JP6881003B2 - Polishing tools for tapered rollers, methods for polishing tapered rollers, and methods for manufacturing tapered roller bearings. - Google Patents

Polishing tools for tapered rollers, methods for polishing tapered rollers, and methods for manufacturing tapered roller bearings. Download PDF

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JP6881003B2
JP6881003B2 JP2017092961A JP2017092961A JP6881003B2 JP 6881003 B2 JP6881003 B2 JP 6881003B2 JP 2017092961 A JP2017092961 A JP 2017092961A JP 2017092961 A JP2017092961 A JP 2017092961A JP 6881003 B2 JP6881003 B2 JP 6881003B2
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tapered roller
diameter side
polishing
tapered
axial direction
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JP2018001398A (en
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博 山上
博 山上
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NSK Ltd
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Description

本発明は、円すいころに研磨加工を施すための円すいころ用研磨工具、及び、円すいころ用研磨工具を使用した円すいころの研磨方法、並びに、円すいころ軸受の製造方法に関する。 The present invention relates to a tapered roller polishing tool for polishing a tapered roller, a method for polishing a tapered roller using a tapered roller polishing tool, and a method for manufacturing a tapered roller bearing.

工作機械、産業機械などの回転機械のうち、大きなラジアル荷重及びスラスト荷重が加わる回転支持部分には、図9に示すような円すいころ軸受1が組み込まれている。円すいころ軸受1は、外輪2と、内輪3と、複数個の円すいころ4と、保持器5とを備える。外輪2は、内周面に部分円すい凹面状の外輪軌道6を有する。内輪3は、外輪2の内径側に外輪2と同軸に配置されており、外周面に部分円すい凸面状の内輪軌道7を有する。内輪3の大径側端部には、径方向外方に突出した大径側鍔部8が設けられており、内輪3の小径側端部には、径方向外方に突出した小径側鍔部9が設けられている。それぞれの円すいころ4は、転動面として機能する外周面を備え、円すいころ4の外周面の直径は、軸方向片端部から軸方向他端部に向けて漸次大きくなっている。なお、円すいころ4の軸方向片端部は尾部と称され、円すいころ4の軸方向他端部は頭部と称される。それぞれの円すいころ4は、軸方向片端面である小径側端面12と、軸方向他端面である大径側端面10とを備える。それぞれの円すいころ4は、外輪軌道6と内輪軌道7との間に、転動自在に配置された状態で、大径側端面10を、大径側鍔部8の内側面11に摺接させるとともに、小径側端面12を、小径側鍔部9の内側面13に隙間を介して対向させている。保持器5は、複数個の円すいころ4を保持している。 Among rotating machines such as machine tools and industrial machines, a tapered roller bearing 1 as shown in FIG. 9 is incorporated in a rotating support portion to which a large radial load and a thrust load are applied. The tapered roller bearing 1 includes an outer ring 2, an inner ring 3, a plurality of tapered rollers 4, and a cage 5. The outer ring 2 has a partially conical concave outer ring track 6 on the inner peripheral surface. The inner ring 3 is arranged coaxially with the outer ring 2 on the inner diameter side of the outer ring 2, and has a partially conical convex inner ring track 7 on the outer peripheral surface. The large-diameter side end of the inner ring 3 is provided with a large-diameter side flange 8 protruding outward in the radial direction, and the small-diameter side end of the inner ring 3 is provided with a small-diameter side flange protruding outward in the radial direction. A part 9 is provided. Each tapered roller 4 has an outer peripheral surface that functions as a rolling surface, and the diameter of the outer peripheral surface of the tapered roller 4 gradually increases from one end in the axial direction to the other end in the axial direction. One end of the tapered roller 4 in the axial direction is referred to as a tail, and the other end of the tapered roller 4 in the axial direction is referred to as a head. Each tapered roller 4 includes a small-diameter side end surface 12 which is one end surface in the axial direction and a large-diameter side end surface 10 which is the other end surface in the axial direction. Each tapered roller 4 is rotatably arranged between the outer ring track 6 and the inner ring track 7, and the large-diameter side end surface 10 is slidably contacted with the inner side surface 11 of the large-diameter side flange portion 8. At the same time, the small-diameter side end surface 12 is opposed to the inner side surface 13 of the small-diameter side flange portion 9 via a gap. The cage 5 holds a plurality of tapered rollers 4.

それぞれの円すいころ4の大径側端面10には、内輪3を構成する大径側鍔部8の内側面11との間の摺動抵抗を小さくするために、砥石による研磨加工が施されている。なお、研磨加工には、削り取る量が多い研削加工を含むものとする。円すいころの大径側端面に研磨加工を施す方法は、例えば特開2011−152597号公報に開示されている。 The large-diameter side end surface 10 of each tapered roller 4 is polished with a grindstone in order to reduce the sliding resistance between the large-diameter side end surface 10 and the inner side surface 11 of the large-diameter side flange portion 8 constituting the inner ring 3. There is. The polishing process includes a grinding process in which a large amount of scraping is performed. A method of polishing the large-diameter end face of a tapered roller is disclosed in, for example, Japanese Patent Application Laid-Open No. 2011-152597.

特開2011−152597号公報Japanese Unexamined Patent Publication No. 2011-152597

ただし、特開2011−152597号公報に開示された従来技術では、円すいころを1個ずつ研磨する必要がある。研磨後の円すいころは、必要に応じて洗浄などの処理が施された後、搬送用のトレーに入れられて組立工程に送られ、外輪、内輪及び保持器と組み合わされて円すいころ軸受を構成する。このため、円すいころ軸受を組み立てる前の、トレーによる搬送中に円すいころ同士がぶつかって、円すいころの大径側端面に傷などの損傷を生じる可能性がある。このような損傷が生じると、円すいころの大径側端面と、内輪の大径側鍔部の内側面との摺動抵抗が大きくなって、円すいころ軸受の回転トルクが増大したり、損傷の程度が著しい場合には、組立後の円すいころ軸受を不良品として廃棄する必要が生じたりする。なお、回転トルクの増大は、円すいころ軸受の回転数が500rpm以下の低回転領域で顕著になり易い。 However, in the prior art disclosed in Japanese Patent Application Laid-Open No. 2011-152597, it is necessary to polish the tapered rollers one by one. After polishing, the tapered rollers are cleaned as necessary, then placed in a transport tray and sent to the assembly process, where they are combined with outer rings, inner rings, and cages to form tapered roller bearings. To do. Therefore, before assembling the tapered roller bearings, the tapered rollers may collide with each other during transportation by the tray, causing damage such as scratches on the large diameter side end face of the tapered rollers. When such damage occurs, the sliding resistance between the large-diameter side end face of the tapered roller and the inner surface of the large-diameter side flange of the inner ring increases, and the rotational torque of the tapered roller bearing increases or damage occurs. If the degree is significant, it may be necessary to dispose of the assembled tapered roller bearing as a defective product. The increase in rotational torque tends to be remarkable in a low rotational speed region where the rotational speed of the tapered roller bearing is 500 rpm or less.

本発明は、上述のような事情に鑑み、円すいころ軸受の回転トルクの低減を図り易い、円すいころ用研磨工具の構造及び円すいころの研磨方法を実現することを目的としている。 In view of the above circumstances, it is an object of the present invention to realize a structure of a tapered roller polishing tool and a method for polishing tapered rollers, which can easily reduce the rotational torque of tapered roller bearings.

本発明の円すいころ用研磨工具及び円すいころの研磨方法の対象となる複数個の円すいころはそれぞれ、軸方向片側から軸方向他側に向かうに従って外径が大きくなる円すい台形状を有し、転動面である外周面と、軸方向片端面である小径側端面と、軸方向他端面である大径側端面とを備える。
複数個の円すいころは、外輪と、内輪と、保持器と組み合わされて円すいころ軸受を構成する。
前記外輪は、内周面に、軸方向片側から軸方向他側に向かうに従って内径が大きくなる方向に傾斜した部分円すい凹面状の外輪軌道を有する。
前記内輪は、前記外輪の内径側に該外輪と同軸に配置されており、外周面のうち、前記外輪軌道に対向する部分に設けられ、軸方向片側から軸方向他側に向かうに従って外径が大きくなる方向に傾斜した部分円すい凸面状の内輪軌道と、軸方向他端部である大径側端部に径方向外方に突出した状態で設けられた大径側鍔部とを有する。
前記保持器は、前記複数個の円すいころを保持するためのものである。
The tapered roller polishing tool and the plurality of tapered rollers that are the targets of the tapered roller polishing method of the present invention each have a conical trapezoidal shape in which the outer diameter increases from one side in the axial direction to the other side in the axial direction. It includes an outer peripheral surface that is a moving surface, a small diameter side end surface that is one end surface in the axial direction, and a large diameter side end surface that is the other end surface in the axial direction.
A plurality of tapered rollers are combined with an outer ring, an inner ring, and a cage to form a tapered roller bearing.
The outer ring has a partial conical concave outer ring track that is inclined in a direction in which the inner diameter increases from one side in the axial direction toward the other side in the axial direction on the inner peripheral surface.
The inner ring is arranged coaxially with the outer ring on the inner diameter side of the outer ring, and is provided on a portion of the outer peripheral surface facing the outer ring track, and the outer diameter increases from one side in the axial direction toward the other side in the axial direction. It has a partial conical convex inner ring track that is inclined in the increasing direction, and a large-diameter side flange portion that is provided at the large-diameter side end portion that is the other end in the axial direction so as to project outward in the radial direction.
The cage is for holding the plurality of tapered rollers.

本発明の円すいころ用研磨工具は、前記複数個の円すいころのそれぞれの大径側端面に研磨加工を施すためのものであり、内径側傾斜面部と、大径側鍔部相当部と、大径側端面研磨部とを備える。
前記内径側傾斜面部は、外周面に設けられ、かつ、軸方向片側から軸方向他側に向かうに従って外径が大きくなる方向に傾斜した部分円すい凸面状を有する。
前記大径側鍔部相当部は、軸方向他端部である大径側端部に径方向外方に突出した状態で設けられている。
前記大径側端面研磨部は、前記大径側鍔部相当部の軸方向片側面に設けられた、前記複数個の円すいころのそれぞれの前記大径側端面に研磨加工を施すための部分である。
The tapered roller polishing tool of the present invention is for polishing the large-diameter side end faces of the plurality of tapered rollers, and has a large inner diameter side inclined surface portion, a large diameter side flange portion corresponding portion, and a large portion. It is provided with a diameter-side end face polishing portion.
The inner diameter side inclined surface portion has a partial conical convex shape which is provided on the outer peripheral surface and is inclined in a direction in which the outer diameter increases from one side in the axial direction toward the other side in the axial direction.
The large-diameter side flange portion corresponding portion is provided at the large-diameter side end portion, which is the other end in the axial direction, in a state of protruding outward in the radial direction.
The large-diameter side end face polishing portion is a portion provided on one side surface in the axial direction of the portion corresponding to the large-diameter side flange portion for polishing the large-diameter side end face of each of the plurality of tapered rollers. is there.

本発明の円すいころ用研磨工具を実施する場合、前記内径側傾斜面部に設けられた、前記円すいころの転動面に研磨加工を施すための転動面研磨部をさらに備えることが好ましい。 When the tapered roller polishing tool of the present invention is carried out, it is preferable to further provide a rolling surface polishing portion provided on the inner diameter side inclined surface portion for polishing the rolling surface of the tapered roller.

本発明の円すいころの研磨方法では、上述のような本発明の円すいころ用研磨工具を使用して、1個の円すいころ軸受に組み込まれる1セットの円すいころに研磨加工を施す。具体的には、前記円すいころ用研磨工具の周囲に、前記円すいころ用研磨工具と同軸に、内周面に軸方向片側から軸方向他側に向かうに従って内径が大きくなる方向に傾斜した部分円すい凹面状の外径側傾斜面部を有する外径側部材を配置する。前記円すいころ用研磨工具の前記内径側傾斜面部と、前記外径側部材の前記外径側傾斜面部との間には、複数個の円すいころを保持器に保持した状態で転動自在に配置する。この状態で、前記1セットの円すいころを、前記内径側傾斜面部と前記外径側傾斜面部との間で軸方向に押圧しつつ、前記円すいころ用研磨工具と前記外径側部材とを相対回転させる。これにより、前記1セットの円すいころのそれぞれの少なくとも前記大径側端面、好ましくは、該大径側端面に加えて前記転動面に、研磨加工を施す。 In the tapered roller polishing method of the present invention, a set of tapered rollers incorporated in one tapered roller bearing is polished by using the tapered roller polishing tool of the present invention as described above. Specifically, a partial cone that is inclined around the tapered roller polishing tool in a direction in which the inner diameter increases from one axial side to the other axial direction on the inner peripheral surface coaxially with the tapered roller polishing tool. An outer diameter side member having a concave outer diameter side inclined surface portion is arranged. A plurality of tapered rollers are rotatably arranged between the inner diameter side inclined surface portion of the tapered roller polishing tool and the outer diameter side inclined surface portion of the outer diameter side member while being held by a cage. To do. In this state, while pressing the set of tapered rollers in the axial direction between the inner diameter side inclined surface portion and the outer diameter side inclined surface portion, the tapered roller polishing tool and the outer diameter side member are relative to each other. Rotate. As a result, at least the large-diameter side end face of each of the set of tapered rollers, preferably, the rolling surface in addition to the large-diameter side end face is polished.

上述のような本発明の円すいころの研磨方法を実施する場合には、前記円すいころ用研磨工具及び前記外径側部材の軸方向を鉛直方向に一致させるとともに、前記円すいころ用研磨工具を鉛直方向上側に配置し、前記外径側部材を鉛直方向下側に配置することが好ましい。ただし、前記円すいころ用研磨工具及び前記外径側部材の軸方向を鉛直方向に一致させるともに、前記円すいころ用研磨工具を鉛直方向下側に配置し、前記外径側部材を鉛直方向上側に配置することもできる。 When the method for polishing tapered rollers of the present invention as described above is carried out, the axial directions of the tapered roller polishing tool and the outer diameter side member are aligned with each other in the vertical direction, and the tapered roller polishing tool is vertically aligned. It is preferable that the outer diameter side member is arranged on the upper side in the direction and the outer diameter side member is arranged on the lower side in the vertical direction. However, the axial direction of the conical roller polishing tool and the outer diameter side member are aligned with each other in the vertical direction, the conical roller polishing tool is arranged on the lower side in the vertical direction, and the outer diameter side member is on the upper side in the vertical direction. It can also be placed.

本発明の円すいころ軸受の製造方法では、本発明の円すいころの研磨方法により研磨加工が施された1セットの円すいころを、外輪の内周面に設けられた外輪軌道と、内輪の外周面に設けられた内輪軌道との間に転動自在に配置して、円すいころ軸受を組み立てる。 In the method for manufacturing tapered roller bearings of the present invention, a set of tapered rollers polished by the method for polishing tapered rollers of the present invention is provided on the inner peripheral surface of the outer ring and the outer ring raceway and the outer peripheral surface of the inner ring. The tapered roller bearings are assembled by arranging them so that they can roll freely between them and the inner ring raceway provided in.

上述のような本発明の円すいころ用研磨工具及び円すいころの研磨方法によれば、1個の円すいころ軸受に組み込む1セットの円すいころを保持器に組み込んだ状態で、該1セットの円すいころにまとめて研磨加工を施すことができる。このため、複数個の円すいころに対して1個ずつ研磨加工を施す場合のように、研磨後の円すいころをトレーにより組立工程に搬送する必要がない。したがって、円すいころ軸受の組み立て前に、円すいころの大径側端面に傷などの損傷が生じることを防止できる。この結果、円すいころの大径側端面と、内輪の大径側鍔部の軸方向片側面との摺動抵抗を小さく抑え、前記円すいころ軸受の回転トルクの低減を図り易くできる。 According to the tapered roller polishing tool and the tapered roller polishing method of the present invention as described above, one set of tapered rollers to be incorporated in one tapered roller bearing is incorporated in a cage. It can be polished all at once. Therefore, unlike the case where a plurality of tapered rollers are polished one by one, it is not necessary to transport the polished tapered rollers to the assembly process by a tray. Therefore, it is possible to prevent damage such as scratches on the large diameter side end face of the tapered roller before assembling the tapered roller bearing. As a result, the sliding resistance between the large-diameter side end surface of the tapered roller and the axial one side surface of the large-diameter side flange portion of the inner ring can be suppressed to be small, and the rotational torque of the tapered roller bearing can be easily reduced.

図1(A)は、本発明の実施の形態の第1例の円すいころ用研磨工具を示す斜視図であり、図1(B)は、本発明の実施の形態の第1例の円すいころ用研磨工具を示す側面図であり、図1(C)は、図1(B)の下方から見た端面図であり、図1(D)は、図1(B)の上方から見た端面図である。FIG. 1 (A) is a perspective view showing a tapered roller polishing tool of the first example of the embodiment of the present invention, and FIG. 1 (B) is a tapered roller of the first example of the embodiment of the present invention. It is a side view which shows the polishing tool for use, FIG. 1 (C) is an end face view seen from the lower side of FIG. 1 (B), and FIG. 1 (D) is an end face seen from the upper side of FIG. 1 (B). It is a figure. 図2は、図1の(C)のX−X断面図である。FIG. 2 is a cross-sectional view taken along the line XX of FIG. 1 (C). 図3(A)は、本発明の実施の形態の第1例において、円すいころに研磨加工を施す方法を説明するための断面図であり、図3(B)は、図3(A)のY部拡大図である。FIG. 3 (A) is a cross-sectional view for explaining a method of polishing a tapered roller in the first example of the embodiment of the present invention, and FIG. 3 (B) is a cross-sectional view of FIG. 3 (A). It is an enlarged view of Y part. 図4は、本発明の実施の形態の第1例において、円すいころに研磨加工を施す方法の別例を示す断面図である。FIG. 4 is a cross-sectional view showing another example of a method of polishing a tapered roller in the first example of the embodiment of the present invention. 図5(A)は、本発明の実施の形態の第2例の円すいころ用研磨工具を示す斜視図であり、図5(B)は、本発明の実施の形態の第2例の円すいころ用研磨工具を示す側面図であり、図5(C)は、図5(B)の下方から見た端面図であり、図5(D)は、図5(B)の上方から見た端面図である。FIG. 5 (A) is a perspective view showing a polishing tool for tapered rollers of the second example of the embodiment of the present invention, and FIG. 5 (B) is a tapered roller of the second example of the embodiment of the present invention. It is a side view which shows the polishing tool for use, FIG. 5 (C) is an end face view seen from the lower side of FIG. 5 (B), and FIG. 5 (D) is an end face seen from the upper side of FIG. 5 (B). It is a figure. 図6は、本発明の実施の形態の第2例を示す、図2と同様の図である。FIG. 6 is a diagram similar to FIG. 2 showing a second example of the embodiment of the present invention. 図7は、本発明の実施の形態の第2例について、図3の(B)に相当する図である。FIG. 7 is a diagram corresponding to FIG. 3B for the second example of the embodiment of the present invention. 図8は、本発明の効果を確認するために行った実験の測定結果を示す図である。FIG. 8 is a diagram showing the measurement results of an experiment conducted to confirm the effect of the present invention. 図9は、本発明の研磨工具及び研磨方法の対象となる円すいころを組み込んだ円すいころ軸受の従来構造の1例を示す、部分切断斜視図である。FIG. 9 is a partially cut perspective view showing an example of a conventional structure of a tapered roller bearing incorporating a tapered roller which is a target of the polishing tool and the polishing method of the present invention.

[実施の形態の第1例]
図1〜図3は、本発明の実施の形態の第1例を示している。なお、本例を含め、本発明の特徴は、1個の円すいころ軸受1を構成する1セットの円すいころ4に、一度に研磨加工を施すための構造にある。円すいころ4それぞれの構成、及び、円すいころ4を組み込んだ円すいころ軸受1の構造は、基本的には、前述の図9に示した従来構造と同様である。すなわち、円すいころ軸受1は、外輪2と、内輪3と、複数個の円すいころ4と、保持器5とを備える。外輪2は、内周面に部分円すい凹面状の外輪軌道6を有する。内輪3は、外輪2の内径側にこの外輪2と同軸に配置されており、外周面に部分円すい凸面状の内輪軌道7を有する。内輪3の大径側端部には、径方向外方に突出した大径側鍔部8が設けられており、内輪3の小径側端部には、径方向外方に突出した小径側鍔部9が設けられている。それぞれの円すいころ4は、軸方向片側から軸方向他側に向かうに従って外径が大きくなる円すい台形状を有し、転動面である外周面と、軸方向片端面(円すいころ4の尾部側の端面)である小径側端面12と、軸方向他端面(円すいころ4の頭部側の端面)である大径側端面10とを備える。円すいころ4は、保持器5に保持された状態で、外輪軌道6と内輪軌道7との間に、転動自在に配置されている。この状態では、円すいころ4のそれぞれの大径側端面10が、大径側鍔部8の内側面11に摺接し、円すいころ4のそれぞれの小径側端面12が、小径側鍔部9の内側面13に隙間を介して対向する。
[First Example of Embodiment]
1 to 3 show a first example of an embodiment of the present invention. Including this example, the feature of the present invention is a structure for polishing one set of tapered rollers 4 constituting one tapered roller bearing 1 at a time. The configuration of each tapered roller 4 and the structure of the tapered roller bearing 1 incorporating the tapered roller 4 are basically the same as the conventional structure shown in FIG. 9 described above. That is, the tapered roller bearing 1 includes an outer ring 2, an inner ring 3, a plurality of tapered rollers 4, and a cage 5. The outer ring 2 has a partially conical concave outer ring track 6 on the inner peripheral surface. The inner ring 3 is arranged coaxially with the outer ring 2 on the inner diameter side of the outer ring 2, and has a partially conical convex inner ring track 7 on the outer peripheral surface. The large-diameter side end of the inner ring 3 is provided with a large-diameter side flange 8 protruding outward in the radial direction, and the small-diameter side end of the inner ring 3 is provided with a small-diameter side flange protruding outward in the radial direction. A part 9 is provided. Each tapered roller 4 has a conical trapezoidal shape in which the outer diameter increases from one side in the axial direction toward the other side in the axial direction, and has an outer peripheral surface which is a rolling surface and one end surface in the axial direction (the tail side of the tapered roller 4). The small-diameter side end surface 12 which is the end surface of the tapered roller 4) and the large-diameter side end surface 10 which is the other end surface in the axial direction (the end surface of the tapered roller 4 on the head side). The tapered roller 4 is rotatably arranged between the outer ring track 6 and the inner ring track 7 while being held by the cage 5. In this state, each large-diameter side end surface 10 of the tapered roller 4 is in sliding contact with the inner side surface 11 of the large-diameter side flange portion 8, and each small-diameter side end surface 12 of the tapered roller 4 is inside the small-diameter side flange portion 9. It faces the side surface 13 via a gap.

本例の円すいころ用研磨工具14は、1個の円すいころ軸受1を構成する1セットの円すいころ4の大径側端面10に、円すいころ4を保持器5aに組み込んだ状態でまとめて研磨加工を施すためのものである。円すいころ用研磨工具14は、全体を筒状に構成されており、軸方向中間部外周面に、軸方向片側(図1(A)、図1(B)、図2及び図3の上側)から軸方向他側(図1(A)、図1(B)、図2及び図3の下側)に向かう程外径が大きくなる方向に傾斜した部分円すい状で、特許請求の範囲に記載した傾斜面部に相当する内径側傾斜面部15を有している。円すいころ用研磨工具14の軸方向他端部である大径側端部には、径方向外方に突出した大径側鍔部相当部16が設けられており、円すいころ用研磨工具14の軸方向片端部である小径側端部には、軸方向に関して外径が変化しない小径側円筒面部17が設けられている。内径側傾斜面部15と、大径側鍔部相当部16の軸方向片側面との連続部には、逃げ凹部28が全周に亙り設けられている。 The tapered roller polishing tool 14 of this example collectively polishes the tapered roller 4 in a state of being incorporated in the cage 5a on the large-diameter side end surface 10 of a set of tapered rollers 4 constituting one tapered roller bearing 1. It is for processing. The tapered roller polishing tool 14 has a tubular shape as a whole, and has one side in the axial direction (upper side of FIGS. 1 (A), 1 (B), 2 and 3) on the outer peripheral surface of the intermediate portion in the axial direction. A partial conical shape that is inclined in a direction in which the outer diameter increases toward the other side in the axial direction (the lower side of FIGS. 1 (A), 1 (B), 2 and 3), and is described in the claims. It has an inner diameter side inclined surface portion 15 corresponding to the inclined surface portion. The large-diameter side end portion, which is the other end in the axial direction of the tapered roller polishing tool 14, is provided with a large-diameter side flange portion 16 protruding outward in the radial direction. A small diameter side cylindrical surface portion 17 whose outer diameter does not change with respect to the axial direction is provided at the small diameter side end portion which is one end portion in the axial direction. A relief recess 28 is provided all around the continuous portion between the inner diameter side inclined surface portion 15 and the axially one side surface of the large diameter side flange portion corresponding portion 16.

円すいころ用研磨工具14の大径側鍔部相当部16の軸方向片側面には、円すいころ4の大径側端面10に研磨加工を施すための大径側端面研磨部18が全周に亙って設けられている。本例では、円すいころ用研磨工具14は、軸受鋼などの硬質金属材料製の本体部分19と、砥石20とから構成されている。本体部分19は、全体を筒状に構成されており、軸方向中間部外周面に設けられた内径側傾斜面部15と、軸方向片端部に設けられた小径側円筒面部17と、内径側傾斜面部15の軸方向他側に隣接する部分に設けられた大径側円筒面部21と、軸方向他端部に径方向外方に全周にわたり突出した状態で設けられた鍔部30とを備える。鍔部30の軸方向片側面には、段部22が設けられている。砥石20は、断面略台形状で、全体を円環状に構成されており、軸方向片側面の形状を、内輪3の大径側鍔部8の軸方向片側面である内側面11の形状と同じにしている。砥石20は、円周方向に分割された、それぞれが部分円筒形である複数の砥石素子を組み合わせることにより、全体を円筒状に構成されている。砥石20は、軸方向他側面を段部22に突き当てることにより軸方向の位置決めを図った状態で、内周面が大径側円筒面部21に接着により外嵌固定されている。すなわち、本例では、砥石20と鍔部30とにより大径側鍔部相当部16が構成されており、砥石20の軸方向片側面により大径側端面研磨部18が構成されている。砥石20としては、例えば、ダイヤモンド系砥粒又は立方晶窒化ホウ素系砥粒をビリファイドボンドで結合した超砥粒超仕上砥石であって、粒度が#1200〜24000、結合度がH〜U、集中度が80〜180のものを使用できる。 On one side surface in the axial direction of the large-diameter side flange portion 16 of the tapered roller polishing tool 14, a large-diameter side end face polishing portion 18 for polishing the large-diameter side end surface 10 of the tapered roller 4 is provided all around. It is provided all over. In this example, the tapered roller polishing tool 14 is composed of a main body portion 19 made of a hard metal material such as bearing steel and a grindstone 20. The main body portion 19 is formed in a tubular shape as a whole, and has an inner diameter side inclined surface portion 15 provided on the outer peripheral surface of the intermediate portion in the axial direction, a small diameter side cylindrical surface portion 17 provided on one end portion in the axial direction, and an inner diameter side inclined portion 19. It is provided with a large-diameter cylindrical surface portion 21 provided on a portion of the surface portion 15 adjacent to the other side in the axial direction, and a flange portion 30 provided on the other end in the axial direction in a state of protruding outward in the radial direction over the entire circumference. .. A step portion 22 is provided on one side surface of the flange portion 30 in the axial direction. The grindstone 20 has a substantially trapezoidal cross section and is formed in an annular shape as a whole, and the shape of one side surface in the axial direction is the same as the shape of the inner side surface 11 which is one side surface in the axial direction of the large diameter side flange portion 8 of the inner ring 3. It's the same. The grindstone 20 is formed into a cylindrical shape as a whole by combining a plurality of grindstone elements, each of which is divided in the circumferential direction and has a partial cylindrical shape. The inner peripheral surface of the grindstone 20 is externally fitted and fixed to the large-diameter cylindrical surface portion 21 in a state where the other side surface in the axial direction is abutted against the step portion 22 to position the grindstone 20 in the axial direction. That is, in this example, the grindstone 20 and the flange portion 30 form a large-diameter side flange portion corresponding portion 16, and the axial one side surface of the grindstone 20 constitutes a large-diameter side end face polishing portion 18. The grindstone 20 is, for example, a super-abrasive super-finishing grindstone in which diamond-based grindstones or cubic boron nitride-based grindstones are bonded by a billid bond, and has a particle size of # 1200 to 24000 and a degree of coupling of H to U. Those with a concentration of 80 to 180 can be used.

本例の円すいころ用研磨工具14では、研磨加工の際に、円すいころ4の転動面と転がり接触する部分である内径側傾斜面部15の形状は、円すいころ軸受1を構成する内輪3の内輪軌道7の形状と同じとなっている。すなわち、円すいころ用研磨工具14の軸方向に対する内径側傾斜面部15の傾斜角度は、内輪3の軸方向に対する内輪軌道7の傾斜角度と同じであり、かつ、内径側傾斜面部15の軸方向寸法及び外径は、内輪3の内輪軌道7の軸方向寸法及び外径と同じとなっている。また、円すいころ4の大径側端面10と摺接する部分である大径側端面研磨部18の形状は、内輪3の大径側鍔部8の軸方向片側面の形状と同じとなっている。すなわち、円すいころ用研磨工具14の軸方向に直交する仮想平面に対する大径側端面研磨部18の傾斜角度は、内輪3の軸方向に直交する仮想平面に対する大径側鍔部8の内側面11の傾斜角度と同じとなっている。また、大径側端面研磨部18の外径は、大径側鍔部8の内側面11の外径と同じなっている。 In the tapered roller polishing tool 14 of this example, the shape of the inner diameter side inclined surface portion 15 which is a portion that makes rolling contact with the rolling surface of the tapered roller 4 during polishing is the shape of the inner ring 3 constituting the tapered roller bearing 1. It has the same shape as the inner ring track 7. That is, the inclination angle of the inner ring side inclined surface portion 15 with respect to the axial direction of the tapered roller polishing tool 14 is the same as the inclination angle of the inner ring track 7 with respect to the axial direction of the inner ring 3, and the axial dimension of the inner diameter side inclined surface portion 15. And the outer diameter are the same as the axial dimension and the outer diameter of the inner ring track 7 of the inner ring 3. Further, the shape of the large-diameter side end face polishing portion 18, which is a portion that is in sliding contact with the large-diameter side end face 10 of the tapered roller 4, is the same as the shape of one side surface in the axial direction of the large-diameter side flange portion 8 of the inner ring 3. .. That is, the inclination angle of the large-diameter side end face polishing portion 18 with respect to the virtual plane orthogonal to the axial direction of the conical roller polishing tool 14 is the inner surface 11 of the large-diameter side flange portion 8 with respect to the virtual plane orthogonal to the axial direction of the inner ring 3. It is the same as the tilt angle of. Further, the outer diameter of the large-diameter side end face polishing portion 18 is the same as the outer diameter of the inner side surface 11 of the large-diameter side flange portion 8.

上述のような本例の円すいころ用研磨工具14を使用して、1個の円すいころ軸受1を構成する1セットの円すいころ4の大径側端面10に研磨加工を施す方法について、図3を参照しつつ説明する。 FIG. 3 shows a method of polishing the large-diameter side end surface 10 of a set of tapered rollers 4 constituting one tapered roller bearing 1 by using the tapered roller polishing tool 14 of this example as described above. Will be explained with reference to.

まず、円すいころ用研磨工具14を、この円すいころ用研磨工具14の軸方向を鉛直方向に一致させるとともに、小径側端部が鉛直方向上方を向き、大径側端部が鉛直方向下方を向いた状態で回転テーブル23の上面に設置する。この状態で、回転テーブル23の上面に設けた凸部24の外周面を、円すいころ用研磨工具14の軸方向他端部内周面に、トルクの伝達を可能に内嵌することにより、円すいころ用研磨工具14を回転テーブル23により回転駆動可能とする。次に、円すいころ用研磨工具14の内径側傾斜面部15の周囲に、1個の円すいころ軸受1に組み込まれる1セットの円すいころ4が保持器5aに保持された状態で設置される。なお、円すいころ4の大径側端面10に研磨加工を施す以前の状態では、円すいころ4の大径側端面10は、曲率半径が大きい部分球面状の凸面である。次いで、円すいころ4の周囲に、円すいころ軸受1を構成する外輪2の内面形状と同じ内面形状を有する外径側部材25が、円すいころ用研磨工具14と同軸に配置される。すなわち、外径側部材25の内周面には、軸方向片側から他側に向かう程内径が大きくなる方向に傾斜した部分円すい状で、特許請求の範囲に記載した外側傾斜面部に相当する外径側傾斜面部26が設けられている。外径側部材25の軸方向に対する外径側傾斜面部26の傾斜角度は、外輪2の軸方向に対する外輪軌道6の傾斜角度と同じである。なお、上述の各工程は、矛盾を生じない範囲で、順番を入れ替えることができる。 First, the conical roller polishing tool 14 is aligned with the axial direction of the conical roller polishing tool 14 in the vertical direction, the small diameter side end faces upward in the vertical direction, and the large diameter side end faces downward in the vertical direction. It is installed on the upper surface of the rotary table 23 in the state where it is left. In this state, the outer peripheral surface of the convex portion 24 provided on the upper surface of the rotary table 23 is fitted inside the inner peripheral surface of the other end in the axial direction of the tapered roller polishing tool 14 so that torque can be transmitted. The polishing tool 14 can be rotationally driven by the rotary table 23. Next, a set of tapered rollers 4 incorporated in one tapered roller bearing 1 is installed around the inner diameter side inclined surface portion 15 of the tapered roller polishing tool 14 in a state of being held by the cage 5a. In the state before the large-diameter side end surface 10 of the tapered rollers 4 is polished, the large-diameter side end surface 10 of the tapered rollers 4 is a partially spherical convex surface having a large radius of curvature. Next, around the tapered roller 4, an outer diameter side member 25 having the same inner surface shape as the inner surface shape of the outer ring 2 constituting the tapered roller bearing 1 is arranged coaxially with the tapered roller polishing tool 14. That is, the inner peripheral surface of the outer diameter side member 25 has a partial conical shape inclined in a direction in which the inner diameter increases from one side in the axial direction toward the other side, and corresponds to the outer inclined surface portion described in the claims. A radial side inclined surface portion 26 is provided. The inclination angle of the outer diameter side inclined surface portion 26 with respect to the axial direction of the outer diameter side member 25 is the same as the inclination angle of the outer ring track 6 with respect to the axial direction of the outer ring 2. The order of each of the above steps can be changed as long as there is no contradiction.

上述のようにして、円すいころ用研磨工具14の内径側傾斜面部15と、外径側部材25の外径側傾斜面部26との間に、1セットの円すいころ4が、保持器5aにより保持された状態で転動自在に配置される。この状態で、外径側部材25が鉛直方向下方に押圧され、内径側傾斜面部15と外径側傾斜面部26との間で円すいころ4が軸方向に押圧される。円すいころ4に軸方向の押圧力が付与された状態で、回転テーブル23が回転駆動され、円すいころ用研磨工具14が回転駆動される。これにより、円すいころ4の大径側端面10のうち、円すいころ軸受1を構成した状態で、内輪3の大径側鍔部8の軸方向片側面と摺接する部分が、前記大径側端面研磨部18により研磨される。具体的には、例えば、円すいころ4の大径側端面10と、内輪3の大径側鍔部8の軸方向片側面との合成表面粗さσが、0.05μm以下となるように、円すいころ4のそれぞれの大径側端面10が研磨される。なお、合成表面粗さσは、円すいころ4の大径側端面10の二乗平均平方根粗さσと、内輪3の大径側鍔部8の軸方向片側面の二乗平均平方根粗さσとの二乗和平方根である。 As described above, one set of tapered rollers 4 is held by the cage 5a between the inner diameter side inclined surface portion 15 of the tapered roller polishing tool 14 and the outer diameter side inclined surface portion 26 of the outer diameter side member 25. It is arranged so that it can be rolled freely. In this state, the outer diameter side member 25 is pressed downward in the vertical direction, and the tapered roller 4 is pressed axially between the inner diameter side inclined surface portion 15 and the outer diameter side inclined surface portion 26. The rotary table 23 is rotationally driven and the tapered roller polishing tool 14 is rotationally driven in a state where the pressing force in the axial direction is applied to the tapered rollers 4. As a result, of the large-diameter side end faces 10 of the tapered rollers 4, the portion that is in sliding contact with one side surface of the large-diameter side flange portion 8 of the inner ring 3 in the axial direction in the state where the tapered roller bearing 1 is configured is the large-diameter side end face. It is polished by the polishing unit 18. Specifically, for example, the combined surface roughness σ of the large-diameter side end surface 10 of the tapered roller 4 and the axial one side surface of the large-diameter side flange portion 8 of the inner ring 3 is 0.05 μm or less. Each large diameter side end face 10 of the tapered roller 4 is polished. The composite surface roughness σ is the root mean square roughness σ 1 of the large-diameter side end face 10 of the cone 4 and the root mean square roughness σ 2 of one side surface of the large-diameter side flange 8 of the inner ring 3 in the axial direction. Is the root mean square of.

本例では、円すいころ4の大径側端面10に研磨加工を施している間中、内径側傾斜面部15と、前記外径側傾斜面部26との間の部分に、この部分の鉛直方向上側開口からクーラントが供給される。研磨後の円すいころ4は、1セットとして組み合わせたまま、必要に応じて洗浄などの処理を施された後、外輪2、内輪3及び保持器5と組み合わされて円すいころ軸受1を構成する。 In this example, while the large-diameter side end surface 10 of the tapered roller 4 is being polished, the portion between the inner diameter side inclined surface portion 15 and the outer diameter side inclined surface portion 26 is located on the upper side in the vertical direction of this portion. Coolant is supplied from the opening. The polished tapered rollers 4 are combined as a set and subjected to processing such as cleaning as necessary, and then combined with the outer ring 2, the inner ring 3, and the cage 5 to form the tapered roller bearing 1.

本例の円すいころ用研磨工具14を用いた円すいころの研磨方法によれば、1個の円すいころ軸受1に組み込む1セットの円すいころ4に、円すいころ4を保持器5aに組み込んだ状態で、まとめて研磨加工を施すことができる。このため、円すいころ4を円すいころ軸受1に組み込む直前に、円すいころ4の大径側端面10に研磨加工を施すことができる。要するに、円すいころ4に1個ずつ研磨加工を施す場合のように、研磨後の円すいころ4をトレーにより組立工程に搬送する必要がないため、円すいころ軸受1の組み立て前に、円すいころ4の大径側端面10に傷などの損傷が生じることを防止できる。この結果、円すいころ4の大径側端面10と、内輪3の大径側鍔部8の軸方向片側面との摺動抵抗を小さく抑え、円すいころ軸受1の回転トルクの低減を図り易い。また、円すいころ4の大径側端面10と、内輪3の大径側鍔部8の軸方向片側面との摺接部の初期なじみに要する時間を低減できる。 According to the method of polishing tapered rollers using the tapered roller polishing tool 14 of this example, the tapered rollers 4 are incorporated into a set of tapered rollers 4 incorporated into one tapered roller bearing 1, and the tapered rollers 4 are incorporated into a cage 5a. , Can be collectively polished. Therefore, immediately before the tapered roller 4 is incorporated into the tapered roller bearing 1, the large-diameter side end surface 10 of the tapered roller 4 can be polished. In short, unlike the case where each tapered roller 4 is polished one by one, it is not necessary to transport the polished tapered roller 4 to the assembly process by a tray. Therefore, before assembling the tapered roller bearing 1, the tapered roller 4 is used. It is possible to prevent damage such as scratches from occurring on the large-diameter side end surface 10. As a result, the sliding resistance between the large-diameter side end surface 10 of the tapered roller 4 and the axial one side surface of the large-diameter side flange portion 8 of the inner ring 3 can be suppressed to a small value, and the rotational torque of the tapered roller bearing 1 can be easily reduced. Further, it is possible to reduce the time required for the initial familiarization of the sliding contact portion between the large diameter side end surface 10 of the tapered roller 4 and the axial one side surface of the large diameter side flange portion 8 of the inner ring 3.

本例の円すいころ用研磨工具14では、内径側傾斜面部15の形状を、内輪3の内輪軌道7の形状と同じにするとともに、大径側鍔部相当部16の軸方向片側面の形状を、内輪3の大径側鍔部8の軸方向片側面の形状と同じとしている。このため、円すいころ4の大径側端面10のうち、内輪3の大径側鍔部8の軸方向片側面と摺接する部分を、組立後の円すいころ軸受1の摺接状態と同じ摺接状態を実現した状態で、効率良く研磨できる。 In the tapered roller polishing tool 14 of this example, the shape of the inner diameter side inclined surface portion 15 is the same as the shape of the inner ring track 7 of the inner ring 3, and the shape of one side surface in the axial direction of the large diameter side flange portion corresponding portion 16 is formed. , The shape of one side surface in the axial direction of the large diameter side flange portion 8 of the inner ring 3 is the same. Therefore, of the large-diameter side end faces 10 of the tapered rollers 4, the portion that is in sliding contact with one side surface of the large-diameter side flange portion 8 of the inner ring 3 in the axial direction is in the same sliding contact state as that of the tapered roller bearing 1 after assembly. It is possible to polish efficiently in the state where the state is realized.

なお、円すいころ4の大径側端面10に研磨加工を施す際に使用する、外径側部材25や保持器5aは、円すいころ軸受1を構成する外輪2や保持器5を使用することもできるし、研磨加工専用のものを使用することもできる。外径側部材25や保持器5aとして、円すいころ軸受1を構成する外輪2や保持器5を使用すれば、円すいころ軸受1の組立工程を簡略化できる。 As the outer diameter side member 25 and the cage 5a used when polishing the large diameter side end surface 10 of the tapered roller 4, the outer ring 2 and the cage 5 constituting the tapered roller bearing 1 may be used. It can be used, or it can be used exclusively for polishing. If the outer ring 2 and the cage 5 constituting the tapered roller bearing 1 are used as the outer diameter side member 25 and the cage 5a, the assembly process of the tapered roller bearing 1 can be simplified.

さらに、本例では、研磨加工の際に、円すいころ用研磨工具14を鉛直方向下方に配置し、外径側部材25を鉛直方向上方に配置して、円すいころ4の大径側端面10を大径側端面研磨部18に、鉛直方向上方から押し付けるようにしている。このため、大径側端面研磨部18が、円すいころ4の大径側端面10になじみ易い。さらに、研磨屑が、円すいころ4の転動面と、内径側傾斜面部15及び外径側傾斜面部26との転がり接触部に入り込みにくくできる。ただし、図4に示すように、円すいころ用研磨工具14を鉛直方向上方に配置し、外径側部材25を鉛直方向下方に配置することもできる。或いは、円すいころ用研磨工具の軸方向を水平方向に一致させるようにしても良い。 Further, in this example, during the polishing process, the conical roller polishing tool 14 is arranged vertically downward, the outer diameter side member 25 is arranged vertically upward, and the large diameter side end surface 10 of the conical roller 4 is arranged. It is pressed against the large-diameter side end face polishing portion 18 from above in the vertical direction. Therefore, the large-diameter side end face polishing portion 18 is easily adapted to the large-diameter side end face 10 of the tapered rollers 4. Further, the polishing debris can be prevented from entering the rolling contact portion between the rolling surface of the tapered roller 4 and the inner diameter side inclined surface portion 15 and the outer diameter side inclined surface portion 26. However, as shown in FIG. 4, the tapered roller polishing tool 14 may be arranged vertically upward, and the outer diameter side member 25 may be arranged vertically downward. Alternatively, the axial direction of the tapered roller polishing tool may be aligned with the horizontal direction.

[実施の形態の第2例]
図5〜図7は、本発明の実施の形態の第2例を示している。本例の円すいころ用研磨工具14aは、軸受鋼などの硬質金属材料製で円筒状の円筒状部材31に、円すいころ軸受1を構成する内輪3の外面形状と同じ外面形状を有する砥石20aを接着により外嵌固定することにより構成されている。砥石20aは、全体を筒状に構成されており、軸方向中間部外周面に設けられた内径側傾斜面部15aと、軸方向他端部である大径側端部に設けられ、径方向外方に突出した大径側鍔部相当部16aと、軸方向片端部である小径側端部に設けられ、径方向外方に突出した小径側鍔部相当部29とを備える。内径側傾斜面部15aは、軸方向片側から軸方向他側に向かうに従って外径が大きくなる方向に傾斜した部分円すい凸面状を有する。大径側鍔部相当部16aの軸方向片側面により大径側端面研磨部18aが構成されており、内径側傾斜面部15aにより、複数個の円すいころ4の転動面に研磨加工を施すための転動面研磨部27が構成されている。本例の円すいころ用研磨工具14aは、1個の円すいころ軸受1を構成する1セットの円すいころ4の大径側端面10に加え、転動面にも、まとめて研磨加工を施すことができる。
[Second Example of Embodiment]
5 to 7 show a second example of the embodiment of the present invention. In the tapered roller polishing tool 14a of this example, a grindstone 20a having the same outer surface shape as the outer surface shape of the inner ring 3 constituting the tapered roller bearing 1 is formed on a cylindrical member 31 made of a hard metal material such as bearing steel. It is configured by externally fitting and fixing by adhesion. The grindstone 20a is formed in a tubular shape as a whole, and is provided on the inner diameter side inclined surface portion 15a provided on the outer peripheral surface of the axial intermediate portion and the large diameter side end portion which is the other end portion in the axial direction. It is provided with a large-diameter side flange corresponding portion 16a protruding in the direction, and a small-diameter side flange corresponding portion 29 provided at the small-diameter side end portion which is one end in the axial direction and protruding outward in the radial direction. The inner diameter side inclined surface portion 15a has a partial conical convex shape inclined in a direction in which the outer diameter increases from one side in the axial direction toward the other side in the axial direction. The large-diameter side end face polishing portion 18a is formed by one side surface in the axial direction of the large-diameter side flange portion corresponding portion 16a, and the rolling surfaces of the plurality of tapered rollers 4 are polished by the inner diameter side inclined surface portion 15a. The rolling surface polishing portion 27 of the above is configured. In the tapered roller polishing tool 14a of this example, in addition to the large-diameter side end surface 10 of one set of tapered rollers 4 constituting one tapered roller bearing 1, the rolling surface can also be collectively polished. it can.

本例の円すいころ用研磨工具14aを使用して、円すいころ4に研磨加工を施す方法については、上述の実施の形態の第1例の場合と同様である。すなわち、円すいころ用研磨工具14aの内径側傾斜面部15aと、外径側部材25の外径側傾斜面部26(図4参照)との間に、円すいころ4が保持器5aにより保持された状態で転動自在に配置される。この状態で、外径側部材25が鉛直方向下方に押圧され、内径側傾斜面部15aと外径側傾斜面部26との間で円すいころ4が軸方向に押圧される。内径側傾斜面部15aと外径側傾斜面部26との間で円すいころ4に軸方向の押圧力が付与された状態で、円すいころ用研磨工具14aが回転駆動されて、円すいころ4の大径側端面10及び転動面に研磨加工が施される。 The method of polishing the tapered rollers 4 using the tapered roller polishing tool 14a of this example is the same as that of the first example of the above-described embodiment. That is, the tapered roller 4 is held by the cage 5a between the inner diameter side inclined surface portion 15a of the tapered roller polishing tool 14a and the outer diameter side inclined surface portion 26 (see FIG. 4) of the outer diameter side member 25. It is arranged so that it can be rolled freely. In this state, the outer diameter side member 25 is pressed downward in the vertical direction, and the tapered roller 4 is pressed axially between the inner diameter side inclined surface portion 15a and the outer diameter side inclined surface portion 26. With the axial pressing force applied to the tapered roller 4 between the inner diameter side inclined surface portion 15a and the outer diameter side inclined surface portion 26, the tapered roller polishing tool 14a is rotationally driven to drive the large diameter of the tapered roller 4. The side end surface 10 and the rolling surface are polished.

本例の円すいころ用研磨工具14aを使用した円すいころの研磨方法によれば、実施の形態の第1例と同様に、1セットの円すいころ4を1個の円すいころ軸受1に組み込む直前に、円すいころ4にまとめて研磨加工を施すことができる。したがって、研磨後の円すいころ4をトレーにより組立工程に搬送する必要がなく、円すいころ軸受1の組み立て前に、円すいころ4の大径側端面10に傷などの損傷が生じるのを防止できる。さらに、本例の円すいころ用研磨工具14aによれば、円すいころ4の大径側端面10に加えて、転動面にも研磨加工を施すことができる。このため、円すいころ4の転がり抵抗を小さく抑えることができて、円すいころ軸受1の回転トルクの低減を、より図り易くなる。さらに、円すいころ4の転動面と、外輪2の外輪軌道6及び内輪3の内輪軌道7との転がり接触部の初期なじみに要する時間の低減も図れる。 According to the method for polishing tapered rollers using the tapered roller polishing tool 14a of this example, immediately before incorporating one set of tapered rollers 4 into one tapered roller bearing 1 as in the first example of the embodiment. , Tapered rollers 4 can be collectively polished. Therefore, it is not necessary to transport the polished tapered roller 4 to the assembly process by the tray, and it is possible to prevent damage such as scratches on the large diameter side end surface 10 of the tapered roller 4 before assembling the tapered roller bearing 1. Further, according to the tapered roller polishing tool 14a of this example, in addition to the large diameter side end surface 10 of the tapered roller 4, the rolling surface can also be polished. Therefore, the rolling resistance of the tapered roller 4 can be suppressed to a small value, and it becomes easier to reduce the rotational torque of the tapered roller bearing 1. Further, it is possible to reduce the time required for the initial familiarization of the rolling contact portion between the rolling surface of the tapered roller 4 and the outer ring track 6 of the outer ring 2 and the inner ring track 7 of the inner ring 3.

本例では、1セットの円すいころ4の大径側端面10と転動面とにまとめて研磨加工を施すため、円すいころ4の転動面の形状、すなわち、大径側端面10を基準とした軸方向位置が同じである場合の転動面の外径のばらつきを小さく抑えられる。したがって、円すいころ4を円すいころ軸受1に組み込んだ場合に、円すいころ4の転動面と、外輪2の外輪軌道6及び内輪3の内輪軌道7との転がり接触部の接触面圧を安定させられる。ただし、本例のように、1セットの円すいころ4の大径側端面10と転動面とにまとめて研磨加工を施す場合には、研磨加工後の円すいころ4の形状が所望のものとなるように、大径側端面10及び転動面のそれぞれについて、前工程である粗研削における研削量と、研磨加工における研磨量とを適切に調整する。その他の部分の構成及び作用については、実施の形態の第1例と同様である。 In this example, since the large-diameter side end surface 10 and the rolling surface of one set of tapered rollers 4 are collectively polished, the shape of the rolling surface of the tapered rollers 4, that is, the large-diameter side end surface 10 is used as a reference. When the axial positions are the same, the variation in the outer diameter of the rolling surface can be suppressed to a small extent. Therefore, when the tapered roller 4 is incorporated into the tapered roller bearing 1, the contact surface pressure between the rolling surface of the tapered roller 4 and the rolling contact portion between the outer ring track 6 of the outer ring 2 and the inner ring track 7 of the inner ring 3 is stabilized. Be done. However, as in this example, when polishing the large-diameter side end surface 10 and the rolling surface of one set of tapered rollers 4 together, the shape of the tapered rollers 4 after the polishing process is desired. Therefore, for each of the large-diameter side end face 10 and the rolling surface, the amount of grinding in the rough grinding, which is the previous process, and the amount of polishing in the polishing process are appropriately adjusted. The configuration and operation of other parts are the same as those of the first example of the embodiment.

本発明の効果を確認するために行った実験について説明する。実験では、実施例1及び実施例2と、比較例との3種類の試料について、回転トルクの大きさを求める実験を行った。実施例1及び実施例2に係る円すいころ軸受1に組み込まれた円すいころ4の大径側端面10には、前述の図4に示す、本発明の円すいころの研磨方法により、研磨加工が施されている。一方、比較例に係る円すいころ軸受1に組み込まれた円すいころ4の大径側端面10には、研磨加工は施されていない。すなわち、比較例は、研磨前の円すいころ4を、組立工程への搬送により大径側端面に傷などの損傷が発生した状態と仮定した例である。各試料の諸元は、以下のとおりである。 An experiment conducted to confirm the effect of the present invention will be described. In the experiment, the magnitude of the rotational torque was determined for three types of samples, Example 1 and Example 2 and Comparative Example. The large-diameter side end surface 10 of the tapered roller 4 incorporated in the tapered roller bearing 1 according to the first and second embodiments is polished by the tapered roller polishing method of the present invention shown in FIG. 4 described above. Has been done. On the other hand, the large-diameter side end surface 10 of the tapered roller 4 incorporated in the tapered roller bearing 1 according to the comparative example is not polished. That is, the comparative example is an example in which the tapered roller 4 before polishing is assumed to be in a state where damage such as scratches is generated on the end face on the large diameter side due to transportation to the assembly process. The specifications of each sample are as follows.

「すべての試料で共通する条件」
呼び番号 :HR32008XJ
外径 :68[mm]
内径 :40[mm]
幅 :19[mm]
円すいころの大径側端部の直径:7.038[mm]
接触角 :28°20’
内輪3の大径側鍔部8の軸方向片側面の二乗平均平方根粗さ:0.065[μm]
「大径側端面10の研磨条件」
(実施例1)
砥石20の種類:ダイヤモンド系ビトリファイド
砥石20の粒度:#12000
押圧力F :2.2[kN]
回転テーブル23の回転速度:125[min−1
加工時間 :3.4[秒]
(実施例2)
砥石20の種類:ダイヤモンド系ビトリファイド
砥石20の粒度:#12000
押圧力F :0.5[kN]
回転テーブル23の回転速度:125[min−1
加工時間 :15[秒]
"Conditions common to all samples"
Nominal number: HR32008XJ
Outer diameter: 68 [mm]
Inner diameter: 40 [mm]
Width: 19 [mm]
Diameter of the large diameter side end of the tapered roller: 7.038 [mm]
Contact angle: 28 ° 20'
Root mean square roughness of one side surface of the large diameter side flange 8 of the inner ring 3 in the axial direction: 0.065 [μm]
"Polishing conditions for large diameter side end face 10"
(Example 1)
Type of grindstone 20: Diamond-based vitrified grindstone 20 particle size: # 12000
Pressing pressure F: 2.2 [kN]
Rotation speed of rotary table 23: 125 [min -1 ]
Processing time: 3.4 [seconds]
(Example 2)
Type of grindstone 20: Diamond-based vitrified grindstone 20 particle size: # 12000
Pressing pressure F: 0.5 [kN]
Rotation speed of rotary table 23: 125 [min -1 ]
Processing time: 15 [seconds]

上記条件により、研磨加工を施したところ、円すいころ4の大径側端面10の算術平均表面粗さRaは、実施例1では0.018[μm]であり、実施例2では0.026[μm]であった。一方、比較例では、円すいころ4の大径側端面10の算術平均表面粗さRaは、0.07[μm]であった。 When polishing was performed under the above conditions, the arithmetic mean surface roughness Ra of the large-diameter side end face 10 of the tapered rollers 4 was 0.018 [μm] in Example 1 and 0.026 [μm] in Example 2. μm]. On the other hand, in the comparative example, the arithmetic mean surface roughness Ra of the large diameter side end surface 10 of the tapered rollers 4 was 0.07 [μm].

それぞれが上述のような使用を有する3種類の円すいころ軸受1は、外輪2の回転が阻止された状態で実験装置に組み込まれる。本実験では、内輪3に4[kN]のアキシャル荷重を付加した状態で、内輪3の回転速度を変化させつつ、内輪3の回転トルクがロードセルにて連続的に測定される。なお、内輪3を回転させている間中、外輪2の内周面と内輪3の外周面との間の空間には、十分量の潤滑油が貫流している。潤滑油の種類、油温及び流量については、以下の通りである。
潤滑油の種類:出光興産株式会社製ダフニーメカニックオイル VG32
油温 :58±1[度]
流量 :1.0[l/min]
The three types of tapered roller bearings 1, each having the above-mentioned uses, are incorporated into the experimental apparatus in a state where the rotation of the outer ring 2 is blocked. In this experiment, the rotational torque of the inner ring 3 is continuously measured by the load cell while changing the rotational speed of the inner ring 3 with an axial load of 4 [kN] applied to the inner ring 3. While the inner ring 3 is being rotated, a sufficient amount of lubricating oil is flowing through the space between the inner peripheral surface of the outer ring 2 and the outer peripheral surface of the inner ring 3. The types of lubricating oil, oil temperature and flow rate are as follows.
Lubricating oil type: Idemitsu Kosan Co., Ltd. Daphne mechanic oil VG32
Oil temperature: 58 ± 1 [degree]
Flow rate: 1.0 [l / min]

図8は、内輪3の回転トルクを試料毎に示している。図8から明らかなとおり、内輪3の回転速度が500[min−1]以下である低回転領域では、実施例1及び実施例2の方が比較例よりも内輪3の回転トルクを低減できている。具体的には、例えば、内輪3の回転速度が250[min−1]である場合の回転トルクは、実施例1及び実施例2では何れも0.13[Nm]であるのに対し、比較例では0.19[Nm]である。 FIG. 8 shows the rotational torque of the inner ring 3 for each sample. As is clear from FIG. 8, in the low rotation region where the rotation speed of the inner ring 3 is 500 [min -1 ] or less, the rotation torque of the inner ring 3 can be reduced in the first and second embodiments as compared with the comparative example. There is. Specifically, for example, the rotational torque when the rotational speed of the inner ring 3 is 250 [min -1 ] is 0.13 [Nm] in both Example 1 and Example 2, whereas in comparison. In the example, it is 0.19 [Nm].

本発明の対象となる円すいころは、前述の図9に示すようなラジアル円すいころ軸受に限らず、スラスト円すいころ軸受に組み込んで使用することもできる。 The tapered roller bearing which is the object of the present invention is not limited to the radial tapered roller bearing as shown in FIG. 9 described above, and can be used by being incorporated in a thrust tapered roller bearing.

1 円すいころ軸受
2 外輪
3 内輪
4 円すいころ
5、5a 保持器
6 外輪軌道
7 内輪軌道
8 大径側鍔部
9 小径側鍔部
10 大径側端面
11 内側面
12 小径側端面
13 内側面
14、14a 円すいころ用研磨工具
15、15a 内径側傾斜面部
16、16a 大径側鍔部相当部
17 小径側円筒面部
18、18a 大径側端面研磨部
19 本体部分
20、20a 砥石
21 大径側円筒面部
22 段部
23 回転テーブル
24 凸部
25 外径側部材
26 外径側傾斜面部
27 転動面研磨部
28 逃げ凹部
29 小径側鍔部相当部
30 鍔部
31 円筒状部材
1 Tapered roller bearing 2 Outer ring 3 Inner ring 4 Tapered roller 5, 5a Cage 6 Outer ring track 7 Inner ring track 8 Large diameter side flange 9 Small diameter side flange 10 Large diameter side end face 11 Inner side surface 12 Small diameter side end face 13 Inner side surface 14, 14a Tapered roller polishing tools 15, 15a Inner diameter side inclined surface part 16, 16a Large diameter side flange part equivalent 17 Small diameter side cylindrical surface part 18, 18a Large diameter side end surface polishing part 19 Main body part 20, 20a Grinding stone 21 Large diameter side cylindrical surface part 22 Steps 23 Rotating table 24 Convex 25 Outer diameter side member 26 Outer diameter side inclined surface part 27 Rolling surface polishing part 28 Relief recess 29 Small diameter side flange part Equivalent part 30 Tapered member 31 Cylindrical member

Claims (5)

複数個の円すいころの大径側端面に研磨加工を施すための円すいころ用研磨工具であって、
外周面に設けられ、かつ、軸方向片側から軸方向他側に向かうに従って外径が大きくなる方向に傾斜した部分円すい状の傾斜面部と、
軸方向他端部に径方向外方に突出した状態で設けられた大径側鍔部相当部と、
該大径側鍔部相当部の軸方向片側面に設けられた、前記円すいころの前記大径側端面に研磨加工を施すための大径側端面研磨部とを備える
円すいころ用研磨工具。
A tapered roller polishing tool for polishing the large-diameter end faces of multiple tapered rollers.
A conical inclined surface portion provided on the outer peripheral surface and inclined in a direction in which the outer diameter increases from one side in the axial direction toward the other side in the axial direction.
A large-diameter side flange equivalent portion provided at the other end in the axial direction in a state of protruding outward in the radial direction,
A tapered roller polishing tool provided with a large-diameter side end face polishing portion for polishing the large-diameter side end face of the tapered roller, which is provided on one side surface in the axial direction of the large-diameter side flange portion corresponding portion.
前記傾斜面部に設けられた、前記円すいころの転動面に研磨加工を施すための転動面研磨部をさらに備える、請求項1に記載した円すいころ用研磨工具。 The polishing tool for tapered rollers according to claim 1, further comprising a rolling surface polishing portion provided on the inclined surface portion for polishing the rolling surface of the tapered roller. 請求項1〜2のうちの何れか1項に記載の円すいころ用研磨工具を使用して、1個の円すいころ軸受に組み込まれる1セットの円すいころに研磨加工を施す、円すいころの研磨方法であって、
前記円すいころ研磨工具の周囲に、該円すいころ用研磨工具と同軸に、内周面に軸方向片側から軸方向他側に向かうに従って内径が大きくなる方向に傾斜した部分円すい状の外側傾斜面部を有する外径側部材を配置し、
前記円すいころ用研磨工具の前記傾斜面部と、前記外径側部材の前記外側傾斜面部との間に、複数個の円すいころを保持器に保持した状態で転動自在に配置し、
前記1セットの円すいころを、前記傾斜面部と前記外側傾斜面部との間で軸方向に押圧しつつ、前記1セットの円すいころ用研磨工具と前記外径側部材とを相対回転させることにより、前記円すいころに研磨加工を施す、円すいころの研磨方法。
A method for polishing tapered rollers, which uses the tapered roller polishing tool according to any one of claims 1 to 2 to polish a set of tapered rollers incorporated in one tapered roller bearing. And
Around the tapered roller polishing tool, a partial conical outer inclined surface portion inclined in a direction in which the inner diameter increases from one side in the axial direction to the other side in the axial direction on the inner peripheral surface coaxially with the tapered roller polishing tool. Place the outer diameter side member to have
A plurality of tapered rollers are rotatably arranged between the inclined surface portion of the tapered roller polishing tool and the outer inclined surface portion of the outer diameter side member while being held by a cage.
By pressing the set of tapered rollers in the axial direction between the inclined surface portion and the outer inclined surface portion, the tapered roller polishing tool and the outer diameter side member are relatively rotated. A method for polishing tapered rollers, in which the tapered rollers are polished.
前記円すいころ用研磨工具及び前記外径側部材の軸方向を鉛直方向に一致させるとともに、前記円すいころ用研磨工具を鉛直方向上側に配置し、前記外径側部材を鉛直方向下側に配置する、請求項3に記載した円すいころの研磨方法。 The axial direction of the conical roller polishing tool and the outer diameter side member is aligned with the vertical direction, the conical roller polishing tool is arranged on the upper side in the vertical direction, and the outer diameter side member is arranged on the lower side in the vertical direction. , The method for polishing a cone according to claim 3. 請求項3〜4のうちの何れか1項に記載の円すいころの研磨方法により研磨加工が施された1セットの円すいころを、外輪の内周面に設けられた外輪軌道と、内輪の外周面に設けられた内輪軌道との間に転動自在に配置して、円すいころ軸受を組み立てる、円すいころ軸受の製造方法。 A set of tapered rollers that have been polished by the tapered roller polishing method according to any one of claims 3 to 4 is provided with an outer ring track provided on the inner peripheral surface of the outer ring and an outer circumference of the inner ring. A method for manufacturing tapered roller bearings, in which tapered roller bearings are assembled by arranging them so that they can roll freely between them and the inner ring raceway provided on the surface.
JP2017092961A 2016-06-24 2017-05-09 Polishing tools for tapered rollers, methods for polishing tapered rollers, and methods for manufacturing tapered roller bearings. Active JP6881003B2 (en)

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