阅读说明：本技术 一种导流型高密封低转矩密封结构的轮毂轴承单元 (Hub bearing unit of diversion type high-sealing low-torque sealing structure ) 是由 张高峰 黄德杰 张侠 于 2020-04-24 设计创作，主要内容包括：本发明公开了一种导流型高密封低转矩密封结构的轮毂轴承单元,主要包括密封圈骨架、密封圈、骨架等,法兰盘外通过钢球的滚动摩擦套装外圈,外圈和法兰盘之间间隙处安装密封圈进行密封,密封圈通过密封圈骨架固定在外圈边缘处,骨架固定在法兰盘一侧,密封圈上设置有密封唇A、密封唇B、密封唇C与骨架配合实现密封,密封圈入口处设有导流唇与骨架配合实现对喷溅泥水的引导作用。本发明通过导流式密封结构设计以及密封圈与骨架的组件式结构设计,减少了接触唇的数量,有效降低轮毂轴承旋转力矩,同时大大提高产品的密封性能,增强密封试验的可靠性；不要求增加过多的密封空间,既能满足主机厂对高密封性能要求,又能满足低转矩性能要求。(The invention discloses a hub bearing unit with a diversion type high-sealing low-torque sealing structure, which mainly comprises a sealing ring framework, a sealing ring, a framework and the like, wherein an outer ring is sleeved outside a flange plate through rolling friction of a steel ball, the sealing ring is installed at a gap between the outer ring and the flange plate for sealing, the sealing ring is fixed at the edge of the outer ring through the sealing ring framework, the framework is fixed on one side of the flange plate, a sealing lip A, a sealing lip B and a sealing lip C are arranged on the sealing ring and matched with the framework to realize sealing, and a diversion lip is arranged at the inlet of the sealing ring and matched with the framework. According to the invention, through the design of the diversion type sealing structure and the assembly type structure design of the sealing ring and the framework, the number of contact lips is reduced, the rotating torque of the hub bearing is effectively reduced, meanwhile, the sealing performance of the product is greatly improved, and the reliability of a sealing test is enhanced; the requirement of increasing excessive sealing space is not required, the requirement of a host factory on high sealing performance can be met, and the requirement of low torque performance can be met.)

1. The utility model provides a wheel hub bearing unit of low torque seal structure of water conservancy diversion type high seal which characterized in that: mainly comprises an outer ring (1), a flange plate (2), a steel ball (3), a muddy water invasion channel (10), a sealing ring framework (11), a sealing ring (12), a sealing lip A (13), a sealing lip B (14), a sealing lip C (15), a flow guide lip (17) and a framework (18), the outer ring (1) is sleeved with the flange plate (2) through rolling friction of the steel ball (3), a sealing ring (12) is installed in a gap between the outer ring (1) and the flange plate (2) to seal, the sealing ring (12) is fixed to the edge of the outer ring (1) through a sealing ring framework (11), the framework (18) is fixed to one side of the flange plate (2), a sealing lip A (13), a sealing lip B (14), a sealing lip C (15) and the framework (18) are matched to realize sealing, and a guide lip (17) is arranged at the inlet of the sealing ring (12) to be matched with the framework (18) to realize the guide effect on splashing muddy water.

2. The hub bearing unit of a flow-guiding type high-sealing low-torque sealing structure according to claim 1, wherein: the sealing ring framework (11) and the outer ring (1) form a double-layer static seal (16) through interference fit.

3. The hub bearing unit of a flow-guiding type high-sealing low-torque sealing structure according to claim 1, wherein: and the inlets of the sealing ring (12) and the framework (18) form a labyrinth type muddy water intrusion channel (10) which is complex and tortuous.

4. The hub bearing unit of a flow-guiding type high-sealing low-torque sealing structure according to claim 1, wherein: the sealing lip A (13) has no interference with the framework (18), but the clearance between the sealing lip A (13) and the framework (18) is designed to be small.

5. The hub bearing unit of a flow-guiding type high-sealing low-torque sealing structure according to claim 1, wherein: and the sealing lip B (14) and the sealing lip C (15) are in interference fit with the framework (18).

Technical Field

The invention relates to the field of hub bearings, in particular to a hub bearing unit of a flow guide type high-sealing low-torque sealing structure.

Background

The sealing structure design of the existing hub bearing unit mainly comprises an outer ring 1, a flange plate 2, a steel ball 3, an original sealing framework 4, an original sealing ring 5, an original sealing lip A6, an original sealing lip B7, an original sealing lip C8 and an original static seal 9, wherein in the muddy water spraying process, a sealing channel is easy to intrude, a direct impact effect is formed on the sealing lip, meanwhile, in the static sealing structures of the original sealing ring 5 and the original sealing framework 4, the interference magnitude of the original sealing framework 4 and the outer ring 1 and the sealing effect of rubber are general, and the muddy water is easily intruded from the static sealing position after long-time washing. If the interference of the sealing lip is increased, the sealing effect can be enhanced, but the rotating moment is also increased correspondingly. Therefore, in the prior art, the torque requirement can be met by reducing the contact interference of the sealing lip, but the sealing effect is weakened by reducing the interference, and the external muddy water invasion risk is increased; the sealing effect can also be improved by increasing the contact interference of the sealing lip and improving the lip contact pressure, but the torque level of the assembly is correspondingly improved, and the requirement of low torque is not met, so that the balance point between the high sealing performance and the low torque performance is difficult to find. In addition, in the prior art, as the muddy water intrusion channel 10 of the sealing structure is relatively open, during the sealing test, splashed muddy water and impurity particles in the muddy water can easily enter and contact the sealing lip, and during the long-time test rotation and loading process, the muddy water and the impurity particles can accelerate the abrasion of the sealing lip and easily accelerate the sealing failure. Under the current development trend that requires both low torque and high sealing performance, the host computer factory has higher and higher requirements on the performance of the hub bearing sealing ring, and the requirements on the sealing design are correspondingly improved.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a hub bearing unit with a diversion type high-sealing low-torque sealing structure.

The purpose of the invention is achieved by the following technical scheme: the wheel hub bearing unit with the diversion type high-sealing low-torque sealing structure mainly comprises an outer ring, a flange plate, a steel ball, a muddy water intrusion channel, a sealing ring framework, a sealing ring, a sealing lip A, a sealing lip B, a sealing lip C, a diversion lip and a framework, wherein the outer ring is sleeved outside the flange plate through rolling friction of the steel ball, a sealing ring is installed at a gap between the outer ring and the flange plate to seal, the sealing ring is fixed at the edge of the outer ring through the sealing ring framework, the framework is fixed on one side of the flange plate, the sealing lip A, the sealing lip B, the sealing lip C is matched with the framework to realize sealing, and the diversion lip is arranged at the inlet of the sealing ring to.

The sealing ring framework and the outer ring form double-layer static sealing through interference fit.

The sealing ring and the skeleton entrance form a labyrinth type muddy water invasion channel which is complex and tortuous.

The sealing lip A has no interference with the framework, but the clearance between the sealing lip A and the framework is designed to be smaller.

And the sealing lip B and the sealing lip C are in interference fit with the framework.

The invention has the beneficial effects that: according to the invention, through the design of the diversion type sealing structure and the assembly type structure design of the sealing ring and the framework, the number of contact lips is reduced, the rotating torque of the hub bearing is effectively reduced, meanwhile, the sealing performance of the product is greatly improved, and the reliability of a sealing test is enhanced; the requirement of increasing excessive sealing space is not required, the requirement of a host factory on high sealing performance can be met, and the requirement of low torque performance can be met.

Drawings

Fig. 1 is a schematic structural diagram of the prior art.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a schematic structural diagram of the present invention.

Fig. 4 is a partially enlarged view of a portion B in fig. 3.

Description of reference numerals: the sealing device comprises an outer ring 1, a flange plate 2, a steel ball 3, an original sealing framework 4, an original sealing ring 5, an original sealing lip A6, an original sealing lip B7, an original sealing lip C8, an original static seal 9, a muddy water invasion channel 10, a sealing ring framework 11, a sealing ring 12, a sealing lip A13, a sealing lip B14, a sealing lip C15, a double-layer static seal 16, a flow guide lip 17 and a framework 18.

Detailed Description

The invention will be described in detail below with reference to the following drawings: