JP2528572Y2 - Wet multi-plate friction engagement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION This invention relates to a wet multi-plate friction engagement device such as a wet multi-plate clutch and a wet multi-plate brake, and is used in a continuous sliding state such as a friction clutch for a transfer of a four-wheel drive vehicle. It can also be used for devices that are used.

2. Description of the Related Art As a wet multi-plate friction engagement device, there is, for example, a device as shown in FIG.

In the figure, reference numeral 6 denotes an input shaft, 5 denotes a clutch gear, which constitutes a drive side member, 51 denotes a spline portion formed in the clutch gear, and 7 denotes a pressing piston.

4 is a clutch drum as a passive member,
41 is the spline part.

1 is a passive plate fitted to the spline portion 41, 2 is a drive plate fitted to the spline portion 51, and 3 is a pressure plate. In the conventional device, as shown in FIG. 3 (b), the drive plate 2 has a wet friction material 8 stretched on both sides of a steel plate 9 '.
The passive plate 1 is constituted only by the steel plate 9.

By the way, the characteristics required of the clutch plate at present are very severe, and (1) heat resistance and durability (2)
High capacity (3) Low friction (small drag torque)
(4) Each condition for reducing the operation shock must be satisfied.

3 (a) showing the flow of heat in the passive plate 1 and FIG. 3 (b) shown in a side view.
Is engaged with the spline portion 41 of the clutch drum 4,
When the apparatus is in the engaged state, the frictional heat between the wet friction material 8 and the passive plate 1 is transmitted from the end e of the spline teeth 91 to the end face f of the spline 41 inside the clutch drum as shown by the arrow α.
The piston 7 side (FIG. 1) and the pressure plate 3
Although the passive plate 1 on the side has a large heat capacity and a low surface temperature,
As the frictional heat is accumulated in the center, the surface temperature increases.
Here, since the wet friction material 8 and the adhesive between the wet friction material 8 and the steel plate 9 'have a small heat transfer coefficient, the steel plate 9' of the drive plate 2 hardly contributes to heat conduction. Therefore, how large the heat capacity of the passive plate 1 per one surface of the wet friction material 8 can be set is a method of lowering the surface temperature, which is a point of improving heat resistance and durability.

As described above, in the conventional wet-type multi-plate friction engagement device, the surface temperature of the passive plate 1 greatly differs depending on the position due to the problem of heat conduction, and the partial burnout of the wet friction material 8 and the passive plate 1
Heat spot (partial transformation by heat) occurs in
Abnormal wear of the wet friction material 8 and the occurrence of peeling caused the deterioration of durability, which was inevitable.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a configuration in which the passive plate and the driving plate are formed of only steel plates, and independent friction is not fitted to the spline between the passive plate and the driving plate. It is configured so that a plate exists.

FIG. 2 is an explanatory view of the multi-plate friction engagement device of the present invention. The passive plate 1 is made of a steel plate 9 and has spline teeth 91 on the outer periphery. The drive plate 2 is also made of a steel plate 9 'and has spline teeth 91' on the inner periphery. And passive plate 1 and drive plate 2
There is an independent friction plate 10 that does not fit with the spline. FIG. 3 (c) is an explanatory diagram of the heat flow of the passive plate 1,
(D) is an explanatory view of the heat flow of the drive plate 2, and (e) is a side view, in which the steel plate 9 ′ and the friction plate 10 of the drive plate 2 are separated and independent so that the steel plate 9 ′ It can be used as a conduction path for frictional heat. FIG. 3 (c) shows that frictional heat flows from the spline teeth 91 of the passive plate 1 to the spline portion 4 of the clutch drum 4 as indicated by the arrow β.
(D) and (e) show that frictional heat also flows from the friction plate 10 to the drive plate 2 and, as also indicated by the arrow β, the spline of the clutch gear 5 starts from the end face e ′ of the spline teeth 91 ′ of the drive plate 2. The flow toward the end face f 'of the portion 51 is shown.

4A and 4B are explanatory views showing the state of temperature rise at the time of fastening. FIG. 4A is a cross-sectional view of a conventional device, and FIG. 4B shows the state of temperature rise. Since the adhesive with the steel plate 9 ′ has a small heat transfer coefficient, the frictional heat between the passive plate 1 and the friction plate 8 does not escape to the steel plate 9 ′ of the drive plate 2, so that the temperature rise on the side of the passive plate 1 is driven. It becomes larger than the plate 2 and the temperature distribution is not uniform. (C) shows a side cross section of the present invention, and (d) schematically shows that the temperature distribution becomes nearly uniform because the frictional heat flows to both the passive plate 1 and the driving plate 2 as described above. .

Embodiments FIGS. 5 to 16 show various embodiments of the friction plate 10, in which (a) is a side sectional view and (b) is an X-
The X sectional view is shown.

In the example shown in FIG. 5, the friction plate 10 has a core plate 11 between the wet friction materials 8 to increase the rigidity of the friction plate 10.

In the example of FIG. 6, the core plate 11 protrudes from the wet friction material 8 to enhance protection of the friction material. Also core plate 11
A notch 12 is provided to positively supply the friction material 8 with lubricating oil, and the shape of the notch 12 may be arbitrary.

In the example shown in FIG. 7, a through hole 15 is formed in the core plate 11 to improve the flow and retention of the lubricating oil inside the wet friction material 8. In this hole 15, the friction material 8 may exist as shown in FIG.

In the example shown in FIG. 8, an annular protective portion 13 is provided on the outer periphery of the wet friction material 8 to increase the rigidity of the friction plate 10 and the protection from the spline portion. The protective portion 13 may be a hard material different from the friction material 8, or may be partially increased in the density of the friction material 8 so as to be hard.

FIG. 9 is a modification of FIG. 8, in which the protection portion 13 is partially set.

FIGS. 10 and 11 show that the friction plate 10 made of a wet friction material is not a flat plate but has an inverted trapezoidal shape or a middle bulge type, respectively, for the purpose of reducing drag torque.

In the example shown in FIG. 12, the outer periphery of the friction plate 10 is constituted by separate wet friction materials 8, 8 'having different characteristics. For example, a friction plate having balanced characteristics can be obtained by using a wet friction material having a low friction coefficient on the outer peripheral side and a wet friction material having a high surface pressure resistance on the inner peripheral side.

In the example shown in FIG. 13, the fatigue life and durability can be improved by making the portion corresponding to the core plate a wet friction material 8 'having different characteristics. For example, by using a friction material 8 'having a high lubricating oil permeability in the core portion, lubricating oil can be supplied from both inside to the friction material on both surfaces, and heat resistance and durability are improved.

In the example of FIG. 14, an oil groove 14 is provided on the surface of the friction material 8 to improve heat resistance and durability. In the figure, it is provided parallel to the groove.

The one shown in FIG. 15 is the one shown in FIG. 14 in which the internal through hole 15 or the groove is provided,
The durability is further enhanced.

FIG. 16 shows an example in which the hole 16 does not penetrate as in the case of FIG. 14, but is a non-through hole or groove.

Effect The present invention is configured as described above, and the friction plate is provided independently of the passive plate and the driving plate without fitting the friction plate to the spline, so that frictional heat flows to both the passive plate and the driving plate. The temperature rise was made uniform and both the heat resistance and the durability of the wet friction agent were improved.

Furthermore, since the friction plate is independent of the passive plate and the drive plate, drag torque is less likely to be generated than in the conventional device, and a low friction effect can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a configuration of a wet multi-plate friction engagement device, FIG. 2 is an explanatory view of a configuration of a multi-plate friction device of the present invention, and FIG. 3 (a) is an explanatory view of heat flow in a passive plate. FIG. 3 (b) is an explanatory view of a conventional apparatus in a side sectional view, FIGS. 3 (c) and 3 (d) are explanatory views of heat flow of the apparatus of the present invention, and FIG. 4 (a) to 4 (d) are comparison diagrams of temperature rise between the conventional device and the device of the present invention, and FIGS. 5 to 16 are various embodiments of the structure of the friction plate. It is a figure which shows an example, (a) is a side sectional view and (b) has shown the XX direction sectional view of (a) in each figure. DESCRIPTION OF SYMBOLS 1... Passive plate 2... Drive plate 3... Pressure plate 4... Clutch drum 41... Spline 5... Clutch gear 51 51 Spline 6. Input shaft 7. , 8,8 '... wet friction material 9,9' ... steel plate, 91,91 '... spline teeth 10 ... independent friction plate

Claims (8)

(57) [Scope of request for utility model registration] The drive plate and the passive plate, which are spline-engaged with the drive side member and the passive side member, respectively, are formed only of steel plates, and are provided between the drive plate and the passive plate independently of the splines. A wet multi-plate friction engagement device, wherein a friction plate is present. 2. The wet multi-plate friction engagement device according to claim 1, wherein said friction plate has a structure in which a wet friction material is bonded to both surfaces of a thin steel plate or resin. 3. The wet multi-plate friction engagement device according to claim 1, wherein said friction plate comprises only a wet friction material. 4. The friction plate according to claim 1, wherein an inner periphery and an outer periphery of the wet friction material are annularly or partially protected by a metal, a resin, a high-density processing part, or the like. The wet multi-plate friction engagement device according to claim 1. 5. The wet multi-plate friction engagement device according to claim 1, wherein said friction plate has a non-flat cross section. 6. The wet multi-plate friction engagement device according to claim 1, wherein said friction plate is made of two or more types of wet friction materials having different characteristics. 7. The wet multi-plate frictional engagement device according to claim 1, wherein said friction plate has an oil groove on a surface and a lubrication hole inside. 8. A wet multi-plate friction engagement device according to claim 2, wherein a thin steel plate inside the friction plate has a hole or notch for lubricating a wet friction material.