JPH0351223Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an operating device for a concrete mixer truck.The purpose of the invention is to simplify the structure and improve operability, and to achieve low cost, improved functionality and durability. There is a wealth of equipment available for this kind of equipment.

Generally, in a concrete mixer truck, power is extracted from the vehicle's engine, the drum is rotated by a hydraulic pump/motor, and the drum is rotated in the normal direction for pouring, kneading, and agitating the fresh concrete during transportation. It is well known that fresh concrete is discharged by reversing the drum.

It is also well known that the rotational speed of the drum can be changed arbitrarily to obtain an appropriate discharge speed commensurate with the conditions at the kneading, stirring and discharge site to obtain the best ready-mixed concrete quality.

The rotation of these drums is controlled by operating a hydraulic pump and an engine. That is, (1) forward/reverse control of the drum is performed by changing the discharge direction of the hydraulic pump.

(2) The rotational speed of the drum is controlled by changing the discharge amount of the hydraulic pump in the low-speed rotation range, and by increasing the engine rotational speed when high-speed rotation is required. be exposed.

These hydraulic pumps and engines are operated remotely using a control lever installed at the rear of the vehicle, and the structure of a typical control device is shown in the perspective view of Figure 1. .

In FIG. 1, reference numerals 1 and 2 indicate a left rear operating lever and a right rear operating lever, respectively, both of which are connected to each other by a link mechanism 3, and when either one is operated, a hydraulic pump 4 and an engine 5 are operated. It is designed to do so.

For example, if we describe the operation pattern of this control lever for the left rear control lever 1, the control lever 1
is a left-right operation from its neutral position N, that is, L
In the R direction, the hydraulic pump is rotated in the normal direction (input), and the L position is at the maximum, and in the R direction, the hydraulic pump is reversed (discharged), and the R position is at the maximum.

Further, the engine 5 is configured to change speed in the vertical direction, that is, in the U direction.

That is, it has a two-dimensional operation pattern based on a U-shaped operation as shown by the arrow on the operation lever 1.

Such two-dimensional operation is performed using the link mechanism 3.
Separates hydraulic pump operation and engine operation,
The signals are transmitted via rod links 6 and 7, respectively.

Note that 8 is an in-vehicle operating lever for the hydraulic pump.

In short, in the conventional device, operation in a two-dimensional direction is required by operating the operating lever 1 or 2, which not only makes the operation more troublesome, but also
Link mechanisms such as cam links become complicated, which increases costs, requires labor for maintenance, and increases the number of failures.

The present invention is designed to eliminate the above-mentioned drawbacks of conventional devices of this type, and aims to simplify the structure by replacing the operation of the operating lever with one-dimensional operation.

For this reason, in the present invention, an intermediate link having one end connected to a one-dimensional operating lever and a roller at the other end is provided as a shaft, and one end is connected to a hydraulic pump, and the other end is provided with a sliding groove in which the roller is fitted. A cam lever having a continuous arcuate groove is installed on the shaft, an accelerator cam is connected to the rod link between the intermediate link and the one-dimensional operation lever, and a roller is provided at one end to slide against the trapezoidal cam edge of the accelerator cam. The purpose of the present invention is to provide an operating device for a concrete mixer truck, which is characterized by having a 2-shaped accelerator link attached to the shaft and connecting the other end of the link to the accelerator of the engine. The gist of the invention will be explained based on an example.

Fig. 2 is a schematic diagram showing the connection of the main parts of the device of the present invention, and Figs. 3 and 4 show the normal rotation state of the drum.
6 and 6 are schematic diagrams respectively showing the reverse rotation state of the drum.

In the drawings, reference numerals 10 and 10' indicate the right rear one-dimensional operating lever and the left rear one-dimensional operating lever, respectively, and from FIG. 3 onwards, one one-dimensional operating lever (hereinafter referred to as the operating lever) 10' has been omitted. The operating levers 10, 10' have shafts 10a and 10a, respectively.
10'a, and its lower end is connected to one end of an intermediate link 12 via a rod link 11.

The intermediate link 12 is rotatably supported by a shaft 12a, and has a roller 13 at the other end.
3 is adapted to fit into a sliding groove 13a of the cam lever 14 and to face an arcuate groove 13b which will be described later. Reference numeral 15 denotes a shaft supporting the cam lever 14, and the tip of the cam lever 14 is connected to an operating lever 17a of a hydraulic pump 17 via a rod link 16. Reference numeral 18 denotes an accelerator cam connected to the rod link 11, which has a trapezoidal cam edge 18a on one side and is opposed to a roller 20 at one end of the dogleg-shaped accelerator link 19.

This link 19 is supported at its center by a shaft 21, and the other end is connected to an axle 24 of an engine 23 via a rod link 22.

In the neutral position of the operating levers 10, 10' shown in the second figure, the engine 23 maintains low speed rotation and the drum is in a stopped state, but as shown in the third figure, the operating lever 10 is moved counterclockwise in the figure. , the intermediate link 12 is rotated counterclockwise in the figure through the rod link 11 about the shaft 12a, and the roller 13 is moved to the opening of the sliding groove 13a, so that the cam lever 14 is moved to the shaft 15. The actuating lever 17a is rotated clockwise as shown in the figure, centering on the lever 17a, and the actuating lever 17a is tilted to the right in the figure via the rod link 16.

In this way, the hydraulic pump 17 rotates in the normal direction, that is, rotates to insert the drum.

At the same time, the accelerator cam 18 is also operated integrally with the rod link 11, but since the roller 20 is in contact with the top horizontal edge of the cam edge 18a, the accelerator link 19 remains in the same state, and therefore the engine 23 maintains the low speed state.

In this case, although FIG. 3 shows the maximum normal rotation position of the imp, it goes without saying that the imp can be operated at an intermediate position between the neutral position and the neutral position shown in FIG.

Next, as shown in the fourth figure, when the operating lever 10 is further rotated counterclockwise from the pump forward rotation maximum position,
The roller 13 comes off the sliding groove 13a and faces the arcuate groove 13b having a cam surface with a radius R centered on the shaft 12a of the intermediate link 12. As a result, the intermediate link 1
Regardless of the movement of 2, the cam lever 14 does not operate,
Therefore, the hydraulic pump 17 maintains the normal rotation maximum position.

This is also the roller 2 of the accelerator link 19.
0 is pressed down by the inclined portion of the cam edge 18a, the accelerator 24 is pressed via the rod link 22, and the engine 23 is changed to high speed.

The foregoing has described the forward rotation of the drum. Next, FIG. 5 shows the drum reversal, that is, the drum discharge rotation state, when the operating lever 10 is rotated clockwise in the diagram. The cam lever 14 operates to reverse the hydraulic pump, and in this case, the engine 2 is at the maximum reverse position of the pump.
3 maintains the low speed rotation as in the case of FIG. 3, and when the operating lever 10 is further rotated,
The accelerator link 19 is rotated via the accelerator cam 18 as shown in FIG. 6, and the high speed of the engine 23 is maintained as in FIG. 4.

In the embodiment, the indoor operation lever for operating the hydraulic pump is omitted, but it goes without saying that it can be equipped in the same way as in the past.

As described above, according to the device of the present invention, the hydraulic pump 17 and the engine 23 can be regulated by only operating the operating levers 10 and 10' in one dimension. It has significant practical benefits, such as eliminating complicated link mechanisms based on two-dimensional operations and simplifying the configuration, making it easier to install, less likely to break down, and helping to improve durability.

Note that the aforementioned operating levers 10 and 10' can be replaced with electric motors, electromagnetic proportional valves, hydraulic cylinders, air cylinders, or other actuators.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main parts of an example of a conventional concrete mixer vehicle operating device, Fig. 2 is a schematic diagram showing the connection of main parts in an embodiment of the device of the present invention, and Figs. 3 to 6 are It is a schematic diagram sequentially showing the operating state of the main parts. 10, 10' - one-dimensional operation lever, 11 - rod link, 12 - intermediate link, 13 - roller, 1
3a - sliding groove, 13b - arcuate groove, 14 - cam lever, 15 - shaft, 16 - rod link, 17 - hydraulic pump, 17a - operating lever, 18 - accelerator cam, 18a - cam edge, 19 - accelerator link, 20 ~ roller, 21 ~ shaft, 22 ~ rod link, 23 ~ engine, 24 ~ accelerator.

Claims (1)

[Scope of utility model registration request] An intermediate link having one end connected to a one-dimensional operating lever and a roller at the other end is installed as a shaft, and one end is connected to a hydraulic pump, and the other end is connected to a sliding groove and an arcuate groove in which the roller is inserted. A dogleg-shaped accelerator link is provided, in which the cam lever is mounted on a shaft, an accelerator cam is connected to the rod link between the intermediate link and the one-dimensional operating lever, and the accelerator cam has a roller at one end that slides into sliding contact with the trapezoidal cam edge of the accelerator cam. An operating device for a concrete mixer vehicle, characterized in that the other end of the link is connected to an accelerator of an engine.