JPS6132193Y2 - - Google Patents

Description

【考案の詳細な説明】 本考案は、自動二輪車等のバンク式車両の車輪
を駆動するギアケース内にオイル溜りを有するギ
ア室を形成すると共に、該ケースに該ギア室を大
気に開放するブリーザ通路を形成するようにした
ギアケースのブリーザ装置に関する。[Detailed description of the invention] The present invention forms a gear chamber having an oil reservoir in a gear case that drives the wheels of a bank type vehicle such as a motorcycle, and also provides a breather in the case that opens the gear chamber to the atmosphere. The present invention relates to a breather device for a gear case that forms a passage.

従来この種装置においては、ギア室内のギアの
回転に伴いオイル溜りから飛散されるオイルミス
トのブリーザ通路を介しての外部放散量を減少す
べく、該通路を比較的小径に形成するを一般とす
るが、これによれば該通路内にオイルミストが付
着凝集してオイル膜を生じ易くなりブリージング
作用の不足で昇温に伴うギア室内の内圧上昇を生
じ、又内圧上昇によれば該オイル膜が該通路の下
流端の大気開放口からはみ出し、塵埃等の付着に
より該開放口が汚れる不都合を伴う。 Conventionally, in this type of device, in order to reduce the amount of oil mist scattered from the oil reservoir as the gear in the gear chamber rotates, the passage is formed to have a relatively small diameter in order to reduce the amount of oil mist scattered through the breather passage. However, with this, oil mist adheres and aggregates within the passage, making it easy to form an oil film, resulting in an increase in internal pressure in the gear chamber due to temperature rise due to lack of breathing action, and due to the increase in internal pressure, the oil film This causes the inconvenience that the air protrudes from the atmosphere opening at the downstream end of the passage, and the opening becomes dirty due to adhesion of dust and the like.

本考案は、かゝる不都合を解消した装置を提供
することをその目的とするもので、バンク式車両
の車輪を駆動するギアケース内にオイル溜りを有
するギア室を形成すると共に該ギア室を大気に開
放するブリーザ通路をギアケースに形成させたギ
アケースのブリーザ装置において、前記ブリーザ
通路を、前記ギア室内のギアを挟んでギアの両側
に開口する少なくとも１対の分離通路と該分離通
路を合流部で合流する合流通路とに形成し、該合
流通路の下流を大気開放口に連通させると共に上
流をギアの回転中央部に開口させたことを特徴と
する。 The purpose of the present invention is to provide a device that eliminates such inconveniences, and includes forming a gear chamber having an oil reservoir in a gear case that drives the wheels of a bank type vehicle. In a gear case breather device in which a gear case is formed with a breather passage that is open to the atmosphere, the breather passage is connected to at least one pair of separation passages that open on both sides of the gear with the gear in the gear chamber interposed therebetween. It is characterized in that it is formed with a merging passage that merges at a merging part, and that the downstream side of the merging passage communicates with the atmosphere opening, and the upstream side opens at the center of rotation of the gear.

次いで本考案実施の１例を図面に付説明する。 Next, an example of implementing the present invention will be explained with reference to the drawings.

図面は自動２輪車の車前１中間部に搭載するエ
ンジン２に連なるプロペラシヤフト３と後輪４の
車軸４ａ上に軸支されるハブ４ｂとを連結するベ
ベルギア機構５のギアケース６のブリーザ装置と
して本考案装置を適用した実施例を示し、該ギア
ケース６内に、第３図に示す如く底部をオイル溜
り７とするギア室８を形成して、該ギア室８内
に、該ベベルギア機構５を構成する入力側と出力
側の１対のベベルギア９，１０を収容し、入力側
のベベルギア９をその支軸たる入力軸９ａを介し
て該プロペラシヤフト３と、出力側のベベルギア
１０をその支軸たる出力軸１０ａを介して該ハブ
４ｂとに各連結した。 The drawing shows a breather of a gear case 6 of a bevel gear mechanism 5 that connects a propeller shaft 3 connected to an engine 2 mounted in the middle part of the front 1 of a two-wheeled motor vehicle and a hub 4b supported on an axle 4a of a rear wheel 4. An embodiment in which the device of the present invention is applied is shown as a device, in which a gear chamber 8 having an oil reservoir 7 at the bottom is formed in the gear case 6 as shown in FIG. A pair of bevel gears 9 and 10 on the input side and the output side that constitute the mechanism 5 are accommodated, and the bevel gear 9 on the input side is connected to the propeller shaft 3 and the bevel gear 10 on the output side via an input shaft 9a that is a supporting shaft thereof. Each of them was connected to the hub 4b via an output shaft 10a serving as a support shaft thereof.

該各軸９ａ，１０ａは、該各ギア９，１０の軸
方向両側において該ギア室８に面する各ベアリン
グ１１により該ギアケース６に軸支されるものと
した。 The shafts 9a, 10a are supported by the gear case 6 by bearings 11 facing the gear chamber 8 on both sides of the gears 9, 10 in the axial direction.

図面で１２は該各ベアリング１１の外側のオイ
ルシールを示す。 In the drawings, reference numeral 12 indicates an outer oil seal of each bearing 11.

ここで該ギアケース６には、該ギア室８を大気
開放口１３に連通するブリーザ通路１４を形成す
るもので、この場合本考案によれば該ブリーザ通
路１４を少なくとも１対に分離して形成し、該各
ブリーザ通路１４を中間の合流部１５で互に合流
して下流端の該大気開放口１３に連通させるもの
とした。 Here, the gear case 6 is formed with a breather passage 14 that communicates the gear chamber 8 with the atmosphere opening port 13. In this case, according to the present invention, the breather passage 14 is separated into at least one pair. However, the breather passages 14 are arranged to join each other at an intermediate merging portion 15 and communicate with the atmosphere opening port 13 at the downstream end.

尚、図示のものでは該ブリーザ通路１４を、該
ギア室８の一側即ち第３図で左側に連通するＡ通
路と、右側に連通するＢ通路との１対に形成し、
車体１の左右の傾動により一方の通路がオイルの
液面で閉塞されても他方の通路を介してブリージ
ング作用が営まれるようにし、更にＢ通路はベア
リング１１の配置を介して該ギア室８に連通され
るものとし、該Ｂ通路へのオイルミストの侵入が
該ベアリング１１により可及的に防止されるよう
にした。 In the illustrated example, the breather passage 14 is formed into a pair of passage A communicating with one side of the gear chamber 8, that is, the left side in FIG. 3, and passage B communicating with the right side.
Even if one passage is blocked by the oil level due to left and right tilting of the vehicle body 1, the breathing action is performed through the other passage, and furthermore, passage B is connected to the gear chamber 8 through the arrangement of bearings 11. The bearing 11 is designed to prevent oil mist from entering the B passage as much as possible.

次いでその作動を説明するに、ブリーザ通路１
４へのオイルミストの侵入により例えばＡ通路に
第３図示の如くオイル膜ａを生ずることがある
が、この場合Ｂ通路を介してのブリージング作用
でギア室８の内圧上昇は可及的に抑制され、又該
オイル膜ａは内圧に押されて合流部１５に押し上
げられると、表面張力により該合流部１５のＢ通
路側の壁面に展伸して、第３図に仮想線で示す如
く分解され、大気開放口１３に押し出されること
なく、該合流部１５からＡ通路或いはＢ通路を至
て該ギア室８内に環流される。 Next, to explain its operation, the breather passage 1
For example, an oil film a may be formed in the A passage as shown in Fig. 3 due to the intrusion of oil mist into the gear chamber 8, but in this case, the increase in internal pressure in the gear chamber 8 is suppressed as much as possible by the breathing action via the B passage. When the oil film a is pushed up by the internal pressure to the confluence section 15, it is spread on the wall surface of the confluence section 15 on the B passage side due to surface tension, and is decomposed as shown by the imaginary line in Fig. 3. The air is not pushed out to the atmosphere opening 13, but is refluxed into the gear chamber 8 from the merging portion 15 through the A passage or the B passage.

このように本考案によるときは、バンク式車両
の車輪を駆動するギアケース６内のブリーザー通
路１４を、ギア室８内のギア１０を挾んでギアの
両側に開口する少なくとも１対の分離通路と該分
離通路を合流部１５で合流する合流通路とに形成
して該合流通路の下流を大気開放口１３に連通さ
せると共に上流をギア１０の回転中央部に開口さ
せたから、ギア１０の回転によるオイルが遠心力
で外径方向に飛散している高速運転時、及びケー
ス内の温度上昇に対し、各１対の分離通路は、大
気とオイル分の少ない場所から連通され、且つ通
路が２系以上となるので各通路を小径にしてケー
スを小型化出来、又急激なバンク方向変向時のギ
アケースが大きく傾くような場合でもオイル溜り
７のオイルはギアにさえぎられてオイルの変動を
緩慢にして分離通路の両方が油面でふさがれるこ
とがないのでブリーザー通路の確保が容易とな
り、更に一方の分離通路にオイル膜による目詰り
を生じても他方の分離通路を介してのブリージン
グ作用により内圧の上昇を可及的に抑制でき而も
このオイル膜は合流部で分離されるため、これが
大気開放口にしみ出すことが無く該開放口の目詰
りを防止できる等の効果を有する。 In this way, according to the present invention, the breather passage 14 in the gear case 6 that drives the wheels of a bank-type vehicle is formed into at least one pair of separation passages that sandwich the gear 10 in the gear chamber 8 and open on both sides of the gear. The separation passage is formed with a merging passage that merges at the merging portion 15, and the downstream side of the merging passage is communicated with the atmosphere opening 13, and the upstream side is opened at the center of rotation of the gear 10, so that oil due to the rotation of the gear 10 is During high-speed operation when oil is scattered in the outer diameter direction due to centrifugal force, and when the temperature inside the case rises, each pair of separation passages is communicated with the atmosphere from a place with a low oil content, and if there are two or more passages, Therefore, the case can be downsized by making each passage small in diameter, and even if the gear case tilts significantly during a sudden bank direction change, the oil in the oil reservoir 7 is blocked by the gear and the oil changes slowly. Since both separation passages are not blocked by oil levels, it is easy to secure a breather passage, and even if one separation passage becomes clogged with an oil film, the internal pressure is reduced by the breathing action through the other separation passage. Since this oil film is separated at the merging part, it does not seep into the atmosphere opening, which has the effect of preventing clogging of the opening.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案装置を搭載した自動２輪車の側
面図、第２図及び第３図は第１図の−線及び
−線拡大截断面図である。 ６……ギアケース、７……オイル溜り、８……
ギア室、１３……大気開放口、１４……ブリーザ
通路、１５……合流部。 FIG. 1 is a side view of a two-wheeled motor vehicle equipped with the device of the present invention, and FIGS. 2 and 3 are enlarged cross-sectional views taken along lines - and - in FIG. 1. 6... Gear case, 7... Oil reservoir, 8...
Gear room, 13... Atmosphere opening, 14... Breather passage, 15... Merging section.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] バンク式車両の車輪を駆動するギアケース内に
オイル溜りを有するギア室を形成すると共に該ギ
ア室を大気に開放するブリーザ通路をギアケース
に形成させたギアケースのブリーザ装置におい
て、前記ブリーザ通路を、前記ギア室内のギアを
挾んでギアの両側に開口する少なくとも１対の分
離通路と該分離通路を合流部で合流する合流通路
とに形成し、該合流通路の下流を大気開放口に連
通させると共に上流をギアの回転中央部に開口さ
せたことを特徴とするギアケースのブリーザ装
置。 A gear case breather device in which a gear chamber having an oil reservoir is formed in a gear case for driving wheels of a bank type vehicle, and a breather passage for opening the gear chamber to the atmosphere is formed in the gear case. , forming at least one pair of separation passages that sandwich the gear in the gear chamber and open on both sides of the gear, and a merging passage that joins the separation passage at a merging portion, and communicating the downstream side of the merging passage with the atmosphere opening port. A breather device for a gear case, characterized in that the upstream side thereof is opened at the center of rotation of the gear.