JPS6016536B2 - industrial vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention connects one of the front wheels and rear wheels located on the side of a vehicle body, which becomes a first driving wheel, and the other wheel, which becomes a second driving wheel, through a sprocket and a chain. At the same time, the front and rear wheels located on both sides of the vehicle body are independently driven and controlled to steer the wheels, and a lift arm is installed at the front of the vehicle for raising and lowering working equipment such as buckets. This relates to industrial vehicles equipped with.

The conventional device is an IJ for lifting and lowering work equipment such as buckets.
The foot arm is operated by hydraulic equipment such as a lift cylinder, and a control device for the lift cylinder,
Hydraulic piping is required, leading to problems such as high costs and complicated hydraulic piping.

The present invention aims to provide a new industrial vehicle that eliminates the lift arm operating cylinder in order to solve the problems of conventional devices. Alternatively, one support shaft of the rear wheel is movably arranged between the front and rear with respect to the vehicle body frame, and the front and rear wheels are rotatably connected to each other in the middle of the front and rear wheels, and the chain and sprocket are stored inside. The base end of the lift arm is rotatably connected to the outer surface of one of the pair of chain cases, and the middle part of the lift arm and the other chain case are connected by a link section. It is located at a point that is rotatably connected through the village.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the figure, 1 is the vehicle body frame, 2R and 2L are the right and left front wheels that are the first drive theory, and 3R and 3L are the right and left front wheels that are the second drive theory. The front wheels 2R and 2L are the rear wheels, and the front wheels 2R and 2L are equipped with an engine E mounted within the vehicle body frame 1, a variable displacement hydraulic pump PR,
The drive is controlled by PL and hydraulic motors M and ML. That is, the right front wheel 2R has a hydraulic motor M attached to the end of its shaft 2RS, and the hydraulic motor MR uses pressure oil supplied from a variable displacement hydraulic pump PR driven by an engine E. It is driven by being rotated by. Further, the left front wheel 2L is similarly driven by a hydraulic motor ML and a variable displacement hydraulic pump PL attached to two shafts thereof.

Therefore, the front right wheel 2R and the front left wheel 2L are discharge bases of the variable displacement hydraulic pumps PR, PL, respectively, and their rotational speeds or directions are independently controlled by changing the discharge direction. First sprockets 4R, 4L, clutches 5R, 5L, and brake device 6 are attached to the shafts 2RS, 2LS from the hydraulic motor M old and ML sides, respectively.
R, 6L are installed, shafts 2RS, 2LS
One end of the first chain case 7R, 7L is rotatably attached to the part where the first sprocket 4R, 4L is attached so as to cover the first sprocket 4R, 4L,
Inside the other ends of the first chain cases 7R, 7L is a shaft 9.
Second chain sprocket 8R fixed to R, 9L
, 8L are rotatably attached to the first chain cases 7R, 7L'.

Further, the first sprockets 4R, 4L and the second sprockets 8R, 8L' are respectively connected to the first chain 10R.
, 10L are spanned. On the other hand, fourth sprockets 11R and 11L are fixed to the shafts 3RS and 3LS of the rear wheels 3R and 3L, respectively.
One end of the second chain case 12R, 12L is rotatably attached to the part where the fourth sprocket 11R, 11L is attached so as to cover the fourth sprocket 11R, 11L, and the second chain case 12R , 12L has a second sprocket 8 on the shafts 9R, 9L.
The third sprue is fixed in parallel with R and 8L.

The brackets 13R and 13L are rotatably attached.
Further, second chains 30R, 30L are stretched between the third sprockets 13R, 13L and the fourth sprockets 11R, 11L, respectively. Reference numeral 13 denotes a support shaft that rotatably supports the shafts 3RG and 3LS, and is slidably mounted in the front-rear direction within a pair of upper and lower guide rails 14R and 14L fixed to the rear of the vehicle body frame 1. There is.

The distance between the front and rear wheels is determined to be an arbitrary distance by limiting the opening degrees of the chain cases 7R, 7L and 12R, 12L with adjustable length chains (not shown).

15 has a base end portion and an intermediate portion of the first chain case 7R. 7L and second chain case 12R, 12L
As shown in FIG. 1, the base end of the L-shaped lift arm 15 is rotatably connected to the middle part of the second chain case 12L by a pin 16. , one end is rotatably connected to the middle of the first chain case 7L by a pin 17, and is rotatably connected to the other end of the link member 18 via a pin 19.

Furthermore, a bucket 6 is connected to the tip of the lift arm 15 via a pin 20.

A pair of left and right lift arms 15 are provided, and the right IJ foot arm has the same structure as described above. Furthermore, 31 is the driver's seat, 32R, 32L, 33R, 33L'
This is a stopper member that is fixed to both sides of the guide rails 14R, 14L and restricts the range of movement of the support shaft 13.
Next, the operation of the apparatus of the present invention configured as described above will be explained.

If the variable displacement hydraulic pumps PR and PL are operated from the states shown in Figs. 1 and 2 using respective control levers (not shown), the vehicle can move forward or backward or turn to the right in the same way as conventional hydraulically driven vehicles. When the inching brake pedal (not shown) is depressed, the clutches 5R and 5L become half-clutched and the brake devices 6R and 6L are gradually operated to reduce the front wheel speed. .

The characteristic feature of the device of the present invention is that when the pinching brake is depressed, even if the rotational speed of the front wheels 2R, 2L decreases, the rear wheels 3R, 3L continue to operate as the first sprockets 4R, 4L and the first chain 10R. , 10L, second sprocket 8R
, 8L, third sprocket 13R, 13L, second chain 12R, 12L and fourth sprocket 11R
, 11L, front wheels 2R, 2L and rear wheel 3R.
, 3L, the support shaft 13 is moved to the guide rail 14R,
14L', and by this forward movement of the support shaft 13, the first chain cases 7R, 7L and the second chain cases 12R, 12
L is displaced as shown by the two-dot chain line in the first figure, and the lift arm 15 is raised.

When the lift arm 15 is raised, the operating lever is operated to neutral to set the discharge amount of the variable discharge amount hydraulic pumps PR, PL to 0, and the rear wheels 3R, 3L stop rotating. Also,
When lowering the lift arm from a raised position, with the inching brake pedal depressed, use the operating lever to change the discharge direction of the variable discharge volume hydraulic pumps PR and PL, and reverse the rear wheels 3R and 3L. For example, the support shaft 13 slides rearward, and the lift arm 15 descends, contrary to the above-mentioned upward movement.

In the device of the present invention configured and operated as described above,
The lift arm 15 can be raised and lowered using the power of the vehicle hydraulic drive system without using a lift cylinder to raise and lower the lift arm 15, and it does not require a special power source for raising and lowering the lift arm, and is similar to conventional It can be manufactured at low cost without causing malfunctions or oil leaks due to hydraulic-related failures, unlike the lifting device of 2005, and has the effect of greatly omitting assembly work such as piping for working parts.

Further, when the lift arm 15 is raised, the wheel base is shortened, making it easier for the vehicle to skid steer and turn, which has the effect of further improving work efficiency. Furthermore, when storing the vehicle in a narrow garage, the rear wheels can be moved slightly forward, making it possible to store the vehicle in a narrow space.

Note that the present invention is not limited to the embodiments described above, and various modifications such as the following are possible.

■ Apply working devices such as forks and rollers to the tip of the lift arm.

■ The rear wheels should be the first drive theory, and the front wheels should be the second drive theory.

■ The front wheel is supported by a support shaft and configured to slide within the guide rail.

■ Changing the sliding movement between the support shaft and guide rail to an engagement means such as a rack and pinion.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, with FIG. 1 being an overall side view and FIG. 2 being a drive system diagram thereof. 1...Vehicle frame, 2R, 2L...Front wheel, 3R,
3L...Rear wheel, 7R, 7L, 12R, 12L. ...Chain case, 10R, 10L, 30R, 30L...Chain, 4R, 4L, 8R, 8L, 11R, 11L, 13
R, 13L... Sprocket, 15... Lift arm, 18
...link member. Figure 2 Figure 1

Claims (1)

[Claims] 1 Among the front wheels and rear wheels located on the sides of the vehicle body, one wheel that will become the first drive wheel and the other wheel that will become the second drive wheel are connected via a sprocket and a chain, and The vehicle is steered by driving and controlling the left and right front and rear wheels independently, and the tip protrudes toward the front of the vehicle.A working device such as a bucket is attached to the tip, and the base rotates around the vehicle body frame. In an industrial vehicle equipped with a movably supported lift arm, at least one support shaft of the front wheel or the rear wheel is disposed so as to be movable in the longitudinal direction with respect to the vehicle body frame, and the front and rear wheels are connected to the front and rear wheels. A pair of chain cases are connected to each other so as to be rotatable at the middle part thereof, and a chain and a sprocket are housed inside. An industrial vehicle characterized in that the intermediate portion of the lift arm and the other chain case are rotatably connected via a link member.