JP2678694B2 - Interdef mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a large-sized automobile having two rear wheels. The present invention relates to a device for transmitting a driving force transmitted from a propeller shaft to a first axle and transmitting a driving force to a second axle via a differential gear that absorbs a rotation difference between a first axle and a second axle. Regarding

[0002]

2. Description of the Related Art FIG. 4 is a structural diagram of a conventional inter-diff mechanism. This mechanism is a differential mechanism for transmitting a driving force to each of the first axle 1 and the second axle 2 and absorbing a rotation difference generated between the first axle 1 and the second axle 2. That is, the input shaft 3 to which the driving force from the propeller shaft is input, the spider 5 fixed to the input shaft 3 so as to form an orthogonal axis, and the four rotatably attached to the spider 5 (however, 2 A drive gear for transmitting a driving force to the first axle 1 coaxially and rotatably fitted to the input shaft 3 with a diff pinion 7 (not shown) and a diff gear 9 meshing with the diff pinion 7 on the front side. 11, a side gear 13 that meshes with the diff pinion 7 on the rear side and is coaxially and rotatably fitted to the input shaft 3, and a through shaft that is coupled to the side gear 13 by a spline structure and transmits a driving force to the second axle 2. 15 and.

In the interdef mechanism of this conventional example structure,
The rotational driving force input to the input shaft 3 is transmitted to the first axle 1 via the spider 5, the differential pinion 7, and the drive gear 11, and is also transmitted via the differential pinion 7, the side gear 13, and the through shaft 15. It is transmitted to the second axle 2. During normal driving, the first axle 1
The second axle 2 and the second axle 2 usually rotate at the same speed, but when the tire pressure on one side drops, or when the vehicle is traveling on a slippery road surface and slipping occurs,
In addition, there may be a difference in rotation between the first axle 1 and the second axle 2. At this time, the differential pinion 7 is configured to rotate and absorb the difference. When the diff pinion 7 is rotating, a rotation difference occurs between the input shaft 3 and the drive gear 11 and between the input shaft 3 and the side gear 13 which are coaxial structures and are rotatably fitted to each other. .

[0004]

With such a mechanism, it is preferable that a rotation difference between the first axle 1 and the second axle 2 rarely occurs, but for some reason, such as traveling on a snowy road, If it happens frequently or constantly,
As described above, heat is generated in the rotatably fitted portions of the coaxial structure between the input shaft 3 and the drive gear 11 and between the input shaft 3 and the side gear 13. Among them, between the input shaft 3 and the drive gear 11, the drive gear 11
There are known measures such as providing an oil passage of a fine hole penetrating through to supply lubricating oil. However, regarding a portion between the input shaft 3 and the side gear 13 which is rotatably fitted, Due to its small length, no special measures have been taken so far.

That is, the inter-diff mechanism is generally mounted in the axle housing and immersed in the lubricating oil. This input shaft 3 and side gear 13
The fitting portion between and has a structure surrounded by the side gear 13, which is a structure in which oil does not easily enter. Therefore,
When the rotation difference between the first axle 1 and the second axle 2 continues for a long time, the heat generation becomes a problem when the natural refueling is exhausted.

An object of the present invention is to improve this, and to provide a structure capable of positively supplying lubricating oil to a fitting portion between the input shaft 3 and the side gear 13.

[0007]

According to the present invention, an oil sump is formed around a through shaft, and the spline structure of the through shaft and the side gear has at least a part of one or more teeth cut off from the oil sump. Is formed, and an oil groove formed in a direction substantially parallel to the axis is provided on the joint surface of the fitting structure between the side gear and the input shaft.

[0008]

With this structure, the oil sump is filled with the lubricating oil that has been scraped up by the ring gear, and the lubricating oil in this oil sump passes through the oil passage formed by the lack of the teeth of the spline structure and the end of the input shaft. Reach the department. further,
This lubricating oil penetrates into the oil groove formed on the joint surface of the fitting structure between the side gear and the input shaft. As a result, the lubricating oil can be constantly supplied between the input shaft and the side gear of the inter-diff mechanism, and seizure can be prevented.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view showing the structure of an inter-diff mechanism of an embodiment of the present invention, FIG. 2 is a sectional view of the through shaft in the embodiment of the present invention taken along the line AA in FIG. 1, and FIG. 3 is an input shaft in the embodiment of the present invention. 2 is a sectional view taken along line BB shown in FIG.

In the embodiment of the present invention, an input shaft 3 to which a driving force from a propeller shaft (not shown) is input, a spider 5 fixed so as to form an orthogonal axis with the input shaft 3, and a rotation on the spider 5. The input shaft 3 integrally formed with a diff pinion 7 that is freely attached and a diff gear 9 that meshes with the diff pinion 7 on the front side.
A drive gear 11 which is coaxially and rotatably fitted to the first axle 1 to transmit a driving force to the first axle 1, a side gear 13 which is meshed with the diff pinion 7 on the rear side and is coaxially and rotatably fitted to the input shaft 3, and the side gear 13 And a through shaft 15 which is coupled to the second axle 2 by a spline structure and which transmits a driving force to the second axle 2. As a feature of the present invention, the oil sump 4 is formed around the through shaft 15, and the through shaft 15 is provided.
As shown in FIG. 2, the spline structure between the side gear 13 and the side gear 13 forms an oil passage 15a from the oil sump 4 in which three teeth are missing, and a joint surface of the fitting structure between the side gear 13 and the input shaft 3 is formed. Is provided with eight oil grooves 3a formed in a direction substantially parallel to the axis.

Next, the refueling operation of the embodiment of the present invention thus constructed will be described.

When the lubricating oil lifted up by the rotation of the ring gear 10 is filled in the oil sump 4, the oil passages 15 formed at three places by the through shaft 15 and the side gear 13 shown in FIG.
Lubricating oil flows into a. Although the through shaft 15 rotates at high speed together with the side gear 13, since the diameter of the through shaft 15 is small, the lubricating oil that has flowed into the oil passage 15a is not greatly affected by the centrifugal force and flows in the direction of the arrow shown in FIG. It moves, flows into the eight oil grooves 3a formed by the side gear 13 and the input shaft 3 shown in FIG. 3, and flows into the oil chamber 6 through the meshing surfaces of the side gear 13 and the differential pinion 7. The lubricating oil that has flowed into the oil chamber 6 is discharged from the discharge port 8 and is rebounded by the ring gear 10.

Since such an operation is continuously performed during the operation of the internal combustion engine, the side gear 13 and the input shaft 3 are
And journal section, differential pinion 7 and side gear
Lubricating oil is positively supplied to the meshing surface with 13 without interruption, and seizure is prevented.

[0014]

As described above, according to the present invention, it is possible to constantly perform simple machining on the conventional parts to constantly maintain the interface between the input shaft and the side gear of the inter-diff mechanism and the meshing surface between the differential pinion and the side gear. Lubricating oil can be supplied, and seizing can be prevented.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing the configuration of an interdef mechanism according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA shown in FIG. 1 of the through shaft according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line BB of FIG. 1 of the input shaft according to the embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a conventional example inter-diff mechanism.

[Explanation of symbols]

 1 1st axle 2 2nd axle 3 Input shaft 3a Oil groove 4 Oil sump 5 Spider 6 Oil chamber 7 Differential pinion 8 Discharge port 9 Differential gear 10 Ring gear 11 Drive gear 13 Side gear 15 Through shaft 15a Oil passage

Claims (3)

(57) [Claims] 1. An input shaft to which a driving force from a propeller shaft is input, a spider fixed so as to form an axis orthogonal to the input shaft, a diff pinion rotatably attached to the spider, and a diff pinion. A drive gear that is integrally formed with a diff gear that meshes on the front side and is coaxially and rotatably fitted to the input shaft to transmit driving force to the rear first axle; and a drive gear that meshes with the diff pinion on the rear side and is coaxial and rotatable with the input shaft. In an inter-diff mechanism including a side gear fitted to the side gear and a through shaft that is coupled to the side gear by a spline structure and transmits a driving force to the rear second axle, an oil sump is formed around the through shaft, and The shaft and the side gear have one or more spline structures. At least a part of the teeth is cut off to form an oil passage from the oil reservoir, and an oil groove formed in a direction substantially parallel to the axis is formed on the joint surface of the fitting structure between the side gear and the input shaft. An inter-def mechanism that is provided. 2. The inter-diff mechanism according to claim 1, wherein the oil passage has a structure in which three teeth of the female spline on the side gear side are missing. 3. The inter-diff mechanism according to claim 1, wherein the oil groove is eight grooves provided on the input shaft side.