JP3061076U - Oilless metal bush - Google Patents

Abstract

(57) [Problem] To provide an oilless metal bush capable of uniformly applying a lubricant to a rotating shaft while maintaining load resistance. SOLUTION: On the inner peripheral surface of a cylindrical metal bush body,
An oil-less metal bush in which a plurality of grooves extending almost the entire length in the generatrix direction are formed, and a solid lubricant is embedded in each of the grooves.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 TECHNICAL FIELD The present invention relates to an oil-less metal bush used as a pair around civil engineering construction machines such as power shovels and other various machines.

[0002]

[Prior art]

 Conventionally, for example, as an oil-less metal bush used for the arm connection part (around pair) of a power shovel, a large number of holes penetrating in and out of the peripheral wall of the cylindrical metal bush body are formed in a uniform distribution, and these through holes are 2. Description of the Related Art It is known that a paste-like lubricant obtained by mixing molybdenum disulfide powder with a resin is filled and cured. However, the conventional product described above has a drawback that the strength against the load in the true diameter direction is greatly reduced because a large number of through holes are formed in the metal bush body.

In order to improve this, instead of the through holes, a large number of spot-shaped depressions are formed in the inner peripheral surface of the metal bush with a uniform distribution, and these depressions are filled with a paste-like lubricant and cured. Something was suggested. However, even with this improvement, it is necessary to increase the number of spots or increase the number of spots in each lubricant in order to evenly apply the lubricant to the shaft circumference of the rotating shaft inserted in the bush. As a result, the entire peripheral wall of the bushing body is the same as that formed on thin ground, and it is not possible to expect much improvement in load resistance.

[0004]

[Problems to be solved by the invention]

 An object of the present invention is to provide an oil-less metal bush that can uniformly apply a lubricant to a rotating shaft while maintaining load resistance.

[0005]

[Means for achieving the object]

 Therefore, the present invention proposes an oil-less metal bush in which a plurality of grooves are formed on the inner peripheral surface of the cylindrical metal bushing body and extend substantially the entire length in the generatrix direction, and a solid lubricant is embedded in each of the grooves. I do.

As the “solid lubricant” in the present invention, a mixture of powders of molybdenum disulfide, graphite and the like with an appropriate synthetic resin binder is used. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0007]

【Example】

 In FIGS. 1 and 2, the metal bush body (1) is a cylindrical body made of cast iron or a copper alloy, and has six grooves (2) in the present example, which extend to almost the entire length in the generatrix direction. Each of the grooves (2) is filled with a lubricant paste obtained by mixing molybdenum disulfide powder with a synthetic resin binder in this example, and then hardened to bury a solid lubricant (3). I have.

When the rotary shaft is inserted through the oil-less metal bush of the above example and used, a solid lubricant (3) extending almost the entire length in the generatrix direction of the inner peripheral surface of the metal bush body (1) is attached to the rotary shaft. Since it contacts, the lubricant is applied evenly from the beginning to the outer peripheral surface of the rotating shaft in contact with the metal bush, and a sufficient lubricating action is performed.

In addition, since the lubricant is uniformly applied from the beginning, it is not necessary to increase the number of the solid lubricants (3). In FIG. 1 and FIG. 2, six are provided, but the number is further reduced. Therefore, the load resistance of the metal bush body can be improved as compared with the conventional product.

[0010]

[Effect of the invention]

 According to the oil-less metal bush of the present invention, the lubricant is uniformly applied to the peripheral surface of the rotating shaft inserted into the metal bush from the beginning, and sufficient lubrication can be performed. By reducing the number, the load carrying capacity of the metal bushing body can be improved compared to conventional products.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an oilless metal bush.

FIG. 2 is a sectional view taken along line II-II of FIG.

[Explanation of symbols]

 1 Metal bush body 2 Groove 3 Solid lubricant

Claims (1)

[Utility model registration claims] 1. An inner peripheral surface of a cylindrical metal bush body,
An oil-less metal bush in which a plurality of grooves extending almost the full length in the generatrix direction are formed, and a solid lubricant is embedded in each of the grooves.