JPH0754671Y2 - Wet friction plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a friction plate used for a wet multi-plate clutch, a wet multi-plate brake, or the like.

Conventional technology For example, wet multi-plate clutches and wet multi-plate brakes used in automatic transmissions are annular metal plates (plates) and plate materials in which a lining material made of paper or the like is attached to the surface of the annular metal plate ( And) are alternately arranged, and by applying pressure to these to bring them into contact with each other, torque is transmitted by the frictional force between the two.
Lubricating oil is supplied for cooling and stabilizing the coefficient of friction.

In this type of wet friction plate, when the supply of lubricating oil is insufficient, the surface of the lining material is burned due to the heat generated due to the relative sliding between the disc and the plate, and the wear is accelerated accordingly, and the friction coefficient is increased. And the durability deteriorates. Therefore, various attempts have been made so far to sufficiently supply the lubricating oil. For example, in the wet multi-plate friction engagement device described in Japanese Patent Laid-Open No. 59-54825, the lubricating oil is applied even at the time of engagement. The separator plate is provided with a hole or groove for flowing the liquid.

However, since the lining material is compressed at the time of engagement and its density becomes high, even if the above-mentioned grooves and holes are formed, the lubricating oil is hardly supplied, especially in the axial dimension. If the disk or plate is made thin in order to increase the torque capacity without increasing the torque, it is not possible to secure the above-described open state of the groove or hole at the time of engagement. In the wet multi-plate clutch, when engaged in a high rotation state,
The lubricating oil contained in the lining material was scattered by the centrifugal force to cause oil shortage on the friction surface, which could cause seizure.

On the other hand, metal plates are generally manufactured to be as flat as possible, but inevitably there will be convex portions on the surface. Occasionally, heat generation at the convex portion becomes more remarkable than at other portions. This is called a heat spot, and there is a large amount of burning and thermal deformation at this portion, which causes uneven contact with the lining material of the mating material, which leads to early wear of the lining material and friction coefficient. Deterioration and deterioration of durability. Since such inconvenience is caused by the surface shape of the plate, it cannot be eliminated by forming the above-mentioned holes or grooves.

This invention was made in the background of the above circumstances,
There is no seizure or reduction in friction coefficient due to heat spots,
Moreover, it aims at providing the wet friction plate excellent in durability.

Means for Solving the Problems In order to achieve the above-mentioned object, a friction plate of the present invention is made of a metal, in which a lubricating liquid is supplied to a contact surface that is brought into pressure contact with a mating friction member that is pressed and deformed. The flat member is characterized in that its contact surface has a concave shape in which at least one edge portion is recessed in the other portion by 1 μm or more.

Action The friction plate of the present invention is brought into pressure contact with the mating friction material, and torque is transmitted by the frictional force generated between them. At the time of this pressure contact, the mating member is a friction member that elastically deforms in the pressing direction, whereas the plate of this invention is
Made of metal, such deformation does not occur. Therefore, at least at the beginning of the contact, the edge portion first comes into contact with the mating friction material, and the other portions are separated from the mating friction material to form a gap between them. Also, the plate of this device is
Since the lubricating liquid is supplied to the contact surface, the lubricating liquid is retained in the above-mentioned gap, and since this portion is depressed with respect to the mating friction material, heat generation due to local contact does not occur,
Therefore, generation of heat spots is avoided. In addition,
Even if the edge comes into contact with the mating material prior to other parts, that part does not become a heat spot because it is in contact with the open space, and as a result, there is no seizure or a reduction in the friction coefficient. , Durability is also improved.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a view showing a sectional shape of a friction plate 1 according to the present invention, and FIG. 1 is a sectional view taken along the line I--I in FIG. The friction plate 1 shown in these figures is a thin metal plate-like body having an annular shape as a whole, and a plurality of flanges 2 for fitting a casing (not shown) so as not to rotate are equidistantly arranged on the outer peripheral portion. As shown schematically in FIG. 3, the friction plate 1 is provided so as to project. A paper lining adhesive plate in which a lining material 4 mainly made of pulp, for example, is attached to the surface of an annular metal plate 3 is provided. 5 are alternately arranged, and they are pressed against each other to transmit torque by frictional force between them. As shown in FIG. 1, the surface of the friction plate 1, that is, the surfaces 6 and 7 facing the lining material 4, has outer peripheral edge portions 6a and 7a and inner peripheral edge portions 6b and 7b in the width direction. It is formed on a concave arc surface having predetermined radii R1 and R2 protruding in the axial direction with respect to the central portion (width direction when measured in the radial direction). The recess depths a1 and a2 are set to 1 μm or more. Further, the contact surfaces 6 and 7 are subjected to necessary surface treatments such as polishing and plating.

When the friction plate 1 is arranged as shown in FIG. 3 and brought into contact with the paper lining adhesive plate 5, in other words, when the friction plate 1 is assembled and engaged as a multi-plate clutch,
Since the edge portions 6a, 6b, 7a, 7b on both inner and outer peripheral surfaces come into contact with the lining material 4 prior to other portions, lubricating oil (not shown) is held between the contact surfaces of both. Since the contact surfaces 6 and 7 of the friction plate 1 are recessed as described above,
No heat spots occur. Therefore, with the configuration shown in FIGS. 1 and 2, it is possible to eliminate inconveniences such as burning, a reduction in friction coefficient associated therewith, and a reduction in durability.

Here, the reason why the above-mentioned depression depths a1 and a2 are set to 1 μm or more will be shown together with the results of experiments conducted to confirm the effect of the present invention.

Outer diameter 127 mm, inner diameter 105 mm, plate thickness 1.8 mm, material S
35CM was used, and a plurality of types were prepared, one having a flat contact surface, one having a concave arc shape and a depth of 1 μm or less, and one having a depth of 1 μm or more. Also, as a mating paper lining adhesive plate, the outer diameter is 126 m
m, inner diameter 105 mm, plate thickness 1.84 mm, material SD1777X with double parallel grooves formed on the surface were used.
SAE ^# 2 type tester was used as the tester, and four friction plates and three paper lining adhesive plates were set, respectively, inertia amount 1.0kg · cm · s ² , rotation speed 6500rpm, surface pressure 8kg. The engagement test was performed 2500 times at / cm ² .

The results of examining the local burning, that is, the occurrence of heat spots are as shown in FIG. That is, if the depression depth of the contact surface is shallower than 1 μm, the size and degree of occurrence of the heat spot become remarkable. On the contrary, if the depression depth is 1 μm or more, no heat spot occurs or if it occurs. Even so, the degree was low and small.

When the wear amount of the paper-lining adhesive plate of the mating member was measured, the wear amount was 0.11 mm or less when the recess depth was 1 μm or more, and the wear shape was not particularly recessed or the recess amount was less than 1 μm. If the amount of wear is
It becomes 0.17 mm or more, and with the friction plate according to this invention,
It has been found that the durability of the entire friction engagement device can be improved.

From the above results, in this invention, the recess depth of the contact surface of the friction plate with the mating member is set to 1 μm or more. This is a value that exceeds the conventional manufacturing error, and is a value that can reliably obtain the above-mentioned effects.

The present invention is not limited to the above-described embodiment, and the surface shape of the contact surface is, as long as at least one edge portion is dented in the other portion, and thus, for example, the fifth embodiment. As shown in the figure, the outer edge 6
The edges 6b, 7b on the inner peripheral side with respect to a, 7a may have a concave arc surface with the most depression, or, as shown in FIG. 6, the central portion in the width direction may have a cross-sectional shape. The shape may be linearly depressed. Further, the friction plate of the present invention can obtain the same effect when used in a friction engagement device in which the mating member is a plate other than the paper lining adhesive plate. Further, according to this invention, the surface contacting with the mating member is formed in a concave shape. Therefore, for the friction plates located on the outermost sides (both sides) in the arrayed state, only one surface may be formed in a concave shape.

EFFECTS OF THE INVENTION As is apparent from the above description, according to the friction plate of the present invention, the contact surface with the mating member has a concave shape in which the other portion is recessed with respect to the edge portion, and the depth of the recess is 1 μm
From the above, there is almost no occurrence of heat spots,
Therefore, if the friction plate of the present invention is used, it is possible to prevent local burning, a reduction in the friction coefficient due to it, or an early progress of wear including the mating material.

[Brief description of drawings]

FIG. 1 is a view showing a sectional shape of an embodiment of the present invention, which is a sectional view taken along the line I--I of FIG. 2, FIG. 2 is a front view showing the entire shape, and FIG. Sectional drawing which shows an example of the usage state of a friction plate in a schematic diagram, FIG. 4 is a figure which shows an experimental result, and is a line diagram which shows the relationship between a pit depth and the occurrence rate of a heat spot, FIG. 5, and FIG. Each is a sectional view showing a sectional shape of another example of the present invention. 1 ... Friction plate, 6, 7 ... Contact surface (of friction plate), 6
a, 6b, 7a, 7b ... edge part, a1, a2 ... pit depth.

Claims (1)

[Scope of utility model registration request] 1. A flat plate member made of a metal, to which a lubricating liquid is supplied to a contact surface which is brought into pressure contact with an opposing friction material that is pressed and deformed, the contact surface being at least one edge portion. On the other hand, the wet friction plate is characterized in that the other portion has a concave shape with a depression of 1 μm or more.