JPH10140594A - Back hoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the traveling stability and the excavating stability, by connecting a boom-fitting base and a slewing frame through an offset arm which can swing the boom-fitting base to both right and left directions on a horizontal plane. SOLUTION: A slewing frame 3 is arranged to slew the frame 3 around the vertical axial center X through a slewing bearing 2 on a pair of right and left crawler-mounted traveling devices and a stealing drive device 4 is installed on the frame 3. And one end of the offset arm 15 of an offset structure 7 is pivotted around the vertical axial center through a shaft 15A, on a boom-fitting base 8, to make vertically movable the boom 9 of a back hoe. And the other end of the arm 15 is pivotted around the same axial center with the slewing center or the slewing frame 3 through the shaft 15B. On working, the driving body 16 is extended or contracted by hydraulic pressure to swing the offset arm 15 to the right or left side and swing the boom-fitting base and the back hoe. In this way, the traveling stability and the excavating stability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a backhoe,
More specifically, the present invention relates to a so-called small back turning backhoe excellent in narrow workability.

[0002]

2. Description of the Related Art A turning frame is disposed on a pair of left and right traveling devices via a turning bearing so as to be turnable around a vertical axis, and a steering operation device is provided on the turning frame, and turning in front of the steering operation device is provided. At the front end of the frame, there is provided a backhoe device comprising a boom capable of moving up and down, an arm connected to the tip of the boom so as to be able to bend, and a bucket mounted at the tip of the arm so as to enable a scraping operation and a dumping operation. The so-called small backward turning backhoe provided is provided on the market.

That is, as shown in FIG. 3, this backhoe is within the vehicle width of a pair of left and right crawler-type traveling devices C when the revolving frame B having the steering operation device A is fully turned (projects from the vehicle width). No), it is excellent in narrow workability, and the structure (building, shield, etc.) E by the backhoe device D
Gutter digging work could be done as close as possible.

[0004]

In the backhoe shown in FIG. 3, the operator's driving posture direction A-1 and the work traveling direction D-1 are almost 90 °, which is different from each other. There was a problem that the driving posture became very tired. Therefore, as shown in FIG. 4, between the boom D-2 and the arm D-3, which constitute the backhoe device D, an offset arm F and a telescopic arm as disclosed in, for example, Japanese Patent Application Laid-Open No. 1-271529. By providing the offset mechanism I including the cylinder G and the interlocking rod H, the driving posture direction A-1 and the work traveling direction D-1 are made to coincide with each other, so that the operator is less tired and the workability and steering stability are improved. Promising small back turning backhoes have been proposed.

However, in the backhoe shown in FIG. 4, the offset mechanism I includes the boom D-2 and the arm D
-3, there is a problem that the front weight (the weight of the entire backhoe device D) becomes heavy and running stability and excavation stability are somewhat lacking.
Also, when digging deeper than the length of the arm D-3, the boom D-2 hits the edge of the groove, and the groove depth is restricted. There was a problem that it became small. The present invention
An object of the present invention is to provide a backhoe that solves the above-mentioned problem by providing an offset mechanism at a base (base portion) of a boom.

[0006]

According to the present invention, a revolving frame 3 is disposed on a pair of right and left traveling devices 1 via a revolving bearing 2 so as to be revolvable about a vertical axis X, and is steered on the revolving frame 3. A driving device 4 is provided, and a boom 9 that can be moved up and down, an arm 10 that is connected to the tip of the boom 9 so as to be able to bend, and a tip of the arm 10 are provided at the front end of the turning frame 3 in front of the driving device 4 In order to achieve the above-mentioned object, the following technical measures are taken in the backhoe provided with the backhoe device 6 composed of the bucket 11 mounted so as to be capable of a scraping operation and a dumping operation.

That is, the present invention comprises a boom mounting table 8 for mounting the boom 9 movably up and down, and an offset arm 15 for connecting the turning frame 3 to the boom mounting table 8. The swinging operation can be performed in the left-right direction, and the driving body 16 that performs the swinging operation is provided. By adopting such a configuration, the digging operation direction and the driving posture direction match. The operator does not need to take an unreasonable posture, and since the offset mechanism 7 is mounted at the base of the boom 9, the front weight can be maintained as before, and running stability and excavation stability are ensured. It is possible, and the groove depth is not restricted by the boom 9.

Further, in the above configuration, according to the present invention, when the offset arm 15 swings, the interlocking body 17 for moving the boom mounting table 8 in parallel is provided in parallel with the offset arm 15. The boom 9, that is, the bucket 11 can be moved in parallel in the left-right direction to improve workability.
Is made coaxial with the vertical axis X, which is the pivot of the pivot frame 3, so that the swing operation of the backhoe device 6 and the pivot motion of the pivot frame 3 are less likely to interfere with each other.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall side view of a so-called small back turning type backhoe, and FIG.
The backhoe arranges a revolving frame 3 on a pair of left and right crawler-type traveling devices 1 via a revolving bearing 2 so as to be revolvable about a vertical axis X, and a seat 4A and a control unit 4B are arranged on the revolving frame 3. And a canopy 5 having a roof 5A located above the seat 4A. An offset mechanism 7 and a boom mount 8 are provided at the front end of the turning frame 3 in front of the steering operation device 4. A backhoe device 6 is provided.

The backhoe device 6 comprises a substantially dogleg-shaped boom 9 which is connected to a boom mounting table 8 so as to be vertically movable with a pin or a shaft 9A as a fulcrum, and a pin or a shaft 10A at the tip of the boom 9. An arm 10 operatively connected to a bend, and a pin or a shaft 11
A comprises a bucket 11 mounted on a fulcrum so as to be capable of a scraping operation and a dumping operation.
3. Each operation is enabled by the bucket cylinder 14.

One end of the offset mechanism 7 is pivotally mounted on the boom mounting base 8 around a longitudinal axis by a pin or a shaft 15A.
The other end includes an offset arm 15 pivotally connected to the center of rotation of the turning frame 3 by a pin or a shaft 15B as a coaxial center, and the offset arm 15 is swingable in a horizontal direction on a horizontal plane with the shaft 15B as a fulcrum. A space is formed in the front of the turning frame 3 to allow the arm 15 to swing.

A so-called parallel link is provided between the boom mounting table 8 and the offset arm 15, and a driving body 16 and an interlocking rod 17 which extend and contract by fluid pressure (hydraulic pressure) in parallel with the longitudinal direction of the arm 15. The offset arm 15 is swung in the left-right direction as shown by the arrow R in FIG. By adopting such a configuration, the maneuvering driving device 4 is set to the forward posture, and even when the left and right guttering work is performed by the backhoe device 6, the working direction and the driving posture match, and
By mounting the offset mechanism 7 on the lower surface side of the turning frame 3, it is possible to prevent the front weight from becoming excessive,
It ensures running stability and excavation stability.

Further, as shown in FIG. 2, the outer peripheral shape of the revolving frame 3 in plan view is a rear edge 3A having an arc shape having a radius centered on the vertical axis X and a rear edge 3A. A substantially U-shape is formed by left and right side edges 3B and 3C extending substantially linearly forward from both right and left ends of the portion 3A, and a front edge 3D connecting the left and right side edges 3B and 3C almost linearly. By adopting such a configuration, when the operator at the seat 4A has a view in the left and right front lower direction, when the left and right side edges are also circular in plan view as in the conventional example, the projections are Therefore, the line of sight was interrupted by the protruding portion, whereas the line of sight in the embodiment of the present invention had good visibility because there was no protruding portion. It is also possible to approach.

Further, left and right side edges 3B of the revolving frame 3 are provided.
3C does not protrude from the outer edges 1A of the pair of left and right traveling devices 1 in the forward posture, and the rear end 3A of the turning frame 3 is moved outside the pair of left and right traveling devices 1 when the turning frame 3 turns 90 degrees. By being formed so as not to protrude from the edge 1A, the operator does not need to perform a turning operation while paying attention to the rear part, and the workability is improved. It is possible to be closer and workability in narrow places is improved.

Further, the outer peripheral shape of the roof 5A in plan view includes a rear edge portion 5B having an arc shape, and right and left side edge portions 5 extending substantially linearly forward on both left and right sides of the rear edge portion 5B.
C and 5D form a substantially U-shape. With such a configuration, the visibility of the roof 5A of the canopy 5 is improved in the present invention with respect to the left and right upper visibility compared to the conventional visual line.

Further, as shown in FIG. 2, by making the side edges 3B and 3C of the revolving frame 3 substantially parallel to the side edge 1A of the traveling device 1, the revolving frame 3 is rotated about the axis X.
When the vehicle is turned, the side edge 1A and the side edges 3B and 3C are angled when viewed from the seat 4A. Therefore, it is possible to determine the amount of turning based on the magnitude of the angle, and the roof 5A
By making the side edges 5C and 5D tapered forward as shown in FIG. 2, the visibility in the upper left and right directions can be further improved.

The left and right side edges 3B of the revolving frame 3 are provided.
Steps SL, S at both sides of 3C and front edge 3D
By forming the R, getting on and off the steering operation device 4 is good, and the lower front part of the seat 4A is widened, so that the livability is good. In FIGS. 1 and 2, a support frame 19 extending in the left-right direction is mounted slightly in the middle in the front-rear direction of the revolving frame 3 and slightly behind.
The support columns 8 of the canopy 5 are provided upright on the left and right upper surface mounting portions 18B of the support frame 18.

A recess 18A is formed slightly to the left in the middle of the support frame 18 in the left-right direction, and a hood 20 for covering the engine 20A is provided. The seat 4A is mounted on the front recess 18A.
Is mounted, and a box 21 serving as a control unit 4B is provided in front of the box 21.
The box 21 has a pedal device 22 on the left side thereof. The control device 4 is located slightly to the left of the turning center, and a control panel portion 23 and a tank device 24 are provided on the right side. The weight balance is ensured. 1 and 2, reference numeral 25 denotes a handrail or a front guard, and reference numeral 26 denotes an undulating dozer device.

[0019]

As described in detail above, according to the present invention, the front weight does not become excessively large even when the backhoe apparatus can freely swing in the left-right direction, and running stability and excavation stability can be guaranteed. Narrow work can be performed by matching the working direction with the driving direction with less restriction on the depth.

[Brief description of the drawings]

FIG. 1 is an overall side view of a backhoe showing an embodiment of the present invention.

FIG. 2 is an overall plan view of the same.

FIG. 3 is a configuration diagram of a conventional example.

FIG. 4 is a configuration diagram of a second conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 traveling device 2 slewing bearing 3 slewing frame 4 steering operation device 6 backhoe device 7 offset mechanism 8 boom mounting base 15 offset arm

Claims (3)

[Claims] 1. A swing frame (3) is arranged on a pair of left and right traveling devices (1) via a swing bearing (2) so as to be able to swing around a vertical axis (X). A steering operation device (4) is provided at the front end of the turning frame (3) in front of the operation operation device (4), and a boom (9) that can move up and down and a bending operation can be performed at the tip of the boom (9). A backhoe comprising a backhoe device (6) comprising an arm (10) connected as a buckle and a bucket (11) attached to the tip of the arm (10) so as to be able to perform a scraping operation and a dumping operation, A boom mounting table (8) for vertically mounting the (9) and an offset arm (15) connected to the revolving frame (3), the offset arm (15) comprising:
The boom mounting base (8) is capable of swinging in the horizontal direction on a horizontal plane, and the driving body (16) performing the swinging operation
A backhoe comprising: 2. An interlocking body (17) for parallel movement of the boom mounting table (8) when swinging the offset arm (15) is provided in parallel with the offset arm (15). The backhoe according to claim 1, wherein 3. A vertical axis (X) in which a swing fulcrum of the offset arm (15) is a swing fulcrum of the swing frame (3).
And a coaxial core.
The backhoe described in.