192 clutches and power-stop control – Elements – Engaging surfaces
Patent
1990-01-11
1991-10-01
Bonck, Rodney H.
192 clutches and power-stop control
Elements
Engaging surfaces
192107R, F16D 1364, F16D 6902, F16D 6904
Patent
active
050525360
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a clutch facing, e.g., used for a friction clutch of a vehicle, or the like.
2. Background Art
A conventional clutch facing of a clutch disc is generally produced by impregnating phenolic resin as a binding agent to non woven fabric such as asbestos or the like and by heating and pressing it. However, such conventional arrangement has the disadvantage that the clutch facing may not have enough durability to prevent a friction material from peeling or breaking away caused by circumferential burst force strongly applied on a friction surface during an operation.
To solve such problem, another arrangement as shown in FlG. 3 is also known. In the arrangement, a surface of a friction material 31 has bonded thereto an annular reinforcing plate 32 made of metal. However, in the foregoing arrangement, the reinforcing plate 32 must have sufficient thickness to prevent the friction material 31 from deforming, so that inertia torque applied on the clutch facing become too large. This causes the disadvantage that the shift operation of the transmission can not be carried out effectively.
To prevent such disadvantage, a further arrangement as shown in FIGS. 4 and 5 is also proposed in the Japanese Unexamined Patent Publication No. 61-70224. In the arrangement, an annular friction material 35 is integrally connected to a backup member 34. The backup member 34 has two pieces with an annular light metal net 33 molded concentrically therebetween. Each piece of the backup member 34 is produced by adding elastic materials e.g. rubber to a chopped stranded mat made of glass fiber inpregnated phenolic resin.
However, in such arrangement, shrinkage of the friction material 35 differs from that of the backup member 34, so that differential shrinkage of the friction material 35 during the forming process causes deformation as shown by two dot line W of FIG. 5. Thus, the friction coefficient of the clutch facing at initial stage of use may be too low to engage the clutch.
Although the arrangement in FIGS. 4 and 5 has a connecting surface 36 on which is concentrically formed an annular rib 37, the rib 37 does not work very well as a reinforcing member which prevents the circumferential burst force applied on the friction surface.
Accordingly it is an object of the present invention to provide an improved clutch facing, overcoming the above mentioned disadvantage by preventing the growth of inertia and deformation of the clutch facing, in which a reinforcing member is connected to an opposite side of a friction surface.
DISCLOSURE OF THE INVENTION
In order to accomplish the above object, the present invention employs a clutch facing having an annular friction material. A reinforcing plate is integrally connected to the friction material, the reinforcing plate has substantially the same shrinkage as the friction material has. The reinforcing plate has a connecting surface on which are integrally formed an annular rib and radial ribs which cross the annular rib.
Selected shrinkage of the reinforcing plate and the annular and radial ribs prevent the friction material from deforming even in the producing situation.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a perspective exploded view of a clutch facing of the present invention.
FIG. 2 is a partial cross sectional view of a clutch facing of the invention.
FIG. 3 is a partial cross sectional view of a clutch facing of the conventional arrangement.
FIG. 4 is a plain view of another conventional arrangement.
FIG. 5 a sectional view taken along line of V--V of FIG. 4.
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIG. 1, an annular clutch facing 1 consists of a friction material 3 and a reinforce plate 4 which have, respectively, formed therein a central large diameter hole 2. The friction material 3 is produced e.g. by impregnating phenolic resin or the like to non woven fabric such as asbestos or glass fiber.
Reinforcing plate 4 may be formed of a material from the group consisting of a light metal such as aluminum or
REFERENCES:
patent: 2054210 (1936-09-01), Weisenburg
patent: 3037860 (1962-06-01), Masterson et al.
patent: 4416361 (1983-11-01), Suzuki et al.
patent: 4593070 (1986-06-01), Oyama et al.
patent: 4657951 (1987-04-01), Takarada et al.
Bonck Rodney H.
Kabushiki Kaisha Daikin Seisakusho
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