JP2020143708A - Thrust bearing - Google Patents

Thrust bearing Download PDF

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Publication number
JP2020143708A
JP2020143708A JP2019039529A JP2019039529A JP2020143708A JP 2020143708 A JP2020143708 A JP 2020143708A JP 2019039529 A JP2019039529 A JP 2019039529A JP 2019039529 A JP2019039529 A JP 2019039529A JP 2020143708 A JP2020143708 A JP 2020143708A
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Prior art keywords
thrust bearing
lip
track board
housing
seal portion
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JP2019039529A
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JP7270416B2 (en
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浩樹 谷村
Hiroki Tanimura
浩樹 谷村
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2019039529A priority Critical patent/JP7270416B2/en
Priority to PCT/JP2020/007958 priority patent/WO2020179598A1/en
Publication of JP2020143708A publication Critical patent/JP2020143708A/en
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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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Sealing Of Bearings (AREA)

Abstract

To provide a thrust bearing capable of being easily assembled while securing sealability.SOLUTION: The thrust bearing is provided in which balls 5 are interposed between a raceway groove 3 of a shaft bearing washer 1 and a raceway groove 4 of a housing bearing washer 2, a case 6 is fitted onto the shaft bearing washer 1, and the case 6 has an annular end surface portion 7 covering a back surface of the shaft bearing washer 1, a cylindrical peripheral wall portion 8 fitted onto the shaft bearing washer 1, and a caulked portion 9 formed in a peripheral edge portion of the peripheral wall portion 8. A chamfer portion 2a is formed on a back surface side of an outer circumferential surface of the housing bearing washer 2, the end surface portion 7 of the case 6 has a first seal portion 10 in contact with the back surface of the shaft bearing washer 1, and the caulked portion 9 has a second seal portion 12 in slidable contact with the chamber portion 2a of the housing bearing washer 2.SELECTED DRAWING: Figure 1

Description

本発明は、自動車、フォークリフト等のサスペンション、ステアリング等に用いられるキングピン用のスラスト軸受に関する。 The present invention relates to thrust bearings for kingpins used for suspensions of automobiles, forklifts and the like, steering and the like.

従来、自動車、フォークリフト等のサスペンション、ステアリング等に用いられるキングピン部には、キングピンから負荷されるスラスト荷重を受け、このキングピンをキングピン軸に対して回転可能に支持するスラスト軸受が適用されている（例えば、特許文献１の図４参照）。 Conventionally, a thrust bearing that receives a thrust load applied from a kingpin and rotatably supports the kingpin with respect to the kingpin shaft is applied to a kingpin portion used for suspensions of automobiles, forklifts, steering, etc. ( For example, see FIG. 4 of Patent Document 1).

このスラスト軸受は、図７に示すように、軸軌道盤２１の軌道溝２３とハウジング軌道盤２２の軌道溝２４との間に玉２５を介在し、軸軌道盤２１に端面２７と周壁２８からなるケース２６を嵌め合わせたものである。 As shown in FIG. 7, in this thrust bearing, a ball 25 is interposed between the raceway groove 23 of the shaft race disc 21 and the raceway groove 24 of the housing racetrack 22, and the shaft race disc 21 is formed from the end face 27 and the peripheral wall 28. This is a case 26 fitted together.

ケース２６は、端面２７により軸軌道盤２１の背面をカバーし、周壁２８により軸軌道盤２１およびハウジング軌道盤２２の外周面をカバーする。ハウジング軌道盤２２は、周壁２８との間で相対回転が可能となるわずかなすき間が形成される。ハウジング軌道盤２２の外径面とケース２６の周壁２８との間にシール部材３０が介在する。 In the case 26, the end surface 27 covers the back surface of the shaft track board 21, and the peripheral wall 28 covers the outer peripheral surfaces of the shaft track board 21 and the housing track board 22. The housing track board 22 is formed with a slight gap that allows relative rotation with the peripheral wall 28. A seal member 30 is interposed between the outer diameter surface of the housing track board 22 and the peripheral wall 28 of the case 26.

シール部材３０は、環状の芯金３１の外径面にシール用弾性体３２をモールドしたものである。芯金３１は、両端部にＬ形屈曲部３１ａと逆Ｌ形屈曲部３１ｂを有するものである。シール用弾性体３２は、ラジアル方向に突き出たリップ３２ａと、アキシアル方向に突き出た凸部３２ｂを有する。芯金３１のＬ形屈曲部３１ａがハウジング軌道盤２２の外径面に形成された段部２２ａに係合される。 The seal member 30 is formed by molding an elastic body 32 for sealing on the outer diameter surface of the annular core metal 31. The core metal 31 has an L-shaped bent portion 31a and an inverted L-shaped bent portion 31b at both ends. The sealing elastic body 32 has a lip 32a protruding in the radial direction and a convex portion 32b protruding in the axial direction. The L-shaped bent portion 31a of the core metal 31 is engaged with the step portion 22a formed on the outer diameter surface of the housing track board 22.

ケース２６の周壁２８にリップ３２ａが摺接しており、その周壁２８の周縁部に設けたカシメ部２９が、シール用弾性体３２と非接触状態に加締められている。ケース２６のカシメ部２９により、軸軌道盤２１とハウジング軌道盤２２とが相対回転可能に、軸軌道盤２１、ハウジング軌道盤２２および玉２５が一体化される。 The lip 32a is in sliding contact with the peripheral wall 28 of the case 26, and the crimped portion 29 provided on the peripheral edge of the peripheral wall 28 is crimped in a non-contact state with the elastic body 32 for sealing. The caulking portion 29 of the case 26 allows the shaft track board 21 and the housing track board 22 to rotate relative to each other, and the shaft track board 21, the housing track board 22, and the ball 25 are integrated.

また、上記スラスト軸受は、軸軌道盤２１の内径面の背面側コーナー部とケース２６の端面２７との間にＯリング３３が介在している。 Further, in the thrust bearing, an O-ring 33 is interposed between the back surface side corner portion of the inner diameter surface of the shaft race board 21 and the end surface 27 of the case 26.

上記のスラスト軸受は、ケース２６の周壁２８とリップ３２ａとの間、凸部３２ｂとハウジング軌道盤２２の背面側に取り付けられる相手部材（図示省略）との間、およびケース２６とＯリング３３との間に接触シールが形成されている。これらの接触シールにより、上記スラスト軸受のシール性の向上が図られている。 The thrust bearing is provided between the peripheral wall 28 of the case 26 and the lip 32a, between the convex portion 32b and the mating member (not shown) attached to the back side of the housing raceway board 22, and between the case 26 and the O-ring 33. A contact seal is formed between the two. By these contact seals, the sealing property of the thrust bearing is improved.

また、図８に示すように、上記スラスト軸受として、ハウジング軌道盤２２とケース２６のカシメ部２９との間、およびハウジング軌道盤２２の背面と上述の相手部材との間にＯリング３４、３５を設けたものも従来から知られている（特許文献１の図１参照）。 Further, as shown in FIG. 8, as the thrust bearing, the O-rings 34 and 35 are provided between the housing track board 22 and the caulked portion 29 of the case 26, and between the back surface of the housing track board 22 and the mating member described above. Is also conventionally known (see FIG. 1 of Patent Document 1).

特開２００７−３０９３５２号公報JP-A-2007-309352

図７に示すスラスト軸受では、その組み立てに手間が掛かるものである。すなわち、まず、ケース２６にＯリング３３および軸軌道盤２１を圧入し、複数の玉２５を軌道溝２３内に配置する。その後、シール部材３０を装着したハウジング軌道盤２２をケース２６内に嵌め合わせ、ケース２６の周壁２８の周縁部を加締めてカシメ部２９を形成する必要があった。 The thrust bearing shown in FIG. 7 is troublesome to assemble. That is, first, the O-ring 33 and the shaft track board 21 are press-fitted into the case 26, and a plurality of balls 25 are arranged in the track groove 23. After that, it was necessary to fit the housing track board 22 equipped with the seal member 30 into the case 26 and crimp the peripheral edge portion of the peripheral wall 28 of the case 26 to form the caulked portion 29.

また、図８に示すスラスト軸受でも、ハウジング軌道盤２２にシール部材３０を装着する必要はないが、その代わりにＯリング３４、３５をハウジング軌道盤２２に装着する必要があり、その組み立てに手間が掛かるものである。 Further, even in the thrust bearing shown in FIG. 8, it is not necessary to mount the seal member 30 on the housing track board 22, but instead, it is necessary to mount the O-rings 34 and 35 on the housing track board 22, which is troublesome to assemble. Is hung.

そこで、この発明の課題は、シール性を確保しつつ、容易に組み立てることができるスラスト軸受を提供することである。 Therefore, an object of the present invention is to provide a thrust bearing that can be easily assembled while ensuring the sealing property.

上記の課題を解決するために、この発明に係るスラスト軸受は、軌道溝を有する軸軌道盤と、軌道溝を有するハウジング軌道盤と、前記軸軌道盤の軌道溝と前記ハウジング軌道盤の軌道溝との間に介在する転動体と、前記軸軌道盤に嵌り合う筒状のケースとを備え、前記ケースが前記軸軌道盤の背面を覆う環状の端面部と、前記端面部の外周部に設けられ、前記軸軌道盤に嵌り合う筒状の周壁部と、前記周壁部の周縁部に形成されるカシメ部とを有し、前記周壁部と前記ハウジング軌道盤との間に、その周壁部とハウジング軌道盤とが相互回転可能となるすき間が形成され、前記ハウジング軌道盤の外周面の背面側に面取り部が形成され、前記面取り部と前記ケースのカシメ部が対向するスラスト軸受において、前記端面部が前記軸軌道盤の背面に接触する第一シール部を有し、前記カシメ部が前記ハウジング軌道盤の面取り部に摺接する第二シール部を有する構成を採用することができる。 In order to solve the above problems, the thrust bearing according to the present invention includes an shaft race disc having a raceway groove, a housing racetrack having a raceway groove, a raceway groove of the shaft racetrack, and a raceway groove of the housing racetrack. A rolling element interposed between the two and a tubular case that fits into the shaft race disc is provided, and the case is provided on an annular end face portion that covers the back surface of the shaft race disc and an outer peripheral portion of the end face portion. It has a tubular peripheral wall portion that fits into the shaft raceway board and a caulking portion formed on the peripheral edge portion of the peripheral wall portion, and between the peripheral wall portion and the housing track board, the peripheral wall portion and the peripheral wall portion. In a thrust bearing in which a gap is formed so that the housing racetrack can rotate with each other, a chamfered portion is formed on the back surface side of the outer peripheral surface of the housing racetrack, and the chamfered portion and the crimped portion of the case face each other, the end surface A configuration can be adopted in which the portion has a first seal portion that contacts the back surface of the shaft track disc, and the caulked portion has a second seal portion that slides into contact with the chamfered portion of the housing track disc.

この構成のケースを軸軌道盤に嵌め合わせ、転動体およびハウジング軌道盤を嵌め合わせて、ケースのカシメ部を加締めると、ケースの端面部と軸軌道盤の背面との間に第一シール部による接触シールが形成され、カシメ部とハウジング軌道盤の面取り部との間に第二シール部による接触シールが形成される。 When the case of this configuration is fitted to the shaft race disc, the rolling elements and the housing race disc are fitted, and the crimped portion of the case is crimped, the first seal portion is formed between the end face portion of the case and the back surface of the shaft race disc. A contact seal is formed by the second seal portion, and a contact seal by the second seal portion is formed between the caulked portion and the chamfered portion of the housing track board.

シール性を効果的に向上させるために、前記第二シール部が弾性体から形成される内リップを有する構成を採用すると、ハウジング軌道盤の回転に伴う、ハウジング軌道盤の面取り部の微小な変位に追従して複数の内リップがそれぞれ摺接する。さらに、シール性の向上を図るために、前記内リップが径方向に並んで複数形成されている構成を採用することができる。 When the configuration in which the second seal portion has an inner lip formed of an elastic body is adopted in order to effectively improve the sealing property, a minute displacement of the chamfered portion of the housing track disc with the rotation of the housing track disc is adopted. A plurality of inner lips are in sliding contact with each other following the above. Further, in order to improve the sealing property, it is possible to adopt a configuration in which a plurality of the inner lips are formed side by side in the radial direction.

上記構成において、前記第二シール部が前記弾性体から形成される外リップを有し、前記外リップが径方向外向きにかつ軸方向外向きに延び出しており、前記外リップの周縁部が前記ハウジング軌道盤の背面よりも軸方向外側に位置している構成を採用することができる。この構成の外リップと、ハウジング軌道盤の背面側に取り付けられる相手部材との間に接触シールが形成される。 In the above configuration, the second seal portion has an outer lip formed from the elastic body, the outer lip extends outward in the radial direction and outward in the axial direction, and the peripheral edge portion of the outer lip is formed. It is possible to adopt a configuration in which the housing track board is located on the outer side in the axial direction from the back surface. A contact seal is formed between the outer lip of this configuration and the mating member attached to the back side of the housing track board.

前記第二シール部の内リップが周方向一部に形成される切り欠き部を有する構成を採用することができる。ここで、ケースのカシメ部を加締める際に、縮径する第二シールの内リップが撓んで波打つことがある。この構成では、内リップの波打ちを防止し、シール性を維持することができる。 A configuration can be adopted in which the inner lip of the second seal portion has a notch formed in a part in the circumferential direction. Here, when the crimped portion of the case is crimped, the inner lip of the second seal whose diameter is reduced may be bent and wavy. In this configuration, waviness of the inner lip can be prevented and the sealing property can be maintained.

前記カシメ部が前記ハウジング軌道盤の面取り部に摺接する第三シール部を有し、前記第三シール部が前記弾性体から形成されるリップを有し、そのリップが周方向の一部に形成される切り欠き部を有し、前記第二シール部の内リップの切り欠き部と、前記第三シール部のリップの切り欠き部は、それぞれ異なる周方向位置に配置されている構成を採用することができる。 The crimped portion has a third seal portion that is in sliding contact with the chamfered portion of the housing track board, the third seal portion has a lip formed from the elastic body, and the lip is formed in a part in the circumferential direction. The notch portion of the inner lip of the second seal portion and the notch portion of the lip of the third seal portion are arranged at different circumferential positions. be able to.

この構成では、カシメ部には、少なくとも第二シール部の内リップおよび第三シール部のリップのいずれか一方が周方向に沿って存在している。このため、カシメ部とハウジング軌道盤との間のシール性を確保することができる。 In this configuration, at least one of the inner lip of the second seal portion and the lip of the third seal portion exists in the crimped portion along the circumferential direction. Therefore, the sealing property between the caulked portion and the housing track board can be ensured.

また、前記第一シール部が弾性体から形成されるリップを有し、そのリップが前記軸軌道盤の内周部よりも径方向内側に延び出している構成を採用することができる。この第一シール部のリップがスラスト軸受に挿通する軸体に接触し、その軸体とケースの端面部との間に接触シールが形成される。 Further, it is possible to adopt a configuration in which the first seal portion has a lip formed of an elastic body, and the lip extends radially inward from the inner peripheral portion of the shaft race board. The lip of the first seal portion comes into contact with the shaft body inserted into the thrust bearing, and a contact seal is formed between the shaft body and the end face portion of the case.

また、前記第一シール部のリップが軸方向に並んで複数形成されている構成を採用すると、スラスト軸受に挿通する軸体とケースの端面部との間に形成される接触シールのシール性を向上させることができる。 Further, if a configuration in which a plurality of lips of the first seal portion are formed side by side in the axial direction is adopted, the sealability of the contact seal formed between the shaft body inserted into the thrust bearing and the end face portion of the case can be improved. Can be improved.

この発明は、ケースの端面部に第一シール部が設けられ、周壁部に第二シール部が設けられているので、ケースの周壁部を軸軌道盤に嵌め合わせて、カシメ部を加締めることにより、シール性を確保しつつ、容易に軸受を組み立てることができる。 In the present invention, since the first seal portion is provided on the end face portion of the case and the second seal portion is provided on the peripheral wall portion, the peripheral wall portion of the case is fitted to the shaft race disc and the crimped portion is crimped. As a result, the bearing can be easily assembled while ensuring the sealing property.

この発明の第一実施形態に係るスラスト軸受を示す断面図Sectional drawing which shows the thrust bearing which concerns on 1st Embodiment of this invention. （ａ）同上の第一シール部を示す拡大断面図、（ｂ）同上の第二シール部を示す拡大断面図(A) Enlarged sectional view showing the first sealed portion of the same, (b) Enlarged sectional view showing the second sealed portion of the same. （ａ）同上のケースの加工前状態を示す断面図、（ｂ）同上のケースの加工前状態を示す平面図、（ｃ）同上のケースを示す断面図(A) Cross-sectional view showing the pre-processed state of the same case, (b) Plan view showing the pre-processed state of the same case, (c) Cross-sectional view showing the same case. （ａ）同上の第一シール部の他の形態を示す拡大断面図、（ｂ）同上の第二シール部の他の形態を示す拡大断面図、（ｃ）同上の第二シール部のさらに他の形態を示す拡大断面図(A) An enlarged cross-sectional view showing another form of the first seal portion of the same, (b) An enlarged cross-sectional view showing another form of the second seal portion of the same, (c) Further of the second seal portion of the same. Enlarged sectional view showing the morphology of （ａ）この発明の第二実施形態に係るスラスト軸受の第二シール部を示す拡大断面図、（ｂ）同上のケースの加工前状態を示す断面図、（ｂ）同上のケースの加工前状態を示す平面図(A) An enlarged cross-sectional view showing the second seal portion of the thrust bearing according to the second embodiment of the present invention, (b) a cross-sectional view showing the pre-processed state of the same case, and (b) the pre-processed state of the same case. Top view showing （ａ）この発明の第三実施形態に係るスラスト軸受の第二シール部を示す拡大断面図、（ｂ）同上のケースの加工前状態を示す断面図、（ｂ）同上のケースの加工前状態を示す平面図(A) An enlarged cross-sectional view showing the second seal portion of the thrust bearing according to the third embodiment of the present invention, (b) a cross-sectional view showing the pre-processed state of the same case, and (b) the pre-processed state of the same case. Top view showing 従来のスラスト軸受を示す断面図Sectional view showing a conventional thrust bearing 従来のスラスト軸受の他の形態を示す断面図Sectional drawing showing another form of the conventional thrust bearing

以下、この発明の実施形態を図面に基づいて説明する。図１は、この発明の実施形態のスラスト軸受を示す。このスラスト軸受は、軌道溝３を有する軸軌道盤１と、軌道溝４を有するハウジング軌道盤２と、軸軌道盤１の軌道溝３とハウジング軌道盤２の軌道溝４との間に介在する転動体である玉５と、軸軌道盤１に嵌り合うケース６とを備えている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a thrust bearing according to an embodiment of the present invention. This thrust bearing is interposed between the shaft track board 1 having the track groove 3, the housing track board 2 having the track groove 4, the track groove 3 of the shaft track board 1, and the track groove 4 of the housing track board 2. It includes a ball 5 which is a rolling element and a case 6 which fits into the shaft track board 1.

この実施形態は、自動車、フォークリフト等のサスペンション、ステアリング等に用いられるキングピンに適用される。この実施形態は、転動体が玉５であるスラスト軸受であるが、例えば、転動体が円筒ころや円すいころであるスラストころ軸受に適用することができる。 This embodiment is applied to a kingpin used for suspensions of automobiles, forklifts and the like, steering and the like. This embodiment is a thrust bearing in which the rolling element is a ball 5, but can be applied to, for example, a thrust roller bearing in which the rolling element is a cylindrical roller or a tapered roller.

ここで、「周方向」とは、特に言及しない限り、軸受中心軸周りの円周方向のことをいう。また、特に言及しない限り、軸受中心軸に沿った方向のことを単に「軸方向」といい、軸受中心軸に対し直角な方向のことを単に「径方向」という。 Here, the "circumferential direction" refers to the circumferential direction around the central axis of the bearing unless otherwise specified. Unless otherwise specified, the direction along the bearing central axis is simply referred to as "axial direction", and the direction perpendicular to the bearing central axis is simply referred to as "diameter direction".

軸軌道盤１は円環状部材からなり、軸方向一方の側面がアキシアル荷重を支持する背面とされ、軸方向他方の側面に軌道溝３が形成されるものである。軌道溝３のアキシアル平面での断面形状は円弧をなしている。 The axial track board 1 is made of an annular member, one side surface in the axial direction is a back surface that supports an axial load, and a track groove 3 is formed on the other side surface in the axial direction. The cross-sectional shape of the raceway groove 3 on the axial plane is an arc.

ハウジング軌道盤２は円環状部材からなり、軸方向他方の側面がアキシアル荷重を支持する背面とされ、軸方向一方の側面に軌道溝４が形成されるものである。軌道溝４は、軌道溝３に軸方向に対向し、アキシアル平面での断面形状は円弧をなしている。ハウジング軌道盤２の外周部の背面側に面取り部２ａが形成されている。面取り部２ａは、軸方向他方に向かうに従い径方向内向きに傾斜している。 The housing track board 2 is made of an annular member, the other side surface in the axial direction is a back surface that supports an axial load, and the raceway groove 4 is formed on one side surface in the axial direction. The raceway groove 4 faces the raceway groove 3 in the axial direction, and the cross-sectional shape on the axial plane is an arc. A chamfered portion 2a is formed on the back surface side of the outer peripheral portion of the housing track board 2. The chamfered portion 2a is inclined inward in the radial direction toward the other in the axial direction.

ハウジング軌道盤２の内径寸法は軸軌道盤１の内径寸法よりもわずかに大きい。ハウジング軌道盤２の外径寸法は軸軌道盤１の外径寸法よりもわずかに小さい。 The inner diameter of the housing track board 2 is slightly larger than the inner diameter of the shaft track board 1. The outer diameter of the housing track board 2 is slightly smaller than the outer diameter of the shaft track board 1.

軌道溝３および軌道溝４のアキシアル平面での断面形状の円弧は同じ半径であり、転動体である玉５の半径よりもわずかに大きい。 The arcs of the cross-sectional shapes of the track groove 3 and the track groove 4 in the axial plane have the same radius, and are slightly larger than the radius of the ball 5 which is a rolling element.

ケース６は、円環状の金属板を折り曲げ加工した筒状部材である。ケース６は、軸軌道盤１の背面を覆う円環状の端面部７と、軸軌道盤１の外周部に圧入により嵌め合わされる円筒状の周壁部８と、周壁部８の軸方向他方の周縁部に形成されるカシメ部９とを有している。 The case 6 is a tubular member obtained by bending an annular metal plate. The case 6 has an annular end face portion 7 that covers the back surface of the shaft race plate 1, a cylindrical peripheral wall portion 8 that is press-fitted into the outer peripheral portion of the shaft race plate 1, and the other peripheral edge in the axial direction of the peripheral wall portion 8. It has a crimped portion 9 formed in the portion.

端面部７はその内周部に第一シール部１０を有する。端面部７の内周部は軸軌道盤１の内周部よりも径方向外側に位置している。図２（ａ）に示すように、第一シール部１０は、端面部７の内周部の全周にモールドした弾性体１１と、その弾性体１１で形成されるリップ１１ａとを有する。第一シール部１０の弾性体１１が軸軌道盤１の背面に接触する状態となっている。 The end face portion 7 has a first seal portion 10 on the inner peripheral portion thereof. The inner peripheral portion of the end face portion 7 is located radially outside the inner peripheral portion of the shaft track board 1. As shown in FIG. 2A, the first seal portion 10 has an elastic body 11 molded around the entire inner peripheral portion of the end face portion 7, and a lip 11a formed by the elastic body 11. The elastic body 11 of the first seal portion 10 is in contact with the back surface of the shaft track board 1.

リップ１１ａは弾性体１１から径方向内向きに全周にわたり突出している。リップ１１ａの内縁部が、軸軌道盤１の内周部よりも径方向内側に位置している。弾性体１１は、例えば、ニトリルゴム、耐熱ニトリルゴム、水素添加ニトリルゴム、アクリルゴム、フッ素ゴム等の耐油性又は耐熱性に優れたゴムを素材としている。 The lip 11a projects radially inward from the elastic body 11 over the entire circumference. The inner edge portion of the lip 11a is located radially inside the inner peripheral portion of the shaft track board 1. The elastic body 11 is made of a rubber having excellent oil resistance or heat resistance, such as nitrile rubber, heat-resistant nitrile rubber, hydrogenated nitrile rubber, acrylic rubber, and fluororubber.

周壁部８は、軸軌道盤１に圧入により嵌め合わされ、軸軌道盤１と一体化している。周壁部８とハウジング軌道盤２との間に、周壁部８とハウジング軌道盤２とが相対回転可能となる径方向のすき間が形成されている。 The peripheral wall portion 8 is fitted into the shaft race disc 1 by press fitting, and is integrated with the shaft race disc 1. A radial gap is formed between the peripheral wall portion 8 and the housing track board 2 so that the peripheral wall portion 8 and the housing track board 2 can rotate relative to each other.

カシメ部９は、軸方向他方に向かうに従い径方向内向きに傾斜する状態に形成されている。カシメ部９がハウジング軌道盤２の面取り部２ａとすき間をもって対向している。カシメ部９の径方向内面に第二シール部１２が形成されている。 The caulking portion 9 is formed so as to be inclined inward in the radial direction toward the other in the axial direction. The caulking portion 9 faces the chamfered portion 2a of the housing track board 2 with a gap. A second seal portion 12 is formed on the radial inner surface of the caulking portion 9.

図２（ｂ）に示すように、第二シール部１２は、カシメ部９の径方向内面の全周にモールドした弾性体１３と、その弾性体１３から形成される複数の内リップ１３ａとを有する。それぞれの内リップ１３ａは、カシメ部９に沿って全周に径方向に並んで配置され、面取り部２ａに向かって延び出している。 As shown in FIG. 2B, the second seal portion 12 has an elastic body 13 molded around the entire radial inner surface of the caulking portion 9, and a plurality of inner lips 13a formed from the elastic body 13. Have. The inner lips 13a are arranged along the crimped portion 9 in the radial direction along the entire circumference, and extend toward the chamfered portion 2a.

それぞれの内リップ１３ａの内縁部が全周にわたってハウジング軌道盤２の面取り部２ａに摺接している。第二シール部１２の弾性体１３は、第一シール部１０の弾性体１１と同じ素材が使用可能である。なお、第二シール部１２は、弾性体１３から単一の内リップ１３ａを形成してもよい。 The inner edge portion of each inner lip 13a is in sliding contact with the chamfered portion 2a of the housing track board 2 over the entire circumference. As the elastic body 13 of the second seal portion 12, the same material as the elastic body 11 of the first seal portion 10 can be used. The second seal portion 12 may form a single inner lip 13a from the elastic body 13.

この実施形態のスラスト軸受は、以上のように構成される。以下に、このスラスト軸受の組み立て方法を説明する。
スラスト軸受の組み立て前に、予めケース６を製作する。ケース６は、図３（ａ）、（ｂ）に示す円環状の金属板部材Ｗを素材としており、その円環状の金属板部材Ｗの内周部に上述の第一シール部１０を設け、外周部の軸方向他方側の表面に上述の第二シール部１２を設ける。 The thrust bearing of this embodiment is configured as described above. The method of assembling this thrust bearing will be described below.
Before assembling the thrust bearing, the case 6 is manufactured in advance. The case 6 is made of the annular metal plate member W shown in FIGS. 3A and 3B, and the above-mentioned first seal portion 10 is provided on the inner peripheral portion of the annular metal plate member W. The above-mentioned second seal portion 12 is provided on the surface of the outer peripheral portion on the other side in the axial direction.

次に、図３（ｃ）に示すように、金属板部材Ｗの径方向途中位置の全周において、外周部を軸方向他方へ折り曲げ加工を行い、端面部７、周壁部８およびカシメ部９を有するケース６を製作する。 Next, as shown in FIG. 3C, the outer peripheral portion is bent in the other direction in the axial direction on the entire circumference of the metal plate member W at the intermediate position in the radial direction, and the end face portion 7, the peripheral wall portion 8 and the caulking portion 9 are bent. A case 6 having the above is manufactured.

この状態のケース６は、カシメ部９が周壁部８に沿う円筒状をなしている。このケース６に対して、端面部７側に軸軌道盤１の背面が位置する状態で、軸軌道盤１を周壁部８に圧入により嵌め合わせる。この嵌め合わせにより、ケース６の第一シール部１０の弾性体１１がケース６の端面部７と軸軌道盤１の背面に接触する。 In the case 6 in this state, the crimped portion 9 has a cylindrical shape along the peripheral wall portion 8. With respect to this case 6, the shaft race disc 1 is press-fitted into the peripheral wall portion 8 with the back surface of the shaft race disc 1 located on the end face portion 7 side. By this fitting, the elastic body 11 of the first seal portion 10 of the case 6 comes into contact with the end face portion 7 of the case 6 and the back surface of the shaft race board 1.

続いて、軸軌道盤１の軌道溝３内に複数の玉５を入れ、軸方向一方側に軌道溝４が位置する状態でハウジング軌道盤２を周壁部８内に入れる。このとき、ケース６の周壁部８により、軸軌道盤１およびハウジング軌道盤２の外周部が覆われる状態となる。その後、カシメ部９を径方向内向きに加締め、カシメ部９をケース６からのハウジング軌道盤２の抜け止めとする。 Subsequently, a plurality of balls 5 are inserted into the track groove 3 of the shaft track board 1, and the housing track board 2 is inserted into the peripheral wall portion 8 with the track groove 4 located on one side in the axial direction. At this time, the peripheral wall portion 8 of the case 6 covers the outer peripheral portions of the shaft track board 1 and the housing track board 2. After that, the crimped portion 9 is crimped inward in the radial direction, and the crimped portion 9 is used to prevent the housing track board 2 from coming off from the case 6.

また、カシメ部９を加締める際、第二シール部１２のそれぞれの内リップ１３ａをハウジング軌道盤２の面取り部２ａに接触する状態とする。この状態では、ケース６の周壁部８とハウジング軌道盤２とが相対回転可能となっている。 Further, when the caulking portion 9 is crimped, the inner lips 13a of the second seal portion 12 are brought into contact with the chamfered portion 2a of the housing track board 2. In this state, the peripheral wall portion 8 of the case 6 and the housing track board 2 can rotate relative to each other.

以上のようにこの実施形態のスラスト軸受は組み立てられる。このスラスト軸受は上述のように組み立てることで、端面部７と軸軌道盤１の背面との間に第一シール部１０の弾性体１１が設けられ、カシメ部９の第二シール部１２の内リップ１３ａがハウジング軌道盤２の面取り部２ａに摺接する状態となる。 As described above, the thrust bearing of this embodiment is assembled. By assembling this thrust bearing as described above, the elastic body 11 of the first seal portion 10 is provided between the end face portion 7 and the back surface of the shaft race board 1, and the inside of the second seal portion 12 of the caulking portion 9 is provided. The lip 13a is in a state of sliding contact with the chamfered portion 2a of the housing track board 2.

すなわち、この実施形態のスラスト軸受は、従来のように、別途、Ｏリングやシール部材の取り付け作業が不要であり、シール性を確保しつつ、容易に組み立てることができる。 That is, the thrust bearing of this embodiment does not require a separate attachment work of an O-ring or a seal member as in the conventional case, and can be easily assembled while ensuring the sealability.

なお、第一シール部１０としては、図４（ａ）に示すように、弾性体１１から軸方向に並ぶ二列のリップ１１ａを形成することができる。この場合、それぞれのリップ１１ａは、この実施形態のスラスト軸受を取り付ける軸体Ｓに摺接する。 As shown in FIG. 4A, the first seal portion 10 can form two rows of lips 11a arranged in the axial direction from the elastic body 11. In this case, each lip 11a is in sliding contact with the shaft body S to which the thrust bearing of this embodiment is attached.

また、第二シール部１２としては、図４（ｂ）に示すように、弾性体１３から内リップ１３ａを径方向に並んで３箇所に形成してもよい。カシメ部９とハウジング軌道盤２の面取り部２ａとの間のシール性を維持することができれば、例えば、内リップ１３ａを径方向に並んで４箇所以上の複数形成することができる。 Further, as the second seal portion 12, as shown in FIG. 4B, the inner lips 13a may be formed at three positions arranged in the radial direction from the elastic body 13. If the sealing property between the caulking portion 9 and the chamfered portion 2a of the housing track board 2 can be maintained, for example, a plurality of inner lips 13a can be formed in a radial direction at four or more locations.

さらに、図４（ｃ）に示すように、第二シール部１２としては、カシメ部９の先端縁部を覆う状態に弾性体１３をモールドし、カシメ部９の径方向内面の弾性体１３から内リップ１３ａを三箇所に形成し、カシメ部９の径方向外面の弾性体１３から外リップ１３ｂを形成してもよい。 Further, as shown in FIG. 4C, as the second seal portion 12, the elastic body 13 is molded so as to cover the tip edge portion of the crimped portion 9, and the elastic body 13 on the inner surface in the radial direction of the crimped portion 9 is formed. The inner lip 13a may be formed at three positions, and the outer lip 13b may be formed from the elastic body 13 on the radial outer surface of the crimped portion 9.

外リップ１３ｂは、カシメ部９から径方向外向きにかつ軸方向外向きに延び出している。外リップ１３ｂの周縁部はハウジング軌道盤２の背面よりも軸方向外側に位置している。このため、外リップ１３ｂがハウジング軌道盤２の背面側に取り付けられる相手部材Ｘに接触する。これにより、カシメ部９と相手部材Ｘとの間に接触シールが形成される。 The outer lip 13b extends radially outwardly and axially outward from the crimped portion 9. The peripheral edge of the outer lip 13b is located axially outward from the back surface of the housing track board 2. Therefore, the outer lip 13b comes into contact with the mating member X attached to the back surface side of the housing track board 2. As a result, a contact seal is formed between the caulking portion 9 and the mating member X.

この発明の第二実施形態に係るスラスト軸受を図５（ａ）に示す。第二実施形態のスラスト軸受は、第二シール部１２の内リップ１３ａが切り欠き部１４を有している点で、第一実施形態の構成と相違している。その他の構成において、第一実施形態と同一の構成は同一の符号を付してその説明を省略する。 The thrust bearing according to the second embodiment of the present invention is shown in FIG. 5 (a). The thrust bearing of the second embodiment is different from the configuration of the first embodiment in that the inner lip 13a of the second seal portion 12 has a notch portion 14. In other configurations, the same configurations as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

この実施形態のスラスト軸受では、第二シール部１２の径方向に並んで二箇所に内リップ１３ａが形成され、それぞれの内リップ１３ａが周方向の複数箇所で切り欠き部１４を有するものである。それぞれの内リップ１３ａの切り欠き部１４は、同じ周方向の位置に形成されている。なお、内リップ１３ａの切り欠き部１４は、周方向の１箇所のみに形成してもよい。 In the thrust bearing of this embodiment, inner lips 13a are formed at two locations arranged in the radial direction of the second seal portion 12, and each inner lip 13a has notches 14 at a plurality of locations in the circumferential direction. .. The cutout portion 14 of each inner lip 13a is formed at a position in the same circumferential direction. The cutout portion 14 of the inner lip 13a may be formed at only one location in the circumferential direction.

この実施形態の第二シール部１２は、上述の第一実施形態のスラスト軸受と同様に、図５（ｂ）、（ｃ）に示すように、ケース６として製作される金属板部材Ｗの外周部の軸方向他方側の表面に設けられる。 The second seal portion 12 of this embodiment is the outer circumference of the metal plate member W manufactured as the case 6 as shown in FIGS. 5 (b) and 5 (c), similarly to the thrust bearing of the first embodiment described above. It is provided on the surface of the other side in the axial direction of the portion.

ここで、金属板部材Ｗからケース６を製作し、カシメ部９を加締める際に、縮径する内リップ１３ａが撓んで波打つことがある。この実施形態では、図５（ｃ）に示すように、第二シール部１２の内リップ１３ａの切り欠き部１４が周方向に等間隔に形成されている。このため、内リップ１３ａの撓みを切り欠き部１４へ逃がすことができ、内リップ１３ａの波打ちを防止することができる。その結果、第二シール部１２でのシール性を確保することができる。 Here, when the case 6 is manufactured from the metal plate member W and the crimped portion 9 is crimped, the inner lip 13a having a reduced diameter may bend and undulate. In this embodiment, as shown in FIG. 5C, notches 14 of the inner lip 13a of the second seal portion 12 are formed at equal intervals in the circumferential direction. Therefore, the bending of the inner lip 13a can be released to the cutout portion 14, and the waviness of the inner lip 13a can be prevented. As a result, the sealing property of the second sealing portion 12 can be ensured.

この発明の第三実施形態に係るスラスト軸受を図６（ａ）に示す。第三実施形態のスラスト軸受は、第二シール部１２の内リップ１３ａが切り欠き部１４を有している点、ケース６のカシメ部９がさらに第三シール部１５を有する点、第三シール部１５の弾性体１６から形成されるリップ１６ａが周方向一部に切り欠き部１７を有する点で第一実施形態の構成と相違している。その他の構成において、第一実施形態と同一の構成は同一の符号を付してその説明を省略する。 The thrust bearing according to the third embodiment of the present invention is shown in FIG. 6A. The thrust bearing of the third embodiment has a point that the inner lip 13a of the second seal portion 12 has a notch portion 14, a point that the caulking portion 9 of the case 6 further has a third seal portion 15, and a third seal. It differs from the configuration of the first embodiment in that the lip 16a formed from the elastic body 16 of the portion 15 has a notch portion 17 in a part in the circumferential direction. In other configurations, the same configurations as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

この実施形態のスラスト軸受の第二シール部１２は、弾性体１３から形成される単一の内リップ１３ａを有している。第二シール部１２の内リップ１３ａは、周方向の複数箇所に切り欠き部１４を有している。 The second seal portion 12 of the thrust bearing of this embodiment has a single inner lip 13a formed from the elastic body 13. The inner lip 13a of the second seal portion 12 has notches 14 at a plurality of positions in the circumferential direction.

ケース６のカシメ部９の径方向内面に第三シール部１５が形成されている。図６（ａ）に示すように、第三シール部１５は、カシメ部９の径方向内面および先端面の全周にモールドした弾性体１６と、弾性体１６から形成されるリップ１６ａとを有している。第三シール部１５のリップ１６ａは、周方向複数箇所に形成される切り欠き部１７を有する。 A third seal portion 15 is formed on the radial inner surface of the crimped portion 9 of the case 6. As shown in FIG. 6A, the third seal portion 15 has an elastic body 16 molded on the entire radial inner surface and the tip surface of the caulking portion 9, and a lip 16a formed from the elastic body 16. are doing. The lip 16a of the third seal portion 15 has notches 17 formed at a plurality of positions in the circumferential direction.

この実施形態の第二シール部１２および第三シール部１５は、上述の第一実施形態のスラスト軸受と同様に、図６（ｂ）、（ｃ）に示すように、ケース６として製作される金属板部材Ｗの外周部の軸方向他方側の表面に設けられる。 The second seal portion 12 and the third seal portion 15 of this embodiment are manufactured as a case 6 as shown in FIGS. 6 (b) and 6 (c), similarly to the thrust bearing of the first embodiment described above. It is provided on the surface of the outer peripheral portion of the metal plate member W on the other side in the axial direction.

第二シール部１２の内リップ１３ａと第三シール部１５のリップ１６ａは、それぞれの切り欠き部１４と切り欠き部１７とが周方向に異なる位置となるように配置されたものである。 The inner lip 13a of the second seal portion 12 and the lip 16a of the third seal portion 15 are arranged so that the notch portions 14 and the notch portions 17 are located at different positions in the circumferential direction.

これにより、ケース６のカシメ部９には、第二シール部１２の内リップ１３ａおよび第三シール部１５のリップ１６ａの少なくとも一方が周方向に沿って存在している。このため、ケース６のカシメ部９とハウジング軌道盤２の面取り部２ａとの間に、シール性を確保することができる。 As a result, at least one of the inner lip 13a of the second seal portion 12 and the lip 16a of the third seal portion 15 is present in the crimped portion 9 of the case 6 along the circumferential direction. Therefore, a sealing property can be ensured between the crimped portion 9 of the case 6 and the chamfered portion 2a of the housing track board 2.

１ 軸軌道盤
２ ハウジング軌道盤
２ａ 面取り部
３、４ 軌道溝
５ 玉
６ ケース
７ 端面部
８ 周壁部
９ カシメ部
１０ 第一シール部
１１、１３、１６ 弾性体
１１ａ、１６ａ リップ
１３ａ 内リップ
１３ｂ 外リップ
１２ 第二シール部
１４、１７ 切り欠き部
１５ 第三シール部
Ｓ 軸体
Ｗ 金属板部材
Ｘ 相手部材 1 Axis track board 2 Housing track board 2a Chamfered part 3, 4 Track groove 5 Ball 6 Case 7 End face part 8 Peripheral wall part 9 Caulking part 10 First seal part 11, 13, 16 Elastic body 11a, 16a Lip 13a Inner lip 13b Outside Lip 12 Second seal portion 14, 17 Notch portion 15 Third seal portion S Shaft body W Metal plate member X Mating member

Claims (8)

軌道溝を有する軸軌道盤と、軌道溝を有するハウジング軌道盤と、前記軸軌道盤の軌道溝と前記ハウジング軌道盤の軌道溝との間に介在する転動体と、前記軸軌道盤に嵌り合う筒状のケースとを備え、
前記ケースが前記軸軌道盤の背面を覆う環状の端面部と、前記軸軌道盤に嵌り合う筒状の周壁部と、前記周壁部の周縁部に形成されるカシメ部とを有し、
前記周壁部と前記ハウジング軌道盤との間に、その周壁部とハウジング軌道盤とが相互回転可能となるすき間が形成され、前記ハウジング軌道盤の外周面の背面側に面取り部が形成され、前記面取り部と前記ケースのカシメ部が対向するスラスト軸受において、
前記端面部が前記軸軌道盤の背面に接触する第一シール部を有し、前記カシメ部が前記ハウジング軌道盤の面取り部に摺接する第二シール部を有することを特徴とするスラスト軸受。 An axial track board having a track groove, a housing track board having a track groove, and a rolling element interposed between the track groove of the shaft track board and the track groove of the housing track board are fitted to the shaft track board. Equipped with a tubular case,
The case has an annular end face portion that covers the back surface of the shaft track board, a tubular peripheral wall portion that fits the shaft track board, and a caulking portion formed on the peripheral edge portion of the peripheral wall portion.
A gap is formed between the peripheral wall portion and the housing track board so that the peripheral wall portion and the housing track board can rotate with each other, and a chamfered portion is formed on the back surface side of the outer peripheral surface of the housing track board. In a thrust bearing in which the chamfered portion and the crimped portion of the case face each other,
A thrust bearing characterized in that the end face portion has a first seal portion that contacts the back surface of the shaft track disc, and the caulked portion has a second seal portion that slides into a chamfered portion of the housing race disc. 前記第二シール部が弾性体から形成される内リップを有することを特徴とする請求項１に記載されたスラスト軸受。 The thrust bearing according to claim 1, wherein the second seal portion has an inner lip formed of an elastic body. 前記内リップが周方向一部に形成される切り欠き部を有することを特徴とする請求項２に記載されたスラスト軸受。 The thrust bearing according to claim 2, wherein the inner lip has a notch formed in a part in the circumferential direction. 前記カシメ部が前記ハウジング軌道盤の面取り部に摺接する第三シール部を有し、前記第三シール部が前記弾性体から形成されるリップを有し、そのリップが周方向の一部に形成される切り欠き部を有し、前記第二シール部の内リップの切り欠き部と、前記第三シール部のリップの切り欠き部は、それぞれ異なる周方向位置に配置されていることを特徴とする請求項３に記載されたスラスト軸受。 The caulked portion has a third seal portion that is in sliding contact with the chamfered portion of the housing track board, the third seal portion has a lip formed from the elastic body, and the lip is formed in a part in the circumferential direction. It is characterized in that the notch portion of the inner lip of the second seal portion and the notch portion of the lip of the third seal portion are arranged at different circumferential positions. The thrust bearing according to claim 3. 前記内リップが径方向に並んで複数形成されていることを特徴とする請求項２または３に記載されたスラスト軸受。 The thrust bearing according to claim 2 or 3, wherein a plurality of inner lips are formed side by side in the radial direction. 前記第二シール部が前記弾性体から形成される外リップを有し、前記外リップが径方向外向きにかつ軸方向外向きに延び出しており、前記外リップの周縁部が前記ハウジング軌道盤の背面よりも軸方向外側に位置していることを特徴とする請求項２または３に記載されたスラスト軸受。 The second seal portion has an outer lip formed from the elastic body, the outer lip extends outward in the radial direction and outward in the axial direction, and the peripheral portion of the outer lip is the housing raceway board. The thrust bearing according to claim 2 or 3, wherein the thrust bearing is located axially outward from the back surface of the bearing. 前記第一シール部が弾性体から形成されるリップを有し、そのリップが前記軸軌道盤の内周部よりも径方向内側に延び出していることを特徴とする請求項１から６のいずれかに記載されたスラスト軸受。 Any of claims 1 to 6, wherein the first seal portion has a lip formed of an elastic body, and the lip extends radially inward from the inner peripheral portion of the shaft track board. The thrust bearing described in. 前記第一シール部のリップが軸方向に並んで複数形成されていることを特徴とする請求項７に記載されたスラスト軸受。 The thrust bearing according to claim 7, wherein a plurality of lips of the first seal portion are formed side by side in the axial direction.
JP2019039529A 2019-03-05 2019-03-05 thrust bearing Active JP7270416B2 (en)

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PCT/JP2020/007958 WO2020179598A1 (en) 2019-03-05 2020-02-27 Thrust bearing

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4726766Y1 (en) * 1968-12-28 1972-08-17
JPS51101651A (en) * 1975-02-03 1976-09-08 Garlock Inc
JPS54103443U (en) * 1977-12-29 1979-07-20
JPH07332378A (en) * 1994-06-03 1995-12-22 Nippon Seiko Kk Sealed type thrust bearing
JP2015075218A (en) * 2013-10-11 2015-04-20 Ntn株式会社 Roller bearing with seal device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4726766Y1 (en) * 1968-12-28 1972-08-17
JPS51101651A (en) * 1975-02-03 1976-09-08 Garlock Inc
JPS54103443U (en) * 1977-12-29 1979-07-20
JPH07332378A (en) * 1994-06-03 1995-12-22 Nippon Seiko Kk Sealed type thrust bearing
JP2015075218A (en) * 2013-10-11 2015-04-20 Ntn株式会社 Roller bearing with seal device

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