Low-torque hub bearing

Abstract

The utility model provides a low moment hub bearing, including flange outer ring, flange inner ring and rolling element, flange inner ring includes flange portion, also includes first sealing element and second sealing element, the first sealing element is sleeved inside flange outer ring, the first sealing element includes extension portion, and the second sealing element includes the extension portion. The extension part extends towards the flange inner ring, the flange inner ring is sleeved with the second sealing piece, the second sealing piece comprises a first lip part and a plurality of second lip parts, the first lip part elastically abuts against the first sealing piece, and the second lip part elastically abuts against the second sealing piece. And the plurality of second lip parts extend towards the extension part and are arranged at intervals with the extension part. Aiming at the defects in the prior art, the utility model provides the low-torque hub bearing capable of reducing the rotating torque on the basis of ensuring the sealing effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to bearing field especially a low torque wheel hub bearing. BACKGROUND

[0002] Bearing is an important component for mechanical body rotation support, and bearing has derived many kinds with development, and wheel hub bearing is one kind among them, wheel hub bearing is integrated with oil seal, wheel hub and other components together on the basis of basic rotation support to form a whole unit, and installation is more convenient, and better sealing and higher precision are provided, and wheel hub bearing is one of key components of automobile, and wheel hub bearing usually comprises flange inner ring, flange outer ring, rolling body and sealing ring, and the rolling body is accommodated in the raceway formed between the flange inner ring and the flange outer ring, and the rolling body rolls in the raceway by utilizing the circular surface of the rolling body, to provide rotation support, but the wheel hub bearing of the prior art, in order to ensure the sealing effect, the sealing ring often adopts the structure of multi-lip sealing, which also makes the contact lip too much, and the rotation torque generated in the rotating process is very large, and the demand of low torque of the existing new energy automobile cannot be met. SUMMARY

[0003] In view of the defects of the prior art, the utility model provides a low torque wheel hub bearing which can reduce rotation torque on the basis of ensuring sealing effect.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a low torque wheel hub bearing, which comprises a flange outer ring, a flange inner ring and a rolling body, the flange inner ring comprises a flange part, and comprises a first sealing element and a second sealing element, the first sealing element is sleeved on the inner side of the flange outer ring, the first sealing element comprises an extension part, the extension part is arranged to extend towards the flange inner ring, the second sealing element is sleeved on the flange inner ring, the second sealing element comprises a first lip part and a plurality of second lip parts, the first lip part is elastically abutted on the first sealing element, and the plurality of second lip parts extend towards the extension part and are arranged to be spaced apart from the extension part.

[0005] The advantages of the above technical scheme are that the extension part is arranged to extend towards the flange inner ring and is sleeved on the inner side of the flange outer ring, forming a basic blocking effect, at the same time, the plurality of second lip parts extend towards the extension part and are arranged to be spaced apart from the extension part, which can form a labyrinth seal, utilize the blocking effect of air layer, increase the path length and difficulty of impurities entering the bearing, and further strengthen the sealing capacity, finally, the first lip part is elastically abutted on the first sealing element, forming a tight contact sealing area, further preventing impurities from invading, ensuring the sealing effect, and on this basis, only the first lip part is elastically abutted on the first sealing element, adopting contact type sealing, which can effectively reduce the rotation torque and better meet the demand of low torque.

[0006] The utility model discloses further can set up: the extension part includes the oblique section that extends to the direction of rolling body, and the length of second lip portion gradually small setting is corresponding to the oblique section.

[0007] Through further setting, the shape of extension part is changed by the setting of oblique section, so that the space between extension part and second lip portion forms an irregular labyrinth structure, when external impurities try to enter the bearing, need along the tortuous path between the oblique section and the gradually smaller second lip portion, this greatly increases the difficulty of impurities to enter, prolongs the penetration path of impurities, thereby more effectively blocks the impurities, enhances the sealing effect.

[0008] The utility model discloses further can set up: the extension part includes the bending section that connects in the end of oblique section, and the end of bending section and second sealing piece are gap cooperation.

[0009] Through further setting, the setting of bending section is equivalent to increasing an additional defense line in the sealing structure, before external impurities enter the labyrinth structure between oblique section and second lip portion, still need to cross the gap between bending section and second sealing piece first, further prevent the invasion of impurities, provide more reliable sealing protection for bearing.

[0010] The utility model discloses further can set up: first lip portion is elastically swinged and set, and the end of first lip portion is in interference and is butt joint on first sealing piece.

[0011] Through further setting, the end of first lip portion is in interference and is butt joint on first sealing piece, so that under normal working condition, there is certain interference between first lip portion and first sealing piece, and the larger sealing pressure formed by this interference butt joint can effectively fill the possible tiny gap, prevent external medium from entering the bearing through these gaps, thereby improve the sealing effect, guarantee the clean and lubrication environment in bearing.

[0012] The utility model discloses further can set up: the flange of first sealing piece towards the inner ring of flange is provided with a plurality of water retaining beads in the position, and a plurality of water retaining beads extend radially, and water retaining bead is gradually small setting towards the direction of far away from the inner ring of flange.

[0013] Through further setting, the setting of water retaining bead increases the area and complexity of the contact of sealing piece and water, when water contacts second sealing piece, water retaining bead can effectively block the direct penetration of water, so that water forms accumulation between the beads, prolongs the penetration path of water, and in the process of bearing operation, still can throw water through water retaining bead, guarantee the effect of sealing.

[0014] The utility model discloses further can set up: the flange inner ring includes the radial extension support arm, the flange outer ring includes the ring groove, support arm extends to the ring groove and forms the clearance fit between the ring groove inner wall.

[0015] Through further setting, through setting support arm and ring groove on flange inner ring and flange outer ring respectively, and letting support wall extend to the ring groove and form clearance fit with the ring groove inner wall, can further enhance the effect of sealing.

[0016] The utility model discloses further can set up: support arm include the first contact surface in the end, the ring groove includes the second contact surface, the first contact surface and the second contact surface all are inclined setting, and the clearance fit between first contact surface and second contact surface.

[0017] Through further setting, through setting first contact surface on the end of support arm, setting second contact surface on the ring groove, and letting both be inclined setting and clearance fit, when bearing is impacted, that is, when the larger axial force, the relative inclination of flange outer ring and flange inner ring occurs, the clearance of both will disappear, and support arm and flange outer ring form abutment contact, play the effect of sharing part of the pressure of rolling body, further reduce the contact stress that raceway bears, reduce the formation of impact pit, reduce the occurrence of impact abnormal sound. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structural schematic diagram of the utility model embodiment;

[0019] Figure 2 It is the utility model embodiment Figure 1 The enlarged view of part a;

[0020] Figure 3 It is the utility model embodiment Figure 1 The enlarged view of part b;

[0021] Wherein: flange outer ring 1;Ring groove 11;Second contact surface 111;Flange inner ring 2;Flange part 21;Support arm 22;First contact surface 221;Rolling body 3;First sealing element 4;Extension 41;Inclined section 411;Bent section 412;Water baffle convex rib 42;Second sealing element 5;First lip 51;Second lip 52. DETAILED DESCRIPTION

[0022] The utility model discloses a low torque wheel hub bearing's implementation such as Figures 1-3As shown: including flange outer ring 1, flange inner ring 2 and rolling body 3, the flange inner ring 2 includes flange 21, and further comprising a first seal 4 and a second seal 5, the first seal 4 is sleeved on the inner side of the flange outer ring 1, the first seal 4 includes an extension 41, the extension 41 is arranged in the direction of the flange inner ring 2, the second seal 5 is sleeved on the flange inner ring 2, the second seal 5 includes a first lip 51 and a plurality of second lips 52, the first lip 51 is elastically abutted on the first seal 4, and the plurality of second lips 52 are arranged in the direction of the extension 41 and are spaced apart from the extension 41.

[0023] The extension 41 includes an inclined section 411 extending in the direction of the rolling body 3, and the length of the plurality of second lips 52 is gradually reduced in the direction of the inclined section 411.

[0024] The extension 41 includes a bending section 412 connected to the end of the inclined section 411, and the end of the bending section 412 is gap-fitted with the second seal 5.

[0025] The first lip 51 is elastically swingable, and the end of the first lip 51 is interference-abutted on the first seal 4.

[0026] The first seal 41 is provided with a plurality of water-blocking ribs 42 at the position of the flange 21 of the flange inner ring 2, and the plurality of water-blocking ribs 42 extend radially, and the water-blocking ribs 42 are gradually reduced in the direction away from the flange inner ring 2.

[0027] The flange inner ring 2 includes a radially extending support arm 22, and the flange outer ring 1 includes a ring groove 11, the support arm 22 extends into the ring groove 11 and is gap-fitted with the inner wall of the ring groove 11.

[0028] The support arm 22 includes a first contact surface 221 at the end, the ring groove 11 includes a second contact surface 111, the first contact surface 221 and the second contact surface 111 are both inclined, and the first contact surface 221 and the second contact surface 111 are gap-fitted.

[0029] The above examples are only one of the preferred specific examples of the present application, and the usual changes and replacements made by those skilled in the art within the scope of the technical scheme of the present application are all included in the protection scope of the present application.

Claims

1. A low moment hub bearing comprising a flanged outer race, a flanged inner race, and rolling elements, said flanged inner race comprising a flange portion, characterized in that: The first seal is sleeved on the inner side of the flange outer ring, and the first seal comprises an extension part extending towards the flange inner ring, and the second seal is sleeved on the flange inner ring, and the second seal comprises a first lip part and a plurality of second lip parts, the first lip part elastically abuts against the first seal, and the plurality of second lip parts extend towards the extension part and are spaced apart from the extension part.

2. The low moment hub bearing of claim 1, wherein: The extension part comprises an inclined section extending towards the rolling body, and the lengths of the plurality of second lip parts gradually decrease corresponding to the inclined section.

3. The low moment hub bearing of claim 2, wherein: The extension part comprises a bent section connected to the end of the inclined section, and the end of the bent section is gap-fitted with the second seal.

4. Low torque hub bearing according to claim 1 or 2 or 3, characterized in that: The first lip part is elastically swingable, and the end of the first lip part is in interference abutment with the first seal.

5. Low torque hub bearing according to claim 1 or 2 or 3, characterized in that: The first seal is provided with a plurality of water-blocking ribs at the position of the flange part of the flange inner ring, the plurality of water-blocking ribs extend radially, and the water-blocking ribs gradually decrease away from the flange inner ring.

6. The low moment hub bearing of claim 2, wherein: The flange inner ring comprises a radially extending support arm, and the flange outer ring comprises a ring groove, the support arm extends into the ring groove and is gap-fitted with the inner wall of the ring groove.

7. The low moment hub bearing of claim 6, wherein: The support arm comprises a first contact surface at the end, the ring groove comprises a second contact surface, and the first contact surface and the second contact surface are both inclined, and the first contact surface and the second contact surface are gap-fitted.

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