JPH0524555A - Frame structure of battery operated three-wheel forklift - Google Patents

Abstract

PURPOSE:To provide a frame structure of a battery-operated three-wheel forklift which is low in cost, of high strength and strong against thermal distortion and high in degree of freedom in the vertical directional position of a boss mounting plate. CONSTITUTION:This frame structure is provided with a lower plate 21 having a circular arc part 21a spaced by a specified distance from a locus S of the extreme outline of a steering tire; a back plate 22 extending in the direction substantially vertical to the lower plate 21; a pair of steering axle plates 23, 24 extending in the direction substantially vertical to the lower plate 21 while being a part from each other and brought into contact with both the plate 21, 22, respectively; and a boss mounting plate 25 which has a boss 25a supporting the steering tire and is provided so as to be in contact with the back plate 22 while sandwiched by the plates 23, 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure for a battery type three-wheel forklift.

[0002]

2. Description of the Related Art As a conventional frame structure of a battery-operated three-wheel forklift, for example, the structures shown in FIGS.
299). In FIG. 8, reference numeral 1 denotes a lower plate, and the lower plate 1 slightly projects to the vehicle rear side of the back plate 2. A pair of side frames 3 and 4 is provided on both sides of the lower plate 1 and the back plate 2, and a boss mounting plate 5 is placed on the pair of side frames 3 and 4. The steering tire (not shown) is supported by a boss 5 a formed on the boss mounting plate 5.

In FIGS. 9 and 10, a box structure is provided on both sides in the vehicle width direction of a boss 11a for supporting a steering tire (not shown).
A boss mounting plate 11 having 12 and 13 and having a boss 11a is bridged in the vehicle width direction. A pair of plates 1 at both ends of the boss mounting plate 11 in the vehicle width direction
4 and 15 are provided, and a pair of pillars 16 and 17 are joined to the plates 14 and 15, respectively.

[0004]

However, these conventional battery-type three-wheel forklift frame structures have the following problems. That is, in the battery-type three-wheel forklift frame structure of FIG. 8, the boss mounting plate 5 is long in the vehicle width direction and both ends thereof are mounted on the side frames 3 and 4, so that the frame structure is weak in strength. Moreover, there is a problem that the vertical position of the boss mounting plate 5 is determined by the height of the side frame 3 and the degree of freedom of the vertical position of the boss mounting plate 5 is reduced. Furthermore, the boss mounting plate 5
When welding the back plate 2 to the back plate 2, there is no plate or the like for pressing the boss mounting plate 5, so bending due to thermal strain cannot be prevented, and the spaces on both sides of the steering tire in the vehicle width direction are not effectively used. There was also such a problem.

On the other hand, in the frame structure of the battery type three-wheel forklift truck shown in FIGS. 9 and 10, since the complicated box structures 12, 13 and the like are formed, the cost increases,
Further, since the boss mounting plate 11 is configured to be placed on the box structure 12, there is a problem that the degree of freedom in the vertical position of the boss mounting plate 11 is reduced as described above.

Therefore, an object of the present invention is to provide a frame structure for a battery-operated three-wheel forklift which is low in cost, high in strength, resistant to thermal distortion, and has a high degree of freedom in vertical position of the boss mounting plate.

[0007]

In order to solve the above-mentioned problems, the present invention provides a lower plate having an arc portion which is separated from the outermost locus of a steered tire which turns around a vertical axis to steer a vehicle by a predetermined distance. And provided on the lower plate,
A back plate extending in a direction substantially perpendicular to the lower plate, and a pair provided so as to be separated from each other and in contact with both the lower plate and the back plate, and extending in a direction substantially perpendicular to the lower plate. And a boss mounting plate that has a boss that supports a steering tire and that is provided so as to be in contact with the back plate by being sandwiched between a pair of steer axle plates. ..

[0008]

According to the present invention, the arc portion of the lower plate is separated from the outermost locus of the steered tire by a certain distance, and splashes of the tire and splashes of mud are prevented from entering the lower plate. Also, the boss mounting plate is sandwiched between a pair of steer axle plates,
The degree of freedom in the vertical position of the boss mounting plate is increased. Further, the boss mounting plate is in contact with the back plate and the pair of steer axle plates and is surrounded by these plates from three directions, so that the influence of thermal strain during welding is reduced. Furthermore, a ladder-like structure is formed by each plate, so that the cost and strength of the frame structure can be reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 to 7 are views showing an embodiment of a frame structure of a battery type three-wheel forklift according to the present invention. First, the configuration will be described.

1 to 6, reference numeral 21 is a lower plate extending in a substantially horizontal direction, and the lower plate 21 is rotated about a vertical axis L to steer the vehicle, which is an outermost locus of a steering tire (not shown). It has an arc portion 21a which is separated from S by a certain distance. A back plate 22 is provided on the lower plate 21, and the back plate 22 extends in a direction substantially perpendicular to the lower plate 21. The lower plate 21 extends from the back plate 22 to the rear of the vehicle, and an arc portion 21a is formed near the center of the rear. Reference numerals 23 and 24 denote a pair of steer axle plates that are separated from each other, and each of the steer axle plates 23 and 24 is a lower plate.
It is provided so as to be in contact with both 21 and the back plate 22, and is welded to both plates. The pair of steer axle plates 23, 24 extends in a direction substantially perpendicular to the lower plate 21. Reference numeral 25 denotes a boss mounting plate, and the boss mounting plate 25 has a boss 25a for supporting a steered tire. Also, the boss mounting plate 25 is the steer axle plates 23, 24.
It is provided so as to be sandwiched between and contact the back plate 22.

On the other hand, 31 is a front center plate, and a U-shaped opening 31a is formed in the lower part of the front center plate 31, and the height of the opening is made lower than that of the battery under cover 32. Harness 62
A sufficient space is ensured for passing through the opening 31a. An opening 22a is formed in the lower portion of the back plate 22 as well as the front center plate 31. Numerals 33 to 38 are reinforcing ribs arranged on the lower plate 21 for mounting the battery 39, and the reinforcing ribs 34 and 35 are arranged on both sides of the openings 31a and 22a.

The battery undercover 32 is a reinforcing rib 3
It is arranged so as to straddle 4, 35 and reinforcing ribs 36, 37,
The gap between the battery undercover 32 and the plates 22 and 31 is minimized to prevent water from entering from above. Back plate 22 of boss mounting plate 25
Notch 25 in the corner between
b, and the size of the cutout 25b is the cable cover
61 is set to be smaller than the size that covers the corner portion.

Holes 23a and 24a are formed in the upper portions of the steer axle plates 23 and 24, and the air between the steer axle plates 23 and 24 flows out through the holes 23a and 24a. The cable cover 61 is surrounded by the lower plate 21, the back plate 22, the steer axle plate 23, and the boss mounting plate 25.
It has a shape that seals the space of 62, and of course there is sufficient space for air to pass through.

Reference numerals 41 and 42 denote controller mounting brackets.
41 and 42 are welded to the steer axle plates 23 and 24, but have a shape in which the mass is large in order to promote heat dissipation by the heat conduction of the controller unit 43 that controls the vehicle operation. Reference numeral 44 denotes a controller plate, and the controller plate 44 is arranged so as to cover the upper U-shaped structure portion composed of the back plate 22 and the steer axle plates 23, 24. Reference numeral 45 denotes a controller base, and the controller base 45 is formed with a notch 45a having substantially the same shape as the notch 25b of the boss mounting plate 25.

The air flow of this embodiment is shown by the arrows in FIGS. 3 and 4. That is, in the lower part of the frame,
A water resistant structure is formed by the battery under cover 32, and air is passed through the tunnel through the front center plate.
It flows in through the opening 31 a of the back plate 31, flows backward, and flows out through the opening 22 a of the back plate 22. At the rear corner, the cable cover 61 forms a water and dust resistant structure, and air flows upward through the tunnel portion through the opening 22a of the back plate 22 as described above. In the upper controller mounting area, the controller plate
The water and dust resistant structure from above is formed by 44, and the air that has flowed in through the notch 25b of the boss mounting plate 25 and the notch 45a of the controller base 45 convects in the controller space, and steer axle plates 23 on both sides, It flows out from the 24 holes 23a, 24a. Of course, a gap is formed between the steer axle plates 23, 24 and the counter weight (not shown) behind the steer axle plates 23, 24, and air also flows out from the gap.

Movement of the battery 39 in the vehicle front-rear direction is restricted by the back plate 22 and the front center plate 31, and movement in the vehicle width direction is restricted by stoppers (not shown) arranged at both ends in the vehicle width direction. Battery 39
Width may change due to battery replacement etc.,
The solid line in FIG. 5 shows the minimum width battery 39 and the phantom line in FIG. 5 shows the maximum width battery 39. 51 and 52 are spacers, and the spacers 51 and 52 are mounted on the battery undercover 32 on the reinforcing ribs 35 and 36. As shown in FIG. 5, the reinforcing ribs 35 and 36 have the same height,
Lower than 34, 37, 38 height. The heights of the reinforcing ribs 33 and 38 are equal to each other, and are equal to the height of the reinforcing ribs 34 and 37 plus the thickness of the battery under cover 32, or lower than the height of the reinforcing ribs 34 and 37. Therefore, the pair of battery under covers 32 are inclined so as to be lowered toward the center of the vehicle. A water drain hole 21b is formed in the center of the lower plate 21, and water drain cutouts 21c are formed at both ends in the vehicle width direction.

If the battery 39 has a drain hole 39a near the center as shown in FIG.
The water discharged from 39 directly drops to the lower plate 21 and is discharged from the water drain hole 21b. On the other hand, the battery 39 is shown in FIG.
When the water drain holes 39a are provided at both ends in the vehicle width direction, as shown in (b) of FIG. Is discharged. Further, even if water enters between the reinforcing ribs 33 and 34 and between the reinforcing ribs 37 and 38, the water is discharged from the drainage notch 21c of the lower plate 21. In this embodiment, the battery under cover 32 is inclined so that it becomes lower toward the center of the vehicle, but it may be inclined so that it becomes lower toward the outside in the vehicle width direction as shown in FIG. 7. . in this case,
Reinforcement rib 3
The drain hole 21 is provided between the reinforcing ribs 37 and 38 and between the reinforcing ribs 37 and 38.
b is formed.

The electric power steering unit and chain units (none of which are shown) are arranged outside the steer axle plate 23 shown in FIG. 4A, and the hydric tank and the like are shown in FIG. 4B. It is arranged outside the stepper 24. According to the above configuration, the following effects can be obtained.

First, since the arcuate portion 21a of the lower plate 21 is separated from the outermost locus S of the steered tire by a certain distance, splashes of tire splashes and splashes of mud penetrate the lower plate 21. It can be prevented as much as possible, and the dirt and the like of the vehicle body can be prevented. Second
In addition, since the boss mounting plate 25 is provided so as to be sandwiched between the pair of steer axle plates 23 and 24, the degree of freedom in the vertical position of the boss mounting plate 25 can be increased.

Third, the boss mounting plate 25 includes a back plate 22 and a pair of steer axle plates 23,
Since these plates are in contact with 24 and are surrounded by these plates from three directions, it is possible to reduce the influence of thermal strain when welding the boss mounting plate 25. Fourthly, since each plate forms a ladder-like structure, it is possible to secure a sufficient strength even when the steer axle unit is attached to the boss 25a with a simple structure, thereby lowering the cost and increasing the cost of the frame structure. Strengthening can be achieved.

Fifth, since units such as a hydric tank and a chain unit are arranged outside the steer axle plates 23 and 24, even if water, mud or pebbles enter the lower plate 21, Steer axle plate 23,
With 24, it is possible to prevent these from adhering to or colliding with each unit, and prevent each unit from being soiled or damaged.

Sixth, while the cable harness 62 is made water and dust resistant by the battery under cover 32, the cable cover 61, etc., air flow can be generated within the hermetically sealed structure, and the cable harness 62 is positively provided around the controller 43. Since the air flow is generated in a dynamic manner, it is possible to achieve both cooling and sealing at a low cost, and in the running state, the controller unit 43 can be actively cooled by the air flow. It is possible to prevent troubles due to heat generation of 43.

[0023]

According to the present invention, since the arc portion of the lower plate is separated from the outermost locus of the steered tire by a certain distance, splashes of tire splashes, splashes of mud, etc. intrude on the lower plate. It is possible to prevent this from happening and prevent the vehicle body from becoming dirty. Further, since the boss mounting plate is sandwiched between the pair of steer axle plates, the degree of freedom in the vertical position of the boss mounting plate can be increased.
Furthermore, since the boss mounting plate is in contact with the back plate and the pair of steer axle plates and is surrounded by these plates in three directions, the influence of thermal strain during welding can be reduced. Furthermore, since each plate forms a ladder-like structure, the cost and strength of the frame structure can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of an embodiment of a frame structure of a battery type three-wheel forklift according to the present invention, as viewed from the left rear side of a vehicle.

FIG. 2 is a perspective view of a main part of the frame structure in FIG. 1 viewed from the front left side of the vehicle.

3 is a cross-sectional view of a main part of the frame structure in FIG. 1 viewed from the left side of the vehicle.

FIG. 4 is a top view of a main part of the frame structure in FIG.

FIG. 5 is a diagram showing a mounted state of the battery in FIG.

6 is a perspective view of the battery in FIG. 2,
(A) shows an example in which the drainage hole is provided in the center,
(B) shows an example in which the drain holes are distributed to the left and right.

FIG. 7 is a view showing another embodiment of the reinforcing rib in FIG.

FIG. 8 is a perspective view of a frame structure of a conventional battery type three-wheel forklift.

FIG. 9 is a perspective view of a frame structure of another conventional battery type three-wheel forklift.

FIG. 10 is a top view of the frame structure in FIG.

[Explanation of symbols]

 21 Lower Plate 21 Arc Part 22 Back Plate 23, 24 Pair of Steer Axle Plate 25 Boss Mounting Plate 25a Boss

Claims (1)

Claim: What is claimed is: 1. A lower plate having an arc portion which is separated from the outermost locus of the steered tire for turning the vehicle about a vertical axis by a predetermined distance, the lower plate being provided on the lower plate. A back plate that extends in a direction substantially perpendicular to the lower plate, and a pair that is spaced apart from each other and contacts both the lower plate and the back plate, and that extends in a direction substantially perpendicular to the lower plate. A battery-operated type 3 characterized by having a steer axle plate of No. 1 and a boss that supports a steering tire, and a boss mounting plate that is provided so as to be sandwiched between a pair of steer axle plates and contact the back plate. Frame structure of wheel forklift.