JPH0564246B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a double plate clutch used in automobiles and the like.

<Prior Art> Multi-plate clutches, in which two clutch disks are arranged side by side with an intermediate plate interposed therebetween, are well known in large-sized automobiles and the like in order to increase the capacity of the clutch in a compact manner. In this type of multi-plate clutch, the torsional rigidity of the damper springs of both clutch disks are all the same, so the vibration frequencies generated by both frictions of the intermediate plates are the same and are amplified, causing abnormal noises in the drive system and when starting. Feeling was at a disadvantage. In order to solve this problem, it is known from Japanese Utility Model Publication No. 53-6760 that the spring constants of the damper springs of the two clutch disks are different from each other to change the torsional characteristics of both clutch disks.

<Problems to be Solved by the Invention> The prior art disclosed in Utility Model Publication No. 53-6760 is very effective in reducing abnormal noise in the drive system of a double-plate clutch. However, the problem is that the spline fitting of both clutch disks to the splined hub is a close fit in the direction of rotation, so the total torsion angle of both clutch disks is small, and the range for selecting the spring constant is narrow as a result. It is difficult to obtain the optimum spring constant in terms of sound and starting performance.

The present invention takes advantage of the above-mentioned conventional technical advantages and further improves them by increasing the total torsion angle, reducing abnormal noise, and
It is designed to provide an optimal spring constant to improve the feeling when starting.

<Means for Solving the Problems> In the present invention, the clutch disks are individually spline-fitted to the input shaft by means of spline hubs, and the clutch disks are disposed at the front and rear of the input shaft via an intermediate plate, and each clutch disk is In a double-plate clutch in which damper springs are provided with different spring constants, one of the clutch disks is tightly fitted in the rotational direction to the spline fitting portion, and the other clutch disk is fitted with a free movement gap in the rotational direction. A centering plate is provided between the two clutch disks to determine the rotational direction of the clutch disks, and the clutch disks are fitted with a floating gap formed in the rotational direction at the spline fitting portion. The spring force of the damper spring on the side is made stronger than the spring force of the damper spring on the side of the clutch disk, which is tightly fitted in the rotation direction to the spline fitting part, to reduce the return angle, and the spring force is tightly fitted in the rotation direction to the spline fitting part. This is characterized by softening the spring force of the damper spring on the side of the clutch disk that is engaged, thereby increasing the return angle.

<Function> According to the present invention, one of the clutch disks on the side in which the free movement gap in the rotational direction is formed in the spline fitting portion,
During idle motion in the gap, the damper of only the other clutch disk operates, resulting in a low spring constant, and the torsion angle of the other clutch disk with the smaller stopper torque is equal to that of the one with the larger stopper torque. This is larger than the torsion angle of the clutch disc, ensuring a large total torsion angle.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. In FIG. 1, 1 is a flywheel. 2 is an intermediate plate, and clutch disks 3a, 3 are connected to the front and rear of the intermediate plate 2 via the intermediate plate 2.
b is placed. This clutch disk 3
a and 3b are spline-fitted to the input shaft 5 through spline hubs 4a and 4b. Damper springs 9a and 9b are two-stage springs, and have different spring constants. 6 indicates a pressure plate.

In the present invention, in the above configuration, either one of the clutch disks 3a is configured as shown in FIG.
The spline fitting is performed with a gap θ in the rotational direction between the tooth width of the spline teeth 5a of the input shaft 5 and the groove width of the tooth grooves 10 of the spline hub 4a, and the other clutch disk 3b is shown in FIG. As shown, the spline hub 4b and the spline teeth of the input shaft 5 are tightly spline-fitted in the rotational direction as usual.

Further, between the two clutch disks 3a and 3b facing each other, the base end of the centering plate 7 is fixed to the other clutch disk 3b, and a recess 8 into which the tip of the centering plate 7 engages is formed in one clutch disk 3a. A mechanism for determining the phase in the rotational direction of both clutch disks 3a and 3b is provided.

Instead of the centering plate 7, a coil spring 7a may be provided as a flexible seat 10 as shown in FIG. 7A, or as shown in FIG. 7B.
It may be an elastic body 7b made of rubber or the like as shown in FIG. 7, or a bent plate spring 7c as shown in FIG. 7C. Other options include torsion springs.

The spring constant of this centering plate 7 and other centering members is T (Kg-m) = Rm ^(m) ×
From the formula W ⁽ Kg ⁾ , it is desirable to define the spring constant as T (Kg - m/deg).

Furthermore, in the above configuration, the spring force of the damper spring 9a on the side of the clutch disk 3a spline-fitted with the spline hub 4a with a gap θ is increased, and the spring force of the damper spring 9a on the side of the clutch disk 3a that is tightly fitted on the spline hub 4b is increased. By softening the spring force of damper spring 9b, clutch disc 3
The torsion angles of a and 3b are different in size.

Since the present invention has the above-described structure, as shown in the damper characteristic diagram in FIG. While the free torsion angle θ ₁ due to the gap θ is acting, the damper of only the other clutch disc 3b operates, and a low spring constant is obtained. Further, when the free torsion angle θ1 or _more is reached, one of the clutch discs 3a also operates as a damper, and both clutch discs 3a
The total damper characteristics based on a and 3b are obtained by changing in three stages.

The centering plate 7 adjusts the phase of both clutch disks 3a and 3b so that the gap θ between the tooth groove 10 of the spline hub 4a and the spline tooth 5a is realized on the rotational direction side of the clutch disk 3a, as shown in FIG. After positioning, when one clutch disk 3a is twisted to a floating torsion angle θ ₁ , as shown in FIG. 5, a repulsive force is applied so that it returns to the original position shown in FIG. 4 after actuation.

Further, the spline hub 4a has the gap θ.
The spring force of the damper spring 9a on the clutch disk 3a side fitted to the spline hub 4 is increased.
In the case of a structure in which the spring force of the damper spring on the side of the clutch disk 3b that is tightly fitted to the clutch disk 3b is softened, a larger displacement in the torsion angle of both the clutch disks 3a and 3b can be obtained.

<Effects of the Invention> As described above, according to the present invention, one clutch disk is tightly fitted in the rotational direction to the spline fitting portion of the input shaft, and a free movement gap is formed in the rotational direction of the other clutch disk. At the same time, a centering plate is provided between both clutch disks for phasing the rotational direction of both clutch disks, and a floating gap is formed in the rotational direction at the spline fitting portion to form a centering plate between the fitted clutch disks. The spring force of the damper spring is made stronger than the spring force of the damper spring on the clutch disk side, which is tightly fitted in the spline fitting part in the rotation direction, to reduce the return angle, and the rotation direction is tightly fitted in the spline fitting part. Since the spring force of the damper spring on the clutch disk side is softened to increase the return angle, the damping characteristics of the damper springs of both clutch disks based on the above-mentioned floating gap are 1 stage due to only one clutch disk, and 2 stages due to only one clutch disk. A three-step change can be obtained with two clutch disks, and the phase difference rotation of both clutch disks ensures a large total torsion angle as shown in Figure 6, expanding the range of spring constant selections. , an optimum spring constant can be obtained, and in addition to the advantages of the conventional technology in which the damper springs have different spring constants, this has the effect of further reducing abnormal noise and improving the feeling when starting.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the present invention, Fig. 2 is a sectional view showing spline fitting of one clutch disk, Fig. 3 is a sectional view showing spline fitting of the other clutch disk, and Fig. 4 is a sectional view showing the spline fitting of one clutch disk. 5 is a local sectional view showing the positional relationship between both clutch disks, FIG. 5 is a local sectional view when one clutch disk is twisted by the free torsion angle, FIG. 6 is a characteristic diagram of the damper of the present invention, and FIG. 7 is a centering It is a figure which shows each Example of a member. 1...Flywheel, 2...Intermediate plate, 3
a, 3b...Clutch disk, 4a, 4b...Spline hub, 5...Input shaft, 5a...Spline tooth, 7...Centering plate, 9a,
9b...damper spring, 10...tooth groove, θ...gap.

Claims (1)

[Claims] 1. Clutch disks are separately spline-fitted to the input shaft using spline hubs at the front and rear of the clutch disk via an intermediate plate, and the spring constants of the damper springs provided on the respective clutch disks are set to be different from each other. In the multi-plate clutch, the one clutch disk is tightly fitted in the rotational direction to the spline fitting portion, and the other clutch disk is fitted in the rotational direction with a loose gap formed therebetween. A centering plate is provided for phasing the rotational direction of both clutch disks, and a floating gap is formed in the rotational direction in the spline fitting portion, and the spring force of the damper spring on the fitted clutch disk side is applied to the spline fitting portion. The spring force of the damper spring on the clutch disk side that is tightly fitted in the rotation direction is made stronger to reduce the return angle, and the spring force of the damper spring on the clutch disk side that is tightly fitted in the spline fitting part is made softer. A multi-plate clutch characterized by a large return angle.