JPS6226260Y2 - - 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.

In general, concrete mixer trucks extract power from the vehicle's engine, rotate the drum using a hydraulic pump/motor, and rotate the drum in the normal direction for pouring, kneading, and stirring the ready-mixed 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 in accordance 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) Drum rotational speed is controlled by a) changing the discharge volume of the hydraulic pump in the low-speed rotation range, and b) by increasing the engine rotational speed when high-speed rotation is required. It is carried out with

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 an operation in the left and right direction 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, operating the operating lever 1 or 2 requires operation in two dimensions, 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, by replacing the operation of the control lever with one-dimensional operation and by simplifying the structure.

For this reason, in the present invention, a sliding groove is provided, which has one end connected to a one-dimensional operating lever and which pivotally supports an intermediate link having a roller at the other end, and has one end connected to a hydraulic pump and the roller loosely fitted into the other end. A cam lever having an arcuate groove connected thereto is installed on the shaft, and an accelerator cam is integrally formed with the intermediate link, the accelerator cam having a cam edge consisting of an arcuate edge centered on the shaft support of the intermediate link and a pair of protruding edges; Furthermore, it is an object of the present invention to provide an operating device for a concrete mixer vehicle, characterized in that one end is equipped with a roller that comes into sliding contact with the cam edge, and the other end is equipped with an accelerator link that is connected to the accelerator of the engine. The gist of the present invention will be explained based on the embodiments shown below.

Figure 2 is a schematic diagram showing the configuration of the main parts of the device of the present invention, Figures 3 and 4 show the normal rotation of the hydraulic pump (normal rotation of the drum), and Figures 5 and 6 show the state of the hydraulic pump. 2A and 2B are schematic diagrams showing respective states of reverse rotation (reverse rotation of the drum).

In the drawings, 10 and 10' are the right rear one-dimensional operating lever and the left rear one-dimensional operating lever, and in Figures 3 and below, one one-dimensional operating lever 1 is shown.
0' is omitted. (Hereafter, the one-dimensional operating lever will be simply referred to as the operating lever).

These operating levers 10, 10' each have a shaft 10.
a, 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 around a shaft support 12a, and has a roller 13 at the other end, and the roller 13 can loosely fit into the sliding groove 13a of the cam lever 14 and face the arcuate groove 13b. As will be described later, the intermediate link 12 is connected to the pivot support 12.
When the roller 13 rotates about a and faces the arcuate groove 13b, the arcuate groove 13b is formed to draw an arc with a radius R centered on the shaft support 12a. 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 designates an accelerator cam that is integrally fixed to the intermediate link 12, and its arcuate edge 18a is formed to be equal to a circular arc of radius R centered on the shaft support 12a.
Projecting edges 18b are provided on both sides, and the intermediate link 12 operates together with the shaft support 12a.

Reference numeral 19 denotes an accelerator link, which is rotatably supported by a shaft 21, with a roller 20 at one end facing the cam edge (arculated edge 18a and protruding edge 18b) of the accelerator cam 18, and the other end is a rod link. It is connected to the accelerator 23a of the engine 23 via 22.

In the device of the present invention having the above configuration, the second
The figure shows a state in which the operating levers 10, 10' have been brought to the neutral position, the engine 23 maintains low speed rotation, the hydraulic pump 17 is stopped, and therefore the drum (not shown) is in a stopped state.

Next, as shown in the third figure, when the operating lever 10 is rotated by a certain angle in the counterclockwise direction in the figure, the rod link 11
Similarly, the intermediate link 12 is rotated counterclockwise about the shaft support 12a, and the roller 13 is moved to the opening of the sliding groove 13a.

Therefore, the cam lever 14 is rotated clockwise in the figure around the shaft 5, operating the operating lever 17a via the rod link 16, and the hydraulic pump 17 rotates in the forward direction, that is, the drum rotates in the closing direction.

At the same time, the accelerator cam 18 is rotated together with the intermediate link 12, but since the roller 20 is rotated along the arcuate edge 18a, the accelerator link 19 remains stationary, and therefore the engine 23 is rotated. It remains in a low speed state.

In this case, although FIG. 3 shows the maximum normal rotation position of the hydraulic pump 17, it goes without saying that the operating lever 10 can be operated at an intermediate position between the neutral position and the neutral position shown in FIG.

Next, when the operating lever 10 is further rotated counterclockwise from the pump positive rotation maximum position as shown in the fourth figure, the roller 13 is pushed up by the protruding edge 18b and rotates clockwise in the figure around the shaft 21. As a result, the accelerator 23a is activated via the rod link 22.
is operated, and the engine 23 is switched to high speed rotation.

At the same time, the roller 13 of the intermediate link 12
is transferred to the arcuate groove 13b of the cam lever 14, but since the arc of the arcuate groove 13b is equal to the arc of radius R' centered on the shaft support 12a, the cam lever 14 remains stationary. There is no change in the maximum forward rotation state of the hydraulic pump 17.

The above has described the forward rotation of the drum, but the fifth
The figure shows a case in which the operating lever 10 is rotated by a certain angle clockwise in the figure to reversely rotate the hydraulic pump 17 (drum discharge rotation). This results in a reverse rotation state, which shows the maximum reverse rotation position symmetrical to FIG. 3. However, by further rotating the operating lever 10 as shown in FIG. The edge 18b rotates the accelerator link 19 in the clockwise direction in the drawing about the shaft 21 via the roller 20, and the engine 23 is made to rotate at high speed, as in the case shown in the fourth drawing.

Incidentally, in the above-described embodiment of the present invention, the indoor operation lever for independently operating only the hydraulic pump 17 is omitted, but it goes without saying that it can be equipped in the same way as in the conventional case.

As described above, according to the device of the present invention, the hydraulic pump 17 and the engine 23 can be regulated only by operating the control lever 10 or 10' in one dimension, which makes the operation extremely easy and eliminates the need for the conventional device. Because the complicated link mechanism based on two-dimensional operation has been eliminated, and the configuration has been simplified, it is easy to maintain, has fewer failures, and has significant practical benefits such as improving durability.

It goes without saying 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 the drawing]

Figure 1 is a perspective view of the main parts of an example of a conventional concrete mixer vehicle operating device, Figure 2 is a schematic diagram showing the configuration of the main parts of an embodiment of the device of the present invention, and Figures 3 to 6 are It is a schematic diagram sequentially showing the operating states of the main parts. 10, 10'~operation lever, 10a, 10'a~
Axis, 11 ~ rod link, 12 ~ intermediate link, 1
2a~shaft support, 13~roller, 13a~sliding groove,
13b - arcuate groove, 14 - cam lever, 15 - shaft,
16 ~ Rod link, 17 ~ Hydraulic pump, 17a
~Operating lever, 18~Accelerator cam, 18a~
arcuate edge, 18b - protruding edge, 19 - accelerator link, 20 - roller, 21 - shaft, 22 - rod link, 23 - engine, 23a - 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 pivotally supported, 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 loosely fitted. While the cam lever is provided as a shaft, an accelerator cam is integrally formed with the intermediate link and has a cam edge consisting of an arcuate edge centered on the shaft support of the intermediate link and a pair of protruding edges, and is also in sliding contact with the cam edge. An operating device for a concrete mixer vehicle, characterized by having an accelerator link equipped with a roller at one end and connected to an engine accelerator at the other end.