US 10,518,759 B2 · Brake master cylinder with curved lands

Abstract

A brake master cylinder comprising a housing having an inner surface defining a bore, and a piston movable in the bore along a piston axis. The piston includes two spaced apart lands defining the radially outermost surfaces capable of contacting the inner surface. At least one of the lands is longitudinally curved at the radially outermost surface. For example, the land can be curved at a radius of less than 1 inch (e.g., between 0.15 inch and 0/75 inch) and preferably less than 0.5 inch. In one embodiment, the longitudinally curved land includes two edges that define an axial length of the land. The two edges have a radius of less than 0.2 inch, and preferably about 0.1 inch. The relative position of the edges and lands is such that neither of the two edges is capable of contacting the inner surface of the bore during reciprocating movement of the piston in the bore.

Claims20

Dependent claims

A brake master cylinder comprising:

a housing having an inner surface defining a bore;
and
a piston positioned in the bore and movable relative to the bore along a piston axis, the piston including two spaced apart lands defining the radially outermost surfaces capable of contacting the inner surface,
wherein at least one of the lands is longitudinally curved at the radially outermost surface,
wherein the at least one land has a width and is longitudinally curved at a radius, and
wherein the radius is larger than the width by a multiplier of 2.0 to 5.0.

3 more elements

Dependencies are inferred from the claim text.

Brake master cylinder with curved lands

Life of this patent

Brake master cylinder with curved lands

Life of this patent

Abstract

Claims20