US 6,470,791 B1Granted

Master cylinder

AssigneeLuK Lamellen und Kupplungsbau Beteiligungs KG

InventorsRoland Welter, Peter Schaaf, Peter Giese, Ludwig Winkelmann, Gerhard Meyer

Life of this patent

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Abstract

A master cylinder for the clutch or brake of a motor vehicle has a housing for a reciprocable piston one end of which receives the spherical head of a reciprocable piston rod. The head is held in a desired position relative to the piston by a one-piece or composite coupling device having a first section exerting a pull or bearing upon the head of the piston rod and a second section which is confined in or surrounds the end of the piston and urges the first section in a direction to hold the piston rod against axial movements relative to the piston. The coupling device and/or the piston are or can be made of a plastic material, and the connection between such parts is or can be established by snap action.

Claims9

Dependent claims

A master cylinder, comprising:

a housing defining a chamber;
a piston reciprocable in said chamber and having first and second ends;
a reciprocable piston rod including a spherical head extending into said chamber;
and
means for articulately coupling said head to one end of said piston, including a first section engaging said head and a second section affixed to said piston;
wherein said first section of said coupling means is a portion of a hollow sphere which surrounds and bears upon a portion of said head and has a central opening remote from said second section and surrounding a portion of said piston rod;
wherein said piston rod further includes an elongated part having an end connected with said head, said first section surrounding said head at said end of said elongated part and said second section including a tubular portion surrounding said one end of said piston;
wherein said one end of said piston has an external groove and said second section of said coupling means comprises at least one projection extending into said groove.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/579,094Filed 25 May 2000 · continuation
Priority: DE 197 52 07625 Nov 1997
Granted: 29 Oct 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B60T 11/165
Master control, e.g. master cylinders: single master cylinders for pressurised systems
B60T 11/18
Master control, e.g. master cylinders: connection thereof to initiating means
F16B 21/186
With circlips or like resilient retaining devices, i.e. resilient in the plane of the ring or the like; Details: external, i.e. with contracting…
F16D 25/08
Fluid-actuated clutches: with fluid-actuated member not rotating with a clutching member