JP2000345583A - Blade device for construction equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid oiling failure by installing a grease nipple for oiling to the sliding section of a joint for supporting a blade in a rockable manner at a position not brought into contact with soil and sand on the side face of a joint section and preventing the fixing of soil and sand onto the nipple. SOLUTION: A blade is mounted on the traveling frame of a hydraulic backhoe, a bulldozer or the like through a universal joint section 22, and rocked by various kinds of cylinders. An oil filler (a grease port) 22f for lubricating the sliding sections 22b, 22c, 22d of the joint section 22 is set up on the side face of the joint section 22, and a grease nipple GN is fitted at an end section. The periphery of the grease nipple GN is surrounded by a cylindrical member 22F, and adhesion onto the nipple GN of soil and sand during operation is prevented. Accordingly, the oil filler 22f is not covered with soil and sand, and impossible oiling due to the adhesion of soil and sand can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade device provided in a construction machine such as a hydraulic shovel or the like, and more particularly to a blade device having a greasing passage for greasing a joint between a blade and a construction machine body.

[0002]

2. Description of the Related Art FIG. 4 is a side view showing an example of a hydraulic excavator. This hydraulic shovel has a lower traveling body 1 and an upper revolving superstructure 2 that can pivot with respect to the lower traveling body 1, and a blade device 10 is provided in front of the lower traveling body 1.
The blade device 10 has a blade (discharge plate) 11 supported on the lower traveling body 1 via a joint portion.
Is swingable in a horizontal plane and a vertical plane by a plurality of cylinders. The ground is leveled by moving the hydraulic shovel with the blade 11 set at a desired angle.

[0003] As a greasing mechanism of this kind of blade device,
For example, Japanese Unexamined Patent Application Publication No. 10-280472 and those shown in FIGS. 5 and 6 are known. The gazette of the above publication supplies grease to a connecting portion of a cylinder for driving a blade. FIGS. 5 and 6 provide grease to a joint portion between the blade 11 and the lower traveling body 1.

[0004] In FIGS. 5 and 6, a spherical shaft 13 is supported on the back surface of a blade 11 via a bracket 12.
A bearing 14 on the construction machine body side is slidably connected to the spherical portion 13a of the spherical shaft 13. The joint of the spherical shaft 13 and the bearing 14 allows the blade 21 to swing. The lubricating passage 1 for supplying lubricating oil to a contact portion between the spherical portion 13 a and the bearing 14 is provided in the spherical shaft 13.
3b is formed, and the greasing port 13c is opened in the upper surface of the shaft. A grease nipple GN is provided in the greasing port 13c.

[0005]

SUMMARY OF THE INVENTION As described above, the greasing port 1
In the configuration in which 3c is opened on the upper surface of the spherical shaft 13, the earth and sand may cover the grease nipple GN during the leveling work, and if left as it is, the earth and sand may adhere to the grease nipple GN, making it impossible to greasing.

[0006] An object of the present invention is to provide a blade device of a construction machine capable of avoiding the inability to supply oil due to the adhesion of earth and sand.

[0007]

FIG. 1 shows an embodiment of the present invention.
3, the present invention provides a lubrication system that supports a blade 21 in a construction machine body 1 via a joint portion 22 so as to be able to swing, and supplies lubricating oil to a sliding portion of the joint portion 22. The present invention is applied to a blade device of a construction machine in which a passage 22 e is provided in a joint portion 22. And the greasing port 22f of the greasing passage 22e
Is provided on the side surface of the joint portion 22, thereby solving the above-mentioned problem.

[0008] In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. It is not limited to.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is applied to the hydraulic excavator blade device shown in FIG. 4 will be described with reference to FIGS. FIG. 1 is a top view showing a blade device 20 according to the present embodiment. A C frame 23 is connected to a track frame 1A constituting the lower traveling body 1 of the hydraulic shovel so as to be rotatable up and down, and a central portion of a distal end of the C frame 23 is connected to a blade 2 via a universal joint 22 (FIG. 2).
1 is swingably connected to the back surface. Details of the joint portion 22 will be described later.

A pair of angle cylinders 24 is provided between the C frame 23 and the blades 21. The angle cylinders 24 are individually expanded and contracted so that the blades 21 are centered on the center joint 22 in the direction A in the drawing. (Performs an angle operation). A tilt cylinder 25 is provided between the tip of the C frame 23 and the back surface of the blade 21. Since the height of the connecting portions of the tilt cylinder 25 between the C frame 23 and the blade 21 is different from each other, The blade 21 performs a tilt operation around the joint 22. The tilt operation is a rotation operation along a vertical plane extending in the vehicle width direction. A lift cylinder 2 is provided between the track frame 1A and the C frame 23.
6 are provided, and the blade 21 moves up and down via the C frame 23 by the expansion and contraction.

The details of the joint portion 22 will be described with reference to FIGS. The joint portion 22 has a spherical shaft 22 supported on a lower portion of the back surface of the blade 21 via a bracket 22A as in the conventional case.
B and bearings 22C and 22D provided so as to sandwich the spherical surface 22b of the spherical shaft 22B. Bearing 22C is C
The bearing 22D is connected to the tip of the frame 23,
It is fixed to C with a bolt 22E. Double bearing 22C, 22D
When the concave spherical surfaces 22c and 22d slide on the spherical surface 22b, the blade 21 is allowed to swing, and the above-described angle operation and tilt operation can be performed.

The bearing 22C has a spherical surface 22 on one side thereof.
A greasing passage 22e is formed to reach a contact portion with the grease nipple GN at a greasing port 22f on the side surface. Lubrication is performed from the grease nipple GN to a sliding portion between the spherical surface 22b and the concave spherical surfaces 22c and 22d through a greasing passage 22e, thereby achieving lubrication.

As described above, in the present embodiment, the joint 2
Since the greasing port 22f for performing the lubrication of No. 2 is provided on the side face of the bearing 22C, the earth and sand do not adhere to and cover the grease nipple GN as in the case where the greasing port is provided on the upper face, and it is impossible to greasing. It will not be. In addition, as can be seen from FIG. 3, a cylindrical member 22F is attached to the side surface of the bearing 22C so as to surround the peripheral surface of the grip nipple GN, so that the adhesion of earth and sand to the grease nipple GN can be further suppressed.

In the above description, the lubrication passage 22 is connected to the bearing 22C.
e is provided on the bearing 22D side, and the bearing 22D
A greasing port 22f may be formed on the side surface of. Further, the present invention can be similarly applied to a blade device used for a construction machine other than a hydraulic shovel.

[0015]

According to the present invention, the greasing port for greasing the joint between the blade and the construction machine body is provided on the side surface of the joint, so that the greasing port is provided on the upper surface. The grease opening is not covered with earth and sand, and the inability to grease due to the adhesion of the earth and sand can be avoided.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a blade device according to the present invention.

FIG. 2 is a side view showing a connection state between a blade and a C frame.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2, showing a joint portion between the blade and the C frame and a greasing structure.

FIG. 4 is a side view of a construction machine (hydraulic shovel) provided with a blade device.

FIG. 5 is a side sectional view showing a conventional greasing structure.

FIG. 6 is a plan sectional view showing a conventional greasing structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 1A Track frame 20 Blade device 21 Blade (discharge plate) 22 Joint 22A Bracket 22B Spherical axis 22b Spherical surface 22C, 22D Bearing 22c, 22d Concave spherical surface 22e Greasing passage 22f Greasing port 23C frame 24 Angle cylinder 25 Tilt cylinder 26 Lift cylinder GN Grease nipple

Claims (1)

[Claims] A blade device for a construction machine, wherein a blade is swingably supported on a construction machine body via a joint portion, and a greasing passage for supplying lubricating oil to a sliding portion of the joint portion is provided in the joint portion. The blade device for a construction machine according to any one of claims 1 to 3, wherein a greasing port of the greasing passage is provided on a side surface of the joint portion.