JPH0334336Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dynamic damper installed in a drive shaft of a vehicle, particularly a propeller shaft of an automobile.

[Conventional technology]

In general, a dynamic damper has mass, spring,
This is a vibration absorber composed of a dart pot, and is configured so that by attaching it to the vibrating body (rotating body) in question, the amplitude of resonance of the vibrating body can be reduced.

It is known that a dynamic damper is attached to a rotating drive shaft in order to reduce abnormal noise caused by torsional vibrations of an automobile's drive system (for example, see Japanese Utility Model Publication No. 59-22362).
This dynamic damper has a structure in which an outer ring equipped with an annular weight and an inner ring attached to a drive shaft are connected by an elastic connecting member.

[Problem that the invention attempts to solve]

However, in the dynamic damper having the above-mentioned structure, the annular weight is integrally formed into an inseparable annular body. Therefore, it is necessary to fit and install the inner ring of the dynamic damper from one end of the drive shaft, which makes assembly difficult. However, the dynamic damper cannot be installed while the drive shaft is mounted on the vehicle. Therefore, it is not possible to tune the dynamic damper while it is mounted on the vehicle. Further, due to the above-mentioned assembly, there were problems in that the external dimensions of the drive shaft were restricted and the mounting position of the dynamic damper was also severely restricted.

Therefore, the technical problem of the present invention is to make it possible to install a dynamic damper even when it is mounted on a vehicle, and to improve its assemblability.

[Means for solving problems]

Therefore, the present invention employs the following configuration as a means for solving the above-mentioned problems.

That is, in the present invention, the dynamic damper of the vehicle drive shaft is divided into a plurality of parts in the circumferential direction, and the parts are integrally joined by a separable joining means.

Specifically, as shown in FIG. 1, a dynamic damper for a vehicle drive shaft is constructed by connecting an outer ring 12 with an annular weight 11 and an inner ring 13 attached to the drive shaft with an elastic connecting member 14. 10, the dynamic damper 10 is divided into a plurality of parts in the circumferential direction, and the dynamic damper 10 is integrally joined by a separable joining means 20.

[Effect]

According to the above-mentioned means, a plurality of divided bodies divided in the circumferential direction are arranged at predetermined positions on the outer periphery of the drive shaft, and are integrally connected by the coupling means 20, thereby forming the dynamic damper 10 on the outer periphery of the drive shaft. is installed.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

1 to 3 show a dynamic damper for a vehicle drive shaft according to one embodiment of the present invention, in which FIG. 1 is an exploded front view, and FIGS. It is sectional drawing along the - line and - line of.

10 indicates the entire dynamic damper, which includes an outer ring 12 having a generally annular weight 11;
Inner ring 1 attached to a drive shaft (not shown)
3, and a radial elastic connecting member 14 that connects the outer ring 12 and the inner ring 13.

The dynamic damper 10 is divided into two parts in the circumferential direction at a plane including the center of rotation.

The annular weight 11 is made of iron and is integrally molded with an inner ring 13 and an elastic connecting member 14 made of an elastic material such as rubber. In particular, as shown in FIG. 2, the outer surface of the annular weight 11 is covered with a thin elastic protective film 15, and only the central portion of the outer peripheral surface 16 is exposed to the outside in an annular shape. There are screw holes 1 in the radial direction on both ends of the outer circumference of the annular weight 11.
7 is formed.

In addition, as shown in FIG. 6 in particular, the inner ring 13 is set to have a longer dimension in the axial direction than the outer ring 12, and has annular grooves on the outer periphery of both ends for mounting a tightening band (not shown). 18 are formed. The inner peripheral surface 19 of the inner ring 13 is set to have an inner diameter that is the same as or smaller than the outer diameter of the drive shaft.

Three elastic connecting members 14 extend in the radial direction in each of the two halves at equal intervals.

Furthermore, a separable coupling means 20 is provided for integrally coupling the two halves. This coupling means 20 has bolt mounting holes 21 at both ends.
An arc-shaped coupling plate 22 and a bolt 23 having
It consists of

Then, the two halves of the dynamic damper are put together, two coupling plates 22 are arranged at both ends of the outer peripheral surface 16 of the annular weight 11, and four bolts 23 are connected to the outer peripheral surface 16 of the annular weight 11.
By fastening to the screw hole 17 formed in 6,
The dynamic damper 10 is configured by being integrally connected.

Dynamic damper 1 configured as above
0 is assembled as follows.

A dynamic damper half divided into two parts is placed at a predetermined position of the drive shaft, with the inner circumferential surface 19 of the inner ring 13 thereof fitting into the outer circumferential surface of the drive shaft.

Next, the coupling plate 22 is placed on the outer circumferential surface 16 of the annular weight 11 from the outside, and the bolts 23 are fastened into the screw holes 17 of the annular weight, thereby integrally coupling the halves.

Finally, an annular groove 18 formed on the outer periphery of the inner ring 13
By tightening the band (not shown) to
Can be assembled.

Note that if the coupling plate 22 is made of a flexible material, it can be fixed to one half of the dynamic damper in advance with bolts 23, improving ease of assembly.

FIG. 4 is a schematic perspective view of the dynamic damper according to the above embodiment mounted on a propeller shaft as a drive shaft in a four-wheel drive vehicle;
Figure 5 is an enlarged sectional view taken along the - line in Figure 4;
FIG. 6 is a longitudinal sectional view taken along the - line in FIG. 5.

In FIG. 4, 30 is a clutch device, 31 is a transmission, 32 is a transfer device, 34 is a universal joint that connects the output shaft of the transfer device and the propeller shaft 33, and 35 is the propeller shaft 33.
A universal joint connecting the front wheel drive differential device 36 and the front wheel drive differential device 36 is shown.

The dynamic damper 10 is mounted on the outer periphery of a propeller shaft 33 that transmits the rotational driving force of the output shaft of the transfer device 32 to the input shaft of a differential device 36 for driving the front wheels. As described above, the dynamic damper 10 is assembled by integrally joining the two halves with the connecting plate 22 and bolts 23, and further tightening the band 23 into the annular groove 18 of the inner ring 13.

As a result, torsional vibration (rotation fluctuation) of the propeller shaft 33 is effectively reduced by the dynamic damper 10.

According to this embodiment having the above configuration, when the propeller shaft 33 serving as a drive shaft is mounted on the vehicle, the dynamic damper 10
can be installed.

Therefore, it is possible to tune the dynamic damper 10 (selecting the mass of the annular weight 11 and the spring constant of the elastic coupling member 14) while actually measuring vibration noise in a completed vehicle equipped with the propeller shaft 33. . Furthermore, the dynamic damper 10 can be easily installed in a vehicle that requires improvement in vibration and noise, and a means for after-sales service can be provided.

In addition, since the dynamic damper 10 is assembled in advance by dividing it into parts, there is no need to fit the inner ring 13 of the dynamic damper 10 from one end of the drive shaft to a predetermined position and install it. , extremely easy to assemble.
Furthermore, there is no need to make the outer diameter of the drive shaft smaller than the inner ring 13 of the dynamic damper 10, and the degree of freedom in designing the drive shaft can be increased. Furthermore, there are no restrictions on the mounting position of the dynamic damper 10.

7 and 8 show a dynamic damper for a vehicle drive shaft according to another embodiment of the present invention, with FIG. 7 corresponding to FIG. 5, and FIG. FIG. 7 is a sectional view taken along the line - in FIG. 7;

Note that in FIGS. 7 and 8, parts corresponding to those in FIG. 5 are indicated by the same reference numerals as in FIG.

In this embodiment, the coupling structure is changed so that the two halves of the dynamic damper are coupled at their axial end faces instead of at their outer peripheral surfaces.

That is, a screw hole 24 is formed in the axial direction at one end of the annular weight 11 embedded in the dynamic damper half, and an arc-shaped coupling plate 25 that protrudes in the circumferential direction from the dividing surface is formed at the other end. It is fixed integrally by welding, etc. This arc-shaped coupling plate 25 has a bolt mounting hole 26 formed in its protrusion, and its outer and inner peripheral ends are bent to form flanges 27 and 28.
is formed. The inner diameter of the flange 27 and the outer diameter of the flange 28 are set to be substantially the same as the outer diameter and inner diameter of the annular weight 11, respectively. Note that the outer surface of the annular weight 11 to which the coupling plate 25 is attached is exposed to the outside with the elastic protective film 15 removed.

Then, the dynamic damper half is placed on the outer periphery of the propeller shaft 33, and the coupling plate 25 is
The flanges 27 and 28 of the annular weight 11 are fitted into the inner and outer peripheral surfaces of the annular weight 11, and the bolt 29 is
By fastening it to the screw hole 24, the dynamic damper 10 is integrally connected. Note that the coupling means 20 (coupling plate 25, bolt 29) is connected to the dynamic damper 10.
In terms of rotational balance, it is desirable to arrange them point-symmetrically.

In this embodiment, the dynamic damper halves are connected by the connecting means 20 at the end face in the axial direction of the annular weight 11, so the connecting plate and bolts are fastened to the outer circumferential surface of the annular weight to connect the dynamic damper. Compared to the above embodiment in which the halves are combined, the outer diameter of the dynamic damper 10 can be made smaller, making it easier to mount it on a vehicle.

Although the present invention has been described above in detail with respect to specific embodiments, the present invention is not limited to the above-mentioned embodiments, and includes various embodiments within the scope of the claims for utility model registration. For example, the dynamic damper may be divided into three or more parts. Furthermore, a tightening band may be used as the coupling means instead of the coupling plate and bolts. Furthermore, dynamic dampers can be used not only for propeller shafts but also for front axle shafts of front-wheel drive vehicles.

[Effect of idea]

As described above, according to the present invention, the dynamic damper can be easily installed from the outside in the radial direction of the drive shaft in the state of a completed vehicle in which the drive shaft is mounted on the vehicle, and the ease of assembly is extremely improved. Further, since the dynamic damper can be assembled in the completed vehicle, various dynamic dampers can be selected and installed according to the resonance characteristics of the drive shaft, and torsional vibrations of the drive system can be effectively reduced.

[Brief explanation of drawings]

FIG. 1 is an exploded front view showing a dynamic damper for a vehicle drive shaft according to one embodiment of the present invention, FIG. 2 is a sectional view taken along the - line of FIG. 1, and FIG. A cross-sectional view along the - line of
Fig. 4 is a schematic perspective view of the dynamic damper of the present invention installed on the propeller shaft of a four-wheel drive vehicle, Fig. 5 is an enlarged sectional view taken along the - line in Fig. 4, and Fig. 6 is the same as that in Fig. 5. 7 is a sectional view corresponding to FIG. 5 showing a dynamic damper for a vehicle drive shaft according to another embodiment of the present invention, and FIG. 8 is a sectional view taken along the line 7. - is a cross-sectional view along the line. 10...Dynamic damper, 11...Annular weight, 12...Outer ring, 13...Inner ring, 14...
Elastic connection member, 16... outer peripheral surface of annular weight,
17...Screw hole, 19...Inner peripheral surface of inner ring, 20...
...Coupling means, 21... Bolt mounting hole, 22...
...Joining plate, 23...Bolt, 24...Threaded hole, 25...Joining plate, 26...Bolt mounting hole, 27, 28...Flange, 29...Bolt.

Claims (1)

[Scope of utility model registration request] A dynamic damper is constructed by connecting an outer ring equipped with an annular weight and an inner ring attached to a drive shaft using an elastic connecting member, and the dynamic damper is divided into a plurality of parts in the circumferential direction and integrated into one piece using separable coupling means. A dynamic damper for a vehicle drive shaft characterized by being combined.