US 4,667,568 AGranted

Pull-type booster for vehicle

AssigneeNippon Air Brake Co., Ltd.

InventorHideyuki Morimoto

Life of this patent

Estimating the term…

Loading patent…

Abstract

A pull-type booster for a vehicle includes a main body having an internal space; a movable body including a head portion and a cylindrical portion formed integrally with the head portion, the head portion being arranged in the internal space and partitioning the internal space into a lower pressure chamber at one side and a control chamber at another side, and the cylindrical portion projecting from the main body at the other side; a through hole formed in the movable body; a pull input rod extending across the lower pressure chamber and projecting through a seal assembly from the main body at the one side; the seal assembly including a seal member fixed to the main body at its outer circumferential portion and fitted to the pull input rod at its inner circumferential portion; a more flexible portion formed between the outer circumferential portion and the inner circumferential portion in the seal member; a plunger arranged slidably in the through hole and combined with a head portion of the pull input rod; a valve member arranged in the through hole and operated by the plunger for generating pressure difference between the lower pressure chamber and the control chamber and moving the movable body in the direction of the lower pressure chamber; power transmission members arranged in an opening end portion of the through hole and engaged with the plunger means, and a pull output rod engaged with the power transmission member and projecting outwards from the cylindrical portion of the movable body.

Claims30

Dependent claims

A pull-type booster for a vehicle comprising:

(A) a main body having an internal space;
(B) a movable body including a head portion and a cylindrical portion formed intergrally with said head portion, said head portion being arranged in said internal space and partitioning said internal space into a lower pressure chamber at one side and a control chamber at another side, and said cylindrieal portion projecting from said main body at said other side;
(C) a through hole formed in said movable body;
(D) a pull input means extending across said low pressure chamber and projecting through a seal means from said main body at said one side;
(E) said seal means including a seal member fixed to said main body at its outer circumferential portion and fitted to said pull input means at its inner circumferential portion wherein a lip portion fitted to said pull input means is formed in said inner circumferential portion of said member;
(F) a slide ring slidably fitted to said pull input means, slidable on the outer surface of said main body and covered by said seal member;
(G) a more flexible portion formed betweet said outer circumferential portion and said inner circumferential portion in said seal member;
(H) a plunger means arranged slidably in said through hole and combined with a head portion of said pull input means;
(I) a valve means arranged in said through hole and operated by said plunger means for generating a pressure difference between said lower pressure chamber and said control chamber and moving said movable body in the direction of said lower pressure chamber;
(J) a power transmission means arrange in an opening end portion of said through hole and engaged with said plunger means;
and
(K) a pull output means engaged with said power transmission means and projecting outwards from said cylindrical portion of the movable body.

9 more elements

Dependencies are inferred from the claim text.