Wet friction material and manufacturing method therefor
AssigneeNsk-Warner Kabushiki Kaishi
InventorsShigeki Umezawa, Keisuke Torii
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Abstract
In a wet friction material and a method therefor of the present invention, an excessive binder coating on the outermost surface layer of the friction material is removed or prevented while at least one of impregnation, drying and setting of a binder, and further the surface of the friction material is smoothed by means of heating, pressurizing and molding.
Claims55
A wet friction material comprising a fibrous base material, a filler, a friction adjustment agent and a binder;
- wherein a ratio A/B is in the range of 0.85 to 1.15 where A is a binder concentration from a surface of said wet friction material to a depth of 10 μm and B is a binder concentration from a depth of 10 μm to a depth of 100 μm.
A method for manufacturing a wet friction material comprising the steps of:
- impregnating a raw paper comprising a fibrous material, a filler and a friction adjustment material with a binder;
- removing an excessive binder coating and a layer containing much binder, which are formed in an outermost surface layer during said impregnating step, by sucking means;
- drying said binder in said raw paper;
- setting said binder in said raw paper;
- and
- smoothing at least one surface of said raw paper.
A method for manufacturing a wet friction material comprising the steps of:
- impregnating a raw paper comprising a fibrous material, a filler and a friction adjustment material with a binder;
- preventing a formation of an excessive binder coating and a layer containing much binder, which are to be formed in an outermost surface layer during said impregnating step;
- drying said binder in said raw paper;
- setting said binder in said raw paper;
- and
- smoothing at least one surface of said raw paper.
A wet friction material comprising a fibrous base material, a filler, a friction adjustment agent and a binder;
- wherein an excessive binder coating and a layer containing much binder of said wet friction material are removed by sucking means while at least one of impregnating, drying and setting said binder.
A wet friction material comprising a fibrous base material, a filler, a friction adjustment agent and a binder wherein an excessive binder coating and a layer containing much binder on a surface of said wet friction material are prevented while at least one of impregnating, drying and setting said binder.
Dependencies are inferred from the claim text.