JP7020366B2 - Universal joint - Google Patents

Universal joint Download PDF

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JP7020366B2
JP7020366B2 JP2018197869A JP2018197869A JP7020366B2 JP 7020366 B2 JP7020366 B2 JP 7020366B2 JP 2018197869 A JP2018197869 A JP 2018197869A JP 2018197869 A JP2018197869 A JP 2018197869A JP 7020366 B2 JP7020366 B2 JP 7020366B2
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boot
joint member
folded
universal joint
outer joint
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JP2020063838A (en
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茂 西山
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Toyota Motor Corp
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Toyota Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Description

本発明は、自在継手に関する。 The present invention relates to a universal joint.

特許文献１には、自在継手（ジョイント）内部への異物の侵入と自在継手内部からのグリースの漏出を防止するために、外側継手部材の開口端部の外周側にブーツの端部を配置し、当該ブーツの端部をブーツバンドによって締め付けることにより、ブーツを外側継手部材に固定する自在継手の構造が開示されている。 In Patent Document 1, in order to prevent foreign matter from entering the inside of the universal joint (joint) and leakage of grease from the inside of the universal joint, the end of the boot is arranged on the outer peripheral side of the open end of the outer joint member. Disclosed is a structure of a universal joint that secures a boot to an outer joint member by tightening the end of the boot with a boot band.

特開２０１８－１０５３８３号公報Japanese Unexamined Patent Publication No. 2018-105383

特許文献１で開示された自在継手では、ブーツの端部が、外側継手部材の開口端部の外周側にブーツバンドにより締め付け固定されているため、例えば外的要因（例えば飛び石等）等によってブーツバンドの締付力が低下すると、ブーツ締結面のシール性が低下し、グリースが漏出するおそれがあった。 In the universal joint disclosed in Patent Document 1, since the end portion of the boot is fastened and fixed to the outer peripheral side of the open end portion of the outer joint member by a boot band, for example, the boot is caused by an external factor (for example, a stepping stone or the like). When the tightening force of the band is lowered, the sealing property of the boot fastening surface is lowered, and there is a possibility that grease may leak.

本発明は、上記に鑑みてなされたものであって、ブーツ締結面のシール性を確保しつつ、ブーツを外側継手部材に強固に固定することができる自在継手を提供することを目的とする。 The present invention has been made in view of the above, and an object of the present invention is to provide a universal joint capable of firmly fixing a boot to an outer joint member while ensuring a sealing property of a boot fastening surface.

上述した課題を解決し、目的を達成するために、本発明に係る自在継手は、外側継手部材と、前記外側継手部材との間でトルク伝達部材を介して角度変異を許容しながら回転トルクを伝達する内側継手部材と、前記外側継手部材に固定されるブーツと、を備える自在継手において、前記外側継手部材の開口端部における内周側に形成された断面コの字状の環状溝と、前記ブーツの端部に形成され、前記環状溝に嵌合する折返部であって、前記ブーツの外径側に突出し、かつ前記ブーツの端部とは逆側に折り返された折返部と、前記折返部に挿入され、前記折返部に対して外径方向および軸方向の押付力を付与することにより、前記ブーツを前記外側継手部材に固定する固定部材と、を有することを特徴とする。 In order to solve the above-mentioned problems and achieve the object, the universal joint according to the present invention applies rotational torque while allowing an angle variation between the outer joint member and the outer joint member via a torque transmission member. In a universal joint comprising a transmission inner joint member and a boot fixed to the outer joint member, a U-shaped annular groove formed on the inner peripheral side of the open end of the outer joint member. A folded portion formed at the end of the boot and fitted into the annular groove, which protrudes toward the outer diameter side of the boot and is folded back to the side opposite to the end of the boot, and the folded portion. It is characterized by having a fixing member which is inserted into the folded-back portion and fixes the boot to the outer joint member by applying a pressing force in the outer radial direction and the axial direction to the folded-back portion.

これにより、本発明に係る自在継手は、固定部材が外側に露出しない状態で、ブーツが外側継手部材の内周側に固定されるため、外的要因等により固定部材の固定力が低下することが抑制される。また、本発明に係る自在継手は、固定部材が折返部に対して外径方向および軸方向の押付力を付与するため、外側継手部材とブーツとが、二面（環状溝と折返部とが軸方向で接触する面、環状溝と折返部とが径方向で接触する面）でシールされ、シール性が向上する。 As a result, in the universal joint according to the present invention, the boot is fixed to the inner peripheral side of the outer joint member in a state where the fixing member is not exposed to the outside, so that the fixing force of the fixing member is reduced due to an external factor or the like. Is suppressed. Further, in the universal joint according to the present invention, since the fixing member applies a pressing force in the outer diameter direction and the axial direction to the folded portion, the outer joint member and the boot have two surfaces (an annular groove and the folded portion). It is sealed by a surface that contacts in the axial direction and a surface that contacts the annular groove and the folded portion in the radial direction), and the sealing property is improved.

本発明に係る自在継手によれば、ブーツ締結面のシール性を確保しつつ、ブーツを外側継手部材に強固に固定することができる。 According to the universal joint according to the present invention, the boot can be firmly fixed to the outer joint member while ensuring the sealing property of the boot fastening surface.

図１は、本発明の実施形態に係る自在継手の構成を示す部分断面図である。FIG. 1 is a partial cross-sectional view showing the configuration of a universal joint according to an embodiment of the present invention. 図２は、図１の一部を拡大した拡大断面図である。FIG. 2 is an enlarged cross-sectional view of a part of FIG. 1. 図３は、本発明の実施形態に係る自在継手において、折返部の変形例を示す拡大断面図である。FIG. 3 is an enlarged cross-sectional view showing a modified example of the folded portion in the universal joint according to the embodiment of the present invention.

本発明の実施形態に係る自在継手について、図面を参照しながら説明する。なお、本発明は以下の実施形態に限定されるものではない。また、下記実施形態における構成要素には、当業者が置換可能かつ容易なもの、あるいは実質的に同一のものが含まれる。 The universal joint according to the embodiment of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments. In addition, the components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same.

本実施形態に係る自在継手１の構成について、図１および図２を参照しながら説明する。自在継手１は、車両の前輪用または後輪用のドライブシャフトに連結される等速自在継手である。自在継手１は、ツェッパ型等速自在継手やアンダーカットフリー型等速自在継手等の固定式等速自在継手、トリポード型やダブルオフセット型、クロスグルーブ型等速自在継手等の摺動式等速自在継手に適用可能である。 The configuration of the universal joint 1 according to the present embodiment will be described with reference to FIGS. 1 and 2. The universal joint 1 is a constant velocity universal joint connected to a drive shaft for front wheels or rear wheels of a vehicle. The universal joint 1 is a fixed constant velocity universal joint such as a zepper type constant velocity universal joint or an undercut-free constant velocity universal joint, a tripod type, a double offset type, a cross groove type constant velocity universal joint, or the like. Applicable to universal joints.

自在継手１は、外側継手部材１１と、内側継手部材１２と、トルク伝達部材１３と、ブーツ１４と、を備えている。外側継手部材１１は、カップ状に形成されており、内部に内側継手部材１２、トルク伝達部材１３およびシャフト１５の一部が配置されている。 The universal joint 1 includes an outer joint member 11, an inner joint member 12, a torque transmission member 13, and a boot 14. The outer joint member 11 is formed in a cup shape, and a part of the inner joint member 12, the torque transmission member 13, and the shaft 15 is arranged inside.

内側継手部材１２は、トルク伝達部材（ボール）１３を回転自在に保持している。内側継手部材１２は、外側継手部材１１との間で、トルク伝達部材１３を介して角度変異を許容しながら回転トルクを伝達する。内側継手部材１２には、シャフト１５の一端が、スプライン嵌合によりトルク伝達可能に連結されている。 The inner joint member 12 rotatably holds the torque transmission member (ball) 13. The inner joint member 12 transmits rotational torque to and from the outer joint member 11 while allowing an angle variation via the torque transmission member 13. One end of the shaft 15 is connected to the inner joint member 12 so as to be able to transmit torque by spline fitting.

トルク伝達部材１３は、外側継手部材１１と内側継手部材１２との間に介在して回転トルクを伝達する。トルク伝達部材１３は、内側継手部材１２の内部に設けられたケージ１２１によって保持される。なお、トルク伝達部材１３の個数は任意であり、二つ以上設けてもよい。 The torque transmission member 13 is interposed between the outer joint member 11 and the inner joint member 12 to transmit rotational torque. The torque transmission member 13 is held by a cage 121 provided inside the inner joint member 12. The number of torque transmission members 13 is arbitrary, and two or more may be provided.

ブーツ１４は、一端側がシャフト１５に固定されており、他端側が外側継手部材１１に固定されている。ブーツ１４は、具体的には、シャフト１５の外周面にブーツバンド１６によって締め付け固定された小径端部１４ａと、外側継手部材１１の開口端部に固定された大径端部１４ｂと、小径端部１４ａから大径端部１４ｂに向けて拡径した伸縮自在な蛇腹部１４ｃと、から構成されている。ブーツ１４の内部は密封されており、当該内部には、潤滑剤としてのグリースが封入されている。 One end side of the boot 14 is fixed to the shaft 15, and the other end side is fixed to the outer joint member 11. Specifically, the boot 14 has a small diameter end portion 14a fastened and fixed to the outer peripheral surface of the shaft 15 by a boot band 16, a large diameter end portion 14b fixed to the open end portion of the outer joint member 11, and a small diameter end portion. It is composed of a stretchable bellows portion 14c whose diameter is expanded from the portion 14a toward the large-diameter end portion 14b. The inside of the boot 14 is sealed, and grease as a lubricant is sealed in the inside.

ブーツ１４は、例えば、エステル系、オレフィン系、ウレタン系、アミド系、スチレン系等の熱可塑性エラストマー等の樹脂素材や、クロロプレンゴム、シリコンゴム等のゴム素材により構成することができる。 The boot 14 can be made of, for example, a resin material such as an ester-based, olefin-based, urethane-based, amide-based, or styrene-based thermoplastic elastomer, or a rubber material such as chloroprene rubber or silicon rubber.

ここで、前記したように、従来の自在継手では、ブーツの大径端部が、外側継手部材の開口端部の外周側にブーツバンドにより締め付け固定されている。そのため、例えば車両の走行中の飛び石等の外的要因によりブーツバンドの締付力が低下すると、ブーツ締結面のシール性が低下し、グリースが漏出するおそれがあった。 Here, as described above, in the conventional universal joint, the large-diameter end portion of the boot is fastened and fixed by the boot band to the outer peripheral side of the open end portion of the outer joint member. Therefore, if the tightening force of the boot band is reduced due to an external factor such as a stepping stone while the vehicle is running, the sealing property of the boot fastening surface is deteriorated, and grease may leak.

そこで、本実施形態に係る自在継手１では、ブーツバンドを用いることなく、ブーツ１４の大径端部１４ｂを外側継手部材１１の開口端部の内周側に固定する構造を採用した。以下、その構造の詳細について、図２を参照しながら説明する。 Therefore, in the universal joint 1 according to the present embodiment, a structure is adopted in which the large-diameter end portion 14b of the boot 14 is fixed to the inner peripheral side of the open end portion of the outer joint member 11 without using a boot band. Hereinafter, the details of the structure will be described with reference to FIG.

外側継手部材１１の開口端部における内周側には、断面コの字状の環状溝１１１が形成されている。この環状溝１１１は、所定の固定力を確保できる幅および深さで形成する。 An annular groove 111 having a U-shaped cross section is formed on the inner peripheral side of the open end of the outer joint member 11. The annular groove 111 is formed with a width and a depth that can secure a predetermined fixing force.

ブーツ１４の大径端部１４ｂには、環状溝１１１に嵌合する折返部１４１が形成されている。この折返部１４１は、ブーツ１４の外径側に突出し、かつブーツ１４の大径端部１４ｂとは逆側に折り返された形状を有している。そして、折返部１４１には、折り返しによる環状の凹部１４１ａが形成されている。 The large-diameter end portion 14b of the boot 14 is formed with a folded-back portion 141 that fits into the annular groove 111. The folded portion 141 has a shape that protrudes to the outer diameter side of the boot 14 and is folded back to the side opposite to the large diameter end portion 14b of the boot 14. The folded portion 141 is formed with an annular recess 141a formed by folding.

折返部１４１の凹部１４１ａには、環状の固定部材（スナップリング）１７が挿入されている。この固定部材１７は、折返部１４１に対して、外径方向および軸方向の押圧力を付与する。これにより、ブーツ１４の大径端部１４ｂが、外側継手部材１１の開口端部の内周側に固定される。 An annular fixing member (snap ring) 17 is inserted into the recess 141a of the folded portion 141. The fixing member 17 applies pressing force in the outer diameter direction and the axial direction to the folded-back portion 141. As a result, the large-diameter end portion 14b of the boot 14 is fixed to the inner peripheral side of the open end portion of the outer joint member 11.

以上のような構成を備える自在継手１によれば、固定部材１７が外側に露出しない状態で、ブーツ１４が外側継手部材１１の内周側に固定されるため、外的要因等により固定部材１７の固定力が低下することが抑制される。また、自在継手１によれば、固定部材１７が折返部１４１に対して外径方向および軸方向の押付力を付与するため、外側継手部材１１とブーツ１４とが、二面（環状溝１１１と折返部１４１とが軸方向で接触する面、環状溝１１１と折返部１４１とが径方向で接触する面）でシールされ、シール性が向上する。従って、自在継手１によれば、ブーツ締結面のシール性を確保しつつ、ブーツ１４を外側継手部材１１に強固に固定することができる。 According to the universal joint 1 having the above configuration, the boot 14 is fixed to the inner peripheral side of the outer joint member 11 in a state where the fixing member 17 is not exposed to the outside, so that the fixing member 17 is fixed due to an external factor or the like. The decrease in the fixing force of the is suppressed. Further, according to the universal joint 1, since the fixing member 17 applies pressing force in the outer diameter direction and the axial direction to the folded-back portion 141, the outer joint member 11 and the boot 14 have two surfaces (annular groove 111 and the annular groove 111). It is sealed by a surface where the folded portion 141 is in contact with the axial direction and a surface where the annular groove 111 and the folded portion 141 are in contact with each other in the radial direction), and the sealing property is improved. Therefore, according to the universal joint 1, the boot 14 can be firmly fixed to the outer joint member 11 while ensuring the sealing property of the boot fastening surface.

なお、前記した折返部１４１は、環状溝１１１と接触する面（外周面）が平面状に形成されていたが、例えば図３に示す折返部１４１Ａのように、環状溝１１１と接触する面に複数の突起１４２を設けてもよい。このような突起１４２を設けることにより、折返部１４１Ａが環状溝１１１に対してより強固に固定されるため、シール性がさらに向上する。 The folded-back portion 141 had a flat surface (outer peripheral surface) in contact with the annular groove 111, but the folded-back portion 141 has a surface in contact with the annular groove 111, for example, as in the folded-back portion 141A shown in FIG. A plurality of protrusions 142 may be provided. By providing such a protrusion 142, the folded-back portion 141A is more firmly fixed to the annular groove 111, so that the sealing property is further improved.

以上、本発明に係る自在継手について、発明を実施するための形態により具体的に説明したが、本発明の趣旨はこれらの記載に限定されるものではなく、特許請求の範囲の記載に基づいて広く解釈されなければならない。また、これらの記載に基づいて種々変更、改変等したものも本発明の趣旨に含まれることはいうまでもない。 The universal joint according to the present invention has been specifically described above in terms of the mode for carrying out the invention, but the purpose of the present invention is not limited to these descriptions, but is based on the description of the scope of claims. Must be broadly interpreted. Needless to say, various changes, modifications, etc. based on these descriptions are also included in the gist of the present invention.

１ 自在継手
１１ 外側継手部材
１１１ 環状溝
１２ 内側継手部材
１２１ ケージ
１３ トルク伝達部材
１４ ブーツ
１４ａ 小径端部
１４ｂ 大径端部
１４ｃ 蛇腹部
１４１，１４１Ａ 折返部
１４１ａ 凹部
１４２ 突起
１５ シャフト
１６ ブーツバンド
１７ 固定部材 1 Universal joint 11 Outer joint member 111 Circular groove 12 Inner joint member 121 Cage 13 Torque transmission member 14 Boot 14a Small diameter end 14b Large diameter end 14c Bellows 141, 141A Folded part 141a Recess 142 Protrusion 15 Shaft 16 Boot band 17 Fixed Element

Claims (1)

外側継手部材と、前記外側継手部材との間でトルク伝達部材を介して角度変異を許容しながら回転トルクを伝達する内側継手部材と、前記外側継手部材に固定されるブーツと、を備える自在継手において、
前記外側継手部材の開口端部における内周側に形成された断面コの字状の環状溝と、
前記ブーツの端部に形成され、前記環状溝に嵌合する折返部であって、前記ブーツの外径側に突出し、かつ前記ブーツの端部とは逆側に折り返された折返部と、
前記折返部に挿入され、前記折返部に対して外径方向および軸方向の押付力を付与することにより、前記ブーツを前記外側継手部材に固定する固定部材と、
を有することを特徴とする自在継手。 A universal joint comprising an outer joint member, an inner joint member that transmits rotational torque while allowing an angle variation between the outer joint member via a torque transmission member, and boots fixed to the outer joint member. In
An annular groove having a U-shaped cross section formed on the inner peripheral side at the open end of the outer joint member,
A folded portion formed at the end of the boot and fitted into the annular groove, which protrudes toward the outer diameter side of the boot and is folded back to the side opposite to the end of the boot.
A fixing member inserted into the folded-back portion and applying pressing force in the outer diameter direction and the axial direction to the folded-back portion to fix the boot to the outer joint member.
A universal joint characterized by having.
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WO2007023802A1 (en) 2005-08-23 2007-03-01 Ntn Corporation Flexible boot for constant velocity universal joint
JP4743747B2 (en) 2004-12-08 2011-08-10 日立マクセル株式会社 Separator, manufacturing method thereof, and nonaqueous electrolyte battery
JP2013245697A (en) 2012-05-23 2013-12-09 Jtekt Corp Boot for constant velocity universal joint
JP5427268B2 (en) 2012-04-23 2014-02-26 京楽産業．株式会社 Game machine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5427268U (en) * 1977-07-27 1979-02-22
JPS587928U (en) * 1981-07-09 1983-01-19 トヨタ自動車株式会社 universal joint
JP2017061990A (en) * 2015-09-24 2017-03-30 Ntn株式会社 Boot for constant velocity universal joint and constant velocity universal joint having the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4743747B2 (en) 2004-12-08 2011-08-10 日立マクセル株式会社 Separator, manufacturing method thereof, and nonaqueous electrolyte battery
WO2007023802A1 (en) 2005-08-23 2007-03-01 Ntn Corporation Flexible boot for constant velocity universal joint
JP5427268B2 (en) 2012-04-23 2014-02-26 京楽産業．株式会社 Game machine
JP2013245697A (en) 2012-05-23 2013-12-09 Jtekt Corp Boot for constant velocity universal joint

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