JPH0218841Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a peel-resistant paper facing that can be used in lock-up clutches for automobiles.

(Prior Art) Conventionally, for example, in a lock-up clutch for an automobile, a paper facing 3 is integrated with a piston 1 via an adhesive 2, as shown in FIG. The friction surface 4 of the paper facing 3 faces the inner surface of the input housing 5 which is integral with the impeller impeller of the torque converter, and the piston 1 is connected to the torsion spring 1.
6. Connected to a turbine impeller (not shown) in the torque converter via a spline hub 17. and torque converter input housing 5
In order to directly connect the turbine output shaft to the piston 1, hydraulic pressure is applied to the right side of the piston 1 to press the friction surface 4 of the paper facing 3 against the input housing 5. Thickness T of paper facing 3
It is usually about 1 mm thick and is made using paper-making techniques. Therefore, when such a paper facing 3 is bonded to the piston 1 via the adhesive 2, the bonded portion is strong, but the internal strength of the paper facing 3 is weak, and peeling resistance may occur with continued use. There is. That is, when the facing friction surface 4 comes into sliding contact with the opposing member under high surface pressure,
The friction surface 4 carbonizes to form a hard but brittle layer, and the thin surface layer (for example, thickness
0.1 mm) may come off (peel off) from the paper facing body along with a part of the material inside the paper facing 3 and fall off. When hard carbonized pieces of paper facing occur,
Not only will damage to the friction surface 4 be accelerated, but if such hard debris gets mixed into the hydraulic fluid of the torque converter, it is likely to cause malfunction of the hydraulic control valve and other control mechanisms.

(Purpose of the invention) The present invention focuses on the fact that the adhesive that adheres the paper facing to the piston 1 functions as a strong aggregate when hardened, and aims to improve the peeling resistance of the paper facing with the adhesive. It is an object.

(Structure of the invention) The invention is a paper facing that is integrated with adhesive to the output piston that is connected to and disconnected from the input housing of an automotive lock-up clutch. A lock-up clutch for an automobile, characterized in that a number of recesses reaching near the friction surface are provided on the surface so that the distribution density increases toward the outer periphery, and the recesses are filled with an adhesive that hardens after bonding. It is a removable paper facing.

(Example) The paper facing 3 in Fig. 1 is the friction surface 4.
A large number of annular grooves 6 having a V-shaped cross section are provided concentrically adjacent to each other on the opposite surface 7. The annular groove 6 is filled with adhesive 2, and this adhesive 2 firmly integrates the paper facing 3 and the piston 1, and the adhesive 2 in the annular groove 6 is filled with the paper facing 3. plays the role of aggregate. The thickness t of the paper facing layer on the side of the friction surface 4 not provided with the adhesive 2 is, for example, 0.1 mm, and the total thickness T of the paper facing 3 is, for example, 1.0 mm.
It is. The angle of the V shape of the annular groove 6 decreases toward the outer circumference of the facing, and therefore the distribution density of the adhesive 2 as an aggregate within a unit area of the paper facing 3 increases toward the outer circumference of the facing. ing. That is, the cross-sectional shape of the annular groove 6 is changed so that the reinforcing effect of the adhesive 2 increases toward the outer circumference of the facing.

FIG. 2 shows another embodiment, in which bottomed holes 8, for example 1 mm in diameter, are irregularly distributed on the adhesive surface 7 opposite the friction surface 4. In this case as well, the holes 8 are close to the friction surface 4 (for example, to t=0.1 mm), and the distribution density of the holes 8 is greater on the outer circumferential side of the facing. That is, a large number of holes 8 are provided on the outer peripheral side of the facing to increase the reinforcing effect of the facing.

When the action of connecting the clutch is repeated, the facing friction surface 4 comes into sliding contact with the mating member with high surface pressure.
Repeat pressure welding. During this time, the friction surface 4 carbonizes, becomes hard and brittle, and tries to peel off along with the material inside the facing body, but the adhesive 2 enters the facing body as aggregate and adheres to the material inside the facing body. Since the agent 2 penetrates and reinforces the facing from this side as well, peeling of the facing is effectively prevented. As the adhesive 2, for example, a phenol-based adhesive is used, so that when it hardens compared to the material of the paper facing 3, its strength increases, and even when the facing friction surface 4 receives an impact, the annular groove 6 and the bottomed hole 8 remain intact. The adhesive 2 suppresses local vibrations of the material of the paper facing 3, and the adhesive 2 in the recesses such as the annular groove 6 eventually reinforces the facing material near the friction surface 4, and also suppresses the vibration and strengthens the surface layer. It plays a role in preventing peeling.

(Effects of the Invention) As explained above, the present invention is a paper facing 3 that is integrated with an adhesive 2 to an output piston 1 that is connected to and disconnected from an input housing 5 of a lock-up clutch for an automobile. A large number of recesses reaching near the friction surface are provided on the surface of the paper facing 3 opposite to the friction surface 4 so that the distribution density increases toward the outer periphery, and the recesses are filled with an adhesive 2 that hardens after bonding. This is a peel-resistant paper facing for a lock-up clutch for an automobile, which is characterized by: Therefore, according to the present invention, not only the internal strength of the paper facing 3 is increased and the peeling resistance is greatly improved, but also the peeling resistance increases toward the outer periphery where the circumferential speed increases during rotation. Therefore, it has the advantage of reliably preventing peeling and falling off even when applied to lock-up clutches for automobiles that are repeatedly connected and disconnected under high-speed rotation conditions. In addition, the adhesive 2 penetrates into the surrounding material of the paper facing 3 and acts as an aggregate, improving the bonding strength between the adhesive 2 and the main body of the paper facing 3. This has the advantage of preventing peeling and destruction due to centrifugal force.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a paper facing according to the present invention, FIG. 2 is a longitudinal sectional view showing another embodiment, and FIG. 3 is a longitudinal sectional view showing a conventional structure. 1... Piston (holding member), 2... Adhesive,
3...Paper facing, 4...Friction surface, 6
...Annular groove (recess), 8...Bottomed hole (recess).

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A paper facing that is integrated with an adhesive to the output piston that is connected to and disconnected from the input housing of a lock-up clutch for an automobile, the friction surface of the paper facing and A lock-up for an automobile, characterized in that a number of recesses reaching near the friction surface are provided on the opposite surface so that the distribution density increases toward the outer circumference, and the recesses are filled with an adhesive that hardens after bonding. Clutch's peel-resistant paper facing. (2) A peel-resistant paper facing for a lock-up clutch for an automobile according to claim 1, wherein the concave portion is formed of an annular groove. (3) A peel-resistant paper facing for a lock-up clutch for an automobile according to claim 1 of the utility model registration claim, wherein the recess is a hole with a bottom.