JP3658168B2 - Wet friction member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an initial smoothing method for a wet friction member used for clutches, transmissions, and the like.
[0002]
[Prior art]
A ring-shaped friction member in which a lining having a high friction coefficient is pressure-bonded on both sides is used for a torque converter or a transmission. This friction member is transmitted with rotational force by the rotating lining surface being pressed against a disk or the like connected to the passive shaft. In other words, the friction coefficient value of the lining plays an important role in transmitting the rotational force from the friction member to the disk. For example, if the friction coefficient value is not constant, the rotational force is not transmitted well, and judder such as vibration and noise occurs. Therefore, as disclosed in Japanese Examined Patent Publication No. 6-37909, an initial leveling operation of a new friction member is performed at the manufacturing stage in order to keep the friction coefficient value constant.
[0003]
FIG. 5 shows an apparatus for performing this conventional initial leveling. The apparatus includes a cup-shaped case 110 having a substantially T-shaped support, a rotating shaft 114 rotatably supported by the case 110, a hub 107 connected to the rotating shaft 114, a hub 107, It is comprised from the pushing lid | cover 116 which opposes coaxially. A plurality of engaging grooves extending in the axial direction are provided on the outer peripheral surface of the hub 107. On the outer periphery of the hub 107, a plurality of protrusions that engage with the engaging grooves of the hub 107 are provided on the inner side, and a plurality of flat ring-shaped wet friction members 101 having linings formed on both planes are provided. It is inserted individually.
[0004]
A plurality of grooves are provided on the inner surface of the side wall of the case 110, and a plurality of ring-shaped discs 103 having protrusions engaging with the grooves on the outer peripheral surface are fitted into the case 110. . The wet friction member 101 and the disk 103 are alternately stacked.
Further, the case 110 is filled with hydraulic oil, and the push lid 116 is fitted into the upper opening of the case 110. Then, the disk 103 is pressed against the wet friction member 101 by the push lid 116, and the hub 107 is driven to rotate, so that the disk 103 and the wet friction member 101 rotate relative to each other while being in sliding contact. As a result, the surface of the friction material of the wet friction member 101 slides on the disk 103, and the surface of the friction material is slid. Thereby, the sliding surface of the friction material of the wet friction member 101 is made uniform, and the initial leveling is completed.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional initializing device, the wet friction member 101 and the disk 103 are incorporated in a device similar to an actual product device, and the wet friction member 101 has a considerable amount of friction until the desired friction property is achieved. It took time. As a result, production man-hours increased, production time delays, etc. occurred, and production costs could not be reduced.
[0006]
Then, this invention makes it a subject to provide the initializing method of the wet friction member which reduced the manufacturing cost by reduction of a manufacturing man-hour and shortening of manufacturing time.
[0007]
[Means for Solving the Problems]
An initial smoothing method for a wet friction member according to the present invention includes a rotating back plate fixed to a rotating shaft, a ring-shaped friction material having a paper base material bonded and fixed to at least one surface of the rotating back plate, An initial smoothing method for a wet friction member comprising : a flat surface for treating the friction surface of the friction material with pressure and frictional heat when the friction surface is rubbed, and a plurality of the friction surfaces formed on the flat surface and number of grooves, the polishing angle portion formed between the side surface of the flat surface and the groove by polishing using only grinding surface made, characterized in that the polishing surface.
[0008]
In the wet friction member, the friction surface of the friction material is rubbed with a polishing surface composed of a flat surface, a plurality of grooves, and polishing corners that treat the friction surface with pressure and frictional heat during friction. Therefore, the initial polishing can be performed quickly without excessive polishing.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The wet friction member is composed of a rotating back plate fixed to the rotating shaft and a ring-shaped friction material bonded and fixed on the rotating back plate. The rotating back plate is formed in a flat disk shape, for example, of steel or the like, and is fixed to a rotating shaft to which rotating power is transmitted.
[0010]
A flat ring-shaped friction material that is concentric with the center of the rotating back plate is joined and fixed on at least one surface of the rotating back plate. The friction material is made of paper as a base material and integrally impregnated with a friction coefficient adjusting agent, a binder and the like. This friction material is integrally joined to the rotating back plate. In this wet friction member, the friction surface of the friction material has a flat surface in which the friction surface is treated with pressure and frictional heat during friction, a plurality of grooves formed on the flat surface, the flat surface, and the flat surface. The polishing surface is polished by a polishing surface including a polishing corner formed between the side surfaces of the groove. The friction surface of the friction material comes into contact with the polishing surface and slides relative to the polishing surface to become a polishing surface.
[0011]
As a finishing device having a polished surface, a device having a rotating disk can be used. A polishing surface can be easily formed by forming a polishing surface on the surface of the rotating disk, abutting the friction surface of the friction material of the wet friction member on the polishing surface, and sliding relative to each other with a predetermined pressing force. The polished surface is formed between a flat surface that treats the friction surface with friction pressure and frictional heat, a plurality of grooves formed on the flat surface, and the flat surface and the side surface of the groove. And a polishing corner. Although the flat surface is in contact with the friction material and slides, the flat surface has very little polishing. Polishing is performed at the corner (polishing corner) between the flat surface and the groove. Increasing the amount of polishing can be achieved by increasing the number of grooves and by making the corners (polishing corners) acute.
[0012]
However, if there are too many grooves or the corners (polishing corners) are too acute, management of the processing operation becomes difficult. For this reason, it is preferable to determine the optimum groove amount and angle by trial and error. In addition, it is preferable that the groove has a lattice shape.
[0013]
[Operation and effect of the invention]
For example, the wet friction member is fixed to the rotating shaft of the leveling device and relatively rotated. Further, the polishing surface is fixed to a pedestal that moves up and down of the leveling device and pressed against the wet friction member. When the polishing surface is pressed against the wet friction member, the surface of the friction material and the polishing surface are rubbed, and the friction surface of the friction material is minimally polished at the edge portion of the top of the polishing surface, that is, the polishing corner.
[0014]
Further, the friction surface of the friction material is rubbed by the friction with the flat surface of the polishing surface and is treated by the pressure and generated heat. As a result, the friction characteristics of the friction surface of the friction material are stabilized, and the initial leveling is completed quickly.
In addition, since the top part (flat surface) of the polishing surface is formed flat, the friction surface of the friction material is not polished more than necessary.
[0015]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples. The external appearance of the wet friction member 1 is shown in FIG. 1, a plan view of a friction member jig 8 provided with a polishing surface 6 that slides on the wet friction member 1 is shown in FIG. 2, and the I-I 'direction in FIG. A sectional view of the friction member jig 8 is shown in FIG. 3, and a finishing device 16 to which the friction member jig 8 is attached is shown in FIG.
[0016]
As is apparent from FIG. 1, the wet friction member 1 includes a rotating back plate 2 formed in a flat ring shape, and a ring-shaped friction material 3 bonded to one surface of the rotating back plate 2. ing. The rotary back plate 2 is provided with a large-diameter through hole 5 in the central portion, and protrusions 4 are provided at equal intervals on the inner peripheral surface portion of the through hole 5. Further, a flat and ring-shaped friction material 3 is bonded and fixed on one plate surface of the rotary back plate 2. The friction material 3 is an ordinary wet friction material using paper as a base material and phenol resin as a binder.
[0017]
2 and 3, the friction member jig 8 has a large-diameter through-hole 11 at the center, a shallow ring-shaped step on the outer peripheral side, and a ring-shaped polishing on the outer peripheral side. Surface 6 is formed. Six plate fixing bolt holes 9 are formed in the step portion at equal intervals and concentrically. The polishing surface 6 has a 2 mm wide groove 10 formed in a lattice pattern at an interval of 2 mm. Thereby the polishing surface 6 is formed between the top surface of the protrusions 7 of the flat square pole shape are arranged at a number of equally spaced (the flat surface), and a groove 10 in between, and the side surface of the top face and the groove It is formed with the polished corners . The polished surface 6 is subjected to a curing process.
[0018]
Next, the finishing device 16 to which the friction member jig 8 is attached will be described. As is apparent from FIG. 6, the finishing device 16 includes a concave case 20 having an opening in the upper portion, a support column 18 that fixes and supports the case 20, and a base 19 on which the support column 18 is erected in the center. A rotating shaft 21 that passes through the center of the support column 18, a disk-shaped mounting table 31 that has a hub 22 that is rotated by the rotating shaft 21 at the center, and a lid body 23 that seals the opening of the case 20; It is composed of a core rod 24 penetrating the vertical center of the lid 23 and a pedestal 25 fixed to the lower end of the core rod 24.
[0019]
At both ends of the base 19, legs 17 that support the entire finishing device 16 are provided, and a column 18 that supports the case 20 is erected at the center of the base 19. The upper part of the peripheral wall of the case 20 is provided with a recess into which the lid 23 is fitted, and the opening of the case 20 filled with hydraulic oil is closed by the lid 23. A rotating shaft 21 connected to a motor (not shown) is rotatably held at the center of the support 18 by two bearings 26. In addition, a plurality of oil seals 27 for preventing leakage of hydraulic oil in the case 20 are attached to the gap between the rotating shaft 21 and the support column 18.
[0020]
A plurality of grooves 30 are provided in the axial direction on the upper circumferential surface of the hub 22. The through hole 5 of the wet friction member 1 is fitted into the groove 30 and the wet friction member 1 is placed on the placement table 31. The friction member jig 8 is fixed with a plurality of bolts 28 to the bottom surface of the pedestal 25 fixed to the fishing rod by the core rod 24.
When the wet friction member 1 is mounted on the mounting table 31 and is fitted to the upper end of the hub 22, the opening of the case 20 filled with hydraulic oil is closed by the lid body 23. Thereafter, the wet friction member 1 is rotated, and the friction member jig 8 is pressed against the sliding surface (friction surface) of the wet friction member 1 by the core rod 24 so that the polishing surface 6 and the wet friction member 1 are rubbed. Is done. Note that the hydraulic oil poured into the case 20 is kept at a constant temperature by a cooler (radiator) (not shown).
[0021]
Moreover, the force applied to the core rod 24 is about 200 kgf to 500 kgf (weight kilogram), for example, about 300 kgf. Moreover, the wet friction member 1 was brought into sliding contact with the polishing surface 6 of the friction member jig 8 for about 20 seconds to 60 seconds while being rotated 600 times per minute.
When the polishing surface 6 of the friction member jig 8 is rubbed with the friction surface of the friction material 3, the friction surface of the friction material 3 is minimally polished by the polishing surface 6, and the top surface (flat surface) and the friction material are also polished. The friction surface of the friction material 3 is treated with heat generated by friction with the friction material 3. Thereby, the friction surface of the friction material 3 is polished. As a result, the friction characteristics of the friction material of the wet friction member 1 are stabilized, and the occurrence of judder or the like can be prevented. Thus, the initial leveling of the wet friction member 1 can be carried out quickly and separately, and the manufacturing time can be shortened and thus the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a wet friction member 1 used in an embodiment of the present invention.
FIG. 2 is a plan view of a friction member jig 8 used in Examples.
FIG. 3 is a cross-sectional view of a friction member jig 8 used in Examples.
FIG. 4 is a vertical sectional view of the finishing device 16 used in the example.
FIG. 5 is a vertical sectional view of a conventional finishing apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Wet friction member, 2 ... Rotary back plate, 3 ... Friction material, 5, 11 ... Through-hole, 6 ... Polishing surface, 7 ... Protrusion, 8 ... Jig for friction members, 10 ... Groove, 18 ... Strut, 19 ... base, 20 ... case, 23 ... lid, 25 ... pedestal.

Claims (2)

An initial smoothing method for a wet friction member comprising: a rotating back plate fixed to a rotating shaft; and a ring-shaped friction material based on paper bonded and fixed to at least one surface of the rotating back plate. ,
A flat surface for treating the friction surface of the friction material with pressure and frictional heat when the friction surface is rubbed, a plurality of grooves formed on the flat surface, the flat surface, and side surfaces of the grooves; An initial smoothing method for a wet friction member , characterized in that a polishing surface is obtained by polishing using only a polishing surface comprising a polishing corner portion formed between the two. The method for initializing a wet friction member according to claim 1, wherein the grooves are formed in a lattice shape.

Images