JPS5850144Y2 - Oil sealing device for split casing - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an oil sealing device for a mating surface in a so-called shaped case, in which separately formed casing components are joined together and fastened together.

In the case of a casing that houses a transmission device, the case body is divided into parts at the shaft hole that supports the shaft in the casing, and these split case bodies are joined together and fastened to form the casing. For oil sealing, the conventional device uses a rubber seal C, which is integrally and continuously molded with a part a that seals the mating flat surfaces with oil and an annular part that seals the inner peripheral edge of the shaft hole with oil, as shown in Fig. 5. However, because this rubber seal has a complex three-dimensional configuration, it is difficult to handle during molding and assembly, resulting in extremely high overall costs and many practical disadvantages. be.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an oil sealing device with a simple structure that can reliably seal the mating surfaces of shaped casings while eliminating all the high cost disadvantages of conventional devices.

This will be explained below using specific examples shown in the drawings.

1 to 4 show an example of an embodiment of the oil seal device according to the present invention, and 1 and 1' in the figures indicate divided case bodies.

As is clear from FIGS. 2 and 3, these case bodies 1, 1' are divided into two parts in a direction parallel to the transmission shaft 2 etc. at the support part 3 that supports the transmission shaft 2 etc. The case bodies 1, 1' are formed by casting or the like, and corresponding fastener insertion holes 4 are formed at appropriate intervals in the peripheral edge of each case body.

Thus, the bearing fitting part 3a on the inside of the support part 3 holds the bearing 5 into which the shaft 2 is fitted, and the outer fitting part 3b of this part holds a lip in circumferential contact with the outer peripheral surface of the shaft 2. Attach the elastic annular sealing material 7 that holds the oil seal 6.

The outer diameter of the elastic annular sealing material 7 may be configured to fit with the fitting portion 3b with unevenness, as shown in the embodiment, or to fit in a straight fit (not shown). It is what you do.

Reference numeral 8 denotes a backing that is attached to the mating surfaces of the case bodies 1 and 1', and is formed by punching out of a suitable sealing material, and holes 9 are provided in the aforementioned fastener insertion holes 4, respectively.
..., and a punched hole 10 in which the outer shape of the elastic annular sealing material 7 fits is bored at a location corresponding to the fitting portion 3b of the support portion 3, and both sides of this hole are It is formed by leaving continuous parts 11at11b that are continuous.

Therefore, when assembling the case body 1, 1' into a casing that supports and accommodates the transmission shaft, etc., the transmission shaft 2
After fitting the bearings, rings 5, oil seals 6, elastic annular sealing material 7, etc. to the case bodies 1 and 1', and assembling other necessary components to each case body 1, 1', the mating surface of one case body is fitted. Then, the backing 8 is fitted while performing actions such as pasting, and then the bearing 5 and the sealing material 7 of the transmission shaft 2 in the above-mentioned state are attached to the support part 3 half of the case body.
If the other case bodies are overlapped and tightened with the fasteners inserted through the fastener insertion holes 4, the casing will be in a state where the device consisting of the transmission shaft 2, etc. is housed. When assembling, the continuous parts 11a and I on both sides of the hole 10 in the backing can be assembled.
Since lb is pressed by the transmission shaft 2 as shown in Fig. 3,
The hole edge corresponding to the outer periphery of the elastic annular seal material in the hole of the backing is drawn toward the outer periphery of the elastic annular seal and is strongly pressed against the outer periphery, so that the assembly is automatically ensured and strong. After both case bodies 1 and 1' are tightened and fixed with the fastener, the backing is kept in pressure contact with the backing in the above-mentioned state by its tightening holding force, so that the continuous portion 11a.

The sealed state can be maintained regardless of the presence or absence of 1lb.

As explained above, the present invention has a structure in which split case bodies 1 and 1' are formed such that the shaft hole into which the transmission shaft 2 is inserted is divided into two semicircular arc parts, and are joined together at the mating surfaces. In the embodiment case, a punched hole 10 is formed in a portion corresponding to the shaft hole of the flat backing 8 sandwiched between the mating surfaces of the split case bodies 1 and 1', and a transmission shaft is inserted into the punched hole 10. The elastic annular sealing material 7 fitted in the elastic annular sealing material 7 is made to fit together, and the outer peripheral part of the elastic annular sealing material and the edge of the punched hole along this part are
A continuous portion 11a on the heavy rain side is punched out using the transmission shaft 2.

Since the oil seal is made by pressing 1 lb, the outer periphery of the elastic annular sealing material fitted into the shaft hole and the hole edge along the outer periphery are connected to each other by the transmission shaft 2. 11a and 1lb can be brought into pressure contact and reliably sealed by pressing the parts 11a and 1lb, which can sometimes be done automatically when assembling the split cases together. Regardless, the area where the flat mating surface part and the shaft hole part are connected can be accurately sealed with oil, and the structure is significantly simpler than conventional equipment. This made it possible to simplify the work and reduce the overall cost.

[Brief explanation of the drawing]

The drawings show a specific example of the present invention. Fig. 1 is a partially cutaway cross-sectional view of a casing according to the device of the present invention, Fig. 2 is an enlarged cross-sectional view of the main part, and Fig. 3 is a cross-sectional view of the casing according to the present invention. 4 is a plan view of the main part of the backing, and FIG. 5 is a perspective explanatory view showing the conventional state of the sealing material. DESCRIPTION OF SYMBOLS 1...Case body, 1'...Case body, 2...Transmission shaft, 3...Support part, 7.
...Elastic annular sealing material, 8...Backing, 10...Hole, 11a, 11b...
Continuous part.

Claims (1)

[Scope of utility model registration request] The split case body 1, 1' is formed so that the shaft hole into which the transmission shaft 2 is inserted is divided into two semicircular arc parts, and the split case bodies 1 and 1' are joined together at the mating surfaces. body 1,1
A punched hole 10 is formed in a portion corresponding to the shaft hole of the flat backing 8 that is clamped between the mating surfaces of .
The elastic annular sealing material 7 fitted on the transmission shaft is fitted onto the transmission shaft 0, and the outer periphery of the elastic annular sealing material and the edge of the punched hole along this part are punched out using the transmission shaft 2 and the heavy rain side An oil sealing device for a shaped casing, characterized in that the continuous portions 11a and 11b of the casing are pressed against each other to seal the oil.