High-low braked gear drive
AssigneeCaterpillar Tractor Co.
InventorCharles H. Herr, Jr.
Life of this patent
Estimating the term…
Abstract
A power drive (10) for providing from a single speed range input drive motor (12) a dual speed range output and a braking function. The selective control of the output shaft (13) is effected through the use of only a brake and a clutch (27,28) under the control of pistons (33,40) and a biasing spring (38). The mechanism provides the desired control by suitable application of fluid pressure to associated piston chambers (34,41) thereby effecting different operating conditions and connections of the gearing (15,16,17,21,22) of the drive.
Claims7
In a power transmission system (10) having brake (27) and clutch means (28), improved means for selectively operating the clutch means comprising:
- a first fluid pressure-operated force-applying means (33,34);
- a second fluid pressure-operated force-applying means (40,41);
- spring means (38) biasing said brake and clutch means to an engaged condition;
- and
- force transfer means associated with said force-applying means (39) for causing alternatively (a) said brake means to be in the engaged condition and said clutch means to be in a released condition as a result of force being applied only by said first force-applying means, (b) said brake means to be in the released condition and said clutch means to be in the engaged condition as a result of forces applied by both said first and second force-applying means, or (c) said brake and clutch means concurrently to be in the engaged condition as a result of elimination of application of forces by the force-applying means.
Dependencies are inferred from the claim text.