JPS6119233Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubricating device for a tandem axle with an interaxle differential (hereinafter referred to as an interdifferential), and in particular to a lubricating device for the above-mentioned interdifferential.

In an inter-differential, the inter-differential case housing the inter-differential gear group is covered with the inter-differential case with a small gap from the outer periphery thereof, so less lubricating oil is stored. Therefore, it is necessary to efficiently supply the lubricating oil to the interdifferential gear group, but since the interdifferential case rotates at high speed, it is difficult to feed the lubricating oil into the interdifferential case. For this reason, conventional methods have been to install a separate supply pump to feed the lubricating oil, or to provide fins or the like in the inter-differential case to actively scrape up the lubricating oil and introduce it into the interior through the oil introduction hole drilled on the side of the inter-differential case. However, the former has problems in terms of space and cost, while the latter simply scrapes up the lubricating oil and introduces it into the interior through the oil introduction hole, so the amount of oil is small and centrifugal force is Therefore, it is difficult to introduce the oil through the oil introduction hole.

The present invention was devised for the purpose of eliminating the drawbacks of the above-mentioned prior art and providing a device that can efficiently introduce a large amount of lubricating oil into the interior of a high-speed rotating interdifferential. A lubricating oil supply hole is provided facing inward from the inner side of the differential case and is substantially parallel to the rotation axis of the differential case, and an oil catcher that covers the inlet side of the hole with an appropriate clearance is fixed to the differential case, and the interdifferential cover is fixed to the oil catcher. The gist is that a lubricating oil passage is provided in the upper part of the annular space formed between the side part and the bearing, and opens to face the rotational direction of the interdifferential case.

Hereinafter, the embodiment will be described with reference to the drawings. In the drawings, reference numeral 1 denotes an inter-differential cover, and an input shaft 2 is supported within the cover 1 by a bearing B. Reference numeral 3 denotes an interdifferential case in which an interdifferential gear group 4 is housed, a part of which is formed integrally with the input shaft 2, and the distance between the outer circumferential surface 3a and the inner circumferential surface of the interdifferential cover 1 is set to be relatively small. has been done.

In the above configuration, the input shaft 2
When the is rotated by the power from the engine (located on the right side of Figure 1), the interdifferential case 3 and the interdifferential gear group 4 rotate, and the power is divided by the interdifferential gear group 4, and a part of it is sent to the tandem axle. The other part is transmitted to the front axis and the other part to the rear axis.

S is an annular space formed between the side portion 30 of the inter-differential case 3, the adjacent cylindrical portion 33, and the bearing B.
A plurality of lubricating oil supply holes 31 are provided in the inter-differential case 3 substantially parallel to the rotation axis of the inter-differential case 3, one end of which opens into the annular space S and the other end of which opens into the interior of the inter-differential case 3.

A base portion of an annular oil catcher 5 is fixed to another side portion 32 of the interdifferential case 3 that is substantially continuous with the side portion 30, and the tip portion of the oil catcher 5 is located inside the space S. It protrudes from the hole 31 and is configured to cover the opening end of the hole 31 with an appropriate gap. In this example, the protrusion includes a conical part and a cylindrical part.

As shown in FIGS. 2 and 3, a lubricating oil passage, that is, a gutter 10 in this example, which is open on the side opposite to the rotational direction of the interdifferential case 3, is provided in the upper side of the interdifferential cover 1. The gutter 10 is configured to change direction at a right angle in a substantially horizontal state at the end on the side of the bearing B in the interdifferential cover 1, and to open into the annular space S. 11 indicates the opening (in this example, the substantially vertical end constitutes the opening). The opening 11 is provided at the upper side of the annular space S, facing the rotational direction of the interdifferential case 3, and close to the cylindrical portion 33 of the interdifferential case 3. The annular space S is connected to the bearing B side of the opening 11 from the opening 11 to the bearing B side.
A partition wall 12 is formed that protrudes from the bearing B.
Prevents lubricating oil from leaking to the side.

Note that lubricating oil supplied from a ring gear or a gear train (not shown) is stored at the bottom of the inter-differential cover 1.

In the above configuration, when the interdifferential case 3 rotates, the lubricating oil is lifted upward by the outer peripheral surface 3a and flows into the gutter 10. That is, the lubricating oil is released directly from the outer circumferential surface 3a of the inter-differential case 3 by centrifugal force or radially from the outer circumferential surface 3a of the inter-differential case 3, and adheres to the upper wall surface of the inter-differential cover 1. The flow towards the gutter 10 in the direction flows into the gutter 10.

The lubricating oil that has flowed into the gutter 10 flows out from the opening 11 toward the annular space S, but this lubricating oil flows from the gap between the tip of the oil catcher 5 fixed to the interdifferential case 3 and the cylindrical part 33 into the centrifugal space. The lubricating oil flows into the gap between the oil catcher 5 and the side portion 30 under the force, and forms an annular lubricating oil layer. The lubricating oil supply hole 31 is located in the above gap in the inter-differential case 3.
Since the opening is parallel to the axis of the lubricating oil supply hole 3, the lubricating oil is hardly affected by centrifugal force.
1 and flows into the interior of the interdifferential case 3 to lubricate the interdifferential gear group 4.

As described above, the opening 11 of the gutter 10 has an annular space S
, and has a direction opposite to the rotation of the inter-differential case 3, and has a direction opposite to the rotation of the inter-differential case 3;
Since the lubricating oil spilled there collides with the lubricating oil carried by the opening 11 and the cylindrical part 33 rotating in that direction, the lubricating oil flows near the opening 11. It becomes easy to accumulate in
At this time, the partition wall 12 prevents as much as possible the lubricating oil near the opening 11 from flowing out in the direction of the bearing B, further increasing the lubricating oil retention effect, and preventing the lubricating oil from flowing into the oil catcher 5. The supply amount increases, and eventually the interdifferential case 3 is discharged from the supply hole 31.
The amount of inflow into the country will also increase.

Note that the closer the tip of the oil catcher 5 is to the opening 11, the more lubricating oil flows into the interior thereof, that is, into the annular space formed between the oil catcher 5 and the side portion 30 of the interdifferential case 3. It becomes easier.
In the example in Figure 1, the tip of the conical part is cylindrical,
It is configured to be brought close to the opening 11 to obtain the above effects.

Further, the configuration near the opening 11 as shown in the embodiment is different from that on the other side of the interdifferential case 3, that is, on the first side.
It can also be provided on the left side of the figure (usually where one gear of the gear train is supported by a bearing). Furthermore, in the above example, the lubricating oil to the gutter 10 is
The lubricating oil is supplied through the differential case 3, but what is important here is the configuration near the lubricating oil opening 11.
Therefore, even if the lubricating oil to the gutter 10 is supplied from the other side, for example from the gear train side, or even if it is supplied to the opening 11 through an appropriate passage other than the gutter, the purpose of the present invention can be achieved. .

As described above, the present invention provides a lubricating oil supply hole extending inward from the side of the interdifferential case and is approximately parallel to the rotation axis of the differential case, and an oil catcher that covers the inlet side of the hole with an appropriate gap. is fixed to the differential case, and a lubricating oil passage is provided in the upper side of the annular space formed between the side of the interdifferential cover and the bearing, facing the rotational direction of the interdifferential case. The lubricating oil passages, which open opposite to the rotational direction of the lubricating oil passage, cause lubricating oil to accumulate in the vicinity of the opening, and the lubricating oil supply hole can secure the amount of oil to be supplied. By providing an oil catcher to cover the interdifferential with a gap, the lubricating oil accumulated near the opening is guided to the gap and the amount of oil increases, and the lubricating oil is increased from the side of the interdifferential case to the inside. By providing a lubricating oil supply hole substantially parallel to the rotation axis of the differential case, the lubricating oil accumulated in the gap can be introduced efficiently without being affected by centrifugal force. As a result, even during low speed rotation, due to the lubricating oil retention effect mentioned above,
The lubricating oil can be sufficiently supplied into the inter-differential case, which has the effect of preventing gear seizure.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a main part of an embodiment of the present invention, FIG. 2 is a cross-sectional view corresponding to the cross-sectional view taken along the - arrow in FIG. It is a cross-sectional view corresponding to the - arrow in FIG. 2. Code 1... Inter differential cover, 10... Gutter, 1
1... Opening, 12... Partition wall, 2... Input shaft, 3... Inter differential case, 31...
Lubricating oil supply hole, 4... Inter differential gear group, 5...
Oil catcher, S... annular space.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A lubricating oil supply hole is provided inward from the side of the inter-differential case and is substantially parallel to the rotation axis of the differential case, and an oil supply hole is provided that covers the inlet side of the hole with an appropriate gap. The interdifferential gear is fixed to the differential case, and a lubricating oil passage is provided in the upper side of the annular space formed between the side of the interdifferential cover and the bearing, facing the rotational direction of the interdifferential case. Lubrication device. 2. The inter-differential lubricating device according to claim 1, wherein a partition wall is formed in the vicinity of the opening of the lubricating oil passage and projects parallel to the bearing of the opening.