JPH0514033Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a lubricating pressure generating structure for a gear device.

(Prior Art) A gear device is configured to transmit power through gears incorporated in a housing, and at this time, various parts are lubricated by lubricating oil contained in the housing.

However, if the lever is lubricated only with the scraped oil from the gear, there will be some locations where the lubrication will be insufficient. Therefore, a forced lubrication method is often adopted in which lubricating pressure is generated and the lubricating oil inside the housing is pumped to each part.

By the way, regarding the generation of lubricating pressure in the past, for example, the ``Toyota Celica GT-Four new car manual (E-
As shown on page 3-29 of ``ST165)'', it was common practice to install an oil pump separately in the housing and drive it with a built-in gear to suck in and discharge lubricating oil through an oil tray. .

(Problem that the invention aims to solve) However, in such a conventional lubricating pressure generation structure, a large and expensive oil pump is added, which increases the cost and size of the gear device, and in addition, the oil pump drive energy is increased. It is inevitable that power loss will occur accordingly.

(Means for solving the problem) In view of this problem, the present invention provides a built-in gear with a pumping function. The mold cover is fixed to the housing, the wall surface of the tooth mold cover facing the tooth tip trajectory surface approaches the tooth tip trajectory surface as it goes in the gear rotation direction, and a lubricating pressure generating depression is formed in the wall surface. It will be done.

(Operation) While the gear device transmits a predetermined power through the gears in the housing, the gears drag the lubricating oil in the housing. The lubricating oil that is being dragged flows into the toothed cover and further moves in the gear rotation direction while being guided by this toothed cover.

However, since the wall surface of the tooth cover that faces the tooth tip trajectory surface approaches the tooth tip trajectory surface as it moves toward the gear rotation direction, the lubricating oil that moves in the gear rotation direction while being guided by the tooth profile cover is As the volume decreases, lubrication pressure is generated in the lubrication pressure generation depression in the wall surface.

As a result, the lubricating oil is forced into each part from within the above-mentioned recess, and these parts can be forcibly lubricated.

By the way, since a built-in gear is used to generate lubrication pressure without adding a separate pump, the lubrication pressure generation structure does not make the gear device expensive or large, and it does not cause power loss. do not have.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

1 and 2 show an embodiment of the present invention, and in the figures, 1 indicates a housing, in which the following gear device is housed. This gear device is a final drive gear set that drives the differential gear 2 of a front wheel drive vehicle, and the final drive pinion 3.
and a final drive ring gear 4 that meshes with this.

The drive pinion 3 is driven by the transmission output shaft 5, and the ring gear 4 is connected to a differential gear case 8 supported in the housing 1 by thrust bearings 6, 7, so that rotation from the drive pinion 3 is driven by the differential gear case 8. It is assumed that the input is to the serial gear. The differential gear 2 can distribute and output this rotation to the left and right front wheels to drive the vehicle.

In the present invention, the following lubricating pressure generating structure 10 is set for such a gear device. That is, the second
A tooth profile cover 11 that completely surrounds a partial tooth profile 4a of the ring gear 4 at a level below the lubricating oil level indicated by L in the figure is integrally molded within the housing 1, and is connected to the side cover wall surfaces 11a, 11b and the outer peripheral cover. It is formed by the wall surface 11c.

As clearly shown in FIG. 2, the wall surface 11c of the toothed cover 11 facing the tooth tip trajectory surface of the ring gear 4 approaches the tooth tip trajectory surface as it goes in the rotational direction α of the ring gear 4. Also, wall surface 11c
A lubricating pressure generating recess 12 is formed in the gear, and this recess is communicated with each lubricating part of the gear device through an oil passage 13.

The operation of the above embodiment will be explained next.

The rotation of the drive pinion 3 is input to the differential gear 2 via the ring gear 4, and this differential gear can distribute and output the rotation to the left and right front wheels to drive the vehicle.

During this transmission operation, the ring gear 4 drags the lubricating oil and rotates in the α direction in FIG. will be moved further. However, as the wall surface 11c approaches the tooth tip trajectory surface as it moves toward the gear rotation direction,
The lubricating oil moving in the direction of gear rotation while being guided by the toothed cover 11 moves into the recess 1 as the volume decreases.
Generates lubricating pressure within 2. Therefore, the lubricating oil is pumped from the depression 12 through the oil passage 13 to each part, and can lubricate each part.

3 to 5 show an example of application of the present invention in a case where the gear device is composed of a pair of bevel gears 20 and 21 that are meshed and housed in the housing 1.
The bevel gear 20 is supported in the housing 1 by thrust bearings 22 and 23 via a retainer 24, the bevel gear 21 is connected to an output shaft 25, and this output shaft is supported in the housing 1 by thrust bearings 26 and 27. . Such a gear device is a bevel gear 2.
0 in the right angle direction via the bevel gear 21
5 can be transmitted.

In the present invention, the following lubricating pressure generating structure 30 is set for such a gear device. That is, a tooth profile cover 31 is provided that completely surrounds the partial tooth profile 21a of the bevel gear 21 at a level below the lubricating oil level indicated by L in FIG. Install with 32. Teeth type cover 3
1 has side cover wall surfaces 31a, 31b and a tooth tip cover wall surface 31c, and the wall surface 31c facing the tooth tip trajectory surface of the bevel gear 21 is clearly shown in FIG.
As the bevel gear 21 moves toward the rotation direction α, the bevel gear 2
Approach the tooth tip trajectory surface of No.1. Further, a lubricating pressure generating recess 33 is formed in the wall surface 31c, and this recess is communicated with a lubricating part of the gear device, such as the thrust bearings 22 and 23, through an oil passage 34.

In this example as well, the lubricating pressure generating structure 30 can pump lubricating oil by the same action as described above, but in addition, since the toothed cover 31 is separate from the housing 1, it can be removed from the housing 1. The teeth contact of the bevel gears 20, 21 can be confirmed through the toothed cover insertion opening, and when replacing the lubricating oil, it can be used to drain old lubricating oil from the opening.

(Effects of the invention) As described above, the present invention has a structure in which a small and inexpensive tooth-shaped cover is provided and the lubricating pressure is generated by the built-in gear.The lubricating pressure generating structure does not make the gear device expensive or large. There is nothing to do, and there is no power loss.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a final drive showing one embodiment of the present invention, Fig. 2 is a cross-sectional view taken from the side of Fig. 1, and Fig. 3 is a longitudinal cross-sectional view of a bevel gear device showing another example of the present invention. , Figure 4 is a developed cross-sectional view, and Figure 5 is a developed cross-sectional view.
The figure is a - sectional view of FIG. 1...Housing, 2...Differential gear, 3...Final drive pinion, 4...
...Final drive ring gear, 10,30...
...Lubricating pressure generation structure, 11, 31...Tooth-shaped cover,
12, 33...Lubricating pressure generation depression, 13, 34...
Oil passage, 20, 21... bevel gear.

Claims (1)

[Claims for Utility Model Registration] In a gear device that transmits power through gears in a housing containing lubricating oil, there is provided a tooth profile cover that completely surrounds a part of the tooth profile of the gear at a level below the level of the lubricating oil. The tooth profile cover is fixed to the housing, and a wall surface facing the tooth tip trajectory surface of the tooth profile cover is brought closer to the tooth tip trajectory surface as it goes in the gear rotation direction, and a lubricating pressure generating depression is formed in the wall surface. Lubricating pressure generation structure for gear devices.