Creeper speed actuator for a tractor transmission

Details Creeper speed actuator for a tractor transmission Creeper speed actuator for a tractor transmission

1986-01-13

1987-11-17

Herrmann, Allan D.

Machine element or mechanism

Gearing

In series plural interchangeably locked nonplanetary units

74359, 192 363, B60K 4122, F16H 308

Patent

active

047065192

ABSTRACT:
A creeper speed mechanism includes a speed reduction gearset driven by an engine through selectively engaged, hydraulically actuated clutches, which are pressurized and vented alternately to produce a high speed ratio and a low speed ratio gear reduction between the engine and the creeper speed mechanism. A coupler connects alternately the creeper speed mechanism and the engine to the transmission input shaft in accordance with the position of a shift rail slidably mounted within the transmission casing. The hydraulic system that actuates the clutches pressurizes a cylinder and moves the shift rail and coupler to engage the creeper speed mechanism. A compression spring moves the coupler away from the creeper speed mechanism and toward engagement with the clutch output. The clutches are vented each time the coupler is moved to a neutral position out of engagement with the creeper speed mechanism and the clutch output.

REFERENCES:
patent: 2975656 (1961-03-01), Haverlander
patent: 3105395 (1963-10-01), Perkins
patent: 3422939 (1969-01-01), Biabaud
patent: 3897699 (1975-08-01), Hoyer
patent: 3916711 (1975-11-01), Hoyer
patent: 4068537 (1978-01-01), Wolfe
patent: 4273001 (1981-06-01), Miyahara et al.
patent: 4304155 (1981-12-01), Want et al.
patent: 4375172 (1983-03-01), Richards et al.
patent: 4440037 (1984-04-01), Foxton et al.
patent: 4498356 (1985-02-01), Vater et al.
patent: 4603596 (1986-08-01), Akashi et al.

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