JP2903922B2 - Floor float structure for industrial vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a top cover in an industrial vehicle such as a forklift truck,
In particular, the present invention relates to a floor float structure for reducing transmission of vibration to a driver.

[0002]

2. Description of the Related Art Conventionally, as a float structure of a top cover for preventing vibration of an engine or the like or vibration from a road surface during traveling from being transmitted to a driver via a vehicle body, there is, for example, Japanese Utility Model Laid-Open No. 61-57474. Bulletin No. 61-243
No. 77 is known.

[0003] In these, a cab body integrally formed with a floor, an overhead guard, a top panel, and the like is attached to upper portions of left and right side frames constituting a body body via a cushioning material, so that the cab body is directly connected to the body body. The vibration transmitted to the cab body is absorbed by the cushioning material to reduce the vibration input to the cab, thereby suppressing the transmission of vibration to the seat provided in the cab and the driver sitting on the seat.

[0004] In a conventional industrial vehicle, the seat is rigidly attached to the floor or the upper part of the side frame in the cab, and the outer surface is attached to the upper surface of a box-shaped top panel.

[0005]

However, in the above-mentioned float structure, industrial vehicles generally have a high vehicle height.
In many cases, the driver grips the pillar portion of the cab and gets on and off the vehicle body. When the driver grips the pillar portion and moves up and down, the entire cab bends and there is no sense of stability. In addition, there is a problem that the structure of the cab is complicated because the whole cab is to be damped, and the number of parts for the damping is increased and the cost is increased.

There is also a means for suppressing vibration to the driver by providing a vibration damping mechanism between the top panel mounted on the vehicle body and the seat, but the seat mounting position is raised by the vibration damping mechanism. In addition, there is a problem that stability is deteriorated and head clearance cannot be secured. In view of the above problems, the inventor of the present application has made Japanese Patent Application No. 4-1.
No. 47616 discloses that only the top panel is elastically supported on the vehicle body without damping the entire cab. As a result, the entire cab has a desired rigidity, and the vibration transmitted to the driver via the seat is suppressed without changing the height of the seat mounting portion.

However, in the method disclosed above, since the floor panel is directly attached to the vehicle body, the vibration input to the vehicle body is input to the driver's foot via the floor panel. There was a problem. The cushioning material such as rubber for elastically supporting the top panel, particularly the cushioning material provided at the hinge portion at the rear portion of the top panel, is such that when the top panel is opened, the weight of the top panel is entirely reduced by the cushioning material at the hinge portion. Therefore, there are problems that the durability is deteriorated in proportion to the weight of the top panel and that a large cushioning material needs to be provided.

The present invention has been made in view of the above-mentioned problems, and reduces the load on a cushioning material for elastically supporting the top panel itself and reduces vibration input to the driver's foot. The purpose is to control.

[0009]

In order to achieve the above object, a floor float structure of an industrial vehicle according to the present invention comprises a top panel projecting upward and supporting a seat, and a floor panel located in front of the top panel. In an industrial vehicle in which a top cover consisting of a top cover is attached to an upper portion of the vehicle body and a rear portion of the top panel is attached to the vehicle body via a hinge, the front surface of the top panel is opened and the floor panel is The front and back of the floor panel are divided into two parts at the middle of the front and rear direction, and the rear panel has a blocking panel projecting upward so as to be able to close the front surface of the top panel, and the floor panel and the top panel are It is characterized in that each is attached to the vehicle body via a buffer material.

At this time, it is preferable that the lower end portions on both left and right sides of the front portion of the top panel can be placed on the floor panel on the rear side.

[0011]

Normally, in a top panel mounted on an industrial vehicle, a rear mounting portion on the vehicle body constitutes a hinge, and the top panel can be opened and closed in a vertical direction about the position. Because of this, if the top panel is heavy,
When the top panel is opened, the load on the hinge portion increases, and when the rear portion of the top panel, such as the hinge mounting portion, is elastically supported by the vehicle body, the durability of the cushioning material installed there is reduced by the weight of the top panel. It gets worse and you have to use a big buffer.

According to the present invention, in order to cope with this, the front panel is provided on the floor panel side to make the top panel lighter than before, and to provide a cushioning material for elastically supporting the rear portion of the top panel. The burden is reduced, and a smaller cushioning material than before can be used. In addition, by elastically supporting the top panel, the vibration transmitted from the road surface or the drive unit to the vehicle body is reduced from being transmitted to the top panel and the seat thereon, and the floor panel is elastically supported. Thus, the vibration transmitted from the vehicle body to the floor panel is also reduced, and the vibration input to the driver's foot is reduced.

[0013] In addition, by using a structure in which the floor panel is divided into front and rear parts, when a drive unit or the like in the vehicle body is maintained, the work can be performed by opening the top panel and removing only the rear floor panel. It will be feasible and will not deteriorate maintenance. When performing heavy maintenance, also remove the front floor panel.

Further, since the lower ends of the left and right sides of the top panel are simply placed on the rear floor panel, the load on the top panel fixes the rear sides of the rear floor panel. Attachment can be performed only by fixing at least one location on the front side, and attachment and removal of the rear floor panel can be easily performed.

[0015]

An embodiment of the present invention will be described with reference to the drawings.
First, the configuration will be described. As shown in FIG. 3, a top cover is attached to upper portions of left and right side frames 1 which extend in the front-rear direction of the vehicle body and form a part of the vehicle body. The top cover includes a box-shaped top panel 2 protruding upward and a floor panel 3 installed on the front side of the box-shaped top panel 2, and a seat 4 is mounted on the top panel 2.

The floor panel 3 is divided into two parts at the middle of the vehicle body in the front-rear direction, as shown in FIG.
It is composed of a front floor panel 5 and a rear floor panel 6. The front left edge of the front floor panel 5 has a mounting hole 5 formed therein, as shown in FIG.
a, a cylindrical cushioning member 7 and a collar 8 are coaxially attached to the bracket 1a, and a bracket 1 fixed to a cross member 10 which is a vehicle body side member by a bolt 9 penetrating the collar 8.
1 and serves as a fixed point on the front side.

A flat cushioning member 12 is also fixed to the lower surface of the front edge central portion of the front floor panel 5, and the lower surface of the cushioning member 12 is, as shown in FIG.
It is arranged in a state of being close to the upper surface of the bracket 13 fixed at the center of the vehicle width direction 0. As shown in FIGS. 6 and 7, positioning brackets 14 are respectively attached to the lower surfaces of the rear left and right sides of the front floor panel 5. The positioning bracket 14 has a contact portion 14a that can bend in the vehicle width direction. From the upper side, the contact portions 14a of the left and right positioning brackets 14 are brought into contact with the inside of the left and right side frames 1, respectively. By pushing the front floor panel 5, the front floor panel 5 is set at a predetermined position and is regulated at that position.

In FIG. 6, A is a line showing the inside of the side frame 1. Further, a flat cushioning material 15 is provided on the lower surface on the rear left and right sides of the front floor panel 5, respectively.
Are fixed, and the lower surface of each cushioning material 15 is in contact with the upper portion of the side frame 1. The front floor panel 5 is supported at three points by the pair of cushioning members 15 and the fixed points on the front side, and the front floor panel 5 is restrained from moving in the front-rear direction and the left-right direction by the bending of the left and right positioning brackets 14. , And is elastically supported by the vehicle body.

As shown in FIG. 6, a pair of flat front stoppers 16 are fixed to the lower surface of the rear end of the front floor panel 5 so as to project rearward at symmetrical positions. A dovetail groove 17 is formed by the facing portion of the front stopper 16. A wedge-shaped dovetail 18 that can be engaged with the dovetail groove 17 is fixed to the lower surface of the front end portion of the rear floor panel 6 so as to protrude forward.
The dovetail groove 17 of the front floor panel 5 is fitted into the dovetail 18 from above, so that the front and rear sides of the rear floor panel 6 are regulated so that the front and rear directions of the rear floor panel 6 are regulated. It is fixed to the vehicle body via a panel 5.

A closing panel 19 extends upward from the center of the rear end of the rear floor panel 6, and the right and left sides of the rear end of the rear floor panel 6 are tongue-shaped toward the rear. The extension part 6a is extended. A flat buffer member 20 is fixed to the left and right lower surfaces of the rear floor panel 6, and a flat buffer member 21 is also provided on the lower surface of the left and right extending portions 6a, as shown in FIG. The lower surfaces of the cushioning members 20 and 21 abut on the upper surface of the side frame 1, whereby the rear floor panel 6 is elastically supported by the vehicle body.

A sealing member 22 is attached to the periphery of the closing panel 19. Also, in FIG.
Is a rubber mat laid on the floor panel 3. As shown in FIG. 2, the top panel 2 has a box shape with an opening at the bottom, and also has an opening at the front. Front brackets 24 are provided on left and right portions 2a of the opening, respectively.

The front bracket 2a is shown in FIGS.
As shown in FIG. 0, the upper portion is fixed to the upper portion of the inner surface of the front panel left and right portions, and the lower portion forms a horizontal rectangular plate-like horizontal portion 24a, and the tip of the horizontal portion 24a is
The top panel 2 is fixed in contact with the inner surface of the distal end portion. The horizontal portion 24a has a circular through-hole with a vertical axis at the center thereof, and a bolt hole at each of the four corners.

A front insulator 25 is attached to the horizontal portion 24a from below. The insulator 25 is configured by projecting an anti-vibration member upward at the center of a square plate, inserting the anti-vibration member into the through hole of the horizontal portion 24a, and attaching the four corners from below to the mounting bolts 26, respectively. It is attached by screwing. The vibration isolating member of the insulator 25 has a vibration isolating rubber 25b interposed between an outer cylinder 25a and an inner cylinder 25c which are arranged concentrically with the axis up and down, and the outer cylinder 25a is fixed to a plate. The lower end of the inner cylinder 25c slightly protrudes downward to form a central protruding portion.

The heads of the four mounting bolts 26 projecting downward from the plate constitute a stopper. Then, when the top panel 2 is closed, as shown in FIG. 10, the insulator 25 is placed on the left and right extending portions 6a of the corresponding rear floor panel 6 (the position B in FIG. 8).
And the load causes the rear portion of the rear floor panel 6 to be restrained from rising.

At this time, as shown in FIGS. 8 and 9, the front portion 2a of the top panel 2 is designed to be placed between the cushioning members 20 and 21 fixed to the lower surface of the rear floor panel 6, so that the contact is made. The jump load of the rear floor panel 6 due to the above arrangement in the section is reduced. When the top panel 2 is closed, the periphery of the opening on the front surface of the top panel 2 is attached to the outer periphery of the closing panel 19 integrated with the rear floor panel 6 by a sealing member 22.
And the seal member 22 can prevent dust and the like from entering the top panel 2.

A mounting rubber plate 27 made of a vibration-proof rubber 25b is provided at a contact position on the upper surface of the extension 6a.
Is provided. The height h1 of the mounting rubber plate 27 is higher than the height h2 of the head of the mounting bolt, and when the top panel 2 is closed as shown in FIG. It is arranged so as to have a predetermined clearance δ in the horizontal direction between the section and the mount rubber plate 27.

The rear part 2b of the top panel 2 is attached by mounting one of the brackets 29b sandwiching a pin 29a of a hinge 29 which is an opening / closing bracket on the left and right sides of the rear part, as shown in FIGS. 30 by top panel 2
Is screwed to the rear part 2b. The hinge 29 extends rearward, and the other fitting 29c sandwiching the pin 29a is provided.
A rear mounting bracket 31 for fixing the rear insulator 30 is fixed to the rear mounting bracket 31.

At the lower part of the mounting bracket 31, a through-hole through which the mounting bolt 32 can pass is opened, and the rear insulator 30 is inserted into the mounting bracket 31 from below.
Is abutted. The rear insulator 30 is configured by connecting an inner cylinder 30c and an outer cylinder 30a, which are doubly arranged at a predetermined interval, via a vibration-isolating rubber 30b. Up and down bolt 3
2 is inserted from below, and further through a through hole of the mounting bracket 31 and screwed into a nut 33 provided on the bracket 31, thereby mounting the mounting bracket 31
The rear insulator 30 is attached to the rear end.

The outer cylinder 30 of the rear insulator 30
A flange 30d is provided on the outer periphery of a, and the flange 30d is fixed to an upper portion of a rear support bracket 33 standing upright on an upper portion of the side frame 1 which is a part of the vehicle body. The top panel 2 attached as described above can be pivoted up and down about the pin 29a of the hinge 29 as a rotation axis to be openable and closable, and has a well-known pressing mechanism (not shown) for pressing the front portion downward when closed. doing. Then, the seat 4 is attached to the upper part of the top panel 2.

By mounting the top panel 2 as described above, the rear mounting portion of the top panel 2 is mounted on the side frame 1 via the vibration isolating rubber 30b of the rear insulator 30. Further, the state in which the top panel 2 is closed, that is, the contact state between the front portion of the top panel 2 and the extending portion 6a of the rear floor panel 6 in a normal state,
Only the inner cylinder 25c of the front insulator 25 fixed to the front bracket 2a is the rear floor panel 6 extension 6
The structure is in contact with a mount rubber plate 27 fixed to a. At this time, the mount rubber plate 27
Is higher than the height of the head of the mounting bolt, the head of the mounting bolt does not come into contact with the upper part of the extension 6a.

Thus, even if vibration transmitted from the engine or the like as a drive unit or the road surface to the vehicle body is to be input to the top panel 2 via the side frame 11, the insulators 25, 30
Absorbs the vibration, so that the vibration transmitted to the seat 4 via the top panel 2 is reduced. That is, in the rear mounting portion, the vibration transmitted to the side frame 1 is transmitted to the outer cylinder 30a of the rear insulator 30 via the rear support bracket 33, but the vibration isolator fixed to the outer cylinder 30a. The rubber 30b absorbs the vibration and the vibration transmitted to the inner cylinder 30c fixed inside the vibration isolating rubber 30b is reduced, and thus the rear part of the top panel 2 attached via the rear insulator 30 Vibration input to the top panel 2 and the seat 4 from the mounting portion is suppressed to be small.

In the front portion of the top panel 2, at a portion in contact with the side frame 1 via the extended portion 6 a of the rear floor panel 6, the vibration transmitted to the side frame 1 is transmitted via the mount rubber plate 27. Is transmitted to the inner cylinder 25c of the front insulator 25, but the vibration-proof rubber 25b fixed to the outside of the inner cylinder 25c absorbs the vibration and is fixed to the outside of the vibration-proof rubber 25b. The vibration transmitted to the cylinder 25a is reduced, and the vibration input from the front portion of the top panel 2 to the top panel 2 and the seat 4 via the front insulator 25 is suppressed.

The mounting structure of the top panel 2 is arranged such that the front insulator 25 is accommodated in the space inside the top panel 2 at the front part, and the height of the hinge 29 mounting part at the rear part. The height of the upper portion of the top panel 2 is the same as that of the prior art by setting the height of the rear support bracket 33 so that the height of the rear support bracket 33 does not become higher than before. The mounting height of the seat 4 can be set to the same height as the conventional one.

In the mounting structure of the top panel 2 as described above, a lateral force is applied to the vehicle body due to a sudden turn of the vehicle or the like, and the vibration-proof rubber 25b of the insulator provided at the front of the top panel 2 is moved in the horizontal direction. Even if the top panel 2 is bent and the front part is displaced more than the set value in the lateral direction, if the front part is displaced more than the set value, the side of the head of the mounting bolt 26 fixed to the top panel 2 side is mounted on the mount rubber plate 2.
7 is restricted so as to be in contact with the side surface of the actuator 7 so as not to be displaced laterally beyond a set value.

At this time, since the weight on the front side of the top panel 2 is light, the vibration isolating rubber 30
b reduces the load borne by the conventional vibration-proof rubber 3
0b has improved durability. The amount of displacement is determined by the simple means of appropriately selecting the clearance between the top panel 2 and the head of the mounting bolt 26, the shape of the contact portion of the top panel 2 with the mounting bolt 26, and the like. The amount of displacement can be set.

In the above embodiment, the mounting rubber plate 27 can be brought into contact with the heads of the mounting bolts 26 located on the left and right to restrict the displacement of the front end of the top panel 2 in the left and right direction. The plate 27 may be shaped like a cross, and a predetermined clearance may be interposed between the mounting bolts 26 facing the front and rear so as to restrict the displacement in the front and rear direction.

Further, since the top panel 2 of this embodiment has a separate front portion, the weight of the top panel 2 is reduced as compared with the conventional case, and the load to be borne by the insulator 30 at the rear position is reduced. . As a result, the durability of the rubber of the insulator 30 is improved, and it is also possible to employ a smaller insulator than before.

Further, even if vibration transmitted from the engine or the like as a drive unit or the road surface to the vehicle body is input from the side frame 1 or the cross member 10 to the front and rear floor panels 3, the panel 3 is supported. The cushioning members 7, 15, 20, 21 absorb the vibration, and the vibration input to the foot when the driver's foot is placed on the floor panel 3 is reduced.

When the engine or the like is to be maintained, the top panel 2 is first opened so that the rear floor panel 6 is opened.
The rear floor panel 6 can be easily removed since the rear portion is not restrained. Also, rear floor panel 6
At the time of re-attachment and assembling,
The front dovetail 18 is fitted on the dovetail groove 17 of the front floor panel 5, is arranged on the side frame 1, and is easily mounted by closing the top panel 2.

When assembling the front floor panel 5, the front portions are bolted through the cushioning members 7 as described above, and then the contact portions of the left and right positioning brackets 14 are attached to the side frames. It can be attached to the target position simply by pushing it in from the top so that it abuts the inside of 1. Also, when the vehicle is removed for heavy maintenance of the vehicle, the vehicle can be easily removed simply by removing the front bolt 9.

As described above, the floor panel 3 of this embodiment is
Regardless of whether the bolting position on the vehicle body side is only one, it is easily installed at a predetermined position to restrict left-right and front-rear movements, and can be easily attached and detached.

[0042]

As described above, in the floor float structure of the industrial vehicle according to the present invention, not only the top panel but also the floor panel portion is damped, and the durability of the cushioning material elastically supporting the top panel is improved. Thus, there is an effect that the attachment and detachment of the floor panel are facilitated while improving the height.

[Brief description of the drawings]

FIG. 1 is an exploded view showing a floor panel according to an embodiment of the present invention.

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

FIG. 3 is a side view showing a top panel and a floor panel according to an embodiment of the present invention.

FIG. 4 is a side view showing a fixing point on the front side of the front floor panel of the embodiment according to the present invention.

FIG. 5 is a side view showing a front center portion of a front floor panel according to the embodiment of the present invention.

FIG. 6 is a bottom view showing a connecting portion between the front floor panel and the rear floor panel according to the embodiment of the present invention.

FIG. 7 is a side view showing a contact state between a positioning bracket and a side frame according to the embodiment of the present invention.

FIG. 8 is a plan view showing a contact position of a top panel with a rear floor panel according to the embodiment of the present invention.

FIG. 9 is a side view showing a contact position of the top panel with the rear floor panel according to the embodiment of the present invention.

FIG. 10 is a side view showing the front float structure of the top panel of the embodiment according to the present invention.

FIG. 11 is a bottom view showing the front float structure of the top panel of the embodiment according to the present invention.

FIG. 12 is a perspective view showing a rear float structure of a top panel according to an embodiment of the present invention.

FIG. 13 is a side view showing the front float structure of the top panel according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side frame 2 Top panel 3 Floor panel 4 Seat 5 Front floor panel 6 Rear floor panel 19 Closure panel

Claims (2)

(57) [Claims] 1. A top cover comprising a top panel projecting upward to support a seat and a floor panel located in front of the top panel is attached to an upper portion of a vehicle body, and a rear portion of the top panel is connected to the vehicle body via a hinge. In the industrial vehicle mounted on the front panel, the front surface of the top panel is opened, and the floor panel is divided into two parts at the middle of the vehicle body longitudinal direction. A floor float structure in an industrial vehicle, characterized in that a closing panel projects upward so as to be able to close the floor, and the floor panel and the top panel are respectively attached to the vehicle body via a cushioning material. 2. The left and right lower ends of the front part of the top panel are
The floor float structure for an industrial vehicle according to claim 1, wherein the floor float structure can be mounted on a rear floor panel.