JPH11139789A - Three-wheel type forklift - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the stability at the time of braking by arranging a rear wheel in rear of a vehicle body at a right and a left center of gravity positions of a three-wheel type forklift. SOLUTION: In a forklift 1, electric devices such as a battery and hydraulic devices such as an oil tank are loaded asymmetry inside a car body 2. Appearance structure is formed asymmetry so as to obtain the special structure that a driver gets on the lift sideways, and weight is eccentrically applied to a right side of the forklift 1. Deviation of the weight is set as an offset quantity (e) of the center of gravity position from the center of a vehicle body to the right side. At this stage, a rear wheel 14 is moved right by the same quantity with the offset quantity (e) from the center of the vehicle body for arrangement. With this structure, even in the case where the braking force P is applied to the rear wheel 14, since the rear wheel 14 is offset by the same quantity with the center of gravity of the forklift 1, offset quantity (e) to the rear wheel 14, to which the braking force is applied, becomes zero, and a rotary moment M to be obtained by multiplying the braking force P by the offset quantity (e) becomes zero.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-wheel type forklift for improving the stability of a vehicle body during braking.

[0002]

2. Description of the Related Art In a conventional three-wheel type forklift, two wheels are arranged on the left and right sides in front of a lower part of a vehicle body, and one wheel is arranged in the center of the rear body.

[0003]

In many vehicles including a three-wheel type forklift, it is desirable that the left and right centers of gravity be located at the center of the vehicle body. However, in a three-wheel type forklift, various devices such as an electric device such as a battery, a hydraulic device such as an oil tank, and a riding device must be mounted inside the vehicle body. It is impossible to position the left and right center of gravity of the three-wheel type forklift at the center of the vehicle body. Therefore, as shown in FIG. 2, an offset amount e is generated between the left and right centers of gravity and the center of the vehicle body. This offset amount e
As a result, during braking, a rotational moment M obtained by multiplying the offset amount e by the braking force P is generated, and the three-wheel type forklift is in an unstable state.

[0004]

According to the present invention, there is provided a three-wheel type forklift comprising a vehicle body and a cargo handling device in front of the vehicle body. In the above, the rear wheel is a three-wheel type forklift disposed behind the vehicle body at the position of the left and right center of gravity of the three-wheel type forklift to solve the above-mentioned problem.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an example of the present invention, a description will be given of a horizontal sitting forklift in which the present invention can be most suitably implemented.
As shown in FIG. 3 and FIG. 4, the forklift 1 (hereinafter referred to as a forklift) is a vehicle body 2 and a cargo handling device 3 that performs cargo handling work in front of the vehicle body 2.

The vehicle body 2 is provided with a driver's cab 4 arranged at the center, a pair of left and right straddle legs 5 projecting downward from the front, and the driver's cab 4 has a head guard 6 for covering the periphery to protect the driver, and a seat. 7, instrument panel 8,
The instrument panel 8 includes a cargo handling lever 10 for operating a cargo handling device, a steering handle 11 for instructing the traveling direction of the forklift 1,
The accelerator pedal 1 for instructing the traveling speed is on the floor 9
2. A brake pedal 13 for instructing a braking force is provided.

A steering handle 11, an accelerator pedal 12, a brake pedal 13
The rear wheel 14 turns, drives and brakes as instructed by the driver.
The front end of each of a pair of left and right straddle legs 5 at the lower front of the vehicle body 2 is provided with a front wheel 15 that rotates with the rotation of the rear wheel 14.

The cargo handling device 3 moves in the front-rear direction along the straddle leg 5 in order to perform a cargo handling operation, and a pair of left and right forks 16 in front of the cargo handling device 3 for directly loading a load move up and down along the cargo handling device 3. And it is a structure that tilts back and forth for stability of the load.

With these structures, forklift 1
The specific cargo handling work 3 is that the driver puts the car body 2 on the seat 7.
, The steering handle 11 is operated with the left hand, the cargo handling lever 10 is operated with the right hand, and the accelerator pedal 12 and the brake pedal 13 are operated with the right foot.

In the forklift 1 according to the present embodiment, not only the mounting position (not shown) of an electric device such as a battery or a hydraulic device such as an oil tank inside the vehicle body 2 is asymmetrical, but also the driver can turn the device sideways. The appearance structure is also asymmetric due to the special structure for riding, and the weight is biased to the right side of the forklift 1.

The deviation of the weight becomes an offset amount e from the center of the vehicle body 2 to the right side of the center of the vehicle body 2 as shown in FIG. At this time, the rear wheel 14 of the present invention is moved rightward by an amount equal to the offset amount e from the center of the vehicle body 2 and disposed. In this structure, even when the braking force P is applied to the rear wheel 14 during traveling, the rear wheel 14 is offset by the same amount as the center of gravity of the forklift 1, and therefore, the offset amount e with respect to the rear wheel 14 to which the braking force P is applied. Becomes 0 (zero), and the rotational moment M of the vehicle body 2 obtained by multiplying the braking force P by the offset amount e also becomes 0.

With such a configuration, the instability of the forklift 1 during braking is eliminated, and the forklift 1 can be safely stopped.

[0013]

According to the present invention, the structure as described in the above embodiment can secure the stability during braking. It is obvious that stability during braking is important for a vehicle such as a three-wheel type forklift, and it is clear that unstableness may lead to an accident. Such problems can be easily and reliably improved by using the apparatus of the present invention. In addition, in the side-seat type forklift described in the embodiment, in addition to the above-described effects, the effect that the floor can be enlarged by moving the rear wheel to the right side can be obtained at the same time.

[Brief description of the drawings]

FIG. 1 is a wheel layout diagram of a three-wheel type forklift embodying the present invention.

FIG. 2 is a wheel layout diagram of a conventional three-wheel type forklift.

FIG. 3 is a side view of the side sitting type forklift.

FIG. 4 is a rear view of the horizontal sitting type forklift.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side sitting type forklift 2 Body 3 Cargo handling device 4 Operator's cab 5 Straddle leg 6 Head guard 7 Seat seat 8 Instrument panel 9 Floor 10 Cargo handling lever 11 Steering handle 12 Accel pedal 13 Brake pedal 14 Rear wheel 15 Front wheel 16 Fork

Claims (1)

[Claims] 1. A three-wheel type forklift comprising a vehicle body and a cargo-handling device in front of the vehicle body, wherein two wheels are disposed on the lower left and right of the vehicle body and one wheel is disposed on the rear side. A three-wheeled forklift arranged behind the vehicle at the center of gravity of the wheeled forklift.