Patent EA-016180-B1 (EA)
Title: Bimetallic brake shoe with deep comb part
Inventor: TEMNIKOV FEDOR SERAFIMOVICH
IPC: B32B1/06
Filed: 2010-06-07
Abstract: The invention relates to railway transport, in particular to braking equipment used mainly in locomotives and railmotor cars. A comb bimetallic brake shoe with a deep comb part comprises a cast iron arch-shaped body consisting of main and profiled section with a groove made therein. The brake shoe comprises a steel frame with perforated mounting holes for fixing inserts. The brake shoe body is provided with friction elements in the form of cylindrical inserts. The inserts of the brake shoe profiled section are embedded into the brake shoe body from the side of friction surface and arranged by two groups separated by a section with no inserts therein. The inserts of the profiled section are embedded into a groove. The inserts are made of material whose abrasiveness is higher than the material of the brake shoe body, the inserts are spot welded to the steel frame. In the middle of a brake shoe a transverse boss is made on the rear side of a brake shoe with a hole for a wedge key. The brake shoe is made by casting cast iron into a mold. The main section of the brake shoe arch body is provided at the rear side with adjusting support T-shaped projections for coupling with the brake shoe and stiffening ribs connecting the main and profiled sections. The steel frame consists of two welded elements. The steel frame covers the main brake shoe section and embraces a transverse cast iron lug and has holes in the side surface at a level in the cast iron lug for the wedge key. The metal inserts are also from the side of friction surface perpendicular to the outer side groove wall of the profiled section. The inserts centers of the profiled section are arranged alternatively being equally distantly spaced from each other along the arch of the comb base of a wheel tread. The steel frame consists of two elements welded from two sides: an element of the main section frame and an element of the profiled section frame. The element of the profiled section frame is a rectangular-shaped in development with undercut low angles and 4-10 perforated longitudinal holes of different length arranged perpendicular to the brake shoe axis. The perforated holes do not reach edges by at least 15 mm for forming continuous closed contour belt of said element. The inserts in the groove wall are arranged in four levels starting from low end of a longitudinal hole biasing upwards by ½ diameter of an insert. The element of the profiled section frame reaches the outer surface of the groove side wall at a level comprising the middle height of the profiled section of the brake shoe body. The stiffening ribs are made as a steel joint plate. The groove of the profiled section has a depth exceeding the comb height of the wheel tread by 0.85-0.9 of thickness of the brake shoe main section. The inserts are made from steel or metals or alloys thereof. 14-24 inserts are provided into the body of the brake shoe main section and 4-12 inserts into the profiled section. The design of the inventive brake shoe provides to decrease a brake shoe weight, to balance a brake shoe due to more reliable profiled section enforced by a closed contour along its perimeter, to reduce rejects in the production process.