JP2014119085A - Vehicular transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently supply oil to lubricated parts in a vehicular transmission even at a low vehicle speed at which a final gear makes low rotation.SOLUTION: An oil guide member (14) for guiding the oil scooped up by the final gear (10) to the lubricated part (7, 12) is arranged between the final gear (10) and a side wall (3) of a transmission case (2). The oil guide member (14) has oil passages (15A-15D), is provided with oil inlet parts (18A-18D) at a lower end (17), which are opened to face an oil level (F) on a side that the final gear (10) scoops up the oil, and is provided with oil outlet parts (20A-20D) at an upper end (19), which are opened near a ceiling part (21) of the transmission case (2). The oil passages (15A-15D) are formed to gradually reduce in opening cross section from the oil inlet parts (18A-18D) toward the oil outlet parts (20A-20D).

Description

  The present invention relates to a vehicular transmission, and more particularly to a vehicular transmission that supplies oil to be lubricated to a portion to be lubricated by a final gear.

As a transmission mounted on a vehicle, a countershaft includes an input shaft that is rotated by a drive source in a transmission case, and a counter gear that transmits rotation of the input shaft through a gear mechanism attached to the input shaft. And a drive shaft provided with a final gear to which the rotation of the counter shaft is transmitted.
Such transmission lubrication is generally performed by scooping up the oil remaining in the transmission case by a final gear. However, there is a lubricated part where the oil does not reach only with the oil that is swept up by the final gear, and in order to lubricate the lubricated part that the oil does not reach, the oil that is swept up by the final gear is used. They are collected in oil gutter and supplied as a slide.
As a structure of such a transmission, there are the following prior art documents.

JP 2006-71038 A

  In the manual transmission lubrication device according to Patent Document 1, the oil scraped up by the final gear is used as an unsealed gutter plate (corresponding to “oil gutter”) provided above the counter shaft and on the ceiling of the transmission case. In other words, the portion to be lubricated is lubricated by flowing the oil from a high position to a low position.

By the way, in the above-mentioned Patent Document 1, lubrication cannot be performed unless the oil scooped up by the final gear reaches the gutter plate (corresponding to “oil gutter”) provided on the ceiling portion of the transmission case. Structure. For this reason, at the low vehicle speed at which the final gear is at a low speed, the momentum of the oil scraped up by the final gear is weak, and the oil cannot be sufficiently splashed upward by the rotation of the final gear. It was not possible to guide to the ceiling side in the case, that is, the gutter plate (corresponding to “oil gutter”) side. As a result, at a low vehicle speed at which the final gear has a low rotation speed, it becomes difficult to supply oil to the lubricated part, and the lubricated part cannot be sufficiently lubricated.
Particularly in recent years, there has been a tendency for the oil level of the oil in the transmission case to decrease in order to improve the fuel efficiency by reducing the oil stirring resistance of the transmission. For this reason, since it becomes difficult to scoop up oil to the ceiling part of a transmission case at the time of the low vehicle speed which a final gear becomes low rotation, the improvement was desired.

  Accordingly, an object of the present invention is to sufficiently lubricate a lubricated portion by guiding oil scooped up by the final gear to the ceiling side of the transmission case even at a low vehicle speed at which the final gear has a low rotation speed. An object of the present invention is to provide a vehicular transmission that can be used.

  The present invention relates to a counter shaft including an input shaft that is rotated by a driving source, a counter gear that transmits rotation of the input shaft via a gear mechanism attached to the input shaft, and a final gear that transmits rotation of the counter shaft. In a vehicle transmission having a drive shaft provided with a drive shaft provided in a transmission case, oil that is scraped up by the final gear between the final gear and a side wall of the transmission case located above the final gear. An oil guide member for guiding the oil to the lubricated portion is disposed, and the oil guide member has an oil passage formed from a cylindrical space, and is directed toward the oil surface on the side where the final gear scoops up the oil at the lower end portion. An oil inlet is provided in the oil passage that opens, and an upper end An oil outlet portion of the oil passage that opens near the ceiling portion of the transmission case is provided, and the oil passage is formed so that an opening cross-sectional area gradually decreases from the oil inlet portion toward the oil outlet portion. It is characterized by.

  According to the present invention, even at the time of low vehicle speed at which the final gear has a low rotation speed, the oil scraped up by the final gear can be guided to the ceiling portion side of the transmission case to sufficiently lubricate the lubricated portion.

FIG. 1 is a perspective view of the transmission from the left side. (Example) FIG. 2 is a left side view of the transmission at a high vehicle speed at which the final gear rotates at a high speed. (Example) FIG. 3 is a left side view of the transmission at a low vehicle speed at which the final gear has a low rotation. (Example) FIG. 4 is a front view of the oil guide member. (Example) FIG. 5 is a sectional view of the oil guide member taken along line VV in FIG. (Example)

  The purpose of this invention is to guide the oil scraped up by the final gear to the ceiling side of the transmission case and sufficiently lubricate the lubricated part even at low vehicle speeds when the final gear has a low rotation speed. This is realized by forming the oil passage of the guide member so that the opening cross-sectional area gradually decreases from the oil inlet portion toward the oil outlet portion.

1 to 5 show an embodiment of the present invention.
As shown in FIG. 1, a vehicle such as a hybrid vehicle is equipped with a transmission 1 that is connected to a lateral drive source. The transmission 1 is arranged such that its axial direction is in the vehicle left-right direction.
The transmission 1 includes a transmission case 2 whose one side is joined to a drive source, and an end case (not shown) joined to the other side of the transmission case 2 away from the drive source.
The transmission case 2 is an annular body and includes a side wall 3 having a predetermined width. The side wall 3 is formed with a one-side joint 4 on the drive source side and an other-side joint 5 on the end case side.
The transmission case 2 includes an input shaft 6 that is rotated by a drive source, and a counter gear 8 to which the rotation of the input shaft 6 is transmitted via a planetary gear mechanism 7 that is a gear mechanism attached to the input shaft 6. A counter shaft 9 and a drive shaft 11 including a final gear 10 to which the rotation of the counter shaft 9 is transmitted are arranged.
In this embodiment, when the input shaft 6, the counter shaft 9 and the drive shaft 11 are arranged, as shown in FIGS. 1 and 2, the input shaft 6 has the counter shaft 9 and the drive shaft in the left side view. 11, the countershaft 9 is located behind and diagonally above the input shaft 6, the drive shaft 11 is located behind and diagonally below the input shaft 6, and the counter The shaft 9 and the drive shaft 11 are positioned so as to overlap in the vehicle vertical direction.
Further, the input shaft 6, the counter shaft 9 and the drive shaft 11 are also extended in the end case. The planetary gear mechanism 7, the counter gear 8, and the final gear 10 are disposed in the vicinity of the other side joint portion 5 of the transmission case 2 so as to overlap in the vehicle vertical direction.

The input shaft 6 is provided with a motor 12 in the end case.
As shown in FIG. 2, lubricating oil stays in the transmission case 2. And the part used as the lower part of the final gear 10 is arrange | positioned in the oil below the oil level F in oil. Accordingly, when the final gear 10 rotates (indicated by the direction of rotation of the arrow in FIG. 2), the oil in the transmission case 2 is scraped up by the final gear 10.

As shown in FIG. 2, an oil guide member 14 is disposed between the final gear 10 and the rear portion 13 of the other side joint portion 5 as the side wall 3 of the transmission case 2 positioned above the final gear 10. Is done. The oil guide member 14 guides the oil scraped up by the final gear 10 to the lubricated part (for example, the planetary gear mechanism 7). Note that the lubricated portion is not limited to the planetary gear mechanism 7, and may be another location, or may be each location of the transmission without the planetary gear mechanism 7.
As shown in FIG. 1, the oil guide member 14 has a width dimension substantially the same as the width dimension of the final gear 10 and is formed in a cross-sectional arc shape so as to follow the rear portion 13 of the other-side joint portion 5. It is oriented in the vehicle up-down direction along the rear portion 13 of the side joint portion 5 and accommodated in the other side joint portion 5.

As shown in FIGS. 4 and 5, the oil guide member 14 includes, for example, a plurality of oil passages 15 </ b> A to 15 </ b> D as oil passages formed from a cylindrical space inside.
The oil passages 15A to 15D are formed by a plurality of oil passage pipe portions 16A to 16D arranged in the width direction of the oil guide member 14. The number of oil passage pipe portions can be changed according to the width dimension of the final gear 10. Further, a plurality of oil pipes can be connected side by side instead of the oil passage pipe portion.
Oil inlets 18 </ b> A to 18 </ b> D of oil passages 15 </ b> A to 15 </ b> D are provided at the lower end 17 of the oil guide member 14. The oil inlet portions 18A to 18D are open toward the oil surface F of the oil staying in the transmission case 2 on the side where the final gear 10 scoops up the oil.
Further, oil outlet portions 20A to 20D of oil passages 15A to 15D are provided at the upper end portion 19 of the oil guide member 14. The oil outlet portions 20 </ b> A to 20 </ b> D are opened near the ceiling portion 21 of the other side joint portion 5 of the transmission case 2.
As shown in FIGS. 4 and 5, the oil passages 15A to 15D are set such that the diameter D1 of the oil inlet portions 18A to 18D is larger than the diameter D2 of the oil outlet portions 20A to 20D, respectively. The opening cross-sectional area is narrowed so as to gradually decrease from ˜18D to the oil outlet portions 20A to 20D. That is, the oil passages 15 </ b> A to 15 </ b> D are formed in the shape of a tip stop.

As shown in FIGS. 2, 4, and 5, the oil inlet portions 18 </ b> A to 18 </ b> D are located above the oil level F and efficiently introduce the oil scraped up by the final gear 10. The final gear 10 is directed toward the direction (oil agitation direction) in which the final gear 10 rotates at the rear portion 13 of the other side joint portion 5 of the transmission case 2 so as to have a strong flow, that is, in the vertical direction. Opening downward in the tangential direction. The oil outlet portions 20A to 20D are arranged so that the oil in the oil passages 15A to 15D flows efficiently forward and upward in the transmission case 2 and is supplied to the planetary gear mechanism 7 that is a lubricated portion. It opens toward the ceiling part 21.
The oil passages 15A to 15D are formed to be narrowed so that the opening cross-sectional area gradually decreases from the oil inlet portions 18A to 18D toward the oil outlet portions 20A to 20D. The flow rate of the oil is led from the low position to the high position, and the oil is discharged from the oil outlet portions 20A to 20D vigorously.

As shown in FIGS. 1 and 2, an oil gutter 22 that extends from the upper side of the final gear 10 to the upper side of the planetary gear mechanism 7 that is a lubricated portion is attached to the ceiling portion 21 side of the transmission case 2.
The oil gutter 22 is formed to bend and extend from the lower side of the final gear 10 side to the rear portion 13 of the other side joint portion 5 and the upper side of the ceiling portion 21, and is accommodated in the other side joint portion 5.
In this embodiment, the oil gutter 22 is formed, for example, in an L-shaped cross section, and is continuously provided so as to be orthogonal to the mounting portion 23 attached to the transmission case 2 by a predetermined fixing means. A bottom-like oil groove space 25 that opens upward is formed in cooperation with an end cover that is joined to the joining surface of the other-side joining portion 5.
The oil gutter 22 includes a vertical portion 26 that extends upward in the vertical direction from the lower side of the final gear 10, and a horizontal portion 27 that extends in the horizontal direction from the upper end of the vertical portion 26 to the motor 12 side.
The horizontal portion 27 has two oil distribution pipes 28 and 28 arranged in the left-right direction of the vehicle so as to guide the oil flowing through the horizontal portion 27 to the motor 12 side as another lubricated portion. Communicate.
The oil guide member 14 is extended to the height position of the horizontal portion 27 of the oil gutter 22. That is, the upper end portion 19 of the oil guide member 14 is disposed at the height position of the horizontal portion 27 of the oil gutter 22. Further, the oil outlet portion 20 of the oil guide member 14 is opened toward the horizontal portion 27 side of the oil gutter 22.

  In addition, a lower mounting bracket 29 is attached to the oil guide member 14 at the lower end portion 17, and a lower mounting bracket 30 is attached to the upper end portion 19.

Next, the flow of oil scraped up by the final gear 5 will be described.
As shown in FIG. 2, at the high vehicle speed at which the final gear 10 is rotated at a high speed, the oil is strongly raked up by the high rotation of the final gear 5, and this oil is the oil of the vertical portion 26 of the oil gutter 22 and the oil guide member 14. It is led from the passages 15A to 15D to the horizontal portion 27 of the oil gutter 22 and supplied to each lubricated portion.

On the other hand, as shown in FIG. 3, at the low vehicle speed at which the final gear 10 is rotated at a low speed, the rotation of the final gear 5 is low, and the momentum of the oil scraped up by the final gear 5 is weak. The oil returns to the final gear 10 side by the vertical portion 26 of the oil gutter 22 due to gravity.
However, at this time, the oil that has flowed into the oil inlet portions 18A to 18D of the oil passages 15A to 15D gradually has an opening cross-sectional area of the oil passages 15A to 15D from the oil inlet portions 18A to 18D toward the oil outlet portions 20A to 20D. Since it is formed so as to be small, even if the flow is initially weak, it is possible to gradually increase the flow velocity by the opening cross-sectional area of the oil passages 15A to 15D and reach the oil outlet portions 20A to 20D, and The oil outlets 20A to 20D are discharged to the horizontal part 27 vigorously on the ceiling part 21 side in the transmission case 2 and supplied so as to blow to the lubricated part.

Although the embodiments of the present invention have been described above, the configuration of the above-described embodiments will be described for each claim.
First, in the invention according to claim 1, between the final gear 10 and the side wall 3 of the transmission case 2 positioned above the final gear 10, the oil scooped up by the final gear 10 is guided to the lubricated portion. An oil guide member 14 is disposed. The oil guide member 14 includes oil passages 15 </ b> A to 15 </ b> D formed from a cylindrical space, and has oil inlet portions 18 </ b> A to 18 </ b> D that open toward the oil surface F on the side where the final gear 10 scoops up oil at the lower end portion 17. At the same time, oil outlets 20 </ b> A to 20 </ b> D that open near the ceiling 21 of the transmission case 2 at the upper end 19 are provided. The oil passages 15A to 15D are formed so that the opening cross-sectional area gradually decreases from the oil inlet portions 18A to 18D toward the oil outlet portions 20A to 20D.
With such a structure, even when the final gear 10 is at a low vehicle speed at which the final gear 10 is rotated at a low speed, the oil scraped up by the rotation of the final gear 10 passes through the oil passages 15 </ b> A to 15 </ b> D of the oil guide member 14. It is carried to the ceiling portion 21 side of the case 2.
That is, the oil passages 15A to 15D of the oil guide member 14 are formed so that the opening cross-sectional area gradually decreases from the oil inlet portions 18A to 18D toward the oil outlet portions 20A to 20D. The oil that has flowed into the oil inlet portions 18A to 18D can gradually reach the oil outlet portions 20A to 20D by gradually increasing the flow velocity according to the new opening areas of the oil passages 15A to 15D. 2 to the ceiling 21 side.
Thereby, the oil supplied to the ceiling portion 21 side in the transmission case 2 is sprayed to the lubricated portion with the momentum discharged from the oil outlet portions 20A to 20D. As a result, even when the vehicle is running at a low vehicle speed at which the final gear 10 has a low rotation speed, the oil scraped up by the final gear 10 is supplied to the lubricated portion via the oil passages 15A to 15D of the oil guide member 14. And lubricate the lubricated part sufficiently.
Further, even when the oil level F is low, the oil can be lubricated, the initial set oil level can be lowered, the oil stirring resistance of the transmission 1 can be reduced, and the fuel consumption can be improved.
In the invention according to claim 2, the oil gutter 22 extending from the upper side of the final gear 10 to the upper side of the lubricated portion is attached to the ceiling portion 21 side of the transmission case 2. The oil gutter 22 includes a vertical portion 26 extending upward from the final gear 10 side, and a horizontal portion 27 extending from the upper end of the vertical portion 26 to the lubricated portion side in the horizontal direction. The oil guide member 14 extends to the height position of the horizontal portion 27 of the oil gutter 22. Oil outlet portions 20 </ b> A to 20 </ b> D of the oil guide member 14 are opened toward the horizontal portion 27 side of the oil gutter 22.
With such a structure, the oil discharged from the oil outlet portions 20A to 20D of the oil guide member 14 can be reliably guided to the horizontal portion 27 of the oil gutter 22 even at the low vehicle speed at which the final gear 10 is rotated at a low speed. .
Then, the oil discharged from the oil outlet portions 20A to 20D of the oil guide member 14 passes through the horizontal portion 27 of the oil gutter 22 to the upper portion of the lubricated portion and flows to the lubricated portion. As a result, even when the final gear 10 is running at a low vehicle speed, the oil can be supplied from the horizontal portion 27 to the motor 12 as another lubricated portion via the oil distribution pipes 28 and 28. The cooling performance of the motor 12 can be improved.

In the present invention, as a modification, for example, in order to obtain a larger amount of lubricating oil, when the oil passages having the tip throttle shape are arranged side by side, the outer shape of the oil guide member having the oil passage is aligned with the oil flow. By making it wavy, a rectifying effect can be obtained, and a reduction in oil stirring resistance can be expected.
Further, the present invention can be applied not only to the transmission but also to partial lubrication (lubrication of bearings and the like) of other devices such as a differential and a transfer.

  The transmission according to the present invention can be applied to various vehicles.

DESCRIPTION OF SYMBOLS 1 Transmission 2 Transmission case 3 Side wall of transmission case 4 One side joining part of transmission case 5 Other side joining part of transmission case 6 Input shaft 7 Planetary gear mechanism 8 Counter gear 9 Counter shaft 10 Final gear 11 Drive shaft DESCRIPTION OF SYMBOLS 12 Motor 13 Rear part of other side joint 14 Oil guide member 15A-15D Oil path 16A-16D Oil path pipe part 17 Lower end part of oil guide member 18A-18D Oil path inlet part 19 Upper end part of oil guide member 20A-20D Oil Passage outlet 21 Ceiling of other side joint 22 Oil gutter 26 Vertical part of oil gutter 27 Horizontal part of oil gutter

Claims (2)

  A drive shaft comprising an input shaft that is rotated by a drive source, a counter shaft that is provided with a counter gear to which the rotation of the input shaft is transmitted via a gear mechanism attached to the input shaft, and a final gear that is provided with the rotation of the counter shaft. In the transmission case, oil to be lubricated by the final gear is placed between the final gear and the side wall of the transmission case located above the final gear. The oil guide member is arranged to have an oil passage formed from a cylindrical space, and the oil is opened at the lower end toward the oil surface on the side where the final gear scoops up the oil. An oil inlet portion of the passage is provided, and the speed change is performed at the upper end portion. An oil outlet portion of the oil passage that opens near the ceiling of the case is provided, and the oil passage is formed so that an opening cross-sectional area gradually decreases from the oil inlet portion toward the oil outlet portion. Vehicle transmission.   An oil gutter extending from the upper side of the final gear to the upper side of the lubricated portion is attached to the ceiling portion side of the transmission case, and the oil gutter extends horizontally from the upper end of the vertical portion and the vertical portion extending from the final gear side. A horizontal portion extending toward the lubricated portion in the direction, extending the oil guide member to a height position of the horizontal portion of the oil gutter, and providing the oil outlet portion provided in the oil guide member to the oil gutter The vehicle transmission according to claim 1, wherein the transmission is open toward the horizontal portion.

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