JPS6121467A - Lubricating structure in extension case - Google Patents

Abstract

PURPOSE:To make an internal bearing support part moldable as one body with an extension case as well as to secure lubricability, by devising both feed and discharge passages of lubricating oil to and from the bearing support part at an end part of the extension case. CONSTITUTION:Inside an extension case 1, there is provided with a discharge passage 10 ranging from a bearing support part 9 of a transfer drive shaft 8 to an end part of the case 1 passing beneath an internal bearing support part 5. And, a feed passage 12 is extendedly installed in one side of the said support part 5, ranging from the connection side with an intermediate case of the case 1 to the end part side of the case 1 passing one side of the support part 5. In addition, in the case 1, there is provided with a connecting hole 13 crossed with the feed passage 12 to the upper side of a guide rib 7 from the side, and also provided with another connecting hole 15 to be crossed with the discharge passage 10 to the downside of the guide rib 7 from the lower part. Furthermore, at one side and the lower side of a bearing support part 4, there are provided with passages 17 and 18 to be interconnected to both upper and lower sides of the guide rib 7.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a lubrication structure for an extension case, in which a case body formed by die-casting and having a bearing support section inside the extension case is provided with a passage for supplying and discharging lubricating oil to the bearing support section at the end of the extension case.

[Prior art]

Constructing the extension case using the die-casting method is superior to using the gravity casting method in that there is less wasted metal, and it can be made smaller and lighter, but this extension case is rear-mounted to the engine housing. In connection, a bearing support for the output shaft is provided centrally inside the dowel. In addition, as a prior art for die-cast extension housings, Japanese Patent Laid-Open No. 56
There is a publication No.-141458.

[Technical issues]

The problem here is that the bearing support part provided in the extension case must be constructed separately due to mold cutting. This was an unavoidable matter, especially for the purpose of forming a passage for supplying and discharging lubricating oil to the case end of the extension case. For this purpose, if a press-fitting part is formed in the extension case to press-fit the bearing support member, the bearing support member is press-fitted into this part. A series of work such as caulking after press-fitting is added.

[Purpose of the invention]

The present invention has been made based on the above circumstances, and advantageously utilizes the advantages of die-casting by providing a structure in which oil and lubrication passages can be secured even when the internal bearing support part is integrally formed with the extension case. The purpose of this invention is to provide a lubricating structure for an extension case.

[Structure of the invention]

For this purpose, the present invention provides an extension case in which a die-cast case body is provided with a bearing support inside the extension case, and a passage for supplying and discharging lubricating oil to the bearing support at the end of the extension case. A supply passage is provided that passes through one side of the internal bearing support part from the connection side of the transfer drive shaft toward the case end, and passes from the bearing support part of the transfer drive shaft under the internal bearing support to the case end. A discharge passage is provided toward the side, and a communication hole is bored above the guide lip for lubricating oil between the internal bearing support and the bearing support at the end of the case to communicate the supply passage with the guide lip. A communication hole is drilled that intersects with the discharge passage and communicates with the bottom of the guide lip, and a bearing support part at the end of the case has a
forming passages communicating with the upper and lower parts of the guide lip;
This is characterized in that the two are communicated through a lubricating oil groove hole in a bushing fitted to the bearing support portion.

【Example】

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. In the figure, numeral 1 is an extension case,
The connection side connected to the intermediate case 2 of the engine drive device has a large opening, and the opposite case end rotatably supports a sleep joke (not shown) of a propeller shaft that is spline-fitted to the output shaft 3. The bearing support part 4 is opened. Further, an internal bearing support part 5 is formed in the center of the interior, and between the internal bearing support part 5 and the above-mentioned bearing support part 4,
A cavity 6 having a diameter smaller than that of the internal bearing support portion 5 is formed, and a guide lip 7 having a square cross section is formed in this cavity. Inside the Exten Ramin case 1, a transfer drive shaft 8 is located below the internal bearing support portion 5.
A bearing support part 9 is formed, and a discharge passage 10 is formed from the bearing support part 9 through under the internal bearing support part 5 toward the case end using a slide core or the like. Further, an example of the internal bearing support portion 5 includes a lip 11.
A supply passage 12 is formed to extend from the connection side of the extension case 1 through one side of the internal bearing support portion 5 to the case end side. After the extension case 1 is die-cast, a communication hole 13 intersecting with the supply passage 12 is cast from the side above the guide rib 7, and a blind plug 14 is attached to the open end of the communication hole 13. Similarly, in the extension case 1, the discharge passage 10 is connected from below to the lower side of the guide rib 7.
A communicating hole 15 that intersects with is cast out, and a blind plug 1G is attached to the open end of the communicating hole 15. Further, at the end of the case, passages 17 and 18 are formed on one side and the lower side of the bearing support portion 4, respectively, and communicate with the upper and lower sides of the guide rib 7. Lubricating oil groove holes 20 and 21 communicating with the passages 17 and 18 are opened in the bush 19.
9 is communicated via an X-shaped guide groove 22, for example. In such a configuration, the lubricating oil scraped up from the transfer gear 23 provided on the output shaft 3 is transferred to the supply passage 12.
It is guided to the case end side through the connecting hole 13 and flows onto the guide rib 7. From here, it enters the passage 11 of the bearing support section 4 and is led to the inner surface of the bush 19 through the slot 20. Further, from the end of the passage 17, the oil is guided to the back surface (inner surface) of the oil seal 24 provided at the end of the bearing support portion 4. While the inner surface of the bush 19 is provided with lubrication through the grooves 22, excess oil flows into the passage 18 through the grooves 21, and flows into the discharge passage 10 through the cavity 6 under the guide rib 7.

【Effect of the invention】

The present invention has been described in detail above, and by molding the internal bearing support portion integrally with the extension case, die-casting can be advantageously utilized and unnecessary work can be eliminated, and with regard to oil lubrication, Since the configuration is such that it can be sufficiently achieved simply by die-casting, the excellent effect of being able to construct an extension case with high lubricity can be obtained even when die-casting is used.

[Brief explanation of drawings]

FIG. 1 is a vertical side view showing an embodiment of the present invention, FIG. 2 is a vertical side view of the main part, and FIG. 3 is a cross-sectional view taken along the line 8-1 in FIG.
FIG. 4 is a sectional view taken along line 8-81 in FIG. DESCRIPTION OF SYMBOLS 1... Extension case, 2... Intermediate case, 3... Output shaft, 4, 5... Bearing support part, 6
... Cavity, 7... Guide rib, 8... Transfer drive shaft, 9... Bearing support part, 10...
Discharge passage, 11... Rib, 12... Supply passage, 13
...Communication hole, 14 river blind plug, 15...Communication hole, 16.
... Blind plug, 17.18 ... Passage, 19 ... Bush, 20.21 ... Lubricating oil groove, 22 ... Guide groove. Figure 3 Figure 4 Procedural amendment (voluntary) August 16, 1980 Commissioner of the Japan Patent Office Gakudono Shiga 1982 Patent Application No. 141759 2 Title of invention Lubrication structure for extension case 3 Make amendments Relationship with the patent case Patent Applicant: 1-7-2-4 Nishi-Shinjuku, Shinjuku-ku, Tokyo, Agent 5, All drawings to be amended (6), Contents of amendment: Engraving of the drawing (no change in content)

Claims (1)

[Claims] In a die-cast case body with a bearing support part inside the extension case, and a lubricant supply and discharge passage to the bearing support part at the end of the extension case, from the connection side of the extension case toward the case end. , a supply passage passing through one side of the internal bearing support is provided, and a discharge passage is provided from the bearing support of the transfer drive shaft under the internal bearing support, passing through the internal bearing support and toward the end side of the case; A communication hole is bored above the guide rib for lubricating oil between the internal bearing support part and the bearing support part at the end of the case to communicate the supply passage with the top of the guide rib, and a communication hole is formed below the guide rib to intersect with the discharge passage. A communication hole is formed in the bearing support part at the end of the case, and passages are formed in the bearing support part at the end of the case to communicate with the upper and lower parts of the guide ribs. A lubricating structure of an extension case characterized by communicating with each other.