JPH0656052A - Anti-vibration support structure for seats in industrial vehicles - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to suppress the vibration transmitted to the driver through the seat without changing the height of the seat mounting part. [Structure] A front bracket 4 is disposed in an inner space of a front portion 2a of a top cover. Horizontal part 4b of the bracket 4
An insulator is attached to the. The insulator penetrates the vibration isolating member 7 through the horizontal portion 4b, and the four corners of the insulator are screwed from the lower side by mounting bolts 8 to be mounted. The vibration isolating member 7 of the insulator 5 includes a vibration isolating rubber 7c between an outer cylinder 7a and an inner cylinder 7b arranged concentrically.
And the outer cylinder 7a is fixed to the plate 6, and the inner cylinder 7a
The lower end portion of b is projected downward to form a central protruding portion. Further, the mount rubber plate 9 is fixed to the upper surface of the side frame 1 which comes into contact with the insulator when the top cover 2 is closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration support structure for a seat in an industrial vehicle such as a forklift.

[0002]

2. Description of the Related Art Conventionally, a mounting structure for preventing vibration of an engine or the like and vibration from a road surface during traveling from being transmitted to a driver through a body of a vehicle is, for example, an actual open shovel 61-5257.
The one described in Japanese Patent Publication No. 4 is known. This is because the cab body that is integrally formed with the overhead guard and the top panel on the floor is attached to the upper part of the side frame that constitutes the body of the body via cushioning material, so that it can be transmitted directly from the body to the cab body. The generated vibration is absorbed by the cushioning material to reduce the vibration, and the vibration transmission to the driver sitting on the seat provided in the cab is suppressed.

In the conventional industrial vehicle, the seat is rigidly attached to the floor inside the cab or the upper portion of the side frame, and the outer surface is attached to the upper surface of the box-shaped top cover.

[0004]

However, in the above mounting structure, when the driver grips the pillar portion of the cab and gets in and out of the vehicle body, the entire cab is not flexed and there is no sense of stability. However, the structure is complicated and the cost is high. There is also a method of suppressing vibrations to the driver by providing a vibration isolation mechanism between the top cover attached to the body of the vehicle and the seat, but the seat attachment position is increased by the amount of the vibration isolation mechanism and the stability is improved. However, there is a problem in that the head clearance cannot be secured as well as it becomes worse.

The present invention has been made in view of the above problems, and an object thereof is to suppress the vibration transmitted to the driver through the seat without changing the height of the seat mounting portion. I am trying.

[0006]

In order to achieve the above-mentioned object, a vibration isolating support structure for a seat in an industrial vehicle according to the present invention is provided with a top cover projecting upward on the upper part of a vehicle body, and the top cover is attached to the top. In an industrial vehicle in which a seat is attached to the upper surface of the cover, the top cover is attached to the vehicle body via a buffer.

For example, in an industrial vehicle in which the rear portion of the top cover is attached to the vehicle body via a hinge,
It is preferable that a rear supporting bracket having a shaft up and down is provided upright from the body of the vehicle body, and the mounting portion of the hinge on the vehicle body side is connected to the upper portion of the bracket through a vibration-proof rubber that is a buffer. At this time, the body-body-side mounting portion of the hinge is connected to the upper portion of the rear supporting bracket via a vibration-proof rubber, and the members of the body-body-side mounting portion that are involved in the connection are extended downward to extend the extension portion. When the lower portion is swingably connected to the lower portion of the rear supporting bracket or a second rear supporting bracket fixed to the vehicle body separately from the rear supporting bracket via a second vibration-proof rubber. Good.

In an industrial vehicle in which the rear portion of the top cover is attached to the body of the vehicle through a hinge, the front bracket has a horizontal portion which is fixed inside the front portion of the top cover and whose lower surface is horizontally arranged. A central protruding portion that is attached to the horizontal portion of the bracket via a vibration-proof rubber and that protrudes below the horizontal portion; and the central protruding portion has a predetermined distance in the vehicle body left-right direction. A stopper attached to a horizontal portion and protruding downward and fixed to the upper surface of the vehicle body, when the top cover is closed, the upper surface abuts the central protruding portion and the side surface is laterally predetermined with the stopper. And a mount rubber plate having a height higher than the amount of protrusion of the stopper from the horizontal portion, and a cushioning member is interposed between the front end portion of the top cover and the abutting portion of the vehicle body. There.

[0009]

[Operation] By attaching the top cover to which the seat is attached to the body of the vehicle through the cushioning material, the vibration transmitted from the road surface or the drive unit to the body of the vehicle is transmitted to the top cover through the attaching portion and the abutting portion. When an input is attempted, the shock absorbers provided in the mounting portion and the abutting portion absorb the above-mentioned vibration, and the vibration input to the top cover is reduced, so that the vibration input to the seat attached to the top cover is reduced. Also becomes smaller.

According to the present invention, only the top cover is vibration-isolated instead of vibration-proofing the entire cab as in the prior art, so that the structure is simpler and the cost is lower than in the prior art. In the case of a top cover that can be opened and closed, the rear part is attached to the body frame side member such as the side frame via a hinge, but it can be transmitted from the vehicle body by attaching the body side attachment part of the hinge via a vibration isolation rubber. The generated vibration is absorbed by the anti-vibration rubber, so that the vibration transmitted to the top cover via the hinge, which is an attachment part, is reduced.

At this time, when the rear supporting bracket is erected from the body of the vehicle body and is connected to the hinge via the anti-vibration rubber at the upper portion thereof, the height of the rear supporting bracket is set to a predetermined height. The hinge can be mounted on the vehicle body side at an optimum position via the rubber anti-vibration, for example, the mounting height of the hinge can be arranged horizontally with the upper surface of the top cover. Here, in the above-mentioned mounting structure, when a rotational moment is generated in the anti-vibration rubber, the body-body-side mounting portion of the hinge may fall forward. However, by adopting the structure according to claim 4, the extension is achieved. Since the lower portion of the hinge regulates the collapse via the second anti-vibration rubber, the body-body-side mounting portion of the hinge is prevented from falling more than a predetermined amount.
It is possible to prevent the top cover from being attached to the rear portion of the top cover from tilting to the front side and twisting left and right.

Further, in the openable and closable top cover, in a normal state, that is, in the closed state, the lower end surface of the front portion abuts on the upper surface of the vehicle body, and the structure of the abutting portion is buffered as described in claim 3. When the body is interposed, the vibration transmitted to the vehicle body is transmitted to the central projecting portion via the mount rubber plate, and is input from the central projecting portion to the top plate via the anti-vibration rubber and the front bracket. However, the vibration damping rubber absorbs the vibration and the vibration input to the top plate is reduced.

When a lateral force is input to the vehicle body due to a sudden turn or the like, the anti-vibration rubber bends and the front portion of the top plate tends to be displaced laterally. The rubber plate is contacted with the stopper, and is regulated so as not to be displaced more than a displacement amount set by the clearance between the anti-vibration rubber and the stopper, the shape of the anti-vibration rubber, or the like.

[0014]

Embodiments of the present invention will be described with reference to the drawings.
First, the configuration will be described. As shown in FIG. 1, top covers 2 are attached to the upper portions of the left and right side frames 1 that extend in the vehicle front-rear direction and form a part of the vehicle body. Seat 3 is attached.

The top cover 2 is in the shape of a box with an open bottom as shown in FIG. 2, and has a front portion 2a and a rear portion 2b.
The left and right portions of each are attached to the side frame 1. Front brackets 4 are provided in the inner spaces of the left and right portions of the front portion 2a of the top cover 2, respectively.

As shown in FIGS. 2 and 3, the front bracket 4 has an upper portion fixed to the upper inner surface of the top cover front portion 2a and a lower portion forming a horizontal rectangular plate-shaped horizontal portion 4b. The tip portion 4c of the horizontal portion 4b is fixed by abutting against the inner surface of the tip portion of the top cover 2. The horizontal part 4b
Has a circular through hole with its axis vertically arranged at its center, and has bolt holes at its four corners.

A front insulator 5 is attached to the horizontal portion 4b from below. That insulator 5
Of the rectangular plate 6 has a vibration isolating member 7 projecting upward from the center thereof. The vibration isolating member 7 is inserted into the through hole of the horizontal portion 4b, and the four corners are attached from the lower side to the mounting bolts 8 respectively. It is attached by screwing. The vibration isolating member 7 of the insulator 5 has a vibration isolating rubber 7c interposed between an outer cylinder 7a and an inner cylinder 7b, which are concentrically arranged with their axes vertically and the outer cylinder 7a is attached to the plate 6. The inner cylinder 7b is fixed and the lower end of the inner cylinder 7b slightly projects downward to form a central protruding portion.

The above-mentioned 4 projecting downward from the plate 6
The head of one mounting bolt 8 constitutes a stopper. Also,
A rectangular parallelepiped mount rubber plate 9 made of anti-vibration rubber is fixed to the upper surface of the side frame 1 which comes into contact with the insulator 5 when the top cover 2 is closed. The height h1 of the mount rubber plate 9 from the upper portion of the side frame 1 is the height h of the head of the mounting bolt 8.
2 and has a predetermined horizontal clearance δ between the head of the mounting bolt 8 and the mount rubber plate 9 when the top cover 2 is closed, as shown in FIG. It is arranged so that it is located.

To attach the rear portion 2b of the top cover 2, as shown in FIGS. 5 and 6, one of the metal fittings 10a sandwiching the pin 10b of the hinge 10, which is an opening / closing metal fitting, is arranged on the left and right sides of the rear portion 2b. It is screwed to the rear portion 2b of the top cover 2 by a bolt 11. The hinge 10 extends rearward, and a rear mounting bracket 12 for fixing the rear insulator 11 is fixed to the other metal fitting 10c sandwiching the pin 10b.

A through hole is formed in the lower portion of the mounting bracket 12 so that the mounting bolt 13 can penetrate therethrough, and the mounting bracket 12 is provided with a rear insulator 11 from below.
Are abutted. The rear insulator 11 is configured by connecting an inner cylinder 11c and an outer cylinder 11a, which are doubly arranged at a predetermined interval, via a vibration-proof rubber 11b, and the inner cylinder 11c has a shaft. Bolt 1 up and down
3 is inserted from below, and further penetrates through the through hole of the mounting bracket 12 and is screwed into a nut 14 provided on the bracket 12, whereby the mounting bracket 12
A rear insulator 11 is attached to the.

Also, the outer cylinder 11 of the rear insulator 11
A flange 11d is provided on the outer periphery of a, and the flange 11d is fixed to the upper portion of the rear supporting bracket 15 which is erected on the upper portion of the side frame 1 which is a part of the vehicle body. The top cover 2 attached as described above can be opened and closed by pivoting up and down about the pin 10b of the hinge 10 as a rotation axis, and a well-known pressing mechanism (not shown) for pressing the front portion 2a downward when the hinge 10 is closed. Have A seat 3 is attached to the top of the top cover 2.

By attaching the top cover 2 as described above, the rear attachment portion of the top cover 2 is in a state of being attached to the side frame 1 via the vibration isolating rubber 11b of the rear insulator 11. Also, the top cover 2
When the front bracket 4 is closed, that is, when the front portion of the top cover 2 and the side frame 1 are in contact with each other in a normal state,
Only the inner cylinder 7b of the front insulator 5 fixed to the side insulator 1 is in contact with the mount rubber plate 9 fixed to the side frame 1. At this time, since the height of the mount rubber plate 9 is higher than the height of the head of the mounting bolt 8, the head of the mounting bolt 8 is mounted on the side frame 1.
Does not come into contact with the upper part of.

As a result, even if vibration transmitted to the vehicle body from the drive unit such as the engine or the road surface is about to be input to the top cover 2 via the side frame 1, the insulators 5, 5 arranged at the rear and front portions. 11 absorbs the vibration, and thus the vibration transmitted to the seat 3 via the top cover 2 is reduced. That is, at the rear mounting portion, the vibration transmitted to the side frame 1 is
Rear insulator 1 via rear support bracket 15
1 is transmitted to the outer cylinder 11a, but the vibration isolating rubber 11b fixed to the outer cylinder 11a absorbs the vibration and is transmitted to the inner cylinder 11c fixed to the inside of the vibration isolating rubber 11b. The vibration is reduced, and thus the vibration input to the top cover 2 and the seat 3 from the rear mounting portion of the top cover 2 mounted via the rear insulator 11 is suppressed to be small.

At the contact portion of the front portion 2a of the top cover 2 with the side frame 1, the vibration transmitted to the side frame 1 is transmitted to the inner cylinder 7b of the front insulator 7 via the mount rubber plate 9. Although transmitted, the vibration-proof rubber 7c fixed to the outside of the inner cylinder 7b absorbs the vibration and reduces the vibration transmitted to the outer cylinder 7a fixed to the outside of the vibration-proof rubber 7c. Therefore, the front insulator 5
Vibrations input from the front portion of the top cover 2 to the top cover 2 and the seat 3 via the are suppressed to be small.

In the mounting structure of the top cover 2 described above, the front portion 2a is arranged so that the front insulator 5 fits in the space inside the top cover 2, and the rear portion has a high hinge 10 mounting portion. By setting the height of the rear support bracket 15 so that the height does not become higher than the conventional one, the height of the upper portion of the top cover 2 becomes the same as that of the conventional one. The mounting height of the seat 3 to be mounted can be set to the same height as the conventional one.

Further, in the mounting structure of the top cover 2 as described above, a lateral force is input to the vehicle body due to a sudden turn of the vehicle or the like, and the antivibration rubber 7c of the insulator 5 provided on the front portion 2a of the top cover 2 is laterally moved. Even if the front cover 2 is displaced in the lateral direction and the front portion 2a is displaced laterally beyond the set value, if the displacement exceeds the set value, the side surface of the head of the mounting bolt 8 fixed to the side of the top cover 2 is the side frame 1.
The displacement is regulated by coming into contact with the side surface of the mount rubber plate 9 fixed to, and the displacement is regulated so as not to be displaced laterally beyond a set value.

This displacement amount is aimed by a simple means of appropriately selecting the clearance between the top cover 2 and the head of the mounting bolt 8 and the shape of the contact portion of the top cover 2 with the mounting bolt 8. The displacement amount can be set.
In the above embodiment, the mount rubber plate 9 is capable of contacting the heads of the mounting bolts 8 located on the left and right to restrict the displacement of the front end portion of the top plate 2 in the left-right direction.
The mount rubber plate 9 may be formed in a cross shape so as to be interposed between the mounting bolts 8 facing each other in the front-rear direction with a predetermined clearance, so that the displacement in the front-rear direction may be restricted.

Next, the second embodiment will be described. Second
Mounting of the rear portion 2b of the top cover 2 in the embodiment is
As shown in FIG. 7, one metal fitting 10 in which a pin 10b of a hinge 10 which is an opening / closing metal fitting is sandwiched on the left and right of the rear portion 2b, respectively.
a is fixed to the rear portion 2b of the top cover 2 by bolts. The hinge 10 extends rearward,
A rear mounting bracket 12 for fixing the rear insulator 11 to the other metal fitting 10c sandwiching the pin 10b.
Is fixed.

A through hole is formed in the lower part of the mounting bracket 12 so that the mounting bolt 13 can penetrate therethrough, and the mounting bracket 12 is provided with a rear insulator 11 from below.
Are abutted. The rear insulator 11 is configured by connecting an inner cylinder 11c and an outer cylinder 11a, which are doubly arranged at a predetermined interval, via a vibration-proof rubber 11b, and the inner cylinder 11c has a shaft. The upper and lower shafts 20 are inserted from below, and the mounting bracket 12
The inner cylinder 11c is sandwiched between the mounting bracket 12 and the step portion 20a of the shaft 20 by being screwed into the nut 14 provided on the bracket 12 through the through hole of the rear insulator 11. Installed.

The outer cylinder 11 of the rear insulator 11
A flange 11d is provided on the outer periphery of a, and the flange 11d is fixed to the upper portion 15a of the rear supporting bracket 15 which is erected on the upper portion of the side frame 1 which is a part of the vehicle body. The shaft 20 extends downward, and a second rear insulator 21 is attached to the lower end portion 20b of the shaft 20.

The second rear insulator 21 is composed of an inner cylinder 21c and an outer cylinder 21a which are doubly arranged at a predetermined interval and are connected to each other through a vibration-proof rubber 21b. The inner peripheral surface of the cylinder 21c is fitted to the outer periphery of the lower portion of the shaft and is fixed to the lower end portion 20b of the shaft 21. Then, the second rear insulator 21
The second rear insulator 21 is coaxially inserted into the insertion hole 22a of the guide plate 22 having an insertion hole 22a into which the outer cylinder 21a can be inserted.
The guide plate 22 is horizontally fixed to the lower portion of the rear support bracket 15.

By adopting the mounting structure of the rear portion 2b of the top cover as described above, when a turning moment is generated in the rear insulator 11 due to a sudden turn or the like, and the shaft 20 tries to incline, the lower end portion 2 of the shaft 20 will be inclined.
0b comes into contact with the insertion hole 22a of the guide plate 22 via the second rear insulator 21 to prevent the shaft 20 from tilting more than a predetermined amount.

As a result, it is possible to suppress twisting of the top cover 2 to the left and right and tilting forward caused by tilting of the shaft 20. Other configurations, operations, and effects are similar to those of the first embodiment. In the above embodiment, the lower end portion 20b of the shaft 20 is also
Similar to the upper side, they are connected to the same rear supporting bracket 15, but a second rear supporting bracket may be provided for connecting the lower end portion 20b.

[0034]

As described above, the antivibration support structure for a seat in the industrial vehicle of the present invention reduces the vibration input to the seat from the vehicle body without increasing the seat mounting height. It is possible to suppress the discomfort caused by the vibration of the driver and the adverse effect on the driving operation.

Further, even if a large lateral force is input to the vehicle body due to a sudden turn or the like and the top cover is displaced leftward or rightward, the displacement is predetermined by abutting the mount rubber plate on the stopper. The value can be regulated.

[Brief description of drawings]

FIG. 1 is a side frame in an embodiment according to the present invention,
It is a side view which shows the positional relationship of a top cover and a sheet.

FIG. 2 is a perspective view showing a top cover according to an embodiment of the present invention.

FIG. 3 is a side view showing the contact structure of the front end portion of the top cover of the embodiment according to the present invention with the side frame.

FIG. 4 is a bottom view of FIG.

FIG. 5 is a side view showing a mounting structure of a rear end portion of a top cover according to an embodiment of the present invention.

FIG. 6 is a perspective view showing a mounting structure of a rear end portion of a top cover according to an embodiment of the present invention.

FIG. 7 is a side view showing an attachment structure of the top cover of the embodiment according to the present invention.

[Explanation of symbols]

 1 Side Frame 2 Top Cover 3 Seat 4 Front Bracket 5 Front Insulator 7b Inner Tube (Center Projection) 7c Anti-vibration Rubber 8 Mounting Bolt (Stopper) 9 Mount Rubber Plate 10 Hinge 11 Rear Insulator 11b Anti-vibration Rubber 15 Rear Support bracket 20 Shaft 21 Second rear insulator 22 Guide plate

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kinya Miwa 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Rika Furukawa 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd.

Claims (4)

[Claims] 1. An industrial vehicle in which a top cover protruding upward is attached to an upper portion of a vehicle body, and a seat is attached to an upper surface of the top cover. The top cover is attached to the vehicle body via a cushioning body. An anti-vibration support structure for a seat in an industrial vehicle, which is characterized by being attached. 2. In an industrial vehicle in which a rear portion of a top cover is attached to a vehicle body via a hinge, a rear supporting bracket having a shaft oriented vertically is provided upright from the vehicle body,
The anti-vibration support structure for a seat in an industrial vehicle according to claim 1, wherein a mounting portion of the hinge on the vehicle body side is connected to an upper portion of the bracket via anti-vibration rubber. 3. An industrial vehicle in which a rear portion of a top cover is attached to a vehicle body via a hinge, and a front bracket having a horizontal portion fixed to an inner surface of a front portion of the top cover and having a lower surface horizontally arranged. , A central protruding portion that is attached to the horizontal portion of the bracket via a vibration-proof rubber and protrudes downward from the horizontal portion, and has a predetermined interval in the vehicle body left-right direction from the central protruding portion. A stopper attached to the horizontal portion and protruding downward, and fixed to the upper surface of the body of the vehicle body, when the top cover is closed, the upper surface abuts the central protruding portion and the side surface is lateral to the stopper. The anti-vibration support structure for a seat in an industrial vehicle according to claim 1, further comprising: a mount rubber plate having a predetermined clearance and a height higher than a protruding amount of the stopper from a horizontal portion. 4. A body main body side mounting portion of a hinge is connected to an upper portion of a rear support bracket via a vibration-proof rubber, and members of the vehicle body main body side mounting portion that are involved in the connection are extended downward. The lower part of the extension part can be swung via the second anti-vibration rubber to the lower part of the rear support bracket or the second rear support bracket fixed to the vehicle body separately from the rear support bracket. The vibration-proof support structure for a seat in an industrial vehicle according to claim 2, wherein the vibration-proof support structure is connected.