JPS5913436Y2 - sliding member - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a sliding member in which a solid lubricant is embedded with one end surface exposed in the sliding surface.

In sliding parts where a solid lubricant such as graphite is embedded in a base metal with a portion exposed, the embedded solid lubricant is supplied little by little to the sliding surface, forming a solid lubricant film there. Because of this, it can be used for long periods of time without the need for a separate supply of lubricant, but its use has been limited to low speed, high load areas.

As the sliding speed increases, the ability to form a film on the sliding surface decreases, and if there are areas where the film is insufficiently formed, the self-repairing action of the fixed lubricant may be difficult to perform smoothly, resulting in poor lubrication performance. There is a problem in that the performance is impaired and satisfactory performance cannot be obtained.

This idea allows the sliding member embedded with solid lubricant to store and hold a lubricant that becomes liquid at room temperature or becomes liquid when heated, so that it can be automatically supplied to the sliding surface during sliding. This is a system that significantly improves the problems mentioned above.

That is, dead-end holes are provided in the sliding surface of the base material that overlap each other in the sliding direction, and fibers containing a lubricant that is at least the same weight as its own weight or more and is liquid at room temperature or becomes liquid when heated are placed in the holes. A solid lubricant is filled with an oil-absorbing agent made of natural, diatom-based, other organic and inorganic powder, or a mixture thereof, and a solid lubricant having holes through which the lubricant can pass is placed on the oil-absorbing agent, and one end surface of the solid lubricant is brought into contact with the oil-absorbing agent. , provides a sliding member characterized in that the other end surface is exposed and embedded in the sliding surface.

In this invention, sliding members include sliding plates, cams, rollers, gears, bearing bushes, sliding rods (rods, pins), etc. that slide relative to each other by supporting, guiding, or transmitting loads. Refers to parts.

The sliding member is mainly made of metal material, but may also be made of synthetic resin material or ceramic material depending on the case.

The oil absorbing agent is, for example, cellulose, diatom, or other organic/inorganic powder, or a mixture thereof, and is a material that absorbs and retains at least the same weight of lubricating oil as its own weight.

Oil-absorbing agents such as Permawick (trade name), which mainly consists of cellulose, and Oil Clean (trade name), which consists of inorganic powder and cellulose, can be used satisfactorily.

The solid lubricant used is one formed into a solid form of one or a mixture of two or more of graphite, molybdenum disulfide, tungsten disulfide, lead oxide, boron nitride, phthalocyanine (metal-free), and the like.

These solid lubricants are generally formed into a cylindrical shape, and small holes are provided through both end surfaces of the cylinder to serve as communication holes for the lubricant.

Materials such as graphite rod materials obtained through graphitization treatment after extrusion molding have considerable porosity, so that when processed to an appropriate thickness, lubricating oil can permeate through the materials.

Therefore, when such a material is cut into an appropriate size and used as a solid lubricant for pushing, it can be used as it is without particularly making small holes.

The lubricating agent that causes the oil absorbing agent to absorb and retain oil includes mineral oil, animal and vegetable oil, silicone oil, synthetic lubricating oil such as fluorinated oil, and grease with relatively low consistency.

Furthermore, for applications where the material is constantly used in a heated state, it is also possible to use products that are solid at room temperature, such as paraffin, fatty acid ester, and fatty acid amide, which become liquid at the temperature.

Hereinafter, description will be made based on embodiment figures.

1 is a base material constituting the sliding member, 2 is a solid lubricant, and 3 is an oil absorbent.

4 is a small hole provided through both end faces of the solid lubricant, which serves as an oil introduction hole when the lubricant 5 is soaked into the oil absorbent 3, and also supplies the absorbed lubricant to the sliding surface. It also serves as a supply hole for

The embodiment shown in FIG. 5 uses, for example, porous graphite as the solid lubricant that passes through the lubricant, and the solid lubricant 2 shown in this embodiment does not have small holes.

In order to obtain the sliding member of this invention, as shown in Fig. 1-A, embedded holes 6 are usually formed in the base material 1 so as to overlap each other in the sliding direction (in the direction of the arrow in the figure) so as to cover the entire sliding area. 20-40
%, fill the oil absorbing agent 3 into the hole 6, and then press-fit a solid lubricant into the solid lubricant, or apply adhesive to the outer peripheral surface of the solid lubricant except for both end surfaces and insert it. The solid lubricant is then pressed to compress the oil absorbent, and in this state, the solid lubricant is fixed in the hole of the base material.

Next, after finishing the sliding surface, the whole is immersed in a lubricant to impregnate the oil absorbent with the lubricant through the small pores 4 of the solid lubricant or the fine pores of the porous solid lubricant.

When using something like paraffin, which is solid at room temperature, as a lubricant, first melt and impregnate the oil absorbent with the paraffin, return to room temperature, and solidify the paraffin impregnated with the oil absorbent. 6 and then press-fit a solid lubricant to fix it in the hole 6.

The hole 6 drilled in the base material 1 is a cylindrical hole as shown in FIG. 2, but it may also be a hole with a step 7 or a slope 7' as shown in FIGS. 3 and 4. good.

In the example shown in FIG. 2, the hole 6 and the embedded solid lubricant 2 are both cylindrical, so the oil absorbent 3 needs to be compressed to a fairly high density in order to support the solid lubricant 2.

In the example shown in FIGS. 3 and 4, there are steps 7, 7', and the cylindrical solid lubricant 2 comes into contact with and is supported by the steps 7, 7'. Therefore, it is not necessary to compress the oil absorbent 3 tightly, and the work of embedding the solid lubricant is also easy.

In the example shown in FIG. 5, the permeability of the solid lubricant to the lubricating oil is utilized as described above, and the small holes 4 for introducing and supplying the lubricating oil are not provided.

In this embodiment, there is a disadvantage in the impregnation operation that it takes a long time to impregnate the oil absorbent 3 with the lubricant, but on the other hand, when used as a sliding member, no matter how it is used or installed, The feature is that there is no

FIG. 6 is a graph showing the results of the friction test.

In the figure, A is a sliding member according to this invention, and B and C are shown for comparison.

The table shows the test conditions.

Point P in the graph is the point after 1000 cycles (number of reciprocating sliding movements), and the lubricant on the sliding surface was wiped off at this point after the start of the test.

Test piece A according to this invention showed a constant friction coefficient after the start of the test, continued to show a stable friction coefficient from beginning to end even after the lubricant was wiped off from the sliding surface, and the test was discontinued after 5000 cycles.

After wiping off the lubricant on the sliding surface, Test B showed a stable coefficient of friction for about 1,000 cycles, but soon it began to generate frictional noise, more wear particles were generated, and the coefficient of friction increased rapidly.

C was dry friction caused only by graphite lubrication, and after the start of the test, friction noise was produced and the friction coefficient rapidly increased.

Deep wear marks appeared on the friction (sliding) surface of C, and formation of a solid lubricant film was hardly observed.

After B wiped off the lubricant applied to the sliding surface,
The reason why the friction behavior was almost stable for about 000 cycles was that the lubricant initially applied soaked into the solid lubricant (graphite) embedded in the sliding surface, and this caused an increase in the coefficient of friction for a certain period of time. and that the first 1oo
This is thought to be because the solid lubricant coating had progressed considerably on the sliding surface until the o-cycle sliding.

The reason why A was able to maintain a stable coefficient of friction throughout was because the solid lubricant film was well formed and the lubricant retained in the oil absorbent continued to be smoothly supplied to the friction sliding surface.

As explained above, the sliding member of this invention can be used even when the load is extremely large and the sliding speed is comparatively high. Due to the synergistic effect with the lubricant supplied to the sliding surface, the boundary friction characteristics of the sliding member are significantly improved.

Since its structure is as described above, its characteristics can be maintained for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the sliding member of this invention;
FIG. 1-A is a plan view thereof, FIGS. 2 to 5 are longitudinal cross-sectional views showing how the solid lubricant is embedded, and FIG. 6 is a graph showing the results of a friction test. 1: base material, 2: solid lubricant, 3: oil absorbent, 4: small hole, 5: lubricant, 6: hole.

Claims (1)

[Scope of utility model registration request] Dead-end holes are provided in the sliding surface of the base material that overlap each other in the sliding direction, and the holes are filled with a cellulose material containing a lubricating oil agent that is at least the same weight as the base material's own weight or more and is liquid at room temperature or becomes liquid when heated. , diatomaceous earth, other organic and inorganic powder, or a mixture thereof, and a solid lubricant having pores on the oil absorbent through which the lubricant can pass, one end surface of which is brought into contact with the oil absorbent, etc. A sliding member characterized by having an end surface exposed and embedded in a sliding surface.