JP7797972B2 - Manufacturing method of rolling bearing unit - Google Patents
Manufacturing method of rolling bearing unitInfo
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- JP7797972B2 JP7797972B2 JP2022109317A JP2022109317A JP7797972B2 JP 7797972 B2 JP7797972 B2 JP 7797972B2 JP 2022109317 A JP2022109317 A JP 2022109317A JP 2022109317 A JP2022109317 A JP 2022109317A JP 7797972 B2 JP7797972 B2 JP 7797972B2
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Description
本発明は、転がり軸受と、金属製又は樹脂製のハウジングとが一体化した転がり軸受ユニットの製造方法、並びに転がり軸受ユニットに関する。 The present invention relates to a method for manufacturing a rolling bearing unit in which a rolling bearing is integrated with a metal or resin housing, and to the rolling bearing unit itself.
従来より、ピローブロックやプランマブロックなどのように、例えば、特許文献１や２に示すような、転がり軸受と、金属製のハウジングとが一体化した転がり軸受ユニットが広く使用されている。また、転がり軸受と、樹脂製のハウジングとが一体化した転がり軸受ユニットも広く知られている。 Conventionally, rolling bearing units such as pillow blocks and plummer blocks, in which a rolling bearing is integrated with a metal housing, as shown in Patent Documents 1 and 2, for example, have been widely used. Rolling bearing units in which a rolling bearing is integrated with a plastic housing are also widely known.
図６は、転がり軸受ユニット１の一例として従来のプランマブロックを模式的に示す断面図である。ハウジング１００は、上ハウジング１００Ａと下ハウジング１００Ｂとの２分割構造であり、上ハウジング１００Ａ及び下ハウジング１００Ｂには、それぞれ半円筒状の軸受収容部１０１Ａ，１０１Ｂが形成されている。そして、下ハウジング１００Ｂの軸受収容部１０１Ｂに転がり軸受１０の下半分が収容され、また、上ハウジング１００Ａの軸受収容部１０１Ａに転がり軸受１０の上半分が収容されるように、上ハウジング１００Ａを被せ、上ハウジング１００Ａと下ハウジング１００Ｂとをボルト締めする。
これにより、上ハウジング１００Ａと下ハウジング１００Ｂとが連結されるとともに、軸受収容部１０１Ａ，１０１Ｂで形成される円筒状の軸受収容部１０１に転がり軸受１０が収容され、転がり軸受１０とハウジング１００とが一体化する。
6 is a cross-sectional view showing a conventional plummer block as an example of the rolling bearing unit 1. The housing 100 has a two-part structure consisting of an upper housing 100A and a lower housing 100B, and semi-cylindrical bearing accommodating portions 101A and 101B are formed in the upper housing 100A and the lower housing 100B, respectively. The upper housing 100A is placed over the lower housing 100B, and the upper half of the rolling bearing 10 is accommodated in the bearing accommodating portion 101A of the upper housing 100A, and the upper and lower housings 100A and 100B are fastened together with bolts.
As a result, the upper housing 100A and the lower housing 100B are connected, and the rolling bearing 10 is accommodated in the cylindrical bearing accommodating portion 101 formed by the bearing accommodating portions 101A and 101B, and the rolling bearing 10 and the housing 100 are integrated.
しかしながら、上ハウジング１００Ａの軸受収容部１０１Ａ及び下ハウジング１００Ｂの軸受収容部１０１Ｂの各内周面は、転がり軸受１０の外輪外周面との接触面となるため、加工精度を十分に高める必要があり、加工に手間がかかる。また、上ハウジング１００Ａの合わせ面１０２Ａや、下ハウジング１００Ｂの合わせ面１０２Ｂの加工も必要になる。更には、転がり軸受１０を下ハウジング１００Ｂの軸受収容部１０１Ｂに収容し、上ハウジング１００Ａを被せてボルト締めを行う工程も必要になる。このように、組立作業が必要で、加工も複雑になるため、コスト高は避けられない。 However, because the inner peripheral surfaces of bearing accommodating portion 101A of upper housing 100A and bearing accommodating portion 101B of lower housing 100B come into contact with the outer peripheral surface of the outer ring of rolling bearing 10, they must be machined with sufficient precision, resulting in time-consuming machining. Furthermore, mating surface 102A of upper housing 100A and mating surface 102B of lower housing 100B also need to be machined. Furthermore, a process is required to accommodate rolling bearing 10 in bearing accommodating portion 101B of lower housing 100B, then cover with upper housing 100A and tighten the bolts. As such, the assembly work required and the complex machining process inevitably result in high costs.
なお、図示は省略するが、ピローブロックでは、ハウジングが２分割ではないものの、転がり軸受の押し込み工程や、軸受収容部の内周面の加工を要する。 Although not shown in the illustration, with a pillow block, even though the housing is not divided into two parts, a process for pressing in the rolling bearing and machining of the inner surface of the bearing accommodating portion are required.
加えて、転がり軸受に過度なトルクや荷重がかかることにより、転がり軸受の外輪とハウジングの内周面とが摺動してしまうという現象や、転がり軸受の軌道輪が、運転中に軸又はハウジングに対して移動するクリープ現象が生じるおそれもある。 In addition, excessive torque or load applied to the rolling bearing may cause the outer ring of the rolling bearing to slide against the inner surface of the housing, or may cause creep, in which the raceway of the rolling bearing moves relative to the shaft or housing during operation.
本発明は、かかる問題点に鑑みてなされたものであり、転がり軸受と、金属製又は樹脂製のハウジングとの一体化に際して、組立作業や転がり軸受の押し込み作業、複雑な加工を必要とせず、製造工程を容易にして低コスト化を図ることを目的とする。 The present invention was made in consideration of these problems, and aims to simplify the manufacturing process and reduce costs when integrating a rolling bearing with a metal or plastic housing, eliminating the need for assembly work, pressing the rolling bearing into place, or complex processing.
本発明の上記目的は、転がり軸受ユニットの製造方法に係る下記［１］の構成により達成される。 The above object of the present invention is achieved by the following configuration [1] relating to a manufacturing method of a rolling bearing unit.
［１］ 転がり軸受と、金属製又は樹脂製のハウジングとが一体化した転がり軸受ユニットの製造方法において、
前記転がり軸受をコアとして前記ハウジング用の金型に装着し、前記金型に金属溶湯又は溶融樹脂を流し込み、凝固させる、転がり軸受ユニットの製造方法。
[1] A method for manufacturing a rolling bearing unit in which a rolling bearing and a metal or resin housing are integrated,
A method for manufacturing a rolling bearing unit, comprising: mounting the rolling bearing as a core in a mold for the housing; pouring molten metal or molten resin into the mold; and allowing it to solidify.
また、転がり軸受ユニットの製造方法に係る本発明の好ましい実施形態は、以下の［２］～［５］に関する。 Furthermore, preferred embodiments of the present invention relating to the manufacturing method of a rolling bearing unit relate to the following [2] to [5].
［２］ 前記転がり軸受の外輪及び内輪の少なくとも一方を冷却しながら、前記金型に前記金属溶湯又は溶融樹脂を流し込み、凝固させる、［１］に記載の転がり軸受ユニットの製造方法。
［３］ 前記転がり軸受の内輪と外輪との間の空間に潤滑油を供給しながら、前記金型に前記金属溶湯又は溶融樹脂を流し込み、凝固させる、［１］又は［２］に記載の転がり軸受ユニットの製造方法。
［４］ 前記転がり軸受にグリースを充填した状態で、前記金型に前記金属溶湯又は溶融樹脂を流し込み、凝固させる、［１］又は［２］に記載の転がり軸受ユニットの製造方法。
［５］ 前記金属溶湯が、アルミニウム合金又はマグネシウム合金の溶湯である、［１］～［４］のいずれか１つに記載の転がり軸受ユニットの製造方法。
[2] A method for manufacturing a rolling bearing unit according to [1], wherein the molten metal or molten resin is poured into the mold and solidified while cooling at least one of the outer ring and the inner ring of the rolling bearing.
[3] A method for manufacturing a rolling bearing unit according to [1] or [2], wherein the molten metal or molten resin is poured into the mold and solidified while supplying lubricating oil to the space between the inner ring and the outer ring of the rolling bearing.
[4] A method for manufacturing a rolling bearing unit according to [1] or [2], wherein the molten metal or molten resin is poured into the mold and solidified in a state where the rolling bearing is filled with grease.
[5] The method for manufacturing a rolling bearing unit according to any one of [1] to [4], wherein the molten metal is a molten aluminum alloy or a molten magnesium alloy.
また、本発明の上記目的は、転がり軸受ユニットに係る下記［６］及び［７］の構成により達成される。 Furthermore, the above-mentioned object of the present invention is achieved by the following rolling bearing unit configurations [6] and [7].
［６］ 転がり軸受と、金属製のハウジングとが一体化した転がり軸受ユニットにおいて、
前記転がり軸受をコアとする前記ハウジングとの鋳造品である、転がり軸受ユニット。
［７］ 転がり軸受と、樹脂製のハウジングとが一体化した転がり軸受ユニットにおいて、
前記転がり軸受をコアとする前記ハウジングとの射出成形品である、転がり軸受ユニット。
[6] A rolling bearing unit in which a rolling bearing and a metal housing are integrated,
A rolling bearing unit is a casting of the housing with the rolling bearing as a core.
[7] A rolling bearing unit in which a rolling bearing and a resin housing are integrated,
A rolling bearing unit is an injection molded product of the housing and the rolling bearing as a core.
本発明によれば、転がり軸受と、金属製又は樹脂製のハウジングとの一体化に際して、組立作業や転がり軸受の押し込み作業、ハウジングの複雑な加工を必要とせず、製造工程が容易になり、低コスト化を図ることができる。 According to the present invention, integrating a rolling bearing with a metal or plastic housing does not require assembly work, pressing the rolling bearing into place, or complex machining of the housing, simplifying the manufacturing process and reducing costs.
本発明者らは、上記課題を解決するため鋭意検討を重ねた結果、転がり軸受をコアとし、金属製のハウジングを鋳造して一体化、又は樹脂製のハウジングを射出成形して一体化することが有効であることを見出した。 After extensive research to solve the above problems, the inventors discovered that it would be effective to use the rolling bearing as a core and integrate it with a metal housing by casting, or with a resin housing by injection molding.
以下、実施の形態を例示して本発明を詳細に説明するが、本発明はこれに限定されるものではない。また、実施の形態には種々の変更又は改良を加えることが可能であり、その様な変更又は改良を加えた形態も本発明に含まれ得る。 The present invention will be described in detail below using exemplary embodiments, but the present invention is not limited to these. Furthermore, various modifications and improvements can be made to the embodiments, and such modifications and improvements may also be included in the present invention.
［実施の形態１］
本発明の転がり軸受ユニットは、転がり軸受と、金属製又は樹脂製のハウジングとを鋳造により一体化したものである。
[First Embodiment]
The rolling bearing unit of the present invention is formed by integrating a rolling bearing with a metal or resin housing by casting.
図１は、本発明に係る転がり軸受ユニットの製造方法の実施の形態１を示す模式図である。製造に際して、まず、図１に示すように、転がり軸受１０をコアとしてハウジング用の下金型５０Ｂに装着し、上金型５０Ａで覆い、型締めした後、上金型５０Ａの適所に形成した注湯口（図示せず）から金属溶湯又は溶融樹脂（図示せず）を流し込み、転がり軸受１０と上金型５０Ａと下金型５０Ｂとの空所５５に金属溶湯又は溶融樹脂を充填する。また、上金型５０Ａ及び下金型５０Ｂには、それぞれ転がり軸受１０の外径及び内径に相当するリング状の溝５１Ａ，５１Ｂが設けられており、転がり軸受１０を位置規制している。なお。空所５５としては、図６に示したようなハウジング１００の形状など、任意に選択できる。 1 is a schematic diagram showing a first embodiment of a manufacturing method for a rolling bearing unit according to the present invention. During manufacturing, as shown in FIG. 1, the rolling bearing 10 is first mounted as a core in the lower housing mold 50B, which is then covered with the upper mold 50A and clamped. After that, molten metal or molten resin (not shown) is poured into the cavity 55 between the rolling bearing 10, the upper mold 50A, and the lower mold 50B through a pouring spout (not shown) formed in an appropriate position in the upper mold 50A, filling the cavity 55 between the rolling bearing 10, the upper mold 50A, and the lower mold 50B with the molten metal or molten resin. The upper mold 50A and the lower mold 50B are provided with ring-shaped grooves 51A and 51B corresponding to the outer and inner diameters of the rolling bearing 10, respectively, to position the rolling bearing 10. The cavity 55 can be any shape, such as the shape of the housing 100 shown in FIG. 6.
転がり軸受１０には制限はなく、玉軸受やころ軸受、自動調心軸受など任意に選択可能である。また、外輪外周面の加工時に粗い加工をすることや、ショットピーニングや摺動方向と垂直の溝切をすることにより、ハウジング１００との密着性が高まり、クリープ現象をより抑えることが可能になる。 There are no restrictions on the rolling bearing 10, and any type can be selected, such as a ball bearing, roller bearing, or self-aligning bearing. Furthermore, rough machining of the outer ring outer surface, shot peening, or groove cutting perpendicular to the sliding direction can improve adhesion to the housing 100, further suppressing creep.
溶湯となる金属の種類にも制限はなく、ハウジングとしての強度を考慮して任意に選択可能であるが、転がり軸受１０の外輪と接するため、熱的影響を考慮すると、低融点の金属が好ましく、例えば、アルミニウム合金やマグネシウム合金が好適である。また、線膨張係数は、鉄が１１．８～１２．１［×１０－６／Ｋ］であるのに比べて、マグネシウムは２５．４～２６［×１０－６／Ｋ］、アルミニウムは２３～２３．５［×１０－６／Ｋ］と大きいことから、金属溶湯が凝固する際に収縮する方向にあるため、転がり軸受１０とハウジング１００との間がマイナスすき間となり、ハウジング／軸受間が摺動しにくくなると考えられることから、アルミニウム合金やマグネシウム合金が好適であるといえる。
また、樹脂の膨張係数は、一般的に１１～２０［×１０－５／Ｋ］であって、上記マグネシウムやアルミニウムと同様、比較的大きいことから、転がり軸受と、樹脂製のハウジングとが一体化した、射出成形により形成される転がり軸受ユニットの場合においても、ハウジング／軸受間が摺動しにくくなると考えられる。
There are no restrictions on the type of metal to be used as the molten metal, and any metal can be selected taking into consideration the strength of the housing, but a metal with a low melting point, such as an aluminum alloy or magnesium alloy, is preferred in consideration of the thermal effects of contact with the outer ring of the rolling bearing 10. Furthermore, the linear expansion coefficient of iron is 11.8 to 12.1 [×10 −6 /K], while that of magnesium is 25.4 to 26 [×10 −6 /K] and that of aluminum is 23 to 23.5 [×10 −6 /K], which are large, and so the molten metal tends to contract when solidifying, resulting in a negative clearance between the rolling bearing 10 and the housing 100, making it difficult for the housing to slide between the bearing, and therefore an aluminum alloy or magnesium alloy is preferred.
Furthermore, the expansion coefficient of resin is generally 11 to 20 [×10 −5 /K], which is relatively large, similar to the above-mentioned magnesium and aluminum. Therefore, even in the case of a rolling bearing unit formed by injection molding in which the rolling bearing and the resin housing are integrated, it is thought that sliding between the housing and the bearing will be difficult.
そして、全体を自然冷却し、空所５５に充填した金属溶湯又は溶融樹脂を凝固させた後、型を開くことにより、図２に示すような本実施形態に係る転がり軸受ユニット１が得られる。この転がり軸受ユニット１は、図６に示した従来のプランマブロックのようにハウジング１００が２分割ではなく、ハウジング１００と転がり軸受１０とが一体化した鋳造品又は射出成形品である。そのため、上ハウジング１００Ａと下ハウジング１００Ｂとの合わせ面１０２Ａ，１０２Ｂがなく、軸受収容部１０１の内周面の加工も不要である。更には、軸受収容部１０１に転がり軸受１０を押し込む工程も不要である。 The entire assembly is then allowed to cool naturally, solidifying the molten metal or molten resin filled in the cavity 55, and the mold is then opened to obtain the rolling bearing unit 1 according to this embodiment, as shown in Figure 2. Unlike the conventional plummer block shown in Figure 6, in which the housing 100 is divided into two parts, this rolling bearing unit 1 is a cast or injection-molded product in which the housing 100 and rolling bearing 10 are integrated. Therefore, there are no mating surfaces 102A, 102B between the upper housing 100A and the lower housing 100B, and no machining of the inner surface of the bearing receiving portion 101 is required. Furthermore, the process of pressing the rolling bearing 10 into the bearing receiving portion 101 is also unnecessary.
［実施の形態２］
図３は、本発明に係る転がり軸受ユニットの製造方法の実施の形態２を示す模式図である。金属溶湯又は溶融樹脂による転がり軸受１０への熱的影響を軽減するために、図３に示すように、転がり軸受１０の内輪に挿通される軸（図示せず）に相当する冷却水流通管６０を用いることもできる。この冷却水流通管６０に冷却水を流通させながら、空所５５に金属溶湯又は溶融樹脂を流し込むことにより、転がり軸受１０の内輪から転動体、外輪へと順次冷却され、軸受全体が冷却される。
[Embodiment 2]
Figure 3 is a schematic diagram showing a second embodiment of the manufacturing method for a rolling bearing unit according to the present invention. In order to reduce the thermal effect of the molten metal or molten resin on the rolling bearing 10, it is also possible to use a cooling water circulation pipe 60, which corresponds to the shaft (not shown) inserted into the inner ring of the rolling bearing 10, as shown in Figure 3. By flowing cooling water through this cooling water circulation pipe 60 while pouring the molten metal or molten resin into the cavity 55, the inner ring of the rolling bearing 10 is cooled in order from the rolling elements to the outer ring, thereby cooling the entire bearing.
［実施の形態３］
図４は、本発明に係る転がり軸受ユニットの製造方法の実施の形態３を示す模式図である。金属溶湯又は溶融樹脂による転がり軸受１０への熱的影響を軽減するために、図４に示すように、上金型５０Ａ及び下金型５０Ｂのそれぞれに、転がり軸受１０の内径及び外径に合わせて冷却水流通路７０を設け、冷却水を流通させながら空所５５に金属溶湯又は溶融樹脂を流し込むこともできる。冷却水流通路７０により、転がり軸受１０を側面から冷却することができる。
なお、冷却水流通路７０は、上金型５０Ａ内で流通し、転がり軸受１０の内輪及び外輪の上部を冷却させる、といった形でもよい。更には、下金型５０Ｂ内で流通し、転がり軸受１０の内輪及び外輪の下部を冷却させる、といった形でもよい。
[Third embodiment]
Figure 4 is a schematic diagram showing a third embodiment of the method for manufacturing a rolling bearing unit according to the present invention. In order to reduce the thermal effect of the molten metal or molten resin on the rolling bearing 10, as shown in Figure 4, it is also possible to provide cooling water flow passages 70 in each of the upper mold 50A and the lower mold 50B, aligned with the inner and outer diameters of the rolling bearing 10, and to pour the molten metal or molten resin into the cavity 55 while circulating cooling water. The cooling water flow passages 70 allow the rolling bearing 10 to be cooled from the side.
The cooling water flow passage 70 may be configured to circulate within the upper mold 50A and cool the upper parts of the inner and outer rings of the rolling bearing 10. Furthermore, the cooling water flow passage 70 may be configured to circulate within the lower mold 50B and cool the lower parts of the inner and outer rings of the rolling bearing 10.
また、図示は省略するが、実施の形態２で説明した冷却水流通管６０を併用することもできる。これにより、転がり軸受１０の冷却効果が高まり、熱的影響をより軽減することができる。
また，図４では、上金型及び下金型といったパーティングラインが横向きになるような形で設置しているが、本金型を横向き、すなわちパーティングラインが縦向きになるような形にしても構わない。
Although not shown, the cooling water flow pipe 60 described in the second embodiment can also be used in combination. This increases the cooling effect of the rolling bearing 10, and makes it possible to further reduce the thermal influence.
In addition, in FIG. 4, the upper and lower molds are arranged so that the parting lines are horizontal, but the molds may be arranged horizontally, i.e., so that the parting lines are vertical.
［実施の形態４］
図５は、本発明に係る転がり軸受ユニットの製造方法の実施の形態４を示す模式図である。金属溶湯又は溶融樹脂による転がり軸受１０への熱的影響を軽減するために、図５に示すように、下金型５０Ｂの空所５５を貫通し、更には転がり軸受１０の外輪１１を貫通する潤滑油流通管８０を設け、潤滑油流通管８０を通じて転がり軸受１０の外輪１１と内輪１２との間の空間（軸受空間）に潤滑油を供給しながら、空所５５に金属溶湯又は溶融樹脂を流し込むこともできる。潤滑油が冷媒となり、転がり軸受１０を軸受空間、すなわち内部から冷却することできる。
[Fourth embodiment]
Figure 5 is a schematic diagram showing a fourth embodiment of the method for manufacturing a rolling bearing unit according to the present invention. In order to reduce the thermal effect of the molten metal or molten resin on the rolling bearing 10, as shown in Figure 5, it is possible to provide a lubricating oil circulation pipe 80 that passes through the cavity 55 of the lower mold 50B and further through the outer ring 11 of the rolling bearing 10, and to pour the molten metal or molten resin into the cavity 55 while supplying lubricating oil to the space between the outer ring 11 and inner ring 12 of the rolling bearing 10 (bearing space) through the lubricating oil circulation pipe 80. The lubricating oil acts as a refrigerant, and the rolling bearing 10 can be cooled from the bearing space, i.e., from the inside.
なお、潤滑油流通管８０は、得られる転がり軸受ユニット１において、そのまま転がり軸受１０の給油孔として利用することができる。そのため、製造後に給油孔から新たな潤滑剤を供給し、製造中に冷却媒として使用した潤滑油を転がり軸受１０から流し出すことができる。 The lubricating oil flow pipe 80 can be used as an oil supply port for the rolling bearing 10 in the resulting rolling bearing unit 1. This allows new lubricant to be supplied through the oil supply port after manufacturing, and the lubricating oil used as a coolant during manufacturing to be drained from the rolling bearing 10.
また、実施の形態２や実施の形態３で説明した、冷却水流通管６０や冷却水流通路７０を併用してもよい。 The cooling water flow pipe 60 and cooling water flow passage 70 described in embodiments 2 and 3 may also be used in combination.
［実施の形態５］
図示は省略するが、実施の形態１～３において、転がり軸受１０として、軸受空間にグリースを充填した状態で使用することもできる。グリースが冷却材となって、転がり軸受１０の冷却に寄与する。
Fifth Embodiment
Although not shown in the drawings, in the first to third embodiments, the rolling bearing 10 can also be used with the bearing space filled with grease. The grease acts as a coolant and contributes to cooling the rolling bearing 10.
金属溶湯又は溶融樹脂が凝固するまでは短時間であり、一般的な軸受用グリースであれば、熱分解などを起こさずに十分に耐え得る。 It takes a short time for molten metal or molten resin to solidify, and general bearing grease can withstand this without thermal decomposition.
１ 転がり軸受ユニット
１０ 転がり軸受
１１ 外輪
１２ 内輪
５０Ａ 上金型
５０Ｂ 下金型
５１Ａ 溝
５１Ｂ 溝
５５ 空所
６０ 冷却水流通管
７０ 冷却水流通路
８０ 潤滑油流通管
１００ ハウジング
１０１ 軸受収容部
REFERENCE SIGNS LIST 1 Rolling bearing unit 10 Rolling bearing 11 Outer ring 12 Inner ring 50A Upper die 50B Lower die 51A Groove 51B Groove 55 Cavity 60 Cooling water flow pipe 70 Cooling water flow passage 80 Lubricating oil flow pipe 100 Housing 101 Bearing accommodating portion
Claims (3)
前記転がり軸受をコアとして前記ハウジング用の金型に装着し、
前記転がり軸受の内輪と外輪との間の空間に、前記金型と前記外輪を貫通するように設けられた潤滑油流通管を通じて潤滑油を供給しながら、前記金型に金属溶湯又は溶融樹脂を流し込み、凝固させる、転がり軸受ユニットの製造方法。 A method for manufacturing a rolling bearing unit in which a rolling bearing and a metal or resin housing are integrated, comprising:
The rolling bearing is mounted as a core in a mold for the housing,
a method for manufacturing a rolling bearing unit, comprising: pouring molten metal or molten resin into the mold and allowing it to solidify while supplying lubricating oil to the space between the inner ring and the outer ring of the rolling bearing through a lubricating oil distribution pipe that is provided so as to pass through the mold and the outer ring.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012087917A (en) | 2010-10-22 | 2012-05-10 | Nsk Ltd | Hub unit bearing, method for manufacturing outer member for hub unit bearing |
| JP2015055329A (en) | 2013-09-13 | 2015-03-23 | 三菱電機株式会社 | Resin roller and manufacturing method thereof |
| JP2022041476A (en) | 2020-09-01 | 2022-03-11 | 株式会社Ihi | Supercharger |
| JP2022092094A (en) | 2020-12-10 | 2022-06-22 | 日本精工株式会社 | Worm reduction gear |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012087917A (en) | 2010-10-22 | 2012-05-10 | Nsk Ltd | Hub unit bearing, method for manufacturing outer member for hub unit bearing |
| JP2015055329A (en) | 2013-09-13 | 2015-03-23 | 三菱電機株式会社 | Resin roller and manufacturing method thereof |
| JP2022041476A (en) | 2020-09-01 | 2022-03-11 | 株式会社Ihi | Supercharger |
| JP2022092094A (en) | 2020-12-10 | 2022-06-22 | 日本精工株式会社 | Worm reduction gear |
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