hydraulic transmissions make use of fluid interacting with impellers to transmit rotary motion from one shaft to another over a range of drive ratios. Both have drawbacks.
Gearing typically operates using fixed input to output ratios. The ratio can usually be changed only by changing gears. Such transmissions are therefore usually large and heavy mechanisms. Weight of the transmission and friction loss through the various combinations of gears can substantially reduce the efficiency of an entire drive train.
The disadvantage of hydraulic conversion is the ever-present "slip" from the lack of positive interaction between driving and driven shafts. Hydraulic transmissions also suffer from bulk and are typically very costly.
Many attempts have been made to eliminate these disadvantages by providing a continuously variable speed change by simple mechanical means. However, a need remains for an infinitely variable speed transmission which is reliable and capable of a long operating life.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the invention are illustrated in the accompanying drawings, in which:
FIG. 1 is a longitudinal diagrammatic and partical sectional view of a transmission in accordance with the invention;
FIG. 2 is an enlargement of FIG. 1 with the transmission housing having been removed; it is divided into two parts, FIG. 2A and 2B;
FIG. 3 is a perpendicular planar view taken through line 3--3 in FIG. 1;
FIG. 4 is a perpendicular planar view taken through line 4--4 in FIG. 1 showing the transmission in a first operating condition;
FIG. 5 is a perpendicular planar view as would be taken through line 4--4 in FIG. 1 when the transmission is configured to be in a second operating condition;
FIG. 6 is a perpendicular planar view taken through line 6--6 in FIG. 1 showing the transmission in the first operating condition;
FIG. 7 is a perpendicular planar view as would be taken through line 6--6 in FIG. 1 when the transmission is configured to be in the second operating condition;
FIG. 8 is a perpendicular planar view taken along line 8--8 in FIG. 1 showing the transmission in the first operating condition;
FIG. 9 is a perpendicular planar view as would be taken through line 8--8 in FIG. 1 when the transmission is configured to be in the second operating condition;
FIG. 10 is a perspective view of sun and planetary gear components of the transmission employed for driving the output driven shaft;
FIG. 11 is a diagrammatic section view of a free-wheeling unidirectional clutch employed in the transmission;
FIG. 12 is a plan view of the relationships regarding sizing of various components of the transmission for maximizing efficiency;
FIG. 13 is a diagrammatic perpendicular planar view of an alternate embodiment transmission as would appear if taken through a plane corresponding in location to plane 6--6 in FIG. 1;
FIG. 14 is a diagrammatic perpendicular planar view of the transmission of FIG. 13 as would be taken through the same plane when the alternate embodiment transmission is configured to be in a second operating condition. The second operating condition shown corresponds to the same second operating condition of the first described embodiment as shown in FIGS. 5 and 7;
FIG. 15 is a partial longitudinal diagrammatic and partial sectional view of the transmission components of FIG. 13;
FIG. 16 is a perspective view of a spider component of the transmission of FIG. 13;
FIG. 17 is a side view of an eccentric coupling link component of the transmission of FIG. 13; and
FIG. 18 is a right end view of FIG. 17.
FIG. 19 is a diagrammatic illustration of the geometric relationships of various components of the alternate embodiment transmission
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Anchell Scott
Diehl Dwight
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