JPS5832080Y2 - Vehicle drive system oil purification device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil purifying device for a vehicle drive system, such as a transmission differential.

Conventional lubrication methods for transmissions, differentials, etc. are oil-sealed types, and after a certain amount of driving, the oil itself deteriorates or becomes contaminated with metal powder, so it has to be replaced.

In addition, in the case of forced lubrication type, a filter paper type oil filter is installed separately to prevent metal powder etc. from getting mixed into the oil passing through the gear pump, etc., and this is also required for oil change. At the same time, it must be replaced regularly.

In addition, recently there are some passenger cars that do not require oil changes semi-permanently, but even in these cars, metal particles due to gear wear can float in the oil and cause contact between gears. There was a risk that the particles would enter the surface and accelerate gear wear.

The present invention eliminates the above-mentioned drawbacks of the conventional oil, has an extremely simple and compact structure, has a cleaning function for the oil stored in the case, and efficiently reduces noise in the drive system. The present invention provides a purification device.

The present invention will be described in detail below based on embodiments shown in the drawings.

In the first embodiment shown in FIG. 1, a case 1 forms the outer wall of the transmission, and an upper cover 2 is secured to the upper end flange portion 1a of the case 1 by tightening bolts 3. As shown in FIG.

A porous metal plate 4 formed in a substantially similar shape to the case 1 is fixed to the inner surface of the case 1 via a spacer 5,
A predetermined gap 6 is provided between the inner surface of the case 1 and the porous metal plate 1.
form.

Incidentally, instead of interposing the spacer 5, convex portions formed at several locations on the case 1 or the porous metal plate 4 may be brought into contact with and fixed to the other wall surface.

As a fixing method, a heat-resistant and oil-resistant resin adhesive may be used, or a fastener such as a bolt may be used.

As the porous metal plate 4, a hot-formed foamed metal of Ni or Fe type, or a sintered body having open cells, such as an aluminum sintered body, is suitable.

Further, the upper edge of the porous metal plate 4 is bent in a direction away from the case 1 to form an oil receiver portion 4a.

In the oil purification device for a vehicle drive device having such a configuration, some of the oil that is stirred by the gears of the transmission and scattered upward from the oil reservoir flows into the gap 6 either directly or along the inner wall surface of the upper cover 2. ,or,
The oil receiver formed on the upper edge of the porous metal plate 4 flows down to the opening of the gap 6 by the guiding action of the portion 4a, and further flows down the gap 6 and passes through the fine space of the porous metal plate 4. Return to the inside of the porous metal plate 4.

Therefore, foreign matter such as dirt or metal powder mixed in the oil that has flowed down or fallen into the gap 6 is filtered by the porous metal plate 4 and remains in the gap 6. Only clean oil can be returned inside the metal plate 4.

Furthermore, if the relative height between the oil level inside the porous metal plate 4 and the oil receiver (the height of the oil receiving portion 4a and the height of the gap 6) is appropriately selected, the filtration resistance by the porous metal plate 4 can be utilized. Since excess oil can be temporarily stored in the gap 6, there is no need to stir more oil than necessary during high-speed rotation of gears, etc., suppressing the increase in oil temperature, preventing oil deterioration, and improving lubrication performance. can be retained.

On the other hand, noise emitted from a sound source such as a gear is absorbed and relaxed to some extent by the oil inside the porous metal plate 4, as in the conventional case, and then reaches the porous metal plate 4.

Then, this porous metal plate 4 has a sound absorption effect similar to that of a conventional sound absorbing plate, so the noise is absorbed and alleviated to a large extent.Furthermore, since the noise is absorbed and alleviated by the oil in the gap 6, the case 1 The noise level reached is extremely low, and the transmitted sound from Case 1 is significantly reduced.

That is, the porous metal plate 4 has a large number of fine spaces, which need not be described in detail, and therefore has a noise reduction function comparable to that of conventionally known sound absorbing materials. Since the oil is infiltrated, the noise reduction function of the porous metal plate 4 is doubled due to the sound absorption and vibration damping function of this oil.

Further, if a thin plate 9 provided with an oil flow hole 8a and a guide piece 8b is provided on the inner surface of the porous metal plate 4 as in the second embodiment shown in FIG. 2, the oil passing through the porous metal plate 4 can be prevented. The oil flow can be improved by rectifying the flow with the guide piece 8b, and the sound insulation function, that is, the noise reduction function is improved.

Furthermore, in FIGS. 1 and 2, the drain plug 7 screwed onto the bottom of the case faces the gap 6, but as shown in FIG. 3, an oil drain hole 4b is provided in the bottom of the porous metal plate 4. ,
If the drain plug 7 is exposed to the oil inside the porous metal plate 4 through the oil drain hole 4b, the oil drain time can be shortened.

Note that the oil inside the case 1 becomes high temperature due to gear agitation, etc., so the components inside the case 1 are required to be heat resistant and oil resistant, but the porous metal plate 4, especially foamed metal and sintered metal, does not meet these requirements. It is well suited for

Further, FIG. 4 shows an application of the present invention to a differential device.

As explained above, according to the oil purification device according to the present invention, a porous metal plate formed in a substantially similar shape to the case forming the outer wall of the drive system is maintained at a predetermined gap on the inner surface of the case. When installed, the oil receiver is formed by bending the upper edge of the metal plate in the direction away from the case. The porous metal plate is formed with an oil circulation path that passes through and returns to the inside of the metal plate, and also has the function of cleaning the oil through the filtering action of the porous metal plate.

In addition, although it has an extremely simple configuration, it is possible to achieve a synergistic noise reduction effect between the porous metal plate and oil.
Noise transmitted through the case can be significantly reduced.

Furthermore, the porous metal plate has a structure with many minute spaces, so it is lightweight and has sufficient strength to reinforce the case, so the overall structure can be made more compact, and in particular, it is required to be smaller and lighter. Suitable for vehicle drive systems.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of essential parts showing a basic embodiment when the present invention is applied to a transmission, Fig. 2 is a longitudinal cross-sectional view of main parts showing a second embodiment, and Fig. 3 is a longitudinal cross-sectional view of main parts showing a basic embodiment when the present invention is applied to a transmission. FIG. 4 is a partial longitudinal cross-sectional view showing a modification of the oil draining mechanism in the embodiment, and FIG. 4 is a longitudinal cross-sectional view of the main part showing an embodiment in which the present invention is applied to a differential. 1... Case, 4... Porous metal plate,
4a...Oil receiver is in the area, 6...Gap.

Claims (4)

[Scope of utility model registration request] (1) A porous metal plate having a similar shape to the case that forms the outer wall of the vehicle drive system is attached to the inner surface of the case with a predetermined gap, and the upper edge of the porous metal plate is attached to the case. An oil purification device for a vehicle drive system, characterized in that an oil receiver is bent in a direction away from an inner surface of the vehicle. (2) The oil purifying device for a vehicle drive system according to claim 1, wherein the porous metal plate is made of foamed metal or sintered metal as a molding material. (3) Utility model registration claim 1 or 2, characterized in that a drain plug fixed to the bottom of the case is exposed to an oil reservoir inside the metal plate through an oil drain hole formed in the porous metal plate. The oil purification device for a vehicle drive system according to item 2. (4) The vehicle drive system according to any one of claims 1 to 3, characterized in that a thin plate provided with oil circulation holes is attached to the inner surface of the porous metal plate. oil purification device.