JPH07269571A - Sliding device - Google Patents

Abstract

PURPOSE:To improve the anti-seizure property by providing a sliding surface composite which consists of an aggregate of crystals having cubic system structure, to a sliding member at the side a lubricant is fed, making the surface having a specific mirror index face to the sliding surface side, and specifying the existential ratio. CONSTITUTION:A bearing holder 2 is composed of a holder main body 4 and a holder cap 5 allowable to mount and demount to the holder main body 4, an oil feeding hole 6 is formed to the holder cap 5, and an oil is fed from the sliding surface 7 of the bearing holder 2 to the sliding surface 8 of a rotation shaft 3. A layer form sliding surface composite 9 which consists of an aggregate of metal crystals having a body-centered cubic structure is formed to the outer peripheral surface of the rotation shaft 3 by a plating, and in this sliding surface composite 9, the existential ratio S of an (hhh) orientating metal crystals in which the (hhh) surface is faced to the sliding surface 8 side by the mirror index is set as >=40%. The fed oil is caught securely by the sliding surface composite 9, it is distributed to the whole body of the sliding surface 8, and the anti-seizure property can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding device, and more particularly to a sliding device in which a lubricant is supplied from a sliding surface of one sliding member to a sliding surface of another sliding member. Regarding improvement.

[0002]

2. Description of the Related Art Heretofore, as this type of sliding device, there has been known a sliding device including a rotary shaft and a bearing holder for supporting the rotary shaft.

[0003]

In the above-mentioned conventional sliding device, the seizure resistance thereof is relatively greatly affected by the runout of the rotary shaft, and the lubricant between the rotary shaft and the bearing holder must be dealt with in order to cope with this. It is necessary to improve the retention.

In view of the above, it is an object of the present invention to provide the above-mentioned sliding device which can improve the retention of the lubricant between both sliding members and improve the seizure resistance.

[0005]

SUMMARY OF THE INVENTION The present invention provides a sliding device in which a lubricant is supplied from the sliding surface of one sliding member to the sliding surface of the other sliding member. Is provided on the other sliding member on the side to which is supplied a sliding surface constituting body made of an aggregate of inorganic crystals having a cubic crystal structure, and the sliding surface constituting body has a (hhh) plane as a Miller index. The present invention is characterized in that it has an oriented inorganic crystal facing toward the sliding surface and having an abundance S of S ≧ 40% (hhh).

[0006]

[Function] In an aggregate of inorganic crystals having a cubic crystal structure, the (hhh) surface is oriented toward the sliding surface side by the mirror index (hhh).
hh) The oriented inorganic crystal grows in a columnar shape, and the tip end portion thereof is composed of pyramidal or truncated pyramidal inorganic crystals on the sliding surface. Therefore, if the abundance ratio S of the (hhh) oriented inorganic crystal is set as described above, both adjacent (hh)
h) The oriented inorganic crystals present a state of biting each other, whereby the sliding surface has a large number of fine ridges, a large number of fine valleys formed between the ridges, and the ridges. It has an intricate appearance consisting of many fine swamps due to mutual bite.

When such a sliding surface structure is provided on the sliding member on the side to which the lubricant is supplied, the supplied lubricant is reliably caught by the sliding surface structure and is generated between both members. The sliding causes the lubricant to spread over the entire sliding surface, and the lubricant is retained on the sliding surface having the complicated appearance as described above. Further, the preferential wear of the tip end side of the (hh) oriented inorganic crystal also provides good initial conformability of the sliding surface structure. In this way, seizure resistance between both members can be improved.

However, when the existence rate S of the (hhh) oriented inorganic crystal is S <40%, the appearance of the sliding surface tends to be simplified with the decrease of the (hhh) oriented inorganic crystal. The oil retaining property and the initial conformability of the composition are reduced.

[0009]

【Example】

[Embodiment 1] In FIG. 1, a sliding device 1 comprises a bearing holder 2 which is one sliding member and a rotary shaft 3 which is the other sliding member rotatably supported by the bearing holder 2. Become. The bearing holder 2 is composed of a holder body 4 and a holder cap 5 which is detachably attached to the holder body 4 in two.

An oil supply hole 6 is formed in the holder cap 5, and the sliding surface 7 of the bearing holder 2 to the sliding surface 8 of the rotary shaft 3 are formed.
The oil, which is a lubricant, is supplied to the.

A cubic crystal structure is formed on the outer peripheral surface of the rotating shaft 3 on the oil supply side. In the embodiment, an inorganic crystal having a body-centered cubic structure (bcc structure) as shown in FIG. The layered sliding surface structure 9 made of a body is formed by plating. In this sliding surface structure 9, the abundance S of oriented metal crystals (hhh) with the (hhh) surface facing the sliding surface 8 side according to the Miller index is set to S ≧ 40%.

As shown in FIG. 3, in an aggregate of metal crystals having a bcc structure, the oriented metal crystals 10 having the (hhh) plane facing the sliding surface 8 side (hhh) at the Miller index grows in a columnar shape. The tip of the sliding surface 8 is composed of hexagonal pyramidal or triangular pyramidal metal crystals 10a and 10b.
The tip may be formed of a hexagonal truncated pyramid or a triangular truncated pyramid. Therefore, when the abundance S of the (hhh) oriented metal crystal 10 is set as described above, the two adjacent hexagonal metal crystals 10a and 10b have a state of being bite into each other, which results in sliding. The surface 8 has a large number of fine crests a, a plurality of fine troughs b formed between the crests a, and a plurality of fine crests c due to the mutual biting of the crests a.
It has an intricate appearance consisting of and.

When such a sliding surface structure 9 is provided on the rotary shaft 3 on the oil supply side, the supplied oil is reliably caught by the sliding surface structure 9 and the rotary shaft 3
The oil spreads over the entire sliding surface 8 by the rotation of, and the oil is held by the sliding surface 8 having a good oil retaining property and having the complicated appearance as described above. In addition, the initial conformability of the sliding surface structure 9 is also favorable due to preferential wear of the tip end side of the hexagonal pyramidal metal crystals 10a and 10b. In this way, seizure resistance between the rotary shaft 3 and the bearing holder 2 can be improved.

However, when the abundance S of the (hhh) oriented metal crystal 10 is S <40%, the hexagonal pyramidal metal crystal 10 is present.
Since the appearance of the sliding surface 8 tends to be simplified as a and 10b are decreased, the oil retaining property and the initial conformability of the sliding surface structure 9 are deteriorated. The existence rate S includes 100%.

As shown in FIG. 4, since the inclination of the (hhh) plane with respect to the virtual surface 11 along the sliding surface 8 appears as the inclination of the hexagonal pyramidal metal crystals 10a and 10b, the sliding surface structure is formed. 9 has an effect on oil retention, initial running-in and abrasion resistance. Therefore, the inclination angle θ formed by the (hhh) plane with respect to the virtual surface 11 is set to 0 ° ≦ θ ≦ 15 °. In this case, the inclination direction of the (hhh) plane is not limited.
When the inclination angle θ is θ> 15 °, the oil retaining property, the initial running-in property and the wear resistance of the sliding surface structure 9 are deteriorated.

As a metal crystal having a bcc structure, F
Examples thereof include crystals of e, Cr, Mo, W, Ta, Zr, Nb, V, etc., or alloys thereof.

In the plating treatment for forming the sliding surface structure 9 according to the present invention, the basic conditions for performing the electric Fe plating treatment are as shown in Tables 1 and 2.

As the energizing method, the direct current method or the pulse current method is applied. In the pulse current method, as shown in FIG. 5, the current I of the plating power source is set to the time T as the current I rises from the minimum current Imin to the maximum current Imax and then to the minimum current Imin. Is controlled so that a pulse waveform is drawn with the passage of.

The energization time from the start of the rising of the current I to the start of the falling of the current I is T _ON, and from the start of the previous rising to the start of the next rising is one cycle, and the cycle time is T _c . At this time, the ratio of the energization time T _ON to the cycle time T _c , that is, the time ratio T _ON / T _c is T _ON / T _c
≦ 0.45 is set. The maximum cathode current density CDmax is CDmax ≧ 2A / dm ² , and the average cathode current density CDm
Are set to CDm ≧ 1 A / dm ² .

[0020]

[Table 1] As the organic additive, urea, saccharin or the like is used.

[0021]

[Table 2] By changing the composition of the plating bath and the processing conditions in the electric Fe plating process performed under the above conditions (hhh)
The precipitation of oriented Fe crystals and the amount thereof are controlled.

As the plating treatment, in addition to the electroplating treatment, for example, a vapor phase plating method such as PVD method, CVD method, sputtering method, ion plating and the like can be mentioned. Conditions for performing W and Mo plating by the sputtering method are, for example, Ar pressure 0.2 to 1 Pa, average Ar acceleration power DC 1 to 1.5 kW, base material temperature 150 to 300 ° C.
Is. The conditions for performing W plating by the CVD method are as follows:
For example, raw material WF ₆ , gas flow rate 2 ~ 15cc / min,
Chamber pressure 50 ~ 300Pa, Base material temperature 400 ~
600 ° C., average output of ArF excimer laser 5-40
W.

A specific example will be described below.

As shown in FIG. 6, a plurality of steel plate disks 12 and a plurality of cast iron chips 13 were prepared. Figure 7 (a)
As shown in FIG. 5, in the combination of the group of disks 12 and the chips 13, the annular outer peripheral region d of each disk 12 is subjected to the electric Fe plating treatment to form a sliding surface structure of an aggregate of Fe crystals with a thickness of 15 μm. Examples 1-5 of body 9 were formed. Further, as shown in FIG. 7B, in a combination of a group of disks 12 and chips 13, the lower surface (area 1 cm ² ) of each chip 13 is formed of an aggregate of Fe crystals by performing an electric Fe plating treatment. Examples 6 to 10 of the sliding surface construction body 9 having a thickness of 15 μm were formed.

In this case, the disk 12 rotates as indicated by arrow e, and the oil is divided by tip 13 as indicated by arrow f.
The disk 12 is supplied toward the disk 12 in front of the rear end surface 14 in the rotation direction of the disk 12. Therefore, FIG.
Examples 1 to 5 of the sliding surface structure 9 of (a) are on the oil supply side, while examples 6 to 10 of FIG. 7 (b) are on the oil supply side. At the lower edge of the end face 14 of the chip 13,
A slope 15 for guiding oil is formed on the lower surface side.

Tables 3 and 4 show Examples 1 to 5 of the sliding surface construction body 9.
The electric Fe plating processing conditions in FIG. In addition, as for the plating processing time, the thickness in Examples 1 to
Various changes were made within a range of 5 to 60 minutes to set the thickness to μm.

[0027]

[Table 3]

[0028]

[Table 4] Tables 5 and 6 show the electric Fe plating treatment conditions in Examples 6 to 10 of the sliding surface construction body 9. The plating treatment time was variously changed within the range of 5 to 60 minutes in order to set the thickness in Examples 6 to 10 to 15 μm as described above, as in the above.

[0029]

[Table 5]

[0030]

[Table 6] Tables 7 and 8 show the crystal morphology of the sliding surface 8 of Examples 1 to 5 and 6 to 10, the average grain size of Fe crystals, the abundance ratio S of oriented Fe crystals, and the hardness, respectively.

[0031]

[Table 7]

[0032]

[Table 8] The average particle diameter of the triangular pyramidal Fe crystal is the distance from each corner to each opposite side through the apex, that is, the average value of three distances, and the average particle diameter of the hexagonal pyramidal Fe crystal is the apex. It is the distance between both corners that face each other across, that is, the average value of the three distances.

The abundance S is the X-ray diffraction pattern (X
The line irradiation direction is obtained by the following method based on the direction perpendicular to the sliding surface 8). Explaining Example 3 as an example, FIG. 8 is an X-ray diffraction diagram of Example 3, and the abundance S of each oriented Fe crystal was obtained from the following equation. Note that, for example, a {110} oriented Fe crystal is {1
It means an oriented Fe crystal with the 10} plane facing the sliding surface 8 side. {110} oriented Fe crystal: S ₁₁₀ = {(I ₁₁₀ / IA
₁₁₀ ) / T} × 100, {200} oriented Fe crystal: S ₂₀₀ = {(I ₂₀₀ / IA
₂₀₀ ) / T} × 100, {211} oriented Fe crystal: S ₂₁₁ = {(I ₂₁₁ / IA)
₂₁₁ ) / T} × 100, {310} oriented Fe crystal: S ₃₁₀ = {(I ₃₁₀ / IA
₃₁₀ ) / T} × 100, {222} oriented Fe crystal: S ₂₂₂ = {(I ₂₂₂ / IA)
₂₂₂ ) / T} × 100 where I ₁₁₀ , I ₂₀₀ , I ₂₁₁ , I ₃₁₀ , and I ₂₂₂ are the measured values (cps) of the X-ray reflection intensity of each crystal plane, and IA ₁₁₀ , IA ₂₀₀ , and IA. ₂₁₁ , IA ₃₁₀ , and IA ₂₂₂ are the X-ray reflection intensity ratios of each crystal plane in the ASTM card,
IA ₁₁₀ = 100, IA ₂₀₀ = 20, IA ₂₁₁ = 30,
IA ₃₁₀ = 12 and IA ₂₂₂ = 6. Furthermore, T is T
= (I ₁₁₀ / IA ₁₁₀ ) + (I ₂₀₀ / IA ₂₀₀ ) + (I
₂₁₁ / IA ₂₁₁ ) + (I ₃₁₀ / IA ₃₁₀ ) + (I ₂₂₂ /
IA ₂₂₂ ).

FIG. 9 is a micrograph showing the crystal structure of the sliding surface 8 in Example 3. In FIG. 9, many triangular pyramidal Fe crystals are observed. This triangular pyramidal Fe crystal is (hh
It is a {222} oriented Fe crystal in which the (h) plane, and thus the {222} plane, faces the sliding surface 8 side. In this case, {22
The abundance ratio S of the 2} -oriented Fe crystals is S = 42.7% as shown in Table 7 and FIG.

FIG. 10 is an X-ray diffraction pattern of Example 5, and FIG.
3 is a micrograph showing a crystal structure of a sliding surface 8 in Example 5. In FIG. 11, many hexagonal pyramidal Fe crystals are observed. This hexagonal pyramidal Fe crystal is a {222} oriented Fe crystal in which the (hhh) plane, and therefore the {222} plane, faces the sliding surface 8 side. In this case, {222} oriented Fe
As shown in Table 7 and FIG. 10, the crystal abundance S is S = 9.
It is 3.8%.

Next, regarding Examples 1 to 10, FIG.
As shown in (b), a seizure test was performed by a chip-on-disk method in which the pressing load direction was defined as the arrow g direction, and the relationship between the abundance ratio S of {222} oriented Fe crystals and the seizure occurrence load was found. When obtained, the results shown in Table 9 and FIG. 12 were obtained. The test condition is disk rotation speed 15000rp
m, oil supply rate 150 ml / min, oil temperature at room temperature. In FIG. 12, (1) to (10) are examples 1 to 1.
Corresponds to 0 respectively.

[0037]

[Table 9] As is clear from Table 9 and FIG. 12, Examples 3 to 5 are on the oil supply side, and the abundance ratio S of {222} oriented Fe crystals is S ≧ 40%. 2,6
The seizure generating load is significantly increased as compared with Nos. 10 to 10, and it can be seen that Examples 3 to 5 have excellent seizure resistance.

[Embodiment 2] Sliding surface structure 9 shown in FIG.
Is formed on the outer peripheral surface of the rotary shaft 3, and the sliding surface structure 9 is
Two regions h existing on both sides in the axial direction so as to slide with the bearing holder 2 facing it, and an oil reservoir region (lubricant reservoir region) i between both regions h and recessed from them.
Have and.

With this structure, the oil sump region i
Thus, the seizure resistance and wear resistance of the sliding surface structure 9 can be improved as compared with the case where it does not exist.
Such an oil sump region i is formed, for example, by forming a groove on the outer peripheral surface of the rotating shaft 3.

The sliding surface structure 9 shown in FIG. 14 is formed on the outer peripheral surface of the rotary shaft 3, and the sliding surface structure 9 has two heights on both sides in the axial direction as the rotary shaft 3 swings. Surface pressure area j
And a low surface pressure region k existing between them, and the average grain size of, for example, a hexagonal pyramidal Fe crystal in both high surface pressure regions j is the average of the hexagonal pyramidal Fe crystals in the low surface pressure region k. It is set larger than the particle size. In this case, the fact that the average particle diameter is large means that the height is also high.

With this structure, as shown in FIG. 15, the hexagonal pyramidal Fe in the high surface pressure region j is generated by the deflection of the rotating shaft 3.
Even if the crystal is worn, since the average grain size is large, the valley portion b remains, and as a result, the oil retaining property in the high surface pressure region j is maintained, and the large average grain size means that the hexagonal pyramid is large. Since the hardness of the Fe-like crystals is low, the frictional force is reduced, and these can improve the seizure resistance.

The high and low surface pressure regions j and k as described above are formed by applying masking and subjecting each of the regions j and k to electric Fe plating.

The sliding surface structure 9 shown in FIG. 16 is formed on the outer peripheral surface of the rotary shaft 3, and the sliding surface structure 9 has an area m at the center in the axial direction which serves as a fulcrum of the runout of the rotary shaft 3. However, the hardness in the fulcrum region m is set higher than the hardness in the other regions, that is, the regions n on both sides in the axial direction. In this case, the average grain size of the hexagonal pyramidal Fe crystal in the fulcrum region m is small and the hardness is high.

As a result, as shown in FIG. 17, the rotating shaft 3
When the regions n on both sides are significantly worn due to the runout of the sliding surface, the central region m serves as a fulcrum of the runout, and load distribution is achieved in the fulcrum region m, so that further wear of the sliding surface structure 9 progresses. Is prevented, and the increase in shake is greatly suppressed.

Masking is applied to the fulcrum area m and the other area n as described above, and electric F is applied to each of the areas m and n.
It is formed by performing an e-plating process.

Specific examples will be described below.

A plurality of steel rotating shafts 3 and a plurality of cast iron bearing holders 2 were prepared. In a combination of a group of rotary shafts 3 and bearing holders 2, the outer peripheral surface of each rotary shaft 3 is subjected to electric Fe plating to form Examples 1 to 4 of sliding surface structure 9 made of an aggregate of Fe crystals. did.

Example 1 is the same as Example 1 in that the thickness of the sliding surface member 9 is uniform over the entire surface. Example 2 has an oil sump region i as shown in FIG. 13, Example 3 has a high surface pressure region j as shown in FIG. 14, and Example 4 has a fulcrum as shown in FIG. It has a region m.

Further, in the combination of the group of rotating shafts 3 and the bearing holders 2, an example of the sliding surface structure 9 made of an aggregate of Fe crystals by subjecting the inner peripheral surface of each bearing holder 2 to an electric Fe plating treatment Formed 5-7.

Example 5 corresponds to Example 1 in that the thickness of the sliding surface structure 9 is uniform over the entire surface. Example 6
Has an oil sump region i and corresponds to Example 2, and Example 7 has a high surface pressure region j and corresponds to Example 3.

In this case, since oil is supplied from the bearing holder 2 to the rotary shaft 3, Examples 1 to 4 of the sliding surface construction body 9 are on the oil supply side, while
Examples 5-7 are on the oil supply side.

Tables 10 and 11 show examples 1 to 1 of the sliding surface construction body 9.
The electric Fe plating processing conditions in Nos. 4 and 5 to 7 are shown.

[0053]

[Table 10]

[0054]

[Table 11] Tables 12 and 13 show the crystal morphology of the sliding surfaces of Examples 1 to 4 and 5 to 7, the average grain size of Fe crystals, the abundance S of oriented Fe crystals, and the hardness, respectively. The method for obtaining the average particle size and the abundance ratio S is the same as in Example 1.

[0055]

[Table 12]

[0056]

[Table 13] FIG. 18 is a micrograph showing the crystal structure of the fulcrum region m in Example 4, and FIG. 19 is the other region n in Example 4.
3 is a micrograph showing the crystal structure of 18 and 19, it is understood that the fulcrum region m and the other region n are composed of hexagonal pyramidal Fe crystals, and the average crystal grain size in the fulcrum region m is smaller than that in the other regions n.

Next, the following sliding test was conducted on Examples 1 to 7 to obtain the seizure-occurring surface pressure of Examples 1 to 3 and 5 to 7 and the same structure as Examples 1 to 4 and Example 3. The amount of wear of Example 3 ₁ was measured.

The sliding test conditions are as follows. Bearing holder 2 axial length p 12 mm (see FIG. 13), rotating shaft 3 diameter q 50 mm (see FIG. 13), material of rotating shaft 3 chrome molybdenum steel (JIS SCM420 carburized material), rotating speed of rotating shaft 3 6000 rpm, clearance between sliding surface structure 9 and bearing holder 2 30 μm, runout of rotating shaft 3 10 μm, oil supply amount 150 cc / min,
Oil temperature normal temperature.

In measuring the seizure-occurring surface pressure of Examples 1 to 3 and 5 to 7, the tightening load of the holder cap 5 was adjusted to change the surface pressure. Table 14 shows the measurement results.

[0060]

[Table 14] FIG. 20 is a graph showing the relationship between each of Examples 1 to 3 and 5 to 7 in Table 14 and the seizure-occurring surface pressure. It is clear from comparing Examples 1 and 5, Examples 2 and 6, and Examples 3 and 7. As described above, when the sliding surface structure 9 is provided on the oil supply side, that is, on the rotating shaft 3, the seizure resistance is significantly larger than that on the oil supply side, that is, when the bearing holder 2 is provided. improves. Example 1
Comparing 2 and 2, the seizure-occurring surface pressure is higher in Example 2 having the oil storage region i than in Example 1.

In measuring the amount of wear in Examples 1 to 3, the surface pressure was set to 30 MPa and the sliding time was set to 5 hours. The measured wear amount is a value obtained by adding the average wear amount of each of the bearing holder 2 and the sliding surface structure 9. FIG. 21 shows the measurement result.

In FIG. 21, comparing Example 1 and Example 2,
You can clearly see the oil sump effect. Further, in Example 3, since the hardness of the high surface pressure region j is low, the wear amount is large.

The wear rate measurements for Examples 4, 3 ₁ were made as follows. First, by sliding the surface pressure at 30 MPa and the sliding time at 10 hours, the other region n is abraded and the fulcrum region m is also set as the sliding region in Example 4. For 3 ₁ , the high surface pressure area j was abraded and the low surface pressure area k was also made into a sliding area.

Then, the contact pressure was set to 30 MPa and the sliding time was set to 5 hours, and the wear amount of the entire sliding surface was measured.
The measured value of the amount of wear is a value obtained by adding the average amount of wear of each of the bearing holder 2 and the sliding surface structure body 9 as described above.
FIG. 22 shows the measurement result.

[0065] As Figures 22 clear, the fulcrum area m Example 4 A HmV = 377 hardness, significantly higher than the hardness HmV = 230 low surface pressure region k of Example 3 _1, As a result, it can be seen that in Example 4, the progress of wear is prevented.

In Examples 1 and 2, the sliding surface structure 9 was composed of an aggregate of Fe crystals having a bcc structure. However, as shown in FIG. 23, the sliding surface structure 9 was a cubic crystal. You may comprise from the aggregate of the metal crystal which has a face centered cubic structure (fcc structure) which is a structure. In the aggregate, the (3hhh) surface was turned toward the sliding surface 8 side by the mirror index (3hhh).
h) The abundance S of oriented metal crystals is set to S ≧ 40% (including S = 100%).

As shown in FIG. 24, the (3hhh) oriented metal crystal 16 grows in a columnar shape, and the tip of the sliding surface 8 has a quadrangular pyramid (or a truncated pyramid shape) metal crystal 16a.
It is composed of The average particle size of the quadrangular pyramidal metal crystal 16a is the distance from each corner to the opposite corner through the apex, that is, the average value of the lengths of two diagonal lines.

As shown in FIG. 25, the inclination of the (3hhh) surface with respect to the virtual surface 11 along the sliding surface 8 appears as the inclination of a quadrangular pyramid, so that the oil retaining property and the initial conformability of the sliding surface structure 9 are shown. Affect. Therefore, the inclination angle θ formed by the (3hhh) plane with respect to the virtual surface 11 is set to 0 ° ≦ θ ≦ 15 ° for the same reason as above. In this case, (3
The inclination direction of the (hhh) plane is not limited.

A metal crystal having an fcc structure is P
Examples thereof include crystals of b, Ni, Cu, Pt, Al, Ag, Au and the like, which are simple substances or alloys.

For example, electric Ni using the pulse current method
The processing conditions for forming a sliding surface structure composed of an aggregate of Ni crystals by plating are: nickel sulfate concentration of 100 to 400 g / liter in the plating bath;
pH 3 to 6, temperature 10 to 70 ° C., maximum cathode current density CDmax ≧ 10 A / dm ² , average cathode current density CDm ≧ 2 A / dm ² , time ratio T _ON / T _c ≦ 0.45, output time T _ON ≧ 1 msec.

The abundance S of each oriented Ni crystal is obtained from the following equation based on the X-ray diffraction diagram (the X-ray irradiation direction is the direction perpendicular to the sliding surface) of the sliding surface constituting body. is there. In addition, for example, (3hhh), therefore, {311} oriented Ni crystal means oriented Ni crystal with the {311} plane facing the sliding surface side. {111} oriented Ni crystal: S ₁₁₁ = {(I ₁₁₁ / IA
₁₁₁ ) / T} × 100, {200} oriented Ni crystal: S ₂₀₀ = {(I ₂₀₀ / IA
₂₀₀ ) / T} × 100, {220} oriented Ni crystal: S ₂₂₀ = {(I ₂₂₀ / IA)
₂₂₀ ) / T} × 100, {311} oriented Ni crystal: S ₃₁₁ = {(I ₃₁₁ / IA
₃₁₁ ) / T} × 100 where I ₁₁₁ , I ₂₀₀ , I ₂₂₀ , and I ₃₁₁ are measured values (cps) of the X-ray reflection intensity of each crystal plane, and I
A ₁₁₀ , IA ₂₀₀ , IA ₂₂₀ , and IA ₃₁₁ are the X-ray reflection intensity ratios of the respective crystal planes in the ASTM card.
₁₁₁ = 100, IA ₂₀₀ = 42, IA ₂₂₀ = 21, IA
₃₁₁ = 20, and T is T = (I ₁₁₁ / IA
₁₁₁ ) + (I ₂₀₀ / IA ₂₀₀ ) + (I ₂₂₀ / IA ₂₂₀ )
+ (I ₃₁₁ / IA ₃₁₁ ).

In a sliding surface structure composed of an aggregate of metal crystals having an fcc structure, the mirror index (hh
When the abundance ratio S of (hhh) oriented metal crystals with the (h) plane (see FIG. 23) facing the sliding surface side is S ≧ 40%, at least a part of these (hhh) oriented metal crystals is A hexagonal pyramidal metal crystal similar to the above can be formed on the sliding surface. When the (hhh) oriented metal crystal is Ni, {11
1} oriented Ni crystal. In this case, the inclination angle θ of the (hhh) plane is 0 ° ≦ θ ≦ 15 °, as described above.

The sliding surface structure is applied to a component for an internal combustion engine that receives oil supply, for example, a camshaft bearing holder, a balancer shaft and the like.

The inorganic crystals are not limited to the above metal crystals, but may be ceramic crystals such as carbides, oxides and nitrides having a cubic crystal structure.

[0075]

According to the present invention, a sliding device having excellent seizure resistance is provided by providing the sliding surface structure as described above on the sliding member on the oil supply side. be able to.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first example of a sliding device.

FIG. 2 is a perspective view showing a body-centered cubic structure and its (hhh) plane.

FIG. 3 is a plan view of a main part of a sliding surface structure.

FIG. 4 is an explanatory diagram showing an inclination of a (hhh) plane in a body-centered cubic structure.

FIG. 5 is an output waveform diagram of a power supply for electroplating.

FIG. 6 is a plan view showing the relationship between a disk and a chip.

7 is a cross-sectional view taken along line 7-7 of FIG. 6, where (a) shows a case where a slide surface structure is formed on a disk and (b) shows a case where a slide surface structure is formed on a chip.

FIG. 8 is an X-ray diffraction diagram of an example of a sliding surface structure.

FIG. 9 is a micrograph showing a crystal structure of a sliding surface in an example of the sliding surface structure.

FIG. 10 is an X-ray diffraction diagram of another example of the sliding surface structure.

FIG. 11 is a micrograph showing a crystal structure of a sliding surface in another example of the sliding surface structure.

FIG. 12 is a graph showing the relationship between the abundance of {222} oriented Fe crystals and the seizure load.

FIG. 13 is a vertical sectional view of a second example of a sliding device.

FIG. 14 is a vertical sectional view of a third example of a sliding device.

FIG. 15 is a longitudinal cross-sectional view of a main part of a third example of a sliding device after wear.

FIG. 16 is a vertical sectional view of a fourth example of a sliding device.

FIG. 17 is a longitudinal cross-sectional view of a main part of a fourth example of the sliding device after being worn.

FIG. 18 is a micrograph showing a crystal structure of a sliding surface in a fulcrum region of a sliding surface structure.

FIG. 19 is a micrograph showing a crystal structure of a sliding surface in other areas excluding the fulcrum area of the sliding surface structure.

FIG. 20 is a graph showing the surface pressure of seizure in each example.

FIG. 21 is a graph showing an example of the wear amount of each example.

FIG. 22 is a graph showing another example of the wear amount of each example.

FIG. 23 is a face-centered cubic structure and its (3hhh) face;
It is a perspective view which shows the (hhh) surface.

FIG. 24 is a plan view of a main part of a sliding surface structure.

FIG. 25 is an explanatory diagram showing the inclination of the (3hhh) plane in the face-centered cubic structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sliding device 2 Bearing holder (one sliding member) 3 Rotating shaft (other sliding member) 7,8 Sliding surface 9 Sliding surface structure 10 (hhh) oriented metal crystal 16 (3hhh) orientation Metal crystal h area i Oil storage area (lubricant storage area) j High surface pressure area k Low surface pressure area m Support point area n Other areas

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Dozaka 1-4-1 Chuo, Wako-shi, Saitama Stock Research Institute Honda Technical Research Institute

Claims (6)

[Claims] 1. A sliding device adapted to supply a lubricant from a sliding surface (7) of one sliding member (2) to a sliding surface (8) of the other sliding member (3). In the above, the other sliding member (3) on the side supplied with the lubricant is provided with a sliding surface constituting body (9) made of an aggregate of inorganic crystals having a cubic crystal structure, and the sliding surface constituting body is provided. (9) is the Miller index (hh
A sliding device characterized by having an oriented inorganic crystal (10) having an abundance ratio S of S ≧ 40% (hhh) with the (h) surface facing the sliding surface side. 2. The sliding device according to claim 1, wherein the cubic crystal structure is one of a body-centered cubic structure and a face-centered cubic structure. 3. The sliding surface structure (9) comprises a region (h) that slides on the one sliding member (2) and a lubricant reservoir region (concave) that is recessed from the region (h). The sliding device according to claim 1 or 2, further comprising i). 4. The sliding surface structure (9) has a high surface pressure region (j) and a low surface pressure region (k) associated with the runout of the other sliding member (3), and The average particle diameter of the (hhh) oriented inorganic crystal (10) in the high surface pressure region (j) is set to be the (hhh) oriented inorganic crystal (1) in the low surface pressure region (k).
The average particle size of 0) is set to be larger than that of claim 1 or 2.
The sliding device described. 5. The sliding surface constructing body (9) has a region (m) which serves as a fulcrum of deflection of the other sliding member (3),
The sliding device according to claim 1 or 2, wherein the hardness in the fulcrum region (m) is set higher than the hardness in the other regions (n). 6. A sliding device adapted to supply a lubricant from a sliding surface (7) of one sliding member (2) to a sliding surface (8) of the other sliding member (3). In the other sliding member (3) on the side to which the lubricant is supplied, a sliding surface structure (9) made of an aggregate of inorganic crystals having a face-centered cubic structure
And the sliding surface structure (9) has a Miller index of (3
hhh) face toward the sliding surface and the existence rate S is S ≧ 40
% Of (3hhh) oriented inorganic crystals (16).