JP6479735B2 - Gear device - Google Patents

Gear device Download PDF

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JP6479735B2
JP6479735B2 JP2016186451A JP2016186451A JP6479735B2 JP 6479735 B2 JP6479735 B2 JP 6479735B2 JP 2016186451 A JP2016186451 A JP 2016186451A JP 2016186451 A JP2016186451 A JP 2016186451A JP 6479735 B2 JP6479735 B2 JP 6479735B2
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bearing
oil
gear
gear device
housing
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JP2018053906A (en
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貴浩 加藤
貴浩 加藤
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Tsubakimoto Chain Co
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Tsubakimoto Chain Co
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Priority to JP2016186451A priority Critical patent/JP6479735B2/en
Priority to TW106119790A priority patent/TWI664363B/en
Priority to KR1020170081677A priority patent/KR102139478B1/en
Priority to CN201710667405.4A priority patent/CN107869571A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/042—Guidance of lubricant
    • F16H57/0421—Guidance of lubricant on or within the casing, e.g. shields or baffles for collecting lubricant, tubes, pipes, grooves, channels or the like
    • F16H57/0424—Lubricant guiding means in the wall of or integrated with the casing, e.g. grooves, channels, holes
    • 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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0467—Elements of gearings to be lubricated, cooled or heated
    • F16H57/0469—Bearings or seals
    • F16H57/0471—Bearing

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Details Of Gearings (AREA)
  • Gear Transmission (AREA)

Description

本発明は、ハウジングと、入力軸、出力軸を具え、モータ等の駆動装置から入力軸に伝達されたトルクが歯車機構を介して出力軸に伝達される歯車装置に関する。   The present invention relates to a gear device that includes a housing, an input shaft, and an output shaft, and that transmits torque transmitted from a drive device such as a motor to the input shaft to the output shaft via a gear mechanism.

歯車装置の入力軸と出力軸は軸受によって回転可能に軸支されている。ハウジングと入力軸及び出力軸のそれぞれの間には封止部材が設けられることによって、ハウジング内部は密封され、ハウジング内部には潤滑油が封入される。歯車装置の入力軸にトルクが伝達され、歯車装置が作動しているとき、ハウジング内部の潤滑油は、歯車機構によって掻き揚げられ、歯車機構の歯車同士の噛合部を潤滑するとともに、軸受内部に浸透し、軸受の発熱を抑制する。   The input shaft and output shaft of the gear device are rotatably supported by bearings. By providing a sealing member between the housing and each of the input shaft and the output shaft, the inside of the housing is sealed, and lubricating oil is sealed inside the housing. When torque is transmitted to the input shaft of the gear device and the gear device is operating, the lubricating oil inside the housing is swept up by the gear mechanism, lubricates the meshing portions of the gears of the gear mechanism, and inside the bearing. It penetrates and suppresses heat generation of the bearing.

しかし、例えば、歯車装置の入力軸又は出力軸が高速で回転するときは、軸受の発熱量が大きいので、何らの対策も施さないと、潤滑油の循環が間に合わず、軸受が異常に発熱し、焼付いてしまうという問題がある。また、潤滑油の粘度が比較的高い場合にも、潤滑油が軸受内部を通過し難いので、同様の問題が起こり得る。このような軸受の焼付きを防止するための技術として、以下に挙げるものがある。   However, for example, when the input shaft or output shaft of a gear unit rotates at a high speed, the amount of heat generated by the bearing is large.If no measures are taken, the circulation of the lubricating oil will not be in time, and the bearing will generate heat abnormally. There is a problem of burning. Also, when the viscosity of the lubricating oil is relatively high, the same problem can occur because the lubricating oil is difficult to pass through the inside of the bearing. Examples of techniques for preventing such bearing seizure include the following.

特開２０１４−９７６４号公報Japanese Patent Application Laid-Open No. 2014-9964

特許文献１には、軸受の下方に位置するハウジングに、第１の油溜まり空間と連通する油供給通路を設け、歯車装置の作動時、当該油供給通路を通じて、軸受に対し、第１の油溜まりの反対側にも油溜まり（第２の油溜まり）が形成されるようにした潤滑構造が開示されている。   In Patent Document 1, an oil supply passage communicating with the first oil sump space is provided in a housing located below the bearing, and the first oil is supplied to the bearing through the oil supply passage when the gear device is operated. A lubricating structure is disclosed in which an oil sump (second oil sump) is formed on the opposite side of the sump.

特許文献１の潤滑構造は、その構造により、潤滑油の撹拌抵抗を抑え、且つ、軸受へ潤滑油を循環させるという効果を奏するものであるが、油供給通路を設けるためには、軸受の下方に位置するハウジングに孔を開ける加工を施さなければならないため、加工に手間が掛かるという問題がある。   The lubrication structure of Patent Document 1 has the effect of suppressing the stirring resistance of the lubricating oil and circulating the lubricating oil to the bearing by the structure. There is a problem that it takes time and effort to make a hole in the housing located at the center.

そこで、本発明は、前述した従来技術の問題点に鑑み、より簡素な構造で、軸受の発熱を抑えることができる潤滑構造を具えた歯車装置を提供することを目的とする。   In view of the above-described problems of the prior art, an object of the present invention is to provide a gear device having a lubrication structure with a simpler structure and capable of suppressing heat generation of a bearing.

本発明は、ハウジングと、少なくとも２つの回転軸と、前記回転軸同士のトルクを伝達する歯車機構と、前記歯車機構の少なくとも一部が入るように前記ハウジング内部に設けられた油溜り部を具え、
前記回転軸の少なくとも１つは、前記ハウジングに設けられた軸受固定部に配設されている軸受によって水平方向に軸支された水平軸であり、
前記軸受固定部の内周面上であって前記軸受に対向する位置に、前記油溜り部に連通し、且つ、前記軸受に対して前記油溜り部の反対側に延出する油溝が少なくとも１つ形成されていることを特徴とする歯車装置によって前記課題を解決した。 The present invention includes a housing, at least two rotating shafts, a gear mechanism for transmitting torque between the rotating shafts, and an oil reservoir provided in the housing so that at least a part of the gear mechanism is inserted. ,
At least one of the rotating shafts is a horizontal shaft that is supported in a horizontal direction by a bearing disposed in a bearing fixing portion provided in the housing,
An oil groove that communicates with the oil reservoir and extends on the opposite side of the oil reservoir with respect to the bearing at a position on the inner peripheral surface of the bearing fixing portion and facing the bearing. The above-mentioned problem has been solved by a gear device characterized in that one is formed.

本発明によれば、水平軸を軸支する軸受に対向する軸受固定部の内周面上に、油溜り部に連通し、且つ、軸受に対して油溜り部の反対側に延出する油溝が少なくとも１つ形成されているので、潤滑油の循環経路を確保することができる。すなわち、軸受内部に浸透し、軸受から熱を吸収した潤滑油は、油溝を通じて油溜り部へ排出される。よって、潤滑油の循環効率が向上し、軸受から熱を吸収する前の温度が比較的低い潤滑油が軸受内部に浸透し易くなるので、軸受の発熱を抑えることができる。   According to the present invention, the oil that communicates with the oil reservoir on the inner peripheral surface of the bearing fixing portion that faces the bearing that supports the horizontal shaft and that extends to the opposite side of the oil reservoir with respect to the bearing. Since at least one groove is formed, a lubricating oil circulation path can be secured. That is, the lubricating oil that has penetrated into the bearing and absorbed heat from the bearing is discharged to the oil reservoir through the oil groove. Therefore, the circulation efficiency of the lubricating oil is improved, and the lubricating oil having a relatively low temperature before absorbing heat from the bearing can easily penetrate into the bearing, so that heat generation of the bearing can be suppressed.

また、油溝は、軸受固定部の内周面上に設けられる溝という簡素な構造なので、加工が容易である。このため、従来に比べて、加工工数・コストを掛けずに、上述した軸受の発熱抑止という効果を得ることができる。   Moreover, since the oil groove is a simple structure of a groove provided on the inner peripheral surface of the bearing fixing portion, processing is easy. For this reason, it is possible to obtain the above-described effect of suppressing the heat generation of the bearing without increasing the processing man-hours and cost as compared with the conventional case.

また、水平軸の軸受が、当該軸受に対して油溜り部の反対側に複数設けられているタイプの歯車装置であっても、油溝を複数の軸受の軸受固定部を連通するように設けることにより、上述した効果を得ることができる。   Further, even in a gear device in which a plurality of horizontal shaft bearings are provided on the opposite side of the oil reservoir with respect to the bearing, an oil groove is provided so as to communicate with the bearing fixing portions of the plurality of bearings. As a result, the effects described above can be obtained.

また、油溝を複数設けることにより、潤滑油の循環効率を一層高めることができる。   Further, by providing a plurality of oil grooves, the circulation efficiency of the lubricating oil can be further increased.

また、油溝をその延伸方向に傾斜させることにより、潤滑油を油溜り部方向に排出させ易くすることもできる。   Further, by inclining the oil groove in the extending direction, the lubricating oil can be easily discharged in the direction of the oil reservoir.

本発明の第一実施形態の縦断面図。The longitudinal cross-sectional view of 1st embodiment of this invention. 図１の要部拡大図。The principal part enlarged view of FIG. 図１の３−３線矢視図。FIG. 3 is a view taken along line 3-3 in FIG. 1. 本発明の第二実施形態の要部の拡大縦断面図。The expanded longitudinal cross-sectional view of the principal part of 2nd embodiment of this invention. 本発明の第三実施形態の要部の正面図。The front view of the principal part of 3rd embodiment of this invention.

本発明の実施例を、図１〜５を参照して説明する。但し、本発明はこの実施形態に限定されるものではない。   An embodiment of the present invention will be described with reference to FIGS. However, the present invention is not limited to this embodiment.

図１に示されている歯車装置１０は、ハウジング１２と、回転軸である入力軸１４と出力軸１６を具えている。入力軸１４上にはピニオンギア２２が設けられ、出力軸１６上には、ピニオンギア２２と噛合う出力ギア２４が設けられている。入力軸１４はモータ（図示省略。）等の駆動装置からトルクが伝達され、入力軸１４に伝達されたトルクは、ピニオンギア２２及び出力ギア２４から構成される歯車機構２０を介して出力軸１６に伝達される。なお、回転軸及び歯車機構をさらに具える歯車装置に本発明を適用することも可能であるが、説明の便宜上、回転軸が２つの歯車装置を用いて説明する。   A gear device 10 shown in FIG. 1 includes a housing 12, an input shaft 14 that is a rotating shaft, and an output shaft 16. A pinion gear 22 is provided on the input shaft 14, and an output gear 24 that meshes with the pinion gear 22 is provided on the output shaft 16. Torque is transmitted to the input shaft 14 from a drive device such as a motor (not shown), and the torque transmitted to the input shaft 14 is output to the output shaft 16 via a gear mechanism 20 including a pinion gear 22 and an output gear 24. Is transmitted to. Although the present invention can be applied to a gear device that further includes a rotating shaft and a gear mechanism, for convenience of explanation, a gear device having two rotating shafts will be described.

図示しているように、入力軸１４と出力軸１６は軸受によって軸支されており、入力軸１４の一端と出力軸１６の両端はハウジング１２を貫通している。しかし、入力軸１４とハウジング１２の間、及び出力軸１６とハウジング１２の間のそれぞれに封止部材１１，１３，１５が設けられることによって、ハウジング１２内部は密封される。   As shown in the drawing, the input shaft 14 and the output shaft 16 are supported by bearings, and one end of the input shaft 14 and both ends of the output shaft 16 penetrate the housing 12. However, the inside of the housing 12 is sealed by providing the sealing members 11, 13, and 15 between the input shaft 14 and the housing 12 and between the output shaft 16 and the housing 12.

ハウジング１２内部に設けられる油溜り部１８には、潤滑油（図示省略。）が封入され、例えば、歯車装置１０の停止時にオイルレベルＯＬで示す位置まで潤滑油が入れられる。油溜り部１８は、歯車機構２０の歯車（本実施例では、ピニオンギア２２）によって潤滑油が掻き揚げられるように、歯車機構２０の少なくとも一部が入るように設けられていればよい。なお、潤滑油を封入する量は歯車装置の構成、設置姿勢等によって適宜変更される。   Lubricating oil (not shown) is sealed in the oil reservoir 18 provided inside the housing 12 and, for example, the lubricating oil is put to a position indicated by the oil level OL when the gear device 10 is stopped. The oil reservoir 18 may be provided so that at least a part of the gear mechanism 20 enters so that the lubricating oil is lifted up by the gear of the gear mechanism 20 (in the present embodiment, the pinion gear 22). The amount of the lubricating oil is appropriately changed depending on the configuration of the gear device, the installation posture, and the like.

歯車装置１０を設置したとき、入力軸１４は、軸受１７，１９によって水平方向に軸支される水平軸である。そして、入力軸１４を軸支している軸受１７が嵌められている、ハウジング１２内部の軸受固定部３２には、潤滑構造３０が設けられている。   When the gear device 10 is installed, the input shaft 14 is a horizontal shaft that is supported in the horizontal direction by the bearings 17 and 19. A lubrication structure 30 is provided in the bearing fixing portion 32 inside the housing 12 to which the bearing 17 that supports the input shaft 14 is fitted.

図２に示されているとおり、潤滑構造３０は、軸受固定部３２の内周面３２ａ上に設けられる油溝３４で構成されている。具体的には、油溝３４は、軸受固定部３２の内周面３２ａ上の内、軸受１７に対向する位置に、軸受１７に対して油溜り部１８の反対側に延出するように、且つ、油溜り部１８に連通するように設けられる。また、油溝３４は、軸受１７の垂直方向下半分に対向する位置に設けられる。歯車装置１０の潤滑油は、歯車装置１０の作動時に油溝３４が潤滑油で浸る程度に封入する。   As shown in FIG. 2, the lubrication structure 30 includes an oil groove 34 provided on the inner peripheral surface 32 a of the bearing fixing portion 32. Specifically, the oil groove 34 extends to the opposite side of the oil reservoir 18 with respect to the bearing 17 at a position facing the bearing 17 on the inner peripheral surface 32a of the bearing fixing portion 32. In addition, it is provided so as to communicate with the oil reservoir 18. The oil groove 34 is provided at a position facing the lower half of the bearing 17 in the vertical direction. The lubricating oil of the gear device 10 is sealed to such an extent that the oil groove 34 is immersed in the lubricating oil when the gear device 10 is operated.

入力軸１４にトルクが伝達され、歯車装置１０が作動した時、油溜り部１８に入れられている潤滑油はピニオンギア２２によって掻き揚げられるとともに、軸受内部に浸透する。その後、軸受１７から熱を吸収した潤滑油は油溝３４を通じて油溜り部１８に排出されるので、潤滑油の循環効率を高めることができる。
よって、軸受１７から熱を吸収する前の、油溜り部１８側に存在する、温度が比較的低い潤滑油が軸受１７内部に浸透し易くなるので、軸受１７の発熱を抑えることができる。なお、油溝３４を、その延伸方向の内、油溜り部１８に向けて傾斜させれば、油溝３４を通る潤滑油を油溜り部１８方向に排出させ易くすることができる。また、油溝３４と油溜り部１８が連通し、且つ、潤滑油に浸っている場合は、油溝３４をその延伸方向のいずれに傾斜させてもよい。 When torque is transmitted to the input shaft 14 and the gear device 10 is operated, the lubricating oil contained in the oil reservoir 18 is lifted up by the pinion gear 22 and penetrates into the bearing. Thereafter, since the lubricating oil that has absorbed heat from the bearing 17 is discharged to the oil reservoir 18 through the oil groove 34, the circulation efficiency of the lubricating oil can be increased.
Therefore, since the lubricating oil having a relatively low temperature existing on the oil reservoir 18 side before absorbing heat from the bearing 17 easily penetrates into the bearing 17, heat generation of the bearing 17 can be suppressed. If the oil groove 34 is inclined toward the oil reservoir 18 in the extending direction, the lubricating oil passing through the oil groove 34 can be easily discharged in the direction of the oil reservoir 18. Further, when the oil groove 34 and the oil reservoir 18 communicate with each other and are immersed in the lubricating oil, the oil groove 34 may be inclined in any of the extending directions.

図３に示すように、油溝３４は、断面が半円状である。この他に、断面が角形や楕円形の油溝とすることもできる。これらの形状の油溝は、軸受固定部３２の内周面３２ａ上を削る等して容易に形成することができる。このため、従来に比べて、加工工数・コストを掛けずに、軸受１７の発熱抑止という効果を得ることができる。   As shown in FIG. 3, the oil groove 34 has a semicircular cross section. In addition to this, an oil groove having a square or elliptical cross section may be used. The oil grooves having these shapes can be easily formed by cutting the inner peripheral surface 32a of the bearing fixing portion 32 or the like. For this reason, the effect of suppressing the heat generation of the bearing 17 can be obtained without increasing the number of processing steps and costs as compared with the conventional case.

図４は、本発明の第二実施形態の歯車装置１０ａの要部の拡大縦断面図である。歯車装置１０ａの１つの回転軸であり、水平軸である入力軸１４ａは、ハウジング１２ａの軸受固定部３２ｂに嵌められている軸受１７ａ，１７ｂによって軸支されている。入力軸１４ａ上には入力傘歯車３５が設けられ、入力傘歯車３５と噛合う出力傘歯車３６を介して図示しない出力軸にトルクが伝達されるように構成されている。歯車装置１０ａに封入する潤滑油の量などの構成は、歯車装置１０と同様、歯車装置１０ａの作動時に油溝３４ａが潤滑油で浸る程度に封入すればよく、例えば、オイルレベルＯＬで示すレベルに入れればよい。   FIG. 4 is an enlarged longitudinal sectional view of a main part of the gear device 10a according to the second embodiment of the present invention. An input shaft 14a, which is one rotating shaft of the gear device 10a and is a horizontal shaft, is pivotally supported by bearings 17a and 17b fitted in a bearing fixing portion 32b of the housing 12a. An input bevel gear 35 is provided on the input shaft 14 a, and torque is transmitted to an output shaft (not shown) via an output bevel gear 36 that meshes with the input bevel gear 35. The configuration of the amount of lubricating oil to be enclosed in the gear device 10a may be such that the oil groove 34a is enclosed to the extent that the oil groove 34a is immersed in the lubricating oil when the gear device 10a is operated, as in the gear device 10, for example, the level indicated by the oil level OL Just put it in.

図示しているように、入力軸１４ａを軸支している軸受１７ａ，１７ｂは、油溜り部１８に対して反対側に並んで設けられている。このように、軸受が複数設けられている場合、潤滑構造３０ａの油溝３４ａは、軸受１７ａ，１７ｂのそれぞれの軸受固定部３２ｂを連通するように、軸受固定部３２ｂ，３２ｂの間を含む内周面３２ｃ上に設けることができる。潤滑構造３０ａにおいても、油溝３４ａは、油溜り部１８に連通し、且つ、油溜り部１８から最も遠い位置に配設される軸受１７ｂに対し、油溜り部１８の反対側に延出するように設けられる。これにより、軸受１７ａ、１７ｂから熱を吸収した潤滑油は油溝３４ａを通じて油溜り部１８に排出されるので、潤滑油の循環効率を高めることができる。なお、油溝３４ａをその延伸方向に傾斜させてもよいことは、上述した、油溝３４の場合と同様である。   As shown in the drawing, the bearings 17 a and 17 b that support the input shaft 14 a are provided side by side on the opposite side with respect to the oil reservoir 18. As described above, when a plurality of bearings are provided, the oil groove 34a of the lubrication structure 30a includes an inner portion including between the bearing fixing portions 32b and 32b so as to communicate with the respective bearing fixing portions 32b of the bearings 17a and 17b. It can be provided on the peripheral surface 32c. Also in the lubricating structure 30 a, the oil groove 34 a communicates with the oil reservoir 18 and extends to the opposite side of the oil reservoir 18 with respect to the bearing 17 b disposed at a position farthest from the oil reservoir 18. It is provided as follows. As a result, the lubricating oil that has absorbed heat from the bearings 17a and 17b is discharged to the oil reservoir 18 through the oil groove 34a, so the circulation efficiency of the lubricating oil can be increased. Note that the oil groove 34a may be inclined in the extending direction as in the case of the oil groove 34 described above.

図５に示す潤滑構造３０ｂのように、軸受（図示省略。）を嵌める軸受固定部３２ｄの内周面３２ｅ上に、複数の油溝３４ｂ，３４ｃ，３４ｄを設けることもできる。これにより、潤滑油の循環効率をさらに高めることができるので、軸受の発熱を一層抑えることができる。   A plurality of oil grooves 34b, 34c, and 34d can be provided on the inner peripheral surface 32e of the bearing fixing portion 32d in which a bearing (not shown) is fitted, as in the lubricating structure 30b shown in FIG. Thereby, since the circulation efficiency of lubricating oil can further be improved, the heat_generation | fever of a bearing can be suppressed further.

本発明の潤滑構造の油溝の幅は、使用する潤滑油に応じて適宜設定することができる。また、油溝を設けた軸受固定部に嵌める軸受は、ボールベアリングであっても、テーパーローラベアリングであってもよく、歯車機構としては、スパーギア、ヘリカルギア、ベベルギア、ウォームギア、ハイポイドギア、遊星歯車などの各種歯車機構を使用することができる。   The width of the oil groove of the lubricating structure of the present invention can be appropriately set according to the lubricating oil used. The bearing fitted into the bearing fixing portion provided with the oil groove may be a ball bearing or a tapered roller bearing, and the spur gear, helical gear, bevel gear, worm gear, hypoid gear, planetary gear, etc. as the gear mechanism Various gear mechanisms can be used.

以上に説明したとおり、本発明によれば、潤滑油の循環経路を確保することができ、潤滑油の循環効率が向上するので、軸受から熱を吸収する前の温度が比較的低い潤滑油が軸受内部に浸透し易くなり、軸受の発熱を抑えることができる。   As described above, according to the present invention, a lubricating oil circulation path can be secured and the lubricating oil circulation efficiency is improved. Therefore, the lubricating oil having a relatively low temperature before absorbing heat from the bearing can be obtained. It becomes easy to penetrate into the bearing and heat generation of the bearing can be suppressed.

１０，１０ａ 歯車装置
１２，１２ａ ハウジング
１４，１４ａ 回転軸（水平軸，入力軸）
１６ 回転軸（出力軸）
１８ 油溜り部
２０ 歯車機構
３２，３２ｂ，３２ｄ 軸受固定部
１７，１７ａ，１７ｂ 軸受
３４，３４ａ，３４ｂ，３４ｃ，３４ｄ 油溝 10, 10a Gear device 12, 12a Housing 14, 14a Rotating shaft (horizontal axis, input shaft)
16 Rotating shaft (Output shaft)
18 Oil reservoir 20 Gear mechanism 32, 32b, 32d Bearing fixing part 17, 17a, 17b Bearing 34, 34a, 34b, 34c, 34d Oil groove

Claims (4)

ハウジングと、少なくとも２つの回転軸と、前記回転軸同士のトルクを伝達する歯車機構と、前記歯車機構の少なくとも一部が入るように前記ハウジング内部に設けられた油溜り部を具え、
前記回転軸の少なくとも１つは、前記ハウジングに設けられた軸受固定部に配設されている軸受によって水平方向に軸支された水平軸であり、
前記軸受固定部の内周面上であって前記軸受に対向する位置に、前記油溜り部に連通し、且つ、前記軸受に対して前記油溜り部の反対側に延出する油溝が少なくとも１つ形成されていることを特徴とする、
歯車装置。 A housing, at least two rotating shafts, a gear mechanism for transmitting torque between the rotating shafts, and an oil reservoir provided inside the housing so that at least a part of the gear mechanism is included;
At least one of the rotating shafts is a horizontal shaft that is supported in a horizontal direction by a bearing disposed in a bearing fixing portion provided in the housing,
An oil groove that communicates with the oil reservoir and extends on the opposite side of the oil reservoir with respect to the bearing at a position on the inner peripheral surface of the bearing fixing portion and facing the bearing. One is formed,
Gear device. 前記軸受が該軸受に対して前記油溜り部の反対側に複数設けられ、
前記油溝が前記複数の軸受の軸受固定部を連通している、請求項１の歯車装置。 A plurality of the bearings are provided on the opposite side of the oil reservoir to the bearings;
The gear device according to claim 1, wherein the oil groove communicates with bearing fixing portions of the plurality of bearings. 前記油溝が前記軸受の周方向に複数設けられている、請求項１又は２の歯車装置。   The gear device according to claim 1 or 2, wherein a plurality of the oil grooves are provided in a circumferential direction of the bearing. 前記油溝がその延伸方向に傾斜している、請求項１から３のいずれかの歯車装置。   The gear device according to any one of claims 1 to 3, wherein the oil groove is inclined in the extending direction.
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