CN1166518A - Slidind material for light metal materials - Google Patents

Abstract

A sliding material for light metal materials contains polyether-ether ketone and/or polyether nitride. Further, 20-35wt% sericite is added to the sliding material as a solid lubricant to improve the wear resistance of the sliding material itself and the wear resistance of the matching parts with the sliding material.

Description

Sliding material for light metal materials

The invention relates to sliding materials for light metal materials.

In the automobile industry, sealing members are widely used to prevent leakage of oil supplied into oil passages. For example for automatic transmissions (known as AT). For the purpose of reducing the weight of the AT, most of the components used in the AT are exclusively manufactured from light metal materials such as aluminum-based alloys (eg ADC-12Z, Japanese Industrial Standard), so that the seal rings are made of counter or mating components made of light metal materials sliding contact. If the sealing ring is made of steel material, the wear of mating parts made of light metal material is abnormally increased. In contrast, if the seal ring is made of soft metal material, the surface of the seal ring will be extremely worn. In fact, it has been experienced that when a seal ring made of cast iron material is fitted into a ring groove on a rotating shaft made of ADC-12Z, oil leakage occurs at an oil pressure of 1MPa (about 10kgf/cm ² ). The amount is 500-1000cc/min.

In order to solve the problem of oil leakage described earlier in the combination of a seal ring made of cast iron material and a shaft made of ADC-12Z, a seal ring made of a synthetic resin with a large thermal expansion coefficient was developed. However, such a sealing ring has an adverse effect on a mating element made of an aluminum-based alloy that slides relative to the sealing ring, ie, the sliding surfaces of the mating element made of an aluminum-based alloy undergo extreme wear. In order to reduce wear or abrasion, a sealing ring made of polytetrafluoroethylene (called PTFE), a sealing ring made of polyether-ether ketone (called PEEK) with carbon fiber and PTFE as a filler, or a sealing ring made of PEEK , carbon fiber, PTFE and sericite powder material made of sealing ring (see Japanese Laid-Open Patent Publication (KOKAI) 262976/1993). When such a seal ring is used to prevent oil leakage between a seal ring in sliding contact and an opposing or mating element made of an aluminum-based alloy, the opposing or mating element is subject to significant wear, admittedly, Seal rings of the above compositions are of no use in applications where a counter or mating component of an aluminum based alloy specifically requires weight reduction.

For this reason, the main object of the present invention is to provide a sliding material for light metal materials that overcomes the above-mentioned disadvantages encountered in the prior art.

Another object of the present invention is to provide a sliding material which has good wear resistance and is suitable for suppressing sliding wear of a light metal material against the sliding material.

The object of the present invention can be achieved by providing a sliding material containing polyether-etherketone and/or polyether-nitride and sericite—with the addition of 20-35% by weight of sericite—which is in sliding contact with light metal materials and seal the oil applied between them.

A sealing ring is preferably made of the above-mentioned sliding material, and a rotating or reciprocating shaft made of light metal or aluminum-based alloy is used to cooperate with the sealing ring.

The sliding material according to the invention has a good wear resistance compared to light metal materials, and the degree of wear of the light metal material is also reduced by means of the sliding material. That is, when the relative sliding surface between the sliding material according to the present invention and the opposing or mating light metal material has oil, the sliding material according to the present invention exhibits excellent wear resistance correlation. In other words, it becomes possible to suppress the wear of the sliding material and the light metal material not to exceed a predetermined or determined amount of wear.

For example, the sliding material of the present invention can be produced by extrusion or injection molding of materials made of VICTRE-PEEK (trade name of I.C.I., UK) and/or polyether nitride, namely PEN (Idemitsu Chemical Company, Japan) and also a solid Lubricant composed of sericite.

The sliding material of the present invention contains sericite so that its own wear resistance is good and the degree of wear of mating parts such as ADC-12Z is also low. Since the fluidity of the sliding material without adding carbon fiber is improved, it is easy to manufacture the seal ring. Preferably 20-35% by weight of sericite is added to the base material consisting of PEEK and/or PEN. For the excellent self wear resistance of the sliding material and the lower wear degree of the mating parts such as light metal materials (such as ADC-12Z) of the mating parts, more preferably 30wt% of sericite is added to the PEEK and/or PEN composition in the base material. The size of the sericite is 325 mesh or smaller, and the average diameter is about 10 μ. Weigh the sericite of appropriate weight, and add the weighed sericite into the extruder to make granules. These granules are fed into an injection molding machine and molded into sealing rings.

The foregoing and other objects and features of the present invention will be more apparent from the following preferred embodiments in which the present invention is applied to a sliding member for light metal materials, as shown in the accompanying drawings.

Fig. 1 is a micrograph (× 100) of the structure of the material to be obtained after adding sericite in the PEEK base material according to the present invention;

Fig. 2 is according to the photomicrograph (×100) of the structure of the gained material after adding sericite in the PEN basic material of the present invention;

Fig. 3 is the schematic diagram of wear or wear test apparatus;

Fig. 4 is the result figure that compares wear resistance test with the D material of PEEK base material of the present invention and the synthetic resin material of contrast;

Fig. 5 is the result figure that uses PEEK as basic material to carry out wear-resisting test;

Fig. 6 is the result figure that compares wear resistance test with the D material of PEN base material of the present invention and the synthetic resin material of contrast;

Fig. 7 is the result figure that uses PEN as basic material to carry out wear-resisting test;

Fig. 8 is a sectional view of the oil leakage test instrument;

Fig. 9 is the result figure of the oil leakage test of the sealing ring made of D material of the present invention and the piston ring made of conventional materials;

Fig. 10 is a graph showing the results of a 50-hour durability test on the test apparatus shown in Fig. 8 using D material of the present invention, a conventional material, and ADC-12Z as seal rings and shafts.

Sericite with a size of 325 mesh or less and an average diameter of about 10 μ is added to the PEEK base material and/or the PEN base material. After these materials were mixed and homogenized, the mixed material was fed into an extrusion device to form pellets, which were fed into an injection molding machine in order to provide a sealed ring test piece.

The seal rings made of the sliding material according to the invention each had an outer diameter of 55 mm, an inner diameter of 50 mm and a width of 3 mm. Use a grinder to reduce the width from 3mm to 2.5mm.

Seal ring-forming samples (A, A', B, and C) for comparative tests were molded from the materials described below.

Material A: 15wt% carbon fiber and 15wt% PTFE are added to the PEEK base material.

A' material: Add 15wt% carbon fiber and 15wt% PTFE to PEN base material.

Material B: 10wt% carbon fiber and 30wt% bronze powder are added to the PTFE base material.

Material C: add 30wt% Sumi-Casper E101 (trade name of Sumitomo Chemical Co., Ltd., Japan) to the PTFE base material.

The wear resistance of each sample of the present invention and the comparative sample in a sliding state was measured, and the test conditions are listed in Table 1.

Table 1 Test device Riken type high pressure wear test device wear rate 2m/s wear time 1 hour contact with heavy objects 50kg (surface pressure = 1.2MPa) friction form ATF Lubricated Sliding Friction ATF oil supply volume 200cc/min. Oil temperature 50℃

The mating part made of ADC-12Z (JIS, Japanese Industrial Standard) has an outer diameter of 80 mm, an inner diameter of 20 mm, and a thickness of 10 mm. ATF oil is supplied to the mating parts through a 20mm center hole.

The microstructure of the sliding material of the present invention is shown in Figures 1 and 2, wherein PEEK and PEN appear as white parts, and sericite used as a filler to maintain a low degree of wear appears as dark parts.

The injection molding conditions for producing the test pieces are as follows.

Mold temperature: 150°C

Nozzle temperature: 400°C

Injection pressure: 1500kg/ ^cm2

3 is a schematic diagram of an abrasion or wear test device, in which a disk fixture 1 and a disk 2 with a diameter of 80 mm and a thickness of 10 mm made of aluminum base and gold (ADC-12Z) can be assembled separately. Lubricating oil is supplied to the center of the disc 2 through an oil channel 3 therein. A predetermined pressure is applied to the right side of the disc holder 1 (in FIG. 3 ) by suitable hydraulic means (not shown). A sample holder 4 is fitted to the rotation shaft so that the rotatable holder 4 is opposed to the holder 1 . A ring-shaped sample 5 detachably assembled with the jig 4 has an outer diameter of 55 mm, an inner diameter of 50 mm, and a width of 2.5 mm.

In this test apparatus, a disc 2 of an aluminum-based alloy is pressed onto a test specimen 5 with a predetermined pressure P applied to a disc holder 1 . When the pressure P is applied, the sample 5 rotates at a fixed speed, and lubricating oil is supplied to the sliding surface between the sample 5 and the disc 2 through the oil channel 3 .

The test apparatus was operated under the following conditions. 1) Sealed annular comparison samples made of the following materials

Material A: 15wt% carbon fiber and 15wt% PTFE are added to the PEEK base material.

A' material: Add 15wt% carbon fiber and 15wt% PTFE to PEN base material.

Material B: 10wt% carbon fiber and 30wt% bronze powder are added to the PTFE base material.

Material C: add 30wt% Sumi-Casper E101 (trade name of Sumitomo Chemical Co., Ltd., Japan) to the PTFE base material. 2) Specimen according to the invention (ring shape)

D-O materials are listed in Table 2 and Table 3. 3) The pressure of the contact surface

Apply a pressure of 12 kg/cm ² on the disc holder 1 with a suitable hydraulic device. When a pressure of 12 kg/ ^cm2 is applied to the disc jig, the disc 2 is brought into sliding contact with each sample 5 under a fixed pressure condition, and oil is supplied to the disc 2 and each sample 5 through the oil channel 3 on the sliding surface.

Lubricant: ATF

Oil temperature: 80°C

Oil supply rate: 200cc/min4) Running distance

Running distance (or continuation distance): 7.2km

The relative rotation speed of the disk 2 and each sample 5: 2m/S. 5) Determination

After each sample had run a distance of 7.2 km, the disk 2 and each sample 5 were removed from the test apparatus. For the disc 2, the bearing area of all the wear traces in the form of annular grooves formed on the sliding surface of the disc 2 was measured; for each sample 5, the amount of wear thereof was measured.

Table 2 sample D. E. f G h I PEEK 70 85 80 75 65 60 Sericite 30 15 20 25 35 40 Tensile strength 410 870 730 550 255 130

table 3 sample J K L m N o PEN 70 85 80 75 65 60 Sericite 30 15 20 25 35 40 Tensile strength 550 1050 880 650 305 155

The results obtained are shown in Figure 4-Figure 7. When using the PEEK base material as the specimen and ADC-12Z as the disk (see Figures 4 and 5), it was found that the specimens made of materials A, B, C, E, and I had a high amount of wear. When using the PEN base material as the test piece and ADC-12Z as the disc (see Figure 6 and Figure 7), it was found that the test pieces made of materials A', B, C, K and O had a large amount of wear.

In Fig. 4-Fig. 7, each upper half represents the amount of wear of each sample after a 7.2km running distance, and each lower half represents each disc (ADC-12Z sample after a 7.2km running distance The average wear depth of the back wear marks. These figures clearly show that samples B and C show a large degree of self-wear and the corresponding mating parts also show a large degree of wear. Samples A and A' are the same as the samples of the present invention The same degree of wear of the mating parts (ADC-12Z) is high.

Regarding the wear correlation between the amount of sericite added and the ADC-12Z compound material, it was found that the use of 20wt% or less sericite had an adverse effect on the wear correlation, and the use of 35wt% or more sericite showed tensile strength Low breaking strength. Spalling of the sericite from the sliding surface may also occur.

From the test results obtained it was found that the best sliding properties were obtained for samples made of materials containing PEEK and/or PEN base material and about 30% by weight of sericite (350 mesh or less). Sericite is soft without damaging the mating parts of the aluminum-based alloy.

Regarding the field of application of the sealing ring made of the sliding material of the present invention is to fit into the annular groove on the rotating shaft (ADC-12Z) for AT, the sealing ring is made of D material, the outer diameter is 52mm, the width It is 2.3mm and the thickness is 2.3mm.

Figure 8 shows the test device used to test the wear resistance of the ADC-12Z shaft, the sliding sealing of the D material seal ring relative to the ADC-12Z shaft, and the durability time of the excellent sealing performance. The rotating shaft 7 is made of ADC-12Z, and has a pair of annular grooves 8.8 on its outer surface, and sealing rings 9, 10 are embedded in the grooves. When the shaft 7 rotates, the outer peripheral surfaces of the seal rings 9, 10 are in sliding contact with the inner surface of the sleeve 11 made of carbon steel (S45C, Japanese standard). An oil supply pipe 13 with an oil gauge 12 is connected to the sleeve 11 between the sealing rings 9, 10, and an oil discharge pipe with a valve 15 is connected to the bottom wall of the sleeve 11. The oil that leaks from sealing ring 9,10 is put into cup 16 through oil discharge pipe 14, and the oil quantity in cup 16 is measured.

The test conditions are as follows.

Oil: Transmission oil for automotive transmission

Shaft speed: 2000rpm

Oil pressure: 12kg/cm ²

Test duration: 50 hours

Figure 9 shows the measured oil temperature and oil leakage results after the endurance test. The seal rings made of material D (see Table 2), the seal ring made of material B and conventional cast iron seal rings were used for the oil leakage test. The sealing ring of the present invention exhibits stable sealing performance and less increase in oil leakage over a wide range of oil temperature variations.

Fig. 10 shows the wear amount of the sliding surface of the seal ring and the wear amount of the shaft (ADC-12Z) when the oil temperature is 120°C. It was found that the D material seal rings of the present invention exhibited a lower degree of wear.

The J material of the present invention contains PEN base material and 30wt% sericite (350 mesh or less), and the durability test of the sealing ring made of J material is carried out under the same conditions as above. Measure oil leakage. The test results are the same as those of material D. That is, the sealing ring of J material exhibits stable sealing performance and less increase in oil leakage in a wide range of oil temperature variation.

While these preferred embodiments have been shown and described, it should be understood that many changes and modifications can be made without departing from the scope of the appended claims.

Claims (4)

1. A sliding material which is in sliding contact with a light metal material and has sealing oil supplied to the sliding contact surface between the two, the material contains polyether-ether ketone and sericite, wherein the added sericite is 20-35wt% . 2. A sliding material, which is in sliding contact with a light metal material and has seal oil supplied to the sliding contact surface between the two, the material contains polyether nitride and sericite, wherein the added sericite is 20-35wt%. 3. The sliding material according to claim 2, further comprising polyether-ether ketone. 4. A sealing ring made of the material of any one of claims 1, 2 and 3.

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