JPS6315408Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention relates to an engine control device for wheel-type or crawler-type vacuum loaders, etc., which can be equipped with a loader at the front and a vacuum device at the rear. be.

(b) Prior art The technology of providing working tools at the front and rear of the vehicle body has been well known as disclosed in Japanese Utility Model Application Publication No. 71601/1983.
In addition, the technology of installing a stopper to restrict the stroke of the foot pedal was developed in the 1970s.
The technology is known as disclosed in Japanese Patent No. 23902.

(c) Problems that the invention aims to solve Many construction machines and civil engineering machines are multipurpose machines that can perform multiple tasks with one machine.

In particular, there is a high demand for backhoe equipment, which has a loader bucket at the front and a backhoe for digging trenches and transporting soil, because it can perform two functions with one machine.

Conventionally, emphasis has been placed on the loader work at the front of such backhoe devices, and since the backhoe is often installed as an attachment, there is no engine control device attached to the operating side of the backhoe. It was.

Particularly in the case of backhoe work, since the work is not done while the machine is moving, the operator must park the machine at a certain spot, dig a trench of a certain length or dig a certain width of soil, and then He goes to the front driver's seat, runs the aircraft, changes position, and then returns to the backhoe side to continue work.

Therefore, the traveling transmission, steering device, and engine rotation control device are all installed on the front side, and on the rear side, in order to operate the backhoe, there is a high-pressure oil extraction device and a mounting rail 28 for the backhoe device.
The engine rotation is controlled by turning around and checking the operation column 2 each time.
9 was operating the accelerator lever 15.

The present invention improves on this point and also includes a foot accelerator that can be operated from the seated position when operating the rear backhoe.

Furthermore, since the foot accelerator pedal provided at the rear is not used for driving like the main foot accelerator pedal at the front, high-speed rotation exceeding the load capacity of the bucket is unnecessary.

The bucket capacity is determined to be much larger than the full throttle of the engine, and pressing the accelerator pedal to full throttle will waste horsepower, increase work speed, become dangerous, and increase noise.

The same goes for the front bucket capacity and earth removal plate capacity, which are designed to have more leeway than full throttle, but if you limit the amount of depression of the front foot accelerator pedal, the following problems will occur. That's what I do.

In other words, when transporting this machine on general roads, the maximum speed is slow for civil engineering construction equipment, which is about 15 km/h at full throttle, so if you limit the amount of accelerator pedal depression, other vehicles will It becomes a hindrance to other vehicles.

Therefore, the rotation width of the front foot accelerator pedal cannot be restricted, so if you limit only the rotation width of the rear foot accelerator pedal and always provide a stopper, it will prevent the operation of the linked accelerator lever and front foot accelerator pedal. Since the range of rotation is sometimes limited, the stopper is designed so that it only works when doing backhoe work.

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

A bucket 1 is installed in the front, and a bucket 2 is installed in the rear.
In the backhoe device equipped with the driver's seat 4, the driver's seat 4 is rotatable back and forth, a front foot accelerator pedal 7 is provided at the forward-facing position of the driver's seat 4, and a rear foot accelerator pedal 8 is provided at the rear-facing position of the driver's seat 4, The rear foot accelerator pedal 8 is provided with a stopper arm 35 that limits the stroke of depression toward the high engine speed side, and the stopper arm 3
A stopper 34 that engages with the driver's seat 4 is provided at a position facing the driver of the support 32 that rotates together with the driver's seat 4.

(e) Embodiment The purpose and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

FIG. 1 is an overall side view of the vacuum loader.

It shows a four-wheeled loader with two front wheels 5, 5 and two rear wheels 6, 6, and is configured to be steered by bending the center by rotating a steering handle 3.

A bucket 1 for a loader is provided at the front, and a bucket 1 is operated by a bucket operating lever 11 on the side of a driver's seat 4 for two operations: up and down and rotation of the bucket 1.

12 is the travel gear shift lever and the transmission case 30
It is configured to allow for speed change during travel. An engine is disposed within the engine room 13, and power from the engine is transmitted to the transmission case 30.

The rotation of the engine can be controlled by both the accelerator lever 15 and the front foot accelerator pedal 7, and in the present invention, an interlocked rear foot accelerator pedal 8 is also provided at the rear.

The driver's seat 4 is configured to be rotatable, and in the case of loader work, the operator only has to face forward from the driver's seat 4 and operate the accelerator lever 15 or the front foot accelerator pedal 7, and the operator can perform backhoe work. In this case, the driver's seat 4 is rotated to the 4' position and the hydraulic operating lever 9 on the operating column 10 of the vacuum cleaner 2 is operated.

When operating the backhoe 2, the operator often moves up and down and rotates the backhoe at the same time, and since two hydraulic control levers are operated with both hands, it is difficult to operate the accelerator lever by hand.

Therefore, in the present invention, a rear foot accelerator pedal 8 is provided at the rear.

A mounting rail 28 is provided on the body side, and a fitting protrusion 27 is fitted onto the mounting rail 28 to attach the backhoe 2, and the backhoe 2 is hydraulically movable from side to side on this rail.

FIG. 2 is a perspective view of the engine rotation control device.

The accelerator lever 15 is pivotally supported by a pivot body 27,
It is pressed against the pivot body 27 by the detent ball 18 and fixed by friction at the rotational position of the accelerator lever 15.

In particular, when the detent ball 18 enters the idling hole 27a of the pivot 27, the engine rotation becomes idling rotation, and below this position, the engine stops.
This is shown by the resistance generated in the rotation of 5.

A bell crank 16 is loosely fitted to the tip of the pivot part of the accelerator lever 15 to the pivot body 27, and the longer arm is configured to be engaged with the engagement arm 14 of the accelerator lever and forced to rotate. ing.

The bell crank 16 is always urged in the direction of contacting the engagement arm 14 by a biasing spring 16c.
When the accelerator lever 15 is rotated in the direction of the arrow, the bell crank 16 is rotated by the engagement arm, and the governor lever of the engine is rotated in the speed increasing direction by the link 17 pivotally connected to the attachment hole 16b.

A link 19 is pivotally connected to the mounting hole 16a of the bell crank 16, and the link 19 is connected to the arm 25 of the front foot accelerator pedal 7, and the link 22 is further connected to the arm 25 of the front foot accelerator pedal 7.
Since the foot accelerator pedal 8 is also linked to the rear foot accelerator pedal 8, both the foot accelerator pedals 7 and 8 also move to the depressed position by the amount of rotation of the accelerator lever 15.

This position is always the minimum rotation, and when loader work or jackhoe work is performed, the load becomes heavier, and when horsepower is desired, the operator depresses the foot accelerator pedals 7 and 8, and the bell crank 16 is released from the engagement arm 14 of the accelerator lever 15. Separately, the link 17 provides further increased rotation speed.

Then, as soon as the load condition is finished, stop pressing down on the front and rear foot accelerator pedals 7 and 8.
The bell crank 16 returns to the position of the engagement arm 14 by the biasing spring 16c, the accelerator lever 15 rotates as set, and the front and rear foot accelerator pedals 7 and 8 also return to their positions before being depressed.

Reference numeral 20 denotes a pivot shaft device for the front foot accelerator pedal 7 , and reference numeral 23 denotes a pivot shaft device for the rear foot accelerator pedal 8 .

The arm 24 is directed downward so that the front foot accelerator pedal 7 and the rear foot accelerator pedal are depressed in the same direction relative to the operator's posture. 26 is a decompression link device.

In a device in which the accelerator lever 15, the front foot accelerator pedal 7, and the rear foot accelerator pedal 8 are linked together, the present invention provides a mechanism for attaching the lower end of the support body 32 of the driver's seat 4, which is rotated during backhoe work. A stopper 34 is provided.

The driver's seat 4 is supported on a step of the fuselage by a pivot tube 33, and is configured to be rotatable together with an internal support 32. This support 32
At the same time, the stopper 34 can be rotated.

The stopper 34 is provided in the direction of the support body 32 facing the driver, and engages with the stopper arm 35 only when the driver's seat 4 faces toward the rear foot accelerator pedal 8. It is structured like this. When the stopper arm 35 of the rear foot accelerator pedal 8 engages with the stopper 34, the rotation of the engine cannot be increased beyond this rotation. The rotational speed is set to be a sufficient number of rotations for the work to be performed by the excavator 2.

A stopper arm 35 that engages with this stopper 34 is provided at the base of the rear foot accelerator pedal 8.

When operating a loader or dozer with the driver's seat 4 facing forward, the stopper 34 is set at 34'.
Since it is in this position, it does not engage with the stopper arm 35 and can be pressed to full throttle when driving on the road.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, in civil engineering construction machines that are equipped with a bucket or earth removal plate at the front and a backhoe device can be attached to the rear, a foot accelerator pedal is installed at the rear of the machine that the operator can operate with his foot while seated during backhoe work. In addition, by providing a stopper that limits the depression stroke of the foot accelerator pedal, the rated rotation speed during backhoe work (usually set lower than the rated rotation speed when driving)
This enables safe and economical work to be done.

Second, when you are not working or want to operate slowly, the engine speed can be reduced immediately by releasing the accelerator pedal.

Moreover, with this configuration, the engine has low fuel consumption and low noise.

Thirdly, when the front foot accelerator pedal 7 is depressed, the stopper 34 does not engage with the stopper arm 35 of the rear foot accelerator pedal 8, so when driving on the road, the engine can run at maximum speed and the maximum speed can be secured. It is.

As described above, this is a device that can provide a machine that is safe, has low fuel consumption, and has low noise.

[Brief explanation of the drawing]

FIG. 1 is an overall side view of the vacuum loader, and FIG. 2 is a perspective view of the engine rotation control device. 1...Bucket, 2...Buckhoe, 4...Driver's seat, 7...Front foot accelerator pedal, 8...
Rear foot accelerator pedal, 15... accelerator lever, 32... support body, 34... stopper, 3
5... Stopper arm.

Claims (1)

[Scope of utility model claims] A bucket 1 is installed in the front, and a bucket 2 is installed in the rear.
In the backhoe device equipped with the driver's seat 4, the driver's seat 4 is rotatable back and forth, a front foot accelerator pedal 7 is provided at the forward-facing position of the driver's seat 4, and a rear foot accelerator pedal 8 is provided at the rear-facing position of the driver's seat 4, The rear foot accelerator pedal 8 is provided with a stopper arm 35 that limits the stroke of depression toward the high engine speed side, and the stopper arm 3
5. A backhoe device characterized in that a stopper 34 that engages with the driver's seat 4 is provided at a position facing the driver of a support 32 that rotates together with the driver's seat 4.