JP2014126096A - Half-split thrust bearing - Google Patents

Half-split thrust bearing Download PDF

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JP2014126096A
JP2014126096A JP2012282143A JP2012282143A JP2014126096A JP 2014126096 A JP2014126096 A JP 2014126096A JP 2012282143 A JP2012282143 A JP 2012282143A JP 2012282143 A JP2012282143 A JP 2012282143A JP 2014126096 A JP2014126096 A JP 2014126096A
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thrust bearing
thrust
resin coating
coating layer
outer peripheral
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JP6032552B2 (en
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Mitsutoshi Fukuda
光俊 福田
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Taiho Kogyo Co Ltd
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  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a half-split thrust bearing with excellent oil retainability.SOLUTION: A half-split thrust bearing 1 comprises a metallic back metal 2, a lining layer 4 covering an end surface 2A of the back metal 2 and a resin coating layer 6 covering this lining layer 4. In addition, the half-split thrust bearing 1 has thrust reliefs 5, 5 at both end locations in a peripheral direction of an end surface 2A acting as a sliding surface 3. Inner peripheral edge and outer peripheral edge at the resin coating layer 6 are bulged out in the same height over an entire peripheral area and thus, an outer peripheral bulged-out part 6A and an inner peripheral bulged-out part 6B are formed. In the case where a location C near the thrust relief 5 at the sliding surface 3 is locally point contacted with a thrust surface 11A of a mating member, the outer peripheral bulged-out part 6A is resiliently deformed and acts as a familiarity margin. Due to this fact, it is possible to prevent the location C and the lining layer 4 near the location C from being damaged.

Description

本発明は半割スラスト軸受に関し、より詳しくは、例えばクランクシャフトのスラスト面と摺動する半割スラスト軸受に関する。   The present invention relates to a half thrust bearing, and more particularly to, for example, a half thrust bearing that slides with a thrust surface of a crankshaft.

従来、シリンダブロックの端面に装着されてクランクシャフトのスラスト面と摺動する半割スラスト軸受は公知である（例えば特許文献１、特許文献２参照）。図５ないし図７に示すように、従来の半割スラスト軸受１は、基材となる半円状の裏金２と、この裏金２における摺動面３となる端面２Ａを被覆したライニング層４とを備えており、さらに、端面２Ａの円周方向の両端の箇所には、他の箇所よりも退没させた傾斜面からなるスラストリリーフ５、５が形成されている。 Conventionally, a half thrust bearing that is mounted on an end surface of a cylinder block and slides with a thrust surface of a crankshaft is known (see, for example, Patent Document 1 and Patent Document 2). As shown in FIGS. 5 to 7, a conventional half thrust bearing 1 includes a semicircular back metal 2 serving as a base material, and a lining layer 4 covering an end surface 2A serving as a sliding surface 3 of the back metal 2. Further, thrust reliefs 5 and 5 made of inclined surfaces which are recessed more than other portions are formed at both ends in the circumferential direction of the end surface 2A.

特開平１−１５８２１７号公報JP-A-1-158217 特開平１１−２０１１４５号公報JP-A-11-2011145

ところで、スラストリリーフ５、５を備えた従来の半割スラスト軸受１においては、次のような欠点があった。すなわち、図７、図８に示すように、半割スラスト軸受１の摺動面３とクランクシャフト１１のスラスト面１１Ａ（端面）とが摺動する際に、図８に示すように半割スラスト軸受１の摺動面３の一部がクランクシャフト１１のスラスト面１１Ａと局部的に接触することがある。その場合には、図５及び図８に矢印Ｃで示した箇所、つまり、スラストリリーフ５の隅部５Ａの近傍がスラスト面１１Ａと点接触することになり、その箇所Ｃのライニング層４が剥離したり疲労して損傷する恐れがあった。しかも、従来の半割スラスト軸受１の摺動面３はライニング層４で被覆されて平坦であるため、潤滑油の保持性が悪いという欠点があった。   Incidentally, the conventional half thrust bearing 1 provided with the thrust reliefs 5 and 5 has the following drawbacks. That is, as shown in FIGS. 7 and 8, when the sliding surface 3 of the half thrust bearing 1 and the thrust surface 11A (end surface) of the crankshaft 11 slide, the half thrust as shown in FIG. A part of the sliding surface 3 of the bearing 1 may locally contact the thrust surface 11 </ b> A of the crankshaft 11. In that case, the location indicated by the arrow C in FIGS. 5 and 8, that is, the vicinity of the corner 5 </ b> A of the thrust relief 5 is in point contact with the thrust surface 11 </ b> A, and the lining layer 4 at that location C is peeled off. There was a risk of damage due to fatigue. In addition, since the sliding surface 3 of the conventional half thrust bearing 1 is covered with the lining layer 4 and is flat, there is a disadvantage that the retention of the lubricating oil is poor.

上述した事情に鑑み、本発明は、半円状に形成された裏金と、上記裏金の端面における円周方向の両端の箇所に形成されたスラストリリーフと、該スラストリリーフを含めて上記裏金の端面を被覆したライニング層とを備えた半割スラスト軸受において、
上記ライニング層の全域を被覆して樹脂コーティング層を形成するとともに、該樹脂コーティング層の内周縁と外周縁における少なくとも上記スラストリリーフの近傍の箇所を膨出させることにより内周側膨出部及び外周側膨出部を形成したことを特徴とするものである。 In view of the circumstances described above, the present invention provides a back metal formed in a semicircular shape, thrust reliefs formed at both circumferential ends of the end surface of the back metal, and an end surface of the back metal including the thrust relief. In a half thrust bearing provided with a lining layer coated with
A resin coating layer is formed by covering the entire area of the lining layer, and at least a portion in the vicinity of the thrust relief on the inner peripheral edge and the outer peripheral edge of the resin coating layer is bulged so that A side bulging portion is formed.

上述した構成によれば、ライニング層は樹脂コーティング層によって被覆されており、しかも、樹脂コーティング層には内周側膨出部及び外周側膨出部が形成されている。そのため、半割スラスト軸受の摺動面が上記従来のように相手材と局部的に接触した場合には、上記両膨出部が弾性変形することでなじみ代として機能する。そのため、スラストリリーフの近傍におけるコーティング層が剥離したり損傷することを防止することができる。しかも、摺動面における両膨出部の間の領域は凹部となるので、そこに潤滑油が保持されやすくなる。そのため、従来と比較して潤滑油の保持性が良好な半割スラスト軸受を提供できる。   According to the above-described configuration, the lining layer is covered with the resin coating layer, and the inner peripheral bulging portion and the outer peripheral bulging portion are formed in the resin coating layer. Therefore, when the sliding surface of the half thrust bearing is in local contact with the mating member as in the conventional case, the bulging portions function as a familiar allowance by elastic deformation. Therefore, it is possible to prevent the coating layer in the vicinity of the thrust relief from being peeled off or damaged. Moreover, since the region between the two bulging portions on the sliding surface becomes a concave portion, the lubricating oil is easily held there. For this reason, it is possible to provide a half thrust bearing with better lubricating oil retention than in the past.

本発明の一実施例を示す正面図。The front view which shows one Example of this invention. 図１のＩＩ―ＩＩ線及びＩＩ‘―ＩＩ’線に沿う断面図。Sectional drawing which follows the II-II line | wire and II'-II 'line | wire of FIG. 図１のＩＩＩ−ＩＩＩ線に沿う断面図。Sectional drawing which follows the III-III line of FIG. 図２に示す箇所が相手材と摺動する時の状態を示す断面図。Sectional drawing which shows a state when the location shown in FIG. 2 slides with the other party material. 従来の半割スラスト軸受を示す正面図。The front view which shows the conventional half thrust bearing. 図５のＶＩ−ＶＩ線に沿う断面図。Sectional drawing which follows the VI-VI line of FIG. 図５のＶＩＩ―ＶＩＩ線に沿う断面図。Sectional drawing which follows the VII-VII line of FIG. 図７に示す箇所が相手材と摺動する時の状態を示す断面図。Sectional drawing which shows a state when the location shown in FIG. 7 slides with the other party material.

以下、図示実施例について本発明を説明すると、図１ないし図３において、半割スラスト軸受１は、半円状をした基材としての裏金２と、この裏金２における摺動面３となる端面２Ａの全域を被覆したライニング層４とを備えており、さらに、裏金２の端面２Ａにおける円周方向の両端の箇所には、傾斜面からなるスラストリリーフ５、５が形成されている。裏金２の材料としては鉄系の材料が用いられており、ライニング層４の材料としてはアルミ系材料、銅系材料が用いられている。このような構成は前述した従来の半割スラスト軸受１と変わるところはない。なお、本実施例において、前述した従来品と対応する部分には従来品と同じ部材番号を付している。   Hereinafter, the present invention will be described with reference to the illustrated embodiments. In FIGS. 1 to 3, a half thrust bearing 1 includes a back metal 2 as a semicircular base material, and an end surface serving as a sliding surface 3 in the back metal 2. The lining layer 4 covering the entire area of 2A is provided. Further, thrust reliefs 5 and 5 made of inclined surfaces are formed at both ends of the end surface 2A of the back metal 2 in the circumferential direction. An iron-based material is used as the material of the back metal 2, and an aluminum-based material and a copper-based material are used as the material of the lining layer 4. Such a configuration is not different from the conventional half thrust bearing 1 described above. In the present embodiment, parts corresponding to those of the conventional product described above are given the same member numbers as those of the conventional product.

しかして、本実施例は上記構成を前提としたうえで上記ライニング層４の全域を樹脂コーティング層６で被覆するとともに、該樹脂コーティング層６の断面形状を工夫することにより、上記ライニング層４の損傷を防止し、かつ摺動面３の潤滑油の保持性を向上させたものである。
すなわち、上記ライニング層４の全域は、固体潤滑剤を含む樹脂からなる樹脂コーティング層６によって被覆されている。そして、この樹脂コーティング層６は、内周縁及び外周縁を円周方向全域にわたって所定量膨出させてあり、それにより、外周側膨出部６Ａと内周側膨出部６Ｂとが形成されている。これら樹脂コーティング層６の厚さｔは３〜２０μｍに設定されており、両膨出部６Ａ、６Ｂの膨出量（高さｈ）は１〜１０μｍに設定されている（図２参照）。
このように、樹脂コーティング層６の内周縁と外周縁とは、両膨出部６Ａ，６Ｂとして同じ高さで膨出させてあり、それら両膨出部６Ａ，６Ｂの間となる中央側の領域６Ｃは相対的に両膨出部６Ａ，６Ｂよりも窪んだ状態となっている（図１、図２参照）。なお、本実施例においては、スラストリリーフ５、５の箇所も樹脂コーティング６により被覆しているが、スラストリリーフ５，５の内周縁及び外周縁となる箇所には両膨出部６Ａ，６Ｂは形成されていなくてもよい。 Thus, in the present embodiment, the entire structure of the lining layer 4 is covered with the resin coating layer 6 on the assumption of the above-described configuration, and the cross-sectional shape of the resin coating layer 6 is devised so that This prevents damage and improves the retention of the lubricating oil on the sliding surface 3.
That is, the entire area of the lining layer 4 is covered with the resin coating layer 6 made of a resin containing a solid lubricant. The resin coating layer 6 has an inner peripheral edge and an outer peripheral edge bulged by a predetermined amount over the entire circumferential direction, thereby forming an outer peripheral bulged portion 6A and an inner peripheral bulged portion 6B. Yes. The thickness t of these resin coating layers 6 is set to 3 to 20 μm, and the bulging amounts (height h) of both bulging portions 6A and 6B are set to 1 to 10 μm (see FIG. 2).
As described above, the inner peripheral edge and the outer peripheral edge of the resin coating layer 6 are bulged at the same height as the bulged portions 6A and 6B, and the central side between the bulged portions 6A and 6B. The region 6C is relatively indented from both the bulging portions 6A and 6B (see FIGS. 1 and 2). In this embodiment, the locations of the thrust reliefs 5 and 5 are also covered with the resin coating 6, but the bulging portions 6A and 6B are provided at the locations of the inner and outer peripheral edges of the thrust reliefs 5 and 5. It may not be formed.

次に、本実施例のスラストワッシャ１の製造工程を説明する。先ず、鉄系材料からなる半円状の裏金２を用意し、その裏金２の端面２Ａにおける円周方向の両端の箇所を切削加工して、両スラストリリーフ５、５を形成する。その後、スラストリリーフ５，５の箇所を含めて、摺動面３となる端面２Ａの全域に同一厚さでライニング層４を形成する。ライニング層４の材料としてはアルミ系材料、銅系材料を用いる。
次に、上記ライニング層４の表面全域にロールコーティングにより固体潤滑剤を含む樹脂を塗布して上記樹脂コーティング層６を形成する。このロールコーティングの際には、樹脂が乾燥する際の表面張力を利用して、摺動面３における内周縁及び外周縁の箇所が円周方向において連続するように膨出させる（図１参照）。それにより、上述したように、外方側膨出部６Ａ及び内方側膨出部６Ｂが所定量膨出して形成されるようになっている（図２、図３参照）。なお、樹脂の乾燥時の表面張力の上昇度合いが大きいほど、両膨出部６Ａ，６Ｂの膨出量は大きくなり、他方、乾燥時の表面張力の上昇度合いが小さいほど両膨出部６Ａ，６Ｂの膨出量は小さくなる。また、樹脂の乾燥時の表面張力の上昇度合いを極端に小さくすると、摺動面３の内周縁及び外周縁での膨出はなくなり、それらの箇所よりもそれらの間の中央となる領域の方が膨出する中高形状となる。
なお、上述した製造工程に限らず、次のようにして両膨出部６Ａ，６Ｂを形成してもよい。つまり、先ず、ライニング層４の全域にわたって同一の厚さで樹脂コーティング層６を形成した後に、該樹脂コーティング層６における外周縁と内周縁を除いてそれらの間の領域を所定深さで切削することにより、両膨出部６Ａ，６Ｂと中央側の凹部６Ｃを形成してもよい。さらに、内周縁及び外周縁となる箇所を複数回にわたって樹脂を塗り重ねて両膨出部６Ａ，６Ｂを形成してもよい。 Next, the manufacturing process of the thrust washer 1 of the present embodiment will be described. First, a semicircular back metal 2 made of an iron-based material is prepared, and both end portions in the circumferential direction on the end surface 2A of the back metal 2 are cut to form both thrust reliefs 5 and 5. Thereafter, the lining layer 4 is formed with the same thickness over the entire end surface 2A, which is the sliding surface 3, including the thrust reliefs 5 and 5. As the material of the lining layer 4, an aluminum material or a copper material is used.
Next, the resin coating layer 6 is formed by applying a resin containing a solid lubricant to the entire surface of the lining layer 4 by roll coating. At the time of this roll coating, the surface tension when the resin dries is used to bulge the inner peripheral edge and the outer peripheral edge of the sliding surface 3 so as to be continuous in the circumferential direction (see FIG. 1). . Thereby, as described above, the outer side bulging portion 6A and the inner side bulging portion 6B are formed to bulge by a predetermined amount (see FIGS. 2 and 3). In addition, as the degree of increase in the surface tension during drying of the resin increases, the amount of swelling of the two bulging portions 6A and 6B increases. On the other hand, as the degree of increase in the surface tension during drying decreases, both the bulging portions 6A and 6B. The bulge amount of 6B becomes small. Also, if the degree of increase in surface tension during drying of the resin is made extremely small, the swells at the inner and outer peripheral edges of the sliding surface 3 are eliminated, and the region in the center between them is located rather than those places. It becomes a medium-high shape that bulges.
In addition, not only the manufacturing process mentioned above but you may form both bulging parts 6A and 6B as follows. That is, first, after forming the resin coating layer 6 with the same thickness over the entire area of the lining layer 4, the region between the outer periphery and the inner periphery of the resin coating layer 6 is cut at a predetermined depth except for the outer periphery and the inner periphery. By doing so, the bulging portions 6A and 6B and the concave portion 6C on the center side may be formed. Further, the bulging portions 6A and 6B may be formed by applying a resin to the inner peripheral edge and the outer peripheral edge a plurality of times.

以上のように構成された本実施例の半割スラスト軸受１は、ライニング層４を被覆して樹脂コーティング層６を備えるとともに、樹脂コーティング層６に両膨出部６Ａ，６Ａが形成されているので、次のような効果を得ることができる。つまり、スラスト軸受１の摺動面３が、相手材であるクランクシャフト１１のスラスト面１１Ａと摺動している際に、スラストリリーフ５の隅部５Ａの近傍の箇所Ｃ（図１参照）がスラスト面１１Ａと点接触した場合には、肉厚の外周側膨出部６Ａが存在し、そこが弾性変形する（図４参照）。換言すると、この図４に示した状態となっても、外周側膨出部６Ａがなじみ代として機能するので、片当たりの箇所Ｃにおけるライニング層４（摺動面３）が剥離したり損傷することを防止することができる。
また、樹脂コーティング層６は両膨出部６Ａ，６Ｂが膨出することで、それらの間となる中央の領域６Ｃが窪んだ状態となっているので、中央の領域６Ｃ内に潤滑油Ｏが保持され易くなっている（図４参照）。つまり、上記従来のスラスト軸受１と比較して摺動面３における潤滑油Ｏの保持性が良好である。
以上のように本実施例によれば摺動面３の損傷を防止し、かつ摺動面３における潤滑油の保持性が良好な半割スラスト軸受１を提供することができる。 The half thrust bearing 1 of the present embodiment configured as described above includes a lining layer 4 and a resin coating layer 6, and both bulging portions 6 A and 6 A are formed in the resin coating layer 6. Therefore, the following effects can be obtained. That is, when the sliding surface 3 of the thrust bearing 1 slides with the thrust surface 11A of the crankshaft 11 which is the counterpart material, a location C (see FIG. 1) near the corner 5A of the thrust relief 5 In the case of point contact with the thrust surface 11A, there is a thick outer peripheral bulging portion 6A, which is elastically deformed (see FIG. 4). In other words, even when the state shown in FIG. 4 is obtained, the outer peripheral side bulging portion 6A functions as a conforming allowance, so that the lining layer 4 (sliding surface 3) at the portion C per piece is peeled off or damaged. This can be prevented.
Further, since the resin coating layer 6 has both the bulging portions 6A and 6B bulging, the central region 6C between them is depressed, so that the lubricating oil O is contained in the central region 6C. It is easily held (see FIG. 4). That is, the retaining property of the lubricating oil O on the sliding surface 3 is better than that of the conventional thrust bearing 1.
As described above, according to the present embodiment, it is possible to provide the half thrust bearing 1 which prevents the sliding surface 3 from being damaged and has a good lubricating oil retaining property on the sliding surface 3.

なお、上記実施例においては、内周縁及び外周縁を円周方向に連続させて両膨出部６Ａ，６Ｂを形成しているが、少なくともスラストリリーフ５の隅部５Ａの近傍及び隣接箇所を膨出させて両膨出部６Ａ，６Ｂを形成してもよい。換言すると、内周縁及び外周縁の円周方向における両端部の箇所のみに両膨出部６Ａ，６Ｂを形成して、円周方向の中央側の箇所は膨出させない構成を採用してもよい。
また、上述した実施例は摺動面３に放射方向の油溝が形成されていない半割スラスト軸受１に本発明を適用した場合を説明しているが、特許文献２のように摺動面に放射方向の油溝を備えた半割スラスト軸受にも本発明を適用することができる。 In the above embodiment, the inner peripheral edge and the outer peripheral edge are continuously formed in the circumferential direction to form both the bulging portions 6A and 6B. However, at least the vicinity of the corner 5A and the adjacent portion of the thrust relief 5 are expanded. Both bulging portions 6A and 6B may be formed. In other words, a configuration may be adopted in which the bulging portions 6A and 6B are formed only at the positions of both end portions in the circumferential direction of the inner peripheral edge and the outer peripheral edge and the central position in the circumferential direction is not expanded. .
Moreover, although the Example mentioned above has demonstrated the case where this invention is applied to the half thrust bearing 1 in which the oil groove of the radial direction is not formed in the sliding surface 3, a sliding surface like patent document 2 is demonstrated. The present invention can also be applied to a half thrust bearing provided with radial oil grooves.

１‥半割スラスト軸受 ２‥裏金
３‥摺動面 ４‥ライニング層
５‥スラストリリーフ ６‥樹脂コーティング層
６Ａ‥外周側膨出部 ６Ｂ‥内周側膨出部 DESCRIPTION OF SYMBOLS 1 ... Half thrust bearing 2 Back metal 3 Sliding surface 4 Lining layer 5 Thrust relief 6 Resin coating layer 6A Outer bulge 6B Inner bulge

Claims (4)

半円状に形成された裏金と、上記裏金の端面における円周方向の両端の箇所に形成されたスラストリリーフと、該スラストリリーフを含めて上記裏金の端面を被覆したライニング層とを備えた半割スラスト軸受において、
上記ライニング層の全域を被覆して樹脂コーティング層を形成するとともに、該樹脂コーティング層の内周縁と外周縁における少なくとも上記スラストリリーフの近傍の箇所を膨出させることにより内周側膨出部及び外周側膨出部を形成したことを特徴とする半割スラスト軸受。 A half provided with a back metal formed in a semicircular shape, a thrust relief formed at both circumferential ends of the end surface of the back metal, and a lining layer covering the end surface of the back metal including the thrust relief In split thrust bearings,
A resin coating layer is formed by covering the entire area of the lining layer, and at least a portion in the vicinity of the thrust relief on the inner peripheral edge and the outer peripheral edge of the resin coating layer is bulged so that A half thrust bearing characterized by forming a side bulge. 上記内周側膨出部及び外周側膨出部は、スラストリリーフの箇所を除いて円周方向に連続させて形成されており、上記内周側膨出部及び外周側膨出部の膨出量は同一に設定されていることを特徴とする請求項１に記載の半割スラスト軸受。   The inner circumferential bulging portion and the outer circumferential bulging portion are formed continuously in the circumferential direction except for the thrust relief, and the bulging of the inner circumferential bulging portion and the outer circumferential bulging portion. The half thrust bearing according to claim 1, wherein the amounts are set to be the same. 上記樹脂コーティング層は、固体潤滑剤を含む樹脂からなることを特徴とする請求項１又は請求項２に記載の半割スラスト軸受。   The half thrust bearing according to claim 1, wherein the resin coating layer is made of a resin containing a solid lubricant. 上記樹脂コーティング層の厚さは３〜２０μｍに設定されており、上記内周側膨出部及び外周側膨出部の膨出量は１〜１０μｍに設定されていることを特徴とする請求項１から請求項３のいずれかに記載の半割スラスト軸受。   The thickness of the resin coating layer is set to 3 to 20 µm, and the bulge amounts of the inner peripheral bulge portion and the outer peripheral bulge portion are set to 1 to 10 µm. The half thrust bearing according to any one of claims 1 to 3.
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WO2017202548A1 (en) * 2016-05-23 2017-11-30 Volkswagen Aktiengesellschaft Arcuate thrust plate for a cylinder crankcase of a reciprocating piston internal combustion engine
JP6391747B1 (en) * 2017-03-30 2018-09-19 三菱重工業株式会社 Crosshead bearing, crosshead, frame, crosshead internal combustion engine
JP2020128773A (en) * 2019-02-08 2020-08-27 大同メタル工業株式会社 Half-split thrust bearing for crank shaft of internal combustion engine
DE102020200943B4 (en) 2019-02-08 2021-09-16 Daido Metal Company Ltd. HALF THRUST BEARING FOR THE CRANKSHAFT OF A COMBUSTION ENGINE

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JPH11201145A (en) * 1998-01-12 1999-07-27 Daido Metal Co Ltd Half trust bearing
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017202548A1 (en) * 2016-05-23 2017-11-30 Volkswagen Aktiengesellschaft Arcuate thrust plate for a cylinder crankcase of a reciprocating piston internal combustion engine
JP6391747B1 (en) * 2017-03-30 2018-09-19 三菱重工業株式会社 Crosshead bearing, crosshead, frame, crosshead internal combustion engine
WO2018179930A1 (en) * 2017-03-30 2018-10-04 三菱重工業株式会社 Crosshead bearing, crosshead, frame, and crosshead internal combustion engine
JP2018169020A (en) * 2017-03-30 2018-11-01 三菱重工業株式会社 Cross head bearing, cross head, frame and cross head type internal combustion engine
JP2020128773A (en) * 2019-02-08 2020-08-27 大同メタル工業株式会社 Half-split thrust bearing for crank shaft of internal combustion engine
DE102020200943B4 (en) 2019-02-08 2021-09-16 Daido Metal Company Ltd. HALF THRUST BEARING FOR THE CRANKSHAFT OF A COMBUSTION ENGINE
DE102020200947B4 (en) 2019-02-08 2021-09-16 Daido Metal Company Ltd. HALF THRUST BEARING FOR THE CRANKSHAFT OF A COMBUSTION ENGINE

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