Method for manufacturing frictional locking rings for stepped motor vehicle transmission synchronizing mechanisms
First Claim
1. A method for manufacturing frictional synchronizing rings for stepped motor vehicle transmissions, comprising the steps of:
- manufacturing a ring-shaped metallic base member having a rotational axis and a first conical surface thereabout;
depositing a frictional layer of a predetermined first thickness on said first conical surface, said layer being made of a sintering powder;
sintering said layer on said first conical surface;
providing a tool having a second conical surface complementary to said first conical surface;
applying said tool with said second conical surface on said first conical surface; and
pressing said tool against said base member to calibrate said sintered frictional layer to a predetermined second thickness less than said first thickness.
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Accused Products
Abstract
A method serves for manufacturing frictional locking rings, in particular for stepped motor vehicle transmission synchronizing mechanisms, in which a sintered frictional coating is applied on a surface of the element and the sintered frictional coating is compacted.
For simplifying the method and improving the reproducibility of the dimensions of the surface of the sintered frictional coating one first applies a frictional coating of a sintering powder in a predetermined raw dimension regarding its thickness and compacts the frictional coating thereafter under pressure to a predetermined nominal dimension.
18 Citations
9 Claims
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1. A method for manufacturing frictional synchronizing rings for stepped motor vehicle transmissions, comprising the steps of:
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manufacturing a ring-shaped metallic base member having a rotational axis and a first conical surface thereabout; depositing a frictional layer of a predetermined first thickness on said first conical surface, said layer being made of a sintering powder; sintering said layer on said first conical surface; providing a tool having a second conical surface complementary to said first conical surface; applying said tool with said second conical surface on said first conical surface; and pressing said tool against said base member to calibrate said sintered frictional layer to a predetermined second thickness less than said first thickness. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for manufacturing frictional synchronizing rings for stepped motor vehicle transmissions, comprising the steps of:
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manufacturing a ring-shaped metallic base member having a rotational axis and a first conical surface thereabout; depositing a frictional layer of a predetermined first thickness on said first conical surface, said layer being made of a sintering powder; sintering said layer on said first conical surface; and subjecting said base member with said layer thereon to a fluid pressure exerted in a manner to calibrate said layer to a decreased thickness.
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9. The method of claim 16, wherein said sintered layer is made of an open-pore structure and said subjecting step comprises first sealing said layer and then exposing same directly to the fluid pressure.
Specification