JPH0749672B2 - Upper body structure of turning work vehicle - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning work vehicle such as a backhoe, and more particularly to an upper body structure.

2. Description of the Related Art Generally, in a swing-type work vehicle of this type, an upper vehicle body is mounted on a lower vehicle body for traveling so as to be horizontally rotatable, and a slewing device such as a slewing motor mounted on the upper vehicle body is operated, The upper body is made to turn with respect to the lower body. Further, a work machine for excavation work, for example, is attached to the upper vehicle body.

However, the above-described turning device for turning is generally mounted on the bottom plate provided on the upper vehicle body frame that constitutes the upper vehicle body, and therefore the load of the turning device or the like acts on the bottom plate in a concentrated manner.

Conventionally, for example, as described in Japanese Utility Model Laid-Open No. 55-17866, a rectangular pipe-shaped reinforcement that is oriented along the longitudinal direction on the inside of a substantially rectangular main frame frame that constitutes the upper body frame. The frame member is attached, and the bottom plate attached to the lower surface of the main frame frame is attached to the reinforcing frame member, whereby the bottom plate and the main frame frame are reinforced. Further, in this structure, a work machine bracket material, which is separate from the main frame frame and the reinforcing frame material, is attached to the upper vehicle body frame, and the work machine is mounted on the work machine bracket material.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the one described in the above publication, since the working machine bracket material is separate from the main frame frame and the reinforcing frame material, not only the number of parts increases, There has been a problem that an additional welding process or the like for attaching the work machine bracket material to the upper vehicle body frame is required, resulting in an increase in manufacturing cost.

In view of such problems, the present invention has been made for the purpose of providing a turning work vehicle of this type at a lower cost.

Means for Solving the Problems In order to achieve the above object, according to the present invention, a working machine mounting frame member (15) integrally having a working machine mounting portion (21) on one end side thereof is oriented in the horizontal direction. A pair of support walls (18, 19) facing each other from the ceiling wall (17) are formed in a substantially inverted ship bottom shape that hangs downward, and this work machine mounting frame material (15)
The main body frame (16) having a substantially rectangular shape is attached to the upper body frame (5) so that the working machine mounting portion (21) projects outward, and the upper body frame (5) is configured. Support wall (1) for the work equipment mounting frame material (15)
8) (19) and a bottom plate (27) attached to the main frame frame (16) are provided.

In other words, since the working machine mounting portion (21) is formed integrally with the working machine mounting frame member (15), the number of parts is reduced. Moreover, since the bottom plates (27) are attached to the support walls (18) (19) and the main frame frame (16) that hang down below the work machine mounting frame member (15), no special reinforcing member is required.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, (1) is a running crawler (2).
Lower body (3) provided with (2) and its lower body (3)
2 shows a backhoe including an upper vehicle body (4) mounted on the upper part of the vehicle so as to be horizontally rotatable.

A work machine (9) including a boom (6), an arm (7) and a bucket (8) is mounted on the upper vehicle body (4) at the front end side of the upper vehicle body frame (5).
In addition, (10a) (10b) (10c) has shown the hydraulic cylinder for each driving the boom (6), the arm (7), and the bucket (8). Also, the upper body frame (5)
A seat (11) is installed approximately in the center of the front and rear of the vehicle, and a control box (12) also attached to the upper body frame (5) is installed between the seat (11) and the working machine (9). It is provided. An engine (14) covered with a hood (13) is mounted on the rear side of the upper body frame (5).

Next, a specific structure of the upper body frame (5) will be described. As shown in FIG. 1, the upper body frame (5) includes a work machine mounting frame member (15) according to the present invention,
It is basically configured by a main frame frame (16) having a substantially rectangular shape.

One work implement mounting frame material (15) is shown in Figs.
As shown in the figure, a flat ceiling wall (17) with a generally triangular shape whose lateral width becomes narrower toward the tip side, and a pair of supports with the opposite long sides of the ceiling wall (17) hanging downward. It is formed in a generally inverted ship bottom shape whose bottom is opened by the walls (18) and (19). The tip of the ceiling wall (17) has a semi-circular cutout (20) at the work implement mounting portion (2).
1) has been set.

The work machine mounting frame material (15) having such a shape is
At the center of the left and right of the main frame frame (16),
The main frame is arranged along the left and right horizontal frame parts (22a) and (22b) in the longitudinal direction, and the work machine mounting part (21) projects forward from the main frame frame (16). The front frame portions (23a) (23b) of the frame (16) are connected to the front and rear intermediate portions of the support walls (18) (19). A shaft support member (25) having a vertical shaft support hole (24) is fixed to the notch (20) and is provided at the lower end portion of the boom (6) of the working machine (9). The connecting member (26) is horizontally rotatably connected to the shaft supporting member (25).

The left and right support walls (18) and (20) of the work equipment mounting frame member (15) are, as shown in FIG. 5, lower surfaces of the horizontal frame portions (22a) and (22b) of the main frame frame (16). It is placed on the bottom plate (27) joined to the base plate and is integrally fixed to the bottom plate (27) by welding or the like. As shown in FIG. 1, the bottom plate (27) covers the lower surface of the main frame frame (16) at about 2/3 of the entire length from the front end to the middle.
In the vicinity of the rear end of the bottom plate (27), the main frame frame (1
The lower end of a partition wall (28) in the up-down direction that divides 6) into front and rear is fixed, and the rear end surface of the work machine mounting frame member (15) is welded to the front wall surface of the partition wall (28). An engine support plate (30a) is fixed to the rear end of the bottom plate (27) along the width direction of the main frame frame (16) so that the main frame frame is parallel to the engine support plate (30a). The engine (14) is supported by another engine support plate (30b) fixed to the rear side of the (16). In addition, (31a) (31b) (31c) is the engine (1
It shows a triple hydraulic pump driven by 4).

In addition, in this embodiment, the working machine mounting frame member (15) has the front side support wall (18) as shown in FIG.
Is oriented orthogonally to the partition wall (28), and the other support wall (19) facing the support wall (18) is divergent so as to intersect the partition wall (18) at an acute angle. It is oriented.

The bottom plate (27) located below the ceiling wall (17) of the work equipment mounting frame member (15) has a swing hydraulic motor (32) for swinging the upper vehicle body (4) with respect to the lower vehicle body (3). )
And a rotary joint (33) for supplying hydraulic oil to the lower vehicle body (3) are provided so as to face the inspection opening (34) having a large opening on the upper surface of the ceiling wall (17).
As shown in FIG. 6, the rotary joint (33) vertically penetrates the bottom plate (27), and a flange portion (33a) provided at an upper and lower intermediate portion thereof is fixed to the bottom plate (27). Further, below the bottom plate (27), a swivel bearing (38) is arranged at a position with the rotary joint (33) as an axis, and the swivel bearing (38) is arranged.
The outer ring (38a) is integrally fixed to the bottom plate (27). On the other hand, the inner ring (38
In b), an internal tooth portion (39) is formed on the inner peripheral surface thereof. The drive shaft (40) of the swing hydraulic motor (32) which penetrates the bottom plate (27) and projects downward is provided with a pinion (41) which meshes with the internal tooth portion (39). There is.

Further, a control valve (42) is arranged on one side of the work machine mounting frame member (15) and between the horizontal frame portion (22a) of the main frame frame (16). In addition, as shown in FIG. 3, a plurality of through holes (43) (43) are formed in the support wall (18) of the work implement mounting frame member (15) facing the control valve (42). It is set up. That is, the other end of the piping hose (44) (44) ... One end of which is connected to the control valve (42) passes through the through hole (43) (43). It is arranged between the material (15) and the bottom plate (27) and is connected to the turning hydraulic motor (32) and the rotary joint (33). The control valve (42) includes the control valve (42) and the triple hydraulic pump (31a) (31b) (31c).
The pressure oil is supplied through the piping hoses (45) (45) (45) interposed between and.

Also, the other support wall (1
A bracket (47) for pivotally supporting the bottom end of the boom swing cylinder (46) arranged along the support wall (19) is provided near the partition wall (28) in 9). It is designed to be installed in position. The support wall (19) has through holes (48) (4) as shown in FIG.
8) …… are formed, and these through holes (48) (4
A pipe hose for supplying hydraulic pressure to the boom swing cylinder (46) and the like is passed through 8) ....

That is, as in this embodiment, the support walls (18) and (19) of the work equipment mounting frame member (15) are provided with through holes (43) for piping.
By providing (48), there is an advantage that hydraulic piping can be easily performed.

Then, in this embodiment, as shown in FIG. 5, the floor boards (49a) (49b) fixed to the main frame frame (16) are directly attached to the ceiling wall (17) of the work machine attachment frame material (15). This eliminates the need for special mounting members for mounting the floor plates (49a) (49b), further reducing the number of parts, and eliminating the process for fixing such mounting members. It is possible to significantly reduce the cost.

Further, in this embodiment, the work machine mounting frame material (15)
Is formed in a generally inverted ship shape in which a pair of supporting walls (18) and (19) facing each other from the horizontally oriented ceiling wall (17) hang down, so that the ceiling wall (17) is part of the floor surface. Can be used to reduce the net area of the floorboards (49a) (49b). Moreover, the work implement mounting frame material (15) is composed of a pair of vertical support walls (18) provided upright on the bottom plate (27).
(19) and the supporting wall (18) (19) and the horizontal ceiling wall (17) that is continuous to form an integral structure that increases rigidity and does not require a special reinforcing member. Not only can the strength of the upper vehicle body frame (5) be enhanced, but the work machine mounting frame member (15) integrally formed with such a work machine mounting portion (21) is attached to the main frame frame (1).
Since the upper body frame (5) is constructed only by attaching 6), there is an advantage that the structure is simplified.

A hydraulic oil tank is installed on one of the floor plates (49b). Further, a link hole (51) from the control box (12) is provided in the ceiling wall (17) of the work machine mounting frame material (15).

As described above, in the present invention, the working machine frame member integrally having the working machine mounting portion on one end side thereof is configured such that the pair of support walls facing each other project downward from the ceiling wall oriented in the horizontal direction. The upper body frame is formed by forming a reverse ship bottom shape and attaching a roughly rectangular main frame frame to this working machine frame material so that the working machine mounting portion projects outward, thereby making Unlike the case where the bracket material for the working machine is attached to the upper body frame, not only the steps such as welding are unnecessary and the number of steps is reduced, but also the swinging device is supported by the bottom plate attached to the working machine mounting frame material. In this case, it is not necessary to provide a special reinforcing member for reinforcing the floor plate on the main frame frame, and there is an advantage that the number of parts is reduced and the manufacturing cost is reduced.

[Brief description of drawings]

FIG. 1 is a plan view of an upper vehicle body frame showing an embodiment of the present invention, FIG. 2 is an overall side view of a backhoe to which the present invention is applied, and FIG. 3 is a work machine mounting frame member according to the present invention. FIG. 4 is a plan view of the work machine mounting frame member, FIG. 5 is a view taken along the line AA of FIG. 4, and FIG. 6 is a partial cutaway view of FIG. It is a side view. (5) …… Upper body frame, (15) …… Work machine mounting frame material, (16) …… Main frame frame, (17) …… Ceiling wall, (18) (19) …… Supporting wall, (21 ) …… Work machine mounting part, (27) …… Bottom plate.

Claims (1)

[Claims] 1. A revolving work vehicle in which an upper vehicle body on which a working machine is mounted is rotatably attached to a lower vehicle body for traveling, and a working machine mounting frame member integrally having a working machine mounting portion at one end side thereof. Is formed into a substantially inverted ship bottom shape in which a pair of supporting walls facing each other from a horizontally oriented ceiling wall project downward.
An upper body frame is configured by attaching a roughly rectangular main frame frame to the work machine mounting frame material so that the work machine mounting portion projects outward, and the work machine mounting frame material is attached to the upper body frame. An upper body structure of a swing type working vehicle, characterized in that a bottom plate attached to the supporting wall of the vehicle and a main frame frame is provided.