JPS5827146Y2 - damper - Google Patents

Description

[Detailed description of the invention] This invention relates to a damper that damps torsional vibrations applied to rotating shafts such as the crankshaft, camshaft, or drive shaft of an internal combustion engine to prevent accidents such as breakage of the rotating shaft. It is.

In recent years, a type of damper called a viscous rubber damper has come into use.

An example of a conventional product of this viscous rubber damper will be explained with reference to FIG. A peripheral edge portion 3a of a substantially disk-shaped mounting plate 3, which has a concave portion 2 that opens radially inward and continues in the circumferential direction on the circumferential side and is disposed coaxially with the inertial mass body 1, is Inner wall surfaces 2 a that are inserted into the recess 2 of the inertial mass body 1 and face each other near the open end of the recess 2 .

Annular rubber bodies 4, 4' are disposed between 2a' and both front and back surfaces 3b, 3b' of the mounting plate 3 so as to be coaxial with the inertial mass body 1, and these rubber bodies 4, 4' Mounting plate 3
and the inertial mass body 1, and further the recess 2
The narrow gap between the inner inner part 2b and the peripheral edge 3a of the mounting plate 3, that is, the gap closed by the rubber body 4.4', is filled with a viscous fluid 5 such as silicone oil. .

For such a damper, if the mounting plate 3 is fixed to a rotating shaft 6 such as a crankshaft, the initial torsional vibration can be absorbed by the shear resistance of the viscous fluid 5 and the elasticity of the rubber bodies 4 and 4'. At the same time, it is known that secondary vibrations caused by resonance of the rubber are absorbed by the shear resistance of the viscous fluid 5, thereby exhibiting much better torsional vibration damping characteristics than ordinary rubber dampers.

However, in such a viscous rubber damper, since the peripheral edge 3a of the disc-shaped mounting plate 30 is inserted into the inward recess 2 of the annular inertial mass body 1 as described above, the entire inertial mass body 1 is Therefore, in the conventional damper, it is constructed from a pair of divided pieces IA and IB as described above, and the divided piece IA and IB are connected to the mounting plate 3.
, after setting IB to the new position, separate pieces IA and IB
It was usual to connect and fix them by means of fixing such as caulking or welding.

However, the inertial mass body 1 is divided into a pair of divided pieces IA as shown in FIG.

The actual situation is that when constructed from 1B, the processing cost must be extremely high.

That is, in order to obtain the upper divided piece 1A shown in FIG. The portion 72A is cut off into a perfect circle by fusing or the like to obtain a hollow annular intermediate material 8A, and further the intermediate material 8 is cut as shown in FIG. 2B.
It is normal to cut the hypothetical shaded area 81A in FIG. 2B with a residue that has the shape and dimensions of one divided piece for A, and in order to obtain the lower divided piece 1B in FIG. , 3rd
A square material 7 having a thickness t2 as shown by the imaginary line in Figure A
B is prepared, and its peripheral portion 71B and central portion 72B are cut off into a perfect circle in the same manner as described above to obtain a hollow annular intermediate member 8B,
Furthermore, as shown in FIG. 3B, the divided piece 1B is
The hypothetical shaded area 81 in Fig. 3B is 1, which has the shape and dimensions of
Normally, B, 82B, and 83B are cut, but since each divided piece has a relatively small axial length and a relatively small thickness t1/, the thickness t of the material 7A is also relatively thin, so it is difficult to cut from the material 7A. Peripheral part 71A3- and central part 72A to be dropped
, and the volume of the portion 81A cut and removed from the intermediate material 8A is also relatively small.On the other hand, the maximum axial length t2/ of the divided piece 1B is twice the thickness tll of the divided piece 1A. Since the thickness is nearly three times that of the above, it is necessary to use a material with a considerably large thickness t2 as the material 7B. Therefore, the peripheral part 71B and the central part 7 that should be cut off from the material 7B
2B has a large volume, and the volumes of the parts 81B, 82B, and 83B that should be cut and removed from the intermediate material 8B account for more than half of the entire intermediate material 8B. There are problems such as a large amount of powder, resulting in a significantly poor material yield, and extremely long work times required for fusing and cutting, and as a result, the cost of the damper as a whole inevitably increases. Met.

This invention was made in view of the above circumstances, and aims to provide a viscous rubber damper with a structure that has a good material yield and is easy to process.

Embodiments of this invention will be described in detail below with reference to FIGS. 4 to 7.

Note that in each of the following embodiments, the parts other than the inertial mass body 1 are the same as those of the conventional damper, so a description thereof will be omitted.

FIG. 4 shows a first embodiment of this invention, in which the inertial mass body 1 is located at the peripheral edge 3a of the mounting plate 3.
an annular first divided piece 11 facing one plate surface of the peripheral edge 3a; and an annular second divided piece 1 facing the other plate surface of the peripheral edge 3a.
2, and an annular third portion facing the outer peripheral end surface of the peripheral edge portion 3a.
It is composed of a divided piece 13.

The first divided piece 11 is one divided piece 1 that can be pressed in the conventional example.
The second divided piece 12 is made to have almost the same shape as a human, and the second divided piece 12 is made to have a symmetrical shape to the first divided piece 11.

On the other hand, the third divided piece 13 is made so as to completely cover the outer circumferential surface of the first divided piece 11 and the outer circumferential surface of the second divided piece 12, and has a protrusion continuous in the circumferential direction at the center of the inner circumferential surface. Part 13
a is formed, and this protrusion 13a is inserted between the first divided piece 11 and the second divided piece 12 and is configured to face the outer circumferential surface of the mounting plate 3. Thin projecting edges 13b and 13b' are formed in the projecting edge 1.
3b and 13b' are the first divided piece 11 and the second divided piece 12
The 0 corners are caulked.

The third divided piece 13 is made by bending a straight material 13', which has been made to have a desired cross-sectional shape by extrusion or drawing into a desired cross-section as shown in FIG. 5 AVc, into an annular shape as shown in FIG. 5 BVC. It is made by abutting the two ends together and joining the abutted portion 10 by welding or the like.

In addition, in the embodiment shown in FIG. 4, the means for fixing the third divided piece 13 to the corners of the first divided piece 11 and the second divided piece 12 is not limited to ``1 caulking'', but may be welding.

FIG. 6 shows a second embodiment of this invention. In this embodiment, the third divided piece 13 is made in an annular shape with a rectangular cross section, and this third divided piece 13 is connected to the first divided piece 11 and Stepped notches 11a are formed at the corners of the outer periphery of the second divided piece 12 closer to each other.

12a, and the width direction end face of the third divided piece 130 is welded 14 to the first divided piece 11 and the second divided piece 12.

As shown in FIG. 7A, the third divided piece 13 in this embodiment uses a straight strip material 13'' having a rectangular cross section.
3" is curved into an annular shape as shown in FIG. 7B, its both ends are abutted, and the abutted portion 10 is joined by welding or the like.

According to the second embodiment shown in FIG. 6 and FIG. 7, a general-purpose steel material can be used for the material 13'' of the third divided piece 13, which has the effect of lowering the cost even more than in the case of the first embodiment. is obtained.

As shown in each of the above embodiments, the dotted material 13' or 13
It was possible to obtain the third divided piece 13 by bending and joining both ends of the third divided piece 13.
Since the mounting plate 3 is configured to face only the outer peripheral end face thereof, the thickness in the radial direction may be much smaller than that of the first divided piece 11 and the second divided piece 12.

As is clear from the above description, in the damper of this invention, the inertial mass body 1 is connected to the first separating piece 11 button and the second dividing piece 12 facing each front and back surface of the peripheral edge 3a of the mounting plate 30, and the mounting plate 30. This can be achieved by coaxially fixing the second divided piece 12 directly facing the outer peripheral end of the mounting plate 3 and the third divided piece 13 facing the outer peripheral end surface of the mounting plate 3.

That is, in the inertial mass body 1, a portion facing each plate surface of the peripheral edge portion 3a of the mounting plate 30 and a portion facing the outer peripheral end surface are made separately.

Here, the first divided piece 11 and the second divided piece 12 can be made to have almost the same shape as the upper divided piece applied in the conventional example, so they will be scraps or chips in the same way as the processing of one divided piece. There are relatively few parts, and the processing work is relatively easy.

On the other hand, the third divided piece 13 is obtained by curving the dotted strip material 13' or 13'' into an annular shape and welding the butt parts 10 at both ends, so the material yield is approximately 100.
% and is easy to process.

Therefore, the inertial mass body 1 as a whole has a much better material yield than conventional ones, and is also easy to construct.

Furthermore, among the divided pieces constituting the inertial mass body 1, especially the third divided piece 13 can have the same simplified shape and cross-sectional size even if the damper size is different, and therefore has the same cross-sectional shape. If you prepare one type of dotted strip material 13' or 13'' with a cross-sectional dimension of Since it can be commonly used for products of various sizes, it is possible to further reduce material costs.

Therefore, the damper of this invention significantly reduces the material cost and processing cost required for the inertial mass body compared to conventional ones.
It is possible to advantageously reduce the cost of the damper as a whole.

[Brief explanation of the drawing]

Fig. 1 shows a simplified vertical cross-section of an example of a conventional viscous rubber damper, and Fig. 2 shows the step-by-step machining process of one divided piece 1A of the inertial mass body 1 used in the damper shown in Fig. 1. FIG. 3 is a schematic diagram showing step-by-step the processing process of the other divided piece 1B of the inertial mass body used in the damper shown in FIG. 1, and FIG. FIG. 5 is a longitudinal sectional view showing a damper according to one embodiment, FIG. FIG. 7 is a longitudinal cross-sectional view showing the damper of the second embodiment, and is a schematic diagram showing step-by-step the processing process of the third divided piece 13 used in the damper shown in FIG. 6. 1... Inertial mass body, 2...-- Concavity, 3...
...Mounting plate, 4.4'...Rubber body, 5.
... Viscous fluid, 10 ... Butt part, 1
1...First divided piece, 12...Second divided piece, 13...Third divided piece, 13', 13"...
・・・Dotted material.

Claims (1)

[Claims for Utility Model Registration] A concave portion that opens radially inward and continues circumferentially is formed on the inner peripheral side of the inertial mass body, which is generally annular as a whole, and is coaxial with the inertial mass body. The peripheral edge of the approximately disk-shaped mounting plate arranged in such a manner is inserted into the recess, and an annular rubber body is inserted between the inner wall surface near the opening end of the recess and the front and back surfaces of the mounting plate, respectively. These rubber bodies elastically connect the mounting plate and the inertial mass body, and the viscous fluid flows into the gap between the innermost part of the recess and the peripheral edge of the mounting plate. In the damper for torsional vibration prevention, the inertial mass body is filled with an annular first divided piece facing one plate collapse near the peripheral edge of the mounting plate, and the other plate near the peripheral edge of the mounting plate. A second annular divided piece facing the surface and a third annular divided piece facing the outer peripheral end surface of the mounting plate are coaxially fixed and integrated, and the third divided piece is made of a straight strip material. A damper characterized in that it is made by curving into an annular shape and joining the abutting portions of both ends.