JPH03448Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is mainly used in construction machines such as box hoes in which the upper revolving body rotates 360 degrees with respect to the lower traveling body, and the present invention is a hydraulic operation that supplies hydraulic pressure to a working machine installed at the center of the front end of the upper revolving body. Regarding the arrangement structure of the valve.

Conventional Example FIGS. 1 and 2 show the entirety of this type of full-swivel type backhoe, in which an upper rotating body 3 is attached to a lower traveling body 2 equipped with a crawler traveling device 1 so as to be able to freely rotate 360 degrees. ing. The upper revolving body 3 is provided with a machine cab 5 that surrounds an engine etc. in the rear half of its frame 4.
A cockpit cabin 6 is provided at a position to the left of the center on the front side of the vehicle. A fulcrum bracket 8 is attached to the mounting base 7 at the center of the front end of the frame 4 of the upper revolving body 3 so as to be able to pivot in the left and right direction. An arm 11 is attached to the tip of the boom 10, and a bucket 12 is attached to the tip of the arm 11.
is installed. 13 is a boom cylinder installed between the fulcrum bracket 8 and the boom 10;
14 is a boom cylinder installed between the boom 10 and the arm 11; 15 is a link between the arm 11 and the bucket 1;
The bucketed cylinder installed between the two is shown.
In such a structure, each of the cylinders 13,
In order to supply pressure oil to 14 and 15, it is necessary to provide a hydraulic hose from a hydraulically operated valve housed in one location of the upper revolving structure 3 through the base end of the boom 10. Further, the hydraulically operated valve is operated by an operating lever (not shown) in the cockpit cabin 6, and therefore, this operating lever and the hydraulically operated valve are connected by a link.

In the hydraulic operating mechanism of such a vacuum cleaner, the following three types of arrangement structures for the hydraulic operating valves are used.

As shown in FIG. 3, a hydraulically operated valve 16 is placed on the side of the cockpit cabin 6 so as to be exposed to the outside. This structure has the disadvantage that the hydraulic operation valve 16 is exposed to the outside, which spoils the appearance, and that the number of links 17 is increased because the links are disposed across the cabin from the outside to the inside.

18 is piping.

As shown in FIG. 4, a hydraulically operated valve 16 is placed inside the machine cab 5 behind the cockpit cabin 6. In this structure, the hydraulic control valve 16 is far away from either the control lever at the front end of the cockpit cabin 6 or the work equipment 9, and the links 1
7 and piping 18 are both very long, and the inside of the machine cab 5 is narrow.

As shown in FIG. 5, a hydraulically operated valve 16 is placed horizontally below the floor of the cockpit cabin 6, with the connecting portion to the links 17 facing forward. Although this structure has a good appearance, the links 17 and hydraulic piping 18 for the work machine both extend forward, which has the disadvantage that they are complicated and maintenance is difficult.

Purpose of the invention The present invention eliminates the above-mentioned conventional drawbacks, eliminates the need for hydraulic piping and links to intertwine with each other, and connects these hydraulic piping and links to the operating lever of the work machine over the shortest possible distance. The object of the present invention is to provide a structure for arranging hydraulically operated valves.

Structure of the invention In order to achieve the above purpose, the invention has the following features:
Arrange the hydraulically operated valve so that the valve spool connecting end protrudes to the side opposite to the center, and place the operating lever links on the side of this connecting end, that is, on the opposite side of the center across the hydraulically operated valve. Hydraulic piping leading to the machine side is arranged together on the opposite side, that is, on the center side.

Embodiment Hereinafter, the configuration of the present invention will be explained in more detail based on the illustrated embodiment. As shown in FIGS. 6 and 7, in this embodiment, a hydraulic operation The valve 16 is vertically arranged so that the connecting ends of the valve spools 22, 22, . . . project toward the opposite side from the center of the upper rotating body frame 4. Such a hydraulically operated valve 16 is fixed to, for example, the upper revolving body frame 4 or the like. Links 17 connected to an operating lever (not shown) in the cockpit cabin 6 are arranged together in a space on the opposite side of the center of the upper rotating body frame 6 with the hydraulic operating valve 16 in between. and are each connected to the connection end of each valve spool 22. On the other hand, one end of hydraulic piping 18 for supplying pressure oil to the working machine 9 is connected to the upper surface of the hydraulic operation valve 16, and the other end is connected to the upper surface of the hydraulic operation valve 16.
The upper revolving body frame 4 extends toward the central part side and is arranged together, further extends forward in substantially parallel,
It is connected to the working machine 9 side. Further, in the center of the upper rotating body frame 6, there is a swivel yoit 2 for supplying pressure oil to the hydraulic motor of the lower traveling body 2.
3 is arranged, and this swivel gear 23
The hydraulic pipes 24, 24 connected to the hydraulic valve 16 directly extend toward the center from the hydraulically operated valve 16 portion and are connected thereto. Furthermore, a swing motor 25 for swinging the upper swing body 3 is disposed behind the swivel yoke 23, and a hydraulic pipe 26 from a hydraulically operated valve 16 corresponding to the swing motor 25 is connected to the
They extend toward the center and are connected.

Effects According to the configuration of the present invention as described above, the following effects can be obtained.

Since the hydraulically operated valve is disposed below the cabin floor, the hydraulically operated valve is not exposed to the outside, resulting in a good and clean appearance.

Links are placed on one side of the hydraulically operated valve, and hydraulic piping is placed on the other side, so these links and piping do not become intertwined, making assembly and maintenance easier and easier. It can save time.

The links are grouped on the opposite side from the center, and the hydraulic piping is grouped together in the center, so the links connected to the front of the cabin and the hydraulic piping that need to extend toward the center of the frame can be connected at the shortest possible distance. Can be tied. Therefore, the number of internal links is reduced and the hydraulic piping is shortened, which has the effect of reducing heat generation in the piping section.

[Brief explanation of the drawing]

Figure 1 is an overall side view of a full swing type backhoe;
Fig. 2 is a plan view, Figs. 3 to 5 are plan views of main parts showing the arrangement structure of a conventional hydraulically operated valve, and Fig. 6 is an enlarged view of main parts showing the arrangement structure of the hydraulically operated valve of the present invention. The plan view and FIG. 7 are exploded perspective views of essential parts showing the mounting structure of the cockpit cabin. 3... Upper revolving structure, 6... Cockpit cabin, 9
...Work equipment, 16...Hydraulic operation valve, 17...Number of links, 18...Piping, 21...Cabin floor.

Claims (1)

[Scope of utility model registration request] The work equipment is installed approximately in the center of the front end of the upper revolving structure,
Similarly, in a fully rotating construction machine where the cockpit cabin is located nearer to the left or right side of the upper revolving structure,
A hydraulically operated valve is disposed below the cabin floor with its valve spool connecting end protruding toward the opposite side from the center, and the operating lever links connected to the connecting end are connected to the hydraulically operated valve with the operating valve in between. An arrangement structure for hydraulically operated valves in construction machinery, characterized in that hydraulic piping leading to a working machine is arranged together at the center on the opposite side from the center.