Friction gear transmission systems or components – Stepless ratio change – Intermediate idler between driving and driven gears
Reexamination Certificate
1999-03-17
2001-01-16
Marmor, Charles A (Department: 3681)
Friction gear transmission systems or components
Stepless ratio change
Intermediate idler between driving and driven gears
C475S193000, C074S60600R
Reexamination Certificate
active
06174260
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a continuously variable transmission for outputting rotation of a rotating input shaft inputted with an engine drive force as a continuously variable transmission and more particularly relates to a drive input structure for inputting drive force to the continuously variable transmission.
2. Description of Background Art
Continuously variable transmissions that continuously vary speed by continuously changing a position of contact of a rotating transmission member along a generating line of a variably rotating member formed in a cone shape are well known, as disclosed in, for example, Japanese Patent Laid-open Publications Hei. 9-177919, Hei. 9-177920 and Hei. 9-236161. The aforementioned continuously variable transmissions of the related art input engine driving force to a main transmission shaft by having a driven gear provided at a main transmission shaft face a window hole formed in a carrier (cone holder) and having a driven gear provided at a crank shaft mesh with the driven gear.
If the driven gear provided at the main transmission shaft is housed within the carrier, the carrier cannot be made small and the continuously variable transmission therefore becomes large. Further, the external diameter of the driven gear cannot be freely changed and it is therefore difficult to freely set the transmission ratio of the driving force transmitted from the engine to the continuously variable transmission.
SUMMARY AND OBJECTS OF THE INVENTION
As the present invention sets out to resolve the aforementioned situation, it is the object of the present invention to provide a continuously variable transmission that can be made small where a transmission ratio of a driving force transmitted from an engine can be freely set.
In order to achieve the above object, there is provided a continuously variable transmission drive input structure for housing a continuously variable transmission for outputting rotations of a rotating input shaft to a transmission chamber enclosing lubricating oil and defined in a crank chamber of an engine as an independent space, wherein a drive force transmitting member for transmitting drive force of the engine to the continuously variable transmission is provided at said rotating input shaft protruding outwards from said transmission chamber.
According to the above configuration, the drive force transmission member for inputting drive force of the engine to the rotating input axis of the continuously variable transmission is provided with a main transmission shaft protruding outwards from the transmission chamber housing the continuously variable transmission and a situation where the dimensions of the continuously variable transmission and the transmission chamber have to be made large because of the drive force transmission member can be prevented. Further, as the continuously variable transmission is housed in a transmission chamber where the crank chamber is independently defined, the lubrication system for the continuously variable transmission is separated from the engine lubrication system and stable lubrication can therefore be achieved without affecting the continuously variable transmission.
In addition, according to the present invention a centrifugal governor is provided for controlling the transmission ratio of the continuously variable transmission and is housed within the transmission chamber.
According to the above configuration, the transmission ratio of the continuously variable transmission can be automatically changed by the centrifugal governor and the continuously variable transmission can be made small by integrally forming the centrifugal governor.
In addition, the present invention provides for the driving force transmission member to be constructed as a gear.
According to the above configuration, by constructing the drive force transmitting member for transmitting the drive force of the engine to the rotating axis as a gear, the transmission ratio of the driving force transmitted to the continuously variable transmission can be freely set just by changing the external diameter of this gear.
In addition, the present invention provides that the portion of the rotating input shaft projecting outwardly from said transmission chamber is sealed using a sealing member.
According to the above configuration, the leaking of lubricating oil enclosed in the transmission chamber to the crank chamber is prevented by sealing the outer periphery of the rotating input shaft with a sealing member.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
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patent: 523462 (1955-04-01), None
patent: 8-247245 (1996-09-01), None
patent: 9177919 (1997-07-01), None
patent: 9177920 (1997-07-01), None
patent: 9236161 (1997-09-01), None
Nakamura Kazuhiko
Tsukada Yoshiaki
Birch & Stewart Kolasch & Birch, LLP
Honda Giken Kogyo Kabushiki Kaisha
Marmor Charles A
Parekh Ankur
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