JPH03541B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubrication structure for a transmission using a split case.

2. Description of the Related Art Conventionally, a transmission shown in FIG. 1, for example, is known as a transmission installed in a tractor for driving agricultural machinery and the like.

In Fig. 1, 1 and 2 are split-type cases, and when the cases 1 and 2 are combined, a drive shaft 3 that inputs engine rotation is supported on the upper part via a bearing 4, and a gear is attached to the drive shaft 4. 5 is fixed.

At the bottom of the cases 1 and 2, an output shaft 6 for taking out the deceleration rotation is similarly supported via a bearing 4, and a double chain 7 is connected to the gear 7 fixed to the output shaft 6 and the gear 5 of the drive shaft 4.
By rotating the rotation of the drive shaft 3, the rotation of the drive shaft 3 is decelerated and transmitted to the output shaft 6.

On the other hand, in order to supply lubricating oil to the bearing 4 of the drive shaft 4 provided in the upper part, an oil receiver 9 formed by fitting the cases is provided inside the case.
Lubrication holes 10 are formed in the case on both sides of the oil pan 9 and reach the bearing 4 from the top.The oil pan 9 collects lubricant oil scattered by the rotation of the chain 7 and gear 5, and the oil is collected through the lubrication holes 10. It is supplied to the bearing 4 part.

However, in the case of lubrication using oil pans formed by such case fitting, as shown in FIG. This may cause a step d in the oil pan 9.
If a step is created in the area, a large amount of the lubricating oil 11 scattered by the rotation of the gear 5 will accumulate in the lower part of the oil pan 9 on the case 2 side as shown in the figure. There was a problem in that the lubricating oil only flowed to the bearing 4 on the right side, making it impossible to supply sufficient lubricating oil to the bearing 4 on the left side, which had a high level difference.

The present invention was made in view of these conventional problems, and it is possible to supply sufficient lubricating oil to the bearings on both sides of the oil receiver with a simple structure without increasing the machining accuracy of the split case. The object of the present invention is to provide a lubrication structure for a transmission.

In order to achieve this object, the present invention extends the gasket interposed between the mating surfaces of the split case to the mating part of the oil pan, and forms a partition wall that partitions the oil pan on both sides at the mating part of the oil pan. By extending upwards and forming independent oil receivers separated by gaskets on both sides of the case mating part, even if there is a step in the case mating part, sufficient lubricating oil can be supplied to the bearing parts on both sides. It has been made possible to supply it.

Embodiments of the present invention will be described below based on the drawings.

FIG. 3 is a sectional view showing one embodiment of the present invention on the drive shaft side of FIG. 1. first,
To explain the structure, 1 and 2 are cases with a split structure, and the cases 1 and 2 are fastened together by bolts with a gasket 12 interposed between the mating surfaces of the cases 1 and 2. On the other hand, the drive shaft 3 that inputs the engine rotation is case 1.
side bearing 4 and case 2 side bearing 4
A gear 5 for driving a chain is fixed to the drive shaft 3 by spline fitting or the like. Further, a cover 14 is attached to the outside of the bearing 4 provided in the case 1 via a seal 13, and a cover 14 is attached to the outside of the bearing 4 provided in the case 2.
A cover 15 is also attached to the outside.

On the other hand, inside the cases 1 and 2 located above the bearing 4, an overhang 1 forming an oil receiver 9 is provided.
6a and 16b are integrally formed, and the overhanging portion 16
The upper base of a and 16b is case 1,
2 is hollowed out to a position reaching a lubrication hole 10 that vertically penetrates therein, and the oil pan 9 is communicated with the lubrication hole 10 that extends to the bearing 4.

The overhanging parts 16a, 1 of such cases 1, 2
Regarding the oil pan 9 formed by 6b, in the present invention, the gasket 12 interposed between the mating surfaces of the cases 1 and 2 is extended to the mating part of the overhanging parts 16a and 16b,
In addition, a partition portion 18 having a size to partition the oil receiver 9 into left and right sides is integrally formed in the gasket 12.

FIG. 4 is an end view of the embodiment shown in FIG. 3, as seen from the mating surface side of the case 1, in which a plurality of bolt holes 20 are provided in the mating surface 19 of the case 1, and a plurality of bolt holes 20 are provided relative to the lubricating holes 10 indicated by broken lines. A pair of projecting portions 16a projecting diagonally upward from the inside of the case 1 are formed on both sides of the upper portion of the bearing storage portion 21.
The inside of the overhanging portion 16a is used as an oil receiver 9.

FIG. 5 shows the packing 12 used in the embodiment shown in FIG. 3, with bolt holes 22 drilled in the packing 12 at positions corresponding to the bolt holes 20 shown in FIG. It is integrally provided with a partition part 18 interposed between the mating part of the overhanging part 16a of the case 1 shown in FIG. 4, and this partition part 18 extends upward from the oil pan 9 shown by the broken line, With the gasket 12 interposed between the mating surfaces of the cases 1 and 2, the partition portion 18 forms a dam that divides the oil pan 9 into both sides.

Next, the effects of the embodiments of the present invention will be explained.
Due to variations in the processing of cases 1 and 2, when cases 1 and 2 are joined together by bolting, the overhanging portion 16
Even if there is a step in the mating part of a and 16b, since the partition part 18 of the packing 12 is interposed in the mating part, the lubricating oil collected in the oil pan 9 due to the rotation of the gear 5 will flow through the partition part 18 of the packing 12. Independent levels are maintained on both sides, and even if there is a step at the joint of the overhanging parts 16a and 16b forming the oil pan 9, the oil can be kept at an independent level on both sides through the lubrication hole 10 due to the independent oil pans on both sides by the partition part 18. Sufficient lubricating oil can be supplied individually to each of the bearings 4.

FIG. 6 is a sectional view showing another embodiment of the present invention, and this embodiment includes a case 1 forming an oil pan,
The overhanging portions 16a and 16b in 2 have an overhanging shape with an inclined surface downward toward the lubricating hole 10 side, and
It is characterized in that a partition part 18 of the gasket 12 that partitions the oil receiver on both sides is interposed at the joint part of the overhang parts 16a and 16b.

According to the embodiment shown in FIG. 6, the lubricating oil collected in the oil pan 9 is quickly transferred to the bearing 4 because the projecting portions 16a and 16b have inclined surfaces that go down toward the lubricating hole 10. lubrication performance can be further improved.

Furthermore, in the embodiment shown in FIG.
Even if the overhanging parts 16a and 16b are not interposed in the mating part of the bearings 6a and 16b, since they have sloped surfaces that go down toward the lubricating hole 10 side, even if there is a step in the mating part, they are almost uniform with respect to the bearings 4 on both sides. can supply lubricating oil to

Next, to explain the effects of the present invention, the gasket interposed on the mating surface of the split case extends to the mating part of the oil pan provided in the case, and the partition partitions the oil pans on both sides at the mating part of the oil pan. Because it extends upward to form a wall, even if there is a step in the mating part of the case that forms the oil pan due to variations in machining, the oil can be prevented by interposing the gasket in the mating part and partitioning the oil pan on both sides. The lubricating oil can be supplied almost uniformly from the receiver to the bearings on both sides, and even if there is a step in the case mating part that forms the oil receiver, the lubricating oil will not be sufficiently supplied to the bearing on the side with the higher step. It is possible to reliably prevent bearing seizure and the like.

In addition, sufficient lubricating oil can be supplied to the bearings on both sides simply by changing the shape of the packing, so the structure is simple and can be realized at low cost.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an example of a conventional reduction gear.
Fig. 2 is a cross-sectional view showing the conventional lubricating structure shown in Fig. 1, Fig. 3 is a cross-sectional view showing an embodiment of the present invention, and Fig. 4 is a combination of one case in Fig. 3. 5 is an explanatory diagram of the packing used in the embodiment of FIG. 3, and FIG. 6 is a sectional view showing another embodiment of the present invention. 1, 2...
... Case, 3 ... Drive shaft, 4 ... Bearing, 5, 7 ... Gear, 6 ... Output shaft,
8... Chain, 9... Oil receiver, 10... Lubrication hole, 11... Lubricating oil, 12... Packing, 13...
...Seal, 14, 15...Cover, 16a, 16
b...Protrusion part, 18...Partition part, 19...Matching surface, 20, 22...Bolt hole, 21...Bearing storage part.

Claims (1)

[Claims] 1. A gear shaft is supported in a split case via a bearing, and an oil receiver formed by fitting the cases is provided in the split case, and the oil receiver collects oil scattered by gear rotation. In the transmission lubrication structure for supplying the bearing to the bearing, a packing interposed on the mating surface of the split case extends to the mating portion of the oil receiver, and the packing extends above the oil receiver mating portion. A transmission lubrication structure characterized by forming a partition wall that separates the left and right case sides.