JPH0542664Y2 - - 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 shovel truck 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.

[Problem to be solved by the invention] However, since the operating device of the above-mentioned concrete mixer vehicle is equipped with a cam lever for controlling the tilting angle of the hydraulic pump and an accelerator cam for controlling the engine speed, the structure is poor. It becomes complicated. 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.

Therefore, the purpose of this invention is to create a concrete mixer with a simple structure, a small number of parts, good workability and ease of assembly, and which can control the tilting angle of the hydraulic pump and the rotation speed of the engine by operating in the same direction. The purpose of the present invention is to provide a vehicle operating device.

[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 base 5, and two links 9 and 10 are attached to the center of the main link.
One end of a forked link 11 for engine control is rotatably supported, and the other end of the forked link is connected to the engine side via intermediate links 9a, 10a and an accelerator operation link 29, and is connected to the main link. A first boss 17 and a second boss 18 are erected on both sides of the forked link, facing each of the links 9 and 10, and a drive link 13 is provided on one end of the main link.
are connected to each other, and the second end is connected to the other end of the main link.
A link 16 for controlling the hydraulic pump is connected through the boss of the cam member 1.
5 and L-shaped links 20, 21 connected to the cam member
and a hydraulic pump tilting angle control link 22 connected to an L-shaped link, and the cam member has a groove 23 into which the second boss rotatably fits, and two grooves whose diameter increases from this groove. It is characterized by having a tapered surface 24.

[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.

[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 serving as a driving link pivotally connected to one end of the main link 8 via a shaft 12, and the other end of the control rod 13. an arm 14 that connects the servo motor 3 to the output shaft of the servo motor 3, and a main link 8
It has a link for controlling a hydraulic pump which is rotatably engaged with the other end via a cam member 15.

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.

The control rod 13 is connected to a position close to the first boss 17, and when the output shaft of the servo motor 3 rotates, the control rod 13 is connected to the main link 8 clockwise or counterclockwise via the arm 14, control rod 13, and arm 31. A clockwise rotational motion is transmitted, and the main link 8 rotates about the shaft 7 in a clockwise or counterclockwise direction.

Each link 9, 10 of the forked link 11 is connected to an intermediate rod 9a, 10a,
The other end of a is pivotally connected to a head 28a of an arm 28 which is pivotally connected to a 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. 3 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 the link mechanism via the servo motor 3 in response to a command signal from the controller 40, but the link mechanism is directly driven by an operating lever installed in the driver's seat. You can.

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. 4 to 6.

The state shown in FIG. 4 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 operating lever is moved in one direction or the arm 14 of the servo motor 3 shown in FIG. Rotate it.

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 input position Y, the fifth
As shown in the figure, the second boss 18 is removed from the groove 23, and at this time, the first boss 17 comes into contact with one link 9 of the forked link 11 and pushes it. When link 9 of forked link 11 is pressed, intermediate link 9
a is pressed, the entire bifurcated link 11 is extended, and the engine 1 changes from the idling position a to the high speed position.

As shown in FIG. 6, when the engine rotates at high speed, the first boss 17 pushes the forked link 11 to the maximum extent, and at this time, the second boss 18 comes off the groove 23 and is only supported by the tapered surface 24. The link 16 for controlling the hydraulic pump does not change and is held at the maximum closing 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 by electrical control, or when the control rod 13 is mechanically moved in one direction using the control lever on the driver's seat, the operation Hydraulic pump and drum stir depending on the direction.
It is controlled in the loading direction or the exhausting direction, and at the same time, the engine rotation speed is controlled. Therefore, the control directions of the engine and the hydraulic pump are the same.

[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.

[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. 5 and 6 are schematic plan views showing the operating state of the operating device of the present invention as it is changed from a neutral position to an engine high speed position. 1... Engine, 2... Hydraulic pump, 5... Support stand, 8... Main link, 9, 10... Link, 9a, 10a... Intermediate link, 11... Bifurcated link, 13... For driving Link, 16... Link for hydraulic pump control, 17, 18... Boss, 2
0, 21... L-shaped link, 22... Link for controlling the tilting angle of the hydraulic pump, 23... Groove, 24... Tapered surface, 29... Link for accelerator operation.

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, the rotational direction of the hydraulic pump, the angle of inclination of the swash plate, and the rotational speed of the engine are controlled by the link mechanism 4, in which the center of the main link 8 is rotatably supported on the support base 5. and two links 9, 1 in the center of the main link
0 is rotatably supported for engine control, and the other end of the forked link is connected to the engine side via intermediate links 9a, 10a and an accelerator operation link 29, and the main A first boss 17 and a second boss 18 are erected on both sides of the link, facing each of the links 9 and 10 of the forked link, and a driving link 1 is provided on one end of the main link.
3 are connected to each other, and a link 16 for controlling the hydraulic pump is connected to the other end of the main link via the second boss.
are connected, and the hydraulic pump control link is a cam member 15 and L-shaped links 20, 2 connected to the cam member.
1 and a hydraulic pump tilting angle control link 22 connected to an L-shaped link, the cam member has a groove 23 into which the second boss rotatably fits, and a second groove whose diameter expands from this groove. An operating device for a concrete mixer truck, characterized in that it has two tapered surfaces 24.