JP3855304B2 - Cross roller bearing preload adjustment structure - Google Patents

Cross roller bearing preload adjustment structure Download PDF

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Publication number
JP3855304B2
JP3855304B2 JP12190596A JP12190596A JP3855304B2 JP 3855304 B2 JP3855304 B2 JP 3855304B2 JP 12190596 A JP12190596 A JP 12190596A JP 12190596 A JP12190596 A JP 12190596A JP 3855304 B2 JP3855304 B2 JP 3855304B2
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housing
outer ring
cross roller
roller bearing
peripheral surface
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JPH09303385A (en
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逸男 渡辺
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NSK Ltd
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NSK Ltd
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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
    • F16C19/22—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
    • F16C19/34—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 for both radial and axial load
    • F16C19/36—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 for both radial and axial load with a single row of rollers
    • F16C19/361—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 for both radial and axial load with a single row of rollers with cylindrical rollers
    • F16C19/362—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 for both radial and axial load with a single row of rollers with cylindrical rollers the rollers being crossed within the single row
    • 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
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/06—Ball or roller 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
    • 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
    • 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
    • F16C2226/50—Positive connections
    • F16C2226/60—Positive connections with threaded parts, e.g. bolt and nut connections
    • 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
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/02—General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned
    • 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
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Support Of The Bearing (AREA)
  • Rolling Contact Bearings (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、軸とハウジングとの間に介在されて前記軸を回転可能に支持するクロスローラ軸受の予圧を調整する構造に関する。
【０００２】
【従来の技術】
図５に、回転軸１とハウジング２との間に介在されたクロスローラ軸受３に予圧を付与する構造を示す。クロスローラ軸受３の内輪４は回転軸１に外嵌固定されており、固定ボルト５を介して回転軸１の端部に締め付け固定された内輪押え具６によって押さえられている。
【０００３】
一方、外輪７はハウジング２に内嵌固定されている。そして、固定ボルト８を介してハウジング２の端部に締め付け固定された外輪押え具９によって外輪７を軸方向に押圧することにより、軸受３に予圧がかけられるようにされている
予圧をかける態様としては、一般に、ハウジング２と外輪押え具９とのすき間Ｃ1 を適当な量に設定し、固定ボルト８で締め込んだ時にすき間Ｃ1 をなくして該すき間Ｃ1 分だけ軸受３に定位置予圧をかける態様と、軸受３の内部アキシャルすき間Ｃ2 を適当な量に設定し、固定ボルト８で締め込んだ時にすき間Ｃ2 をなくして軸受３に予圧をかける態様とがある。なお、説明の便宜上、図ではすき間Ｃ1 ，Ｃ2 の間隔は誇張して示している。
【０００４】
【発明が解決しようとする課題】
しかしながら、かかるクロスローラ軸受の予圧付与構造においては、一般に、すき間Ｃ1 若しくはすき間Ｃ2 の設定量は非常に微妙な値であり、工作上も非常に困難であった。特に回転軸の摩擦トルクを一定値にしようとすると、すき間Ｃ1 若しくはすき間Ｃ2 の量の設定及び工作が困難を究めるという問題点があった。
【０００５】
本発明はかかる問題点を解消するためになされたものであり、予圧を自在に調整できるようにし、ひいては摩擦トルクを常に安定した値に保つことができるクロスローラ軸受の予圧調整構造を提供することを目的とする。
【０００６】
かかる目的を達成するために、本発明に係るクロスローラ軸受の予圧調整構造は、回転軸の外周面に嵌合する内周面を有する内輪と、該内輪の外周に端面同士を対向させて設けられた二つの外輪と、該外輪の外周面に嵌合する内周面を有する円筒状のハウジングと、前記外輪を前記ハウジングの内周面に形成された肩部に押圧する外輪押え具と、該外輪押え具を前記ハウジングの端面に締め付け固定する複数の固定ボルトとを備え、前記回転軸の軸方向に貫通する複数のねじ孔を前記外輪押え具に前記ハウジングの周方向に配設し、該ねじ孔の各々にねじ部材をねじ込んで前記ハウジングの端面に前記ねじ部材の先端を当接させたクロスローラ軸受の予圧を調整する構造であって、前記ねじ孔が前記固定ボルトに対して位相をずらして前記外輪押え具に形成されているとともに、前記ねじ孔にねじ込まれたねじ部材が前記固定ボルトの取付ピッチ径よりも小径の取付ピッチ径で前記ハウジングの周方向に配設されていることを特徴とする。
【０００７】
【発明の実施の形態】
以下、本発明の実施の形態の一例を図１及び図２を参照して説明する。図１は本発明の実施の形態の一例であるクロスローラ軸受の予圧調整構造を説明するための説明的断面図、図２は図１の矢印ＩＩ方向から見た図である。なお、従来例と重複する部分については、同一符号を付して説明する。
【０００８】
図１に示すように、クロスローラ軸受３は回転軸１と円筒状のハウジング２ａとの間に介在されている。クロスローラ軸受３の内輪４は回転軸１に外嵌固定されており、また、内輪４の一方の側面は回転軸１の肩４ａで受けられ、他方の側面は内輪押え具６によって押さえられている。内輪押え具６は、周方向に複数配設された固定ボルト５によって回転軸１の端部に締め付け固定されている。
【０００９】
外輪７はハウジング２ａに内嵌固定されており、また、外輪７の一方の側面はハウジング２ａの肩７ａで受けられ、他方の側面は外輪押え具１０によって軸方向に押圧されている。外輪押え具１０は、外輪７と略同径の円筒状に形成されており、一方の端部がハウジング２ａに内挿されて外輪７の他方の側面に当接している。外輪押え具１０の他方の端部には、ハウジング２ａの端面との間にすき間Ｃ1 を形成して対向するフランジ部１０ａが形成されている。フランジ部１０ａを周方向に複数配設された固定ボルト８によってハウジング２ａの端部に締め付けることにより、外輪押え具１０の一方の端部が外輪７を軸方向に押圧して軸受３に予圧がかかるようになっている。
【００１０】
また、フランジ部１０ａの固定ボルト８の径方向内方には、該フランジ部１０ａを貫通するねじ孔１１が周方向に固定ボルト８に対して位相をずらせて（図２参照）複数形成されている。ねじ孔１１には、ねじ部材としての六角穴付き止めねじ１２が螺合されており、該止めねじ１２を回転させて軸方向に進退させることにより、該止めねじ１２のハウジング２ａ側の端部がフランジ部１０ａとハウジング２ａとの間（すき間Ｃ1 ）に出没するようになっている。そして、フランジ部１０ａから突出した止めねじ１２の端面は、固定ボルト８の締め付け時にハウジング２ａの端面に当接してそれ以上の締め付けを規制する。
【００１１】
上記記載から明らかなように、従来の構造では軸受３の内部アキシャルすき間Ｃ2 は固定ボルト８により締められた分だけ軸受３に予圧として作用してしまうため、予圧量はすき間Ｃ2 の値でほぼ決定してしまうが、この実施の形態では、固定ボルト８の取付ピッチ径よりも小径の取付ピッチ径で配設された止めねじ１２で固定ボルト８の締め付けを規制しているので、軸受３に一定以上の予圧をかけないようにすることができ、しかも、止めねじ１２の突出長さは連続的に調整可能なため、軸受３に作用する予圧量を自在に調整することができる。この結果、例えば固定ボルト８と止めねじ１２の締付トルクを調整するか、又は外輪押え具１０の押し込み量を検査しながら予圧量の調整を行うことにより、回転軸１の摩擦トルクを常に安定した値に保つことが可能になり、効率の良い回転力の伝達ができる。また、ダイレクトティーチング等の手動操作で回転軸１を回さなければならない場合も容易に操作することができる。
【００１２】
なお、この実施の形態では、止めねじ１２を固定ボルト８の取付ピッチ径よりも小径の取付ピッチ径で配設した場合を例に採ったが、必ずしもこれに限定する必要はなく、止めねじ１２を固定ボルト８の取付ピッチ径よりも大径の取付ピッチ径で配設してもよい。但し、止めねじ１２を固定ボルト８の取付ピッチ径よりも小径の取付ピッチ径で配設する方が、大径の取付ピッチ径で配設する場合に比べて、より効果的に軸受３に一定以上の予圧をかけないようにすることができる。
【００１３】
【実施例】
図３及び図４は上述した実施の形態をダイレクトドライブモータの軸受構造に実施した例を示す。図３はクロスローラ軸受の予圧調整構造の実施例を説明するための説明的断面図、図４は図３の位相をずらした位置での断面図である。
【００１４】
図３に示すように、クロスローラ軸受３０は回転軸としてのロータ軸３１とハウジング３２ａとの間に介在されている。クロスローラ軸受３０の内輪３４はロータ軸３１に外嵌固定されており、また、内輪３４の一方の側面はロータ軸３１の肩３４ａで受けられ、他方の側面は内輪押え具３６によって押さえられている。内輪押え具３６は、周方向に複数配設された固定ボルト３５によってロータ軸３１の端部に締め付け固定されている。
【００１５】
外輪３７はハウジング３２ａに内嵌固定されており、また、外輪３７の一方の側面はハウジング３２ａの肩３７ａで受けられ、他方の側面は外輪押え具４０によって軸方向に押圧されている。外輪押え具４０は、ハウジング３２ａの端面との間にすき間Ｃ1 を形成して対向しており、周方向に複数配設された固定ボルト３８によってハウジング３２ａの端部に締め付けることにより、外輪押え具４０が外輪３７を軸方向に押圧して軸受３０に予圧がかかるようになっている。なお、図において符号５０はハウジング３２ａに取り付けられたステータである。
【００１６】
図４に示すように、外輪押え具４０の固定ボルト３８の径方向内方には、該外輪押え具４０を貫通するねじ孔４１が周方向に固定ボルト３８に対して位相をずらせて複数形成されている。ねじ孔４１には、六角穴付き止めねじ４２が螺合されており、該止めねじ４２を回転させて軸方向に進退させることにより、該止めねじ４２のハウジング３２ａ側の端部が外輪押え具４０とハウジング３２ａとの間（すき間Ｃ1 ）に出没するようになっている。そして、外輪押え具４０から突出した止めねじ４２の端面は、固定ボルト３８の締め付け時にハウジング３２ａの端面に当接してそれ以上の締め付けを規制する。なお、予圧量の調整方法は上記実施の形態と同一であるので省略する。
【００１７】
ここで、本来、クロスローラ軸受は大口径になるほど起動摩擦トルクが大きくなり、伝達すべき回転トルクを非常に損失させてしまうのであるが、この実施例のダイレクトドライブモータの起動摩擦トルクを測定したところ、本発明の予圧調整構造を備えていない従来の同型モータに比べて起動摩擦トルクを１／５にすることができた。
【００１８】
【発明の効果】
上記の説明から明らかなように、本発明によれば、軸受に一定以上の予圧をかけないようにすることができ、しかも、ねじ部材の突出長さは連続的に調整可能なため、軸受に作用する予圧量を自在に調整することができる。この結果、回転軸の摩擦トルクを常に安定した値に保つことが可能になり、効率の良い回転力の伝達ができると共に、ダイレクトティーチング等の手動操作で回転軸を回さなければならない場合も容易に操作することができる。
【図面の簡単な説明】
【図１】本発明の実施の形態の一例であるクロスローラ軸受の予圧調整構造を説明するための説明的断面図である。
【図２】図１の矢印ＩＩ方向から見た図である。
【図３】本発明の実施例であるクロスローラ軸受の予圧調整構造を説明するための説明的断面図である。
【図４】図３の位相をずらした位置での断面図である。
【図５】従来のクロスローラ軸受の予圧調整構造を説明するための説明的断面図である。
【符号の説明】
１…回転軸
２ａ…ハウジング
３…クロスローラ軸受
７…外輪
８…固定ボルト
１０…外輪押え具
１２…六角穴付き止めねじ（ねじ部材）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for adjusting a preload of a cross roller bearing that is interposed between a shaft and a housing and rotatably supports the shaft.
[0002]
[Prior art]
FIG. 5 shows a structure for applying a preload to the cross roller bearing 3 interposed between the rotary shaft 1 and the housing 2. The inner ring 4 of the cross roller bearing 3 is externally fitted and fixed to the rotary shaft 1 and is held by an inner ring presser 6 that is fastened and fixed to the end of the rotary shaft 1 via a fixing bolt 5.
[0003]
On the other hand, the outer ring 7 is internally fitted and fixed to the housing 2. A mode in which a preload is applied to the bearing 3 by pressing the outer ring 7 in the axial direction by an outer ring presser 9 that is fastened and fixed to the end of the housing 2 via the fixing bolt 8. In general, the clearance C 1 between the housing 2 and the outer ring retainer 9 is set to an appropriate amount, and when the fixing bolt 8 is tightened, the clearance C 1 is eliminated, and the clearance C 1 is fixed to the bearing 3 by the clearance C 1. There are a mode in which the preload is applied and a mode in which the internal axial gap C 2 of the bearing 3 is set to an appropriate amount, and when the fixing bolt 8 is tightened, the gap C 2 is eliminated and the bearing 3 is preloaded. For convenience of explanation, the gaps C 1 and C 2 are exaggerated in the figure.
[0004]
[Problems to be solved by the invention]
However, in the preload imparting structure of such a cross roller bearing, generally, the set amount of the gap C 1 or the gap C 2 is a very delicate value, and it is very difficult to work. In particular, if the friction torque of the rotating shaft is set to a constant value, there is a problem that the setting of the amount of the clearance C 1 or the clearance C 2 and the work are difficult.
[0005]
The present invention has been made to solve such a problem, and provides a preload adjusting structure for a cross roller bearing that allows preload to be freely adjusted and, in turn, can keep the friction torque at a stable value. With the goal.
[0006]
In order to achieve such an object, a preload adjusting structure for a cross roller bearing according to the present invention is provided with an inner ring having an inner peripheral surface fitted to the outer peripheral surface of a rotating shaft, and an end surface facing the outer periphery of the inner ring. Two outer rings formed, a cylindrical housing having an inner peripheral surface fitted to the outer peripheral surface of the outer ring, an outer ring presser that presses the outer ring against a shoulder formed on the inner peripheral surface of the housing, the outer race retainer and a plurality of fixing bolts that secure clamping in the end face of the housing, a plurality of screw holes extending in the axial direction of the front Symbol rotary shaft disposed in the circumferential direction of the housing to the outer ring retainer member A screw member is screwed into each of the screw holes to adjust the preload of the cross roller bearing in which the tip of the screw member is in contact with the end surface of the housing, and the screw hole is in contact with the fixing bolt. Out of phase by shifting the phase Together they are formed in the retainer, characterized in that the screw holes in the screwed a screw member is disposed in the circumferential direction of the housing in a small diameter of the mounting pitch diameter than the mounting pitch diameter of the fixing bolts .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory cross-sectional view for explaining a preload adjusting structure for a cross roller bearing as an example of an embodiment of the present invention, and FIG. 2 is a view seen from the direction of arrow II in FIG. In addition, the same code | symbol is attached | subjected and demonstrated about the part which overlaps with a prior art example.
[0008]
As shown in FIG. 1, the cross roller bearing 3 is interposed between the rotating shaft 1 and the cylindrical housing 2a. The inner ring 4 of the cross roller bearing 3 is fitted and fixed to the rotary shaft 1, and one side surface of the inner ring 4 is received by the shoulder 4 a of the rotary shaft 1 and the other side surface is pressed by the inner ring presser 6. Yes. The inner ring presser 6 is fastened and fixed to the end of the rotating shaft 1 by a plurality of fixing bolts 5 arranged in the circumferential direction.
[0009]
The outer ring 7 is internally fitted and fixed to the housing 2 a, and one side surface of the outer ring 7 is received by the shoulder 7 a of the housing 2 a, and the other side surface is pressed in the axial direction by the outer ring presser 10. The outer ring retainer 10 is formed in a cylindrical shape having substantially the same diameter as the outer ring 7, and one end thereof is inserted into the housing 2 a and is in contact with the other side surface of the outer ring 7. The other end of the outer ring presser 10, a flange portion 10a that faces form a gap C 1 between the end face of the housing 2a is formed. By tightening the flange portion 10a to the end portion of the housing 2a with a plurality of fixing bolts 8 arranged in the circumferential direction, one end portion of the outer ring retainer 10 presses the outer ring 7 in the axial direction, and the bearing 3 is preloaded. It has become such a thing.
[0010]
Further, a plurality of screw holes 11 penetrating the flange portion 10a are formed in a radially inward direction of the fixing bolt 8 of the flange portion 10a (see FIG. 2) with a phase shift relative to the fixing bolt 8 in the circumferential direction. Yes. A hexagon socket set screw 12 as a screw member is screwed into the screw hole 11, and the end of the set screw 12 on the housing 2 a side is rotated by rotating the set screw 12 in the axial direction. Is projected and retracted between the flange portion 10a and the housing 2a (the gap C 1 ). Then, the end face of the set screw 12 protruding from the flange portion 10a abuts against the end face of the housing 2a when the fixing bolt 8 is tightened to restrict further tightening.
[0011]
As is apparent from the above description, in the conventional structure, the internal axial gap C 2 of the bearing 3 acts as a preload on the bearing 3 by the amount tightened by the fixing bolt 8, so the amount of preload is the value of the gap C 2 . In this embodiment, the tightening of the fixing bolt 8 is regulated by the set screw 12 having a mounting pitch diameter smaller than the mounting pitch diameter of the fixing bolt 8. In addition, the preload beyond a certain level can be prevented from being applied, and the protruding length of the set screw 12 can be continuously adjusted, so that the amount of preload acting on the bearing 3 can be freely adjusted. As a result, the friction torque of the rotating shaft 1 is always stabilized by adjusting the tightening torque of the fixing bolt 8 and the set screw 12 or adjusting the preload amount while inspecting the pushing amount of the outer ring presser 10, for example. It is possible to maintain the adjusted value and efficiently transmit the rotational force. Further, it is possible to easily operate the rotating shaft 1 when it is necessary to turn the rotating shaft 1 by manual operation such as direct teaching.
[0012]
In this embodiment, the case where the set screw 12 is arranged with a mounting pitch diameter smaller than the mounting pitch diameter of the fixing bolt 8 is taken as an example. However, the present invention is not necessarily limited to this, and the set screw 12 is not necessarily limited thereto. May be disposed with a mounting pitch diameter larger than the mounting pitch diameter of the fixing bolt 8. However, when the set screw 12 is disposed with a smaller mounting pitch diameter than the mounting bolt diameter of the fixing bolt 8, the bearing 3 is more effectively fixed to the bearing 3 than when it is disposed with a larger mounting pitch diameter. It is possible to prevent the above preload from being applied.
[0013]
【Example】
3 and 4 show an example in which the above-described embodiment is applied to a bearing structure of a direct drive motor. FIG. 3 is an explanatory cross-sectional view for explaining an embodiment of the preload adjusting structure of the cross roller bearing, and FIG. 4 is a cross-sectional view at a position where the phase of FIG. 3 is shifted.
[0014]
As shown in FIG. 3, the cross roller bearing 30 is interposed between a rotor shaft 31 as a rotating shaft and a housing 32a. The inner ring 34 of the cross roller bearing 30 is fitted and fixed to the rotor shaft 31, and one side surface of the inner ring 34 is received by the shoulder 34 a of the rotor shaft 31, and the other side surface is pressed by the inner ring presser 36. Yes. The inner ring retainer 36 is fastened and fixed to the end of the rotor shaft 31 by a plurality of fixing bolts 35 arranged in the circumferential direction.
[0015]
The outer ring 37 is fitted and fixed to the housing 32 a, and one side surface of the outer ring 37 is received by the shoulder 37 a of the housing 32 a, and the other side surface is pressed in the axial direction by the outer ring presser 40. The outer ring retainer 40 is opposed to form a gap C 1 between the end face of the housing 32a, by tightening the ends of the housing 32a by a fixing bolt 38 having a plurality circumferentially disposed, the outer ring retainer The tool 40 presses the outer ring 37 in the axial direction so that a preload is applied to the bearing 30. In the figure, reference numeral 50 denotes a stator attached to the housing 32a.
[0016]
As shown in FIG. 4, a plurality of screw holes 41 penetrating the outer ring retainer 40 are formed in a radially inward direction of the fixing bolt 38 of the outer ring retainer 40 with a phase shifted relative to the fixing bolt 38 in the circumferential direction. Has been. A hexagon socket set screw 42 is screwed into the screw hole 41, and the end of the set screw 42 on the housing 32a side is rotated by moving the set screw 42 in the axial direction so that the outer ring presser It appears between 40 and the housing 32a (gap C 1 ). Then, the end face of the set screw 42 protruding from the outer ring presser 40 abuts against the end face of the housing 32a when the fixing bolt 38 is tightened to restrict further tightening. The method for adjusting the preload amount is the same as that in the above embodiment, and will not be described.
[0017]
Here, the starting friction torque becomes larger as the diameter of the cross roller bearing becomes larger, and the rotational torque to be transmitted is greatly lost. The starting friction torque of the direct drive motor of this embodiment was measured. However, the starting friction torque can be reduced to 1/5 compared with a conventional motor of the same type that does not have the preload adjusting structure of the present invention.
[0018]
【The invention's effect】
As is clear from the above description, according to the present invention, it is possible to prevent the bearing from being subjected to a preload exceeding a certain level, and the protruding length of the screw member can be continuously adjusted. The amount of preload acting can be adjusted freely. As a result, the friction torque of the rotating shaft can be maintained at a stable value at all times, and the rotating force can be transmitted efficiently, and it is easy to rotate the rotating shaft by manual operation such as direct teaching. Can be operated.
[Brief description of the drawings]
FIG. 1 is an explanatory sectional view for explaining a preload adjusting structure for a cross roller bearing which is an example of an embodiment of the present invention.
FIG. 2 is a view as seen from the direction of arrow II in FIG.
FIG. 3 is an explanatory cross-sectional view for explaining a preload adjusting structure for a cross roller bearing according to an embodiment of the present invention.
4 is a cross-sectional view at a position where a phase is shifted in FIG. 3;
FIG. 5 is an explanatory sectional view for explaining a preload adjusting structure of a conventional cross roller bearing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Rotating shaft 2a ... Housing 3 ... Cross-roller bearing 7 ... Outer ring 8 ... Fixing bolt 10 ... Outer ring presser 12 ... Hexagon socket set screw (screw member)

Claims (1)

回転軸の外周面に嵌合する内周面を有する内輪と、該内輪の外周に端面同士を対向させて設けられた二つの外輪と、該外輪の外周面に嵌合する内周面を有する円筒状のハウジングと、前記外輪を前記ハウジングの内周面に形成された肩部に押圧する外輪押え具と、該外輪押え具を前記ハウジングの端面に締め付け固定する複数の固定ボルトとを備え、前記回転軸の軸方向に貫通する複数のねじ孔を前記外輪押え具に前記ハウジングの周方向に配設し、該ねじ孔の各々にねじ部材をねじ込んで前記ハウジングの端面に前記ねじ部材の先端を当接させたクロスローラ軸受の予圧を調整する構造であって、前記ねじ孔が前記固定ボルトに対して位相をずらして前記外輪押え具に形成されているとともに、前記ねじ孔にねじ込まれたねじ部材が前記固定ボルトの取付ピッチ径よりも小径の取付ピッチ径で前記ハウジングの周方向に配設されていることを特徴とするクロスローラ軸受の予圧調整構造。An inner ring having an inner peripheral surface that fits to the outer peripheral surface of the rotating shaft, two outer rings provided with end surfaces facing each other on the outer periphery of the inner ring, and an inner peripheral surface that fits to the outer peripheral surface of the outer ring e Bei a cylindrical housing, and the outer ring retainer that presses the outer ring shoulder formed on the inner peripheral surface of the housing, and a plurality of fixed bolts tightened to fix the outer ring retainer to the end face of the housing , a plurality of screw holes extending in the axial direction of the front Symbol rotary shaft disposed in the circumferential direction of the housing to the outer ring retainer member, the screw member to the end face of the housing by screwing the screw member into each of the screw holes The preload of the cross roller bearing with which the tip of the cross roller is abutted is adjusted, wherein the screw hole is formed in the outer ring presser with a phase shifted with respect to the fixing bolt, and is screwed into the screw hole. The screw member Preload adjusting structure of the cross roller bearing, characterized in that than the mounting pitch diameter of the bolt is arranged in a circumferential direction of said housing in a small diameter of the mounting pitch diameter.
JP12190596A 1996-05-16 1996-05-16 Cross roller bearing preload adjustment structure Expired - Lifetime JP3855304B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12190596A JP3855304B2 (en) 1996-05-16 1996-05-16 Cross roller bearing preload adjustment structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12190596A JP3855304B2 (en) 1996-05-16 1996-05-16 Cross roller bearing preload adjustment structure

Publications (2)

Publication Number Publication Date
JPH09303385A JPH09303385A (en) 1997-11-25
JP3855304B2 true JP3855304B2 (en) 2006-12-06

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Family Applications (1)

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Publication number Priority date Publication date Assignee Title
JP4506028B2 (en) * 2001-05-08 2010-07-21 株式会社ジェイテクト Preload measuring method and preload measuring device for double row rolling bearing
JP4622195B2 (en) * 2001-09-07 2011-02-02 日本精工株式会社 Rotation support mechanism
JP5229530B2 (en) * 2007-09-07 2013-07-03 日本精工株式会社 Manufacturing method of electric motor
EP2607727A1 (en) * 2011-12-21 2013-06-26 Thales Nederland B.V. Pivot linkage device with bearings comprising means for protection against high voltage transients
JP5929677B2 (en) * 2012-10-01 2016-06-08 テクノダイナミックス株式会社 Bearing and cam device
JP6074736B2 (en) * 2012-10-01 2017-02-08 テクノダイナミックス株式会社 Cam device
JP5770763B2 (en) * 2013-02-26 2015-08-26 株式会社サンテック Measuring instrument
DE102015217323A1 (en) * 2015-09-10 2017-03-16 Aktiebolaget Skf Clamping device and method for preloading a bearing
DE102018120808A1 (en) * 2018-08-27 2020-02-27 Renk Aktiengesellschaft Bearing arrangement and adjusting screw for adjusting the bearing play
CN113865355B (en) * 2021-09-03 2024-01-16 甘肃光轩高端装备产业有限公司 Shaft difference adjuster, fixing assembly, traction roll shaft assembly and high-temperature furnace

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