Transmission

Patent metadata

Field	Value
Publication number	US-9291241-B2
Application number	US-201414258200-A
Country	US
Kind code	B2
Filing date	Apr 22, 2014
Priority date	Apr 22, 2014
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

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.

First claim

The invention claimed is:

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.

Assignees

• Kawasaki Heavy Ind Ltd

Inventors

• Itoo Seiji
• Hamada Ayumi
• Morita Taisuke

Classifications

• F16H1/02 Primary

  without gears having orbital motion · CPC title

• F16H1/08 Primary

  the members having helical, herringbone, or like teeth · CPC title

• F16H48/08

  comprising bevel gears · CPC title

• F16H2057/02086

  Measures for reducing size of gearbox, e.g. for creating a more compact transmission casing · CPC title

• F16H57/023

  Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly · CPC title