JPH0612293Y2 - Lubrication structure of transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lubrication structure of a transmission, which is capable of sufficiently lubricating a lubricated portion around a sub gear.

(Prior Art) As a conventional lubricating structure of this type, for example, there is one as shown in FIG.

In FIG. 2, 1 is a counter shaft, and the counter shaft 1 is rotatably supported by a case (not shown) via bearings 2 and 3. Reference numerals 4 and 5 denote a first counter gear and a first sub gear that mesh with a main drive gear (not shown), and reference numerals 6 and 7 denote a second counter gear and a second sub gear that mesh with a transmission gear (not shown). First
The counter gear 4 and the second counter gear 6 are formed integrally with the counter shaft 1. On the other hand, the first sub gear 5 and the second sub gear 7 are connected to the first counter gear 4 and the second sub gear 7 by the disc springs 10 and 11 interposed via the rings 8 and 9.
It is pressed against the counter gear 6 to generate friction.

First and second lubricating oil introducing chambers 12 and 13 for introducing lubricating oil are formed between the first counter gear 4 and the first sub gear 5 and between the second counter gear 6 and the second sub gear 7, respectively. Lubricating oil is introduced into the first and second lubricating oil introducing chambers 12 and 13 from the hollow portion 16 formed in the counter shaft 1 through the first and second oil passages 14 and 15.

Therefore, the inner diameter and the thrust surface of the first and second sub gears 5 and 7 are lubricated by the lubricating oil introduced into the first and second lubricating oil introducing chambers 12 and 13.

(Problems to be solved by the invention) However, in such a conventional lubricating structure,
Since the hollow portion of the counter shaft has a uniform inner diameter, centrifugal force does not sufficiently act, and the lubricating oil flows in the direction indicated by arrow A in FIG. 2 to introduce the first and second lubricating oils. It was not possible to supply sufficient lubricating oil to the chamber.

As a result, there is a problem in that wear and fretting corrosion occur in the first and second sub gears, and eventually seizure and friction occur.

(Means for Solving Problems) The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a lubrication structure that prevents friction and seizure of a sub gear. I'm going.

In order to achieve this object, the present invention comprises a counter shaft having a plurality of counter gears and a plurality of sub gears that can rotate relative to the counter gears. In a lubrication structure of a transmission in which a lubricating oil introduction chamber for introducing lubricating oil through an oil passage is formed between the counter gear and the sub gear, the counter shaft is split forged between the counter gears, and at the time of this forging An oil sump chamber communicating with the oil passage is formed in the hollow portion.

(Operation) In the present invention, the lubricating oil is stored in the large-capacity oil reservoir formed by extending from the hollow portion of the counter shaft to the outside of the hollow portion, and the stored lubricating oil is centrifuged by the rotation of the counter shaft. Since the force is used to introduce the oil into the lubricating oil introducing chamber through the oil passage, sufficient lubricating oil can be supplied to the lubricated portion of the sub gear.

As a result, it is possible to prevent wear of the sub gear and the occurrence of fretting corrosion, and it is possible to prevent seizure and friction.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

The same components as those of the conventional example will be described with the same reference numerals.

First, the structure will be described. In FIG. 1, 1 is a counter shaft, and this counter shaft 1 is a bearing 2.
It is rotatably supported by a case (not shown) via the shaft 3.
The counter shaft 1 is integrally formed with a first counter gear 4 that meshes with a main drive gear (not shown) and a second counter gear 6 that meshes with a transmission gear (not shown), and on the first counter gear 4 side. A first sub gear 5 that meshes with the drive gear and a second sub gear 7 that meshes with the transmission gear are attached to the second counter gear 6 side so as to be rotatable relative to the first and second counter gears 4, 6.

Between the bearing 2 and the first counter gear 4 and between the bearing 3 and the second
Disc springs 10 and 11 are respectively interposed between the counter gear 6 and rings 8 and 9, and the disc springs 10 and 11 serve to connect the first and second sub gears 5 and 7 to the first and second sub-gears.
The second counter gears 4 and 6 are pressed against each other to generate friction.

Further, first and second lubricating oil introducing chambers 12, 13 for introducing lubricating oil are formed between the first counter gear 4 and the first sub gear 5 and between the second counter gear 6 and the second sub gear 7. The first and second lubricating oil introducing chambers 12 and 13 are
The first and second oil passages 14 and 15 respectively formed in the counter shaft 1 communicate with each other.

Here, the counter shaft 1 is divided into the first counter gear 4 side and the second counter gear 6 side, and each is forged. At the time of this forging, an oil sump chamber 17 for storing lubricating oil is formed in the hollow portion 16 formed in the counter shaft 1.

In this case, in FIG. 1, the difference between the inner diameter φD and the inner diameter φd (φD
Since there is no restriction on processing, -φd) can be freely set, and therefore the volume of the oil sump chamber 17 can be increased at a relatively low cost.

After that, the counter shaft 1 which is split and forged at the position shown by the arrow B is friction welded. The oil sump chamber 17 communicates with the inside of the first and second lubricating oil introduction chambers 12 and 13 via the first and second oil passages 14 and 15, respectively.

Next, the operation will be described.

The lubricating oil is first introduced into the hollow portion 16 formed in the counter shaft 1, as indicated by arrows C and D in FIG.
The lubricating oil introduced into the hollow portion 16 is stored in the oil sump chamber 17.

Here, since the oil reservoir 17 has a large volume,
A sufficient amount of lubricating oil is stored in the oil sump chamber 17.

Then, by the centrifugal force generated by the rotation of the counter shaft 1, the lubricating oil in the oil sump chamber 17 becomes
The first and second lubricating oil introduction chambers 1 pass through the second oil passages 14 and 15.
Introduced in 2 and 13.

The lubricating oil introduced into the first and second lubricating oil introducing chambers 12 and 13 is sufficiently supplied to the inner diameters and the thrust surfaces of the first and second sub gears 5 and 7, and the first and second sub gears 5 and 7 are supplied. Forcibly lubricate each inner diameter and each thrust surface.

As a result, it is possible to prevent excessive friction from occurring in the first and second sub gears 5 and 7 without causing wear or fretting corrosion, and to prevent seizure.

(Effect of the Invention) As described above, according to the present invention, it is possible to supply sufficient lubricating oil to the lubricated portion around the sub gear, so that it is possible to prevent seizure and excessive friction from occurring at low cost. You can

[Brief description of drawings]

 FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional example. 1 ... Counter shaft, 2,3 ... Bearing, 4,6 ... First and second counter gears, 5,7 ... First and second sub gears, 8,9 ... Ring, 10,11 ... Disc springs, 12,13 ... first and second lubricating oil introduction chambers, 14, 15 ... first and second oil passages, 16 ... hollow portion, 17 ... oil sump chamber.

Claims (1)

[Scope of utility model registration request] 1. Lubricating oil having a plurality of counter gears and a plurality of sub gears that can rotate relative to the counter gears, and a hollow portion of a counter shaft integrally formed with the counter gears through an oil passage. In a lubrication structure of a transmission in which a lubricating oil introducing chamber for introducing the oil is formed between the counter gear and the sub gear, the counter shaft is forged separately between the counter gears, and the oil passage is formed in the hollow portion during the forging. A lubricating structure for a transmission, characterized in that an oil sump communicating with the oil reservoir is formed.