JPH0437977Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is designed to prevent the boom from swinging upward while holding excavated earth, sand, stones, etc. in the bucket.
Stones in particular may spill and fall from the bucket, so to prevent the falling stones from hitting the boom cylinder and damaging the piston rod, the boom with the arm and bucket attached to the tip should be placed up and down on the aircraft. A hydraulic cylinder that is swingably mounted and drives and swings the boom is provided with its cylinder cylinder on the fuselage below the boom and a piston rod connected to the boom, and protection that protects the piston rod. attaching a cover to the piston rod via bolts, and
The present invention relates to a protective structure for a boom cylinder of a backhoe, which is supported so as to be movable relative to the cylinder cylinder in its longitudinal direction.

[Conventional technology]

Conventionally, in order to support the protective cover on the cylinder tube, as shown in FIG. 6, a support member 22 having a female thread 21 for screwing a bolt 20 is welded to the front circumference of the cylinder tube 10a. It has been considered to attach the protective cover 14 with bolts 20 screwed onto the support member 22.

[Problem that the invention attempts to solve]

However, since the bolt 20 and the support member 22 for screwing the bolt 20 largely protrude toward the front side of the cylinder tube 10a, the bucket belt tends to collide with the protective cover and the support member when the bucket belt is scraped into the arm. There was a risk that it would be difficult to bring the tip closer to the boom.

The purpose of the present invention is to enable the tip of the arm to be brought closer to the boom.

[Means for solving problems]

The characteristic structure of the protective structure for the boom cylinder of the backhoe in the present invention is that, in order to support the protective cover on the cylinder tube, a plate-shaped support member is welded to the front circumference of the cylinder tube, and both left and right ends of the support member are Attachment portions for slidably sandwiching the protective cover separately are formed on the left and right sides of the protective cover, or by the protective cover itself and the members attached thereto.The operation and effect are as follows. , as follows.

[Effect]

In other words, the plate-shaped support member is simply welded to the front circumference of the cylinder cylinder, and the protective cover is held in place by sandwiching the left and right sides of the support member between the protective cover itself or the protective cover and the attached members. Since the support member is formed to be supported by the support member, the support member moves relative to the protective cover while being in direct sliding contact, and causes the protective cover to protrude toward the front side of the cylinder by only the thickness of the support member.

[Effect of idea]

Therefore, the tip of the arm can be brought closer to the boom without touching the tip of the bucket against the protective cover. For example, when increasing the rising angle of the boom to turn the aircraft in a narrow space, the tip of the arm can be brought closer to the boom. As a result, the turning radius could be made smaller, and the performance of the backhoe could be improved while firmly protecting the piston rod over a long period of time against stones and other objects falling from the bucket.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 3, a crawler-type traveling machine base 1 is provided with a swivel base 2 that can fully rotate, and an engine section 3 and a control section 4 are provided on the swivel base 2.
A backhoe device 5 is attached to the machine base 1, and a dozer device 6 is attached to the machine base 1, respectively, to constitute a working vehicle capable of performing excavation work and soil removal work alternatively.

The backhoe device 5 is constructed by installing a swing bracket 8 on the swivel base 2, which can be driven and rotated around a vertical axis by a fluid pressure cylinder 7, and consisting of a boom 9a and an arm 9b, and two brackets, one for the boom and one for the arm. An arm device 9 that is movable and flexible around a horizontal axis by hydraulic cylinders 10 and 11.
A bucket belt 13 is attached to the tip of the arm 9b, which is connected to the bracket 8 and can be driven and rotated around a horizontal axis by a bucket fluid pressure cylinder 12.

The cylinder 10 is provided such that its cylinder tube 10a is connected to the swing bracket 8 below the boom 9a, and the piston rod 10b is connected to the boom 9a, so that when the arm device 9 is swung upward, the bucket 13 In order to protect the piston rod 10b from contents falling from the bucket, a metal protective cover 1 is provided to protect the piston rod 10b, as shown in FIGS. 1 and 2.
4 is attached to the piston rod 10b via a bolt 15, and a plate-shaped support member 16 is welded to the front circumference of the cylinder tube 10a, and both left and right ends of the support member 16 are slidably sandwiched separately.
are formed on both left and right sides of the protective cover 14, and the protective cover 14 is supported so as to be movable relative to the cylinder tube 10a in its longitudinal direction.

That is, the support member 16 is made of a single metal plate welded to the cylinder tube 10a, and the mounting portion A includes the protective cover 14 and the bolts 17 thereon.
The supporting member 16 is configured to relatively slide between the rail member 18 attached to the protective cover 14 along the longitudinal direction of the protective cover 14 and the protective cover 14. It is configured.

[Another example]

As shown in FIG. 4, the supporting member 16 may be made of two metal plates separated from each other and welded to the cylinder tube 10a. In this case, the protective cover 1
4 can be brought closer to the cylinder tube 10a.

As shown in FIG. 5, the mounting portion A may be formed by bending both side edges of the protective cover 14 so that the supporting member 16 is sandwiched between the protective cover 14 itself.

[Brief explanation of the drawing]

The drawings show an embodiment of the protective structure for the boom cylinder of a backhoe according to the present invention, in which FIG. 1 is a side view of the boom cylinder, FIG. 2 is a cross-sectional view taken along the - line in FIG. The overall side view, FIGS. 4 and 5 are respectively another embodiment of the cross-sectional view taken along the line - in FIG. 1, and FIG. 6 is a cross-sectional view of a main part showing a conventional example. 9a...Boom, 9b...Arm, 10...Fluid pressure cylinder, 10a...Cylinder tube, 10b...
...Piston rod, 13... Bucket, 14...
Protective cover, 15... Bolt, 16... Support member, 18... Member, A... Mounting part.

Claims (1)

[Scope of utility model registration request] A boom 9a with an arm 9b and a bucket 13 attached to its tip is attached to the fuselage so that it can swing up and down, and a hydraulic cylinder 10 drives and swings the boom 9a.
The cylinder tube 10a is provided in the body below the boom 9a, and the piston rod 10b is connected to the boom 9a, and a protective cover 14 is provided to protect the piston rod 10b.
This is a protective structure for a boom cylinder of a backhoe, which is attached to the piston rod 10b via a bolt 15 and supported so as to be movable relative to the cylinder tube 10a in the longitudinal direction. In order to support the cylinder tube 10a, a plate-shaped support member 16 is welded to the front circumferential portion of the cylinder tube 10a, and the mounting portion A includes both left and right end portions of the support member 16 that are slidably sandwiched therein.
A protective structure for a boom cylinder of a backhoe, which is formed on both left and right sides of the protective cover 14 by the protective cover 14 itself, or by the protective cover 14 and a member 18 attached thereto.