JPH0678666U - Dustproof device for vehicle final reducer - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent foreign matter such as muddy water and dust from entering and reduce wear of the oil seal. [Structure] A pinion gear 4 connected to a propeller shaft end via a companion flange 7, a sleeve 2 rotatably supporting the pinion gear 4 via a roller bearing 3, an outer circumference of the companion flange 7 and an inner circumference of the sleeve 2. An oil seal 8 fitted between the oil seal 8 and a dust seal 9 arranged so as to cover the outer circumference of the oil seal 8.
And the flange portion 8 in which the outer periphery of the oil seal 8 is projected in the radial direction of the companion flange from the end portion of the sleeve 8.
to form d.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dustproof device for a final reduction gear for a vehicle, and more particularly to an improvement in a dustproof structure of a bearing portion that pivotally supports a pinion gear coupled to a propeller shaft.

[0002]

[Prior art]

 The vehicle is provided with a final reduction gear that transmits the driving force from the transmission etc. to the axle. The final reduction gear is disclosed in Japanese Utility Model Laid-Open No. 1-144428 and Japanese Utility Model Laid-Open No. 1-122326. It has been known.

These bearings that support the pinion gears of the final reduction gear are provided with a dustproof device as shown in FIG. 4, and the companion flange 7 supported by a bearing (not shown) is connected to a propeller shaft (not shown). Drive force to the pinion gear. An oil seal 8 is fixed to the inner circumference of a cylindrical sleeve 2 fixed to a carrier case (not shown), and a lip 8a on the inner circumference of the oil seal 8 is brought into sliding contact with the outer circumference of the companion flange 7 so that the inside of the sleeve 2 can be prevented. Prevent oil from leaking. Further, the outside of the oil seal 8 is covered with a dust seal 9 fitted to the outer periphery of the companion flange 7 to prevent intrusion of muddy water and dust from the outside.

[0004]

[Problems to be solved by the device]

 However, in the conventional dust reducer for the final reduction gear, when muddy water or the like is applied to the carrier case, muddy water flows along the outer circumference of the sleeve 2 as shown by the arrow in FIG. In some cases, muddy water entered through the gap, the lip 8b of the oil seal 8 that slidably contacted with the inner circumference of the dust seal 9 was worn, shortening the life, and the oil inside the sleeve 2 leaked.

Therefore, an object of the present invention is to provide a dustproof device for a vehicle final reduction gear, which can prevent foreign matter such as muddy water and dust from entering and reduce wear of an oil seal.

[0006]

[Means for Solving the Problems]

 According to the present invention, a pinion gear connected to an end of a propeller shaft via a flange, a sleeve rotatably supporting the pinion gear via a bearing, and a sleeve fitted between an outer circumference of the flange and an inner circumference of the sleeve. In a dustproof device for a vehicle final reduction gear equipped with a mounted oil seal and a dust seal arranged so as to cover the outer periphery of the oil seal, the outer periphery of the oil seal is extended from the end of the sleeve to the radius of the flange. Project in the direction.

[0007]

[Action]

 Therefore, if muddy water is applied to the sleeve, the muddy water will be dammed from the end of the sleeve to the outer circumference of the oil seal that protrudes in the radial direction of the flange, then will flow down from the sleeve along the outer circumference of the oil seal, and the muddy water will become dust seal. Since it does not enter the gap between the oil seal and the oil seal, foreign matter such as muddy water or dust that enters the bearing can be reduced.

[0008]

【Example】

 An embodiment of the present invention is shown in FIGS.

In FIG. 1, a sleeve 2 formed of a tubular member is fitted to the inner circumference of the end of a carrier case 1 arranged on the rear axle of a vehicle, and the retainer 30 is fitted to the inner circumference of the sleeve 2. The roller bearing 3 is held via the roller bearing 3, and the shaft portion 4a of the pinion gear 4 is rotatably supported on the inner circumference of the roller bearing 3.

A ring gear 5 fixed to the outer circumference of a differential case 6 accommodating a differential device (not shown) meshes with a pinion gear 4, while a companion flange 7 spline-coupled to the outer circumference of a shaft portion 4a of the pinion gear 4 is connected to a propeller (not shown). It is connected to the end of the shaft and transmits the driving force from the transmission to the axle (not shown).

As shown in FIG. 2, the cylindrical portion 8 c of the oil seal 8 is fitted on the inner circumference of the end portion of the sleeve 2, and the lip 8 a formed on the inner end portion of the oil seal 8 is urged by the holding frame 80. Then, while slidingly contacting the outer periphery of the companion flange 7 to retain the lubricating oil inside the sleeve 2, the outer periphery of the oil seal 8 forms a flange portion 8d protruding from the end portion of the sleeve 2 in the radial direction of the companion flange 7. Then, the end of the flange portion 8d projects to a predetermined height from the tapered notch 2a provided at the end of the sleeve 2.

The outer side of the oil seal 8 is covered with a cylindrical portion 9 a of a dust seal 9 whose base end is fixed to the step portion 7 a of the companion flange 7. The dust seal 9 is formed by a plate-shaped member provided with a flange portion 9b bent toward the outer periphery at a predetermined position between the base end and the cylindrical portion 9a, and rotates together with the companion flange 7. A predetermined gap is provided between the end of the cylindrical portion 9a of the dust seal 9 and the oil seal 8, while the lip 8b protruding outward from the oil seal 8 is in sliding contact with the inner circumference of the dust seal 9. To prevent foreign matter from entering through the gap.

With the above-mentioned configuration, the operation will be described.

The pinion gear 4 supported by the roller bearing 3 drives the ring gear 5 in accordance with the rotation of the companion flange 7 to drive an operating device (not shown) of the differential case 6.

At this time, if the carrier case 1 is covered with muddy water or the like, a part of the muddy water is transmitted along the outer periphery of the carrier case 1 and the sleeve 2, but the muddy water flowing to the end of the sleeve 2 is absorbed by the flange portion of the oil seal 8. Since it is dammed by 8d, the muddy water drops from the sleeve 2 after flowing along the flange portion 8d and the cutout portion 2a of the sleeve 2.

Therefore, even if muddy water or the like is splashed on the carrier case 1 or the sleeve 2, it is possible to prevent foreign matter such as muddy water from entering through the gap between the cylindrical portion 9 a of the dust seal 9 and the oil seal 8, and to prevent the dust seal 9 from entering. The lip 8b of the oil seal 8 which is in sliding contact and the lip 8a which is in sliding contact with the companion flange 7 can prevent wear due to sliding contact with foreign matter, and prevent oil leakage from the inside of the sleeve 2 due to wear of the oil seal 8. It becomes possible.

FIG. 3 shows another embodiment, in which a liquid gasket 8 1 is provided between the flange portion 8 d of the oil seal 8 and the cutout portion 2 a provided at the end portion of the sleeve 2 in the first embodiment. The liquid gasket 81 is applied and protrudes from the flange portion 8d toward the outer circumference of the sleeve 2, that is, in the radial direction of the companion flange 7, and the other configurations are the same as those in the first embodiment.

The liquid gasket 81 applied between the cutout portion 2a of the sleeve 2 and the flange portion 8d of the oil seal 8 stops the muddy water and the like on the sleeve 2 and keeps the same as in the first embodiment. It is possible to prevent the foreign matter from entering and to maintain the durability of the oil seal 8.

Although the notch 2a is formed at the end of the sleeve 2 in the above-mentioned embodiment, the notch 2a is formed if the height of the flange 8d of the oil seal 8 protruding from the end of the sleeve 2 is increased. The part 2a may not be formed.

[0020]

[Effect of device]

 As described above, according to the present invention, since the outer periphery of the oil seal is projected from the end portion of the sleeve, muddy water and the like splashed on the sleeve flows along the outer periphery of the oil seal, so that it enters through the gap between the dust seal and the oil seal. It is possible to reduce foreign matter such as muddy water, which reduces the wear of the dust seal and the oil seal that is in sliding contact with the flange, and prevents oil leakage from the inside of the sleeve due to wear of the oil seal. Becomes

[Brief description of drawings]

FIG. 1 is a sectional view of a final reduction gear showing an embodiment of the present invention.

FIG. 2 is also an enlarged view of an oil seal portion.

FIG. 3 is an enlarged view of an oil seal portion showing another embodiment.

FIG. 4 is an enlarged view of a bearing portion showing a conventional example.

[Explanation of symbols]

 2 Sleeve 3 Roller bearing 4 Pinion gear 7 Companion flange 8 Oil seal 8d Flange part 9 Dust seal

Claims (1)

[Scope of utility model registration request] 1. A pinion gear connected to an end portion of a propeller shaft via a flange, a sleeve rotatably supporting the pinion gear via a bearing, and a fit between an outer circumference of the flange and an inner circumference of the sleeve. In a dustproof device for a vehicle final reduction gear, comprising a mounted oil seal and a dust seal arranged so as to cover the outer periphery of the oil seal, the outer periphery of the oil seal is arranged in a radial direction of the flange from an end of the sleeve. A dustproof device for a final reduction gear for a vehicle, characterized in that it is projected to the inside.