JPH0675853U - 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 9 fitted between the oil seal 9 and a dust seal 10 arranged so as to cover the outer circumference of the oil seal 9.
Then, the dust cover 8 fixed to the outer circumference of the sleeve 2 and covering the outer circumference of the dust seal 10 is provided.

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.

A dustproof device as shown in FIG. 3 is provided in the bearing portion that pivotally supports the pinion gear of the final reduction gear, and the companion flange 7 supported by a bearing (not shown) is connected to a propeller shaft (not shown). Then, the driving force is transmitted to the pinion gear. An oil seal 9 is fixed to the inner circumference of a cylindrical sleeve 2 fixed to a carrier case (not shown), and a lip 9a on the inner circumference of the oil seal 9 is slidably contacted with the outer circumference of the companion flange 7 and the inside of the sleeve 2 Prevent oil from leaking. Further, the outer side of the oil seal 9 is covered with a dust seal 10 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, the 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 9b of the oil seal 9 that slidably contacted with the inner periphery of the dust seal 10 was worn, shortening the life of the oil seal 9, and leaking the oil inside the sleeve 2.

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 portion 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, a cover fixed to the outer periphery of the sleeve and covering the outer periphery of the dust seal is provided. .

[0007]

[Action]

 Therefore, if muddy water is applied to the sleeve, the muddy water flows along the cover fixed to the outer circumference of the sleeve, so that the muddy water does not directly contact the dust seal and foreign matter such as muddy water or dust that enters the bearing is prevented. It 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 9 c of the oil seal 9 is fitted to the inner circumference of the end portion of the sleeve 2, and the lip 9 a formed at the end portion of the oil seal 9 is biased by the holding frame 90. The sliding contact is made with the outer circumference of the companion flange 7.

The outer side of the oil seal 9 is covered with a cylindrical portion 10 a of a dust seal 10 whose base end is fixed to the step portion 7 a of the companion flange 7. The dust seal 10 is formed by a plate-shaped member provided with a flange portion 10b bent toward the outer periphery at a predetermined position between the base end and the cylindrical portion 10a, and rotates integrally with the companion flange 7. A predetermined gap is provided between the end of the cylindrical portion 10a of the dust seal 10 and the oil seal 9, while a lip 9b protruding outward from the oil seal 9 is slidably contacted with the inner periphery of the dust seal 10 to form the gap. Prevent foreign substances from entering.

A dust cover 8 formed of a plate-like member and having a tubular shape is fitted to the outer periphery of the end portion of the sleeve 2. The dust cover 8 whose base end is fixed to the outer circumference of the sleeve 2 protrudes from the end of the sleeve 2 to the vicinity of the step 7a of the companion flange 7 beyond the flange 10b of the dust seal 10 and then toward the inner circumference, that is, The dust seal 10 is provided with a bent portion 8a which is bent, and a predetermined gap is provided between the end portion 8b of the bent portion 8a and the outer periphery of the dust seal 10.

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, when the carrier case 1 is covered with muddy water or the like, a part of the muddy water is transmitted along the outer circumferences of the carrier case 1 and the sleeve 2, but is bent from the end portion of the sleeve 2 along the outer circumference of the dust cover 8. It falls from the portion 8a to the outer periphery of the companion flange 7. Since the companion flange 7 is rotating together with the propeller shaft, the muddy water and the like adhering to the outer periphery is blown away by the centrifugal force, and foreign matter can be removed from the outer periphery of the companion flange 7.

Therefore, foreign matter such as muddy water can be prevented from entering through the gap between the cylindrical portion 10 a of the dust seal 10 and the oil seal 9, and the lip 9 b of the oil seal 9 slidingly contacting the dust seal 10 and the companion flange 7 are slidably contacted. The lip 9a can be prevented from being worn by sliding contact with a foreign substance, and it is possible to prevent oil leakage from the inside of the sleeve 2 due to wear of the oil seal 9.

On the other hand, when the carrier case 1 is covered with muddy water from the front of the vehicle, that is, from the bent portion 8 a side of the dust cover 8, from the gap between the end portion 8 b of the dust cover 8 and the outer periphery of the dust seal 10. Although part of the muddy water enters, the flange portion 10b of the dust seal 10 can prevent the intrusion, and the wear of the oil seal 9 can be prevented in the same manner as described above.

In the above embodiment, the end portion 8b of the dust cover 8 is projected at a predetermined position between the step portion 7a of the companion flange 7 and the flange portion 10b of the dust seal 10. May be projected to the outer periphery of the companion flange 7.

[0020]

[Effect of device]

 As described above, according to the present invention, since the dust seal is covered by the cover fixed to the outer circumference of the sleeve fitted to the carrier case, foreign matter such as muddy water may enter through the gap between the dust seal and the oil seal. It is possible to prevent the dust seal and the oil seal that is in sliding contact with the flange from being worn away due to the sliding contact with foreign matter, and it is possible to prevent oil leakage from the inside of the sleeve due to wear of the oil seal.

[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 the bearing portion.

FIG. 3 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 Dust cover 9 Oil seal 10 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, a cover fixed to the outer periphery of the sleeve and covering the outer periphery of the dust seal is provided. A dustproof device for a final reduction gear for a vehicle, which is characterized in that