Endless belt power transmission systems or components – Pulley with belt-receiving groove formed by drive faces on... – Including actuator interconnecting plural pulleys on spaced...
Patent
1998-08-05
2000-11-07
Bucci, David A.
Endless belt power transmission systems or components
Pulley with belt-receiving groove formed by drive faces on...
Including actuator interconnecting plural pulleys on spaced...
474 21, 474135, 475210, 475211, 74606R, F16H 5900, F16H 3702, F16H 5702
Patent
active
061428981
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a continuously variable speed transmission for vehicle provided with a differential gear mechanism and a belt variable speed mechanism and a mowing tractor using the continuously variable speed transmission, and particularly relates to a technique of increasing the ability of a continuously variable speed transmission to be laid out when the transmission is mounted on a vehicle.
BACKGROUND ART
As an example of a continuous variable speed transmission used in a manner to be mounted on an agricultural vehicle or the like, there is well known a belt-type transmission comprising a belt variable speed mechanism. In the belt variable speed mechanism, an input shaft and an output shaft, placed in parallel with each other, are each provided with a variable speed pulley composed of (a) a fixed sheave mounted on the shaft for unitary rotation and for no movement along the shaft and (b) a movable sheave which is opposed to the fixed sheave so as to form a V-shaped belt groove therebetween and is supported to the shaft for unitary rotation and for movement along the shaft, and a variable speed belt is wound between the belt grooves formed in both the variable speed pulleys on the input and output shafts. The movable sheaves of the variable speed pulleys are moved along the input and output shafts, respectively, so that respective effective radiuses of the variable speed pulleys with respect to the variable speed belt are changed. As a result, a speed ratio between the input and output shafts is changed.
Japanese Patent Application Laid-Open Gazette No. 62-118159 proposes a continuously variable speed transmission in which a belt variable speed mechanism having the above structure and a gear mechanism are arranged in parallel between input and output shafts and a planetary gear mechanism as a differential gear mechanism is disposed among the belt variable speed mechanism, the gear mechanism and the output shaft.
In the proposed continuously variable speed transmission, the planetary gear mechanism has three gear elements, the first gear element is connected to the gear mechanism thereby constituting a power transmission path, the second gear element is connected to the belt variable speed mechanism thereby constituting another power transmission path, and the third gear element is connected to the output shaft. More specifically, first and second rotation shafts are placed coaxially with the output shaft, the gear mechanism is provided between the first rotation shaft and the input shaft, and the first gear element is mounted on the first rotation shaft. Further, the belt variable speed mechanism is provided between the second rotation shaft and the input shaft, and the second gear element is mounted on the second rotation shaft. By changing the rotational speed of the gear element connected to the belt variable speed mechanism while rotating the gear element connected to the gear mechanism at a constant rate, the rotational speed of the output shaft is changed or the rotational direction of the output shaft is changed.
In the continuously variable speed transmission having the differential gear mechanism such as the above-mentioned planetary gear mechanism, when the output shaft is rotated from rest, the power transmission path is divided into a driving power transmission path and an inverse power transmission path between the gear mechanism and the belt variable speed mechanism. In other words, when one path becomes a driving power transmission path, the other becomes an inverse power transmission path. Which becomes the driving power transmission path or the inverse power transmission path depends upon the difference in circumferential speeds between the gear element connected to the gear mechanism and the gear element connected to the belt variable speed mechanism. The path including the gear element having a larger circumferential speed becomes the driving power transmission path. Since driving power and inverse power arise as power, power obtained by subtracting the i
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patent: 4838834 (1989-06-01), Miyata
patent: 5167591 (1992-12-01), Cowan
patent: 5848949 (1998-12-01), Miyata et al.
Bando Chemical Industries Ltd.
Bucci David A.
Charles Marcus
Cole Thomas W.
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