CN-121803650-B - Flower-drum sealing mechanism and flower-drum assembly

Abstract

The invention relates to the field of bicycles, in particular to a hub sealing mechanism and a hub assembly. Including first sealing washer, be equipped with first connecting portion on the tower footing, the second sealing washer, be equipped with the second connecting portion on the flower-drum shell, the inboard of second connecting portion is equipped with the slide along the axial slip of second sealing washer, slide one side is equipped with the push pedal, fixedly connected with pretension spring between push pedal and the second connecting portion, be equipped with the elasticity shirt rim between second connecting portion and the slide, enclose jointly between elasticity shirt rim, second connecting portion and the slide and close and be formed with annular air cavity, a plurality of air inlets have been seted up to the week side of second connecting portion. According to the invention, the pre-tightening spring provides initial compression force, air enters the annular air cavity through the air inlet when the hub shell rotates, so that the elastic skirt is expanded and props against the push plate, the second sealing ring is driven to further compress the first sealing ring, and the dynamic sealing is realized by matching with the protection of the breathable waterproof sleeve.

Inventors

• XU PEIPEI
• YU JIAN
• YU ZHIJIE
• MIAO HONGBO
• LU ZHOU

Assignees

• 宁波晟路车业有限公司

Dates

Publication Date

20260508

Application Date

20260306

Claims (10)

1. 1. The utility model provides a flower-drum sealing mechanism, uses between tower base and flower-drum shell, its characterized in that includes: the tower foundation is provided with a first connecting part for installing the first sealing ring; the second connecting part is used for installing the second sealing ring; the first sealing ring and the second sealing ring are mutually abutted in the axial direction to form a sealing interface; A sliding plate is arranged on the inner side of the second connecting part in a sliding manner along the axial direction of the second sealing ring, and the sliding plate is fixedly connected with the second sealing ring; A pushing plate attached to the second sealing ring is arranged on one side of the sliding plate away from the second sealing ring, and a pre-tightening spring is fixedly connected between the pushing plate and the second connecting part along the sliding direction of the sliding plate and is used for applying axial pre-tightening force towards the first sealing ring to the second sealing ring; An elastic skirt edge is arranged between the second connecting part and the sliding plate, an annular air cavity is formed by surrounding the elastic skirt edge, the second connecting part and the sliding plate together, and a plurality of air inlets communicated with the annular air cavity are formed in the periphery of the second connecting part; In the rotating process of the hub shell, the elastic skirt is in a deformation expansion state under the action of air pressure, so that axial thrust towards the direction of the first sealing ring is applied to the sliding plate.
2. 2. The hub sealing mechanism of claim 1, wherein the outer peripheral cover of the second connection portion is provided with a breathable waterproof jacket covering the outside of the air inlet, made of a hydrophobic porous material for blocking liquid water and dust while allowing air to enter the annular air chamber.
3. 3. The hub sealing mechanism according to claim 2, wherein the elastic skirt is an annular bag sleeve, the elastic skirt is sleeved on the periphery of the push plate, two ends of the annular bag sleeve are fixedly connected with the sliding plate and the second connecting portion respectively, an outer ring protruding outwards is arranged on the periphery of the push plate, and the outer ring is abutted against the inner wall of the annular bag sleeve.
4. 4. The hub sealing mechanism of claim 1, wherein the second connecting portion has a centrifugal member disposed on an inner side thereof for abutting against a surface of the push plate for imparting an axial force component to the push plate by centrifugal action upon rotation of the hub shell.
5. 5. The hub sealing mechanism of claim 4, wherein the centrifugal member comprises an end ring and a plurality of elastic pressing sheets uniformly distributed along the circumferential direction of the end ring, the end ring is fixedly connected with the second connecting part and coaxially arranged with the second sealing ring, one end of the elastic pressing sheet is fixed on the end ring, the other end of the elastic pressing sheet is a free deformation end, and the deformation end is abutted against the surface of the push plate.
6. 6. The hub sealing mechanism of claim 1, wherein the first seal ring is rotatable about its axis, a rotational connection is provided between the first connection and the first seal ring, and when the second seal ring rotates, the first seal ring against the second seal ring is in a synchronous rotation state.
7. 7. The hub sealing mechanism of claim 6, wherein the rotary connector comprises a stationary ring and a rotary ring and a plurality of balls disposed therebetween, the stationary ring is fixedly connected to the first connecting portion, the rotary ring is fixedly connected to the first seal ring, and the first seal ring is provided with a first seal lip extending axially and wrapping an outer periphery of the stationary ring.
8. 8. The hub sealing mechanism of claim 2, wherein the second seal ring is provided with a second seal bead extending axially and surrounding the outer periphery of the breathable waterproof jacket.
9. 9. The flower-drum subassembly, including the axis, epaxial rotatable cover is equipped with tower base and flower-drum shell, be equipped with ratchet drive mechanism between tower base and the flower-drum shell, its characterized in that still includes the flower-drum sealing mechanism of any one of claims 1-8, flower-drum sealing mechanism sets up between the adjacent terminal surface of tower base and flower-drum shell.
10. 10. The hub assembly according to claim 9, wherein the ratchet transmission mechanism comprises a ratchet ring arranged on the end face of the hub shell, and a plurality of elastic pawls arranged on the opposite end face of the tower foundation and uniformly distributed along the circumferential direction, and the elastic pawls are abutted against the ratchet ring to form releasable meshing engagement.

Description

Flower-drum sealing mechanism and flower-drum assembly Technical Field The invention relates to the field of bicycles, in particular to a hub sealing mechanism and a hub assembly. Background The hub is used as a core component for connecting an axle with spokes in a bicycle, and the running performance and durability of the hub are directly related to the riding experience and reliability of the whole bicycle. In the actual use process, the flower-drum is exposed to rainwater, dust and other external pollutant environments for a long time, so that the external impurities are required to be effectively isolated, and the internal transmission mechanism is required to be protected from invasion. However, most of the bicycle hubs on the market at present have insufficient sealing between the sleeve and the ratchet wheel, and most of the sealing structures are simple rubber rings or static contact seals, so that the bicycle hubs are difficult to cope with vibration, micro motion and temperature change during riding. The water vapor and dust sand are easy to permeate through the gaps, so that not only is the rotation resistance increased and abnormal sound frequently generated, but also the abrasion of internal parts is accelerated, and the service life of the flower drum is shortened. Therefore, a hub sealing mechanism and a hub assembly are needed at present, and can continuously maintain high-reliability dynamic sealing in the relative rotation process of the tower foundation and the hub shell, so that pollutants such as rainwater, dust and the like are effectively prevented from invading a ratchet transmission area. The problems of internal abrasion, increase of rotation resistance and abnormal sound caused by sealing failure are avoided, and therefore the service life and the operation stability of the flower drum are improved. Disclosure of Invention To the problem that prior art exists, provide flower-drum sealing mechanism and flower-drum subassembly, provide initial clamp force through the pretension spring, air gets into annular air cavity through the air inlet when the flower-drum shell is rotatory, makes elasticity shirt rim inflation and support the pressure push pedal, and the drive second sealing washer further compresses tightly first sealing washer, and ventilative waterproof jacket protection of cooperation realizes dynamic seal. In order to solve the problems in the prior art, the invention provides a hub sealing mechanism which is applied between a tower foundation and a hub shell and comprises a first sealing ring, wherein a first connecting part for installing the first sealing ring and a second sealing ring are arranged on the tower foundation, a second connecting part for installing the second sealing ring is arranged on the hub shell, the first sealing ring and the second sealing ring are mutually abutted in the axial direction to form a sealing interface, a sliding plate is arranged on the inner side of the second connecting part along the axial sliding of the second sealing ring, the sliding plate is fixedly connected with the second sealing ring, a pushing plate attached to the sliding plate is arranged on one side of the sliding plate far away from the second sealing ring, a pre-tightening spring is fixedly connected between the pushing plate and the second connecting part along the sliding direction of the sliding plate and is used for applying axial pre-tightening force towards the first sealing ring to the second sealing ring, an elastic skirt edge is arranged between the second connecting part and the sliding plate, an annular air cavity is formed by jointly encircling the elastic skirt edge, a plurality of air cavities are formed on the periphery of the second connecting part, the sliding plate is fixedly connected with the shell, and the sliding plate is in the axial direction of the annular skirt edge is communicated with the air inlet, and the air cavity is stressed in the axial direction of the expansion state when the sliding plate is stressed by the sliding plate. Preferably, the outer peripheral cover of the second connection part is provided with a breathable waterproof jacket, which covers the outside of the air inlet and is made of a hydrophobic porous material for blocking liquid water and dust while allowing air to enter the annular air cavity. Preferably, the elastic skirt is an annular bag sleeve, the elastic skirt is sleeved on the periphery of the push plate, two ends of the annular bag sleeve are fixedly connected with the sliding plate and the second connecting part respectively, an outer ring protruding outwards is arranged on the periphery of the push plate, and the outer ring is abutted to the inner wall of the annular bag sleeve. Preferably, a centrifugal piece abutting against the surface of the push plate is arranged on the inner side of the second connecting portion, and is used for applying axial component force to the push plate due to centrifugal actio