JPS6084472A - Gear shaft of speed change gear and preparation thereof - Google Patents

Abstract

PURPOSE:To permit a proper amount of lubricating oil to be always supplied onto bearing parts by allowing the hollow part of a gear shaft to be filled with porous material. CONSTITUTION:Lubricating oil is introduced into the inside of a bearing housing 6 from the oil passage 19 of a receiving member 24 and lubricates bearings 21 and 22. At the same time, lubricating oil is sent into a hollow part form the right edge part of a gear shaft 23 and wets porous material 39. When the number of revolution of a gear shaft 23 is low, and the amount of oil scraped-up by a crown gear 19 is little, the lubricating oil in the porous member 39 which fills the inside of the gear shaft 23 is collected onto the inner peripheral surface of the hollow part by a centrifugal force and supplied onto the slide surfaces of the bearings 21 and 22 through oil passages 37 and 38. Therefore, a necessary sufficient amount of lubricating oil is supplied onto the bearings 21 and 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a gear shaft in a final reduction gear of a vehicle and a method of manufacturing the gear shaft.

End of decline? jAI! For gear shafts such as N, the gear has Tl.
1I The spilled lubricating oil is guided to the bearing part, but the bearing part of the gear shaft is far from the oil level of the case, and even if grooves are provided in the sliding part, centrifugal force acts during operation, causing it to reach the bearing part. It is difficult for lubricating oil to reach the bearing, and sufficient lubrication of the bearing cannot be obtained.

Therefore, as shown in, for example, Japanese Utility Model Application Publication No. 57-156, lubricating oil is introduced into the hollow part of the gear shaft from a passage provided in the wall of the case using an oil pump or other appropriate means, and then the lubricant is introduced into the hollow part of the gear shaft. A system has been proposed in which lubricating oil is supplied to the gear bearing through a radial passage, but this not only requires a lot of effort in machining the gear shaft to make it hollow, but also requires lubricant to be supplied to the hollow part. The disadvantage is that the cost increases because an oil pump or the like must be installed to guide the flow.

The first object of the present invention is to provide a transmission, etc., which can be easily manufactured, retains l1ltl lubricating oil in the hollow part, and always supplies an appropriate amount of lubricating oil to the bearing part by centrifugal force. Each gear shaft is provided.

A second object of the present invention is to provide a method for manufacturing gear shafts such as transmissions, which achieves the first object and allows for inexpensive IFi manufacturing of hollow gear shafts without machining.

For this reason, the configuration of the present invention is such that the gear shaft is hollow, one end of this hollow part is closed with a plug g4, and the other end is opened to the oil reservoir side of the case, and the hollow part is filled with a porous member,
A radial oil passage communicating with the hollow portion is provided in the bearing portion of the gear shaft.

The present invention will be explained based on an example of a gear shaft of a final reduction gear of a vehicle. As shown in FIG. 1, in the final reduction gear, a case 8 is connected by bolts 9 to an opening in the front wall of an axle case 10, which has a rectangular cross section at the middle part, and an opening in the rear wall (a hemispherical opening). It is closed by a cover 11.

A differential gear rear 13 is supported inside the axle case 10 by bearings (not shown) whose boss portions formed at both end portions are surrounded by bearing caps 15. The carrier 13 of the differential gear is a divided body divided along a plane including the axis of rotation, and is joined together with bolts 12, and a boss portion supported by the aforementioned bearing is integrally formed on one end side, while a boss portion supported by the above-mentioned bearing is formed on the other end side. A wheel body 27 having reinforcing ribs extending radially is connected with a plurality of bolts 26, and a boss portion supported by the aforementioned bearing is formed on the wheel body 27. Then, the boss portion having the spline hole 14 of one of the pair of binions of the differential is rotatably supported in the shaft hole of the wheel body 27, and a single shaft is fitted into the spline hole 14. ing. A known crown gear 19 is superimposed on the outer peripheral edge of the disc-shaped ring body 27 and is coupled with a plurality of bolts 28 . Such a configuration is similar to the conventional one, and since it is not directly related to the gist of the present invention, it will not be described further.

The present invention relates to a gear shaft 23 that supports a pinion 18 that meshes with a crown gear 19. This float shaft 23 has an intermediate portion supported by a bearing housing 6 with bearings 21 and 22, and an inner end portion that is supported by a case 8. bearing 1 on the intermediate wall 17 of
6 is supported.

The bearing housing 6 is fitted into the end of the case 8, and the flanges are coupled with the ports 1 to 7. A receiving member 24 is formed integrally with the case 8 between the bearing housing 6 and the intermediate wall 17 and covering one side of the binion 18 . Preferably, an oil passage 29 extending into the interior of the bearing housing 6 is provided in the upper part of the receiving member 24 . A spline 20 is formed on the outer end side of the gear shaft 23, and a joint 4 for coupling the propulsion shaft is spline-fitted to the spline 20. This joint 4
the gear shaft 23 so that its inner end abuts against the inner ring of the bearing 21;
Narrow]-3 is tightened to the screw shaft formed at the outer end of the screw.

The pair of thrust bearings 21 and 22 have their outer rings pressed against an intermediate wall 31 provided on the inner circumference of the cylindrical bearing housing 6, and the inner ring of the bearing 22 is pressed by the end of the pinion 18.
As described above, the inner rings of the bearing 21 are held down by the end faces of the joint 4 so as not to move in the axial direction. A known seal part @5 is installed between the bearing housing and the joint 4, and is configured to prevent dust, muddy water, etc. from entering the bearing 21 from the outside.

As shown in Fig. 2.3, the gear shaft 23 is formed from a pipe material, and a screw plug 2 is screwed into the left end portion of the gear shaft 23 to close the hollow portion.

As shown in FIG. 4, the gear shaft 23 is formed from a pipe material 33 as a raw material. First, the material 33 is heated, and the outer diameter is finished to a predetermined size by pressing the roller 41 against the outer peripheral surface while rotating the material. However, approximately the center portion of the material 33 is a shaft portion 22a into which the inner ring of the bearing 22 is fitted, and the left end side thereof is a shaft portion 21a into which the inner ring of the bearing 21 is fitted by swaging processing, and a shaft portion where the spline 20 is provided. 20
A and the shaft portion 3a on which the screw is installed are sequentially formed.

Further, on the right end side of the shaft portion 22a, as shown in FIG. 5, the roll 42 is pressed to form the shaft portion 18a for spline fitting the binion 18 and the shaft portion 16a for fitting the inner ring of the bearing 16. .

As shown in FIG. 6, a bead is formed between the shaft portion 18a and the shaft portion 16a to form an annular vortex 32a. and,
In addition to finishing the surface of each shaft part by smooth machining,
A spline is machined on the shaft portion 20a and the shaft portion 18a, and a thread groove is formed on the shaft portion 3a. Further, a screw hole 2a for screwing the plug 2 into the shaft portion 3a is machined.

Finally, as shown in FIG. 7, the shaft portion 21a and the shaft 1fi
22a are provided with radial oil passages 37 and 38, respectively. Then, as shown in FIG. 3, the porous member 39 is infiltrated with lubricating oil and then filled into the hollow part of the gear shaft 23, and the plug 2 is screwed into the screw hole 2a to close it. Spline shaft fg1
After fitting the pinion 18 to the ring 8a, the pressure ring 32 is inserted into the annular groove 32a.

The gear shaft 23, which is structured like a mouth and is fixed so that it does not move in the axial direction, is attached to the case 8 as in the conventional case.
and assembled into the bearing housing 6 f].

The present invention is constructed as described above (as shown in FIG. 1, the lubricating oil filled in the bottom of the axle case 1o is scraped up by the crown gear 19,
The oil passage 29 of the member 24 is introduced into the interior of the bearing housing 6 and lubricates the bearing 21,22. At the same time, the gear shaft 23
It is sent from the right end of the hollow part l\ and infiltrated into the porous member 39.

If the rotation speed of the gear shaft 23 is low, the crown gear 19
If the amount of oil scraped up is small, the gear shaft 2
The lubricating oil in the porous member 39 filled inside the inner part 3 is collected by centrifugal force to the inner peripheral surface of the inner part 37, and the oil passage 37.38
is supplied to the sliding surfaces of the bearings 21, 22 through the . Therefore, a sufficient amount of lubricating oil is always supplied to the bearings 21, 22, and problems such as seizure due to insufficient lubricating oil supply when the rotational speed is low can be solved.

As described above, the present invention has the gear shaft 23 made hollow, this hollow part filled with three porous materials such as urethane, and radial oil passages 37 and 38 provided in the bearing part of the gear shaft. During operation, the lubricating oil absorbed in the porous member 39 is pushed toward the inner peripheral surface of the hollow part by the centrifugal nozzle caused by the rotation of the gear shaft, and the oil passage 37. ．． 38 to the bearing supporting the gear shaft.

According to the present invention, the weight can be reduced by making the gear shaft hollow, and the porous member 39, such as a sponge made of urethane filled in the hollow part, is relatively lightweight and absorbs and retains lubricating oil while the case Centrifugal force supplies oil from the inside to the gear shaft bearings and transmission gear bearings, which are far from the oil reservoir and difficult to lubricate, so sufficient lubrication can be achieved without the need for an oil pump. It can extend the durability or life of a transmission.

Although lubricating oil is supplied to the hollow portion of the gear shaft 23 from one end side as described above, the passage 29 of the receiving member 24 does not necessarily need to be provided.

Further, the present invention is not limited to the final reduction gear, but can be applied to the output shaft of a gear transmission that adjusts the running speed of a vehicle.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a final I four-speed gearbox for a vehicle equipped with a gear shaft according to the present invention, FIG. 2 is a side view of the same gear shaft, and FIGS. 3 to 7 explain a manufacturing method of the same gear shaft. It is a side sectional view of a reservoir. 2゛Plug 3: Nut 4: Joint 6: @Supporting ring 17: Intermediate wall of case 19: Crown gear 18:
Pinion 2o; Spline 21° 22: Bearing 23
: Gear shaft 37. 38: Oil passage 39: Porous member Patent applicant: Isuhe Jidosha Co., Ltd. Representative Patent attorney: Toshio Yamamoto Figure 5 Figure 6 Figure 7

Claims (2)

[Claims] (1) The gear shaft is made hollow, one end of this hollow part is closed with a stopper, and the other end is left on the oil reservoir side of the case, the hollow part is filled with a porous material, and the bearing part of the gear shaft is filled with the above-mentioned material. A gear shaft for a transmission, etc., characterized by having a radial oil passage communicating with a hollow part. (2) A vibrator material is used as a material, and a roll is pressed against the outer peripheral surface of the vibrator material while rotating to form a shaft portion that supports gears of different diameters and a shaft portion that is supported by a bearing, and oil-impregnated porous holes are formed in the shaft center. A method for manufacturing a gear shaft for a transmission, etc., comprising forming a hollow portion that houses and covers a material.