Continuous speed-shifting device
First Claim
1. A continuous speed-shifting device comprising:
- first, second and third rotary shafts arranged in parallel with one another;
a differential gear mechanism having first, second and third gear elements, of which the first gear element is fixedly mounted on the third rotary shaft for rotation thereon;
a variable speed pulley mechanism having first and second variable pulleys fitted to the first and the second rotary shafts, respectively, each of said pulleys including a fixed sheave fixedly mounted on an associated one of said shafts and a movable sheave axially slidably mounted on an associated one of said shafts and facing said fixed sheave, and a belt trained between both of said pulleys, thereby connecting the first and the second rotary shafts speed-changeably;
a first driving power gear mechanism connecting the first rotary shaft to the second gear element of the differential gear mechanism;
a second driving power gear mechanism connecting the first rotary shaft to the third gear element of the differential gear mechanism;
a first circulating power gear mechanism which connects the second rotary shaft to the third gear element of the differential gear mechanism;
a second circulating power gear mechanism which connects the second rotary shaft to the second gear element of the differential gear mechanism;
a first gear clutch positionable to connect the first rotary shaft to the first or the second driving power gear mechanism, or disconnect the first rotary shaft from the first or the second driving power gear mechanism; and
a second gear clutch positionable to connect the second rotary shaft to the first or the second circulating power gear mechanism, or disconnect the second rotary shaft from the first or the second circulating power gear mechanism;
whereby rotating direction of the first gear element of the differential gear mechanism is switched by positioning the first and second gear clutches and the rotational speed of the second or third gear element of the differential gear mechanism connected alternately to the first or second driving power gear mechanism, respectively, is kept higher than that of the third or second gear element connected alternately to the first or second circulating power gear mechanism, respectively, and circulating power is transmitted to the variable speed pulley mechanism.
1 Assignment
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Accused Products
Abstract
The continuous speed-shifting device of the present invention is provided with the first, second and third rotary shafts, a differential gear mechanism having the first gear element connected to the third rotary shaft, a variable speed pulley mechanism which connects the second and the third rotary shafts speed-changeably by a belt, a driving power gear mechanism which connects the first rotary shaft to the second or the third gear element of the differential gear mechanism and a circulating power gear mechanism which connects the second rotary shaft to the third or the second gear element of the differential gear mechanism. According to switching of the advancing and the retreating, the first rotary shaft and the driving power gear mechanism or the second rotary shaft and the circulating power gear mechanism are connected or disconnected by the gear clutch. Large driving power transmitted from the first rotary shaft to the differential gear mechanism is passed through the gear mechanism but small circulating power returned to the first rotary shaft from the differential gear mechanism is always passed through the pulley mechanism. When the first rotary shaft and the driving power gear mechanism or the second rotary shaft and the circulating power gear mechanism are connected with each other by a gear clutch, rotation of the third rotary shaft is made zero to obtain a neutral state.
22 Citations
6 Claims
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1. A continuous speed-shifting device comprising:
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first, second and third rotary shafts arranged in parallel with one another; a differential gear mechanism having first, second and third gear elements, of which the first gear element is fixedly mounted on the third rotary shaft for rotation thereon; a variable speed pulley mechanism having first and second variable pulleys fitted to the first and the second rotary shafts, respectively, each of said pulleys including a fixed sheave fixedly mounted on an associated one of said shafts and a movable sheave axially slidably mounted on an associated one of said shafts and facing said fixed sheave, and a belt trained between both of said pulleys, thereby connecting the first and the second rotary shafts speed-changeably; a first driving power gear mechanism connecting the first rotary shaft to the second gear element of the differential gear mechanism; a second driving power gear mechanism connecting the first rotary shaft to the third gear element of the differential gear mechanism; a first circulating power gear mechanism which connects the second rotary shaft to the third gear element of the differential gear mechanism; a second circulating power gear mechanism which connects the second rotary shaft to the second gear element of the differential gear mechanism; a first gear clutch positionable to connect the first rotary shaft to the first or the second driving power gear mechanism, or disconnect the first rotary shaft from the first or the second driving power gear mechanism; and a second gear clutch positionable to connect the second rotary shaft to the first or the second circulating power gear mechanism, or disconnect the second rotary shaft from the first or the second circulating power gear mechanism; whereby rotating direction of the first gear element of the differential gear mechanism is switched by positioning the first and second gear clutches and the rotational speed of the second or third gear element of the differential gear mechanism connected alternately to the first or second driving power gear mechanism, respectively, is kept higher than that of the third or second gear element connected alternately to the first or second circulating power gear mechanism, respectively, and circulating power is transmitted to the variable speed pulley mechanism. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification