JP2853495B2 - Cushion type friction clutch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction clutch device for an automobile in which a clutch disk is urged in an axial direction to a clutch disk as in a plate cushion type or a separate cushion type. The present invention relates to a friction clutch device for an automobile which can effectively prevent so-called judder.

[0002]

2. Description of the Related Art Conventionally, a clutch has been used for temporarily connecting and disconnecting power between an engine and a transmission. Such a clutch includes a friction clutch and a fluid clutch. Friction clutches, in particular, dry single-plate clutches having a relatively simple structure and capable of transmitting large power, are often used.

[0003] The basic structure of such a clutch will be briefly described with reference to FIG. 1. The drive side of the engine includes a flywheel 1, a clutch cover 2 fastened to the flywheel 1, and a release lever 3. Clutch cover 2
, A pressure plate 4 movably mounted in the axial direction, and a coil spring 5 is interposed between the pressure plate 4 and the clutch cover 2. On the other hand, a clutch disk 6 is disposed between the flywheel 1 and the pressure plate 4 as a driven side, and a hub center spline boss 6a of the clutch disk 6 is splined to an input shaft on the transmission side. With this configuration, the pressure plate 4 always presses the clutch disk 6 against the flywheel 1 by a spring force, and the frictional force can transmit the engine-side rotational force to the transmission via the clutch disk 6. When the clutch pedal 10 is depressed, the pressure plate 4 is separated from the flywheel 1 via the release fork 8, the release bearing 9, and the release lever 3, and the clutch can be released. In addition, there is a clutch using a diaphragm spring instead of the coil spring 5. In this case, the diaphragm also functions as the release lever 3.

[0004] The clutch disc 6 incorporated in the device is provided with a clutch hub 61 having a spline boss 6a at the center and a torsion spring 62 as shown in FIG.
1 and facings 64a, 64b disposed on both sides of the disk surface of the disk plate 63, and as shown in FIG.
Are riveted to the disk plate 63 between the facings 64a and 64b facing each other so that the facings 64a and 64b can be connected.
The buffer spring force can be biased in the axial direction between the surfaces b. 2B and FIG.
As shown in (A), a cushion spring 65 (action plate) is arranged on the outer peripheral side of the disk plate 63, and the cushion spring 65 is directly connected to the facing surfaces 64a, 64b.
Some are configured so that they can face each other. (These are referred to as separate cushion types.) It is to be noted that the disk plate itself is provided with a cushion spring function without taking the above-described configuration, and the facing 6
There is also a configuration in which a buffer spring force can be urged in the axial direction between the 4a and 64b surfaces (plate cushion type).

[0005]

In the above-mentioned device, the face surfaces are repeatedly pressed against each other via a cushion spring when the clutch is connected, and the pressure contact is pressed via frictional force. Friction heat is generated between the face surfaces. For this reason, the cushion spring is required to have a heat and pressure resistance enough to withstand such frictional heat and high load, but there is not necessarily a cushion spring that satisfies a desired purpose, and it is easy for sag to occur. When sagging occurs in the cushion spring, the facings 64a, 6a
A desired cushioning spring force cannot be obtained between the 4b surfaces, in other words, a smooth clutch connection cannot be performed, and the vehicle vibrates when the clutch is connected, that is, a so-called judder is generated.
Such a problem also occurs in a plate-cushion-type device in which a part of the disk plate is formed of a spring member.

In view of the drawbacks of the prior art, the present invention has a structure in which a part of the disk plate is constituted by a spring member, or a spring member is interposed in a part of the disk plate and a buffer spring is axially mounted on the clutch disk. It is an object of the present invention to provide a cushion-type friction clutch device in which a force is applied to a cushion-type friction clutch device which enables smooth clutch connection even after long-term use, thereby effectively preventing the above-mentioned judder. I do.

[0007]

The inventor of the present invention has found that the set of the cushion spring does not necessarily occur continuously for a long period of time, and the set is saturated after a predetermined time has elapsed and no change with time occurs thereafter. Was found. Accordingly, the present invention provides a method for substantially reducing frictional heat generated when the clutch disk is mounted in a clutch disk.
After performing a hot setting process at a temperature of 50 to 250 ° C. and applying a predetermined load and bending the spring member by a predetermined amount, the spring member is mounted in the clutch disc. .

In this case, it is preferable to apply a load corresponding to the maximum pressing load of the pressure plate to the clutch disk, which will be described later, during the hot setting. Further, the amount of deflection, in other words, the surface compression amount of the cushion spring after performing the hot setting process is 0.3 to
It is good to set to 1.5 mm.

[0009]

According to the above-mentioned technical means, since the heat set is generated in advance and the cushion spring saturated with the heat set is incorporated in the clutch disc 6, the spring is used not only in the initial operation but also for a long period of use. There is no room for settling, and smooth clutch connection is ensured, whereby the above-mentioned judder and the like can be effectively prevented. In addition, the present invention does not carry out the set removal by a running-in operation, but in a state in which the friction heat and the load at the time of clutch connection are continuously applied in the hot setting process, so that heat is removed in a short time. The jig holding the cushion spring at a predetermined pressure is only subjected to heat treatment in an electric furnace maintained at an ambient temperature of 150 to 250 ° C., so that a large amount of processing can be performed. According to the present invention, the surface compression amount of the cushion spring after the hot setting process is performed is set to 0.
By setting the thickness to 3 to 1.5 mm and attaching to the clutch, no judder was generated and no dragging of the clutch was generated.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples. Not just.

First, in the separate cushion type dry single-plate clutch shown in FIGS. 1 to 3, a leaf spring member made of spring steel (SK5M) having a thickness of 0.8 mm is formed in a wave shape, and is formed on the circumference of the disk plate. And eight cushion springs 65, and the amount of deflection (hereinafter referred to as surface compression) of the cushion spring 65 when the maximum pressing load of the pressure plate 4 against the clutch disc 6 is applied is 0.45 mm. 52mm, 0.62mm, 0.75
Field tests were conducted by mounting clutches each having a setting of mm on a truck and running the clutch 500 to 1000 km while repeatedly turning on and off the clutch several times / km.

When the relationship between the judder level and the surface compression amount was examined for the results of the field test, the results shown in FIG. 4 were obtained. FIG. 7A shows the relationship between the change in the pressing load of the pressure plate 4 before and after the running test and the amount of surface compression. As is clear from FIG. 7 (A), the amount of surface compression changes before and after the running test, and as is clear from FIG. In any case, when the surface compression amount was 0.3 mm or less, it was confirmed that judder was generated intuitively for the driver. Next, a clutch formed by setting the surface compression amount of the cushion spring 65 to a large value of 1.7 mm was mounted on a truck, and a field test similar to the above was performed. As a result, no judder was generated, but the clutch was disconnected. It became worse, and so-called dragging occurred. Therefore, the present inventor has performed a hot setting process on the cushion spring 65 in advance, and has performed the cushion spring 6 after the process.
5 is 0.45mm, 0.5mm, 0.6m
After mounting the clutches respectively set to m and 0.7 mm on the truck and performing the same on-site test as above, no judder was generated, and the surface compression after the end of the on-site test was also reduced to the initial value. There was almost no change from the surface compression amount. FIG. 7
As shown in (B), there was no change in the change in the pressing load of the pressure plate 4 before and after the running test and in the amount of surface compression.

Next, the hot setting process will be described in detail. FIG. 5 shows a cushion spring holding jig 20 for hot setting, in which a center cushion spring arrangement space is sandwiched between two rigid plates 21 arranged on both the upper and lower sides, a spacer 25 for setting a gap, and a compression coil spring. 24, the bolt nuts 22/23 are symmetrically arranged on both left and right sides. And,
For example, the surface compression amount of the cushion spring 65 becomes 0.5 mm.
A plurality of cushion springs 65 are arranged in the arrangement space in a state where the spacer 25 whose height is set so as to be interposed between the two rigid plates 21. By tightening the bolts and nuts 22/23 in this state, the cushion spring 65 is squeezed to the interval regulated by the spacer 25,
The load corresponding to the maximum pressing load of the pressure plate 4 against the clutch disk 6 is substantially the same as that of the cushion spring 65.
Will be applied. In this state, the jig holding the cushion spring 65 is inserted into an electric furnace,
A heat treatment is performed at a temperature of about 250 ° C. for a predetermined time.

FIG. 6 is a time-series distribution diagram showing a change in the heat treatment time and the cushion spring force. As can be understood from this figure, it can be understood that the change in the cushion spring force is stabilized and saturated when the heat treatment time passes for 15 minutes. Therefore, it can be understood that the heat treatment time can be set to 15 minutes or more, for example, about 20 minutes, so that the amount of heat sink can be easily removed in advance. Therefore, according to the present invention, by setting the surface compression amount of the cushion spring 65 after performing the hot setting process to 0.3 to 1.5 mm and mounting the cushion spring 65 on the clutch, no judder occurs and the clutch No dragging occurred. Although this embodiment has been described with reference to the separate cushion type embodiment, the present invention can be easily applied to a plate cushion type clutch device in which a part of a disk plate is formed by a spring member.

[0015]

As described above, according to the present invention, in a clutch device of a separate cushion type or a plate cushion type, a spring member for obtaining a cushioning spring force in an axial direction is subjected to hot setting in advance, so that it can be used for a long time. Smooth clutch connection is possible, and judder can be effectively prevented. And so on.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a dry single-plate clutch device applied to the present invention.

FIG. 2 is a clutch disc incorporated in the device.

FIGS. 3A and 3B are cross-sectional views showing an arrangement state of a cushion spring incorporated in the clutch disk, wherein FIG. 3A shows a state in which the cushion disk is riveted to the clutch disk, and FIG. .

FIG. 4 is a distribution diagram showing a relationship between a judder level and a surface compression amount.

FIG. 5 is a sectional view showing a jig for holding a cushion spring for hot setting.

FIG. 6 is a time-series distribution diagram showing a change in a heat treatment time and a cushion spring force.

FIGS. 7A and 7B show the relationship between the change in the pressing load of the pressure plate before and after the running test and the surface compression amount of the cushion spring; FIG.

[Explanation of symbols]

 65 Cushion spring 20 Processing jig for hot setting

Claims (3)

(57) [Claims] 1. A cushion type friction device in which a part of a disk plate is constituted by a spring member, or a spring member is interposed in a part of a disk plate to apply a cushioning spring force to a clutch disk in an axial direction. After applying a predetermined load to the spring member at a temperature of approximately 150 to 250 ° C. in advance and subjecting the spring member to a predetermined amount of bending in the clutch device, the spring member is moved to the clutch disk. Cushion type friction clutch device characterized by being mounted inside 2. The cushion type friction clutch device according to claim 1, wherein the predetermined load is set substantially corresponding to a maximum pressing load of the pressure plate against the clutch disk. 3. The cushion type friction clutch device according to claim 1, wherein the surface compression amount of the cushion spring after the hot set processing is set to 0.3 to 1.5 mm.