KR20050036500A - Seal for hub unit bearing - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal for a hub unit bearing of a motor vehicle, and more particularly, consisting of outer and inner irons that are in close contact with outer and inner ring portions of a bearing, and a sealing that performs a sealing action in a space between the outer and inner irons. In the seal for a hub unit bearing, a bent portion is formed in the inner direction of the seal so that the foreign material blocking portion of the seal is in contact with the outer circumferential side of the inner iron, and the auxiliary blocking portion of the sealing is in contact with the inside of the bent portion, and the foreign matter is accumulated. By providing a triangular chamber to prevent, the present invention provides an effect that the durability of the seal is improved to improve the lubrication performance of the hub unit bearing.

Description

Seal for Hub unit bearing

The present invention relates to a seal for a hub unit bearing of a vehicle (SEAL), in particular, to prevent the phenomenon of foreign matter penetrates into the inner space of the seal through the outer inlet portion of the seal and to minimize the residue of foreign matter to eliminate rust generation The present invention relates to a seal for a hub unit bearing so that the lubrication performance of the hub unit bearing can be improved.

In general, the hub unit bearing is installed around the shaft to support rotation of the shaft and to support the shaft to the frame.

As shown in FIG. 1, the hub unit bearing includes an outer ring portion 1 fixed to a frame, an inner ring portion 3 positioned inside the outer ring portion 1 and a shaft inserted therein, and A plurality of balls (5) inserted between the outer ring portion (1) and the inner ring portion (3) for rolling contact between the outer ring portion (1) and the inner ring portion (3), and the outer ring portion (1) and the inner ring portion (3) It consists of a seal 10 which blocks the space between the outer ring part 1 and the inner ring part 3 from the outside so that the lubrication action by the lubricating oil filled in between is maintained.

The hub unit bearing is configured to support rotation of the shaft while the relative motion between the outer ring portion 1 and the inner ring portion 3 is made by the rolling contact of the ball 5.

In particular, the seal 10 is installed at both ends of the space formed between the outer ring portion 1 and the inner ring portion 3, the outer ring 11 in the form of a ring in close contact with the outer ring portion 1 and the inner ring It is inserted into the space between the outer iron 11 and the inner iron 13, and the ring-shaped inner iron 13, which is in close contact with the portion 3 to form a predetermined space between the outer iron 11 and the sealing action. Consists of a rubber seal 15 to be performed.

In addition, the seal 15 has a seating gap 15a in which the outer iron 11 is seated in a portion in close contact with the outer iron 11 to be coupled to and supported by the outer iron 11.

In addition, the seal 15 is provided with a lubricating oil blocking portion 15b that blocks the inner inlet portion IL of the seal 10 to prevent the lubricant inside the hub unit bearing from flowing out of the hub unit bearing by heat generation. The foreign matter blocking portion 15c is formed outside.

The seal 10 configured as described above functions to keep the hub bearing unit operating normally by minimizing rolling resistance of the ball 5 by maintaining an internal lubrication state of the hub unit bearing.

However, in the conventional hub unit bearing seal as described above, the foreign matter 17 introduced through the outer inlet portion OL is accumulated in the inner space between the outer inlet portion OL and the foreign matter blocking portion 15b. The remaining foreign matter 17 has a problem in that the lubricating performance of the hub unit bearing is deteriorated by melting the rubber seal 15 and the like.

On the other hand, Figure 2 shows a hub unit bearing seal disclosed in Patent Publication No. '2001-66684', a hub unit bearing seal proposed to improve the conventional problems as described above.

In the seal for the hub unit bearing, the foreign matter blocking portion 25a is additionally added to the outer inlet portion OL together with the existing foreign matter blocking portion 25c in the seal 25 between the outer convex 21 and the inner iron 23. It is comprised so that foreign matter may penetrate into an inside of a chamber from the exterior.

However, even when the seal for the hub unit bearing disclosed as described above is infiltrated into the seal, the portion “A” between the outer circumferential portion 23a and the foreign matter blocking portion 25c of the inner convex 23 as shown in FIG. 2. And, foreign matter is accumulated in the "B" portion between the foreign matter blocking portion 25c and the lubricating oil blocking portion 25b, and the accumulated foreign matters are not easily discharged out of the thread, causing the seal to corrode, and so on. .

The present invention has been made to solve the above problems, by preventing the foreign matter penetrates into the inner space through the outer inlet portion of the seal as well as configured to easily discharge the foreign matter introduced into the interior of the seal It is an object of the present invention to provide a seal for a hub unit bearing which improves the durability of the seal so that the lubricating performance of the hub bearing is improved.

Hub unit bearing seal according to the present invention for realizing the above object is a hub consisting of an outer iron and inner iron which is in close contact with the outer ring and the inner ring of the bearing, respectively, and a sealing to perform a sealing action in the space between the outer iron and inner iron In the unit bearing seal, a bent portion is formed in the inner direction of the seal so that the foreign material blocking portion of the seal is contacted on the outer circumferential side of the inner wire, and the auxiliary blocking portion of the sealing is prevented from accumulating foreign matters inside the bent portion. Characterized in that the triangular chamber is provided to be.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

3 is a cross-sectional view showing a seal for a hub unit bearing according to the present invention, Figure 4 is a state diagram showing the foreign matter blocking portion of the seal for the hub unit bearing according to the present invention, Figure 5 is a seal for the hub unit bearing according to the present invention 6 is an operation state diagram of the triangular chamber, and FIG. 6 is an operation state diagram of the triangular chamber and the auxiliary blocking unit of the hub unit bearing seal according to the present invention.

As shown in FIG. 3, the seal for hub unit bearing according to the present invention has a ring-shaped outer conduit 51 closely attached to the outer ring portion of the hub unit bearing, and the outer convex portion 51 closely attached to the inner ring portion of the hub unit bearing. Ring-shaped inner steel 53 forming a predetermined space therebetween, and a rubber material inserted into the space between the outer steel 51 and inner steel 53 to perform a sealing action inside the hub unit bearing. It consists of a sealing 60.

The sealing 60 has an insertion gap 60a in which a part of the end of the outer iron 51 is inserted into a portion in close contact with the outer iron 51 and is tightly coupled to the outer iron 51.

The seal 60 is formed with lubricating oil blocking portions 61 and 62 in contact with the inner conduit 53 to block the inner inlet portion IL of the seal.

The lubricating oil blocking unit 61 and 62 prevents the lubricating oil inside the hub unit bearing from flowing out of the hub unit bearing by heat generation, thereby smoothly maintaining the lubrication state inside the hub unit bearing, thereby preventing the lubricating oil from flowing inside the hub unit bearing. It will function to minimize the resistance.

 In addition, the lubrication of the seal (60) between the blocking portion (61) 62 and the foreign matter blocking portion (64, 65) is formed so that the end is projected toward the inner steel 53 so that the end contact with the inner steel (53) side The blocking portion 63 is formed. The auxiliary blocking portion 63 is positioned between the lubricating oil blocking portions 61 and 62 and the foreign matter blocking portions 64 and 65 to form a triple film to serve to enhance the basic function of the seal.

Particularly, in the present invention, a bent portion 53a is formed at an inner circumferential side of the inner convex portion 53 so that the foreign material blocking portions 64 and 65 of the seal 60 come into contact with each other, and the bent portion ( The inside of the 53a) is provided with a triangular chamber 70 so that the auxiliary blocking portion 63 of the seal 60 is in contact with each other and to prevent foreign matter from accumulating.

The bent portion 53a is bent toward the inner space of the yarn at the end forming the outer inlet portion OL of the yarn.

The foreign material blocking portion 64, 65 is composed of a plurality (two in the drawing of the present embodiment) is configured to contact the outside of the bent portion of the inner convex 53, a plurality of each end portion from the outside of the hub unit bearing It is formed to be inclined side by side toward the outside in order to more effectively prevent foreign matter penetration.

Therefore, the foreign matter blocking unit 64, 65 prevents the foreign matter entering the inside of the room through the outer inlet portion OL of the seal in a double layer structure, and the foreign matter exiting the outside of the seal as shown in FIG. By being relatively thinner, it can be easily opened by rotation and easily discharge foreign substances to the outside.

Next, the triangular chamber 70 is made of a rubber material whose cutting surface is triangular, it is provided inside the bent portion (53a) of the inner duct 53.

Since the triangular chamber 70 has a constant weight, as shown in FIG. 5, the bent portion 53a is deformed outward by the rotational force of the inner convex 53 to closely contact the foreign material blocking portions 64 and 65. do. When the bearing and the inner steel 53 do not rotate, the bent portion 53a is returned to its original state by elasticity.

And at least one of the triangular chamber 70 and the auxiliary blocking unit 63 is provided with a metal member to reduce the mutual frictional resistance, in the embodiment of the present invention, the metal member 72 is a triangular chamber 70 ) Is provided.

The triangular chamber 70 is formed of a recess 71 in which a portion in which the metal member 72 is installed, which is a portion in which the auxiliary blocking portion 63 is in contact, is recessed.

The metal member 72 has a concave groove shape in which a portion where the auxiliary blocking portion 63 contacts is formed in a crescent shape.

Therefore, as shown in FIG. 6, even when the auxiliary blocking portion 63 and the triangular chamber 70 of the seal are deformed when the bearing is rotated, a gap does not occur, and a metal member 72 is provided to contact the metal component with the rubber component. The frictional resistance can be reduced.

On the other hand, the lubricating oil blocking portion of the seal 60 from the inside of the bearing to the first lubricating oil blocking portion 61 in contact with the inner steel 53 and the second lubricating oil blocking portion 62 in contact with the triangular chamber 70. At least one side of the triangular chamber 70 and the second lubricating oil blocking part 62 is provided with a metal member 74 to reduce mutual frictional resistance.

Here, the metal member 74 is provided in the convex part of the said triangular chamber 70, and has a convex structure toward the said 2nd lubricating oil cut-off part 62. FIG.

 Meanwhile, the sealing 60 is installed in close contact with the inner conduit 53 instead of the outer conduit 51. It may be formed to protrude toward the outer convex 51.

Hub unit bearing seal according to the present invention configured and acted as described above is provided with a plurality of foreign matter blocking portion to easily prevent foreign matter from entering into the chamber, provided with a triangular chamber in the inner iron to prevent foreign matter introduced into the chamber. Since it is configured to be easily discharged out of the seal, the endurance life of the seal is improved, thereby improving the lubrication performance of the hub unit bearing.

1 is a cross-sectional view showing a hub unit bearing using a seal for a bearing of the prior art,

2 is a cross-sectional view showing a seal for a hub unit bearing disclosed in Patent Publication No. '2001-66684';

3 is a cross-sectional view showing a seal for a hub unit bearing according to the present invention;

Figure 4 is a state of foreign matter blocking portion of the seal for the hub unit bearing according to the present invention,

5 is a triangular chamber action state diagram of a seal for a hub unit bearing according to the present invention,

6 is an operational state diagram of the triangular chamber and the auxiliary blocking unit of the hub unit bearing seal according to the present invention.

<Explanation of symbols for the main parts of the drawings>

51: outside iron 53: inside iron

53a: bend 60: sealing

61, 62: lubricating oil block 63: auxiliary block

64, 65: foreign material blocking part 70: triangular chamber

71: groove 72, 74: metal member

Claims (12)

In a seal for a hub unit bearing composed of outer and inner irons which are in close contact with outer and inner ring portions of a bearing, and a seal which performs a sealing action in a space between the outer and inner irons, The outer circumferential side of the inner iron is formed with a bent portion in the inner direction of the seal so that the foreign matter blocking portion of the seal, The inside of the bent portion is a hub unit bearing seal, characterized in that the triangular chamber is provided so as to contact the auxiliary blocking portion of the seal and prevent the accumulation of foreign matter. The method of claim 1, Seals for hub unit bearing, characterized in that the foreign material blocking portion is made up of a plurality of contacts to the bent portion of the inner steel. The method of claim 2, Sealing the hub unit bearing, characterized in that the foreign material blocking portion is formed to be inclined toward the outside direction side by side end. The method of claim 1, The triangular chamber is a seal for a hub unit bearing, characterized in that made of a rubber material. The method of claim 4, wherein At least one side of the triangular chamber and the auxiliary blocking portion is a hub unit bearing seal, characterized in that the metal member is provided to reduce the mutual frictional resistance. The method of claim 5, wherein The metal member is a seal for a hub unit bearing, characterized in that provided in the triangular chamber. The method of claim 5, wherein The metal member is a seal for a hub unit bearing, characterized in that the portion in contact with the auxiliary blocking portion is formed in a concave groove shape. The method of claim 7, wherein Seal for hub unit bearing, characterized in that the metal member is formed in a crescent shape. The method of claim 1, Seal portion for the hub unit bearing, characterized in that the portion in the triangular chamber contact the auxiliary blocking portion is made of a concave groove. The method of claim 1, The seal is formed with a first lubricating oil blocking portion in contact with the inner iron from the inside of the bearing, and a second lubricating oil blocking portion in contact with the triangular chamber, At least one side of the triangular chamber and the second lubricating oil blocking portion is a hub unit bearing seal, characterized in that the metal member is provided to reduce the mutual frictional resistance. The method of claim 10, The metal member is a seal for a hub unit bearing, characterized in that provided in the triangular chamber. The method of claim 11, And said metal member has a convex structure toward said second lubricating oil blocking portion.