JP2001158378A - Vibration absorber and tractor vibration absorber using the same - Google Patents

Abstract

(57) [Summary] [Problem] Conventional dynamic damper (vibration absorber)
Are expensive and structurally complex, so they offer inexpensive ones. SOLUTION: The vibration absorber 12 according to the present invention has a gap 14 between a cylindrical holder 13 and an inner peripheral surface 13A of the holder 13, and a rod-shaped weight member housed in the holder 13 is provided. 15 and an elastomer 16 interposed between the skimmers 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration absorber (dynamic damper) and a tractor vibration absorber using the same.

[0002]

2. Description of the Related Art In a tractor, there are vibration problems such as engine vibration and running vibration, and not only vibration characteristics of a human body such as a driver's whole body vibration and local vibration (hand-arm vibration), but also a malfunction of each part and a cause of damage. It has become. For this reason, the cabin of the tractor is independently suspended by a rubber mount, and the resonance point of vibration is changed to a fender etc. (displacement)
For example, provision of a weight (mass member) to take measures has been taken.

[0003]

However, in the prior art, the reduction of vibration and muffled sound (vibration absorption, vibration reduction, etc.) is somewhat insufficient, and the structure (configuration) is complicated and the cost is high. Was. Therefore, an object of the present invention is to provide a vibration absorber (dynamic damper) that can reliably reduce vibration and muffled sound while having a simple configuration, and a vibration absorber for a tractor using the same.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a vibration absorber (dynamic damper) according to the present invention is provided.
Is a cylindrical holder 13 and an inner peripheral surface 13 of the holder 13.
A is provided with a bar-shaped weight member 15 provided inside the holder 13 with a gap 14 between the gap A and the elastomer 16 and an elastomer 16 interposed between the gap 14. Claim 1). By adopting such a configuration, not only the resonance point of vibration can be changed (displaced) by the mass of the bar-shaped weight member 15 but also the transmission of vibration in a specific frequency range by the elastomer 16 can be reduced, while having a simple configuration. Can be played.

In the first aspect of the present invention, it is recommended that a cap 17 is attached to an end of the cylindrical holder 13 to restrict the movement of the bar-shaped weight member 15 in the bar longitudinal direction. (Claim 2),
Further, it is recommended that the cap 17 is made of an elastomer material and elastically restricts the movement of the rod-shaped weight member 15 in the rod longitudinal direction (claim 4). By forming the cap 17 from an elastomer material in this manner, it is possible to reliably reduce vibration transmission in a specific frequency range due to the movement of the bar-shaped weight member 15 in the bar longitudinal direction. Further, the cap 17 has a waterproof function. (Claim 5).

In the first aspect of the present invention, it is sufficient that the elastomer 16 can elastically support the bar-shaped weight member 15 with the gap 14 interposed therebetween. It is recommended that the O-ring is mounted with a gap in the direction (claim 3). By adopting such a configuration, a circumferential groove (O-ring mounting groove) is formed in the rod-shaped weight member 15, and the O-ring is mounted in the circumferential groove, and the interior (assembly) to the cylindrical holder 13 is performed. It becomes easy.

Further, the present invention relates to a vibration absorbing device for a tractor in which a support such as a frame 9H of a cabin 9 or a safety frame is supported on a support 18 attached to a vehicle body 4. The following technical measures have been taken to achieve the objectives. That is, a vibration absorbing device for a tractor according to claim 6 is characterized in that the vibration absorbing body 12 according to claims 1 to 5 is mounted on the support base 18. The vibration absorbing device for a tractor according to 7 includes:
The support base 18 extends outward from the vehicle body 4,
The vibration absorber 12 according to any one of claims 1 to 5 is mounted on the extension end side of the support base 18, and thus the vibration absorber 12 is attached to the outside of the support base 18. The vibration absorption function could be improved by mounting it in the area.

Further, the vibration absorber 12 is supported on a support base 18.
Although it is possible to mount the vibration absorber 12 on the upper surface side, it is recommended that the vibration absorber 12 be housed and mounted on the lower surface side of the support base 18 (claim 8). Further, the vibration absorber 12 can be mounted with its rod-shaped longitudinal direction as the left-right direction of the tractor body 4.
It is recommended that the tractor body 4 is mounted with its rod-shaped longitudinal direction as the front-back direction of the tractor body 4.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 6 shows a tractor using the vibration absorber according to the present invention, and the tractor 1 is exemplified by a two-axis four-wheel type having left and right front wheels 2 and left and right rear wheels 3. Is constituted by an engine 5, a clutch housing and a transmission case 6 provided at the rear of the engine 5, and the engine 5 is mounted in an engine room in a hood 7.

The tractor 1 shown in FIG. 6 is a tractor with a cabin that surrounds (surrounds) a driving control device 8 constituted by arranging a control handle 8A and a driver's seat 8B back and forth by a cabin 9. Reference numeral 9 denotes a skeleton body having left and right front columns 9A, left and right rear columns 9B, and left and right intermediate columns 9C erected on the left and right fenders 10. 9D, a front panel (front glass), a side panel (side glass) 9E, a rear panel (rear glass), a ceiling 9F, and the like. ing.

The vibration absorber 12 and the vibration absorber using the same according to the present invention are employed for rubber mounts of left and right front supports (including a step 9H which is a part of a skeleton and a floor sheet). . As shown in FIG. 1 (2), the vibration absorber 12 according to the present invention has a cylindrical holder 1.
4 and a rod-shaped weight member 15 provided inside the holder 13 with the gap 14 shown in FIG. 4 between the inner peripheral surface 13A of the holder 13 and a rod-shaped weight interposed in the gap 14 An elastomer (vibration absorber) 16 is provided for elastically supporting (elastically supporting) 15.

The holder 13 is formed in a cylindrical shape, and caps 17 are removably attached to the openings at both ends thereof. As shown in FIG. 1 (2) and FIG. The cap 1 includes an insertion shaft portion 17A and a flange portion 17B which are fitted into the openings at both ends of the cap 1.
7 is mounted on the holder 13 and the rod-shaped weight member 15 contained in the holder 13 is moved in the bar longitudinal direction (extraction).
Is regulated. For this reason, the cap 17 can be made of metal (aluminum alloy or the like).
In order to elastically restrict the movement of 5, it is advantageous from the viewpoint of vibration absorption to make it from an elastomer material such as rubber or resin.

Elastomer 16 interposed between skimmers 14
The rod-shaped weight member 15 may be formed in a tube shape made of an elastic material such as rubber or resin, which is fitted over the entire (full length) of the rod-shaped weight member 15. It is preferable to form the ring-shaped elastomer 16 by an O-ring fitted into the circumferential groove 15A. In FIG. 1 (2), the circumferential groove 15A is formed at both ends of the rod-shaped weight member 15, but may be formed at the center portion. Although one of the caps 17 may be formed in a closed bottomed holder with one end of the holder 13 closed, and one of the caps 17 is mounted in the opening,
Has a waterproof sealing function for the inside of the holder 13.

The vibration absorber 12 having such a configuration
Is to displace the resonance point of the vibration due to the increase in the mass of the rod-shaped weight member 15 (preferably made of metal such as steel or lead having a large specific gravity in this sense),
The vibration support in the specific frequency range can be reduced by the resilient support by 6. For this reason, when the holder 13, the rod-shaped weight member 15, and the cap 17 are formed into a rectangular tube, the rod-shaped weight portion 15 is formed to have a square axis so that the holder 13 can be housed therein. Design changes are free.

The vibration absorber 12 according to the present invention is used at the step 9H, which is the skeleton of the cabin 9 shown in FIG. Of course, it is also possible to use the column of the safety frame at the portion where the rubber mount is provided. FIG. 1 (1), FIG.
Referring to FIG. 3, a support base 18 for mounting the rubber mount 11 is mounted on the left and right vertical surfaces (side walls) of the tractor body 4 so as to project outward on the horizontal plane in the left and right direction.

As shown in FIG. 1, the left and right support bases 18 are plate-shaped (flange-shaped) mounting substrates 18A and box-shaped mounting portions 18B having lower openings 18C fixed to the mounting substrates 18A by welding or the like. And is configured with
The mounting substrate 18A is detachably fastened to the vehicle body 4 by a plurality of bolts 19, and thus the mounting substrate 18A
Is provided with a bolt insertion hole 18D. The mounting portion 18B has a flat top plate 18F fixed between the front and rear side plates 18E having a strip shape, and a closing plate 18 at the horizontal extending end.
G is fixed, and a mounting hole 18H for the rubber mount 11 is formed in the top plate 18F.
E has a mounting hole (mounting hole) 18I for the vibration absorber 12.

As shown in FIG. 3, the rubber mount 11 includes a pair of ring-shaped anti-vibration rubbers 20 having a cylindrical boss portion 20A having an outer shape capable of being fitted into the mounting hole 18H.
Each of the vibration-isolating rubbers 20 is mounted (interior) in a dish-shaped receiver 21.
1 through the pair of anti-vibration rubbers 20 and the cylindrical sleeve 2
By inserting fasteners 23 shown by bolts and nuts into the cylindrical sleeve 22 and tightening the fasteners in the vertical direction, the support base 18 is provided with a cabin framework (step or floor sheet 9H in the figure) or a support of a safety frame. It is rubber-mounted via a vibration-proof rubber 20.

In this rubber mount 11, as shown in FIG. 5, one or more ring-shaped washers 24 serving as additional weights are interposed below the fastener
When tightened at 3, the resonance point of vibration can be displaced downward due to the increase in mass by the washer 24, which is effective in terms of vibration isolation. The vibration absorber 12 according to the present invention, when mounted on the support base 18, constitutes a vibration absorber that exhibits a vibration reduction effect in combination with the rubber mount 11. For this reason, mounting pieces 25 which are welded to the back nut 25A are fixed to both ends of the holder 13, and the nut portions (mounting holes) of the pair of mounting pieces 25 are inserted so as to match the mounting holes 18I. Then, it is mounted by the fasteners (bolts) 26 shown in FIGS.

The vibration absorber 12 can be mounted on any one of the upper surface, front and rear surfaces, and a free end (extended end) of the support base 18, but is accommodated and mounted in the lower opening 18C of the support base 18. It is desirable. More specifically, the cap 17 of the vibration absorber 12 is attached (mounted) by tightening the attachment piece 25 with the fastener 26 with the cap 17 in contact with each inner surface of the front and rear side plates 18E. By adopting such a mounting form, the detachment of the cap 17 can be prevented by the side plate 18E, so that the waterproof function can be reliably maintained, and the axial direction of the rod-shaped weight member 15 can be mounted in the front-rear direction to exchange (replace). This is advantageous in terms of maintenance such as.

It is desirable that the vibration absorber 12 is mounted on the extension end side of the support base 18. That is, the tractor body 4
By mounting it on the far side, the vibration reduction effect works more effectively. Further, since the vibration absorbing function varies depending on the mass (weight) of the vibration absorber 12 and its mounting position, and the vibration range varies widely, as shown in FIG. With such a configuration, the mounting position of the vibration absorber 12 can be advantageously adjusted according to the vibration source.

Of course, the mounting position of the vibration absorber 12 can be adjusted steplessly within the range of the elongated hole by forming the elongated hole 18H into an elongated shape in the extending direction (left-right direction). Further, in FIG. 2, the mounting piece 25 is directed inward (toward the vehicle body), but may be freely mounted outward (toward the extended end). FIGS. 7A and 7B are perspective views of the rear panel (rear glass) 9I of the cabin 9 shown in FIG. The rear panel 9I can be opened and closed (hatchback) by a fluid damper or the like by a hinge provided on the ceiling 9F.

The tractor 1 has a three-point link at a rear portion thereof, and a working machine is mounted to be able to move up and down via an automatic hitch in which the links of the three-point link are standardized. When the work machine is lifted, depending on the type of auto hitch, there is a possibility that the lifting height may be reduced due to interference with the rear panel 9I. That is, the rear panel 9I shown in FIG. Therefore, as shown in FIG. 7 (2), at the center of the rear panel 9I in the left-right direction and below,
By forming the curved depression 9J, interference with the automatic hitch is avoided and the lifting height of the working machine is ensured.

[0023]

According to the present invention, a vibration absorber effective for a vibration absorbing (vibration reduction) function can be provided at a low cost in spite of its simple configuration, and vibration (noise) can be provided by a vibration absorbing device using the same. ), The driver's fatigue and damage to each part can be suppressed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a vibration absorber according to the present invention, and FIG. 1B is an exploded perspective view of a vibration absorber.

FIG. 2 is a bottom view of the vibration absorbing device according to the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a BB enlarged view of FIG. 3;

FIG. 5 is a sectional view showing another example of the rubber mount.

FIG. 6 is an overall side view of the tractor.

FIGS. 7A and 7B are a perspective view and a plan view of a rear glass which is a conventional example, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tractor 9 Cabin 12 Vibration absorber 13 Holder 14 Skimmer 15 Bar-shaped weight member 16 Elastomer (vibration absorber) 17 Cap

Claims (9)

[Claims] 1. A rod-shaped weight which has a gap (14) between a cylindrical holder (13) and an inner peripheral surface (13A) of the holder (13) and is housed in the holder (13). A vibration absorber comprising: a member (15); and an elastomer (16) interposed in the gap (14). 2. A cap (17) is attached to an end of a cylindrical holder (13), and the cap (17) restricts movement of the bar-shaped weight member (15) in the bar longitudinal direction. The vibration absorber according to claim 1, wherein: 3. An O-ring mounted on the outer peripheral surface of the rod-shaped weight member with an interval in the longitudinal direction of the rod.
The vibration absorber according to any one of the above. 4. The cap according to claim 2, wherein the cap (17) is made of an elastomer material and elastically restricts the movement of the rod-shaped weight member (15) in the rod longitudinal direction. Vibration absorber. 5. The vibration absorber according to claim 2, wherein the cap (17) has a waterproof function. 6. A support (18) attached to a vehicle body (4).
A vibration absorber for a tractor that supports a skeleton (9H) of a cabin (9) or a support such as a safety frame, wherein the support base (18) is a vibration absorber according to any one of claims 1 to 5. A vibration absorber for a tractor, comprising an absorber (12). 7. A support (18) attached to a vehicle body (4).
A tractor vibration absorber for supporting a skeleton (9H) of a cabin (9) or a support such as a safety frame, wherein the support base (18) is extended outward from the vehicle body (4). And at the extending end side of the support base (18).
A vibration absorber for a tractor, wherein the vibration absorber (12) according to (1) is mounted. 8. The vibration absorber (12) includes a support (18).
The tractor vibration absorbing device according to claim 6, wherein the tractor is accommodated and mounted on a lower surface side of the tractor. 9. The vibration of a tractor according to claim 6, wherein the vibration absorber (12) is mounted so that its rod-shaped longitudinal direction is the front-rear direction of the tractor body (4). Absorber.