Brakes – With condition indicator – Wear
Patent
1997-01-24
1998-09-01
Oberleitner, Robert J.
Brakes
With condition indicator
Wear
188250B, F16D 6600
Patent
active
057997543
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to indelibly marking brake linings for drum brakes or for disk brakes.
BACKGROUND
At present, friction linings for drum brakes are marked either by ink jet marking directly on the lining or on a colour background previously deposited on the lining, or by marking using a transfer, or else by indentation by pressing a punch against the lining, in which case if it is desired for the marking to be coloured, a colour deposit film may be placed between the punch and the brake lining.
Marking is performed either on the edge of the brake lining or else on its concave back face which is subsequently in contact with the brake lining support member in the caliper of the drum brake.
Such marking serves to identify a new friction lining, but it cannot guarantee that a friction lining will continue to be identifiable throughout its lifetime, and in particular it cannot guarantee that the origin of a used lining can be determined.
The present invention also relates to marking single-block brake pads which do not include a metal support member on which the friction lining is secured.
FR-A-2,441,100 relates to such a brake pad made by moulding a preform for the support member out of organic material and a preform for the brake lining, and in which a metal reinforcing member is incorporated in the support member. That document represents the state of the art closest to the present invention. However, in that document the function of the reinforcing member is to stiffen the support member which is made of organic material.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a unique, unfalsifiable identification for a friction brake lining, or for a single-block brake pad, which identification lasts throughout the lifetime of the lining or pad, including after a possible accident.
According to the invention, this object is achieved by the fact that the friction lining includes, in an unused portion thereof, an insert that is not oxidisable and that withstands temperatures greater than 200.degree. C., said insert having a surface that is visible from outside the pad and that is suitable for serving as a medium for carrying indelible information.
With a single-block brake pad, the insert is located in the rear portion of the pad which performs the support member or backplate function. The insert is then advantageously in the form of a tongue located on the back of the brake pad and projecting towards the top of the brake caliper. The tongue enables the pad to be extracted when worn out.
A particularly preferred insert material is stainless steel, although other materials such as brass may be used.
Other advantages and characteristics of the invention will be apparent from the following description given by way of example with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a single-block pad for a disk brake and fitted with an insert of the invention,
FIG. 2 is a view of the friction face of the brake pad of FIG. 1,
FIG. 3 is an end view of the FIG. 1 brake pad,
FIG. 4 is a plan view of the FIG. 1 brake pad,
FIG. 5 shows a method of positioning inserts on a trough-shaped preform,
FIG. 6 shows another method of positioning inserts on a friction lining preform,
FIG. 7 shows a variant of the FIG. 5 method; and
FIGS. 8 and 9 show a method of fixing an insert on a friction lining for a drum brake while said lining is being machined.
DETAILED DESCRIPTION OF THE DRAWINGS
FIG. 1 to 4 show a single-block brake pad 1 made by moulding material in the form of a uniform powder mixture, the pad has at friction front face 2 designed to co-operate with a rotary part forming a portion of a brake, and a rear face 3 co-operating with a caliper.
The front portion 4 of the pad 1 acts as a brake lining that is worn down by the rotary part, while the rear portion 5 acts as a support member co-operating with the caliper to take up the braking torque. A stainless steel insert 6 is secured to the rear portion 5 of
REFERENCES:
patent: 3533491 (1970-10-01), Svenson
patent: 4356897 (1982-11-01), Urban
patent: 4658936 (1987-04-01), Moseley
patent: 5228541 (1993-07-01), Plude
patent: 5511636 (1996-04-01), Tanaka
Caron Jean-Pierre N.
Kazuro Jean M.
Ferodo Abex SA
Oberleitner Robert J.
Schwartz Chris
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