Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1981-06-03
1984-02-28
Hershkovitz, Abraham
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
605471, 92165PR, 92166, F15B 910
Patent
active
044336144
ABSTRACT:
A highly durable and light-weighted vacuum type brake booster device including a booster shell, a booster piston axially slidably accommodated in the booster shell to divide the interior thereof into a first chamber communicating with a vacuum source and a second chamber adapted to be placed into selective communication through a control valve with the first chamber and the atmosphere, and an input rod operatively connected with the control valve for operating the latter to generate a pressure differential between the first and second chambers. The front and rear walls of the booster shell are connected with each other by means of tie rod(s) which extend(s) through the booster piston with a deformable seal member disposed therebetween. The booster piston is urged in a retracting direction by a return spring disposed in the first chamber. A retainer plate for supporting one end of the return spring abuts against the front wall of the booster shell to prevent the vacuum deformation thereof and is secured to the tie rod so that the resilient force of the spring is shared by the tie rod to avoid any excessive loading on the booster shell.
REFERENCES:
patent: 4256016 (1981-03-01), Thomas
patent: 4270353 (1981-06-01), Thomas
patent: 4325218 (1982-04-01), Weiler
patent: 4328738 (1982-05-01), Hamamatsu
patent: 4330996 (1982-05-01), Becht
patent: 4334459 (1982-06-01), Riedel
patent: 4339921 (1982-07-01), Schanz
Hachiro Nobuaki
Miyazaki Yoshihisa
Takeuchi Hiroo
Hershkovitz Abraham
Nissin Kogyo Kabushiki Kaisha
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