Procedure for setting the dead travel of a servo-motor for Assis

Details Procedure for setting the dead travel of a servo-motor for Assis Procedure for setting the dead travel of a servo-motor for Assis

1988-08-05

1990-06-19

Garrett, Robert E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91376R, 91471, F15B 910

Patent

active

049342495

ABSTRACT:
The setting of the dead travel of a servo-motor for assistance during braking is carried out in the factory during its assembly. For this purpose, a subassembly (68) comprising the piston (20), the operating pushrod (30) and its plunger (28), the valve head (34), the springs (38, 40) and the fixed (44) and tilting (50) keys, is placed in a setting sleeve (70). A load (F1) is exerted on the front face of the piston (20) sufficient to maintain a bearing surface (20b) permanently against a reference surface (70a) formed on the sleeve, and the pushrod (30) is freed from the action of the spring (40) by means of a fork (70a) formed on the sleeve, and the pushrod (30) is freed from the action of the spring (40) by means of a fork (72), after having pushed the plunger (28) up against the valve head (34) by applying a load (F3), the movement (.DELTA.) made by the mobile key (50) is measured between the reference surface (170a) and a shoulder formed on the plunger (28). A stop is then calibrated by giving it a length equal to the movement (.DELTA.) measured, less the dead travel desired and this calibrated stop is fixed at the end of the mobile key (50).

REFERENCES:
patent: 4545206 (1985-10-01), Kobayashi
patent: 4577548 (1985-03-01), Gautier
patent: 4594937 (1986-06-01), Meynier
patent: 4817500 (1989-04-01), Gautier

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