JP2023154127A

JP2023154127A - Lubrication structure of transmission

Info

Publication number: JP2023154127A
Application number: JP2022063206A
Authority: JP
Inventors: 裕之中寺; Hiroyuki Nakadera; 和彦佐藤; Kazuhiko Sato
Original assignee: Nissan Motor Co Ltd
Current assignee: Nissan Motor Co Ltd
Priority date: 2022-04-06
Filing date: 2022-04-06
Publication date: 2023-10-19

Abstract

To lubricate a first speed gear G1 by using the motion energy of a lubricant which speedily moves to the rear of a vehicle upon abrupt acceleration in a first speed stage.SOLUTION: In a manual transmission mounted to a vehicle such that a counter shaft 1 is arranged along the vehicle fore- and -aft direction, a baffle plate 2 for temporarily storing a lubricant is arranged below the counter shaft 1. A shield plate 11 having an oil sump part 15, a slope part 17 and a gutter part 16 is attached to a center part of the baffle plate 2 in the longitudinal direction. The oil sump part 15 is located at the vehicle front side of a first speed gear G1, and the gutter part 16 surrounds the lower half part of the first speed gear G1. The slope part 17 extends obliquely upward to the gutter part 16 from the oil sump part 15. As a result of the lubricant speedily moving to the rear of the vehicle upon abrupt acceleration, it runs up along the slope part 17, jumps toward the first speed gear G1, and thus lubricates the first speed gear G1.SELECTED DRAWING: Figure 8

Description

この発明は、車両にいわゆる縦置きに搭載される変速機の潤滑構造に関し、特に急加速時に特定のギヤを確実に潤滑するための潤滑構造に関する。 The present invention relates to a lubrication structure for a transmission mounted vertically on a vehicle, and particularly to a lubrication structure for reliably lubricating a specific gear during sudden acceleration.

例えばＦＲ（フロントエンジン・リヤドライブ）型自動車における手動変速機のように回転軸の軸方向が車両前後方向に沿ったものとなる変速機にあっては、車両の急加速時に、変速機ハウジングの底部に貯留されている潤滑油が加速度（いわゆる加速Ｇ）によって車両後方へ移動し、潤滑油の片寄りが生じる。そのため、通常は潤滑油中に部分的に没している例えばカウンタシャフトのギヤが一時的に油面から露出してしまう現象が生じる。 For example, in a transmission in which the axis of rotation is along the longitudinal direction of the vehicle, such as a manual transmission in an FR (front engine/rear drive) type vehicle, when the vehicle suddenly accelerates, the transmission housing The lubricating oil stored at the bottom moves toward the rear of the vehicle due to acceleration (so-called acceleration G), causing the lubricating oil to shift to one side. Therefore, a phenomenon occurs in which, for example, a gear on a countershaft, which is normally partially submerged in lubricating oil, is temporarily exposed from the oil surface.

特許文献１は、変速機ハウジングの下部にバッフルプレートを設けるとともに、このバッフルプレートの前部に、カウンタシャフト最前端のギヤの前後にそれぞれ位置する２つの堰き止め板を設けた変速機の潤滑構造を開示している。これは、登坂走行時の潤滑油の片寄りに対処したもので、変速機が傾く登坂時に相対的に下方へ移動しようとする潤滑油を堰き止めることで、最前端のギヤの露出を抑制している。 Patent Document 1 discloses a transmission lubrication structure in which a baffle plate is provided at the lower part of a transmission housing, and two dam plates are provided at the front of the baffle plate, respectively, located before and after a gear at the frontmost end of a countershaft. is disclosed. This is a solution to the uneven distribution of lubricating oil when driving uphill, and by damming up the lubricating oil that tends to move relatively downward when the transmission tilts uphill, it prevents the gear at the front end from being exposed. ing.

特許第４４９７８９６号公報Patent No. 4497896

上記の特許文献１の構成は、単に潤滑油を堰き止めるに過ぎず、潤滑油の移動を積極的にギヤの潤滑に利用したものではない。例えば、車両の急加速時には、２つの堰き止め板で仕切られた区画内に多量の潤滑油が残存していないと区画内での潤滑油の片寄りによってギヤの露出が生じることとなり、その効果は限定的である。 The configuration of Patent Document 1 described above merely dams up the lubricating oil, and does not actively utilize the movement of the lubricating oil for gear lubrication. For example, when a vehicle accelerates suddenly, if a large amount of lubricating oil does not remain in the compartment partitioned by two dam plates, the gears will be exposed due to the lubricating oil being unevenly distributed within the compartment. is limited.

この発明は、各変速段をそれぞれ構成する複数のギヤを備えたシャフトが変速機ハウジング内に収容されているとともに、このシャフトの下方に、潤滑油を一時的に溜めるためのバッフルプレートが設けられており、かつ上記シャフトが車両前後方向に沿うように車載される変速機の潤滑構造において、
上記バッフルプレートの一部として、特定のギヤの車両前方側に位置しかつ車両前後方向に延びた油溜め部と、この油溜め部から上記特定のギヤへ向かって斜め上方へと延びたスロープ部と、を備えている。 In this invention, a shaft having a plurality of gears constituting each gear stage is housed in a transmission housing, and a baffle plate for temporarily storing lubricating oil is provided below the shaft. In a lubrication structure for a transmission mounted on a vehicle such that the shaft extends along the longitudinal direction of the vehicle,
As part of the baffle plate, there is an oil sump section located in front of the vehicle of a specific gear and extending in the longitudinal direction of the vehicle, and a slope section that extends obliquely upward from the oil sump section toward the specific gear. It is equipped with.

車両の急加速時には、変速機ハウジングの底部に貯留されている潤滑油が加速度によって比較的高い速度でもって相対的に後方へと移動しようとする。このように後方へ高速で移動する潤滑油の少なくとも一部は、油溜め部からスロープ部へと案内され、スロープ部の傾斜に沿ってジャンプする。つまり、重力に逆らってスロープ部を駆け上がるように流れ、潤滑の対象とした特定のギヤへ向かって飛散する。これにより、対象とする特定のギヤが確実に潤滑される。 When the vehicle suddenly accelerates, the lubricating oil stored at the bottom of the transmission housing tends to move relatively rearward at a relatively high speed due to the acceleration. At least a portion of the lubricating oil moving rearward at high speed in this manner is guided from the oil reservoir to the slope section and jumps along the slope of the slope section. In other words, it flows up the slope section against gravity and scatters toward the specific gear targeted for lubrication. This ensures that the specific gear in question is lubricated.

この発明によれば、急加速時の潤滑油の運動エネルギを利用して潤滑油を上方へ案内し、変速機ハウジング底部よりも上方へ位置する対象とする特定のギヤへ潤滑油を確実に供給することができる。 According to this invention, the kinetic energy of the lubricating oil during sudden acceleration is used to guide the lubricating oil upward, and the lubricating oil is reliably supplied to the target specific gear located above the bottom of the transmission housing. can do.

一実施例のバッフルプレートをカウンタシャフトとともに示した斜視図。The perspective view which showed the baffle plate of one Example together with the countershaft. バッフルプレートおよびカウンタシャフトの平面図。A plan view of a baffle plate and a countershaft. 図２のＡ－Ａ線に沿った断面図。3 is a sectional view taken along line AA in FIG. 2. FIG. 図２のＢ－Ｂ線に沿った断面図。3 is a sectional view taken along line BB in FIG. 2. FIG. バッフルプレートの斜視図。A perspective view of a baffle plate. バッフルプレート本体の斜視図。A perspective view of the baffle plate main body. 遮蔽板の斜視図。A perspective view of a shielding plate. 急加速時の潤滑油の流れを示す説明図。An explanatory diagram showing the flow of lubricating oil during sudden acceleration.

以下、この発明をＦＲ型自動車用の手動変速機に適用した一実施例について図面を参照して説明する。一実施例の手動変速機は、互いに平行なメインシャフト（インプットシャフトおよびアウトプットシャフト）とカウンタシャフトとが変速機ハウジング内に収容され、かつカウンタシャフトが相対的に下方に位置する一般的な構成であって、下方に位置するカウンタシャフトの一部が油中に没するように変速機ハウジングの底部に潤滑油が貯留されている。メインシャフトおよびカウンタシャフトは、各変速段をそれぞれ構成する複数のギヤを備えており、メインシャフト側のギヤとカウンタシャフト側のギヤとは互いに常時噛み合っている。基本的には、変速機ハウジングの底部に貯留されている潤滑油にカウンタシャフトの各ギヤの外周の一部が没していることで、各ギヤの潤滑がなされる。 Hereinafter, an embodiment in which the present invention is applied to a manual transmission for an FR type automobile will be described with reference to the drawings. An example of a manual transmission has a general configuration in which a main shaft (an input shaft and an output shaft) and a countershaft that are parallel to each other are housed in a transmission housing, and the countershaft is located relatively downward. Lubricating oil is stored at the bottom of the transmission housing so that a portion of the countershaft located below is submerged in the oil. The main shaft and the countershaft each include a plurality of gears constituting each gear stage, and the gears on the main shaft side and the gears on the countershaft side are always in mesh with each other. Basically, each gear is lubricated by partially submerging the outer periphery of each gear on the countershaft in lubricating oil stored at the bottom of the transmission housing.

図１は、カウンタシャフト１とその下方に設けられるバッフルプレート２とを示した斜視図である。バッフルプレート２は、登坂時等に潤滑油をカウンタシャフト１の周囲に一時的に溜めるように図示せぬ変速機ハウジングの底面（内側面）に沿って設けられるもので、概略、カウンタシャフト１と同心の円弧形断面形状を有する樋状をなし、金属板例えば鋼板のプレス成形品として構成されている。一実施例のバッフルプレート２は、カウンタシャフト１の軸方向に沿った潤滑油の移動を適当に制限するように、軸方向に直交する方向に沿った２つの仕切り板８，９を車両前方側となる一端部に備えている。 FIG. 1 is a perspective view showing a countershaft 1 and a baffle plate 2 provided below it. The baffle plate 2 is provided along the bottom surface (inner surface) of the transmission housing (not shown) so as to temporarily store lubricating oil around the countershaft 1 when climbing a slope, etc., and is roughly connected to the countershaft 1. It has a trough-like shape with a concentric arcuate cross-section, and is constructed as a press-formed product of a metal plate, such as a steel plate. The baffle plate 2 of one embodiment has two partition plates 8 and 9 along a direction perpendicular to the axial direction of the countershaft 1 on the front side of the vehicle so as to appropriately restrict the movement of lubricating oil along the axial direction of the countershaft 1. It is provided at one end.

カウンタシャフト１は、例えば１速～６速および後進用のギヤを備えているが、図１では、説明の単純化のために、１速ギヤＧ１と２速ギヤＧ２と３速ギヤＧ３のみを図示してあり、特に、ギヤ歯を省略した単純な円盤状ないし円筒状に各ギヤを図示してある。変速機は、カウンタシャフト１が車両前後方向に沿うように車載されるが、この車載状態において、２速ギヤＧ２が１速ギヤＧ１の車両前方側に位置している。２速ギヤＧ２のさらに車両前方側には、図示しない６速ギヤおよび５速ギヤが位置する。なお、６速ギヤはバッフルプレート２の２つの仕切り板８，９の間に位置し、５速ギヤは仕切り板９よりも車両前方側に位置する。３速ギヤＧ３は、１速ギヤＧ１の車両後方側に位置している。３速ギヤＧ３のさらに車両後方側には、図示しない４速ギヤが位置する。カウンタシャフト１におけるこれらのギヤの中では、１速ギヤＧ１が最も小径である。 The countershaft 1 includes, for example, 1st to 6th gears and reverse gears, but in FIG. 1, only the 1st gear G1, 2nd gear G2, and 3rd gear G3 are shown to simplify the explanation. In particular, each gear is shown in a simple disk-like or cylindrical shape, with gear teeth omitted. The transmission is mounted on a vehicle so that the countershaft 1 extends along the longitudinal direction of the vehicle, and in this mounted state, the second gear G2 is located in front of the first gear G1 in the vehicle. A 6th gear and a 5th gear (not shown) are located further forward of the vehicle than the 2nd gear G2. Note that the 6th gear is located between the two partition plates 8 and 9 of the baffle plate 2, and the 5th gear is located closer to the front of the vehicle than the partition plate 9. Third gear G3 is located on the vehicle rear side of first gear G1. A fourth gear (not shown) is located further to the rear of the vehicle than the third gear G3. Among these gears on the countershaft 1, the first gear G1 has the smallest diameter.

図１に示すように、バッフルプレート２の一方の側縁には、カウンタシャフト１のギヤの回転に伴って描き上げられた潤滑油を回収してギヤ外周面に供給する油路を構成する合成樹脂性のオイルガータ３が取り付けられている。オイルガータ３は、本発明の要部ではないので詳細には説明しないが、車両後方寄りとなる上方に向かって開口した油受け部４において主に３速ギヤＧ３および４速ギヤ（図示せず）が描き上げた潤滑油を回収し、車両前後方向の３箇所に設けられた油出口５，６，７から各ギヤへ潤滑油を供給する。油出口５から１速ギヤＧ１へ潤滑油が導かれ、油出口６から２速ギヤＧ２へ潤滑油が導かれ、油出口７から図示しない６速ギヤおよび５速ギヤへ潤滑油が導かれる。なお、バッフルプレート２は、３速ギヤＧ３および４速ギヤに対応する部位の付近に、バッフルプレート２の下側（換言すれば外側）からバッフルプレート２の内側へ潤滑油が戻るように複数の開口部１０（図５参照）を備えている。 As shown in Fig. 1, one side edge of the baffle plate 2 has a composite oil passage that collects the lubricating oil drawn as the gear of the countershaft 1 rotates and supplies it to the outer peripheral surface of the gear. A resin oil gutter 3 is attached. The oil gutter 3 is not a main part of the present invention and will not be described in detail, but the oil gutter 3 is mainly used for the third gear G3 and the fourth gear (not shown) in the oil receiving part 4 that opens upward and is located near the rear of the vehicle. ) is collected and supplied to each gear from oil outlets 5, 6, and 7 provided at three locations in the longitudinal direction of the vehicle. Lubricating oil is led from the oil outlet 5 to the first gear G1, from the oil outlet 6 to the second gear G2, and from the oil outlet 7 to the sixth and fifth gears (not shown). The baffle plate 2 has a plurality of lubricating oils near the parts corresponding to the third gear G3 and the fourth gear so that the lubricating oil returns from the lower side (in other words, the outside) to the inside of the baffle plate 2. It has an opening 10 (see FIG. 5).

図２は、カウンタシャフト１およびバッフルプレート２の平面図であり、この図２では、オイルガータ３は図示省略してある。図３は、図２のＡ－Ａ線に沿った縦断面図、図４は、図２のＢ－Ｂ線に沿った横断面図である。図２および図３に示すように、バッフルプレート２は、３速ギヤＧ３や４速ギヤに対応する車両後方側の部分が車両前方側の部分よりも幅広でかつ下方へ多少下がった形に構成されている。 FIG. 2 is a plan view of the countershaft 1 and the baffle plate 2, and in this FIG. 2, the oil gutter 3 is omitted from illustration. 3 is a longitudinal sectional view taken along line AA in FIG. 2, and FIG. 4 is a cross sectional view taken along line BB in FIG. 2. As shown in FIGS. 2 and 3, the baffle plate 2 is configured such that the rear part of the vehicle corresponding to the third gear G3 and the fourth gear is wider than the front part of the vehicle and is slightly lowered. has been done.

図３における線Ｏ／Ｌは、車両停止状態における変速機ハウジング内の潤滑油の油面位置を示している。油面Ｏ／Ｌは、カウンタシャフト１の軸中心よりも上方に設定されており、カウンタシャフト１側の各ギヤとメインシャフト側の各ギヤとの噛み合い部分は油中に没しないものの、カウンタシャフト１側の各ギヤの下側半分以上が油中に没する程度に油面位置Ｏ／Ｌが設定されている。 The line O/L in FIG. 3 indicates the position of the lubricating oil level in the transmission housing when the vehicle is stopped. The oil level O/L is set above the axial center of the countershaft 1, and although the meshing parts between each gear on the countershaft 1 side and each gear on the main shaft side are not submerged in oil, the countershaft The oil level position O/L is set to such an extent that more than half of the lower side of each gear on the first side is submerged in oil.

次に、本発明の要部である遮蔽板１１について、図５～図７を参照して説明する。図５に示すように、１速ギヤＧ１および２速ギヤＧ２の位置に対応するバッフルプレート２の長手方向中央部に、金属板例えば鋼板のプレス成形品からなる遮蔽板１１が設けられている。すなわち、図示例では、バッフルプレート２は、図６に示すバッフルプレート本体２Ａと、このバッフルプレート本体２Ａの底面内側に重ねて取り付けられた遮蔽板１１と、から構成されている。詳しくは、遮蔽板１１は、スポット溶接用の台形状に凹んだ凹部１２を２箇所に有し、この凹部１２の底壁が、バッフルプレート本体２Ａに設けられた２箇所の円盤状凸部１３の頂面に重ねられて互いにスポット溶接されている。 Next, the shielding plate 11, which is the main part of the present invention, will be explained with reference to FIGS. 5 to 7. As shown in FIG. 5, a shielding plate 11 made of a press-formed metal plate, for example, a steel plate, is provided at the longitudinal center of the baffle plate 2 corresponding to the positions of the first gear G1 and the second gear G2. That is, in the illustrated example, the baffle plate 2 includes a baffle plate main body 2A shown in FIG. 6, and a shielding plate 11 attached to the inside of the bottom surface of the baffle plate main body 2A in an overlapping manner. Specifically, the shielding plate 11 has two trapezoidal concave portions 12 for spot welding, and the bottom wall of the concave portions 12 is connected to two disc-shaped convex portions 13 provided on the baffle plate main body 2A. are overlaid on the top surface and spot welded to each other.

図６および図５に示すように、遮蔽板１１は、カウンタシャフト１の同心円にほぼ沿った略半円筒形をなす油溜め部１５と、この油溜め部１５よりも半径が小さくかつカウンタシャフト１の同心円にほぼ沿った略半円筒形をなす樋部１６と、これらの油溜め部１５と樋部１６とを接続したスロープ部１７と、を備えている。スロープ部１７は、油溜め部１５から樋部１６へ向かって先細り形状をなすように延びている。換言すれば、スロープ部１７は、カウンタシャフト１と同心の円錐面に沿った形状をなしている。 As shown in FIGS. 6 and 5, the shielding plate 11 includes an oil reservoir 15 that is approximately semi-cylindrical along the concentric circle of the countershaft 1, and an oil reservoir 15 that has a smaller radius than the oil reservoir 15 and that is connected to the countershaft 1. The gutter section 16 has a substantially semi-cylindrical shape substantially along the concentric circle, and the slope section 17 connects the oil reservoir section 15 and the gutter section 16. The slope portion 17 extends from the oil reservoir portion 15 toward the gutter portion 16 in a tapered shape. In other words, the slope portion 17 has a shape along a conical surface concentric with the countershaft 1.

また、樋部１６の車両後方側の円弧形をなす先端には、内周側へ向かって一定幅で立ち上がった折曲フランジ１８が設けられている。 Furthermore, a bent flange 18 is provided at the arc-shaped tip of the gutter portion 16 on the rear side of the vehicle, rising up with a constant width toward the inner circumferential side.

遮蔽板１１がカウンタシャフト１と組み合わされた状態においては、図１～図３に示すように、油溜め部１５が２速ギヤＧ２の下方に位置し、２速ギヤＧ２の外周面（歯先円）の下半部を囲っている。樋部１６は、２速ギヤＧ２よりも車両後方側に位置する１速ギヤＧ１の下方に位置し、１速ギヤＧ１の外周面（歯先円）の下半部を囲っている。そして、スロープ部１７は、２速ギヤＧ２と１速ギヤＧ１との間に位置し、２速ギヤＧ２から１速ギヤＧ１へ向かって徐々に収束していく形状をなしている。 When the shielding plate 11 is combined with the countershaft 1, the oil reservoir 15 is located below the second gear G2, as shown in FIGS. encloses the lower half of the circle). The gutter portion 16 is located below the first gear G1, which is located toward the rear of the vehicle than the second gear G2, and surrounds the lower half of the outer circumferential surface (tip circle) of the first gear G1. The slope portion 17 is located between the second gear G2 and the first gear G1, and has a shape that gradually converges from the second gear G2 toward the first gear G1.

図３に示すように、油溜め部１５は、中央のスロープ部１７から車両前方へ向かって延びており、その先端縁１５ａは、バッフルプレート本体２Ａの底面よりも上方に位置している。また、２速ギヤＧ２の外周面との間には、車両前方からの潤滑油の流入を可能とするように、比較的大きな間隔が設けられている。なお、図示例では、油溜め部１５は、先端縁１５ａ側が僅かに拡がった僅かなテーパ形状をなしている。 As shown in FIG. 3, the oil reservoir portion 15 extends toward the front of the vehicle from the central slope portion 17, and its tip edge 15a is located above the bottom surface of the baffle plate main body 2A. Further, a relatively large gap is provided between the second gear G2 and the outer circumferential surface of the second gear G2 so as to allow lubricating oil to flow in from the front of the vehicle. In the illustrated example, the oil reservoir portion 15 has a slightly tapered shape in which the tip edge 15a side is slightly widened.

樋部１６は、図３に示すように、スロープ部１７との境界となる一端１６ａが１速ギヤＧ１の車両前方側の端面付近に位置し、他端となる折曲フランジ１８が１速ギヤＧ１の車両後方側の端面付近でかつ１速ギヤＧ１の外周面と軸方向で重なっている位置に位置している。樋部１６と１速ギヤＧ１の外周面との間の間隔は、油溜め部１５と２速ギヤＧ２外周面との間の間隔に比較して小さく設定されており、１速ギヤＧ１の外周面の下半部を当該１速ギヤＧ１に比較的近い位置で覆っている。折曲フランジ１８は、カウンタシャフト１の中心軸と直交する平面に沿っており、１速ギヤＧ１の外周面に向かって立ち上がっている。図４に示すように、折曲フランジ１８は、半円状に１速ギヤＧ１の外周面下半部を囲っている。 As shown in FIG. 3, one end 16a of the gutter portion 16, which is the boundary with the slope portion 17, is located near the end surface on the vehicle front side of the first gear G1, and the bent flange 18, which is the other end, is located near the end surface on the vehicle front side of the first gear G1. It is located near the end surface of G1 on the vehicle rear side and at a position overlapping the outer circumferential surface of first speed gear G1 in the axial direction. The distance between the gutter portion 16 and the outer peripheral surface of the first gear G1 is set to be smaller than the distance between the oil sump portion 15 and the outer peripheral surface of the second speed gear G2. The lower half of the surface is covered at a position relatively close to the first gear G1. The bent flange 18 extends along a plane perpendicular to the central axis of the countershaft 1, and rises toward the outer circumferential surface of the first gear G1. As shown in FIG. 4, the bent flange 18 surrounds the lower half of the outer peripheral surface of the first gear G1 in a semicircular shape.

また、スロープ部１７は、図３に示す縦断面においては、油溜め部１５の後端から車両後方へ向かって斜め上方へと直線状に延びている。この直線状に延びたスロープ部１７の延長線は、１速ギヤＧ１の外周面つまり歯先円に沿った円筒面に交差する。また、平面視では、図２に明らかなように、車両後方へ向かうに従って幅寸法が徐々に小さくなるように収束していく。 Further, in the longitudinal section shown in FIG. 3, the slope portion 17 extends obliquely upward in a straight line from the rear end of the oil reservoir portion 15 toward the rear of the vehicle. The extension line of this linearly extending slope portion 17 intersects the outer circumferential surface of the first speed gear G1, that is, the cylindrical surface along the tip circle. Furthermore, in a plan view, as is clear from FIG. 2, the width gradually converges to become smaller toward the rear of the vehicle.

上記の遮蔽板１１は、特に、１速段を用いた急加速時に１速ギヤＧ１（およびその噛み合い部分）を確実に潤滑することに寄与する。すなわち、車両の急加速時には、変速機ハウジングの底部に貯留されている潤滑油が加速度によって比較的高い速度でもって車両後方側へ移動しようとする。このとき、変速機ハウジングの比較的前方寄りにあった潤滑油の一部が車両前方へ向かって開口した先端縁１５ａから油溜め部１５の内側に入り、スロープ部１７に沿って高速で流れる結果、図８の説明図に矢印で示すように、スロープ部１７をかけ上がって１速ギヤＧ１へ向かってジャンプし、１速ギヤＧ１とりわけその外周面に衝突する。従って、加速に際して使用されている１速ギヤＧの歯先ひいてはメインシャフト側の１速ギヤとの噛み合い部分が確実に潤滑される。 The shielding plate 11 described above particularly contributes to reliably lubricating the first gear G1 (and its meshing portion) during rapid acceleration using the first gear. That is, when the vehicle suddenly accelerates, the lubricating oil stored at the bottom of the transmission housing tends to move toward the rear of the vehicle at a relatively high speed due to the acceleration. At this time, a portion of the lubricating oil that was relatively close to the front of the transmission housing enters the inside of the oil reservoir portion 15 from the tip edge 15a that opens toward the front of the vehicle, and flows at high speed along the slope portion 17. , as shown by the arrow in the explanatory diagram of FIG. 8, climbs up the slope portion 17 and jumps toward the first gear G1, colliding with the first gear G1, especially its outer peripheral surface. Therefore, the teeth of the first speed gear G used during acceleration, as well as the meshing portion with the first speed gear on the main shaft side, are reliably lubricated.

カウンタシャフト１の１速ギヤＧは小径であり、変速機ハウジングの底面から離れたものとなりがちであるが、上記のようにスロープ部１７を介して潤滑油の運動エネルギを利用することで相対的に高い位置にある１速ギヤＧを確実に潤滑することができる。 The first gear G of the countershaft 1 has a small diameter and tends to be separated from the bottom of the transmission housing. It is possible to reliably lubricate the first gear G located at a high position.

また、平面視においても、図２に明らかなように、油溜め部１５で補足された潤滑油が１速ギヤＧへと集中的に案内されることとなる。 Furthermore, as is clear from FIG. 2 in plan view, the lubricating oil supplemented by the oil reservoir 15 is guided intensively to the first gear G.

また、上記実施例では、樋部１６が１速ギヤＧの外周面下半部を囲っているため、スロープ部１７を介して後方へ流れてきた潤滑油が１速ギヤＧの外周面付近により確実に保持される。しかも、後方へ向かう潤滑油が折曲フランジ１８によって堰き止められて内周側へ向かうこととなり、１速ギヤＧの外周面により多くの潤滑油が案内される。 In addition, in the above embodiment, since the gutter portion 16 surrounds the lower half of the outer peripheral surface of the first gear G, the lubricating oil flowing rearward via the slope portion 17 is transferred to the vicinity of the outer peripheral surface of the first gear G. Reliably held. Furthermore, the lubricating oil flowing rearward is blocked by the bent flange 18 and directed toward the inner circumferential side, so that more lubricating oil is guided to the outer circumferential surface of the first gear G.

なお、図示例では、図４に示すように、オイルガータ３の油出口５から１速ギヤＧ１へ向けて供給された潤滑油が樋部１６に流れ込むようになっている。 In the illustrated example, as shown in FIG. 4, the lubricating oil supplied from the oil outlet 5 of the oil gutter 3 toward the first gear G1 flows into the gutter portion 16.

このように、上記実施例では、バッフルプレート２の底部に遮蔽板１１を設けることで、１速段を用いた急加速時に最も負荷が高いものとなる１速ギヤＧ１（およびその噛み合い部分）を確実にかつ効率良く潤滑することができる。 In this way, in the above embodiment, by providing the shielding plate 11 at the bottom of the baffle plate 2, the first gear G1 (and its meshing portion), which is subjected to the highest load during sudden acceleration using the first gear, is protected. Lubrication can be performed reliably and efficiently.

なお、上記実施例では、スロープ部１７による潤滑対象として急加速時に使用されることが多い１速ギヤＧ１が選択されているが、２速ギヤＧ２等他の変速段のギヤを特定のギヤとして潤滑対象としてもよい。 In the above embodiment, the first gear G1, which is often used during sudden acceleration, is selected as the object to be lubricated by the slope portion 17, but other gears such as the second gear G2 may be selected as specific gears. It may also be used as a lubrication target.

また、バッフルプレート２に複数例えば２個のスロープ部を設けて急加速時に複数のギヤに潤滑油供給を行うようにしてもよい。 Furthermore, the baffle plate 2 may be provided with a plurality of slope portions, for example two slope portions, to supply lubricating oil to a plurality of gears during sudden acceleration.

以上、この発明の一実施例を詳細に説明したが、この発明は上記実施例に限定されるものではなく、種々の変更が可能である。例えば、請求項における「シャフト」は上記実施例のようなカウンタシャフトに限定されず、他のシャフトであってもよい。また、例えば、インプットシャフトとアウトシャフトとカウンタシャフトとの３軸が平行に配置された構成であってもよく、変速段つまり噛み合っているギヤの切換がアクチュエータを介して行われる構成であってもよい。さらに、スロープ部は円錐形でなく単純な平板状の構成としてもよい。 Although one embodiment of the present invention has been described above in detail, the present invention is not limited to the above embodiment, and various modifications can be made. For example, the "shaft" in the claims is not limited to the countershaft as in the above embodiments, but may be other shafts. Further, for example, a configuration may be adopted in which three axes, an input shaft, an outshaft, and a countershaft, are arranged in parallel, or a configuration in which the gears, that is, the gears that are engaged, are changed via an actuator. good. Furthermore, the slope portion may have a simple flat plate configuration instead of a conical configuration.

１…カウンタシャフト
２…バッフルプレート
２Ａ…バッフルプレート本体
３…オイルガータ
１１…遮蔽板
１５…油溜め部
１６…樋部
１７…スロープ部
１８…折曲フランジ
Ｇ１…１速ギヤ
Ｇ２…２速ギヤ 1... Counter shaft 2... Baffle plate 2A... Baffle plate body 3... Oil gutter 11... Shielding plate 15... Oil reservoir portion 16... Gutter portion 17... Slope portion 18... Bent flange G1... 1st speed gear G2... 2nd speed gear

Claims

A shaft equipped with a plurality of gears constituting each gear stage is housed in the transmission housing, and a baffle plate for temporarily storing lubricating oil is provided below the shaft. In the lubrication structure of a transmission mounted on a vehicle such that the shaft runs along the longitudinal direction of the vehicle,
As part of the baffle plate, there is an oil sump section located in front of the vehicle of a specific gear and extending in the longitudinal direction of the vehicle, and a slope section that extends obliquely upward from the oil sump section toward the specific gear. A transmission lubrication structure comprising:

The oil reservoir has a substantially semi-cylindrical shape substantially along the concentric circle of the shaft, and the slope portion has a tapered shape extending from the oil reservoir toward the tip circle of the specific gear. ,
A lubrication structure for a transmission according to claim 1.

The slope portion extends linearly in a cross section along the longitudinal direction of the vehicle, and its extension line intersects the cylindrical surface of the tooth tip of the specific gear.
A lubrication structure for a transmission according to claim 1.

The specific gear mentioned above is a first speed gear,
A lubrication structure for a transmission according to claim 1.

2. The transmission lubrication structure according to claim 1, further comprising a substantially semi-cylindrical gutter section extending from the tip of the slope section to cover the lower part of the specific gear.

The baffle plate is composed of a baffle plate main body and a shielding plate provided inside the baffle plate main body,
The shielding plate includes the oil reservoir portion and the slope portion.
A lubrication structure for a transmission according to claim 1.

The shaft is a countershaft located at the bottom of the transmission housing.
A lubrication structure for a transmission according to claim 1.

The above specific gear is the 1st gear,
The oil reservoir is located below the second gear, which is adjacent to the front side of the vehicle from the first gear.
A lubrication structure for a transmission according to claim 1.