JP2020079636A

JP2020079636A - Power transmission device

Info

Publication number: JP2020079636A
Application number: JP2018213922A
Authority: JP
Inventors: 真一郎末永; Shinichiro Suenaga; 賢志宮永; Kenji Miyanaga; 友暁鈴木; Tomoaki Suzuki; 史明重松; Fumiaki Shigematsu; 一宇田中; Ichiu Tanaka
Original assignee: Aisin AW Co Ltd; Toyota Motor Corp
Current assignee: Aisin AW Co Ltd; Toyota Motor Corp
Priority date: 2018-11-14
Filing date: 2018-11-14
Publication date: 2020-05-28

Abstract

To provide a power transmission device capable of reliably preventing bubbles from being sucked into an oil pump.SOLUTION: A power transmission device 10 includes a driving shaft 14 connected to a driving gear 12, and an oil pump 16 to be operated by rotating force transmitted from the driving gear 12 to the driving shaft 14 to suck oil 20 stored in a case 18, part of the driving gear 12 being arranged below an oil surface F of the oil 20 stored in the case 18, the oil pump 16 being provided with a cover member 30 storing the lower part of the driving gear 12 and covering the peripheral face and side face of the lower part. An entry port 40 where the teeth of the driving gear 12 enter to the inside of the cover member 30 during the rotation of the driving gear 12 is arranged below the oil surface F, and an exit port 42 where the teeth of the driving gear 12 exist to the outside of the cover member 30 is arranged above the oil surface F.SELECTED DRAWING: Figure 1

Description

本発明は、車両などに備わる動力伝達装置に関するものである。 The present invention relates to a power transmission device provided in a vehicle or the like.

従来、車両に備わる動力伝達装置として、動力を伝達する動力伝達軸の回転によって回転駆動される駆動ギヤと、該駆動ギヤに連結された駆動シャフトとを備えたものが知られている。こうした動力伝達装置には、車両前進走行時において、駆動シャフトに伝達される回転力によって作動し、ケース内に貯留されたオイルを吸入するオイルポンプを備えたものがある（例えば、特許文献１を参照）。特許文献１に記載の装置は、駆動ギヤの下部の周囲および側面を覆うカバー部材を備えており、駆動ギヤの回転によって発生する気泡がオイルとともにオイルポンプに吸い込まれることを抑制するようになっている。こうすることで、オイルポンプ内でのエロージョン（壊食）の発生や、作動音の増大を抑制している。 BACKGROUND ART Conventionally, as a power transmission device provided in a vehicle, there is known a power transmission device that includes a drive gear that is rotationally driven by rotation of a power transmission shaft that transmits power, and a drive shaft that is connected to the drive gear. Some of such power transmission devices include an oil pump that is operated by the rotational force transmitted to the drive shaft and sucks the oil stored in the case when the vehicle travels forward (see Patent Document 1, for example). reference). The device described in Patent Document 1 includes a cover member that covers the periphery of the lower portion and the side surface of the drive gear, and suppresses the bubbles generated by the rotation of the drive gear from being sucked into the oil pump together with the oil. There is. By doing so, the occurrence of erosion (erosion) in the oil pump and the increase in operating noise are suppressed.

特開２０１７−０７８４８９号公報JP, 2017-078489, A

ところで、上記の従来の特許文献１では、駆動ギヤの外周端部がカバー部材から退出する退出口を、油面よりも下方に設定している。このため、駆動ギヤの高速回転時においては、退出口からカバー部材の外部に放出された気泡が消えずに吸入口からオイルポンプに吸い込まれるおそれがあった。 By the way, in the above-mentioned conventional patent document 1, the withdrawal outlet from which the outer peripheral end of the drive gear withdraws from the cover member is set below the oil level. Therefore, when the drive gear rotates at a high speed, there is a risk that the bubbles discharged from the exit to the outside of the cover member will not disappear and may be sucked into the oil pump from the intake.

本発明は、上記に鑑みてなされたものであって、気泡がオイルポンプに吸い込まれることを確実に防止することのできる動力伝達装置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 power transmission device capable of reliably preventing bubbles from being sucked into an oil pump.

上記した課題を解決し、目的を達成するために、本発明に係る動力伝達装置は、動力を伝達する動力伝達軸の回転によって回転駆動される駆動ギヤと、該駆動ギヤに連結された駆動シャフトと、前記駆動ギヤから前記駆動シャフトに伝達される回転力によって作動し、ケース内に貯留されたオイルを吸入するオイルポンプとを備えた動力伝達装置であって、前記駆動ギヤの一部は、前記ケース内に貯留されたオイルの油面よりも下方に配置され、前記オイルポンプには、前記駆動ギヤの下部を収容し、該下部の周面および側面を覆うカバー部材が設けられ、前記駆動ギヤの回転時において、前記駆動ギヤの歯が前記カバー部材の内側に進入する進入口は、前記油面よりも下方に配置され、前記駆動ギヤの歯が前記カバー部材の外側に退出する退出口は、前記油面よりも上方に配置されることを特徴とする。 In order to solve the above problems and to achieve the object, a power transmission device according to the present invention is a drive gear that is rotationally driven by rotation of a power transmission shaft that transmits power, and a drive shaft that is connected to the drive gear. A power transmission device including: an oil pump that is operated by a rotational force transmitted from the drive gear to the drive shaft, and sucks oil stored in a case, wherein a part of the drive gear is A cover member is provided below the oil surface of the oil stored in the case, the oil pump is provided with a cover member that accommodates a lower portion of the drive gear and covers a peripheral surface and a side surface of the lower portion of the drive gear. When the gear rotates, the entrance of the drive gear teeth into the inside of the cover member is arranged below the oil level, and the exit of the drive gear teeth exits from the cover member. Is arranged above the oil level.

本発明に係る動力伝達装置によれば、駆動ギヤの回転によって発生した気泡は、油面よりも上方に配置された退出口を通じて気中に放出されるため、気泡がオイルポンプに吸い込まれるのを確実に防止することができる。 According to the power transmission device of the present invention, the bubbles generated by the rotation of the drive gear are discharged into the air through the exit port that is arranged above the oil surface, so that the bubbles are not sucked into the oil pump. It can be surely prevented.

図１は、本発明の実施の形態に係る動力伝達装置を示す概略側面図である。FIG. 1 is a schematic side view showing a power transmission device according to an embodiment of the present invention. 図２は、図１のＡ−Ａ線に沿った断面図である。FIG. 2 is a sectional view taken along the line AA of FIG. 図３は、図２のＢ部分の拡大図である。FIG. 3 is an enlarged view of portion B of FIG. 図４は、図２のＣ−Ｃ線に沿った下面図である。FIG. 4 is a bottom view taken along the line CC of FIG. 図５は、本発明の実施の形態の作用説明図である。FIG. 5 is an operation explanatory view of the embodiment of the present invention.

以下に、本発明に係る動力伝達装置の実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 Embodiments of a power transmission device according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to this embodiment.

図１〜図４に示すように、本発明の実施の形態に係る動力伝達装置１０は、車両に搭載され、駆動ギヤ１２と、駆動ギヤ１２に連結された駆動シャフト１４と、駆動ギヤ１２から駆動シャフト１４に伝達される回転力によって作動するオイルポンプ１６とを備える。 As shown in FIGS. 1 to 4, a power transmission device 10 according to an embodiment of the present invention is mounted on a vehicle and includes a drive gear 12, a drive shaft 14 connected to the drive gear 12, and a drive gear 12. The oil pump 16 is operated by the rotational force transmitted to the drive shaft 14.

オイルポンプ１６は、ケース１８の底部に貯留されたオイル２０を最下部のストレーナ２２を通じて吸入して図示しない油圧制御装置に圧送する。油圧制御装置は、複数の油路を有するバルブボディや電磁弁を有して各部に供給されるオイルの油圧を制御し、各部の潤滑等を行う。図３に示すように、オイルポンプ１６を作動する駆動シャフト１４は、ハウジング２４に配置された軸受２６によって回転可能に支持されている。駆動シャフト１４には、オイルポンプ１６の外壁面２８から突出した先端部側に、駆動ギヤ１２が相対回転不能に連結されている。 The oil pump 16 sucks the oil 20 stored at the bottom of the case 18 through the strainer 22 at the lowermost part and sends it to a hydraulic control device (not shown) under pressure. The hydraulic control device has a valve body having a plurality of oil passages and a solenoid valve to control the hydraulic pressure of the oil supplied to each part to lubricate each part. As shown in FIG. 3, the drive shaft 14 that operates the oil pump 16 is rotatably supported by a bearing 26 arranged in the housing 24. The drive gear 12 is connected to the drive shaft 14 so as to be relatively non-rotatable at the tip end side thereof protruding from the outer wall surface 28 of the oil pump 16.

駆動ギヤ１２は、動力を伝達する図外の動力伝達軸の回転によって回転駆動される。動力伝達軸は、車両の駆動源であるエンジンの駆動力によって回転する軸状の部材であり、例えばトルクコンバータの出力回転部材で構成される。図１に示すように、駆動ギヤ１２は、その一部がケース１８内に貯留されたオイル２０の油面Ｆよりも下方に配置されている。駆動ギヤ１２は、動力伝達軸の回転方向に応じた所定の方向に回転する。図１では、車両前進走行時における駆動ギヤ１２の回転方向を矢印Ｒで示している。 The drive gear 12 is rotationally driven by rotation of a power transmission shaft (not shown) that transmits power. The power transmission shaft is a shaft-shaped member that is rotated by the driving force of the engine that is the drive source of the vehicle, and is composed of, for example, an output rotating member of the torque converter. As shown in FIG. 1, part of the drive gear 12 is arranged below the oil level F of the oil 20 stored in the case 18. The drive gear 12 rotates in a predetermined direction according to the rotation direction of the power transmission shaft. In FIG. 1, the rotation direction of the drive gear 12 during forward traveling of the vehicle is indicated by an arrow R.

この動力伝達装置１０は、駆動ギヤ１２の下部を収容するカバー部材３０を備えている。図１および図３に示すように、カバー部材３０は、周壁部３２と、外側壁部３４と、内側壁部３６とを有している。周壁部３２は、カバー部材３０に収容された部分の駆動ギヤ１２の周面（外周面）を覆い、外側壁部３４は、カバー部材３０に収容された部分の駆動ギヤ１２の一方の側面１２Ａ（オイルポンプ１６側とは反対側の側面）を覆っている。内側壁部３６は、カバー部材３０に収容された部分の駆動ギヤ１２の他方の側面１２Ｂ（オイルポンプ１６側の側面）の径方向外側を覆っている。駆動ギヤ１２の他方の側面１２Ｂの径方向内側（図３の側面１２Ｂの上側）は、オイルポンプ１６の外壁面２８に対向している。内側壁部３６はオイルポンプ１６の外壁面２８に固定されている。なお、本実施の形態では、カバー部材３０が固定されるオイルポンプ１６の外壁面２８が、ハウジング２４における駆動ギヤ１２側の側面によって形成されている。 The power transmission device 10 includes a cover member 30 that accommodates a lower portion of the drive gear 12. As shown in FIGS. 1 and 3, the cover member 30 has a peripheral wall portion 32, an outer side wall portion 34, and an inner side wall portion 36. The peripheral wall portion 32 covers the peripheral surface (outer peripheral surface) of the drive gear 12 in the portion accommodated in the cover member 30, and the outer wall portion 34 is one side surface 12A of the drive gear 12 in the portion accommodated in the cover member 30. It covers the (side surface opposite to the oil pump 16 side). The inner wall portion 36 covers the radially outer side of the other side surface 12B (side surface on the oil pump 16 side) of the drive gear 12 that is accommodated in the cover member 30. The inner side in the radial direction of the other side surface 12B of the drive gear 12 (the upper side of the side surface 12B in FIG. 3) faces the outer wall surface 28 of the oil pump 16. The inner wall portion 36 is fixed to the outer wall surface 28 of the oil pump 16. In the present embodiment, the outer wall surface 28 of the oil pump 16 to which the cover member 30 is fixed is formed by the side surface of the housing 24 on the drive gear 12 side.

カバー部材３０の外側壁部３４、内側壁部３６は、図１に示すように、駆動シャフト１４の軸方向から見た側面視において扇形状をなし、その外周側の端部が円弧状である。この外側壁部３４、内側壁部３６における外周側の端部の円弧中心Ｏは、駆動シャフト１４の回転軸線Ｚと一致しており、周壁部３２は、図３に示すように、外側壁部３４と内側壁部３６の外周側の端部どうしを繋ぐように延在している。また、図１に示すように、外側壁部３４、内側壁部３６の円弧中心Ｏの周辺部は円弧状に切り欠き形成され、この切り欠き部３８の周端面の全体がオイル２０の油面Ｆよりも上方に位置している。 As shown in FIG. 1, the outer side wall portion 34 and the inner side wall portion 36 of the cover member 30 are fan-shaped in a side view as seen from the axial direction of the drive shaft 14, and the ends on the outer peripheral side are arcuate. .. The arc center O of the outer peripheral side end portions of the outer side wall portion 34 and the inner side wall portion 36 coincides with the rotation axis Z of the drive shaft 14, and the peripheral wall portion 32, as shown in FIG. 34 extends so as to connect the outer peripheral side end portions of the inner wall portion 36. Further, as shown in FIG. 1, peripheral portions of the outer wall portion 34 and the inner wall portion 36 around the arc center O are cut out in an arc shape, and the entire peripheral end surface of the cut portion 38 is the oil surface of the oil 20. It is located above F.

図１に示すように、駆動ギヤ１２がＲ方向に回転する車両前進走行時において、駆動ギヤ１２の外周の歯がカバー部材３０の内側に進入する進入口４０は、油面Ｆよりも下方、かつ、駆動ギヤ１２の下端部（最下点）よりも上方に設けられている。駆動ギヤ１２の外周の歯がカバー部材３０の外側に退出する退出口４２は、油面Ｆよりも上方に配置される。なお、本実施の形態のカバー部材３０は、駆動ギヤ１２の外周の歯を、その下端部から矢印Ｒで示す回転方向とは反対の方向（回転方向後方）に４５°回転した位置まで覆っている。 As shown in FIG. 1, when the vehicle is traveling forward with the drive gear 12 rotating in the R direction, the entrance 40 through which the outer peripheral teeth of the drive gear 12 enter the inside of the cover member 30 is below the oil level F, Further, it is provided above the lower end portion (lowermost point) of the drive gear 12. The retreat outlet 42 through which the teeth on the outer periphery of the drive gear 12 retreat outside the cover member 30 is arranged above the oil level F. The cover member 30 of the present embodiment covers the teeth on the outer periphery of the drive gear 12 up to a position rotated by 45° in the direction opposite to the rotational direction indicated by the arrow R (rotational direction rearward) from its lower end. There is.

上記構成の動作および作用について説明する。
図５に示すように、駆動ギヤ１２が矢印Ｒの方向に回転してケース１８内に貯留されたオイル２０に突入する際、空気を巻き込んで多数の気泡が発生する。この気泡の量は、エンジンが高速回転するほど、すなわち駆動ギヤ１２の回転速度が高いほど増大する。 The operation and action of the above configuration will be described.
As shown in FIG. 5, when the drive gear 12 rotates in the direction of the arrow R and plunges into the oil 20 stored in the case 18, air is entrained and a large number of bubbles are generated. The amount of bubbles increases as the engine rotates at a higher speed, that is, as the rotational speed of the drive gear 12 increases.

ここで、図５には、上記の従来の特許文献１に記載のカバー部材３０Ａを適用した場合を一点鎖線で示している。この従来のカバー部材３０Ａのように、駆動ギヤ１２の外周の歯がカバー部材３０Ａから退出する退出口４２Ａを、油面Ｆよりも下方に配置していると、退出口４２Ａから出た気泡はオイルとともに矢印Ｓ１の向きに流れて、ストレーナ２２からオイルポンプ１６に吸い込まれるおそれがある。 Here, in FIG. 5, a case in which the cover member 30A described in the above-mentioned conventional patent document 1 is applied is shown by a one-dot chain line. Like the conventional cover member 30A, when the outlet 42A through which the teeth on the outer periphery of the drive gear 12 retract from the cover member 30A is arranged below the oil level F, bubbles generated from the outlet 42A There is a risk that the oil will flow in the direction of arrow S1 and be sucked from the strainer 22 into the oil pump 16.

これに対し、本実施の形態のカバー部材３０は、退出口４２が油面Ｆよりも上方に配置されているので、カバー部材３０の内部に入り込んだ気泡は、駆動ギヤ１２の回転に連れて退出口４２から矢印Ｓの方向に放出される。油面Ｆよりも下方に気泡が流れないので、気泡がオイルポンプ１６のストレーナ２２から吸い込まれることを従来のカバー部材３０Ａに比べて確実に抑制することができる。 On the other hand, in the cover member 30 of the present embodiment, the outlet port 42 is arranged above the oil level F, so that the bubbles that have entered the inside of the cover member 30 are accompanied by the rotation of the drive gear 12. It is discharged from the exit 42 in the direction of arrow S. Since air bubbles do not flow below the oil level F, it is possible to reliably prevent the air bubbles from being sucked from the strainer 22 of the oil pump 16 as compared with the conventional cover member 30A.

なお、上記の実施の形態において、図３に示すように、カバー部材３０の外側壁部３４と、これに対向する駆動ギヤ１２の側面１２Ａとの間隔Ｌを、駆動シャフト１４の軸受２６の長さＭよりも小さく設定してもよい。すなわちＬ＜Ｍに設定してもよい。このようにすれば、駆動シャフト１４と一体化した駆動ギヤ１２と、オイルポンプ１６のハウジング２４とを組み付ける際に、ハウジング２４から駆動シャフト１４と駆動ギヤ１２が回転軸線Ｚの方向に抜け出るのを防止することができるので、組み付け作業性が向上する。 In the above-described embodiment, as shown in FIG. 3, the distance L between the outer wall portion 34 of the cover member 30 and the side surface 12A of the drive gear 12 that faces the outer wall portion 34 is defined as the length of the bearing 26 of the drive shaft 14. It may be set smaller than the size M. That is, L<M may be set. With this configuration, when the drive gear 12 integrated with the drive shaft 14 and the housing 24 of the oil pump 16 are assembled, the drive shaft 14 and the drive gear 12 are prevented from coming out of the housing 24 in the rotation axis Z direction. Since it can be prevented, the workability of assembling is improved.

１０動力伝達装置
１２駆動ギヤ
１２Ａ，１２Ｂ側面
１４駆動シャフト
１６オイルポンプ
１８ケース
２０オイル
２２ストレーナ
２４ハウジング
２６軸受
２８外壁面
３０カバー部材
３２周壁部
３４外側壁部
３６内側壁部
３８切り欠き部
４０進入口
４２退出口
Ｆ油面 10 power transmission device 12 drive gears 12A, 12B side surface 14 drive shaft 16 oil pump 18 case 20 oil 22 strainer 24 housing 26 bearing 28 outer wall surface 30 cover member 32 peripheral wall portion 34 outer wall portion 36 inner wall portion 38 cutout portion 40 entry Mouth 42 Exit F Oil level

Claims

A drive gear that is rotationally driven by rotation of a power transmission shaft that transmits power, a drive shaft that is connected to the drive gear, and a rotational force that is transmitted from the drive gear to the drive shaft, and is stored in a case. A power transmission device including an oil pump for sucking the collected oil,
A part of the drive gear is arranged below the oil level of the oil stored in the case,
The oil pump is provided with a cover member that accommodates a lower portion of the drive gear and that covers a peripheral surface and a side surface of the lower portion.
When the drive gear rotates, the inlet of the drive gear that enters the inside of the cover member is located below the oil level, and the tooth of the drive gear exits the outside of the cover member. The exit port is arranged above the oil level.