JP3074786U - Sliding member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sliding member such as a guide shoe and a belt shoe excellent in durability and moldability while ensuring good lubrication for a long period of time. SOLUTION: It is made of plastic mixed with a small amount of lubricant, and has a large number of recesses formed on a sliding surface, and a paste-like lubricant is stored in these recesses. Be polyethylene.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a sliding member, and more particularly, to a lubricating structure of a sliding member that reduces the coefficient of friction between a movable member and a fixed member to smooth the movement of the movable member.

[0002]

[Prior art]

 Conventionally, a guide shoe 1 as a sliding member is attached to each of the upper and lower four corners of a car (box) A of an elevator, and the shoe 1 is slidable on a guide rail (slidable body) 2 respectively. (See FIG. 1), and a belt shoe 3 as a sliding member is arranged below the transfer-side rubber belt 4 on the belt conveyor, and the belt 4 is slid on the shoe 3. Sliding members are used for various purposes, such as being freely mounted (see Fig. 2). As a lubricating means for the sliding member, a plastic material such as monomer cast nylon is used for the sliding member, or in the case of the guide shoe 1, lubricating oil is applied between the shoe 1 and the guide rail 2. A lubricating device for supplying is provided, and in the case of the belt shoe 3, the shoe is formed from plastic mixed with a powdery or liquid lubricant to impart lubricity.

[0003]

[Problems to be solved by the invention]

 However, sufficient lubricity cannot be obtained simply by using a plastic material as it is as a sliding member, and lubricating oil cannot be supplied to the guide shoe 1 of the elevator, which has a long maintenance period, such as a home elevator. However, there is a problem in securing the lubrication, and it is practically difficult to adopt it. In addition, in the means for mixing the lubricant into the plastic as in the case of the belt shoe 3, when a large amount of the lubricant is mixed, the lubricant may cause a slip when feeding the resin, or the resin may flow too much. As a result, there is a molding problem such as difficulty in performing efficient molding such as injection molding because it causes burrs. In addition, if the amount of the lubricant is small, heat is generated when the friction coefficient at the time of sliding is large, as in the case of the rubber belt 4, so that durability is increased under severe use conditions such as a high pressure or a high conveying speed. Inferior use was not possible.

In view of the above circumstances, the present invention solves the above-mentioned problems, and secures good lubricating properties over a long period of time, and is excellent in durability and formability, and is a sliding member such as a guide shoe and a belt shoe. The purpose is to provide.

[0005]

[Means for Solving the Problems]

 The sliding member of the present invention is made of plastic mixed with a small amount of lubricant, and has a large number of recesses formed on the sliding surface, and the paste-like lubricant is stored in these recesses. Features. As a lubricant to be mixed into plastics, use powdered stearate, graphite, etc., liquid silicon oil, liquid paraffin, etc., paste molybdenum sulfide etc. singly or as a mixture. The reason for reducing the amount of mixing is to enable molding of the sliding member with high productivity by injection molding or the like. Further, the paste-like lubricant stored in the concave portion of the sliding surface is not particularly limited, but it is generally preferable to use grease.

As the plastic material, monomer-casting nylon, polyoxymethylene, polytetrafluoroethylene, ultrahigh-molecular-weight polyethylene, or the like can be used, but ultrahigh-molecular-weight polyethylene is preferably used. That is, ultra-high-molecular-weight polyethylene has excellent abrasion resistance, excellent chemical resistance to the grease, etc., a low coefficient of friction, and low harmful gas generation during combustion, and has excellent environmental properties. It is preferable to use the characteristics of the sliding member.

[0007]

[Embodiment of the invention]

 The embodiment of the present invention will be described with reference to the drawings. FIG. 3 illustrates a guide shoe 10 in which the elevator guide shoe 1 is improved, and FIG. 4 illustrates a belt shoe 20 in which the belt shoe 3 is improved. I do.

The guide shoe 10 is a molded product using a plastic such as ultra-high-molecular-weight polyethylene, monomer-casting nylon, polyoxymethylene, or polytetrafluoroethylene as a material. This is a block having a U-shape in plan view having side surfaces 12, 13, each of which is a sliding surface that comes into sliding contact with the guide rail 2. A small amount of a lubricant, specifically, a lubricant of less than 5 wt%, for example, silicone oil, liquid paraffin, or stearic acid lithium is mixed in the plastic in advance.

The groove bottom surface 11 and the side surfaces 12 and 13 are formed into an uneven surface having the entire surface evenly distributed, and paste-like grease 15 is stored and stored in each concave portion 14. The concave-convex surface of the groove bottom surface 11 exemplifies a case where the concave grooves constituting the concave portion 14 are arranged in an oblique lattice shape. For example, the size of the concave grooves, that is, the width, the depth, and the distance between the grooves are determined according to the application. Set as appropriate. The concave and convex surfaces of the side surfaces 12 and 13 show a case different from the groove bottom surface, in which concave grooves constituting the concave portion 14 are arranged in parallel at equal intervals, and the size of the concave grooves is also set appropriately, for example, the width. Is 1 mm, the depth is 2 mm, and the distance between the grooves is 3 mm. The grease 15 in the concave portion 14 is accommodated and stored in each concave portion 14 by applying paste-like grease to the groove bottom surface 11, the side surfaces 12 and 13.

The belt shoe 20 is a rectangular body made of a molded product made of plastic, similar to the guide shoe 10, and has a number of concave portions 21 formed on the surface with which the rubber belt 4 slides, and each of the concave portions 21 A paste-like grease 22 is stored and stored in 21. The concave portion 21 is exemplified by a hemispherical concave portion, but the radius (depth), the arrangement pitch in the upper, lower, left and right directions are arbitrary, and the shape of the concave portion 21 is also arbitrary. The grease 22 in the recess 21 is also stored by applying paste-like grease to the surface of the belt shoe 20 in the same manner as described above.

[0011]

【Example】

 As an example of the above-mentioned guide shoe and belt shoe, a test piece shown in FIG. 5 was manufactured to measure the dynamic friction coefficient. Example 1 The test piece 10a has the dimensions and shape shown in FIG. 5 (1), and its material is mixed with silicon oil (2 wt%), liquid paraffin (1 wt%), and stearic acid lithium (0.3 wt%). The concave groove 14a has a width of 1 mm, a depth of 1.5 mm, and a distance between the grooves of 3 mm. Paste grease was stored in the concave groove 14a. Example 2: The test piece 20a has the dimensions and shape shown in FIG. 5 (2), and is made of the same silicon oil (2 wt%), liquid paraffin (1 wt%), and stearic acid lithium as the test piece 10 a. (0.3 wt%), the concave portion 21a is a hemispherical dent having a radius of 2 mm, and the vertical, horizontal, and horizontal arrangement pitch is 5 mm. Paste grease was stored in the concave portion 21a.

Example 3 A monomer casting nylon is used in place of the ultrahigh molecular weight polyethylene shown in the test piece 10a (Example 1), and the rest is the same as Example 1. Example 4 A monomer casting nylon was used in place of the ultra-high-molecular-weight polyethylene shown in the test piece 21a (Example 2), and the other conditions were the same as in Example 2.

The test pieces of Examples 1 and 3 were used to measure the coefficient of kinetic friction when the sliding object was a metal such as the guide rail, specifically, steel (S45C). 4 and 4, the dynamic friction coefficient when the sliding object was rubber, specifically SBR, such as the rubber belt, was measured, and the measurement results are shown in Tables 1 to 4 together with comparative examples.

[0014]

[Table 1]

[0015]

[Table 2]

[0016]

[Table 3]

[0017]

[Table 4]

Thus, according to the above measurement results, the test pieces of Examples 1 to 4 were particularly superior to those of the comparative examples, particularly, when compared with those in which a lubricant was simply mixed and those in which irregularities were formed. It was confirmed that the coefficient of kinetic friction was improved and lubricity was improved. It was also confirmed that the improvement was higher when ultra-high molecular weight polyethylene was used as the material for the test piece than when other plastic materials were used. In the above-mentioned embodiment, the guide members for elevators and the belt shoes for belt conveyors have been described as sliding members. However, the sliding members are not necessarily limited thereto, and the sliding grooves may be concave or concave. The shape, size and arrangement are not limited to those described above.

[0019]

[Effect of the invention]

 According to the present invention, the amount of lubricant mixed into the plastic material is small, but the lubricating property of the sliding member is sufficiently ensured by the paste-type lubricant stored in the recess formed on the sliding surface. Thus, the dynamic friction coefficient can be reduced. Moreover, since the paste-like lubricant is stored in the concave portion, even when the sliding surface of the sliding member is worn, the sliding surface can be always kept in a lubricated state. Lubricity can be ensured for a long time.

[0020] Furthermore, since a small amount of the lubricant is mixed into the plastic material, there is no obstacle in efficiently forming the sliding member, so that the sliding member can be provided with high productivity at low cost. In addition to reducing heat generation under severe usage conditions, durability can be improved. Such an effect is particularly remarkable when ultrahigh molecular weight polyethylene is used as a material.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an elevator guide shoe exemplified as a sliding member.

FIG. 2 is a perspective view showing a belt shoe of a belt conveyor exemplified as another sliding member.

3 shows a guide shoe for an elevator according to the present invention, in which (1) is a partially cutaway perspective view, and (2) is an enlarged sectional view taken along line (2)-(2). FIG.

FIG. 4 shows the belt shoe of the present invention, wherein (1) is a perspective view and (2) is an enlarged sectional view taken along line (2)-(2).

5A and 5B show a test piece of an example, in which (1) is a perspective view of the test piece of Example 1 and (2) is a perspective view of the test piece of Example 2.

[Explanation of symbols]

10: Elevator guide shoe 14: Recess 15: Paste grease 20: Belt shoe 21: Recess 22: Paste grease

Claims (4)

[Utility model registration claims] 1. A sliding member made of plastic mixed with a small amount of a lubricant, having a large number of recesses formed on a sliding surface and storing a paste-like lubricant in the recesses. 2. The sliding member according to claim 1, wherein said plastic is ultra-high molecular weight polyethylene. 3. The sliding member according to claim 1, wherein the sliding object is a metal rail. 4. The sliding member according to claim 1, wherein the sliding object is a rubber belt.