TWM658164U - Bottom bracket set - Google Patents

Abstract

A five-way bowl assembly comprises at least: a first five-way bowl, which is used to be screwed on one end side of a five-way tube of a bicycle and has a bearing mounting portion; a first bearing, which is used to be mounted in the bearing mounting portion; a first sealing protective member, which has an axial support sleeve portion for sleeved on the first bearing, and a radial ring portion for abutting against the outer end wall of the inner seat ring of the first bearing, and a first gap is formed between the radial ring portion and the first five-way bowl; a first axial inner sealing component, which has a clamping portion for being nested in the first five-way bowl and clamped between the outer seat ring and the five-way bowl, and a sealing portion is extended from the clamping portion for elastically resisting and sealing the axial support sleeve portion of the first sealing protective member. Accordingly, it can be ensured that the five-way bowl set has a good sealing effect.

Description

Five-way headset

This invention relates to a bicycle component, in particular to a bottom bracket headset for installation on the bottom bracket tube of a bicycle frame.

The bottom bracket (BB), also known as the bottom bracket axle or middle bracket, is an important component in the transmission mechanism of a bicycle. It can be installed on the bottom bracket of the frame and can be used with a crankset for the rider to pedal to drive other transmission mechanisms and rotate the wheels.

The five-way bowl set includes at least two five-way bowls or toothed bowls for installation on the left and right ends of the five-way tube, and two bearings installed in the five-way bowls. Some five-way bowl sets also include a spindle installed in the bearings.

There are two types of bottom bracket cups: internal-mounted and external-mounted. The Republic of China's Publication No. TW563661U patent discloses an internal-mounted bottom bracket cup. Since the internal-mounted bottom bracket cup has many disadvantages, the Republic of China's Invention Patent No. TW I392617 discloses an external-mounted bottom bracket cup to improve the disadvantages of the internal-mounted bottom bracket cup.

The above-mentioned externally mounted bottom bracket cup assembly is further provided with a gasket and a dustproof ring respectively installed on the bottom bracket cup assembly to prevent external dirt, such as water, various dusts, impurities and other pollutants from entering the bearings of the bottom bracket cup assembly, thereby hindering the smooth rotation of the bearings. Unfortunately, although the dustproof ring and the gasket can almost achieve a completely sealed effect to prevent the above-mentioned pollutants from entering from the outside of the bearings, there is also a disadvantage that the contact area is too large, resulting in a large friction resistance, thereby hindering the rotation of the bearings.

Secondly, although the inner annular wall of the gasket can be matched with at least one annular sealing gasket to elastically press against the outer peripheral wall of the spindle to prevent the above-mentioned contaminants from entering from the inner side of the bearing, the structural design that uses the annular sealing gasket to achieve the sealing effect still has some disadvantages. For example, the outer diameter of the spindle often has a large manufacturing tolerance. If there is excessive interference fit, it is easy to make the gasket difficult to install on the spindle, or it may be misaligned due to improper lateral extrusion, thereby affecting the sealing effect. If the compression of the sealing gasket is too large, it will also reduce the service life. If the interference fit is too small, it will affect the sealing effect.

The invention patent of Republic of China Certificate No. TW I491531 also discloses a bicycle bottom bracket assembly, which is equivalent to the above-mentioned five-way bowl set, and mainly includes a support member equivalent to the above-mentioned five-way bowl, a bearing unit equivalent to the above-mentioned bearing, and a sealing member having functions similar to the above-mentioned gasket and dust ring, but the difference is that the sealing member actually includes five members, namely, an axial inner sealing member, an axial outer sealing member, a sealing protective member, an auxiliary cover and a support ring; the axial inner sealing member is installed between the inner part of the support member and the inner end side of the inner race of the bearing to prevent The above-mentioned pollutants enter from the inner side of the bearing; the axial external sealing component is installed inside the supporting component and the inner peripheral wall of the inner seat ring of the bearing near the outer end side, and is axially clamped and fixed between the supporting ring and the outer end side of the outer seat ring of the bearing to prevent the above-mentioned pollutants from entering from the outer side of the bearing; the sealing protective member is equivalent to the above-mentioned gasket, which is mainly used to nest and support the bearing; the auxiliary cover is installed between the inside of the supporting component and the sealing protective member, and forms a labyrinth structure with the sealing protective member, so that the above-mentioned pollutants are not easy to enter the outer side of the bearing through the labyrinth structure.

The bottom bracket assembly utilizes the sealing component design to improve the sealing performance of the bearing, thereby reducing the probability of contaminants entering the interior of the bearing, and the rotational torque applied to the bearing by the sealing component is relatively small, which can ensure the smoothness and lubricity of the bearing rotation.

However, although the bottom bracket assembly is designed with a sealing component, the overall design is still not perfect. For example, first, there are many overall components, the component cost is high, and there are many assembly steps, resulting in high assembly costs. In particular, the auxiliary cover can be used with the sealing protective member to form a maze structure, but it is on the same side as the axial external sealing component, and it seems that there is a need for simplification or structural integration.

Second, although contaminants can be prevented from entering the bearing, the bearing is not completely isolated and sealed from the outside. Therefore, part of the bearing, especially the exposed part on the outer race, will still be exposed to contaminants, especially water or other impurities containing water, which will cause rust on the outer race made of metal material. These contaminants, especially impurities with higher hardness, are also easy to wear the outer race, thereby affecting the sealing effect between the outer race and the axial inner sealing component, or between the outer race and the axial outer sealing component.

Third, the axial external sealing component is usually made of elastic materials with good sealing properties such as rubber. Therefore, the firmness of the press-fit assembly is poor, and there is a lack of a flat and solid reference surface between the outer seat ring, which easily leads to poor axial assembly or warping. Therefore, another implementation is to use another supporting ring installed in the supporting component to clamp it to the outer seat ring, but the supporting ring and the axial external sealing component are not integrated components, and additional assembly steps are required. Moreover, if the supporting ring is loose due to poor assembly or assembly tolerance, it will also affect the sealing of the axial external sealing component. Although the axial external sealing member may also be filled with adhesive between the supporting member to ensure its axial movement, the process and cost of adding the adhesive are increased, causing trouble to the assemblers. In addition, if the operation is not careful, the adhesive may enter the interior of the bearing, which may also hinder or damage the normal operation of the bearing.

Fourth, the axial internal sealing component is usually made of an elastic material with good sealing properties such as rubber, but the firmness of the press-fit assembly is poor, and there is a lack of a flat and solid reference surface between the support component, which easily leads to poor axial assembly or warping. Therefore, it is usually necessary to use an adhesive to adhere to the support component, which has the same disadvantages of increasing the number of steps and possibly hindering or damaging the normal operation of the bearing.

The invention provides a five-way bowl assembly, which at least includes: a first five-way bowl, which is used to be screwed on one end side of a five-way tube of a bicycle and has a bearing mounting portion; a first bearing, which is used to be mounted in the bearing mounting portion; a first sealing protective member, which has an axial support sleeve portion for passing through the first bearing, and a radial ring portion for abutting against the outer end wall of the inner seat ring of the first bearing, and a first gap is formed between the radial ring portion and the first five-way bowl; a first axial inner sealing component, which has a clamping portion for being nested in the first five-way bowl and clamped between the outer seat ring and the five-way bowl, and a sealing portion extends from the clamping portion to elastically resist and seal the axial support sleeve portion of the first sealing protective member.

The bottom bracket cup assembly provided by the invention can at least completely seal the inner end side of the first bearing through the first axial internal sealing component, so that the inner end side is completely isolated from the outside world and prevents pollutants from entering from the inner end side of the first bearing. Therefore, a good sealing effect can be achieved, thereby ensuring that the bottom bracket cup assembly can be firmly supported and operate smoothly.

As shown in FIGS. 1 to 3 , the invention provides a preferred embodiment of a bottom bracket bowl assembly. The bottom bracket bowl assembly 1 is of an external screw-on type and comprises at least: a first bottom bracket bowl 10 a, a first bearing 20 a, a first sealing protective member 30 a and a first axial sealing member 40 a; wherein:

The first five-way bowl 10a, as shown in FIGS. 4 and 5, has a connected screw portion 11 and a bearing mounting portion 12; the screw portion 11 has an outer thread 111, which can be screwed and locked to an inner thread 2b formed inside a first end side 2a of two opposite end sides of a five-way tube 2 on a bicycle frame, as shown in FIG. 9; the bearing mounting portion 12 has a mounting annular groove 121 with an opening facing outward, and the mounting annular groove 121 has an inner peripheral annular wall 122 and an annular bottom wall 123.

The first bearing 20a has an outer race 21, an inner race 22, and a plurality of rollers 23 mounted in the outer race 21 and the inner race 22; the outer race 21 can be nested in the mounting groove 121 of the first five-way bowl 10a. The rollers 23 can be needle rollers, ball rollers, or the like.

The first sealing protective member 30a, as shown in FIG6 , is made of non-metallic material, such as nylon material, and has an axial support sleeve portion 31 connected thereto, and a radial ring portion 32 extending from the outer end side of the axial support sleeve portion 31 toward the radial outer side; the axial support sleeve portion 31 is used to be inserted and supported inside the inner race 22 of the first bearing 20a; The radial annular portion 32 is used to abut against the outer end wall 221 of the inner seat ring 22 and has an outer peripheral edge 321 and an inner annular wall 322. A first gap S1 is formed between the outer peripheral edge 321 and the inner annular wall 122 of the first five-way bowl 10a. The inner annular wall 322 has an annular protrusion 323 protruding inwardly along the radial middle portion.

As shown in FIG. 7 , the first axial internal sealing component 40a has a clamped portion 41 and a sealing portion 42 extending integrally from the clamped portion 41; the clamped portion 41 can be nested on the inner circumferential wall 122 of the first five-way bowl 10a, and at the same time clamped between the annular bottom wall 123 and the inner end wall 211 of the outer seat ring 21; the sealing portion 42 has a sealing end edge 421, which can elastically resist and seal against the opposite portion of the outer circumferential wall 311 of the axial support sleeve 31 of the first sealing protective member 30a.

In this embodiment, the five-way bowl assembly 1 further includes a first axial external sealing member 50a, which is nested in the inner circumferential wall 122 of the first five-way bowl 10a and abuts against the outer end wall 212 of the outer seat ring 21 of the first bearing 20a, and has an outer peripheral sealing edge 51, an inner peripheral sealing edge 52 and an annular recess 53 between the outer peripheral sealing edge 51 and the inner peripheral sealing edge 52 protruding along the axial outer side; the outer peripheral sealing edge 51 can be elastically abutted against the diameter of the first sealing protective member 30a. The radial annular portion 32 is located on the inner annular wall 322 of the outer periphery of the annular protrusion 323 to form a first sealing structure; the inner peripheral sealing end edge 52 can be used to elastically press against the radial annular portion 32 of the first sealing protective member 30a on the inner annular wall 322 of the inner periphery of the annular protrusion 323 to form a second sealing structure; the annular recess 53 can be used to accommodate the annular protrusion 323, and a second gap S2 is formed between them, and a labyrinth structure with a curved cross-section can be formed between the first sealing structure and the second sealing structure.

In this embodiment, the clamped portion 41 of the first axial internal sealing component 40a has an inner end wall 411 for abutting against the annular bottom wall 123 of the first five-way bowl 10a, an outer end wall 412 for abutting against the inner end wall 211 of the outer seat ring 21, and an outer annular wall 413 for being nested in the inner circumferential wall 122 of the first five-way bowl 10a. In essence, the first axial internal sealing component 40a includes a main body component 401 made of elastic material, and a support plate 402 connected to the inner end side of the main body component 401 and made of metal material; the main body component 401 is used to form most of the clamped portion 41 and the sealing portion 42; the support plate 402 is used to form at least a portion of the inner end wall 411 of the clamped portion 41, which can be fitted to the annular bottom wall 123 of the first five-way bowl 10a.

In this embodiment, as shown in FIG. 8 , the first axial external sealing member 50a has an inner end wall 54 for abutting against the outer end wall 212 of the outer seat ring 21, an outer annular wall 55 for being embedded in the inner circumferential wall 122 of the first five-way bowl 10a, and an outer end wall 56 for protruding the outer peripheral sealing end edge 51, the inner peripheral sealing end edge 52 and the annular recess 53; the first axial external sealing member 50a includes a member made of elastic material. A main body component 501, and a support plate 502 connected to the inner end side of the main body component 501 and made of metal material; the main body component 501 is used to form the first axial external sealing component 50a including the outer peripheral sealing end edge 51, the inner peripheral sealing end edge 52 and most of the annular recess 53; the support plate 502 is used to form at least a part of the inner end wall 54 of the first axial external sealing component 50a, which can be fitted on the outer end wall 212 of the outer seat ring 21.

It should be particularly noted that the bottom bracket bowl assembly 1 of the present embodiment has two ends that are mirror-symmetrical to each other, such as a left end and a right end. The first bottom bracket bowl 10a, a first bearing 20a, a first sealing protector 30a, a first axial inner sealing member 40a and a first axial outer sealing member 50a can together form a component at one end, such as the left end, for installation on the left end of the bottom bracket tube 2. Based on this, it can be easily understood that the bottom bracket bowl 10a, a first bearing 20a, a first sealing protector 30a, a first axial inner sealing member 40a and a first axial outer sealing member 50a can together form a component at one end, such as the left end, for installation on the left end of the bottom bracket tube 2. The bottom bracket bowl assembly 1 may further include: a second bottom bracket bowl 10b, a second bearing 20b, a second sealing protector 30b, a second axial inner sealing member 40b and a second axial outer sealing member 50b, which together form an assembly at the other end, such as the right end, for installation on the left end of the bottom bracket tube 2. The first bottom bracket bowl 10a and the second bottom bracket bowl 10b may be selectively nested to assemble a common connecting tube. Among them:

The second bottom bracket 10b has a screw lock portion 11 and a bearing mounting portion 12 connected to each other; the screw lock portion 11 has an outer thread 111, which can be screwed and locked to an inner thread 2d formed inside a second end side 2c of two opposite end sides of a bottom bracket 2 on a bicycle frame; the bearing mounting portion 12 has a mounting annular groove 121 with an opening facing outward, and the mounting annular groove 121 has an inner peripheral annular wall 122 and an annular bottom wall 123.

The second bearing 20b has an outer race 21, an inner race 22, and a plurality of rollers 23 mounted in the outer race 21 and the inner race 22; the outer race 21 can be nested in the mounting groove 121 of the second five-way bowl 10b. The rollers 23 can be needle rollers, ball rollers, or the like.

The second sealing protective member 30b is made of non-metallic material, such as nylon material, and has an axial support sleeve 31 connected thereto, and a radial ring portion 32 extending from the outer end side of the axial support sleeve 31 toward the radial outer side; the axial support sleeve 31 is used to be inserted and supported inside the inner race 22 of the second bearing 20b; the radial ring portion 32 is used to be inserted into the inner race 22 of the second bearing 20b. The ring portion 32 is used to abut against the outer end wall 221 of the inner seat ring 22 and has an outer peripheral edge 321 and an inner ring wall 322. A first gap S1 is formed between the outer peripheral edge 321 and the inner ring wall 122 of the second five-way bowl 10b. The inner ring wall 322 has an annular protrusion 323 protruding inwardly along the radial middle portion.

The second axial internal sealing component 40b has a clamped portion 41 and a sealing portion 42 extending integrally from the clamped portion 41; the clamped portion 41 can be nested on the inner circumferential wall 122 of the second five-way bowl 10b, and at the same time clamped between the annular bottom wall 123 and the inner end wall 211 of the outer seat ring 21; the sealing portion 42 has a sealing end edge 421, which can elastically resist and seal against the opposite portion of the outer circumferential wall 311 of the axial supporting sleeve 31 of the second sealing protective member 30b.

In this embodiment, the five-way bowl assembly 1 further includes a second axial external sealing member 50b, which is nested in the inner circumferential wall 122 of the second five-way bowl 10b and abuts against the outer end wall 212 of the outer seat ring 21 of the second bearing 20b, and has an outer peripheral sealing edge 51, an inner peripheral sealing edge 52 and an annular recess 53 between the outer peripheral sealing edge 51 and the inner peripheral sealing edge 52 protruding along the axial outer side; the outer peripheral sealing edge 51 can be elastically abutted against the diameter of the second sealing protective member 30b. The radial annular portion 32 is located on the inner annular wall 322 of the outer periphery of the annular protrusion 323 to form a first sealing structure; the inner peripheral sealing end edge 52 can be used to elastically abut the radial annular portion 32 of the second sealing protective member 30b on the inner annular wall 322 of the inner periphery of the annular protrusion 323 to form a second sealing structure; the annular recess 53 can be used to accommodate the annular protrusion 323, and a second gap S2 is formed between them, and a labyrinth structure with a curved cross-section can be formed between the first sealing structure and the second sealing structure.

In this embodiment, the clamped portion 41 of the second axial internal sealing member 40b has an inner end wall 411 for abutting against the annular bottom wall 123 of the second five-way bowl 10b, an outer end wall 412 for abutting against the inner end wall 211 of the outer seat ring 21, and an outer annular wall 413 for being nested in the inner circumferential wall 122 of the second five-way bowl 10b. In essence, the second axial internal sealing component 40b includes a main body component 401 made of elastic material, and a support plate 402 connected to the inner end side of the main body component 401 and made of metal material; the main body component 401 is used to form most of the clamped portion 41 and the sealing portion 42; the support plate 402 is used to form at least a portion of the inner end wall 411 of the clamped portion 41, which can be fitted on the annular bottom wall 123 of the second five-way bowl 10b.

In this embodiment, the second axial external sealing member 50b has an inner end wall 54 for abutting against the outer end wall 212 of the outer seat ring 21, an outer annular wall 55 for being embedded in the inner peripheral annular wall 122 of the second five-way bowl 10b, and an outer end wall 56 for protruding the outer peripheral sealing end edge 51, the inner peripheral sealing end edge 52 and the annular recess 53; the second axial external sealing member 50b includes a body made of elastic material. Component 501, and a support plate 502 connected to the inner end side of the main component 501 and made of metal material; the main component 501 is used to form the second axial external sealing component 50b including the outer peripheral sealing end edge 51, the inner peripheral sealing end edge 52 and most of the annular recess 53; the support plate 502 is used to form at least a part of the inner end wall 54 of the second axial external sealing component 50b, which can be fitted on the outer end wall 212 of the outer seat ring 21.

The first five-way bowl 10a and the second five-way bowl 10b can be further connected to each other and provided with an inner cavity operating part 13 between the screw locking part 11 and the bearing mounting part 12, so that the installer can insert a specific tool from the outside and position it in the inner cavity operating part 13, and then directly turn and drive the first five-way bowl 10a and the second five-way bowl 10b to screw and lock them on the five-way tube 2, or to loosen them.

The bottom bracket bowl assembly 1 of the above embodiment is of an external screw-on type, but is not limited thereto, and may also be of a common press-in type. Specifically, the first bottom bracket bowl 10a may be press-fitted and positioned inside one of the two opposite ends of the bottom bracket tube 2. Similarly, the second bottom bracket bowl 10b may also be press-fitted and positioned inside the other of the two opposite ends of the bottom bracket tube 2.

Another press-in type, similarly, the first five-way bowl 10a and the second five-way bowl 10b can be pressed into the two opposite ends of the five-way tube 2, respectively, but the difference is that the screw lock part 11 of the first five-way bowl 10a and the screw lock part 11 of the second five-way bowl 10b can be screwed together and locked, so one of the screw lock parts 11 is an external thread and the other is an internal thread. However, no matter how the five-way bowl set 1 of the present invention is installed and fixed on the five-way tube 2, it is a known structure and not the technical focus of the present invention, so it is not elaborated here.

From the above description, we can know that the five-way bowl set 1 has the following features and can achieve the following effects:

First, the five-way bowl assembly 1 of the present invention directly utilizes the special structural design of the first sealing protective member 30a and the first axial external sealing member 50a, and the second sealing protective member 30b and the second axial external sealing member 50b to obtain a maze-like structural design. Therefore, there is no need to provide a conventional auxiliary cover, thereby effectively reducing components, thereby reducing component costs and assembly costs.

Secondly, the five-way bowl assembly 1 of the present invention utilizes the special structural design of the first axial inner sealing component 40a, the second axial inner sealing component 40b, the first axial outer sealing component 50a and the second axial outer sealing component 50b, and the specially designed assembly relationship with the peripheral components, so that the first bearing 20a or the second bearing 20b can be completely sealed inside, so that it is completely isolated from the outside world. Therefore, it is possible to better prevent pollutants from entering the bearing 20a or the second bearing 20b, so as to prevent the bearing 20a or the second bearing 20b, especially the outer race 21, from rusting or wearing, thereby achieving a better sealing effect and a longer service life.

Thirdly, the sealing components of the invention, such as the first axial inner sealing component 40a, the second axial inner sealing component 40b, the first axial outer sealing component 50a and the second axial outer sealing component 50b, are all integrally provided with a supporting plate 402, 502 made of a metal material, so as to form a flat and solid reference surface for abutting against the relative wall surfaces of the first five-way bowl 10a and the second five-way bowl 10b, or the relative wall surfaces of the outer seat ring 21 of the first bearing 20a and the outer seat ring 21 of the second bearing 20b, thereby ensuring that the sealing components are effectively and securely installed and positioned without causing poor assembly or looseness, so as to exert a good sealing effect. Secondly, there is no need to use the known support ring or adhesive for fixing, which not only simplifies the structure and reduces the assembly process, but also prevents the adhesive from entering the first bearing 20a or the second bearing 20b due to careless operation by the assembler, thereby hindering or damaging their normal operation.

In summary, this invention has excellent practicality among similar products. At the same time, after searching relevant domestic and foreign technical data or patent documents, no similar structure has been found before. Therefore, this invention has the requirements for a new patent, and an application is filed in accordance with the law. However, the above is only a partial feasible implementation example of this invention. Any equivalent structural changes made by applying the description of this invention and the scope of the patent application should be included in the patent scope of this invention.

1: Five-way headset

2: Five-way pipe

2a: First end side

2b: Internal thread

2c: Second end side

2d: Internal thread

10a: First Five-Way Bowl

10b: First Five-Way Bowl

11: Screw lock part

111: External thread

12: Bearing installation location

121: Install the ring groove

122: Inner annular wall

123: Annular bottom wall

20a: First bearing

20b: First bearing

21: Outer race

211: Inner end wall

212: Outer end wall

22: Inner race

221: Outer end wall

23: Roller

30a: First sealing protective member

30b: First sealing protective member

31: Axial support sleeve

311: Outer Ring Wall

32: Radial ring

321: Periphery

322: medial annular wall

323: Ring-shaped protrusion

40a: First axial inner sealing component

40b: First axial inner sealing component

41: Part of the affected area

411: Inner end wall

412: Outer end wall

413: Outer Ring Wall

42: Sealing part

421: Sealed edge

50a: First axial external sealing component

50b: First axial external sealing component

51: Peripheral sealing edge

52: Inner sealing edge

53: Annular concave part

54: Inner end wall

55: Outer Ring Wall

56: Outer end wall

S1: First gap

S2: Second gap

[Figure 1] is a three-dimensional external view of the five-way bowl set of the present invention. [Figure 2] is a partial cross-sectional view of either end of the five-way bowl set of the present invention. [Figure 3] is a three-dimensional exploded view of either end of the five-way bowl set of the present invention. [Figure 4] is a cross-sectional view of the first five-way bowl or the second five-way bowl of the present invention along the axial direction. [Figure 5] is a partial enlarged view of Figure 2 of the present invention. [Figure 6] is a partial three-dimensional cross-sectional view of the first sealing protective member or the second sealing protective member of the present invention. [Figure 7] is a partial three-dimensional cross-sectional view of the first axial inner sealing member or the second axial inner sealing member of the present invention. [Figure 8] is a partial three-dimensional cross-sectional view of the first axial outer sealing member or the second axial outer sealing member of the present invention. [Figure 9] is a cross-sectional view of the five-way headset assembly of this creation installed on a five-way tube.

10a: First Five-Way Bowl

10b: First Five-Way Bowl

12: Bearing installation location

122: Inner annular wall

123: Annular bottom wall

20a: First bearing

20b: First bearing

21: Outer race

211: Inner end wall

212: Outer end wall

22: Inner race

221: Outer end wall

23: Roller

30a: First sealing protective member

30b: First sealing protective member

31: Axial support sleeve

311: Outer Ring Wall

32: Radial ring

323: Ring-shaped protrusion

40a: First axial inner sealing component

40b: First axial inner sealing component

41: Part of the affected area

42: Sealing part

421: Sealed edge

50a: First axial external sealing component

50b: First axial external sealing component

51: Peripheral sealing edge

52: Inner sealing edge

53: Annular concave part

S1: First gap

S2: Second gap

Claims (10)

A five-way bowl assembly at least comprises: a first five-way bowl having a bearing mounting portion, the bearing mounting portion having a mounting annular groove opening outward, the mounting annular groove having an inner peripheral annular wall and an annular bottom wall; a first bearing having an outer seat ring, an inner seat ring, and a plurality of rollers mounted in the outer seat ring and the inner seat ring; the outer seat ring can be nested in the mounting annular groove of the first five-way bowl; a first sealing protective member having an axial support sleeve connected thereto, and a radial annular portion extending from the outer end side of the axial support sleeve toward the radial outward side; the axial support sleeve is used to be inserted into the first bearing and supported. The inner part of the inner race of the bearing; the radial annular portion is used to abut against the outer end wall of the inner race and has an outer peripheral edge and an inner side annular wall, and a first gap is formed between the outer peripheral edge and the inner peripheral annular wall of the first five-way bowl; a first axial inner sealing component has a clamping portion and a sealing portion extending from the clamping portion; the clamping portion can be nested on the inner peripheral annular wall of the first five-way bowl, and is clamped between the annular bottom wall and the inner end wall of the outer race; the sealing portion has a sealing end edge, which can elastically resist and seal against the opposite portion of the outer annular wall of the axial support sleeve of the first sealing protective member. The five-way bowl assembly as described in claim 1 further includes a first axial external sealing component, which is used to be nested on the inner circumferential wall of the first five-way bowl and abut against the outer end wall of the outer seat ring of the first bearing, and has an outer peripheral sealing end edge, an inner peripheral sealing end edge, and an annular recess between the outer peripheral sealing end edge and the inner peripheral sealing end edge protruding along the axial outer side; the inner side wall of the first sealing protective component protrudes an annular protrusion inwardly along the radial middle section; the outer peripheral sealing end edge can be elastically abutted against the first sealing protective component The radial annular portion of the first sealing protective member is disposed on the inner annular wall of the outer periphery of the annular protrusion to form a first sealing structure; the inner peripheral sealing end edge can be elastically pressed against the radial annular portion of the first sealing protective member on the inner annular wall of the inner periphery of the annular protrusion to form a second sealing structure; the inner annular wall of the first sealing protective member protrudes inwardly along the radial middle portion thereof to form an annular protrusion, which can be accommodated in the annular recess, and a second gap is formed between them, and a labyrinth structure can be formed between the first sealing structure and the second sealing structure. The bottom bracket cup assembly as described in claim 1, wherein the clamped portion of the first axial inner sealing member has an inner end wall for abutting against the annular bottom wall of the first bottom bracket cup, an outer end wall for abutting against the inner end wall of the outer race, and an outer annular wall for being embedded in the inner circumferential wall of the first bottom bracket cup; the first axial inner sealing member includes a body member made of elastic material, and a support plate connected to the inner end side of the body member and made of metal material; the body member is used to form most of the clamped portion and the sealing portion; the support plate is used to form at least a portion of the inner end wall of the clamped portion, which can be affixed to the annular bottom wall of the first bottom bracket cup. The five-way bowl assembly as described in claim 2, wherein the first axial external sealing component has an inner end wall for abutting against the outer end wall of the outer seat ring, the inner end wall of the first five-way bowl annular bottom wall, an outer annular wall for being nested in the inner circumferential wall of the first five-way bowl, and an outer end wall for protruding the outer peripheral sealing end edge, the inner peripheral sealing end edge and the annular recess; the first axial external sealing component The component includes a main body component made of elastic material and a support plate connected to the inner end side of the main body component and made of metal material; the main body component is used to form the first axial external sealing component including the outer peripheral sealing end edge, the inner peripheral sealing end edge and the majority of the annular recess; the support plate is used to form at least a part of the inner side end wall of the first axial external sealing component, which can be attached to the outer end wall of the outer seat ring. The five-way bowl assembly as described in claim 1 further includes: a second five-way bowl having a bearing mounting portion, the bearing mounting portion having a mounting annular groove opening outward, the mounting annular groove having an inner peripheral wall and an annular bottom wall; a second bearing having an outer race, an inner race, and a plurality of rollers mounted in the outer race and the inner race; the outer race can be nested in the mounting annular groove of the second five-way bowl; a second sealing protective member having an axial support sleeve connected thereto, and a radially outwardly extending portion extending from the outer end of the axial support sleeve. The radial ring portion is a radial ring portion extending in an integral manner to the side; the axial support sleeve portion is used to be sleeved and supported inside the inner race of the second bearing; the radial ring portion is used to abut against the outer end wall of the inner race and has an outer peripheral edge and an inner ring wall, the outer peripheral edge and the inner ring wall of the second five-way bowl form a first gap between each other, and the inner ring wall protrudes inwardly along the radial middle section thereof with an annular protrusion; a second axial inner sealing component has a clamping portion and a sealing portion extending integrally from the clamping portion; the clamping portion can be nested in The inner circumferential wall of the second five-way bowl is clamped between the annular bottom wall and the inner end wall of the outer seat ring; the sealing portion has a sealing end edge, which can elastically resist and seal against the corresponding portion of the outer circumferential wall of the axial support sleeve of the second sealing protective member; a second axial external sealing member is used to be nested on the inner circumferential wall of the second five-way bowl and abut against the outer end wall of the outer seat ring of the second bearing, and an outer sealing end edge, an inner sealing end edge, and a sealing member located between the outer sealing end edge and the inner sealing end edge protrude along the axial outer side. The outer sealing end edge can be elastically pressed against the radial annular portion of the second sealing protective member on the inner annular wall of the outer periphery of the annular protrusion to form a first sealing structure; the inner sealing end edge can be elastically pressed against the radial annular portion of the second sealing protective member on the inner annular wall of the inner periphery of the annular protrusion to form a second sealing structure; the annular recess can be used to accommodate the annular protrusion, and a second gap is formed between them, and a labyrinth structure can be formed between the first sealing structure and the second sealing structure. As described in claim 5, the clamped portion of the second axial inner sealing member has an inner end wall for abutting against the annular bottom wall of the second bottom bowl, an outer end wall for abutting against the inner end wall of the outer race, and an outer annular wall for embedding in the inner circumferential wall of the second bottom bowl; the second axial inner sealing member includes a body member made of elastic material, and a support plate connected to the inner end side of the body member and made of metal material; the body member is used to form most of the clamped portion and the sealing portion; the support plate is used to form at least a portion of the inner end wall of the clamped portion, which can be affixed to the annular bottom wall of the second bottom bowl. The five-way bowl assembly as described in claim 5, wherein the second axial external sealing component has an inner end wall for abutting against the outer end wall of the outer seat ring, the inner end wall of the second five-way bowl annular bottom wall, an outer annular wall for being nested in the inner circumferential wall of the second five-way bowl, and an outer end wall for protruding the outer peripheral sealing end edge, the inner peripheral sealing end edge and the annular recess; the second axial external sealing component The component includes a main body component made of elastic material and a support plate connected to the inner end side of the main body component and made of metal material; the main body component is used to form the second axial external sealing component including the outer peripheral sealing end edge, the inner peripheral sealing end edge and most of the annular recess; the support plate is used to form at least a part of the inner side end wall of the second axial external sealing component, which can be attached to the outer end wall of the outer seat ring. As described in claim 5, the first five-way bowl has a screw-locking portion connected to the bearing mounting portion, which is used to screw and lock the inner part of one of the two opposite ends of a five-way tube; the second five-way bowl has a screw-locking portion connected to the bearing mounting portion, which is used to screw and lock the inner part of the other of the two opposite ends of the five-way tube. The bottom bracket cup set as described in claim 8, wherein the first bottom bracket cup can be pressed into and positioned inside one of the two opposite ends of the bottom bracket tube; the second bottom bracket cup can be pressed into and positioned inside the other of the two opposite ends of the bottom bracket tube. As described in claim 9, the first bottom bracket has a screw-locking portion connected to the bearing mounting portion; the second bottom bracket has a screw-locking portion connected to the bearing mounting portion, which is used to be screwed and locked to the screw-locking portion of the first bottom bracket.

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