Integral casted labrynth ring for brake drum
First Claim
1. A brake drum for a motor vehicle comprising:
- a center disk portion for mounting said drum to said motor vehicle,a cylindrical side portion joining said center disk portion to define an inside cylindrical braking surface and a closed end and an open end surrounded by a rim, andan annular ring insert having a radial wall and first and second cylindrical walls joining said radial wall, said ring imbedded within said cylindrical side portion to form a bottom and side surface of a labrynth groove within said rim facing said open end.
5 Assignments
0 Petitions
Accused Products
Abstract
A composite brake drum for motor vehicle applications incorporating an embedded annular ring insert. The annular ring is positioned within a casting cavity to define the surfaces of a labrynth groove at the open rim of the brake drum. The labrynth groove defines a region for a backing plate flange to define a labrynth seal to prevent entry of debris into the brake drum. By defining the labrynth groove using an annular ring inserted within the mold, the post-casting machining requirements are significantly reduced. Moreover, the presence of a steel ring in the rim of the brake drum provides structural benefits. The annular ring further preferably incorporates locating features to assure accurate positioning within the casting mold cavity.
64 Citations
15 Claims
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1. A brake drum for a motor vehicle comprising:
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a center disk portion for mounting said drum to said motor vehicle, a cylindrical side portion joining said center disk portion to define an inside cylindrical braking surface and a closed end and an open end surrounded by a rim, and an annular ring insert having a radial wall and first and second cylindrical walls joining said radial wall, said ring imbedded within said cylindrical side portion to form a bottom and side surface of a labrynth groove within said rim facing said open end. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An insert for incorporation into a brake drum of the type having a center disk portion for mounting said drum to a motor vehicle and having a cylindrical side portion joining said center disk portion to define an inside cylindrical braking surface and a closed end and an open end surrounded by a rim, said insert comprising:
an annular ring having a radial wall and first and second cylindrical walls joining said radial wall, said walls having a generally constant thickness being formed from a deformable sheet stock material. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A brake drum for a motor vehicle made by a process comprising the steps of:
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providing casting mold halves defining a mold cavity for forming said brake drum defining a center disk portion for mounting said drum to said motor vehicle and a cylindrical side portion joining said center disk portion to define an inside cylindrical braking surface, said cylindrical side portion joining said center disk portion to define a closed end and further having an open end surrounded by a rim, providing an insert in the form of an annular ring having a radial wall and first and second cylindrical walls joining said radial wall, placing said insert into said mold cavity in a position for at least partially defining said rim such that said insert walls define the bottom and side surfaces of a labrynth groove opening laterally relative to said drum, pouring molten iron into said mold cavity thereby imbedding said insert and forming said brake drum, and removing said brake drum from said mold cavity. - View Dependent Claims (14, 15)
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Specification