JPH09144856A - Lubricating mechanism for manual transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricating mechanism, capable of supplying a sufficient lube oil to a place requiring lubrication and having compact constitution, in a manual transmission. SOLUTION: In a manual transmission, comprised of providing the fitting part for a bearing, for rotatively supporting a counter shaft 24 at the shaft end of it, on a standing wall 12a provided on the junction part of an extension housing 12 into which an output shaft 22 is penetrated and a mission case 11; an oil reservoir R, for accumulating a lubricating oil, is coaxially provided on the extension housing side of the fitting part; and also a communicating hole H, for communicating the insides of the extension housing 12 and the mission case 11, is provided on the upper part of the standing wall 12a. Also, a shell-form bearing 23, having a press-worked external ring 23a, is adopted as the bearing, and a plate 23b, having an orifice O, is integrally provided on the extension housing side of the external ring 23a in this bearing 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with a bearing mounting portion for rotatably supporting a counter shaft at its shaft end on a standing wall provided at a joint portion between an extension housing through which an output shaft penetrates and a transmission case. The present invention relates to a lubrication mechanism for use in a manual transmission.

[0002]

2. Description of the Related Art In the above-mentioned manual transmission, it is necessary to supply lubricating oil not only to the bearing but also to the lubrication necessary portion in the extension housing, and to receive the lubricating oil splashed up by the gear in the transmission case. A lubrication mechanism is configured to supply lubricating oil to a lubrication necessary portion in the extension housing using a gutter and guide the lubricating oil after lubricating the lubrication required portion to the bearing, for example, Japanese Patent Publication No. 62-4580. 62-165
No. 34 publication.

[0003]

In the lubrication mechanism of each of the above publications, it is necessary to secure a space for arranging the gutter in the extension housing, and it is necessary to increase the size of the extension housing. In addition, all the lubricating oil that lubricates the lubrication required part is guided to the bearing, and all the lubricating oil that lubricates the bearing is guided to the mission case. If it is not sufficient, lubrication may not be performed sufficiently.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a counter shaft is provided on a standing wall provided at a joint between an extension housing through which an output shaft penetrates and a mission case. In a manual transmission having a bearing mounting portion that is rotatably supported by the extension housing, an oil reservoir for storing lubricating oil is coaxially provided on the extension housing side of the mounting portion, and the extension housing is provided on an upper portion of the standing wall. A shell-shaped bearing having a communication hole for communicating the inside with the inside of the mission case and having a pressed outer ring as the bearing is adopted, and a plate having an orifice is integrally formed on the extension housing side of the outer ring of this bearing. The feature is that it is provided.

[0005]

In the lubricating mechanism for the manual transmission according to the present invention, when the output shaft and the counter shaft rotate, the gears provided on the shafts cause the lubricating oil contained in the transmission case to jump up. The part enters the extension housing through the communication hole provided in the standing wall and flows down to the oil sump. By the way, since the flow of the lubricating oil to the bearing is restricted by the plate having the orifice in the oil reservoir, not only the oil reservoir but also a predetermined level in the extension housing (the amount of the lubricating oil flowing through the communication hole and the diameter of the orifice). Lubricating oil is stored until Therefore, the lubrication-needed portion located in the lubricating oil flow path and the lubrication-needed portion in the extension housing arranged up to the lubricating oil level are appropriately lubricated with a sufficient amount of the lubricating oil. Further, in the oil sump, foreign matter in the lubricating oil can be separated and settled, so that the foreign matter can be prevented from entering the bearing and the life of the bearing can be improved.

Further, according to the present invention, a communication hole is provided in the standing wall, an oil reservoir is coaxially provided at an end portion of the counter shaft on the extension housing side, and a shell type supporting the end portion of the counter shaft on the extension housing side is supported. Since it can be implemented by integrally providing a plate having an orifice on the extension housing side of the pressed outer ring of the bearing, it can be implemented compactly and inexpensively.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a part of a manual transmission in which a lubrication mechanism according to the present invention is implemented. In this manual transmission, an extension housing 12 is liquid-tightly attached to an end of a transmission case 11. A shield type ball bearing 2 which rotatably supports an output shaft 22 at an intermediate portion thereof on a standing wall 12a provided integrally with the extension housing 12.
1 is attached, and a shell type needle bearing 23 that rotatably supports the counter shaft 24 at its shaft end is attached.

The output shaft 22 is provided so as to pass through the extension housing 12, and a gear 25, which is always meshed with a gear 24a provided on the counter shaft 24, is rotatably assembled to a portion inside the transmission case 11 at a position inside the transmission case 11. Further, a speedometer drive gear 26 is integrally rotatably attached to a portion inside the extension housing 12. Further, a sleeve yoke 27 shown by an imaginary line is assembled to the end of the output shaft 22 so that torque can be transmitted. A bush 13 and an oil seal 14 are assembled between the sleeve yoke 27 and the extension housing 12. Has been. The speedometer drive gear 26 is always meshed with the speedometer driven gear 28 assembled to the extension housing 12, and the speedometer driven gear 28 is adapted to rotate clockwise in the drawing when the output shaft 22 rotates forward. .

By the way, in this embodiment, an oil reservoir R for accumulating lubricating oil is coaxially provided on the extension housing side of the needle bearing 23, and the standing wall 1 is provided.
A communication hole H for communicating the inside of the extension housing 12 and the inside of the mission case 11 is provided in the upper portion of 2a. The communication hole H is provided in the upper chamber A that houses the shift head 31.
Through the communication hole B provided at the bottom of the upper chamber A, the intermediate chamber C accommodating the output shaft 22 and the gears 26 and 28 of the speedometer, and the communication hole D provided at the bottom of the intermediate chamber C. It communicates with the upper part of the reservoir R. Further, a plate 23b having an orifice O at a substantially central portion is integrally provided on the extension housing side of the pressed outer ring 23a of the needle bearing 23 (which is non-rotatably fitted to the attachment portion of the extension housing 12). . Note that an oil receiver (not shown) may be provided on the transmission case 11 side of the communication hole H provided in the upper portion of the standing wall 12a to positively guide the lubricating oil into the extension housing 12. is there.

In the present embodiment constructed as described above, the lubrication mechanism is composed of the plate 23b having the above-mentioned orifice O, the oil reservoir R, the communication hole H, and the like.
In this lubrication mechanism, when the output shaft 22 and the counter shaft 24 rotate, each shaft 2
The lubricating oil stored in advance in the transmission case 11 is splashed up by the gears provided in the transmission housings 2 and 24, for example, the gears 24a and 25, and a part of the lubricating oil passes through the communication hole H provided in the standing wall 12a as shown by the arrow in the drawing.
It flows into the oil reservoir R through the upper chamber A, the communication hole B, the intermediate chamber C, and the communication hole D.

By the way, in the oil sump R, the flow of the lubricating oil to the needle bearing 23 is restricted by the plate 23b having the orifice O. Therefore, not only the oil sump R but also a predetermined level in the extension housing 12 (this level is Amount of lubricating oil flowing through the communication hole H and the orifice O
The lubricating oil is stored up to a level slightly higher than the lower end positions of the bush 13 and the oil seal 14). Therefore, the lubrication-required points (the lubrication-required points of the shift head 31 and the gears 26 of the speedometer, which are located in the above-mentioned lubricating oil passages A, B, C, D).
28) and the required lubrication points (the required lubrication points of the bush 13 and the oil seal 14) in the extension housing 12 arranged at the positions up to the level of the lubricating oil are of the sufficient amount shown by the arrows in the figure. Accurate with the lubricating oil (the arrows shown from the gears 26 and 28 of the speedometer toward the bush 13 and the oil seal 14 indicate the flow of the lubricating oil when the level of the lubricating oil rises to the corresponding position). To be lubricated. Further, in the oil reservoir R, foreign matter in the lubricating oil can be separated and precipitated, so that the foreign matter can be prevented from entering the needle bearing 23 and the life of the needle bearing 23 can be improved. In addition,
When the rotation of the output shaft 22 and the counter shaft 24 is stopped, the lubricating oil in the extension housing 12 flows down to the oil reservoir R and returns to the inside of the mission case 11 through the orifice O and the needle bearing 23.

Further, in the lubrication mechanism of this embodiment,
A communication hole H is provided in the standing wall 12a, an oil reservoir R is coaxially provided at an end portion of the counter shaft 24 on the extension housing side, and a shell type needle bearing 23 for supporting the end portion of the counter shaft 24 on the extension housing side is provided. A plate 23 having an orifice O on the extension housing side of the pressed outer ring 23a
Since it can be implemented by integrally providing b, it can be implemented compactly and inexpensively.

In the above embodiment, the present invention is applied to the manual transmission in which the extension housing 12 is integrally provided with the standing wall 12a. However, the present invention is a manual transmission or mission in which the standing wall is integrally provided on the mission case side. The same can be applied to the manual transmission in which the standing wall forming member is interposed between the case and the extension housing.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an essential part showing a part of a manual transmission including a lubrication mechanism according to the present invention.

[Explanation of symbols]

11 ... Mission case, 12 ... Extension housing, 12a ... Standing wall, 13 ... Bushing, 14 ... Oil seal, 21 ... Shield type ball bearing, 22 ... Output shaft, 23 ... Shell type needle bearing, 23
a ... Outer ring, 23b ... Plate, 24 ... Counter shaft, 24a ... Gear, 25 ... Gear, H ... Communication hole, R ... Oil sump.

Claims (1)

[Claims] 1. A manual transmission in which a bearing mounting portion for rotatably supporting a counter shaft at its shaft end is provided on a standing wall provided at a joint portion between an extension housing through which an output shaft penetrates and a transmission case. An oil reservoir for storing lubricating oil is provided coaxially on the side of the extension housing of the mounting portion, and a communication hole for communicating the inside of the extension housing with the inside of the transmission case is provided on the upper portion of the standing wall, and the bearing is pressed. A lubrication mechanism for a manual transmission, characterized in that a shell type bearing having an outer ring is adopted, and a plate having an orifice is integrally provided on the extension ring side of the outer ring of the bearing.