JPH0270835A - Frame construction of swivel type constructional machinery - Google Patents

Abstract

PURPOSE:To prevent a wrong operation by installing an engine on the latter half section upon a swiveling upper body, providing a constructional machinery installation base to about central position of the top half section of the upper body and mounting a counterweight to the latter half section of the engine. CONSTITUTION:An operator's seat 3 is provided upon about a circular swiveling upper body 1, and a canopy 2 around the operator's seat 3. A constructional machinery installation base is provided to about the central position of the top half section of the upper body 1, and a main boom 8 is pivoted between bases. An engine room 5 is arranged to the latter half section of the upper body 1, and an engine (E) is supported at the inside thereof. A counterweight 20 capable of loading and unloading is provided to the latter half section of the engine (E).

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a frame structure of a small-swing construction machine such as a small-radius swing backhoe that enables digging ditches at construction sites such as narrow alleys. It is.

(b) Prior Art Techniques relating to frame structures in small swing type construction machines such as backhoes have been known for some time.

For example, it is disclosed in Japanese Utility Model Application Publication No. 55-131368.

(C) Problems to be Solved by the Invention The present invention solves the problem of the conventional small-swing type backhoe, in which the rotating upper body part is square, and when it rotates, the square-shaped rotating upper body requires a large turning radius, which ends up being narrow. Turning work was impossible in alleys and the like.

The present invention has modified this point and configured the portion of the swinging upper body to be approximately circular, so that even when the swinging upper body is turned, it does not interfere with the walls of the alley.

In this way, when the swing upper body is made approximately circular,
The counterweight is easily attached and detached from the swinging upper body, and the substantially circular state of the swinging upper body is not deformed by attaching and detaching the counterweight.

In addition, in such a roughly circular swinging upper body, the arrangement of the hydraulic oil tank, hydraulic pump, and hydraulic oil suction pipe that provides hydraulic pressure for driving the work equipment has been improved to minimize the length of the hydraulic oil suction pipe. The diameter of the pipe is reduced 1, and the structure is configured so as not to interfere with the work equipment mounting base, so that the shape of the swing upper body does not change from a substantially circular shape.

(d) Means for Solving the Problems The objects of the present invention are as described above. Next, the structure for achieving the objects will be explained.

An engine is mounted on the rear half of a substantially circular swinging upper body, a work equipment mounting base is formed approximately at the center of the front half of the swinging upper body, and a counterweight is formed at the rear of the engine. be.

In addition, the engine is mounted on the rear half of the approximately circular swivel upper body, and a work equipment mounting base is formed approximately in the center of the front half of the swivel upper body, and the work equipment is mounted on the front half of the swivel upper body. A hydraulic oil tank is mounted on one side of the work base, a hydraulic pump is placed on the engine side, and a hydraulic oil suction pipe from the hydraulic pump to the hydraulic oil tank is arranged to penetrate through the work equipment mounting base.

(E) Embodiment The object and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

The overall configuration will be explained with reference to FIGS. 1 and 2.

A crawler type traveling device 11 is wound around a trunk frame 10, and a temporary dozer 13 is disposed at the rear of the truck frame 10.

The dozer plate 13 can also be moved in front of the operator each time the swinging upper body 1 is turned.

A swivel bearing is interposed on the track frame IO,
A substantially circular swinging upper body 1 is arranged, and only the upper swinging upper body 1 can be rotated while the trunk frame 10 remains in the same position.

A driver's seat 3 is provided on the swinging upper body 1, and a canopy 2 is constructed around the driver's seat 3.

Work equipment mounting bases 22 and 23 are provided approximately at the center of the front half of the circular swinging upper body l, and the main boom 8 is pivotally supported between the work equipment mounting bases 22 and 23. .

Further, an offset boom 7 is pivotally supported at the upper end of the main boom 8 so as to be rotatable offset to the left and right, and furthermore, a packet boom 6 is pivotally supported at the tip of the offset boom 7.

Furthermore, the packet 4 is pivotally supported at the tip of the packet boom 6.

In addition, an engine room 5 is provided in the rear half of the approximately circular swinging upper body 1.
is arranged, and an engine E is supported inside.

Further, a hydraulic oil tank 9 is arranged in the front half of the right side of the work machine mounting bases 22 and 23.

According to the present invention, a counterweight 20 can be attached to be inserted into the engine room 5 in the rear half of the substantially circular swinging upper body 1.

Next, the explanation will be given with reference to FIGS. 3, 4, 5, 6, and 12.

The engine E is placed in the rear half of the approximately circular swinging upper body 1, with the rear part placed on the engine mounting base 18 via anti-vibration mounting brackets 18a and 18b and anti-vibration rubber. The swing mounting brackets 21a and 14a are arranged on the engine mounting stands 21 and 24, respectively.

The engine mounting base 21 is configured in an inverted U-shape, and the hydraulic oil suction pipe 12 is passed through the lower interior of the engine mounting base 21.

Further, the hydraulic oil suction pipe 12 is welded and fixed to the rear end of the working machine mounting base 23.

Further, as shown in FIG. 3, the hydraulic oil suction pipe 12 passes through the through hole 22c of the working machine mounting base 22.

The hydraulic oil suction pipe 12 carries the hydraulic oil in the hydraulic oil tank 9.
Suction into hydraulic pump P attached to engine E.

It constitutes an oil passage for entering the pipe, and it is necessary to arrange it at the shortest distance and make the pipe diameter as thin as possible.

The pressure oil discharged from the hydraulic pump P is sent to the hydraulic valve device A, and after being controlled by the hydraulic valve device A, the pressure oil is sent to each boom via a hydraulic piping bundle B divided into two directions. Oil is supplied to the left and right hydraulic motors of the cylinder and crawler type traveling device 11 via a swivel joint 17.

The return oil that has returned from each boom cylinder 8a, etc. and the swivel joint 17 is returned to the hydraulic oil tank 9 through a return oil pipe 14.

Since the return oil pipe 14 sends return oil after operation, there is no problem even if air gets mixed in, but the hydraulic oil suction pipe 12 that sucks the hydraulic oil from the hydraulic oil tank 9 into the hydraulic pump P, In order to prevent air from getting mixed in and to reduce the suction resistance, it is desirable to configure the structure with the shortest distance.

However, in the past, as in the prior art shown in FIG. 18, the hydraulic oil suction pipe 12'' was provided in a detour from the hydraulic oil tank 9 to the hydraulic valve device, or the hydraulic oil suction pipe 12'' was provided in a detour as shown in FIG. Thus, in order to provide the hydraulic oil suction pipe 12'', the swinging upper body 1'' had a long rectangular length from front to back so that the working machine attachment base and the hydraulic oil suction pipe 12'' did not overlap.

In the present invention, as shown in FIG. 10, the work equipment mounting bases 22 and 23 are provided at the center of a substantially circular shape, the hydraulic oil suction pipe 12 is also arranged to pass through the center of the circle, and both are arranged in an overlapping manner. As possible, through-holes 22c are formed in the work equipment mounting bases 22 and 23, and an insertion opening 1a is opened in the side of the swing upper body l as shown in FIG. A suction tube 12 can be inserted into the tube.

The insertion opening 1a of the swing upper body 1 is normally closed by a lid 19.

In addition, since the hydraulic oil suction pipe 12 also overlaps with the engine E, the engine mounting base 21 is configured in an inverted U-shape so that it can pass under the engine mounting base 21 of the engine E, and the hydraulic oil suction pipe 12 is configured to have an inverted U-shape. A tube 12 is passed through it.

Further, as shown in FIG. 8, the engine mounting base 18 that supports the engine E also serves as a counterweight, and is further equipped with another removable counterweight 20.
can be inserted and removed through the weight insertion hole 1b opened in the swing upper body l.

That is, the counterweight 20 is composed of a mounting bracket 20a and a weight bracket 20b, and is fixed to the swing upper body l at the mounting bracket 20a.

The weight bracket 20b is shaped so as not to interfere with the engine E in the inserted state.

(f) Other embodiments In addition, in a small swing type backhoe, hydraulic valve equipment WA
Hydraulic piping bundle B from to boom cylinder 8a, etc.
As shown in FIGS. 22 and 23, the work equipment mounting base 22
When the pipe passage hole 22a provided in the pipe is arranged to pass through,
The upper packet 4 passes through the pipe passage hole 22a.
The spilled dirt enters the hydraulic valve device A and convects in this area, gradually reducing the bending allowance of the hydraulic piping bundle B and eventually damaging the hydraulic piping bundle B. .

In this configuration, a plugging material 2 is provided in the pipe passage hole 22a through which the hydraulic pipe bundle B passes, as shown in FIGS. 20 and 21.
9, and further wrap the band 28 from above,
This prevents the hydraulic piping bundle B from coming apart.

Further, as shown in Fig. 24, the hydraulic piping bundle B from the hydraulic pulp equipment HA to the boom cylinder 8a... and the hydraulic piping bundle B leading to the swivel joint 17 are divided after passing through the pipe passage hole 22a, and the hydraulic piping bundle B is connected to the swivel joint. In the configuration leading to point 17, the sediment prevention plate 27 was placed above the pipe passage hole 22a, so there was a problem that the sediment spilled from the packet 4 would accumulate on the swivel joint 17. .

In this configuration, two sediment prevention plates 30 and 31 are provided, and the sediment prevention plate 30 prevents sediment from falling onto the hydraulic pipe bundle B and reaching the hydraulic valve device A from the pipe passage hole 22a. Furthermore, the earth and sand prevention plate 31 is configured to prevent earth and sand from falling onto the hydraulic pipe bundle B leading to the swivel joint 17.

In addition, in the case of the configuration shown in FIG. 25, the hydraulic piping from the hydraulic valve device A to the swivel joint 17 does not pass through the pipe passage hole 22a, but instead passes from the swing hydraulic motor 15 to the top of the swing mission case 16. Machine mounting base 2
The swivel joint 17 passes through the notch 22b of No.2.
It is structured in such a way that it reaches this point.

With this configuration, the pipe passage hole 22a and the notch 22 are protected by the earth and sand prevention plates 30 and 31 provided above and below.
It is possible to reinforce the work equipment mounting base 22 with opening b, and to prevent dirt from accumulating on the hydraulic valve device A and the swivel joint 17.

Further, as shown in FIG. 13, the engine room 5 that houses the engine E is also formed into a substantially circular shape, and an opening is provided at the rear to facilitate inspection and repair of the engine E inside. It is closed by a substantially circular opening M25.

A tool box 25a is attached inside the inspection g25.

Moreover, the battery stand 33 on which the battery 34 is placed is arranged inside the upper surface opening m5a, making it easy to take out the battery 34 for charging.

In addition, an inspection M5b is also provided to facilitate inspection and repair of the connecting portion between the hydraulic oil tank 9 and the hydraulic oil suction pipe 12.

(G) Effects of the Invention Since the present invention is configured as described above, it has the following effects.

As claimed in claim 11, an engine is mounted on the rear half of a substantially circular swinging upper body 1, a base for attaching a work implement is formed at a substantially central position of the front half of the swinging upper body, and the rear part of the engine is Since the counterweight was formed in Fig. 14, Fig. 1
As in the conventional technology shown in Fig. 6, since there is no protruding part in the swinging upper body 1, the operator can drive with confidence because there is no erroneous operation such as contacting an obstacle when the operator turns, thinking that there will be no interference during rotation. It can be done.

However, when the swinging upper body 1 is formed into a substantially circular shape, a large dead space is created between the engine E and the protrusion of the swinging upper body 1, but in the present invention, the engine mounting base 18 is installed in this area. Since it was possible to attach the counterweight 20 which doubles as a weight and which is detachable, it is possible to attach a counterweight of sufficient weight even though the swinging upper body l is approximately circular.

In the case of a conventional rectangular swinging upper body, adding a counterweight to the rear part would further increase the turning radius, but the present invention has been able to improve this problem. be.

Further, since the counterweight is usually made of a cast metal, the manufacturing cost remains the same even if it has an arcuate shape.

Furthermore, as claimed in claim (2), a hydraulic oil tank is mounted on one side of the work equipment mounting base in the front half of the swinging upper body, a hydraulic pump is arranged on the engine side, and the hydraulic oil tank is connected to the hydraulic oil tank by disposing a hydraulic pump on the engine side. Since the hydraulic oil suction pipe is placed through the work equipment mounting base, it can be easily connected to the work equipment mounting bases 22 and 23 and the engine E.
It can be arranged overlappingly with the hydraulic oil suction pipe 12, and there is no need to avoid the hydraulic oil suction pipe and arrange the work equipment mounting base and the engine as in the conventional case. It was possible to arrange the following.

Furthermore, by configuring the hydraulic oil suction pipe 12 without a detour, it can be constructed from a single pipe, which allows the diameter of the hydraulic oil suction pipe 12 to be made thinner, while still reducing suction resistance. It no longer increases.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of the small swing type backhoe of the present invention, Fig. 2 is the same (side view), and Fig. 3 is a hydraulic oil tank 9 on the swing upper body 1, a hydraulic pump P, a hydraulic valve device Δ, etc. FIG. 4 is a plan view showing the arrangement of the engine E on the swinging upper body 1.
and a drawing showing the arrangement of the work equipment mounting bases 22 and 23, No. 5
The figure is a rear view showing the engine mounting base 18 and engine E section,
6 is a side view, FIG. 7 is an exploded perspective view of the swing upper body 1 and the trunk frame 10, and FIG. 8 is a perspective view showing the configuration for attaching and detaching the counterweight 20 to the swing upper body 1. FIG. 9 is a perspective view showing the positional relationship between the swing hydraulic motor 15 and the swing transmission case 16 and the hydraulic piping bundle B of the hydraulic pulp apparatus A with respect to the swing upper body 1, and FIG. A perspective view showing a state in which the hydraulic oil suction pipe 12 is attached and removed, FIG. 11 is a perspective view of the portion where the hydraulic piping bundle B passes through the work equipment mounting base 22, and FIG.
A drawing showing the position of the anti-vibration mounting bracket) 18a...
FIG. 13 is a perspective view showing the engine room 5 and the inspection lid 25 attached and detached, FIG. 14 is a plan view showing the configuration of a conventional swing upper body 1°, and FIG. 15 is a shape of the swing upper body 1 of the present invention. FIG. 16 is a plan view showing the arrangement of a conventional hydraulic oil tank 9, and FIG. 17 is a plan view showing the arrangement of a conventional hydraulic oil tank 9.
18 and 19 are drawings showing the arrangement of conventional hydraulic oil suction pipes, and Figs. 20 and 21 are drawings showing the supporting state of the hydraulic piping bundle B of the present invention, Figure 22・
FIG. 23 is a drawing showing the supporting state of the conventional hydraulic piping bundle B;
24 and 25 are side views showing the protection portion of the hydraulic pipe bundle B. 1... Swinging upper body 5... Engine room 12... Hydraulic oil suction pipe ■8... Engine mounting base 20... Counterweight 21... Engine mounting base 22, 23... Work equipment Mounting base A...Hydraulic valve device B...Hydraulic piping bundle E...Engine P...Hydraulic pump Applicant: Yanmar Diesel Co., Ltd. ■ Figure 1 Figure Figure O method Figure 14 20' Figure 18 @ Figure 19 Figure 22FIA Figure 20 Figure 24 Figure 23 Figure 21

Claims (2)

[Claims] (1) An engine is mounted on the rear half of a substantially circular swinging upper body, a work equipment mounting base is formed approximately at the center of the front half of the swinging upper body, and a counterweight is installed at the rear of the engine. A frame structure of a swing-type construction machine characterized by the following: (2) The engine is mounted on the rear half of the approximately circular swivel upper body, the base for mounting the work equipment is formed approximately in the center of the front half of the swivel upper body, and work is carried out on the front half of the swivel upper body. The hydraulic oil tank is mounted on one side of the machine mounting base, the hydraulic pump is placed on the engine side, and the hydraulic oil suction pipe from the hydraulic pump to the hydraulic oil tank is placed through the work equipment mounting base. Features a frame structure for swivel construction machinery.