JPH0574734B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a spring plate, and in particular, to a mass damper for preventing resonance due to the meshing sound of a differential gear on a rear axle of a vehicle, by rolling a spring plate. The present invention relates to a spring plate that is integrally formed and whose natural frequency can be freely changed by rolling.

Prior Art Conventionally, according to Utility Model Application No. 59-133847, a leaf spring 1 as shown in FIG. 4 resonates with a frequency component around 40 Hz of vibration generated by engagement of a differential gear on a rear axle of a vehicle. However, this structure can be prevented by integrally providing a mass damper at the center of the front and rear spans of the uppermost spring plate of the leaf spring. There is. However, since the mass damper shown in the conventional example was formed in a rectangular shape protruding above the spring plate, it may be difficult to implement in actual manufacturing, and there is room for improvement. It was hot.

Purpose The present invention has been made in order to eliminate the drawbacks of the above-mentioned prior art, and its purpose is to cause a leaf spring to resonate with vibrations generated from a differential gear, etc. of the rear axle of a vehicle. By forming an integrated mass damper on the spring plate at the same time as rolling the spring plate, which prevents the plate spring from amplifying meshing vibration of gears, the spring plate can be The purpose is to make it possible to freely change the natural frequency of the spring, and thereby more completely prevent resonance of the leaf spring due to the vibration. Another purpose is to facilitate the formation of such a mass damper and to improve mass productivity.

Configuration In short, the present invention is characterized in that convex portions serving as mass dampers are integrally formed at a plurality of locations in the length direction by rolling.

The present invention will be explained below based on embodiments shown in the drawings. As shown in FIG. 1, the spring plate 2 according to the present invention has convex portions 2a as mass dampers formed by rolling at a plurality of locations in the length direction, for example, at the center of each left and right span of a U-bolt tightening portion 2u. It is integrally formed by. Also this spring plate 2
is formed so that the plate thickness gradually increases from the center portion 2e toward the U-bolt tightening portion 2u so that the entire body is basically formed as a long tapered spring plate. Therefore, the spring plate 2 according to the present invention
Unlike the conventional example, the convex portion 2a of the upper surface 2 of the spring plate 2
The height of the convex portion 2a closer to the eyeball portion 2e is lower than that of the convex portion 2a closer to the U-bolt tightening portion 2u. .

By using the spring plate 2 according to the present invention, the second
In order to construct a stacked leaf spring 3 as shown in the figure, another spring plate 4 having a convex portion 4a formed thereon in the same manner as the spring plate 2 is stacked on the lower side of the spring plate 2, and the ends of the spring plate 2 are 2b is brought into contact with the upwardly protruding end 4b of the spring plate 4, and if necessary, a spacer 5 made of polycarbonate resin or the like is placed between both spring plates 2 and 4.
are interposed, and the spring plates 2 and 4 are connected through this spacer 5.
Appropriate friction between the plates can be obtained by bringing them into contact in the middle of one span. Then, the axle 9 and the stacked leaf spring 3 can be fixed with the U-bolt 8 via the pad 6.

Next, the rolling process of the spring plate 2 according to the present invention will be explained with reference to FIG. 5. The spring plate material 10 advances in the direction of arrow A in the figure,
rotates in the direction of arrow B, and the upper rolling roll 12 rotates in the direction of arrow C, respectively. In this case, the rolling roll 12 is formed with, for example, two convex parts 12a and two concave parts 12b, and the other parts have a profile with a gradually increasing radius of curvature, a concentric profile, etc. to give the spring plate 2 a long taper. It is composed of Then, as described above, by rotating both rolling rolls 11 and 12 in the directions of arrows B and C and feeding the spring plate material 10 in the direction of arrow A, a convex portion 2a as shown in FIG. 1 is formed. The spring plate 2 can be rolled into a spring plate 2 provided at the center of one span on both sides of the U-bolt tightening portion 2u. Further, the number of convex portions 2a is not limited to two per span, and the number of convex portions 2a may be one or three or more as necessary.

Effects The present invention is configured as described above, and its effects will be explained below. By using the spring plate 2 according to the present invention in a vehicle, a plurality of convex portions 2a are formed between the U-bolt tightening portion 2u of the spring plate and the eyeball portion 2e. , the partial mass of the spring plate changes, and the natural frequency of the spring plate 2 changes. For example, the plate spring resonates with vibrations generated from a differential gear (not shown) on the rear axle of a vehicle, causing the gear to change. This prevents the effect of amplifying the meshing vibrations of the engine, making it possible to reduce the interior noise of the vehicle. Also, such a convex portion 2
a can be formed at the same time during the rolling process, and its position can be changed arbitrarily depending on the shape of the rolling roll 12, so it is extremely suitable for mass production and has an arbitrary natural frequency. It is possible to use a tabular plate 2.

Further, by using the spring plates 2 and 4 according to the present invention in the stacked plate spring 3 as shown in FIG. 2, a spacer 5 can be interposed between the spring plates 2 and 4, and this spacer The convex portion 2a of the spring plate 2 via
is in contact with the spacer, and the spacer is in contact with the spring plate 4.
Since it is in constant contact with the upper surface 4c of the leaf spring 3, a large friction between the plates can be obtained, and the damping characteristics of the stacked leaf spring 3 can be improved.

Further, as shown in FIG. 3, one of the stacked leaf springs 13
An intermediate spring plate 14 may be interposed between the number spring plate 11 and the second spring plate 12, and a plurality of convex portions 14a serving as mass dampers may be asymmetrically formed on both upper and lower surfaces of the intermediate spring plate. Further, as shown in FIG. 4, the first spring plate 21 and the second spring plate 22 of the stacked leaf spring 23 are
It is also possible to interpose an intermediate spring plate 24 between the intermediate spring plate and to form a plurality of convex portions 24a as mass dampers symmetrically on both upper and lower surfaces of the intermediate spring plate. Note that the functions of these embodiments shown in FIGS. 3 and 4 are the same as those described above, and therefore explanations regarding the functions will be omitted.

Effects Since the present invention is configured and operates as described above, the leaf spring resonates with the amplitude generated from the differential gear of the rear axle of the vehicle, and the leaf spring absorbs the meshing vibration of the gears. Since an integrated mass damper that prevents amplification is formed on the spring plate at the same time as the spring plate is rolled, the natural frequency of the spring plate can be freely changed depending on the method of rolling. There is an effect, and as a result,
The effect of being able to more completely prevent resonance of the leaf spring due to the above-mentioned vibration can be obtained. Further, the formation of such a mass damper can be facilitated, and there is an effect that mass productivity can be improved.

[Brief explanation of the drawing]

1 to 5 relate to embodiments of the present invention, FIG. 1 is a side view of a spring plate, FIG. 2 is a side view of a stacked leaf spring using spring plates according to the present invention, and FIG. 3 is a side view of a spring plate according to the present invention. FIG. 4 is a side view of a stacked leaf spring in which convex portions are formed asymmetrically on both the upper and lower surfaces of the intermediate spring plate. FIG. FIG. 6 is a side view showing a step of forming a convex portion by rolling, and FIG. 6 is a side view of a long taper spring plate according to a conventional example. 2 and 4 are spring plates, 2a, 4a, 14a, 24a
is a convex portion serving as a mass damper.

Claims (1)

[Claims] 1. A spring plate characterized by integrally forming convex portions as mass dampers at multiple locations in the length direction by rolling.