Vehicle transmission

Patent metadata

Field	Value
Publication number	US-9920816-B2
Application number	US-201514825770-A
Country	US
Kind code	B2
Filing date	Aug 13, 2015
Priority date	Aug 25, 2014
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

A transmission that reduces the difference of rotational speed when engaging a main shaft-side sprocket and a main shaft-outer shaft, in a low-speed traveling mode. When shifting from first gear to neutral in the transmission, a dog on a drive gear is engaged with a dog hole in a main shaft-side sprocket, engagement between a dog on a driven gear for first gear and a dog hole in a driven gear is released, and then a first clutch and a second clutch are disconnected with the drive gear and the main shaft-side sprocket being engaged.

First claim

What is claimed is:

1. A vehicle transmission comprising:
a main shaft provided with a train of a plurality of drive gears, and receiving input of rotation from an internal combustion engine;
a counter shaft provided with a train of a plurality of driven gears meshing with the train of said plurality of drive gears, and arranged parallel to said main shaft;
a main shaft-side sprocket provided on said main shaft so as to be rotatable relative thereto;
a counter shaft-side sprocket provided on said counter shaft so as to be rotatable relative thereto;
a reverse travel chain wound around said main shaft-side sprocket and said counter shaft-side sprocket;
a main shaft-inner shaft constituting said main shaft, and having said main shaft-side sprocket rotatable relative thereto;
a main shaft-outer shaft constituting said main shaft, arranged coaxially with and radially outward of said main shaft-inner shaft, and capable of rotating integrally with said main shaft-side sprocket or separating from said main shaft-side sprocket;
a first clutch connected to one end side of said main shaft-inner shaft; and
a second clutch connected to one end side of said main shaft-outer shaft, wherein:
said counter shaft-side sprocket is configured to rotate integrally with a driven gear for first gear, which is provided on said counter shaft so as to be rotatable relative thereto;
said vehicle transmission further comprises
a reverse dog clutch as a drive gear, whose one end side is capable of rotating integrally with or separating from said main shaft-side sprocket, and whose other end side is supported by said main shaft-outer shaft so as not to be rotatable relative thereto, and
a dog clutch for first gear, which is provided on said counter shaft and capable of engaging with said driven gear for first gear;

when said vehicle transmission shifts from first gear to neutral, said reverse dog clutch is engaged with said main shaft-side sprocket, and then engagement between said dog clutch for first gear and said driven gear for first gear is released; and
in said neutral, said first clutch and said second clutch are disconnected with said reverse dog clutch and said main shaft-side sprocket being engaged.

2. The vehicle transmission according to claim 1 , wherein:
a drive gear for second gear is provided on said main shaft-outer shaft, while a driven gear for second gear meshing with said drive gear for second gear is provided on said counter shaft;
said reverse dog clutch transmits drive power of said main shaft-inner shaft from said main shaft-side sprocket to said main shaft-outer shaft; and
said drive gear for second gear transmits said drive power to said counter shaft through said driven gear for second gear.

3. The vehicle transmission according claim 2 , wherein
a drive gear for first gear meshing with said driven gear for first gear is arranged adjacent to said main shaft-side sprocket, on said main shaft-inner shaft.

4. The vehicle transmission according to claim 3 , wherein
said counter shaft-side sprocket is formed integrally with said driven gear for first gear, and arranged on said counter shaft.

5. The vehicle transmission according to claim 2 , wherein
said counter shaft-side sprocket is formed integrally with said driven gear for first gear, and arranged on said counter shaft.

6. The vehicle transmission according claim 1 , wherein
a drive gear for first gear meshing with said driven gear for first gear is arranged adjacent to said main shaft-side sprocket, on said main shaft-inner shaft.

7. The vehicle transmission according to claim 6 , wherein
said counter shaft-side sprocket is formed integrally with said driven gear for first gear, and arranged on said counter shaft.

8. The vehicle transmission according to claim 1 , wherein
said counter shaft-side sprocket is formed integrally with said driven gear for first gear, and arranged on said counter shaft.

Assignees

• Honda Motor Co Ltd

Inventors

• Mizuno Kinya
• Fujimoto Yasushi
• Kittaka Eiji
• Makita Hiroyuki

Classifications

• F16H2200/0056

  the gear ratios comprising seven forward speeds · CPC title

• F16H2003/0822

  characterised by the arrangement of at least one reverse gear · CPC title

• F16H37/027

  toothed gearing combined with a gear using endless flexible members for reversing rotary motion only (F16H37/06 takes precedence) · CPC title

• F16H3/089

  all of the meshing gears being supported by a pair of parallel shafts, one being the input shaft and the other the output shaft, there being no countershaft involved · CPC title

• F16H3/006 Primary

  power being selectively transmitted by parallel flow paths, e.g. dual clutch transmissions · CPC title