A vehicle-use transmission includes: an input shaft into which a driving force from an engine is inputted; a power extraction shaft for transmitting the driving force of the input shaft to front wheels; a transmission mechanism for transmitting the driving force of the input shaft to rear wheels; and a rear-wheel intermediate shaft provided in a power transmission path between the power extraction shaft and the transmission mechanism. The rear-wheel intermediate shaft transmits the driving force through a helical gear attached to the rear-wheel intermediate shaft. Further, the rear-wheel intermediate shaft is supported by tapered roller bearings.
1. A vehicle-use transmission comprising:
an input shaft into which a driving force from an engine is inputted;
a power extraction shaft for transmitting the driving force of the input shaft to front wheels;
a transmission mechanism for transmitting the driving force of the input shaft to rear wheels;
a rear-wheel intermediate shaft in a power transmission path between the power extraction shaft and the transmission mechanism, the rear-wheel intermediate shaft being configured to transmit the driving force through a helical gear attached to the rear-wheel intermediate shaft; and
tapered roller bearings for supporting the rear-wheel intermediate shaft, each of the tapered roller bearings including:
an outer race abutting against a transmission case of the transmission;
an inner race abutting against the rear-wheel intermediate shaft; and
rollers revolving and located between the outer race and the inner race;
wherein each of the tapered roller bearings is configured such that an imaginary extension of a raceway surface of the outer race, an imaginary extension of a raceway surface of the inner race, and a vertex of an imaginary cone formed by the respective rollers intersects with each other at one intersection point on an imaginary longitudinal centerline of the rear-wheel intermediate shaft; and
wherein each of the tapered roller bearings is configured such that the intersection point of each of the roller bearings is located outside of the rear-wheel intermediate shaft and beyond a shaft end closest to the respective one of the roller bearings.
2. The transmission according to claim 1 , wherein:
the tapered roller bearings are provided on opposite sides of the helical gear in the form of a pair, and
between the helical gear and one of the tapered roller bearings located closest to the helical gear, an elastic member abuts against the helical gear, and a collar abuts against the elastic member and the one of the tapered roller bearings such that the tapered roller bearings are precompression-adjusted by the elastic member.
3. The transmission according to claim 2 , wherein the elastic member includes a dish spring.
4. The transmission according to claim 1 , wherein a transmission case of the transmission is formed of a right case portion and a left case portion divided apart from the right case portion.
5. A vehicle-use transmission comprising:
an input shaft into which a driving force from an engine is inputted;
a power extraction shaft for transmitting the driving force of the input shaft to front wheels;
a transmission mechanism for transmitting the driving force of the input shaft to rear wheels;
a rear-wheel intermediate shaft in a power transmission path between the power extraction shaft and the transmission mechanism, the rear-wheel intermediate shaft being configured to transmit the driving force through a helical gear attached to the rear-wheel intermediate shaft; and
tapered roller bearings for supporting the rear-wheel intermediate shaft, each of the tapered roller bearings including:
an outer race abutting against a transmission case of the transmission;
an inner race abutting against the rear-wheel intermediate shaft; and
rollers revolving and located between the outer race and the inner race;
wherein each of the tapered roller bearings is configured such that a vertex of an imaginary cone formed by each respective roller is on an imaginary longitudinal centerline of the rear-wheel intermediate shaft at an intersection point located outside of the rear-wheel intermediate shaft and beyond a shaft end closest to the respective one of the roller bearings.
6. The transmission according to claim 5 , wherein:
the tapered roller bearings are provided on opposite sides of the helical gear in the form of a pair, and
between the helical gear and one of the tapered roller bearings located closest to the helical gear, an elastic member abuts against the helical gear, and a collar abuts against the elastic member and the one of the tapered roller bearings such that the tapered roller bearings are precompression-adjusted by the elastic member.
7. The transmission according to claim 6 , wherein the elastic member includes a dish spring.
8. The transmission according to claim 5 , wherein a transmission case of the transmission is formed of a right case portion and a left case portion divided apart from the right case portion.