JP3552467B2 - Forklift body structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a body structure of a forklift.
[0002]
[Prior art]
In a conventional forklift, a hood generally covers an engine, a battery, and the like, and an operation seat is fixed to an upper surface of the hood. At the time of maintenance of the engine and the like, the hood is rotated upward and rearward with the rear end as an axis and retracted to perform maintenance.
[0003]
Further, a head guard is provided above the driving seat for the purpose of protecting the occupant sitting on the driving seat from falling objects and the like. The head guard is supported by a total of four pillars standing upright from the vehicle body. Here, a pair of right and left rear pillars on the rear side are erected substantially vertically or slightly upward from the vicinity of the rear end of the hood so as not to interfere with the rotating hood. A counterweight is located behind the rear pillar.
[0004]
[Problems to be solved by the invention]
In order to position the head guard vertically above the occupant seated in the driver's seat, it is necessary to arrange the lower end of the rear pillar that is substantially vertical or inclined forward to some extent behind the driver's seat. Since the counterweight is disposed behind the vehicle, the length in the longitudinal direction of the vehicle body is inevitably increased, which has been a problem in reducing the size of the vehicle.
[0005]
Further, as another problem, it is necessary to lay out such that the steering or the like does not exist on the rotation locus of the hood about the rear end portion, which is a bad effect in shortening the length in the vehicle longitudinal direction. In order to avoid interference with the steering or the like, for example, it is conceivable to cut out the front part of the hood or to provide a tilt mechanism in the steering, but the structure becomes complicated and the manufacturing cost increases accordingly.
[0006]
In particular, when an LPG cylinder is installed above the counterweight as in an LPG car, it is necessary to avoid interference between the driving seat mounted on the hood and the LPG cylinder, and further shorten the overall length of the vehicle body And the structure becomes complicated.
[0007]
[Means for Solving the Problems]
In view of the above, a first aspect of the present invention provides an operation seat disposed above a hood covering an engine or a battery, a head guard disposed above the operation seat, and a pair of left and right rear pillars supporting the head guard. In the body structure of a forklift in which a fork is disposed near the rear end , a fork is disposed on the front side of the vehicle body, and a counterweight is disposed on the rear side of the rear pillar, the rear pillar has an upper part to which the head guard is fixed. The hood is characterized by being inclined with respect to a vertical plane so as to be located on the rear side of the vehicle body with respect to a lower portion erected near the rear end of the hood.
[0008]
The invention according to claim 1 is characterized in that a seat frame supporting the driving seat is attached to the rear pillar so as to move up and down along the rear pillar .
[0009]
The invention according to claim 2 is characterized in that the hood is fixed to the seat frame and moves up and down along the rear pillar together with the seat frame.
[0010]
The invention according to claim 3 is characterized in that a shock absorber is interposed between the seat frame and the vehicle body.
[0011]
【The invention's effect】
According to the first aspect of the present invention, since the upper portion of the rear pillar is located relatively rearward, the head guard supported by the rear pillar is extended relatively rearward, and the lower side of the rear pillar is relatively located. Since it is located on the front side, the counterweight located on the rear side of the rear pillar can be relatively located on the front side. As a result, it is possible to reduce the length of the vehicle body in the front-rear direction by disposing the counterweight relatively on the front side while reliably extending the head guard to the rear side of the driving seat.
[0012]
In addition, since the rear area is relatively wider on the lower side of the rear pillar than on the rear pillar, for example, the fuel neck of the engine vehicle is disposed on the rear side of the rear pillar, that is, outside the cab surrounded by the head guard and the pillar. Becomes possible. Therefore, for example, as compared with the conventional structure in which the fuel neck is disposed immediately below the operation seat in the cab, the fuel neck is relatively far from the operation seat, so that safety and odor are improved.
[0013]
In addition , according to the first aspect of the present invention, the driving seat moves up and down along the rear pillar, that is, moves up and down in the driving room surrounded by the head guard and the pillar, and a member located outside the driving room, for example, a counterweight. There is no possibility of interference with the LPG cylinder and the like arranged on the upper surface. Therefore, it is not necessary to extend the length in the vehicle longitudinal direction in order to avoid interference with the LPG cylinder, and it is not necessary to add a retractable swing mechanism or the like to the LPG cylinder. Can be shortened.
[0014]
Also, since the driving seat is attached to the rear pillar via the seat frame, the load applied from the driving seat to the hood is reduced as compared with the conventional case where the driving seat is directly fixed on the hood, The hood can be simplified and downsized.
[0015]
According to the second aspect of the invention, for example, when performing maintenance of the engine or the like, the operation seat and the hood may be moved up and down along the rear pillar together with the seat frame. At this time, since the driver's seat and the hood move up and down in the cab along the rear pillar, there is no possibility that the driver's seat or the hood will interfere with, for example, a steering located in front of the hood. In other words, the trajectory in the front-rear direction of the vehicle body is smaller than that of the conventional hood that is of a rotary type, so the degree of freedom in layout is increased, and the vehicle itself is compact with a simple structure. can do.
[0016]
According to the third aspect of the invention, since the shock absorber is interposed between the seat frame and the vehicle body, engine vibration and road surface vibration transmitted to the driver's seat can be effectively attenuated, and the riding comfort is improved. .
[0017]
Further, since the shock absorber is provided, the seat frame can be safely and smoothly moved up and down along the rear pillar.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0019]
FIG. 1 is a side view showing an embodiment of a forklift to which a vehicle body structure according to the present invention is applied. A fork 12 and a mast 14 are arranged on a front side of a vehicle body, and a counterweight 16 is arranged on a rear side of the vehicle body. Side frames 18 extend on both left and right sides of the frame. An engine, a battery, and the like (not shown) are housed between the two side frames 18, and an engine hood 20 is disposed over the both side frames 18 so as to cover the upper parts of the engines and the like.
[0020]
A driving seat 22 is disposed above the engine hood 20. A head guard 24 is disposed above the driving seat 22 to protect an occupant sitting on the driving seat 22 from falling objects such as loads. I have. The head guard 24 has a structure in which frame members are arranged in a lattice shape, and is supported on the vehicle body side by four front pillars 26 and rear pillars 28 standing upright from the vehicle body at four front, rear, left, and right corners. .
[0021]
Here, in the present embodiment, a pair of left and right rear pillars 28 erected near the rear end of the engine hood 20 are positioned with respect to a vertical plane so that the upper part thereof is located on the vehicle rear side of the lower part. It is inclined by a predetermined angle θ.
[0022]
Therefore, in the region below the driving seat 22, the rear pillar 28 is relatively protruded forward, and the counterweight 16 disposed behind the rear pillar 28 can be disposed relatively forward. On the other hand, in the region above the rear pillar 28, the rear pillar 28 is located relatively rearward, and the head guard 24 fixed to the upper end of the rear pillar 28 is extended relatively rearward. As a result, it is possible to arrange the counterweight 16 relatively on the front side while reliably extending the head guard 24 to the rear side of the driving seat 22, and it is possible to effectively reduce the length of the vehicle body in the front-rear direction.
[0023]
The cab K, which is surrounded by the head guard 24 and the pillars 26 and 28, extends above the counterweight 16 which is a vacant space. K is secured.
[0024]
Further, the rear pillar 28 is inclined at substantially the same angle as the backrest portion 22a of the driving seat 22, and is located slightly behind the backrest portion 22a in a side view, that is, behind the occupant seated on the driving seat 22, It does not disturb the crew.
[0025]
In addition, the front pillar 26 on the front side is also inclined so that the upper side is located on the rear side similarly to the rear pillar 28, that is, the entire cab K is slightly inclined to the rear side, and the appearance quality is improved. Is also excellent.
[0026]
By the way, in the engine-type forklift 10, a fuel tank (not shown) is provided inside the side frame 18, and a fuel neck 30 for replenishing the fuel tank with fuel is provided on the upper surface of the side frame 18. The fuel neck 30 is located on the rear side of the rear pillar 28 and is exposed to the outside via a notch 32 formed on the front side of the counterweight 16.
[0027]
Here, the fuel neck 30A in the conventional structure is provided at a position directly below the driving seat 22 in the driving cab K as shown by a virtual line in FIG. 1, and the engine hood 20 is appropriately cut out to be exposed to the outside. Was. In this case, the driving seat 22 is located immediately above the fuel neck 30A, and there is a problem in terms of safety and odor. On the other hand, in the present embodiment, the lower side of the rear pillar 28 projects relatively forward, and the rear side of the rear pillar 28 is relatively wide, so that the fuel neck 30 is positioned rearward of the rear pillar 28, that is, the operator's cab K Outside. As described above, since the fuel neck 30 can be kept away from the driving seat 22, safety and odor are improved.
[0028]
Further, as a characteristic structure of the present embodiment, a seat frame 34 that supports the driving seat 22 is attached so as to be able to move up and down along the rear pillar 28. That is, the seat frame 34 is fixed to the lower surface side of the operation seat 22 via the four rods 36 and is fixed to the upper surface side of the engine hood 20 via the rods 36. Therefore, the driving seat 22 and the engine hood 20 move up and down along the rear pillar 28 together with the seat frame 34.
[0029]
More specifically, referring to FIGS. 2 and 3, the seat frame 34 has a support portion 34 a that is bent in a substantially U-shape according to the lower shape of the driving seat 22, and extends left and right from both ends of the support portion 34 a. An arm portion 34b is provided, and a total of four through holes 34c through which the rod 36 is inserted and fixed are formed in the support portion 34a, and a rectangular stopper portion 34d is formed at the outer end of the arm portion 34b. .
[0030]
An inwardly protruding engagement pin portion 34e is formed at an inner end of the arm portion 34b, and a shock absorber 38 is attached to the engagement pin portion 34e. The shock absorber 38 is interposed between the seat frame 34 and the vehicle body. The shock absorber 38 attenuates engine vibrations and road surface vibrations transmitted to the driver's seat 22 to improve ride comfort. Is safely and smoothly performed.
[0031]
On the other hand, an opening 28a extending in the longitudinal direction is formed on the inner wall surface of the rear pillar 28, and a guide rail 40 is joined and fixed to the inner surface of the opening 28a. The stopper portion 34d of the seat frame 34 is disposed inside the guide rail 40 via the opening 40a of the guide rail 40, and moves up and down in the guide rail 40. A lid member 41 (see FIG. 3) for closing the lower end of the opening 40a is joined to the guide rail 40, so that the seat frame 34 does not move further downward.
[0032]
Further, the rear pillar 28 includes a first lock member 42 for holding the seat frame 34 at the most lowered steady position and a second lock member 44 for holding the seat frame 34 at the most retracted position. It is mounted swingably.
[0033]
When the seat frame 34 is locked in the normal position as shown in the lower side of FIG. 3, the first locking member 42 causes the lower arm 42b of the first locking member 42 to move inside the guide rail 40 via the notch 40b by the urging force of the spring 42a. And faces the upper surface of the stopper portion 34d. To release the lock, the upper arm 42c of the first lock member 42 may be pressed to retract the lower arm 42b from within the guide rail 40. When the seat frame 34 descends, the stopper portion 34d pushes the inclined lower arm 42b and enters the steady position shown in FIG.
[0034]
On the other hand, when the seat frame 34 is locked at the retracted position as shown in the upper part of FIG. 3, the second locking member 44 causes the locking claw 44b to face the inside of the guide rail 40 via the notch 40c by the spring 44a. And is engaged with the lower surface of the stopper portion 34d. To release the lock, the upper arm 44c of the second lock member 44 may be pressed to retract the locking claw 44b from within the guide rail 40. When the seat frame 34 rises, the stopper portion 34d pushes the lower surface of the locking claw 44b and enters the retracted position.
[0035]
For example, when performing maintenance of the engine or the like, the lock of the first lock member 42 is released, and the driving seat 22 and the engine hood 20 are slid upward along the rear pillar 28 together with the seat frame 34, and the second lock member 44 To lock to the retracted position. As a result, the upper part of the engine and the like is opened, and maintenance can be easily performed.
[0036]
As described above, the driving seat 22 and the engine hood 20 slide up and down along the rear pillar 28 together with the seat frame 34, that is, move up and down in the driving cab K, so that the driving seat is fixed as in the related art. In particular, the moving range in the front-rear direction of the vehicle is smaller than that of a rotating hood. As a result, the degree of freedom in the layout of each member increases, and for example, there is no possibility that the engine hood 20 interferes with the steering 46 or the like located at the front.
[0037]
In addition, even in an LPG vehicle in which an LPG cylinder 48 as shown by a virtual line in FIG. 1 is mounted on the upper surface of the counterweight 16, there is a possibility that the elevating body such as the engine hood 20 and the driving seat 22 may interfere with the LPG cylinder 48. There is no need to change the layout.
[0038]
Further, the load on the driving seat 22 is applied to the vehicle body via the shock absorber 38 and the rear pillar 28, and the load on the engine hood 20 is reduced. Therefore, the engine hood 20 can be simplified and downsized. .
[0039]
In the above embodiment, the engine hood 20 is fixed to the seat frame 34. However, for example, only the driving seat 22 may be fixed to the seat frame 34, and the hood may be configured to rotate around the rear end. . In this case, with the operation seat 22 retracted upward together with the seat frame 34, the hood is rotated rearward and upward to open the upper portion of the engine and the like.
[0040]
Also, here, the engine type forklift 10 has been described, but the present invention can be similarly applied to a battery type forklift.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a forklift to which a vehicle body structure according to the present invention is applied.
FIG. 2 is an exploded perspective view showing the seat frame mounting structure of FIG. 1;
FIG. 3 is a side view corresponding to the vicinity of the rear pillar in FIG. 1;
[Explanation of symbols]
16 Counterweight 18 Side frame 20 Engine hood 22 Driving seat 24 Head guard 28 Rear pillar 30 Fuel neck 34 Seat frame K Driver's cab

Claims (3)

An operation seat is disposed above a hood that covers the engine or the battery, a head guard is disposed above the operation seat, and a pair of left and right rear pillars that support the head guard are erected near the rear end of the hood. In a forklift body structure in which a fork is arranged on the front side of the vehicle body and a counterweight is arranged on the rear side of the rear pillar,
The rear pillar is inclined with respect to a vertical plane such that an upper portion to which the head guard is fixed is located closer to the rear of the vehicle than a lower portion erected near the rear end of the hood ,
A vehicle body structure for a forklift, wherein a seat frame supporting the driving seat is mounted on the rear pillar so as to move up and down along the rear pillar . The body structure of a forklift according to claim 1 , wherein the hood is fixed to the seat frame and moves up and down along a rear pillar together with the seat frame. The body structure of a forklift according to claim 1 or 2 , wherein a shock absorber is interposed between the seat frame and the body.

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