| English term or phrase: stator clocking angle | http://www.google.nl/patents/US8360917
Passing now to FIGS. 6-9, in one embodiment the second stator 38 is a substantially disc-shaped body 50 having a central bore 52. The central bore 52 facilitates the coupling of the second stator 38 to the main axle 22. The disc-shaped body 50 can be provided with a plurality of radially off-set curved guide slots 54 arranged angularly about the central bore 52. Each radially off-set guide slot 54 is sized to accommodate the coupling of the second stator 38 to the planet axle 42. The radially off-set guide slots 54 are angularly offset from a radial construction line 56 when viewed in the plane of the page of FIG. 8. The angular offset can be approximated by an angle 58. The angle 58 is formed between the radial construction line 56 and a construction line 60. The construction line 60 substantially bisects the guide slot 54 when viewed in the plane of the page of FIG. 8. In some embodiments, the angle 58 is between 3 degrees and 45 degrees. A low angle 58 would provide faster shift rates in a given application but ***stator clocking angle (beta)*** must be controlled over a very small range. A high angle 58 would provide slower shift rates in a given application but stator clocking angle (beta) would be controlled over a larger range. In effect, a low angle 58 is highly responsive in transmission ratio change but potentially more difficult to control or stabilize, while a high angle can be less responsive in transmission ratio change but easy to control by comparison. In some embodiments, where it is desirable to have high speed, fast shift rates, the angle 58 can be, for example, 10 degrees. In other embodiments, where it is desirable to have slower speed, precise control of transmission ratio, the angle 58 can be about 30 degrees. However, the said values of the angle 58 are provided as an illustrative example, and the angle 58 can be varied in any manner a designer desires. In some embodiments, the angle 58 can be any angle in the range of 10 to 25 degrees including any angle in between or fractions thereof. For example, the angle can be 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, or any portion thereof. In other embodiments, the angle 58 can be 20 degrees. In one embodiment, the radially off-set guide slots 54 can be arranged so that the construction line 60 is linearly offset from a construction line 61 by a distance 62. The construction line 61 is parallel to the construction line 60 and intersects the center of the disc-shaped body 50. In other embodiments, such as the one illustrated in FIG. 8A, the second stator 38 can be provided with a guide slot 53. The guide slot 53 can be substantially similar to the guide slot 54. The guide slot 53 can have a substantially curved profile when viewed in the plane of the page of FIG. 8A. The curvature of the guide slot 53 can be generally defined by a construction line 57. For illustrative purposes, a construction line 57 can be shown tangent to the construction line 60. In some embodiments, the construction line 57 is a constant radius curve. In other embodiments, the construction line 57 can be a non-constant radius curve. The curvature of the construction line 57, and consequently the curvature of the guide slot 53, can be configured to provide the desired control stability and response of the CVT 10. |
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