JPS6018659Y2 - damper disc - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a damper disk for absorbing sudden torque fluctuations of an engine.

This type of damper disk has annular side plates arranged on both sides of the outward flange of the hub spline-fitted to the output shaft, and a plurality of window holes spaced circumferentially at corresponding positions on the flange and side plates. A coil spring roller extending in the circumferential direction is arranged in each window hole, and the side plate is connected to the engine flywheel, so that the torque from the flywheel is transmitted to the output shaft via the side plate, spring, flange, and hub. It is designed to absorb sudden torque fluctuations by compressing the spring.

However, if a long, soft spring is used in this case, the spring belly will bulge out in the radial direction due to centrifugal force, or it will bend when compressed and protrude from the window hole, so it is best to use only short, hard springs. Therefore, there was a problem in that the change in the amount of spring compression with respect to torque fluctuations was small, and torque fluctuations could not be effectively absorbed.

The present invention solves the above problem by arranging two torsion units with a structure similar to the conventional damper disk in series.The two units are arranged on the output shaft, and the circular The plate (or side plate) is connected to the flywheel, and the outer periphery of the side plate (or disc) of the input side unit is connected to the outer periphery of the side plate of the other output side unit via bolts or rivets, and the output side unit is connected to the flywheel. The disc is fixed to the output shaft so that it cannot rotate relative to the output shaft, and the side plate of the output side unit and the side plate and disc of the input side unit are arranged so that they cannot rotate relative to the output shaft. explain.

In FIG. 1, which is a longitudinal cross-sectional view of the present invention, the output side torsion unit A includes an annular disk 1, and the outer periphery of the disk 1 has a plurality of bolts 2 arranged at intervals in the circumferential direction. It is fastened to the flywheel F by.

Annular side plates 3 and 4 are arranged on both sides (left and right) of the disk 1, and a plurality of windows are provided at mutually opposing positions in the radial center of the disk 1 and both side plates 3.4. Hole 5.6. 7 are provided at intervals in the circumferential direction.

The windows 5.6.7 are substantially rectangular and extend in the circumferential direction, with each pair of windows 5, 6 facing each other. A compression coil spring 8 extending in the circumferential direction is fitted into the spring 7 .

A friction spring 10 (cone spring), a friction plate 11, and a friction washer 12 are interposed between the right side plate 4 and the disc 1 on the inner peripheral side of the spring 8, and the left side plate 3 and the disc A friction washer 13 is interposed between the friction members 1 and 1, and a compressive force is applied to these friction members by a stud pin 15 that connects the inner peripheral portions of the side plates 3 and 4.

16 is an elongated hole provided in the disc 1 that is long in the circumferential direction, and the pin 15
is loosely fitted into the elongated hole 16.

The output side torsion unit B has almost the same structure as the input side torsion unit A mentioned above, and compared to the input side unit A,
The disc 21 has a slightly small diameter, and its outer periphery is a flywheel F.
The disc 21 is not fastened to the hub 20, and the disc 21 is integral with the spline hub 20 at the inner periphery.
The difference is that it forms an outward flange of 0.

The hub 20 has spline teeth 22 on its inner periphery that fit into an output shaft (not shown), and an input unit A that rotatably fits on the outer periphery of a portion of the hub 20 that protrudes leftward from the output unit B. ing.

19 is Bush.

The outer peripheries of both units A and B are connected by bolts 40 arranged at intervals in the circumferential direction.

The bolt 40 is inserted and fitted into the hole of each side plate 3, 4, 24, 23 from the left side, and is fixed by a nut 41 screwed into the right end portion.

42, 43, and 44 are colors.

A long hole 45 is provided in the disk 1 for passing the bolt 40, and a notch 46 is provided in the disk 21 at its outer periphery.

Both the elongated hole 45 and the notch 46 extend in the circumferential direction,
Between the two substantially radial inner surfaces 47.48 (two pieces each) and the collars 42.44, when inactive, the disk 1 and the side plates 3, 4 and the disk 21 and the side plates 23, 24 are arranged, respectively. In a relatively untwisted state, they are separated by an interval corresponding to a twist angle of 6°, which will be described later.

Figure 1 shows the following piping motion, and Figure 2 shows the relationship between torque and torsion angle.
This will be explained using figures.

Note that in FIG. 2, the line M indicates the torsional characteristics of the entire device,
Line N shows the torsion characteristics of each unit A and B.

First, the torque T transmitted from the flywheel F to the disc 1
(Fig. 2) is extremely small (O-P), torque T is transmitted from the disc 1 to the side plates 3, 4 via friction members such as friction washers 13.12, and from the side plate 3.4 via the bolts 40. is transmitted to the side plates 23 and 24, and the side plate 2
3 and 24, it is transmitted to the output shaft via the friction washers 33 and 32, the disc 21, and the hub 20.

When torque is transmitted through the friction member in this way, the coil springs 8 and 28 do not participate in torque transmission and are not compressed, so that the disc 1 and the side plates 3 and 4 as well as the disc 21 and the side plates 23 and 24 are There is no relative twisting.

When the torque T exceeds a certain value T1, slippage occurs in the friction members of both units A and B, and the torque T is transmitted from the disk 1 to the side plates 3 and 4 via the spring 8.

The torque T transmitted from the side plates 3 and 4 to the side plates 23 and 24 via the bolts 40 is transmitted to the disc 21 via the spring 28, and from the disc 21 to the output shaft via the hub 20.

In that case, when the spring 8 is compressed and the disk 1 is twisted, for example, by 3 degrees with respect to the side plates 3 and 4 (T=T2), the spring 28 is also compressed by the same amount as the spring 8, so that the disk 21 is twisted by the same amount as the spring 8. As a result, the side plates 23 and 24 are twisted by 3 degrees in the same direction, and as a result, the disk 1 is twisted by 6 degrees with respect to the disk 21.
In this way, the twist angle relative to the torque T increases.

When the torque T reaches the predetermined value T3 and the twist angle becomes 8° (
Point Q) The slope of line M increases.

Although not shown, this is because some of the coil springs 8 and 28 are springs that begin to be compressed only when the twist angle reaches 8 degrees.

Even in the subsequent steep slope region QR, the torsion angle is the sum of the torsion angles in each unit A and B.

When the torque T reaches the maximum value T and the twist angle becomes 12 degrees, the twist angle in each unit A and B becomes 6 degrees.
Therefore, the bolt 40 comes into contact with the inner surfaces 47 and 48 of the elongated hole 45 and the notch 46, and further twisting is prevented.

Next, when the torque T decreases, the torsion angle decreases with characteristics corresponding to the curve RQ-P and including hysteresis corresponding to the section OP.

As explained above, according to the present invention, the torsion unit A has a structure similar to a conventional damper disk.

Since B are arranged in a double layer and in series, for example, the torsion angle at torque T2 was 3° in the conventional product consisting of one unit, but in the present invention it is twice that, 6°.
In this way, it is possible to increase the change in torsion angle with respect to fluctuations in torque T, so vibrations from the engine side, such as sudden fluctuations in engine torque and teeth rattling noise of a diesel engine, can be absorbed extremely effectively. Can be done.

Furthermore, although the torsion angle is large, the amount of compression of each spring 8, 28 is the same as in the conventional case, so there is no risk of the springs 8, 28 being bent and causing malfunction.

Both units A and B are 1. Since the units A and B are connected by the gate 40, the units A and B can be easily assembled and disassembled.

Unit A from Bolt 401. The shearing force applied to the bolt 40 connecting the outer circumferential portions of B is small when the torque t1 is transmitted, and therefore a small-diameter, lightweight bolt 40 can be used, and the weight of the device can be reduced.

Since the bolt 40 comes into contact with the inner surfaces 47 and 48 of the elongated hole 45 and the notch 46 to prevent further twisting, there is no need to provide a separate stopper pin, and the structure can be simplified.

Of the springs 8 and 2.8, if the start timing of the spring that detects its activation after it has been twisted by a certain amount is set to be different between the input side unit A' and the output side unit B, the torsion characteristics can be improved by three steps ( By adding the 0-P part, it can be changed to 4 stages).

Next, another embodiment will be explained with reference to FIG.

The apparatus of FIG. 3 differs from the apparatus of FIG. 1 in the following ways.

That is, the left side plate 53 of the input side unit A1 has a large diameter, and its outer circumference is fastened to the flywheel F with bolts 52.

The disk 51 integrally has an arm 87 extending to the right on its outer periphery, and the right end of the arm 87 is fastened with a bolt 90 to the large diameter side plate 73 on the left side of the output side j knit a.

The disc 51 is integrated with the bub 89 at its inner periphery.

The bubble 89 is separate from the bubble 7° of the output unit a, has no spline teeth on its inner periphery, and is rotatably fitted to the output shaft 88.

Torque from the flywheel F by the device of FIG. 3 is transmitted in the following order.

Side plate 53 (side plate 54) - Spring 58 and/or friction washer 62, 63, etc. - Disc 51 - Arm 87 - Side plate 73 (side plate 74) - Spring 78 and/or friction washer 82, 81 - Disc 71 - Bub 70 - Output side 88° Rivets 91 as shown in FIG. 4 can be used in place of the bolts 40 of the device shown in FIG. 1.

The rivet 91 has an integral large diameter portion 92 or collar between the side plates 4 and 24.

If you use rivet 91, it will take some time to disassemble it, but
Assembly becomes extremely simple.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a graph showing the torque-torsion characteristics of the device shown in FIG.
FIG. 4 is a longitudinal cross-sectional partial view showing different embodiments. 1.21... Disk, 3.4.23.24... Curved side plate, 5, 6, 7, 25, 26.27... Window hole, 8.28... ...Coil spring, A, B, curved torsion unit, F...Flywheel.

Claims (1)

[Scope of utility model registration request] Side plates are arranged on both sides of the annular disc, window holes are provided at opposing positions of the side plates and the disc, and two torsion units connecting the side plates and the disc are connected to the output shaft by coil springs placed in the window holes. The disc (or side plate) of one unit is connected to the input flywheel, and the outer periphery of the side plate (or disc) of the input unit is connected to the output side of the other unit via bolts or rivets. Connected to the outer periphery of the side plate, the disk of the output side unit is fixed to the output shaft so that it cannot rotate relative to it, and the side plate of the output side unit and the side plate and disk of the input side unit are arranged so that they cannot rotate relative to the output shaft. A damper disc that is characterized by: