JPS63259041A - Combination of sliding body - Google Patents

Abstract

PURPOSE:To improve the sliding characteristic of sliding bodies by adopting a combination in which a fiber reinforced light alloy member is used for a 1st sliding body and an iron member provided with an Ni plating layer contg. hard particles is used for the 2nd sliding body. CONSTITUTION:The part around the cylinder bore 3 of a cylinder block 1 of an internal combustion engine E, etc., which cylinder is cast by using a light alloy such as Al alloy, is constituted of a cylindrical fiber reinforced part C1 consisting of reinforcing fibers and Al alloy matrix. This cylinder block 1 is the 1st sliding body. Compression rings 61, 62 and oil ring 63 are cast by using the iron members and the Ni plating layer 8 contg. the hard particles 7 is provided over the entire surface of the respective rings 61, 63 including the outer peripheral faces to slide with the cylinder bore 3. Such rings are the 2nd sliding body. The Ni plating layer of the 2nd sliding body has excellent wear resistance and has the function to suppress the wear in the sliding part of the 1st sliding body.

Description

Detailed Description of the Invention A0 Object of the Invention (11 Industrial Application Fields) The present invention relates to a combination of sliding bodies, in particular, a first sliding body is a light alloy member whose sliding portion is reinforced with reinforcing fibers. The present invention also relates to an improvement in the combination of sliding bodies in which the second sliding body is a steel-based member.

(2) Prior Art Conventionally, in this type of combination of sliding bodies, one in which a chrome plating layer is provided on the sliding surface of an iron-based member is known.

(3) Problems to be solved by the invention However, since the chromium plating layer has poor compatibility with the fiber-reinforced sliding parts, not only does the chrome plating layer suffer a large amount of wear, but also the sliding parts There is a problem of accelerating wear.

In view of the above, an object of the present invention is to improve the plating layer provided on the sliding surface of an iron-based member and to provide a combination of the sliding bodies that can exhibit excellent sliding characteristics.

B1 Structure of the Invention (1) Means for Solving the Problems The present invention provides that the first sliding body is a light alloy member whose sliding portion is reinforced with reinforcing fibers, and the second sliding body is made of iron. In the combination of sliding bodies that are system members, a nickel-based plating layer containing hard particles is provided on the sliding surface of the second sliding body.

(2) Effect Since the nickel-based plating layer containing hard particles has high hardness, it has excellent wear resistance, and therefore the amount of wear is significantly reduced. Furthermore, the nickel-based plating layer also has a function of suppressing wear of the sliding portion of the first sliding body.

Furthermore, the nickel-based plating layer has good adhesion to iron-based members, so there is no risk of peeling, and it also has heat resistance and oxidation resistance, so it exhibits excellent durability in high-temperature oxidizing environments.

(3) Embodiment FIG. 1 shows an internal combustion engine E, which includes a cylinder block 1, a cylinder head 2 attached to the cylinder block 1, and a piston 41 slidably engaged with the cylinder bore 3 of the cylinder block 1. , the first and second compression rings 6I, 6□ (Fig. 2) installed in the first and second compression ring grooves 5+, 5t of the piston 41, and the oil ring groove 5. of the piston 4I. Oil ring 6 attached to
3 (Figure 2). These first. The second compression ring 61.6□ and the oil ring 6 constitute a piston ring.

The cylinder block 1 is cast using an aluminum alloy such as JIS ADC12, and the area around the cylinder pore 3, which is the sliding part, is composed of a cylindrical fiber-reinforced part C+ made of reinforcing fibers and an aluminum alloy matrix. . Therefore, the cylinder block 1 corresponds to a first sliding body whose sliding portion is reinforced with reinforcing fibers and is a light alloy member.

Also number 1. The second compression rings 61, 6□ and the oil ring 63 are cast using spheroidal graphite cast iron such as JIS FCD75. Therefore, the first and second compression rings 63.6□ and the oil ring 63 are iron-based members. This corresponds to the second sliding body.

In the cylinder block 1, the reinforcing fibers are mixed fibers consisting of alumina fibers and carbon fibers, and the fiber volume percentage of the alumina fibers is 8 to 30%, and the fiber volume percentage of the carbon fibers is 0.3 to 15%. % respectively.

When the fiber volume fraction of the alumina fiber is set as described above, the surface pressure at the scratch limit and seizure limit around the cylinder pore 3 becomes high, and the wear resistance becomes excellent. However, when the fiber volume percentage is less than 8%, the fiber reinforcement ability is small,
In addition, wear resistance and seizure resistance are reduced. On the other hand, if the fiber volume percentage exceeds 30%, the filling properties of the aluminum alloy matrix will deteriorate, making it impossible to sufficiently strengthen the fibers, and the hardness around the cylinder pore 3 will increase, increasing the amount of wear on the mating material. Moreover, the thermal conductivity also decreases.

In the alumina-based fiber, the amount of α-alumina in the alumina component is 10 to 60% by weight, preferably 45% by weight or less, and the content of sydites of 150 μm or more is 2.5% by weight or less of the total fiber amount, and The amount of silica is set to 25% by weight or less, preferably 2 to 5% by weight. Examples of this kind of alumina-based fiber include products manufactured by IC1 Co., Ltd. under the trade name SAFIL, manufactured by DuPont Co., Ltd. under the trade name Fiber FP, and the like.

Since carbon fiber has a lubricating ability, the use of the mixed fiber can improve the scratch limit characteristics and seizure limit characteristics compared to the case where alumina fiber is used alone. However, if the fiber volume percentage of carbon fiber is less than 0.3%, the above-mentioned effect based on the lubricating ability of carbon fiber cannot be obtained, while if the fiber volume percentage exceeds 15%, the amount of alumina fiber Due to this relationship, the total fiber volume fraction becomes high, and when a molded article is obtained using the mixed fibers, the moldability deteriorates. Preferably, the carbon fiber has a Young's modulus of 20 to 30 t/s2, and examples of this type of carbon fiber include Torayka T300 manufactured by Toshisha Co., Ltd. and the like.

1st. Second compression ring 60, 6□ and oil ring 6
3, the entire surface including the outer peripheral surface, which is the sliding surface that slides on the cylinder bore 3, is coated with hard particles 7 as shown in FIG.
A nickel-based plating layer 8 containing nickel is provided by electroplating.

The appropriate thickness of the nickel-based plating layer 8 is 5 to 100 μm, and the plating metal is Ni-Co alloy, Nt
-Co-P alloy etc. are used.

This type of nickel-based plating layer 8 has good adhesion to the first compression ring 6, etc., so there is no risk of peeling, and since it has heat resistance and oxidation resistance, it can be used in an engine under a high-temperature oxidizing environment. Shows excellent durability. Among the chemical components, Go has the effect of increasing the hardness of the nickel-based plating layer 8, and its content is set at 10 to 40% by weight. If the Co content is less than 10% by weight, the above effects cannot be obtained, while if it exceeds 40% by weight, it will be difficult to form a plating layer and the surface will become rough. P has the same effect as Co, and its content is set at 2 to 10% by weight. When the P content is less than 2%, the above effects cannot be obtained;
If it exceeds 10% by weight, it becomes difficult to form a plating layer.

The hard particles 7 are contained in the nickel-based plating layer 8 by suspending the hard particles 7 in the plating solution and trapping them in the layer 8 during the formation of the nickel-based plating layer 8. This type of hard particle 7 is S i C%
BN, S i3 Na , Mo Sz, WC and AJ.
At least one type of particle selected from zCh is used. The hard particles 7 have the effect of improving the wear resistance of the nickel-based plating layer 8, and the amount of dispersion thereof is 10 to 10% in area ratio.
Set to 30%. If the amount of dispersion is less than 10%, the wear resistance will be low, while if it exceeds 30%, the hard particles 7 will not be sufficiently trapped in the nickel-based plating layer 8 and may fall off. Moreover, the average particle diameter of the hard particles 7 is 0.5~
10 μm is appropriate. If the average particle size exceeds 10 μm, the hard particles 7 will not be sufficiently trapped in the nickel-based plating layer 8, and there is a risk of them falling off. On the other hand, if the average particle size is less than 0.5 μm, it is difficult to manufacture. , and the effect of improving wear resistance is also small.

For the chip-on-disc sliding test, prepare the following discs and chips.

In order to make the disk compatible with the first compression ring 6I etc.
Cast using spheroidal graphite cast iron (JIS FCD75), hard particles with an average particle size of 3 μm are coated on the surface of the disk.
A nickel-based plating layer made of a Ni-Co-P alloy containing m of Sis Na is formed. In this case, C
The O content is 25% by weight, the P content is 6% by weight, and 5% by weight.
The amount of dispersion of izNa is 30% in terms of area ratio.

The tip was made of alumina fiber with a fiber volume ratio of 12% (gelatinization rate of 33%, SiO
□ Mixed fibers consisting of carbon fibers containing 2 to 5% by weight) and carbon fibers with a fiber volume percentage of 9%, and aluminum alloys (JIS A
DC12) Consists of a matrix.

In order to investigate the seizure characteristics, a disk was rotated at a speed of 2.5 m/sec, a chip was pressed against the disk without lubrication, and the pressing force was varied to determine the seizure limit surface pressure. We obtained the results shown in the figure. In the conventional example, the plating layer of the disk is made of chromium.

From Figure 4, in the case of the present invention, the seizure limit surface pressure is 120 kg.
/cJ, which is clearly improved compared to 100 kg/cIII of the conventional example. This improvement in the seizure limit surface pressure is mainly due to the Ni-Co-P alloy, and 5ixNa does not play a significant role.

Next, in order to investigate the wear characteristics, the disk was rotated at 12.5 m/s.
The disc was rotated at a speed of ec, and the chip was pressed against the disc under lubrication with a pressing force of 30 kg/ad, and this state was maintained until the sliding distance exceeded 6000 m to determine the amount of wear on the disc and chip. We obtained the results shown in the figure.

The amount of lubricating oil supplied is 2.5 ml/+sin. In Figure 5, line xl+X! corresponds to the present invention, and lines Y+ and Yz correspond to the conventional example.

From FIG. 5, it is clear that in the present invention, the amount of wear on the disk and chip is smaller than that of the conventional example, and this improvement in wear resistance is particularly remarkable on the disk. This confirms that the first compression ring 6I and the like have excellent wear resistance. This improvement in wear resistance is due to Ni-C.

-By the cooperation of P alloy and 5izN4.

FIG. 6 shows the first part as a sliding part. Second compression ring groove 61
, 6□ is reinforced with reinforcing fibers around the aluminum alloy piston 4□, thus indicating the first sliding body,
In this case, the second sliding body is the first sliding body. This applies to the second compression ring 68.6□. C2 is an annular fiber reinforced portion made of reinforcing fibers and an aluminum alloy matrix.

Note that in order to further improve the adhesion of the Ni-based plating layer, a copper or copper alloy plating layer may be provided on the iron-based member.

C8 Effects of the Invention According to the present invention, the sliding surface of the second sliding body is provided with a nickel-based plating layer that has high hardness and excellent wear resistance and can suppress wear of the sliding portion of the first sliding body. With this arrangement, it is possible to provide a combination of sliding bodies that exhibits excellent sliding characteristics.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional view of the internal combustion engine, Figure 2 is a perspective view of the piston ring, Figure 3 is a cross-sectional view of Figure 2 m-m8jIA, and Figure 4 is a cross-sectional view of the internal combustion engine.
5 is a graph showing seizure characteristics, FIG. 5 is a graph showing wear characteristics, and FIG. 6 is a longitudinal sectional view of a piston for an internal combustion engine. C+, Cz...Fiber reinforced part, 1.4□...Cylinder block which is the first sliding body,
Piston, 6. ~63...The first sliding body which is the second sliding body.
Second compression ring, oil ring, 7... hard particles, 8
...Nickel-based plating layer patent applicant Agent for Honda Motor Co., Ltd.
Patent Attorney Ken Ochiai 1 Figure 3 Figure 2 Figure 4 Conventional example This invention

Claims (9)

[Claims] (1) In a combination of sliding bodies in which the first sliding body is a light alloy member whose sliding portion is reinforced with reinforcing fibers, and the second sliding body is an iron-based member, the second sliding body A combination of sliding bodies characterized in that a nickel-based plating layer containing hard particles is provided on the sliding surface of the sliding body. (2) The plating metal of the nickel-based plating layer is Ni
A combination of sliding bodies according to claim 1, which is made of -Co alloy. (3) The plating metal of the nickel-based plating layer is Ni
-Co--P alloy, the combination of sliding bodies according to claim (1). (4) The hard particles are SiC, BN, Si_3N_4
, MoS_2, WC, and Al_2O_3.
1), the combination of the sliding bodies described in item (2) or item (3). (5) The amount of dispersion of the hard particles is 10 to 30% in terms of area ratio.
Claims Nos. (1), (2), and (3) are
Or a combination of the sliding bodies described in item (4). (6) The hard particles have an average particle diameter of 0.5 to 10 μm, as set forth in claim (1), (2), (3), (4), or (5). A combination of sliding bodies. (7) The reinforcing fibers are made of alumina fibers and carbon fibers, and the fiber volume percentage of the alumina fibers is 8 to 30%.
In addition, claims (1) and (2) wherein the fiber volume percentage of the carbon fibers is set to 0.3 to 15%, respectively.
, (3), (4), (5), or (6). (8) Claim No. 1, wherein the first sliding body is a cylinder block for an internal combustion engine in which the sliding portion is around a cylinder bore, and the second sliding body is a piston ring. Part (2), Part (3), Part (4), Part (5)
, a combination of the sliding bodies described in item (6) or item (7). (9) The first sliding body is a piston for an internal combustion engine in which the sliding part is around a compression ring groove, and the second sliding body is a compression ring. ,
A combination of the sliding bodies described in item (2), item (3), item (4), item (5), item (6), or item (7).