JP2018087604A - Rolling bearing - Google Patents

Rolling bearing Download PDF

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Publication number
JP2018087604A
JP2018087604A JP2016231326A JP2016231326A JP2018087604A JP 2018087604 A JP2018087604 A JP 2018087604A JP 2016231326 A JP2016231326 A JP 2016231326A JP 2016231326 A JP2016231326 A JP 2016231326A JP 2018087604 A JP2018087604 A JP 2018087604A
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JP
Japan
Prior art keywords
outer ring
hole
pin
rolling bearing
inner periphery
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Pending
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JP2016231326A
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Japanese (ja)
Inventor
隆道 原田
Takamichi Harada
隆道 原田
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Application filed by NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Priority to JP2016231326A priority Critical patent/JP2018087604A/en
Priority to PCT/JP2017/041054 priority patent/WO2018101038A1/en
Priority to GB1907945.8A priority patent/GB2571474B/en
Publication of JP2018087604A publication Critical patent/JP2018087604A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/07—Fixing them on the shaft or housing with interposition of an element
    • F16C35/077—Fixing them on the shaft or housing with interposition of an element between housing and outer race ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/44—Needle bearings
    • F16C19/46—Needle bearings with one row or needles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/44—Needle bearings
    • F16C19/46—Needle bearings with one row or needles
    • F16C19/466—Needle bearings with one row or needles comprising needle rollers and an outer ring, i.e. subunit without inner ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F16C33/586—Details of specific parts of races outside the space between the races, e.g. end faces or bore of inner ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
    • F16C9/02—Crankshaft bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/10—Force connections, e.g. clamping
    • F16C2226/12—Force connections, e.g. clamping by press-fit, e.g. plug-in
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/70—Diameters; Radii

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing which can prevent damage of an outer ring.SOLUTION: A rolling bearing includes: an outer ring 1 which fits in a housing 30 and has an outer ring hole 5 allowing communication between an inner periphery and an outer periphery; multiple needle rollers 3 which are disposed along a raceway surface 2 of the outer ring 1 so as to roll; a retainer 4 which retains the needle rollers 3 at an interval in a circumferential direction; and a pin 6 which is fixed to the outer ring hole 5 of the outer ring 1 by interference fit. The outer ring hole 5 has: a fitting hole part 8 located at the radial outer side of the outer ring 1 and in which the pin 6 is fitted; a communication hole part 9 communicating with the fitting hole part 8; and a step part 10 formed between an inner periphery of the fitting hole part 8 and an inner periphery of the communication hole part 9. The pin 6 engages with the housing 30 in a state where the pin 6 is supported by the step part 10.SELECTED DRAWING: Figure 1

Description

本発明は、ハウジングに対して外輪が回り止めされた転がり軸受に関する。   The present invention relates to a rolling bearing in which an outer ring is prevented from rotating with respect to a housing.

自動車等のクランクケース内には、転がり軸受により回転可能に支持されるクランク軸が組み込まれている。この転がり軸受は、クランクケースに一体化したハウジングに嵌合された状態で、高温環境下で使用されている。   A crankshaft that is rotatably supported by a rolling bearing is incorporated in a crankcase of an automobile or the like. This rolling bearing is used in a high temperature environment in a state of being fitted to a housing integrated with a crankcase.

このような高温環境下では、転がり軸受の外輪の素材である軸受鋼などの鋼素材と、ハウジングの素材であるアルミニウム材との線膨張係数の差によって、外輪とハウジングの嵌合孔との間の嵌め合い隙間が大きくなり、転がり軸受とハウジングの嵌合孔との間で周方向への相対的なずれ（以下、「クリープ」という）が生じることがある。   Under such a high temperature environment, there is a difference in coefficient of linear expansion between the steel material such as the bearing steel that is the material of the outer ring of the rolling bearing and the aluminum material that is the material of the housing, so that there is a gap between the outer ring and the fitting hole of the housing. In some cases, a relative gap in the circumferential direction (hereinafter referred to as “creep”) may occur between the rolling bearing and the fitting hole of the housing.

前記クリープを防止するために、特許文献１に記載された転がり軸受が知られている。この文献に記載された転がり軸受は、外輪の外周に径方向に窪む外輪穴と、その外輪穴に圧入固定される円柱状のピンとを有している。   In order to prevent the creep, a rolling bearing described in Patent Document 1 is known. The rolling bearing described in this document has an outer ring hole that is recessed in the radial direction on the outer periphery of the outer ring, and a cylindrical pin that is press-fitted and fixed in the outer ring hole.

このピンが、ハウジングの内周に径方向に窪み、外輪穴に連続して形成されるハウジング穴及び外輪の外輪穴に圧入されることにより、ハウジングに嵌合される転がり軸受の外輪とハウジングとの間のクリープを防止している。   The pin is recessed in the radial direction on the inner periphery of the housing and press-fitted into a housing hole formed continuously with the outer ring hole and an outer ring hole of the outer ring, whereby the outer ring and the housing of the rolling bearing fitted into the housing Prevents creep during

特開２０１４−１０５７３２号公報JP 2014-105732 A

ところで、特許文献１に記載された転がり軸受において、外輪の外周に外輪穴を設けるには、通常、外輪の径方向の厚さ（肉厚）を大きくして、強度を確保する必要がある。しかしながら、ハウジング内での転がり軸受の嵌合スペースに制約があると、外輪の肉厚を厚くすることが難しい場合があった。   By the way, in the rolling bearing described in Patent Document 1, in order to provide the outer ring hole on the outer periphery of the outer ring, it is usually necessary to increase the radial thickness (wall thickness) of the outer ring to ensure the strength. However, when the fitting space of the rolling bearing in the housing is limited, it may be difficult to increase the thickness of the outer ring.

また、外輪穴に対してピンを確実に圧入固定するには、ピンの外輪穴への圧入長さを長くして対応することが考えられる。しかし、外輪穴の圧入長さを長くすれば、上述したように、外輪の肉厚を厚くすることが難しい場合、外輪穴の穴底面と外輪の内径面との間での外輪の肉厚が薄くなる。   In order to securely press-fit the pin into the outer ring hole, it is conceivable to increase the press-fit length of the pin into the outer ring hole. However, if it is difficult to increase the thickness of the outer ring by increasing the press-fitting length of the outer ring hole, as described above, the thickness of the outer ring between the bottom surface of the outer ring hole and the inner surface of the outer ring is reduced. getting thin.

外輪の肉厚が薄いと、ピンの圧入の際、ピンにより、外輪穴の内部の空気が圧縮されて外輪穴の内圧が高まり、外輪穴の底部分が抜けて外輪が損傷する恐れがあるという問題があった。   If the outer ring is thin, the pin may compress the air inside the outer ring hole and increase the inner pressure of the outer ring hole, and the bottom part of the outer ring hole may fall out and damage the outer ring. There was a problem.

また、加工時や洗浄時に使用された油が外輪穴の内部に残留している場合も、ピンの圧入によって、油が圧縮されて外輪穴の内圧が高まり、この場合でも、外輪穴の底部分が抜けて外輪が損傷する恐れがあるという問題があった。   Also, if the oil used during processing or cleaning remains inside the outer ring hole, the pressure of the pin is pressed into the oil to increase the inner pressure of the outer ring hole. There was a problem that the outer ring could be damaged due to falling off.

そこで、この発明の課題は、外輪の損傷を防止することができる転がり軸受を提供することにある。   Then, the subject of this invention is providing the rolling bearing which can prevent the damage of an outer ring | wheel.

上記の課題を解決するために、この発明は、ハウジングに嵌合される外輪と、その外輪の軌道面に沿って転動可能に配置される複数の転動体と、その転動体を周方向に間隔をおいて保持する保持器と、前記外輪に固定されるピンとを備え、前記外輪は、その内周と外周とを連通する外輪孔を有し、前記ピンは、前記外輪孔に締まり嵌めにより固定され、前記外輪の外周から突出する状態で前記ハウジングに係合する構成を採用することできる。   In order to solve the above-described problems, the present invention provides an outer ring fitted in a housing, a plurality of rolling elements arranged to roll along the raceway surface of the outer ring, and the rolling elements in the circumferential direction. A cage that is held at an interval; and a pin that is fixed to the outer ring. The outer ring has an outer ring hole that communicates an inner periphery and an outer periphery thereof, and the pin is fitted into the outer ring hole by an interference fit. A structure that is fixed and engages with the housing in a state of protruding from the outer periphery of the outer ring can be employed.

この構成によると、外輪孔は外輪の内周と外周とを連通するので、ピンが締まり嵌めする際、外輪孔の内部での空気や油などの流体の圧縮がされない。   According to this configuration, the outer ring hole communicates the inner periphery and the outer periphery of the outer ring, so that when the pin is tightly fitted, fluid such as air or oil is not compressed inside the outer ring hole.

前記外輪孔は、前記外輪の径方向外側に位置し、前記ピンが嵌合される嵌合孔部と、その嵌合孔部に連通する連通孔部と、前記嵌合孔部の内周と連通孔部の内周との間に形成される段差部とを有し、前記ピンが前記段差部で支持されている構成を採用することができる。   The outer ring hole is located on the radially outer side of the outer ring, and a fitting hole part into which the pin is fitted, a communication hole part communicating with the fitting hole part, and an inner periphery of the fitting hole part It is possible to employ a configuration in which a step portion is formed between the inner periphery of the communication hole portion and the pin is supported by the step portion.

この構成では、外輪孔に締まり嵌めされるピンが段差部により支持されるので、ピンが外輪の内周から突出することを防止することができる。   In this configuration, since the pin that is tightly fitted in the outer ring hole is supported by the step portion, it is possible to prevent the pin from protruding from the inner periphery of the outer ring.

この構成において、前記段差部が前記嵌合孔部の内周から前記連通孔部の内周へ向かって、前記外輪の径方向内向きに傾斜するテーパ状をなしている構成を採用することができる。この構成では、外輪孔に締まり嵌めされたピンによって、嵌合孔部の内周と段差部との境界部分に負荷される応力が緩和される。   In this configuration, it is possible to employ a configuration in which the stepped portion has a tapered shape that is inclined inward in the radial direction of the outer ring from the inner periphery of the fitting hole portion toward the inner periphery of the communication hole portion. it can. In this configuration, the stress applied to the boundary portion between the inner periphery of the fitting hole and the stepped portion is relieved by the pin that is tightly fitted in the outer ring hole.

前記外輪孔の連通孔部は、前記外輪の軌道面に開口している構成を採用することができる。この構成によると、外輪は外輪孔に対して軸方向両側の肉厚が確保されるので、ピンを締まり嵌めする際、外輪孔の周囲に負荷される応力による外輪の割れが防止される。   The communication hole portion of the outer ring hole may employ a configuration that opens to the raceway surface of the outer ring. According to this configuration, since the outer ring has a thickness on both sides in the axial direction with respect to the outer ring hole, the outer ring is prevented from cracking due to the stress applied around the outer ring hole when the pin is tightly fitted.

前記転動体が針状ころであり、前記連通孔部が断面円形をなしており、その連通孔部の孔径寸法が、前記針状ころの外径寸法の１／２よりも小さくなっている構成を採用することができる。   The rolling element is a needle roller, the communication hole has a circular cross section, and the hole diameter of the communication hole is smaller than ½ of the outer diameter of the needle roller. Can be adopted.

連通孔部の孔径寸法が針状ころの外径寸法の１／２よりも小さくすることで、転がり軸受の運転時において、外輪の軌道面と針状ころとの接触面圧を低くし、転がり軸受の寿命低下を改善することができる。   By making the hole diameter of the communication hole smaller than 1/2 of the outer diameter of the needle roller, the contact surface pressure between the raceway surface of the outer ring and the needle roller is lowered during the operation of the rolling bearing, thereby rolling the roller. The life reduction of the bearing can be improved.

この発明は、外輪孔は外輪の内周と外周とを連通するので、ピンが締まり嵌めする際、外輪孔の内部での空気や油などの流体の圧縮がされず、外輪孔の内圧の上昇により外輪が破損しない。   In this invention, since the outer ring hole communicates the inner periphery and the outer periphery of the outer ring, when the pin is tightly fitted, fluid such as air or oil is not compressed in the outer ring hole, and the inner pressure of the outer ring hole is increased. Does not damage the outer ring.

この発明に係る転がり軸受を示す縦断面図A longitudinal sectional view showing a rolling bearing according to the present invention 同上の転がり軸受の要部を示す縦断面図Longitudinal sectional view showing the main parts of the same rolling bearing 同上の転がり軸受とハウジングとの嵌合を示す断面図Sectional drawing which shows fitting with a rolling bearing same as the above and a housing 同上の転がり軸受とハウジングとの嵌合の要部を示す外形図Outline drawing showing the main part of the fitting between the rolling bearing and the housing

以下、この発明の実施形態を図面に基づいて説明する。この発明の実施形態の転がり軸受２０は、クランクケース（図示省略）内に組み込まれるクランク軸（図示省略）を回転可能に支持し、クランクケースに一体化したハウジング３０内に嵌合されている。   Embodiments of the present invention will be described below with reference to the drawings. The rolling bearing 20 according to the embodiment of the present invention rotatably supports a crankshaft (not shown) incorporated in a crankcase (not shown) and is fitted in a housing 30 integrated with the crankcase.

この実施形態の転がり軸受２０は、図１に示すように、ハウジング３０内に嵌め合わされ、内周面に軌道面２を有する外輪１と、外輪１の軌道面２に沿って転動可能に配置される転動体である複数の針状ころ３と、複数の針状ころ３を周方向に間隔をおいて保持する保持器４と、外輪１に形成される径方向の外輪孔５に締まり嵌めにより固定されるピン６とを備えている。ここで、ピン６を備える転がり軸受２０において、外輪１の肉厚は、３．５ｍｍ〜５.０ｍｍの間で設定されており、薄肉である。外輪１の肉厚は、少なくとも３．５ｍｍ以上に設定されていることが好ましい。具体的には、転がり軸受２０の外径が４０ｍｍ以上の場合は、外輪１の肉厚は３．５ｍｍ以上かつ当該外径の１/１０以下に設定されていることが好ましく、転がり軸受２０の外径が４０ｍｍ未満の場合は、３．５ｍｍ〜５.０ｍｍの間に設定されていることが好ましい。   As shown in FIG. 1, the rolling bearing 20 of this embodiment is fitted in a housing 30, and is arranged so as to be able to roll along the outer race 1 having the raceway surface 2 on the inner peripheral surface and the raceway surface 2 of the outer race 1. A plurality of needle rollers 3 that are rolling elements, a retainer 4 that holds the needle rollers 3 at intervals in the circumferential direction, and a radial outer ring hole 5 formed in the outer ring 1. And a pin 6 fixed by the. Here, in the rolling bearing 20 provided with the pin 6, the outer ring 1 has a thin wall thickness set between 3.5 mm and 5.0 mm. The wall thickness of the outer ring 1 is preferably set to at least 3.5 mm or more. Specifically, when the outer diameter of the rolling bearing 20 is 40 mm or more, the thickness of the outer ring 1 is preferably set to 3.5 mm or more and 1/10 or less of the outer diameter. When the outer diameter is less than 40 mm, it is preferably set between 3.5 mm and 5.0 mm.

ハウジング３０は、図３、４に示すように、転がり軸受２０の周方向において、外輪１の外輪孔５を含む位置を割り面３１として二分割される分割ハウジング３２、３３から構成される。ハウジング３０は、分割ハウジング３２、３３に跨って形成される嵌合凹部３４およびピン孔３５を有する。   As shown in FIGS. 3 and 4, the housing 30 includes divided housings 32 and 33 that are divided into two with a position including the outer ring hole 5 of the outer ring 1 as a split surface 31 in the circumferential direction of the rolling bearing 20. The housing 30 has a fitting recess 34 and a pin hole 35 formed across the divided housings 32 and 33.

ハウジング３０は、嵌合凹部３４に転がり軸受２０の外輪１が嵌合されており、ピン孔３５に外輪孔５に締まり嵌めにより固定されるピン６が係合している。ハウジング３０の素材は、クランクケースと同じ素材、例えば、アルミニウム合金を適用可能である。   In the housing 30, the outer ring 1 of the rolling bearing 20 is fitted in the fitting recess 34, and the pin 6 fixed to the outer ring hole 5 by interference fitting is engaged with the pin hole 35. The material of the housing 30 can be the same material as the crankcase, for example, an aluminum alloy.

図１に示すように、外輪１は、軌道面２の軸方向両端に鍔部７、７を有し、外輪１の外周部には、径方向内側に向かって凹む外輪孔５が形成されている。図２に示すように、軌道面２の軸方向両側部には逃げ溝２ａが形成されている。この外輪１は、例えば、鋼管などを旋削加工したソリッド形であることが好ましく、鋼板をプレス加工したプレス成形品としてもよい。   As shown in FIG. 1, the outer ring 1 has flanges 7 and 7 at both ends in the axial direction of the raceway surface 2, and an outer ring hole 5 that is recessed radially inward is formed in the outer peripheral part of the outer ring 1. Yes. As shown in FIG. 2, relief grooves 2 a are formed on both axial sides of the raceway surface 2. The outer ring 1 is preferably, for example, a solid shape obtained by turning a steel pipe or the like, and may be a press-formed product obtained by pressing a steel plate.

外輪孔５は、外輪１の軸方向中間部に形成され、外輪１の内周と外周とを連通する。外輪孔５は、図２に示すように、外輪１の径方向外側に位置する嵌合孔部８と、外輪１の径方向内側に位置し、嵌合孔部８に連通する連通孔部９とを有する。   The outer ring hole 5 is formed at an intermediate portion in the axial direction of the outer ring 1 and communicates the inner periphery and the outer periphery of the outer ring 1. As shown in FIG. 2, the outer ring hole 5 includes a fitting hole portion 8 positioned on the radially outer side of the outer ring 1 and a communication hole portion 9 positioned on the radially inner side of the outer ring 1 and communicating with the fitting hole portion 8. And have.

嵌合孔部８は、内周面が円筒面となる断面円形をなしており、その外輪１の外周に形成された開口部８ａが外輪１の径方向外側に向かって孔径寸法が大きくなるテーパ状をなしている。嵌合孔部８は、孔径寸法ｄ１がピン６の外径寸法ｄ２よりもわずかに小さく、ピン６が締まり嵌めにより固定される。   The fitting hole 8 has a circular cross section whose inner peripheral surface is a cylindrical surface, and an opening 8a formed on the outer periphery of the outer ring 1 is a taper whose hole diameter increases toward the radially outer side of the outer ring 1. It has a shape. The fitting hole 8 has a hole diameter d1 slightly smaller than the outer diameter d2 of the pin 6, and the pin 6 is fixed by an interference fit.

なお、嵌合孔部８は、その形状が断面円形に限られず、ピン６の断面形状に応じた形状としてもよい。この場合、嵌合孔部８は、その内周面の全周にピン６の外周面の全周が接触する状態で、ピン６が締まり嵌めされる断面形状であればよい。   In addition, the shape of the fitting hole 8 is not limited to a circular cross section, and may be a shape corresponding to the cross sectional shape of the pin 6. In this case, the fitting hole 8 may have a cross-sectional shape in which the pin 6 is tightly fitted in a state where the entire circumference of the outer peripheral surface of the pin 6 is in contact with the entire circumference of the inner peripheral surface.

連通孔部９は、内周面が円筒面となる断面円形をなしており、外輪１の軌道面２に開口している。連通孔部９は、その中心軸が嵌合孔部８の中心軸と一致し、嵌合孔部８の孔径寸法ｄ１よりも小さい孔径寸法ｄ３を有している。なお、連通孔部９は、嵌合孔部８に連通し、かつ外輪１の軌道面２に開口するものであればよく、断面円形に限られない。   The communication hole portion 9 has a circular cross section whose inner peripheral surface is a cylindrical surface, and is open to the raceway surface 2 of the outer ring 1. The communication hole portion 9 has a center axis that coincides with the center axis of the fitting hole portion 8, and has a hole diameter dimension d 3 that is smaller than the hole diameter dimension d 1 of the fitting hole portion 8. The communication hole 9 is not limited to a circular shape as long as it communicates with the fitting hole 8 and opens to the raceway surface 2 of the outer ring 1.

連通孔部９の孔径寸法ｄ３は、針状ころ３の外径寸法ｄ４の１／２よりも小さく設定されている。連通孔部９の孔径寸法ｄ３を針状ころ３の外径寸法ｄ４の１／２よりも小さくすることで、転がり軸受２０の運転時において、外輪１の軌道面２と針状ころ３との接触面圧を低くし、転がり軸受２０の寿命低下を改善することができる。   The hole diameter d3 of the communication hole 9 is set to be smaller than ½ of the outer diameter d4 of the needle roller 3. By making the hole diameter d3 of the communication hole 9 smaller than ½ of the outer diameter d4 of the needle roller 3, the raceway surface 2 of the outer ring 1 and the needle roller 3 are in operation during the operation of the rolling bearing 20. A contact surface pressure can be made low and the lifetime reduction of the rolling bearing 20 can be improved.

外輪孔５の嵌合孔部８の内周と連通孔部９の内周との間には段差部１０が形成されている。段差部１０は、嵌合孔部８の内周から連通孔部９の内周へ向かって、外輪１の径方向内向きに傾斜するテーパ状をなしている。段差部１０は、外輪孔５に締まり嵌めするピン６の端部が突き当たり、そのピン６を支持している。   A step portion 10 is formed between the inner periphery of the fitting hole portion 8 of the outer ring hole 5 and the inner periphery of the communication hole portion 9. The step portion 10 has a taper shape that is inclined inward in the radial direction of the outer ring 1 from the inner periphery of the fitting hole portion 8 toward the inner periphery of the communication hole portion 9. In the stepped portion 10, the end portion of the pin 6 that is tightly fitted in the outer ring hole 5 abuts and supports the pin 6.

段差部１０はそのピン６を支持可能であれば、必ずしもテーパ状である必要はないが、テーパ状であれば、外輪孔５に締まり嵌めされたピン６によって、嵌合孔部８の内周と段差部１０との境界部分に負荷される応力が緩和される。   The stepped portion 10 does not necessarily need to be tapered as long as the pin 6 can be supported. However, if the stepped portion 10 is tapered, the inner periphery of the fitting hole portion 8 is secured by the pin 6 that is tightly fitted to the outer ring hole 5. The stress applied to the boundary portion between the step portion 10 and the step portion 10 is alleviated.

なお、外輪孔５は、ピン６が締まり嵌めにより固定されるものであれば、段差部１０を形成せずに、例えば、内周面が円筒面であるものとすることができる。この実施形態のように外輪孔５が段差部１０を有すれば、ピン６が段差部１０で支持され、ピン６の外輪１の軌道面２からの突出が防止されるので好ましい。   If the pin 6 is fixed by interference fitting, the outer ring hole 5 can be formed with, for example, an inner peripheral surface of a cylindrical surface without forming the stepped portion 10. If the outer ring hole 5 has the step part 10 as in this embodiment, the pin 6 is supported by the step part 10, and the protrusion of the pin 6 from the raceway surface 2 of the outer ring 1 is prevented.

保持器４は、軸方向に間隔を開けて設けられた円環状の一対のリム部１１と、一対のリム部１１、１１間に周方向に間隔をおいて配置された複数の柱部１２とを有し、周方向に隣り合う柱部１２、１２の間にポケット１３がそれぞれ形成されている。また、保持器４は、一対のリム部１１、１１の外周面が一対の鍔部７、７の内周面と対向して、外輪案内されている。   The cage 4 includes a pair of annular rim portions 11 provided at intervals in the axial direction, and a plurality of column portions 12 disposed between the pair of rim portions 11 and 11 at intervals in the circumferential direction. And pockets 13 are formed between the column portions 12 and 12 adjacent to each other in the circumferential direction. The cage 4 is guided by the outer ring with the outer peripheral surfaces of the pair of rim portions 11, 11 facing the inner peripheral surfaces of the pair of flange portions 7, 7.

柱部１２の径方向内面は、針状ころ３のピッチ円径（ＰＣＤ）よりも径方向内側に位置している（図４中の一点鎖線参照）。   The inner surface in the radial direction of the column portion 12 is located on the inner side in the radial direction with respect to the pitch circle diameter (PCD) of the needle rollers 3 (see the one-dot chain line in FIG. 4).

また、保持器４は、合成樹脂の射出成形品や、鋼板のプレス加工によるプレス成形品とされる。ポケット１３のそれぞれに針状ころ３が圧入され、ポケット１３内に針状ころ３が保持されている。   The cage 4 is a synthetic resin injection-molded product or a press-molded product by pressing a steel plate. The needle rollers 3 are press-fitted into the pockets 13, and the needle rollers 3 are held in the pockets 13.

ピン６は、金属製の円柱体であり、その両端部の全周に面取り部６ａを有する。ピン６は、外輪１の外輪孔５に締まり嵌めされ段差部１０に支持された状態で、外輪１の外周面から突出する長さを有する。   The pin 6 is a metal cylinder, and has a chamfered portion 6a on the entire circumference of both end portions thereof. The pin 6 has a length projecting from the outer peripheral surface of the outer ring 1 in a state in which the pin 6 is fitted in the outer ring hole 5 of the outer ring 1 and supported by the step portion 10.

ピン６は、図４に示すように、ハウジング３０のピン孔３５にすきま嵌めされた状態で、ハウジング３０に係合している。この係合により、転がり軸受２０とハウジング３０との間のクリープが防止される。   As shown in FIG. 4, the pin 6 is engaged with the housing 30 in a state of being fitted in the pin hole 35 of the housing 30. By this engagement, creep between the rolling bearing 20 and the housing 30 is prevented.

この実施形態の転がり軸受２０は、このように構成され、外輪１に形成された外輪孔５が外輪１の外周と内周とを連通している。このため、ピン６が外輪孔５に締まり嵌めされる際、外輪孔５の内部において、空気や油などの流体が圧縮されることがない。したがって、従来の転がり軸受のように外輪穴の内圧が高まり、外輪穴の底部分が抜けて外輪が損傷することはない。   The rolling bearing 20 of this embodiment is configured as described above, and the outer ring hole 5 formed in the outer ring 1 communicates the outer periphery and the inner periphery of the outer ring 1. For this reason, when the pin 6 is tightly fitted into the outer ring hole 5, fluid such as air or oil is not compressed inside the outer ring hole 5. Therefore, unlike the conventional rolling bearing, the inner pressure of the outer ring hole is increased, and the bottom part of the outer ring hole is not removed and the outer ring is not damaged.

また、外輪孔５は段差部１０を有し、その段差部１０にピン６の嵌合側端部が支持されるので、嵌合孔部８に締まり嵌めされたピン６が外輪１の軌道面２から突出することを防止される。   Further, the outer ring hole 5 has a stepped portion 10, and the fitting side end of the pin 6 is supported by the stepped portion 10, so that the pin 6 tightly fitted into the fitting hole 8 is the raceway surface of the outer ring 1. Protruding from 2 is prevented.

外輪孔５は、外輪１の軸方向中間部に形成され、連通孔部９が外輪１の軌道面２に開口している。これにより、外輪孔５に対して、外輪１の軸方向肉厚が確保されて、ピン６を締まり嵌めする際、外輪孔５の周囲に負荷される応力による外輪１の割れが防止される。   The outer ring hole 5 is formed in an intermediate portion in the axial direction of the outer ring 1, and the communication hole portion 9 opens in the raceway surface 2 of the outer ring 1. Thereby, the axial thickness of the outer ring 1 is ensured with respect to the outer ring hole 5, and cracking of the outer ring 1 due to stress applied around the outer ring hole 5 when the pin 6 is tightly fitted is prevented.

外輪孔５の段差部１０は、嵌合孔部８の内周から連通孔部９の内周へ向かって、外輪１の径方向内向きに傾斜するテーパ状をなしている。これにより、外輪孔５に締まり嵌めされたピン６によって、嵌合孔部８の内周と段差部１０との境界部分に負荷される応力が緩和される。   The step portion 10 of the outer ring hole 5 has a tapered shape that is inclined inward in the radial direction of the outer ring 1 from the inner periphery of the fitting hole portion 8 toward the inner periphery of the communication hole portion 9. Accordingly, the stress applied to the boundary portion between the inner periphery of the fitting hole portion 8 and the stepped portion 10 is relieved by the pin 6 that is tightly fitted in the outer ring hole 5.

１ 外輪
２ 軌道面
２ａ 逃げ溝
３ 針状ころ
４ 保持器
５ 外輪孔
６ ピン
６ａ 面取り部
７ 鍔部
８ 嵌合孔部
８ａ 開口部
９ 連通孔部
１０ 段差部
１１ リム部
１２ 柱部
１３ ポケット
２０ 転がり軸受
３０ ハウジング
３１ 割り面
３２、３３ 分割ハウジング
３４ 嵌合凹部
３５ ピン孔
ｄ１、ｄ３ 孔径寸法
ｄ２、ｄ４ 外径寸法 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Raceway surface 2a Escape groove 3 Needle roller 4 Cage 5 Outer ring hole 6 Pin 6a Chamfered part 7 Gutter part 8 Fitting hole part 8a Opening part 9 Communication hole part 10 Step part 11 Rim part 12 Column part 13 Pocket 20 Rolling bearing 30 Housing 31 Split surfaces 32, 33 Split housing 34 Fitting recess 35 Pin holes d1, d3 Hole diameter dimensions d2, d4 Outer diameter dimensions

Claims (5)

ハウジングに嵌合される外輪と、その外輪の軌道面に沿って転動可能に配置される複数の転動体と、その転動体を周方向に間隔をおいて保持する保持器と、前記外輪に固定されるピンとを備え、
前記外輪は、その内周と外周とを連通する外輪孔を有し、前記ピンは、前記外輪孔に締まり嵌めにより固定され、前記外輪の外周から突出する状態で前記ハウジングに係合する転がり軸受。 An outer ring fitted into the housing, a plurality of rolling elements arranged to roll along the raceway surface of the outer ring, a cage for holding the rolling elements at intervals in the circumferential direction, and the outer ring With fixed pins,
The outer ring has an outer ring hole that communicates an inner periphery and an outer periphery thereof, and the pin is fixed to the outer ring hole by an interference fit, and is a rolling bearing that engages the housing in a state of protruding from the outer periphery of the outer ring. . 前記外輪孔は、前記外輪の径方向外側に位置し、前記ピンが嵌合される嵌合孔部と、その嵌合孔部に連通する連通孔部と、前記嵌合孔部の内周と連通孔部の内周との間に形成される段差部とを有し、前記ピンが前記段差部で支持されている請求項１に記載された転がり軸受。   The outer ring hole is located on the radially outer side of the outer ring, and a fitting hole part into which the pin is fitted, a communication hole part communicating with the fitting hole part, and an inner periphery of the fitting hole part The rolling bearing according to claim 1, further comprising a step portion formed between the inner periphery of the communication hole portion and the pin being supported by the step portion. 前記段差部が前記嵌合孔部の内周から前記連通孔部の内周へ向かって、前記外輪の径方向内向きに傾斜するテーパ状をなしている請求項２に記載された転がり軸受。   The rolling bearing according to claim 2, wherein the stepped portion has a tapered shape that is inclined inward in the radial direction of the outer ring from the inner periphery of the fitting hole portion toward the inner periphery of the communication hole portion. 前記外輪孔の連通孔部は、前記外輪の軌道面に開口している請求項２または３に記載された転がり軸受。   The rolling bearing according to claim 2 or 3, wherein the communication hole portion of the outer ring hole is open to a raceway surface of the outer ring. 前記転動体が針状ころであり、前記連通孔部が断面円形をなしており、その連通孔部の孔径寸法が前記針状ころの外径寸法の１／２よりも小さくなっている請求項２〜４のいずれかに記載された転がり軸受。   The rolling element is a needle roller, the communication hole has a circular cross section, and the hole diameter of the communication hole is smaller than ½ of the outer diameter of the needle roller. The rolling bearing described in any one of 2-4.
JP2016231326A 2016-11-29 2016-11-29 Rolling bearing Pending JP2018087604A (en)

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