Hydrostatic transaxle and locking differential and brake therefo

Details Hydrostatic transaxle and locking differential and brake therefo Hydrostatic transaxle and locking differential and brake therefo

1985-08-26

1987-09-29

Look, Edward K.

Power plants

Pressure fluid source and motor

Having plural energy outputs

74665T, 74687, 180308, 192 20, 192 35, F16D 3102

Patent

active

046961640

ABSTRACT:
A hydrostatic transaxle assembly T is disclosed including a pump (11), a manifold portion (13), and right and left motor axle assemblies (15 and 17). Each of the motor axle assemblies includes a radial ball motor (41), the output of which is the input to a gear reduction section (53). Each gear reduction section (53) includes primary and secondary planetary gear sets (55) and (57) including a planet carrier (79) driving the respective axle shaft. The transaxle assembly T includes a locking differential and parking brake mechanism (87) which comprises an engagement mechanism (89) and an actuation mechanism (91). When the engagement mechanism (89) is disengaged, the motor assemblies (15) and (17) are free to operate at different speeds for normal differentiation. The actuation mechanism (91) can be actuated to either a locking differential mode (FIG. 8) or a parking brake mode (FIG. 9). In the locking differential mode, both of the planet carriers (79) are free to turn, but must turn at the same speed of rotation. In the parking brake mode, both of the planet carriers (79) are prevented from rotating by the lock gears (93) and (101).

REFERENCES:
patent: 2424942 (1947-07-01), Mynssen
patent: 2874790 (1959-02-01), Hennessey
patent: 2978929 (1961-04-01), Roberts
patent: 3474689 (1969-10-01), Young
patent: 3538790 (1970-11-01), Polak
patent: 3751924 (1973-08-01), Brown et al.
patent: 3814222 (1974-06-01), Koivunen
patent: 3994354 (1976-11-01), Haumaier
patent: 4031780 (1977-06-01), Dolan et al.

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