A hub bearing unit with an outer wrap secondary seal structure

Abstract

A kind of wheel hub bearing unit with secondary sealing structure of outwrap, including flange, inner ring and outer ring, flange is equipped with journal, inner ring is located on the journal, and retaining cage and sealing ring are equipped between inner ring and outer ring, retaining cage is equipped with ball, sealing ring is equipped outside ball, it is characterized in that: still include end cap, including bottom plate and annular plate, the inner wall of annular plate is tightly matched with the circumferential outer wall of outer ring, and part of bottom plate is correspondingly arranged outside sealing ring;First sealing part, it is arranged on the bottom plate, for sealing cooperation with the axial outer wall of inner ring;Second sealing part, it is arranged on the bottom plate, for sealing cooperation with the circumferential outer wall of journal.The protection inside, the secondary sealing provided by end cap, strengthens the sealing capacity.Resist external force, when being extruded and sharp collision by external force, the rigidity of end cap can protect the layer of sealing inside.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts, specifically to a wheel hub bearing unit with an externally encapsulated secondary sealing structure. Background Technology

[0002] Traditional wheel hub bearing units have limitations in sealing and protection performance. Due to the limitations of small sealing structures, it is difficult to achieve all-round, dead-angle-free sealing coverage. Once the sealing structure is subjected to external pressure or collision, it may cause sealing failure or damage to the magnetic ring. Utility Model Content

[0003] To overcome the shortcomings of the prior art, this utility model provides a wheel hub bearing unit with an externally encapsulated secondary sealing structure, which mainly solves the problem that traditional wheel hub bearing units may suffer sealing failure or damage to the magnetic ring if subjected to external pressure and collision.

[0004] The technical solution of this utility model is as follows: A hub bearing unit with an externally encapsulated secondary seal structure includes a flange, an inner ring, and an outer ring. The flange has a journal, the inner ring is mounted on the journal, and a cage and a sealing ring are provided between the inner ring and the outer ring. The cage has rolling balls, and the sealing ring is located outside the rolling balls. The unit also includes... The end cap includes a base plate and an annular plate, wherein the inner wall of the annular plate is tightly pressed against the circumferential outer wall of the outer ring, and a portion of the base plate is correspondingly disposed on the outer side of the sealing ring; The first sealing part is provided on the base plate and is used to seal with the axial outer wall of the inner ring; The second sealing part is provided on the base plate and is used for sealing cooperation with the circumferential outer wall of the journal.

[0005] The base plate is provided with a through hole, and the inner wall of the through hole is covered with a sealing lip. The first sealing part is the side end face of the sealing lip, and the second sealing part is the bottom end face of the sealing lip.

[0006] The rolling ball is a steel ball.

[0007] The journal has an annular groove on its circumferential outer wall, and the inner ring is installed in the annular groove.

[0008] The journal is provided with an axial mounting hole, which communicates with the through hole.

[0009] The mounting hole and the through hole are coaxially arranged.

[0010] The end cap is made of SUS304.

[0011] The beneficial effects of this utility model are as follows: This utility model provides a wheel hub bearing unit with an externally encapsulated secondary sealing structure, which has the following advantages: 1. Internal protection: The secondary seal provided by the end cap enhances the sealing capability. 2. Resistance to external forces: When subjected to external pressure or sharp impact, the rigidity of the end cap protects the internal seal. Attached Figure Description

[0012] Figure 1 This is a cross-sectional schematic diagram of one embodiment of the present invention.

[0013] Figure 2 This is a partial structural diagram of one embodiment of the present invention.

[0014] Figure 3 This is a schematic diagram of the pressure cap according to one embodiment of the present invention. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings. A hub bearing unit with an externally encapsulated secondary sealing structure includes a flange 1, an inner ring 2, and an outer ring 3. A journal 11 is provided on the flange, and the inner ring is disposed on the journal. A cage and a sealing ring 4 are provided between the inner ring and the outer ring. A ball bearing 23 is provided on the cage, and the sealing ring is disposed outside the ball bearing. The unit also includes an end cap 5, comprising a base plate 51 and an annular plate 52. The inner wall of the annular plate is tightly fitted with the circumferential outer wall of the outer ring. A portion of the base plate is disposed correspondingly outside the sealing ring. A first sealing part 521 is disposed on the base plate for sealing with the axial outer wall of the inner ring; a second sealing part 522 is disposed on the base plate for sealing with the circumferential outer wall of the journal. A pressure cap is added; the end cap is a sheet metal part made of SUS304, allowing for magnetic signal detection even if the internal structure contains a magnetic ring. The rubber sealing lip ensures a seamless seal without affecting the rotation of the wheel hub bearing unit. Furthermore, this structure improves appearance: scratches and dents on machined parts are difficult to avoid, but are covered by an external secondary sealing structure.

[0016] In this embodiment, as shown in the figure, the base plate is provided with a through hole 511, and the inner wall of the through hole is covered with a sealing lip 512. The first sealing part is the side end face of the sealing lip, and the second sealing part is the bottom end face of the sealing lip. This results in a better sealing effect.

[0017] In this embodiment, as shown in the figure, the rolling ball is a steel ball.

[0018] In this embodiment, as shown in the figure, the outer circumferential wall of the journal is provided with an annular groove, and the inner ring is installed in the annular groove. The installation is secure and not easily dislodged.

[0019] In this embodiment, as shown in the figure, the journal is provided with an axial mounting hole 111, which communicates with the through hole. This mounting hole is used for mounting the drive shaft.

[0020] In this embodiment, as shown in the figure, the mounting hole and the through hole are coaxially arranged.

[0021] In this embodiment, as shown in the figure, the end cap is made of SUS304. Compared to steel, SUS304 has the same strength and extremely strong rust resistance.

[0022] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. The embodiments should not be considered as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A hub bearing unit with an externally encapsulated secondary sealing structure, comprising a flange (1), an inner ring (2), and an outer ring (3), wherein a journal (11) is provided on the flange, the inner ring is disposed on the journal, a cage and a sealing ring (4) are provided between the inner ring and the outer ring, a ball (23) is provided on the cage, and the sealing ring is disposed outside the ball, characterized in that: Also includes The end cap (5) includes a base plate (51) and an annular plate (52). The inner wall of the annular plate is tightly pressed against the circumferential outer wall of the outer ring, and part of the base plate is correspondingly located on the outside of the sealing ring. The first sealing part (521) is provided on the base plate and is used to seal with the axial outer wall of the inner ring; The second sealing part (522) is provided on the base plate and is used to seal with the circumferential outer wall of the journal.

2. A hub bearing unit with an externally encapsulated secondary sealing structure according to claim 1, characterized in that: The base plate is provided with a through hole (511), and the inner wall of the through hole is covered with a sealing lip (512). The first sealing part is the side end face of the sealing lip, and the second sealing part is the bottom end face of the sealing lip.

3. A hub bearing unit with an externally encapsulated secondary sealing structure according to claim 1, characterized in that: The rolling ball is a steel ball.

4. A hub bearing unit with an externally encapsulated secondary sealing structure according to claim 1, characterized in that: The journal has an annular groove on its circumferential outer wall, and the inner ring is installed in the annular groove.

5. A hub bearing unit with an externally encapsulated secondary sealing structure according to claim 2, characterized in that: The journal is provided with an axial mounting hole (111), which communicates with the through hole.

6. A wheel hub bearing unit with an externally encapsulated secondary sealing structure according to claim 5, characterized in that: The mounting hole and the through hole are coaxially arranged.

7. A wheel hub bearing unit with an externally encapsulated secondary sealing structure according to claim 1, characterized in that: The end cap is made of SUS304.

Images