US 5,280,731 A · Constant-mesh transmission with a chain drive and double disconnect reverse

Abstract

The constant-mesh transmission includes a gear case, an input shaft, a counter shaft and an output shaft. An input drive gear integral with the input shaft meshes with the counter shaft drive gear. First, second and third speed counter shaft gears are integral with the counter shaft. A fifth speed counter shaft gear and a counter shaft sprocket are journaled on the counter shaft. First, second and third speed driven gears are journaled on the output shaft and in mesh with the first, second and third speed counter shaft gears. A reverse driven sprocket is journaled on the output shaft. A fifth speed output shaft gear is secured to the output shaft. A chain is trained around the sprockets. Clutch assemblies are mounted on the output shaft and a clutch is mounted on the counter shaft. A clutch locks gears to the output shaft for first and second speed. A clutch locks a gear to the output shaft for third speed or locks the input shaft to the output shaft for fourth speed. A clutch locks a gear to the counter shaft for fifth gear or locks a drive sprocket to the counter shaft. A clutch locks a driven sprocket to the output shaft. A shift fork simultaneously locks a sprocket to the counter shaft and locks a sprocket to the output shaft to drive the output shaft in a reverse direction from the input shaft rotation. Some of the clutches include synchronizers.

Claims15

Dependent claims

A transmission including a gear case;

a first shaft journaled in the gear case;
a first sprocket rotatably journaled on the first shaft and axially fixed relative to the first shaft;
a clutch mounted on the first shaft and operable to lock the first sprocket to the first shaft when engaged and to allow the first sprocket to rotate relative to the first shaft when disengaged;
a second shaft journaled in the gear case;
a second sprocket rotatably journaled on the second shaft and axially fixed relative to the second shaft;
a clutch mounted on the second shaft and operable to lock the second sprocket to the second shaft when engaged and to allow the second sprocket to rotate relative to the second shaft when disengaged;
and an endless belt trained around the first sprocket and the second sprocket which is disengaged from the first shaft and the second shaft when the clutch mounted on the first shaft and the clutch mounted on the second shaft are both disengaged.

4 more elements

A multi-ratio constant mesh transmission including a gear case;

an input shaft rotatably journaled in the gear case;
an output shaft rotatably journaled in the gear case;
a counter shaft mounted in the gear case and spaced from the input shaft and the output shaft;
an input drive gear secured to and integral with the input shaft and a counter shaft drive gear integral with the counter shaft and in mesh with the input drive gear;
a first ratio forward drive including a first ratio drive gear secured to the counter shaft, a first ratio driven gear journaled on the output shaft and in mesh with the first ratio drive gear secured to the counter shaft, and a first ratio clutch assembly mounted on the output shaft and operable to lock the first ratio driven gear to the output shaft when engaged and to allow the first ratio driven gear to rotate relative to the output shaft when the first ratio clutch assembly is disengaged;
and a reverse drive including a drive sprocket rotatably journaled on the counter shaft and axially fixed relative to the counter shaft, a driven sprocket journaled on the output shaft and axially fixed relative to the output shaft, a drive sprocket clutch mounted on the counter shaft and operable to lock the drive sprocket to the counter shaft when engaged, a driven sprocket clutch mounted on the output shaft and operable to lock the driven sprocket to the output shaft, and an endless chain trained around the drive sprocket and the driven sprocket.

3 more elements

Dependencies are inferred from the claim text.

Constant-mesh transmission with a chain drive and double disconnect reverse

Life of this patent

Constant-mesh transmission with a chain drive and double disconnect reverse

Life of this patent

Abstract

Claims15