JPH0453489Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shaft sealing mechanism for a vehicle that prevents thermal deterioration due to frictional heat of an oil seal member provided in an air chamber between a transmission and a transfer.

[Conventional technology]

As a conventional shaft sealing mechanism for a vehicle, there is one shown in FIG. 3, for example. This vehicle shaft sealing mechanism has a pair of oil seal members 1 and 2 that independently seal a transmission mechanism T/M and a transfer mechanism T/F. /F is sealed between the air chambers 3 formed between them. Transmission mechanism T/
M and transfer mechanism T/F each have a normal configuration, so their explanation will be omitted here, but they have partition walls 4 and 5 between them and the air chamber 3, and between both partition walls 4 and 5, A drive shaft 6 on the transmission side and a drive shaft 7 on the transfer side are connected. The drive shafts 6 and 7 are rotationally supported by bearings 8 and 9, and are connected to the T/F built-in mechanism by the bulkheads 4 and 5 and the drive shaft 7 (the drive shaft 7 is connected to the T/F built-in mechanism by the main drive gear 10 integrated with the partition walls 4 and 5). The above-mentioned oil seals 1 and 2 are provided between the engine and the engine (which transmits power). An air vent/drain hole 11 is provided below the air chamber 3 for reasons to be described later.

FIG. 4 shows oil seal members 1 and 2 provided between the drive shaft 7 and the partition walls 4 and 5,
L-shaped inelastic members 12 and 13 made of metal, etc.
It is composed of an integrally molded body covered with elastic members 14 and 15 such as rubber, and has main lips 16 and 17 for oil stoppage in the part that contacts the drive shaft 7, and a dust lip 18 for stoppage of dust or muddy water. , 19, and the gutter spring 2 is connected from the outer periphery of the main lips 16, 17.
0,21.

Due to the configuration described above, the temperature of the transmission mechanism T/M and transfer mechanism T/F increases due to gear friction heat, oil stirring heat, etc., and the temperature of the air chamber 3 also increases accordingly. Since the air vent and water vent hole 11 is provided, an increase in the internal pressure of the air chamber 3 is prevented. On the other hand, even if muddy water or the like enters through the air vent/drain hole 11, the dust lips 18, 19 prevent it from moving toward the main lips 16, 17.
6 and 17 serve as an oil seal for the transmission mechanism T/M and the transfer mechanism T/F.

[Problem that the invention attempts to solve]

However, in such a shaft sealing mechanism for a vehicle, as the temperature of the transmission and transfer increases, the temperature of the air chamber between them also increases. In addition to being used in such a thermal environment, the main lip and dust lip of the oil seal are constantly in contact with rotating members, which generates heat, which may deteriorate the oil seal member. There is a problem in that oil leakage occurs due to this deterioration.

[Means for solving problems]

The present invention was developed in view of the above, and in order to prevent deterioration of the oil seal member due to heat generation, the contact between the oil seal member and the drive rotating member is made only with a single lip for the oil seal, and the transmission The present invention provides a shaft sealing mechanism for a vehicle, which is provided with a dustproof member that prevents the infiltration of muddy water and the like so as to straddle the ends of respective partition walls that are provided between the shaft sealing mechanism and the transfer mechanism.

That is, according to the vehicle shaft sealing mechanism of the present invention, the dust strip that was in contact with the rotating member is no longer necessary.
Instead, a dustproof member having, for example, a bellows mechanism is provided so as to span the transmission mechanism, the transfer mechanism, and the ends of the respective partition walls that partition the air chamber formed between the two mechanisms. The member prevents muddy water from entering into the oil seal member.

Hereinafter, the vehicle shaft sealing mechanism of the present invention will be explained in detail.

〔Example〕

1 and 2 show an embodiment of the present invention, in which a pair of oil seal members 1 and 2 are provided between partition walls 4 and 5 and a drive shaft 7, and the transmission mechanism T/M and transfer Mechanism T/F is independently oil sealed. The partition walls 4 and 5 have tapered portions 4a and 5a at their ends, and a dustproof member 30 is provided so as to span these tapered portions 4a and 5a. The dustproof member 30 is molded from an elastic material such as rubber, and includes an expandable bellows member 30a, leg portions 3b located at the tapered portions 4a and 5a, and is designed to provide elastic stiffness and a reinforcing effect. It has a thick end portion 30c. In this case, a concave-convex fitting portion may be provided at the interface between the leg portion 30b and one of the tapered portions 4a or 5a to increase the effect of fixing the dustproof member 30. The dustproof member 30 forms, together with the partition walls 4 and 5, a sealed chamber 31 surrounding the oil seals 1 and 2 and the drive shaft 7.

When assembling, after fitting one end of the dustproof member 30 to the tapered part 4a or 5a (if the above-mentioned uneven fitting part exists, that side), the transmission mechanism T/M and the transfer mechanism are assembled. At the same time as connecting the T/Fs, the other end of the dustproof member 30 may be fitted into the remaining tapered portion 4a or 5a. At this time, since the bellows portion 30a is provided in a somewhat contracted state and both end portions 30c are expanded to surround the oil seal members 1 and 2, the attachment of the dustproof member 30 is stable.

With the above configuration, the air vent/drain hole 1
Even if muddy water enters from the oil seal member 1, the dustproof member blocks the muddy water, so that the muddy water does not reach the contact surfaces between the oil seal members 1, 2 and the drive shaft 7. In addition, even if the transmission mechanism T/M and the transfer mechanism T/F generate heat due to gear friction heat, oil stirring heat, etc., the air/drain hole 11 adjusts the internal pressure, and the inside of the dustproof member 30 Bellows part 30
a elastically deforms and assists it. Furthermore, even if there is variation in the gap A between the partition walls 4 and 5, it can be absorbed by the elastic deformation of the bellows portion 30a. Naturally, since the dust strip is no longer needed, the number of frictional contact parts is reduced from four to two, and since the dust strip no longer generates heat, the amount of heat generated is reduced.

[Effect of idea]

As explained above, according to the shaft sealing mechanism for a vehicle of the present invention, the contact between the oil seal member and the drive rotating member is made only through a single lip for the oil seal, and there is no contact between the oil seal member and the drive rotating member, and there is no contact between the oil seal member and the drive rotating member. A dustproof member that prevents muddy water, etc. from entering is provided so as to straddle the end of each partition wall provided between the mechanism and the oil seal member, thereby preventing the oil seal member from deteriorating due to heat generation while preventing muddy water, etc. from entering. .

[Brief explanation of the drawing]

FIGS. 1 and 2 show an embodiment of the present invention, with FIG. 1 being an explanatory view of the whole, and FIG. 2 being an enlarged view of the main parts. 3 and 4 show a conventional shaft sealing mechanism for a vehicle, with FIG. 3 being an explanatory view of the whole, and FIG. 4 being an enlarged view of the main parts. Explanation of symbols, 1, 2...Oil seal member, 3
... Air chamber, 4, 5 ... Bulkhead, 6, 7 ... Drive shaft, 8, 9 ... Bearing, 10 ... Main drive gear, 11 ... Air vent and water drain hole, 1
2, 13... Inelastic member, 14, 15... Elastic member, 16, 17... Oil seal lip, 2
0, 21... Gutter spring, 30... Dust-proof member, 31... Sealed chamber.

Claims (1)

[Claims for Utility Model Registration] (1) Provided between the transmission mechanism and the transfer mechanism, partition walls are provided on the transmission mechanism side and the transfer mechanism side, respectively, and an air chamber is provided between them. In the shaft sealing mechanism for a vehicle, the shaft sealing mechanism for a vehicle has an oil seal between each of the partition walls and the drive rotating member, the lip part being in contact with the outer periphery of the drive rotation member by a radial bias, and a pair of oil seal members that seal between the drive rotating member and the drive rotating member; and a pair of oil seal members that are provided astride between the respective partition walls, and a sealed chamber surrounding the drive rotation member and the oil seal is provided between the respective partition walls. A shaft sealing mechanism for a vehicle, comprising a dustproof member formed to isolate the drive rotation member and the oil seal from the air chamber and prevent entry of muddy water and the like. (2) The shaft sealing mechanism for a vehicle according to claim 1, wherein the dustproof member is a bellows mechanism having a plurality of coaxial circumferential folds.