JP2000314152A - Device for lubricating sluing wheel of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency in the work of mounting an elastic cove for sealing a grease bath. SOLUTION: This lubricating device is provided with both a grease bath GB to store lubricating oil for lubricating the gear parts 11a and 21a of a sluing wheel and an elastic cover 30 to cover a gap between a sluing center shaft member 1 and sluing body 2 to seal the grease bath GB. In this case, the elastic cover 30 comprises both a center engaging part 31 to be engaged with the sluing center shaft member 1 over its entire circumference and a circumferential edge engaging part 32 to be engaged with an engaging part 2A protruded from the sluing body 2 along the sluing center shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slewing ring lubrication system for lubricating a slewing ring of a construction machine, and more particularly to a slewing ring lubrication device having an elastic cover for sealing a grease bath for storing lubricating oil.

[0002]

2. Description of the Related Art FIG.
No. 72 (Japanese Utility Model Laid-Open No. 3-46553) shows a grease bath sealed portion of a slewing ring lubrication apparatus, which shows an example in which a gap between a center joint 1 and an upper revolving unit 2 leads to a grease bath. The center joint 1 moves the pressure oil between the upper revolving unit 2 and the lower traveling unit 3, and the center axis thereof is the turning center axis.

[0003] A rubber cover 4 is provided between the center joint 1 and the revolving unit 2 to cover the gap. The center portion of the rubber cover 4 is engaged with the peripheral surface of the center joint 1 over the entire circumference, and the edge portion is engaged with an engaging portion 2B protruding from the revolving unit 2. The engagement portion 2B is a turning center axis,
That is, it is provided so as to surround the center joint 1,
The upper end is a flange portion 2C projecting outward. Therefore, in order to engage the rubber cover 4 with the engaging portion 2B, the cover 4 must be extended outward and then engaged with the flange portion 2C in a direction perpendicular to the turning center axis. There was a problem of inefficiency.

[0004] It is an object of the present invention to provide a lubricating device for a rotating wheel of a construction machine in which the efficiency of attaching an elastic cover for sealing a grease bath is improved.

[0005]

FIG. 1 shows an embodiment of the present invention.
The present invention relates to a gear unit 1 for a turning wheel.
A swivel wheel of a construction machine having a grease bath GB for storing lubricating oil for lubricating 1a and 21a, and an elastic cover 30 covering a gap between the swivel center shaft member 1 and the revolving unit 2 to seal the grease bus GB. Applied to lubrication equipment. The elastic cover 30 includes a central engaging portion 31 that is engaged with the turning center shaft member 1 over the entire circumference, and an engaging portion 2A that protrudes from the revolving body 2.
And a peripheral engaging portion 32 engaged in the direction of the turning center axis, thereby solving the above problem.

[0006] 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 easier to understand. However, the present invention is not limited to this.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a turning wheel device according to the present embodiment, and the same components as those in FIG. 2 are denoted by the same reference numerals. The inner wheel 11 constituting the turning wheel is provided on the lower traveling body 3, and a gear 11 a is engraved on the inner peripheral surface over the entire circumference. On the other hand, the outer wheel 12 of the revolving wheel is provided on the upper revolving superstructure 2, and a plurality of balls 13 for smooth turning are interposed between the inner peripheral surface and the outer peripheral surface of the inner ring 11. A revolving drive device 21 is fixed to the revolving unit 2, and a gear 21 a provided on an output shaft of the revolving body 21 is a gear 11 a of the inner race 11.
Are engaged. Therefore, the gear 1
When 1a is rotated, the revolving superstructure 2 revolves with respect to the traveling body 3 around the center of the center joint 1 as a revolving center axis. A grease bath GB is formed between the revolving unit 2 and the traveling unit 3, and the gears 11a and 21 are driven by the lubricating oil stored therein.
The lubrication of the meshing portion a is achieved.

The center joint 1 comprises an outer joint 1A integrated with the traveling body 3 and an inner joint 1B integrated with the revolving unit 2 and rotating with respect to the outer joint 1A. The pressurized oil can flow back and forth between the traveling body 3 and the revolving superstructure 2. Since the gap between the inner joint 1B and the revolving unit 2 communicates with the grease bath GB, the gap is covered and sealed by the rubber cover (elastic cover) 30.

The rubber cover 30 has a hole-shaped central engaging portion 3 which is engaged with the outer peripheral surface of the center joint 1 over the entire circumference.
1 and a peripheral engaging portion 32 engaged with an engaging portion 2A protruding from the revolving structure 2. The peripheral edge engaging portion 32 is an annular ridge integrally formed so as to surround the entire outer periphery of the inner joint 1 </ b> B.
2a is formed. On the other hand, the engaging portion 2A of the revolving superstructure 2
Is an annular member provided so as to surround the entire outer periphery of the center joint 1 similarly to the engagement portion 32, and the upper end thereof is not provided with the conventional flange portion 2C (see FIG. 2). . Therefore, in order to mount the rubber cover 30, the peripheral edge engaging portion 32 is engaged with the engaging portion 2A in the direction of the pivot axis, and more specifically, the tip of the engaging portion 2A only needs to be fitted into the engaging recess 32a. It is not necessary to stretch the cover 30 outward.

In the above description, the engaging portion 2A on the revolving body side is engaged with the concave portion 32a provided on the peripheral edge engaging portion 32 of the rubber cover 30. Conversely, the concave portion is formed on the upper surface of the engaging portion on the revolving body side. It is also possible to provide an engaging portion (convex portion) on the rubber cover side here. The configuration of the turning drive mechanism is not limited to that shown in FIG.

[0011]

According to the present invention, since the peripheral edge engaging portion of the elastic cover is engaged with the engaging portion of the revolving body in the direction of the pivot center axis, the elastic cover is moved in the direction perpendicular to the pivot center axis. It is not necessary to extend the cover as in the case of engaging with the revolving body engaging portion, and the cover mounting work efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a turning wheel device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a part of a conventional turning wheel device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Center joint 2 Upper revolving body 2A engaging part 3 Lower traveling body 11 Inner ring 11a, 21a Gear 12 Outer ring 21 Revolving drive device 30 Rubber cover 31 Central engaging part 32 Peripheral edge engaging part 32a Engaging recess

Claims (1)

[Claims] 1. A construction machine comprising: a grease bath for storing lubricating oil for lubricating a gear portion of a slewing wheel; and an elastic cover for sealing a gap between the slewing center shaft member and the slewing body to seal the grease bus. In the revolving wheel lubricating device, the elastic cover is engaged with the revolving center shaft member in the revolving center axis direction with a central engaging portion engaged with the revolving center shaft member over the entire circumference and an engaging portion protrudingly provided on the revolving body. A lubricating device for a slewing ring of a construction machine, comprising: