JPH07253338A - Anti-vibration device of measuring instrument panel - Google Patents

Abstract

PURPOSE:To easily change the spring constant and mounting load of an anti- vibration system. CONSTITUTION:An adjustment stopper pin 25 with a second coil spring 15b and a spring sheet 29 is inserted into a hole 16a of a coil spring mounting fitment 16 at the side of a measuring instrument panel 11. Further, a screw part 25a of the adjustment stopper pin 25 where a first coil spring 15a and a spring sheet 27 are fitted is inserted into the hole of a coil spring mounting fitment 20 at the side of a fixing stand 13 and a nut 26 is screwed into the screw part 25a, thus fitting the first coil spring 15a between the coil spring mounting fitment 20 and the coil spring mounting fitment 16 and fitting a second coil spring 15b between the coil spring mounting fitment 16 and a head part 25b of the adjustment stopper pin 25. As a result, the nut 26 can be removed, a coil spring 15 can be changed to a coil spring with a different spring constant to easily change the spring constant of the anti-vibration system. Further, the mounting load of the coil spring 15 can be easily changed by rotating the nut 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a vibration isolation device for an instrument panel that is generally used for a vibrator such as an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, there is an instrument panel vibration isolator as shown in FIG. 4, which is attached to a diesel engine and protects the instrument panel from the motive force generated by the engine. Figure 4
In the above, instrument panel side attachment members 3 formed by bending a metal plate at a right angle are attached to the back sides of the four corners of the instrument panel 2 to which the instrument 1 is attached with bolts. Further, a fixing base side mounting member 5 formed by bending a metal plate at a right angle is attached with bolts to four positions of the fixing base 4 for fixing the instrument panel 2. And a portion of the instrument panel side mounting member 3 which is perpendicular to the instrument panel 2
(Hereinafter, referred to as a vertical plate) and the vertical plate of the fixing base side mounting member 5 are mounted so as to face each other, and the anti-vibration rubber 6 is interposed between the facing vertical plates. The vibration caused by the vibration force from the engine transmitted from the fixed base 4 side is absorbed.

FIG. 5 is an enlarged view of the vibration isolator on the instrument panel 2. 5 (a) is a side view and 5 (b) is a front view from the instrument panel 2 side. The vertical plate 3a of the instrument panel side mounting member 3 and the fixed base side mounting member 5 facing the vertical plate 3a.
The anti-vibration rubber 6 attached between the vertical plate 5a and the vertical plate 5a is composed of two anti-vibration rubber members 7 and 8 which are substantially V-shaped and made of a rubber plate. The anti-vibration rubber members 7 and 8 are joined together by pins 9 with their V-shaped vertices facing each other back to back to form a substantially X-shaped anti-vibration rubber 6. The anti-vibration rubber 6 thus formed is attached to the vertical plate 3a of the instrument panel side mounting member 3 and the vertical plate 5a of the fixed base side mounting member 5 by the bolt 10
It is installed in.

[0004]

However, in the above conventional vibration isolator for the instrument panel, the vibration isolation rubber 6 interposed between the instrument panel 3 and the fixture table 4 of the instrument panel 3 serves to fix the fixture table. The vibration caused by the vibration force from the engine transmitted from the 4 side is absorbed. However, since it is difficult to change the spring constant and the mounting load of the vibration-proof rubber 6 later, how to select the spring constant in advance is an important and difficult problem. That is, since the weight of the instrument panel 2 is light, the spring constant of the antivibration rubber 6 required to prevent vibration of the instrument panel 2 may be a low value.
However, in general, when the spring constant of the vibration isolating rubber 6 is lowered, the strength of the vibration isolating rubber 6 is lowered, and the instrument panel 2 is dropped due to vibration and falls.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration control device for a dashboard that can easily change the spring constant and mounting load of a vibration control system.

[0006]

In order to achieve the above-mentioned object, a vibration isolator for an instrument panel according to a first aspect of the present invention absorbs a vibration caused by a vibrating force from a vibrating body to cause the instrument panel to absorb the vibration. A vibration control device for the instrument panel to prevent transmission, which has a mounting surface extending in the horizontal direction, and which has the instrument panel side mounting bracket to be installed on the instrument panel and the instrument panel side mounting bracket Mounting brackets that have mounting surfaces facing each other, and are mounted on a fixed base to which the instrument panel is fixed, and the mounting brackets and the mounting platform side that are installed so that the mounting surfaces face each other. An adjusting stopper pin having a threaded portion through which a nut is screwed is provided at one end while penetrating through the holes formed in the mounting bracket and the both mounting surfaces, and a large diameter head is provided at the other end. The state of penetrating through the holes made in the mounting surface of both mounting brackets. Of the adjustment stopper pin in the state of being inserted between the head and the nut and one of the mounting surfaces of the two mounting brackets, and a first coil spring, which is penetrated by the adjustment stopper pin. In this state, the second coil spring is provided between the mounting surfaces of the two mounting brackets in a compressed state.

A vibration isolator for an instrument panel according to a second aspect of the invention is a vibration isolator for an instrument panel, which absorbs vibration caused by a vibration force from a vibrator body and does not transmit it to the instrument panel. In addition to having a mounting surface extending in a predetermined direction, a mounting board side mounting bracket to be installed on the dashboard, and a mounting surface facing the mounting surface of the dashboard mounting bracket,
The mounting brackets on the fixed base that are installed on the fixed base to which the instrument panel is fixed, and the mounting brackets on the instrument panel and the mounting brackets that are installed so that the mounting surfaces face each other are drilled on both mounting surfaces. The adjustment stopper pin is provided with a threaded portion that penetrates through the sloping hole and a nut is screwed on one end, and the other end has a large-diameter head portion. A first coil spring compressed between any one of the head and the nut of the adjustment stopper pin and one of the mounting surfaces of the two mounting brackets in a state of penetrating the hole. At least the mounting surface of the instrument panel side mounting metal fitting extends in the horizontal direction, with a pair of second coil springs compressed between the mounting surfaces of the two mounting metal fittings in a state of being penetrated by the adjustment stopper pin. Vertical direction It is characterized in that it comprises two sets of a set that and extends substantially parallel to the plane of the instrument panel there.

[0008]

According to the first aspect of the present invention, the vertical vibration caused by the exciting force from the vibrator main body is installed on the instrument panel side so that the mounting surfaces face each other and extend in the horizontal direction. Either one of the head and nut of the adjustment stopper pin, which is arranged by inserting the hole formed in both the mounting surfaces of the metal fitting and the fixing base side mounting metal fitting, and one of the mounting surfaces of the both mounting metal fittings. It is absorbed by the first coil spring, which is compressed between the two, and the second coil spring, which is compressed between the mounting surfaces of the mounting brackets.

Here, by removing the nut from the adjusting stopper pin and replacing the first coil spring and the second coil spring with coil springs having different spring constants, the natural frequencies of the first and second coil springs are changed. It is changed according to the vibration frequency of the vibrator body. Further, by rotating the nut, the mounting loads of the first and second coil springs are changed, and the amplitude amount of the instrument panel is optimally adjusted. Thus, the vertical vibration caused by the vibration force from the vibrator body is effectively absorbed.

Further, in the invention according to claim 2, the vertical vibration caused by the vibration force from the vibrating machine main body is attached to the instrument panel side mounting bracket, the fixed base side mounting bracket, the adjustment stopper pin, and the first stopper.
Of the coil spring and the second coil spring, the mounting surface of the instrument panel side mounting bracket is absorbed by the first and second coil springs of the group extending in the horizontal direction. On the other hand, the vibration in the front-rear direction with respect to the instrument panel is caused by the instrument panel side attachment bracket of the set including the instrument panel side attachment fixture, the fixed base side attachment fixture, the adjustment stopper pin, the first coil spring and the second coil spring. Is attached by the above-mentioned first and second coil springs of a set whose mounting surface extends in the vertical direction and is substantially parallel to the surface of the instrument panel. In this way, at least the vibration in the vertical direction and the longitudinal direction caused by the vibration force from the vibrator main body are effectively absorbed.

[0011]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a front view of an instrument panel to which the vibration isolator of this embodiment is applied, and FIG. 2 is a side view. The instrument panel 11 to which the instrument 12 is attached is fixed to a fixed base 13 attached to the engine body 14 in the front-rear direction and the vertical direction by a coil spring 15.

The instrument panel 11 has a substantially rectangular shape, and an upper edge portion thereof extends in the horizontal direction on the rear surface side and has a vertical coil spring 1.
A coil spring mounting member 16 to which 5 is mounted is provided. Then, in the widthwise intermediate portions at both ends of the coil spring attachment fitting 16, an upper coil spring attachment to which a horizontal coil spring 15 is attached while extending vertically downward with respect to the coil spring attachment portion 16 to face the instrument panel 11. A metal fitting 17 is provided. In addition, at both ends of the lower edge of the instrument panel 11, a mounting surface 18a that extends perpendicularly to the rear surface and that faces the instrument panel 11 is provided on the back surface side.
A lower coil spring mounting bracket 18 to which the horizontal coil spring 15 is mounted is provided on the mounting surface 18a.

The fixed base 13 is made of L-shaped steel, and the legs 13a provided at both ends are fixed to the engine main body 14 with bolts 19.
It is attached by fixing to. Then, the two fixed bases 1 attached in parallel to the engine body 14 in parallel.
A mounting plate 21 is bridged over the parts 3 and 13. Also,
At the upper end of each of the fixed bases 13, a coil spring mounting member 20 is provided which extends horizontally on the front surface side and to which a vertical coil spring 15 is mounted.

When the instrument panel 11 is attached to the attachment plates 21 of the fixed bases 13 and 13 by the vertical coil springs 15 and the horizontal coil springs 15, the coil spring attachment fittings 16 on the instrument panel 11 side and the coil springs on the fixed base 13 side are attached. The mounting bracket 20 faces each other, the upper coil spring mounting bracket 17 on the instrument panel 11 side and the mounting plate 21 of the fixed base 13 face each other, and is fixed to the mounting surface 18a of the lower coil spring mounting bracket 18 on the instrument panel 11 side. The mounting plate 21 of the base 13 is arranged to face each other.

Next, the coil spring 15 will be described in detail. FIG. 3 is an enlarged view of the vertical coil spring 15 when the instrument panel 11 is attached to the fixed base 13.
The coil spring 15 is composed of two coil springs, a first coil spring 15a and a second coil spring 15b, which have the same spring constant. And these two coil springs 15a, 1
5b has one adjustment stopper pin 25 inserted,
The spring seats 27, 28, 29 having a collar portion having an outer diameter slightly smaller than the inner diameter of the coil spring 15 and a seat portion abutting on the coil spring fittings 16, 20 and the head portion 25b of the adjusting stopper bin 25 are held in series.

The adjusting stopper pin 25 has a threaded portion 25a at its end portion with which a nut 26 is screwed,
At the other end, a large diameter portion 30 having an outer diameter slightly smaller than the inner diameter of the coil spring 15 and a head portion 25b having a diameter larger than this large diameter portion 30.
have. Further, a hole 16a having a diameter larger than the diameter of the adjustment stopper pin 25 is provided at a position where the coil spring 15 is mounted on the coil spring mounting bracket 16 on the instrument panel 11 side. Further, a hole through which the threaded portion 25a of the adjustment stopper pin 25 can pass is provided at the mounting position of the coil spring 15 in the coil spring mounting bracket 20 on the fixed base 13 side.

Then, the second coil spring 15b is provided in the hole 16a in the coil spring fitting 16 on the instrument panel 11 side.
Then, the adjustment stopper pin 25 to which the spring sheet 29 and the spring sheet 29 are sequentially attached is inserted. Further, the spring seat 2 is provided in the hole in the coil spring mounting bracket 20 on the fixed base 13 side.
8, the first coil spring 15a and the spring seat 27 are sequentially mounted, and the threaded portion 25a of the adjustment stopper pin 25 is inserted to screw the nut 26 into the threaded portion 25a. Thus, the coil spring mounting bracket 20 and the coil spring mounting bracket 16
While the first coil spring 15a is contracted through the seat portions of the spring seats 27 and 28 between the
The second coil spring 15b is contracted between the 6 and the head portion 25b of the adjustment stopper pin 25 via the seat portion of the spring seat 29.

Similarly, for the horizontal coil spring 15 as well, between the upper coil spring mounting member 17 (mounting surface 18a of the lower coil spring mounting member 18) on the instrument panel 11 side and the mounting plate 21 of the fixed base 13. First coil spring 15a
The second coil spring 15b is provided between the mounting plate 21 of the fixed base 13 and the head 25b of the adjustment stopper pin 25 while
Disguise.

At this time, for example, when the engine body 14 vibrates only in the left-right direction in FIG.
The fixed table 13 fixed to the table 4 vibrates in the front-back direction with respect to the instrument panel 11. Therefore, the fixed base 13
The coil spring mounting member 20 mounted on the instrument panel 11 also vibrates in the front-back direction with respect to the instrument panel 11, and the vertical adjustment stopper pin 25 also vibrates with respect to the coil spring mounting member 16 on the instrument panel 11 side. Therefore, as described above, the hole 16a provided in the coil spring fitting 16 on the instrument panel 11 side
The diameter of is larger than the diameter of the adjustment stopper pin 25,
The vibration of the adjustment stopper pin 25 is released. At this time, the distance between the hole 16a and the adjustment stopper pin 25 may be set based on the maximum amplitude of vibration of the engine body 14. The same applies to the hole for inserting the adjustment stopper pin 25 provided in the mounting plate 21 of the fixed base 13 described above.

In the vibration damping device for the instrument panel having the above structure,
By removing the nut 26 of the adjustment stopper pin 25, the first and second coil springs 15a and 15b can be removed. In this way, the coil spring 15 can be easily replaced with a coil spring having a different spring constant. Here, when the spring constant of the coil spring 15 is K and the weight of the instrument panel 11 is M, the natural frequency f of the coil spring 15 is proportional to (1 / 2π) (K / M) ^1/2 . Therefore, the natural frequency of the coil spring 15 is changed by changing the spring constant K of the coil spring 15 as described above.
The vibration-proof function can be effectively exhibited by keeping away from the vibration frequency of. At this time, in the case of the coil spring 15, no change in strength due to a change in spring constant is seen, unlike the case of the vibration-proof rubber. Therefore, the change of the spring constant is not restricted by the strength of the coil spring 15.

Further, by rotating the nut 26 of the adjusting stopper pin 25 to change the distance between the head 25b and the nut 26 of the adjusting stopper pin 25,
The mounting load of the coil spring 15 can be freely changed. Therefore, the amplitude amount of the instrument panel 11 can be optimally adjusted to effectively exhibit the anti-vibration function.

Further, in the vibration isolator of the instrument panel in this embodiment, the coil spring 15 is replaced by the first and second coil springs 1.
It is composed of two coil springs 5a and 15b, and the mounting plate 21 of the instrument panel 11 or the fixed base 13 is provided with both coil springs 15a and 15b
It is sandwiched between b. Therefore, when one coil spring extends, the other coil spring is compressed,
None of the coil springs 15a and 15b are fully extended by the vibration of the instrument panel 11. Therefore, the first,
It is prevented that the second coil springs 15a and 15b are repeatedly subjected to an axial pulling force and are cut and broken. Even if one coil spring 15a (15b) is cut, the other coil spring 15b (15a) that is not cut holds the instrument panel 11 and prevents the instrument panel 11 from falling.

As described above, in this embodiment, the instrument panel 11 is attached to the fixed base 13 of the engine body 14, and a vibration damping device for absorbing the vibration caused by the vibration force from the engine body 14 is provided. The coil spring 15 is composed of two coil springs, the first and second coil springs 15a and 15b, and the adjustment stopper pin 25. The first coil spring 15a is contracted between the coil spring mounting bracket 20 on the fixed base 13 side and the coil spring mounting bracket 16 on the instrument panel 11 side, while the coil spring mounting bracket 16 and the adjustment stopper pin 25 are arranged.
The second coil spring 15b is contracted between the head 25b and
Vibrations in the vertical direction are absorbed by the vertical coil spring 15. Further, the upper coil spring mounting bracket 17 (mounting surface 18a of the lower coil spring mounting bracket 18) on the instrument panel 11 side
And the mounting plate 21 of the fixed base 13 between the first coil spring 15
The second coil spring 1 is installed between the mounting plate 21 of the fixed base 13 and the head 25b of the adjustment stopper pin 25 while the a is compressed.
5b is contracted, and the horizontal coil spring 15 prevents vibration in the front-rear direction.

Therefore, by replacing the coil spring 15 with a coil spring having a different spring constant, the natural frequency of the coil spring 15 can be easily changed according to the vibration frequency of the engine body 14. Also, the adjustment stopper pin 2
5 by rotating the nut 26 of the coil spring 15
The mounting load of can be freely changed, and the amplitude amount of the instrument panel 11 can be optimally adjusted. Therefore, it is possible to effectively absorb the vertical and longitudinal vibrations of the instrument panel 11. Further, the first and second coil springs 15 that constitute the coil spring 15 are
a and 15b do not fully extend and do not lead to breakage. Even if one of the coil springs 15a (15b) is cut, the instrument panel 11 does not drop.

In the above embodiment, the vertical coil spring 15 and the horizontal coil spring 15 absorb the vertical vibration and the front-back vibration with respect to the instrument panel 11. However, the present invention is not limited to this, and by providing a horizontal coil spring 15 that absorbs lateral vibrations in FIG. 1, x, y,
If the vibration of z in the three axial directions is absorbed, the vibration damping effect can be more effectively exhibited. Further, in the above embodiment, the second coil spring 1 is provided between the head 25b of the adjustment stopper pin 25 inserted from the side of the instrument panel 11 side coil spring fitting 16 and the instrument panel 11 side coil spring fitting.
5b is disassembled, but the second coil spring 15b is provided between the nut 26 of the adjustment stopper pin 25 inserted from the side of the coil spring mounting bracket 20 on the fixed base 13 side and the coil spring mounting bracket on the instrument panel 11 side. May be disguised. In addition, the shape of the coil spring mounting bracket 16, the upper coil spring mounting bracket 17, the lower coil spring mounting bracket 18, and the coil spring mounting bracket 20 on the fixed base 13 on the instrument panel 11 side is limited to the shapes shown in FIGS. 1 to 3. It is not something that will be done.

[0026]

As is apparent from the above, the vibration isolator for the instrument panel of the invention according to claim 1 has the instrument panel side mounting bracket having the mounting surface extending in the horizontal direction, and the instrument panel side mounting bracket as described above. A fixed base side mounting bracket having a mounting surface facing the mounting surface, the instrument panel side mounting bracket installed so that the mounting surfaces face each other, and an adjustment stopper pin penetrating both the mounting surfaces of the fixed base side mounting bracket, The first coil spring, which is disassembled between one of the head and nut of the adjustment stopper pin and one of the mounting surfaces of the both mounting brackets, and the contraction between the mounting surfaces of the both mounting brackets. Since it has the mounted second coil spring, the mounting load of the first and second coil springs can be easily changed by rotating the nut. Further, it is possible to remove the nut and replace the first and second coil springs with coil springs having different spring constants.

Therefore, according to the present invention, the natural frequencies of the first and second coil springs for absorbing the vibration in the vertical direction are set in accordance with the vibration frequency of the vibrator main body, and The vibrations in the vertical direction can be effectively absorbed by freely changing the mounting loads of the first and second coil springs to optimally adjust the amplitude amount of the instrument panel.

According to a second aspect of the present invention, there is provided an instrument panel vibration isolator, comprising: an instrument panel side mounting bracket having a mounting surface extending in a predetermined direction; and a mounting surface facing the mounting surface of the instrument panel side mounting bracket. Fixing base side mounting bracket, adjusting stopper pin, 1st
Of the coil spring and the second coil spring is extended at least in a direction perpendicular to the set in which the mounting surface of the instrument panel-side mounting bracket extends in the horizontal direction and substantially parallel to the instrument panel surface. Since there are two existing sets, by optimizing the natural frequencies and mounting loads of the first and second coil springs of the above two sets, at least vertical and front-back vibrations are effective. Can be absorbed.

[Brief description of drawings]

FIG. 1 is a front view of an instrument panel to which a vibration damping device of the present invention is applied.

2 is a side view of the instrument panel shown in FIG. 1. FIG.

FIG. 3 is an enlarged view of the coil spring in FIGS. 1 and 2.

FIG. 4 is a view showing a conventional vibration damping device for a dashboard.

5 is an enlarged view of the vibration isolation device shown in FIG.

[Explanation of symbols]

11 ... Instrument panel, 13 ... Fixed base, 1
4 ... Engine body, 15, 15a, 15b ...
Coil spring, 16, 17, 18, 20 ... Coil spring mounting bracket, 21 ... Mounting plate, 25 ... Adjusting stopper pin, 26 ... Nut, 2
7, 28, 29 ... Spring sheets.

Claims (2)

[Claims] 1. A vibration control device for a dashboard, which absorbs vibrations caused by a vibration force from a vibrator main body and prevents the vibrations from being transmitted to the dashboard, and which has a mounting surface extending in a horizontal direction. , The instrument panel side mounting bracket installed on the instrument panel and the mounting surface facing the mounting surface of the instrument panel side mounting bracket, and the fixed table side mounting installed on the fixed table to which the instrument panel is fixed The metal fitting, the instrument panel side mounting metal fitting and the fixed base side mounting metal fitting that are installed so that the mounting surfaces face each other penetrate through the holes formed in both the mounting surfaces, and a nut is screwed at one end. While the screw portion is provided, the other end is provided with an adjusting stopper pin having a large-diameter head, and the head of the adjusting stopper pin is in a state of penetrating the holes formed in the mounting surfaces of the two mounting brackets. On either part or nut A first coil spring, which is compressed between one of the mounting surfaces of both mounting brackets, and a second coil spring, which is contracted between the mounting surfaces of both mounting brackets in a state of being penetrated by the adjustment stopper pin. An instrument panel anti-vibration device having a coil spring. 2. An antivibration device for a dashboard, which absorbs vibration caused by an exciting force from a vibrator main body and prevents the vibration from being transmitted to the dashboard, which has a mounting surface extending in a predetermined direction. , The instrument panel side mounting bracket installed on the instrument panel and the mounting surface facing the mounting surface of the instrument panel side mounting bracket, and the fixed table side mounting installed on the fixed table to which the instrument panel is fixed The metal fitting, the instrument panel side mounting metal fitting and the fixed base side mounting metal fitting that are installed so that the mounting surfaces face each other penetrate through the holes formed in both the mounting surfaces, and a nut is screwed at one end. While the screw portion is provided, the other end is provided with an adjusting stopper pin having a large-diameter head, and the head of the adjusting stopper pin is in a state of penetrating the holes formed in the mounting surfaces of the two mounting brackets. On either part or nut A first coil spring, which is compressed between one of the mounting surfaces of both mounting brackets, and a second coil spring, which is contracted between the mounting surfaces of both mounting brackets in a state of being penetrated by the adjustment stopper pin. A set consisting of a coil spring, at least a set in which the mounting surface of the instrument panel-side mounting bracket extends in the horizontal direction and a set in which the set surface extends in a vertical direction and substantially parallel to the face of the instrument panel. The instrument panel anti-vibration device is characterized by having two sets of