JPH0542665Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an operating device for a concrete mixer vehicle that can simultaneously control drum rotation and engine control of the concrete mixer vehicle.

[Prior art] Generally, in a concrete mixer vehicle, power is extracted from the vehicle's engine, the drum is rotated by a hydraulic pump/motor, and fresh concrete is charged, kneaded, and stirred by rotating the drum in the normal direction. On the other hand, fresh concrete is discharged by reversing the drum.

Further, the rotational speed of the drum can be changed arbitrarily to obtain an appropriate discharge speed commensurate with the conditions of the kneading, stirring and discharge site to obtain the best fresh concrete quality.

The rotation of these drums is controlled by controlling a hydraulic pump and an engine. That is,
The forward/reverse control of the drum is performed by changing the oil discharge direction of the hydraulic pump, and the rotation speed control of the drum is performed by changing the discharge amount of the hydraulic pump in a low rotation speed range. When high speed rotation is required, this is done by increasing the engine rotation speed.

For these controls, the engine-side mechanism and the hydraulic pump-side mechanism are connected to a control lever installed in the driver's seat of the concrete mixer vehicle by rods or cables, respectively, and the hydraulic pump is controlled by operating the control lever in the left and right directions. The engine is controlled by vertical operation.

The conventional operating device described above has two systems: a control system for the flow rate and discharge direction of the hydraulic pump, and a control system for the engine, so the control system has a large number of operating parts.
It is complex and less economical. Furthermore, there are two operating directions of the operating lever, ie, left-right direction and up-down direction, which may lead to operational errors.

Therefore, an operating device for a concrete mixer vehicle was developed, for example, as disclosed in Japanese Utility Model Application Publication No. 59-38012.

This operating device includes an operating lever, a rod link pivotally connected to the operating lever, an intermediate link pivotally connected to the rod link, a cam lever rotatably engaged with a roller provided on the intermediate link, and a cam lever pivotally connected to the cam lever. A lever for controlling the tilting angle of the hydraulic pump, an accelerator cam coupled to the rod link, a roller slidingly in contact with the cam edge of the accelerator cam, and an accelerator coupled to this roller and coupled to the engine accelerator. It is equipped with a link.

According to this operating device, the hydraulic pump and engine can be controlled only by rotating the operating lever in one dimension, making the operation easy and preventing operational errors. Furthermore, an operating device that performs one-dimensional rotational operation using electrical control has also been developed.

[Problem to be solved by the invention] However, the operating device for the concrete mixer vehicle disclosed in the above publication is equipped with a cam lever for controlling the tilting angle of the hydraulic pump and an accelerator cam for controlling the engine rotation speed. The structure is complicated due to the presence of Furthermore, in order to synchronize and smoothly interlock these two cam levers and the accelerator cam, it is necessary to mold a precise cam mechanism, which makes workability and assembly difficult.

Further, in an operating device that electrically controls rotational operation in one-dimensional direction, there is a problem in that due to some electrical trouble, when an operator operates the controller, the controller may malfunction or not operate. In this case, it is necessary for the operator to return the rotation of the drum to neutral, but this operation is troublesome or may result in the ready-mixed concrete being poured due to failure to take appropriate measures.

Therefore, the purpose of this invention is to have a simple structure, a small number of parts, good workability and ease of assembly, and to be able to control the tilting angle of the hydraulic pump and the engine speed by operating in the same direction. To provide an operating device for a concrete mixer truck that can arbitrarily control a drum even if there is trouble in the system and can be operated safely.

[Means for solving the problem] In order to achieve the above purpose, the configuration of the present invention is as follows.
A hydraulic pump 2 drives the drum forward or reverse via a hydraulic motor, the hydraulic pump is driven by the engine 1, and the rotational direction of the hydraulic pump, the tilt angle of the swash plate, and the rotation speed of the engine are controlled by the link mechanism 4. In the operating device for a concrete mixer truck, the center of a main link 8 is rotatably supported on a support stand 5 via a shaft 7, and an engine control engine consisting of two links 9 and 10 is mounted at the center of the main link. Also, one end of the link 11 is rotatably supported, and the other end of the bifurcated link is connected to the engine side via intermediate links 9a, 10a and an accelerator operation link 29, and first bosses are provided on both sides of the main link. 17 and 2nd
The boss 18 of the forked link is connected to each link 9, 10 of
An arm 31 is provided below the main link, one end of which is rotatably supported below the shaft, and a receiving portion 32 that opens upward is provided at the end of the arm. A main link is removably fitted into the receiving part, and a driving link 13 is connected to the arm, and a link 16 for controlling the hydraulic pump is connected to one end of the main link via the second boss. , the hydraulic pump control link is connected to the cam member 15 and the L connected to the cam member.
It has type links 20 and 21, and a link 22 for controlling the tilting angle of the hydraulic pump connected to the L type link, and the cam member is connected to a groove 23 in which the second boss is rotatably fitted, and from this groove. Two tapered surfaces 2 that expand in diameter
4.

[Function] When the main link is rotated in one direction via the drive link, the first boss or the second boss pushes in the forked link for engine control, displacing the engine from the idling position to the high speed position, and At the same time, the hydraulic pump control link is displaced to control the tilt angle of the hydraulic pump in the rotational direction. Furthermore, by removing the main link from the receiving part and operating it, the hydraulic pump and engine can be controlled regardless of electrical system problems.

[Example] As shown in Figure 1, the concrete mixer truck is
It has a hydraulic pump 2 or a hydraulic servo that controls the rotational direction and rotational speed of the engine 1 and the drum, and a command signal from a controller 40 provided in the driver's seat holder 30 is sent to the engine via a servo motor 3 and a link mechanism 4. 1 and hydraulic pump 2.

The link mechanism 4 includes a main link 8 whose center is rotatably supported via a shaft 7 on a bracket 6 of a support base 5, and two main links whose center is rotatably supported via a shaft 7. A bifurcated link 11 for engine speed control consisting of links 9 and 10, a control rod 13 which is a drive link connected to the main link 8 side, and a control rod 1.
An arm 14 connects the other end of 3 to the output shaft of the servo motor 3, and a cam member 1 is connected to one end of the main link 8.
The hydraulic pump control link 16 is rotatably engaged with the hydraulic pump control link 16 via the hydraulic pump control link 5.

The main link 8 has first and second bosses 1 on both sides.
7 and 18 are provided, and the bosses 17 and 18 stand upward and face the links 9 and 10.

An arm 31 is provided below the main link 8. One end of the arm 31 is rotatably supported below the shaft 7. A receiving portion 32 that opens upward is provided at the end of the arm 31. The main link 8 is removably fitted into the main link 8.

One end of the control rod 13 is connected to the arm 31 via a bracket 33.
As shown in FIG. 5, the receiving part 32 is composed of a leaf spring 33 with a narrow opening formed by drawing the upper part inward, and the main link 8 is held within the leaf spring 33, but the spring force When the main link 8 is pushed upward against the force, the main link 8 is removed upward.

Further, the main link 8 is provided with a pair of support pieces 34 that open downward, and the arm 31 is fitted between the support pieces 34 . Therefore, the main link 8 and the arm 31 are stacked vertically, and the receiving part 3
The main link 8 and the arm 31 are connected via the support piece 34 and the main link 8, and when the main link 8 is pushed upward, the main link 8 and the arm 31 are separated.

When the two are connected, they move as one,
When the main link 8 is manually pulled up via the handle 35 at the end, the main link 8 is independently rotated.

When the output shaft of the servo motor 3 rotates, the rotational motion is transmitted to the main link 8 via the arm 14, control rod 13, and arm 31, and the main link 8 rotates clockwise or counterclockwise around the shaft 7. Rotate.

Each link 9, 10 of the forked link 11 is connected to an intermediate rod 9a, 10a, and
The other end of the arm 28 is pivotally connected to the head 28a of the arm 28, which is pivotally connected to the bracket 27 of the support base 5, and the lower part of the arm 28 is connected to the engine 1 via an accelerator operation link 29.

One of the links 9, 10 is pushed through the first boss 17 or the second boss 18, and the intermediate rods 9a,
When one of the arms 10a is pushed out, the arm 28 moves toward the shaft 3.
The engine 1 rotates counterclockwise in FIG. 1 using the fulcrum 9, and the accelerator operation link 29 is pulled, thereby displacing the engine 1 from the idling position a to the high speed position b.

The link 16 for controlling the hydraulic pump is the cam member 15
and an L-shaped link 20 connected to the cam member 15,
21, and a tilting angle control link 22 connected to the link 21. When the link 21 is displaced clockwise in FIG. 1, the link 22 is pulled, causing the hydraulic pump 2 to rotate forward and the drum When the drum is rotated to the input side and displaced counterclockwise, the link 22 is pushed, the hydraulic pump 2 is reversed, and the drum is rotated to the discharge side.

The cam member 15 has a plate body, a semicircular groove 23 provided at the end of the plate body, and two tapered surfaces 24 whose diameter expands outward from the groove 23. In the neutral position shown in FIG. The second boss 18 fits into the groove 23 and engages with it, and when the main link 8 rotates clockwise or counterclockwise, the second boss 18 gradually disengages from the groove 23 and is hooked on the tapered surface 24. It's becoming like that.

The embodiment shown in FIG. 1 is shown as an electrical control device that drives a link mechanism via a servo motor 3 in response to a command signal from a controller 40.

In any case, when the link mechanism of the present invention is used, the operating direction of the engine and the operating direction of the hydraulic pump are the same.

The operation of the link mechanism will be explained below based on FIGS. 2 to 4.

The state shown in FIG. 2 shows a neutral position in which the main link 8 is maintained in a horizontal state and the second boss 18 is fitted into the groove 23. At this time, the drum of the concrete mixer truck and the hydraulic pump 2 are in the neutral position X, and the engine 1 is in the idling position a.

That is, when the link 21 is in the X position, the swash plate tilt angle of the hydraulic pump is at the neutral position, and when the link 21 is displaced to the Y position, the hydraulic pump 2 is in the normal rotation side and the swash plate tilt angle is at the maximum. and link 2 at position Z
1 is displaced, the hydraulic pump 2 is on the reverse rotation side and its swash plate tilt angle is maximum.

When the arm 14 of the servo motor 3 shown in FIG. 1 is rotated clockwise, the control rod 13 is pushed and the main link 8 is rotated counterclockwise about the shaft 7 as shown in FIG. 4.

At this time, while the second boss 18 is fitted into the groove 23, the cam member 15 is pushed clockwise, the hydraulic pump control link 16 is rotated clockwise, the link 22 is pulled, and the drum is agitated. Controlled in the input direction.

When the link 21 reaches the maximum loading position Y, the second
The boss 18 is removed from the groove 23, and at this time, the first boss 18
The boss 17 contacts one link 9 of the forked link 11 and pushes it. When the link 9 of the forked link 11 is pushed, the intermediate link 9a is pushed, the entire forked link 11 is extended, and the engine 1 changes from the idling position a to the high speed position.

When the engine rotates at high speed, the first boss 17 pushes the bifurcated link 11 to the maximum, and at this time, the second boss 18 comes off the groove 23 and is only supported by the tapered surface 24, and the link 16 for controlling the hydraulic pump does not change and is held at the maximum input position Y.

Contrary to the above, when the control rod 13 is pulled counterclockwise, the main link 8 rotates clockwise, the hydraulic pump control link 16 is pushed counterclockwise, and the drum is set at the discharge position Z. Ru.

At this time, the second boss 18 pushes the other link 10 of the forked link 11, causing the engine 1 to rotate at high speed.

When the arm 14 of the servo motor 3 is returned to the neutral position, the main link 8 returns to the horizontal neutral position via the control rod 13, the engine 1 returns to the idling position a, and the hydraulic pump 2 returns to the neutral position
will be returned to.

As mentioned above, when the control rod 13 is moved in one direction via the servo motor 3 under electrical control, the hydraulic pump and drum are controlled in the stirring, feeding direction, or discharging direction depending on the operating direction. At the same time, engine speed control is performed.
Therefore, the control directions of the engine and the hydraulic pump are the same.

By the way, if the electrical system including the controller 40, servo motor 3, etc. that controls the control rod 13 breaks down or stops working, the following operations are performed manually.

When the main link 8 is pulled upward via the handle 35, the main link 8 resists the spring force of the plate 33 and floats upward from the receiving part 32 as shown by the dotted line, and at this time the support piece 34 separates from the arm 31. .

For this reason, the main link 8 is separated from the arm 31, control rod 13, and servo motor 3.
The main link 8 can be manually rotated clockwise or counterclockwise via the handle 35. The operation of the link mechanism in this case is the same as in the normal case. Therefore, if the electrical system fails, the drum can be controlled arbitrarily by manual operation.

[Effects of the invention] According to the invention, the number of engine rotations and the rotational direction and tilting angle of the hydraulic pump can be controlled simultaneously by using one link mechanism, which reduces the number of parts in the control mechanism and reduces the structure. is simple, and improves workability and assemblability.

Since the rotational speed control direction of the engine and the control direction of the hydraulic pump are the same, operation is easy and there is no possibility of operational errors. The link mechanism connected to the engine side does not have a cam member, resulting in a simple structure and improved workability.

Furthermore, if the electrical system breaks down or does not operate, the system can be switched to manual operation and the drum can be controlled, which is safe and prevents ready-mixed concrete from being discharged onto the ground.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an electric control device using the operating device of the present invention, FIG. 2 is a plan view of the operating device according to an embodiment of the present invention, FIG. 3 is a front view of FIG. 2, and FIG. The figure is a schematic plan view showing the operating state of the operating device of the present invention changed from the neutral position to the engine high speed position, and FIG. 5 is an enlarged side view of the receiving part. 1... Engine, 2... Hydraulic pump, 8... Main link, 9, 10... Link, 9a, 10a
...Intermediate link, 11...Forked link, 13...
Drive link, 16... Link for hydraulic pump control, 17, 18... Boss, 20, 21... L-type link, 22... Link for hydraulic pump tilting angle control, 23... Groove, 24... ... Tapered surface, 29 ... Link for accelerator operation, 32 ... Receiving portion.

Claims (1)

[Scope of utility model registration request] Hydraulic pump 2 drives the drum forward or reverse through a hydraulic motor, and the hydraulic pump drives engine 1.
In the operating device for a concrete mixer truck, in which the rotational direction of the hydraulic pump, the tilting angle of the swash plate, and the rotational speed of the engine are controlled by the link mechanism 4, the center of the main link 8 is connected to the support base 5 via the shaft 7. One end of a forked link 11 for engine control consisting of two links 9 and 10 is rotatably supported at the center of the main link, and the other end of the forked link is rotatably supported by an intermediate link 9a. , 10a and the engine side via an accelerator operation link 29, and a first boss 17 and a second boss 17 are connected to each other on both sides of the main link.
The boss 18 of the forked link is connected to each link 9, 10 of
An arm 31 is provided below the main link, one end of which is rotatably supported below the shaft, and a receiving portion 32 that opens upward is provided at the end of the arm. A main link is removably fitted into the receiving part, and a drive link 13 is connected to the arm, and a hydraulic pump control link 16 is connected to one end of the main link via the second boss. , the hydraulic pump control link is connected to the cam member 15 and the L connected to the cam member.
It has type links 20, 21 and a link 22 for controlling the tilting angle of the hydraulic pump connected to the L type link, and the cam member is connected to a groove 23 in which the second boss is rotatably fitted, and from this groove. Two tapered surfaces 2 that expand in diameter
4. An operating device for a concrete mixer vehicle, comprising: