JPH062079Y2 - Defarency device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to improvement of a lubricating oil injection structure in a differential device.

[Prior art]

A conventional differential device, as shown in FIG.
A pinion 3 of a differential shaft (hereinafter referred to as a differential shaft) 2 connected to a propeller shaft 1 and a ring gear 5 fixed to a case 4 are meshed with each other,
A predetermined amount of lubricating oil is contained in a differential casing (hereinafter referred to as a differential casing) 8 that is connected to the differential carrier 7 that supports the differential shaft 2 and covers the case 4.

By the way, the differential device is shown in FIG.
As shown in FIG.
The differential shaft 2 is arranged below the central axis of the ring gear 5 so that the ring gear 5 and the pinion 3 mesh with each other. By arranging the diff shaft 2 in this way, the front bearing 9a and the rear bearing 9b supporting the diff shaft 2 are located below the liquid level L of the lubricating oil, so that both bearings 9a and 9b can be lubricated without problems. Oil is supplied.

However, in recent years, it has been required to dispose the propeller shaft straightly. Therefore, as shown in FIG. 6 (b),
A so-called reverse rotation differential type differential device has been proposed in which the differential shaft 2 is arranged so that the ring gear 5 and the pinion 3 mesh with each other above the central axis of the ring gear 5. In such a device, the differential carrier 7 is provided with a lubricating oil passage for guiding the lubricating oil scraped up in the differential casing 8 along with the rotation of the ring gear 5 to the bearings 9a, 9b side.

However, even in the case of the reverse diff type differential device as described above, the differential casing 8 is conventionally used.
Since the lubricating oil injection port is formed in the upper part of the bearing, the bearings 9a and 9b in the differential carrier 7 are lubricated when the lubricating oil is injected from the lubricating oil injection port after the differential device is attached to the propeller shaft. No oil supply. As a result, after the vehicle manufacturing process is completed,
There is a risk that both bearings 9a and 9b may be damaged when the engine is first started, and as a result, the reliability of the differential device is reduced.

[Purpose of device]

The present invention has been made in consideration of the above-mentioned conventional problems, and prevents damage to both bearings when the engine is first started after the manufacturing process of the vehicle is completed. It is an object of the present invention to provide a differential device that can improve the performance.

[Constitution of device]

In order to achieve the above object, the differential device according to the present invention is a differential device in which a drive pinion meshing with a ring gear provided in a differential casing is offset above a central axis of the ring gear. Inside the differential carrier that is connected to the casing and that supports the drive pinion, there are a front bearing and a rear bearing that support the differential shaft, an oil reservoir that is located near these bearings and that supplies lubricating oil to both bearings, and the above ring. A lubricating oil passage for guiding the lubricating oil scraped up in the differential casing with the rotation of the gear to the oil reservoir is provided, and the differential carrier is filled with the lubricating oil injected at the time of lubricating oil injection. The lubricating oil injection port is provided at a position where it stays in the pool, and when the lubricating oil is injected from the lubricating oil injection port in the vehicle manufacturing process, the lubricating oil is retained in the oil pool near both bearings. It is what

〔Example〕

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

As shown in FIG. 1, a differential shaft (hereinafter referred to as a differential shaft) 11 is rotatably supported by a front bearing 23 and a rear bearing 31 which are located in front of and behind a differential carrier (hereinafter referred to as a differential carrier) 22. There is. The front end of the diff shaft 11 has a propeller shaft 12 that transmits the drive of the engine.
And a drive pinion 13 is provided at the rear end. The drive pinion 13 meshes with a ring gear 16 fixed to the flange portion 14a of the case 14 with a bolt 15 above the center axis of the ring gear 16 (see FIG. 2).

As shown in FIG. 4A, the outer periphery of the ring gear 16 and the outer periphery of the flange portion 14a of the case 14 are blades 16a ...
... and are formed. In addition, the flange portion 14a,
As shown in FIG. 1, the impeller 27 is fastened together with the bolts 15, and on the outer periphery of the impeller 27, as shown in FIG. 4 (b), the blades rising radially at a predetermined angular interval. 27a ... Are formed.

As shown in FIG. 1, the case 14 includes a differential carrier 22.
Is rotatably supported by bearings 24 at the left and right positions of the bevel gears 18 and 19, which are opposed to each other by a short shaft 17 in the vehicle front-rear direction, and the pair of bevel gears A bevel gear group composed of another pair of bevel gears 20 and 21 arranged to face each other so as to mesh with 19 is arranged. A differential casing (hereinafter referred to as a differential casing) 25 is connected to the flange portion 22a of the differential carrier 22 so as to cover the bevel gear group and the ring gear 16, and inside the differential casing 25,
As shown in FIG. 2, the lubricating oil is contained so as to have a predetermined level L. Further, on the rear side of the differential casing 25, there is provided a level bolt 36 for draining the lubricating oil from the differential casing 25 when the lubricating oil is injected above the predetermined level L. Also, the differential casing 25
A drain plug 29 is provided at the bottom of the.

On the other hand, as shown in FIG. 1, a lubricating oil passage 26 is formed on one side of the diff carrier 22 substantially parallel to the diff shaft 11. The lubricating oil passage 26 is provided at one end thereof with a lubricating oil inlet 26a opening to the outer peripheral side of the ring gear 16, and at the other end thereof, the lubricating oil opening between the bearings 23 and 31. A discharge port 26b is provided. Similarly, a lubricating oil passage 30 is formed in the upper portion of the differential carrier 22 as shown in FIG. 3, and this lubricating oil passage 30 is provided in the differential shaft 1 as shown in FIG.
1 is provided substantially in parallel with the lubricating oil inflow port 30a, which is open at the upper end of the outer periphery of the ring gear 16 at both ends thereof.
And a lubricating oil discharge port 30b opening between both bearings 23 and 31.

Further, on the lower side inside the differential carrier 22, both bearings 23 and 31 with the lubricating oil discharge ports 26b and 30b opened.
A recess-shaped oil sump 28 is provided in which the lubricating oil can be retained in a range from the space to the front side of the front bearing 23. The rear side of the oil sump 28 communicates with the inside of the differential casing 25 by a lubricating oil passage 33 having a rear bearing 31 provided therein. A lubricating oil inlet 34 for injecting lubricating oil from the outside into the differential device is provided on the peripheral wall of the differential carrier 22 above the oil sump 28 between the bearings 23 and 31. There is. A plug 35 is screwed into the lubricating oil inlet 34.

In the above structure, when the engine starts to operate, the driving force of the engine is transmitted to the drive pinion 13 via the propeller shaft 12 and the differential shaft 11. As a result, the ring gear 16, the case 14, and the impeller 27 rotate, so that the blade 16a of the ring gear 16, the blade 14b of the flange portion 14a of the case 14, and the impeller 2
The lubricating oil contained in the differential casing 25 is scraped up by the blades 27 a of No. 7. The lubricant oil thus scraped up is supplied to the lubricant oil inlets 26a, 3a of the differential carrier 22.
0a into the lubricating oil passages 26 and 30, and the lubricating oil discharge passages 26b and 30b through the lubricating oil passages 26 and 30 to the oil sump 28. Therefore, even in the reverse differential type differential device, the lubricating oil can be efficiently supplied to both bearings 23 and 31.

Further, when manufacturing a vehicle, after assembling the differential device having the above-described configuration to the propeller shaft 12,
Lubricating oil is injected from the lubricating oil inlet 34. At this time, the lubricating oil is supplied to the oil sump 28 and the oil sump 2
The lubricating oil overflowing from No. 8 flows into the differential casing 25 via the lubricating oil passage 33. In this way, since the lubricating oil is contained in both the oil sump 28 and the differential casing 25, after the automobile is manufactured,
Even when the engine is started for the first time, both bearings 23 and 31 are filled with oil 28 when lubricating oil is injected.
The lubricating oil staying inside will be immediately supplied throughout. Therefore, both bearings 23 and 31
Damage is prevented. In addition, when the viscosity of the oil is high, such as during cold weather, the lubricating oil passage 26
Even when the engine operation is started in a state in which the lubricating oil via 30 is difficult to be supplied to the oil sump 28, the lubricating oil already retained in the oil sump 28 at that time is stored in both bearings 23. As it is immediately supplied to the bearing 31, damage to these bearings 23 and 31 is prevented.

[Effect of device]

The differential device according to the present invention is, as described above,
Inside the differential carrier, which is connected to the differential casing and supports the drive pinion, are the front and rear bearings that support the differential shaft, the oil reservoir that is located near these bearings and that supplies lubricating oil to both bearings, and the ring. A lubricating oil passage for guiding the lubricating oil scraped up in the differential casing with the rotation of the gear to the oil reservoir is provided, and the lubricating oil injected at the time of injecting the lubricating oil is retained in the oil reservoir in the differential carrier. This is a configuration in which a lubricating oil injection port is provided at the position.

Therefore, when the lubricating oil is injected from the lubricating oil injection port in the vehicle manufacturing process, the lubricating oil is accumulated in the oil pool that provides the lubricating oil to both bearings. Even when the first operation is started, both bearings will be immediately supplied with lubrication oil, which will prevent damage to these bearings and, as a result, increase the reliability of the differential. There is an effect that can be done.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a plan view of a cross section of an essential part, FIG. 2 is a vertical sectional front view, and FIG. 3 is a rear surface of a case shown in FIG. Fig. 4 (a) is a front view of a main part of a ring gear and blades of a differential case, Fig. 4 (b) is a front view of a main part of an impeller, and Fig. 5 is a cross-sectional plan view of the main part of a conventional differential device. Figure, Figure 6 (a)
(B) is a side view showing an arrangement structure of the differential device. 11 is a differential shaft (differential shaft), 1
3 is a drive pinion, 16 is a ring gear, 22 is a differential carrier (differential carrier), 23 is a front bearing, 25 is a differential casing (differential casing), 26 and 30 are lubricating oil passages, 28 is an oil reservoir, 31 is a rear bearing, Reference numeral 34 is a lubricating oil inlet.

Claims (1)

[Scope of utility model registration request] 1. In a differential device in which a drive pinion meshing with a ring gear provided in a differential casing is offset above a central axis of the ring gear, a differential carrier connected to the differential casing and supporting the drive pinion is provided. Inside, the front and rear bearings that support the differential shaft, and the oil reservoir that is located in the vicinity of these bearings and that supplies lubricating oil to both bearings, and scrapes up in the differential casing as the ring gear rotates. The lubricating oil passage for guiding the lubricating oil to the oil sump is provided, and the differential carrier is provided with the lubricating oil injection port at the position where the lubricating oil injected at the time of injecting the lubricating oil stays in the oil sump. Differential gear and butterflies.