JP2003269586A - Lubricating structure for transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating structure for a manual transmission for a vehicle with a simple structure, in particular capable of reducing the agitation loss at high-speed revolutions of the transmission. <P>SOLUTION: The lubricating structure has a manual transmission 10 with parallel gear trains, a transmission case 2, an oil separator 1 extended adjacently to a plurality of gears 5, 6,..., 9 and the shaft 4 of the transmission to surround the outer periphery thereof in which the upper end 1a is formed higher than the lubricating oil level in the case 2 during halts of the transmission, an oil tank 3 separated by the separator 1 and formed in a space between the outside of the separator 1 and the inside of the case 2, and a sealing means 14 (see figure 2) sealing at least one side of the tank 3 along the shaft direction of the transmission against the space inside of the separator 1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating structure for a transmission, and more particularly to a lubricating structure for a vehicle manual transmission and a vehicle manual transmission having the lubricating structure.

[0002]

2. Description of the Related Art FIG. 6A is a longitudinal sectional view for explaining a lubricating structure of a manual transmission as an example of a transmission according to a first conventional example, and FIG. It is a principal part expanded transverse cross section of (A).

Referring to FIGS. 6A and 6B,
The transmission 60 is housed in the transmission case 62. The transmission 60 includes shafts 60 that are parallel to each other.
a, 60b and a shaft 60 arranged in parallel with each other
a, a plurality of gears (64,
67), (65, 68), and the gear 65 to the shaft 60.
It has a synchronizing device 66 or the like for selectively fixing to b, transmitting power from the gear 65 to the gear 64, and performing a predetermined gear shift. The transmission 60 is a transmission that shifts gears using parallel gear trains (64, 67) and (65, 68) composed of a plurality of gears, and at least the gears 64 are lubricated by the lifted lubricating oil. . An oil separator 61 is formed in the transmission case 62 so as to extend along the axial direction of the transmission 60 or its shaft. Between the outer side of the oil separator 61 and the inner side of the transmission case 62, there is a space 63 partitioned by the oil separator 61 and extending along the axial direction of the transmission 60. In this space 63, both sides along the axial direction of the transmission 60 are open. Therefore, the lubricating oil stored in this space freely flows back into the space inside the oil separator 61 from both sides of the space and is lifted up by the gear 64 and the like.

In particular, referring to FIG. 6 (B), the oil separator 61 is lower than the oil level of the lubricating oil stored in the transmission case 62 when the transmission is stopped and surrounds the outer peripheral portion of the gear 64. It has the formed wall part 61a.

FIG. 7 is a vertical sectional view for explaining a lubricating structure of a manual transmission according to a second conventional example.

Referring to FIG. 7, an oil pan 71 is installed below the transmission 70. An oil chamber 72 is installed above the transmission 70. The oil chamber 72 is located above the oil level of the lubricating oil stored in the lower portion in the transmission case (not shown) that houses the transmission 70. In the oil chamber 72,
Lubricating oil is supplied from a vehicle speed-sensitive oil pump 74. The lubricating oil stored in the oil chamber 72 is dropped on the transmission 70 and then stored in the oil pan 71. The gears of the transmission 70 scoop up the lubricating oil stored in the oil pan 71, and the transmission 70 is scrubbed by the scraped lubricating oil.
The gears, etc. are lubricated.

[0007]

However, as shown in FIG.
Referring to FIGS. 6A and 6B, the lubrication structure for the manual transmission according to the first conventional example has the following problems.

The problem is that the lifted lubricating oil is
Since there is a large amount of clearance around the oil separator 61, for example, from both sides of the space 63 along the axial direction of the transmission 60 or over the wall portion 61a and returning to the space inside the oil separator 61, the gear 64 or the like is scraped up. Oil quantity, i.e.
This means that the amount of stirring oil cannot be reduced sufficiently.

In particular, when the vehicle speed is high, the rotation speed of the gear 64 and the like is high, and therefore the amount of lubricating oil stored inside the oil separator 61 may be small, but the first conventional example is used. In the lubrication structure of the manual transmission according to the above, since the amount of the lubricating oil returning to the space inside the oil separator 61 is large regardless of the vehicle speed, extra resistance is generated during high speed traveling.

Referring to FIG. 7, the lubrication structure for the manual transmission according to the second conventional example has the following problems.

The first problem is that the oil chamber 72 is
Since the transmission 70 is located above the oil level of the lubricating oil stored in the lower portion of the transmission case (not shown), the arrangement of other components accommodated in the transmission case is restricted. is there.

The second problem is that the manufacturing cost and the mounting cost of the oil chamber 72 occur.

An object of the present invention is to provide a lubrication structure for a transmission, which has a simple structure and, in particular, can reduce agitation loss during high speed rotation of the transmission.

[0014]

According to a first aspect of the present invention, a plurality of gears and shafts provided in a transmission are surrounded by the gears and shafts so as to surround the outer circumferences of the gears and shafts, and the upper ends thereof are provided. An oil separator formed to be higher than an oil surface of the lubricating oil stored in a transmission case accommodating the transmission when the transmission is stopped, the oil separator outside and the transmission separated by the oil separator An oil tank formed in a space between the inside of the case and at least one side of the oil tank along the axial direction of the transmission so that the lubricating oil does not flow from the inside of the oil tank to the inside of the oil separator. And a sealing means for sealing the space inside the oil separator. To provide. The present invention provides a lubricating structure for a transmission according to the second aspect based on the first aspect, wherein an upper portion of a space inside the oil separator and an upper portion of the oil tank are opened.

The effects of the lubricating structure for the transmission according to the present invention will be described.

The lubricating oil scraped up by the gears and the like of the transmission lubricates the various parts of the transmission and then enters the inside of the oil separator or the oil tank. The amount of lubricating oil that returns to the inside of the oil separator and the amount of lubricating oil that enters the oil tank change depending on the transmission rotation speed (vehicle speed).

Specifically, since the upper end of the oil separator is set higher than the height of the oil surface when the transmission is stopped (when the vehicle is stationary), the amount of lubricating oil accumulated inside the oil separator and the oil tank The ratio of the amount of lubricating oil accumulated inside to the oil amount is sensitive to the transmission rotation speed (vehicle speed). That is, when the transmission rotation speed (vehicle speed) is low,
The amount of the lubricating oil accumulated inside the oil separator increases, and the lubricating oil is sufficiently pumped up even if the rotation of the gear is low. On the other hand, when the transmission rotation speed (vehicle speed) is high, the stirring force for scraping up the lubricating oil is large, so the amount of oil that enters the oil tank located outside increases and the amount of lubricating oil that accumulates inside the oil separator increases. The amount of oil is reduced, and the amount of stirring oil such as gears provided in the transmission is reduced. In summary, according to the present invention, both reduction of the amount of stirring oil at high speed (improvement of power transmission efficiency) and securing of lubrication at low speed can be achieved at the same time.

The sealing means limits the amount of lubricating oil that flows back from the inside of the oil tank to the inside of the oil separator. Particularly, when the transmission rotation speed (vehicle speed) is high, the amount of oil entering the inside of the oil separator is limited. The amount of agitating oil such as gears included in the transmission is reduced.

With the oil separator, a space (oil tank) for storing lubricating oil can be formed between the outside of the oil separator and the inside of the transmission case. Therefore, an increase in the number of parts and an increase in cost due to the provision of the oil separator and the oil tank can be suppressed, and the operational effects of the present invention can be achieved with a simple structure.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below.

A lubrication structure for a transmission according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 and 2, in which parallel gear trains (one gear train is composed of gears 5, 6, ..., 9). ,
The other gear train performs gear shifting (not shown), and at least the gearbox 10 applied to the gearbox in which the gear is lubricated by the lifted lubricating oil, the transmission case 2 that houses the gearbox, and the plurality of gears. Of the gear and the shaft, the upper end 1a of which extends close to the plurality of gears and the shaft so as to surround the outer periphery of the gear and the shaft of the lubricating oil stored in the transmission case when the transmission is stopped. An oil separator 1 that is also formed high
An oil tank 3 formed in the space between the outside of the oil separator and the inside of the transmission case, which is partitioned by the oil separator, and the lubricating oil so that the lubricating oil does not flow from the inside of the oil tank to the space inside the oil separator. Sealing means 14 (see FIG. 2) for sealing at least one side of the oil tank along the axial direction of the transmission with respect to the space inside the oil separator;
Have. Further, the space inside the oil separator 1 and the upper part of the oil tank 3 partitioned by the oil separator 1 are opened, and the lubricating oil enters the space inside the oil separator and the inside of the oil tank through the opening.

A lubricating structure for a transmission according to a preferred embodiment of the present invention, referring to FIG. 2, is a lubricating structure formed in the oil separator 1 and connecting a space inside the oil separator and the oil tank 3 to each other. It has a hole 13. The lubrication holes further ensure the lubrication of the transmission.

A lubricating structure for a transmission according to a preferred embodiment of the present invention has a return hole 11 for discharging the lubricating oil in the oil tank 3 with reference to FIG. This return hole ensures reduction of residual oil when replacing the lubricating oil.

The lubricating structure for a transmission provided by the present invention is preferably applied to a manual transmission mounted on a vehicle.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the preferred embodiment of the present invention described above, referring to the drawings, the lubrication structure for a transmission according to the present invention is applied to a manual transmission mounted on a vehicle. An embodiment (a manual transmission for a vehicle) of the present invention will be described.

FIG. 1 is a transverse sectional view for explaining a lubricating structure for a transmission according to an embodiment of the present invention. FIG. 2 is a vertical cross-sectional view for explaining a lubrication structure for a transmission according to an embodiment of the present invention. FIG. 3 is a sectional view taken along line BB of FIG. FIG. 4 is a sectional view taken along line CC of FIG. 5 is shown in FIG.
FIG.

Referring to FIG. 1, a lubrication structure for a transmission according to an embodiment of the present invention includes a transmission 10, a transmission case 2 that houses the transmission 10, and a plurality of gears 5 included in the transmission 10. , 6, ..., 9 and a plurality of gears 5, 6, ..., 9 and the shaft 4 so as to surround the outer circumference of the shaft 4, and extends in a wall shape, and its upper end portion 1a (see FIGS. 3 to 5)
Is formed above the oil surface of the lubricating oil stored in the transmission case 2 when the transmission 10 is stopped, and the oil separator 1 outside and the transmission case 2 which are partitioned by the oil separator 1. It is formed in the space between the inside and the transmission 1
Oil tank 3 extending along the axial direction of 0, and at least one side of the oil tank 3 along the axial direction of the transmission 10 so that the lubricating oil does not flow from the inside of the oil tank 3 to the space inside the oil separator 1. The rear side) is the oil separator 1
The sealing means 14 which seals with respect to an inner space.

The space inside the oil separator 1 partitioned by the oil separator 1 and the upper part of the oil tank are opened, and the lubricating oil enters the space inside the oil separator 1 and the oil tank 3 through the opening.

Like the transmission 60 shown in FIG. 6 (A), the transmission 10 has shafts 4 parallel to each other (the other shaft is not shown) and a plurality of gears 5 mounted on the shaft 4. , 9, and the like, and gears mounted on the other shaft (not shown) and meshing with the plurality of gears 5, 6, ..., 9 respectively, and the gear 5 is selectively fixed to the shaft 4, It has a synchronizing device 15 and the like for transmitting power from a gear to an unillustrated gear that meshes with the gear 5 and performing a predetermined gear shift. The transmission 10 includes a parallel gear train (5, 6, ..., 9) composed of a plurality of gears, and a gear train (not shown) meshing with the parallel gear train (5, 6, ..., 9), respectively. Is a transmission in which the gear train is used for gear shifting, and the gears 5 and the like are lubricated by the lifted lubricating oil.

In this embodiment, the sealing means 14 is made of a rubber member, and seals between the rear wall of the transmission case 2 and the rear end of the oil separator 1 so that the shaft of the transmission 10 of the oil tank 3 can be prevented. At least one side (rear side) along the direction is sealed with respect to the space inside the oil separator 1. The sealing means 14 is not limited to a rubber member, and may be made of another member, or the rear end of the oil separator and the rear wall of the transmission case may be integrated.

The front end of the oil separator 1 is supported by the transmission case 2, and the two are integrated.

On the shaft 4 of the transmission 10, the gears 5,
6, ..., 9 are attached. In particular, with reference to FIG.
The oil separator 1 extends in the axial direction of the shaft 4 so as to be close to the gears 5, 6, ..., 9 and the shaft 4.

Referring particularly to FIGS. 3 to 5, the oil separator 1 is formed so as to surround the outer peripheral portions of the gears 5, 6, ..., 9 and contains the lubricating oil stored in the transmission case 2. It is provided with an upper end portion (upper wall) 1a projecting above the oil level when the transmission 10 is stopped.

2 or 5, the oil separator 1 is provided with a lubrication hole 13 which connects the space inside the oil separator 1 and the oil tank 3.

Referring to FIGS. 2 and 4, the oil tank 3
A return hole 11 for discharging the lubricating oil in the oil tank 3 is formed at the bottom of the.

The operation of the lubricating structure for the transmission according to the embodiment of the present invention described above will be described.

Referring to FIGS. 1-5, gears 5, 6,
.., 9 and the shaft 4 scrape up the lubricating oil accumulated inside the oil separator 1 (on the side of the transmission 10) in the transmission case 2 when the transmission 10 is operating (when the vehicle is running). 10 Lubricate each part.

When the rotation speed (vehicle speed) of the transmission 10 is low, the amount of lubricating oil accumulated inside the oil separator 1 is large, and the transmission 10 is sufficiently lubricated. On the other hand, when the rotation speed (vehicle speed) of the transmission 10 is high, the stirring force for scraping up the lubricating oil is large, so that the amount of oil that enters the oil tank 3 located outside increases, and The amount of accumulated lubricating oil is reduced, and the amount of agitating oil such as gears provided in the transmission is reduced. Further, the sealing means 14 limits the amount of lubricating oil that flows back from the oil tank 3 to the inside of the oil separator 1, and particularly, the transmission 1
When the number of revolutions (vehicle speed) of 0 is high, the oil separator 1
The amount of oil entering the inside is reduced, and the amount of stirring oil is reduced.

As described above, according to the lubrication structure of the transmission according to the embodiment of the present invention, the simple structure reduces the amount of agitating oil at high speed (improves power transmission efficiency) and secures lubrication at low speed. The compatibility of both is achieved.

[0040]

According to the present invention, there is provided a lubricating structure for a manual transmission which has a simple structure and, in particular, can reduce agitation loss during high speed rotation of the transmission.

[Brief description of drawings]

FIG. 1 is a transverse cross-sectional view (central axis cross-sectional view) for explaining a lubrication structure for a transmission according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view (cross-sectional view of the central axis) for explaining the lubrication structure of the transmission according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a sectional view taken along line CC of FIG.

5 is a cross-sectional view taken along line DD of FIG.

FIG. 6A is a vertical cross-sectional view for explaining the lubrication structure of the manual transmission according to the first conventional example, and FIG. 6B is an enlarged horizontal cross-sectional view of a main part of FIG.

FIG. 7 is a vertical sectional view for explaining a lubricating structure of a manual transmission according to a second conventional example.

[Explanation of symbols]

1 Oil separator (wall) 1a Upper end (upper wall) 2 transmission case 3 oil tank 4 shafts 5,6,7,8,9 gears 10 transmission 11 Return hole 13 Lubrication hole 14 Sealing means 15 Synchronizer

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Claims (5)

[Claims] 1. Lubrication in which a plurality of gears respectively mounted on shafts arranged in parallel to each other are provided, a gear shift is performed using a parallel gear train composed of the plurality of gears, and at least the gears are lifted up. In a transmission that is lubricated with oil, a transmission case that accommodates the transmission, a plurality of gears and the shaft that extend in the vicinity of the shaft so as to surround the outer circumferences of the gear and the shaft, and an upper end portion thereof extends An oil separator formed to be higher than an oil level of the lubricating oil stored in the transmission case when the transmission is stopped, and between the oil separator outer side and the transmission case inner side partitioned by the oil separator. An oil tank formed in the space, and a space from the inside of the oil tank to the inside of the oil separator A sealing means for sealing at least one side of the oil tank along the axial direction of the transmission with respect to a space inside the oil separator so that lubricating oil does not flow into the transmission. Lubrication structure. 2. The lubricating structure for a transmission according to claim 1, wherein a space inside the oil separator partitioned by the oil separator and an upper portion of the oil tank are opened. 3. The lubricating structure for a transmission according to claim 1, further comprising a lubricating hole formed in the oil separator, the lubricating hole communicating the space inside the oil separator with the oil tank. 4. A lubrication structure for a transmission according to claim 1, further comprising a return hole for discharging the lubricating oil in the oil tank. 5. A manual transmission for a vehicle, comprising the lubrication structure for the transmission according to claim 1.