TW202003311A - A bottom bracket of a bicycle - Google Patents

Abstract

A bottom bracket of a bicycle is provided, including an axle tube and at least one bearing base. The axle tube is adapted for being inserted into a bracket pipe. The axle tube includes at least one first threaded section. The at least one bearing base is assembled to the axle tube. Each of the at least one bearing base includes a second threaded section which is connected with the first threaded section. The first threaded section includes a plurality of threads. Every neighboring two of the plurality of threads define a thread angle. The thread angle is less than 40 degrees.

Description

Bicycle five-way bowl set

The invention relates to a bicycle five-way bowl set, in particular to a bicycle five-way bowl set.

When the bicycle is riding, the various components cooperate with each other. The bottom brackets (B.B, also known as the bottom bracket) occupy a very important position, which is the largest source of support when pedaling and turning. The five-way bowl with stable structure can improve the smoothness of pedaling and effectively transmit the pedaling force. Therefore, how to improve the stability of the five-way bowl set and the five-way tube, reduce abnormal noise, and effectively waterproof to avoid rust is one of the main research and development focuses of the bicycle industry, in order to make the five-way bowl set more durable and possess Better performance.

According to the different assembly methods of the five-way bowl set, it can be divided into many types, such as press-in type, pair lock type... Among them, because of the wide applicability of the lock type five-way bowl set, the convenience of assembly and the rapid disassembly and other advantages, it is widely loved by users. In order to further improve the overall function of the lock-type five-way bowl set, it is necessary to provide a novel and progressive bicycle five-way bowl set.

The main purpose of the present invention is to provide a bicycle five-way bowl set, which can provide a better screwing force between the bearing seat and the axle tube, so that the two have a more stable connection structure, and thereby improve the overall operation stability and performance.

To achieve the above object, the present invention provides a bicycle five-way bowl set, including: an axle tube and at least one bearing seat. The shaft tube is provided for passing through a five-way tube, the shaft tube includes at least one first threaded segment; the at least one bearing seat is disposed on the shaft tube, and each bearing seat includes a correspondence with the first threaded segment In combination with a second thread segment; wherein, the first thread segment includes a plurality of threads, and the included angle defined by any tooth surface of any two adjacent threads is defined as a thread angle, and the thread angle is less than 40 degrees.

The following merely illustrates the possible implementation forms of the present invention with examples, but it is not intended to limit the scope of the invention to be protected, and will be described first.

Please refer to FIGS. 1 to 5, which show a preferred embodiment of the present invention. The bicycle five-way bowl set of the present invention includes an axle tube 1 and at least one bearing seat 5.

The shaft tube 1 is provided for passing through a five-way tube. The shaft tube 1 includes at least one first threaded section 6; the at least one bearing housing 5 is disposed on the shaft tube 1. Each bearing housing 5 includes The first thread segment 6 is combined with one of the second thread segments 7 corresponding to each other. Wherein, the first thread segment 6 includes a plurality of threads 61, and the angle between any tooth surface 62 of any two adjacent threads 61 is defined as a thread angle 64, and the thread angle 64 is less than 40 degrees.

It can be seen from the above that the appearance of the five-way bowl group belongs to the pair-lock type, and the pair-lock type can be subdivided into a two-piece type and a three-piece type according to the number of the bearing seats 5, in this embodiment, the at least The number of a bearing seat 5 and the number of the at least one first threaded section 6 are each one, that is to say, in this embodiment, the five-way bowl set of a two-piece pair lock is used as an illustration.

It can be understood that the specifications of the second thread segment 7 match the specifications corresponding to the first thread segment 6, therefore, only the structure of the first thread segment 6 will be explained here.

In the present invention, by limiting the thread angle 64 to below 40 degrees, the cross-sectional profile of the thread 61 is generally trapezoidal. Compared with the general thread of the thread is an equilateral triangle, the thread 61 of the trapezoidal cross-section A crest 63 has a larger cross-section and can have a harder structure to effectively resist the force and not easily collapse, so when at least one of the shaft tube 1 and the at least one bearing seat 5 is made of plastic material (In this embodiment, the shaft tube 1 and each bearing seat 5 are made of plastic material). The screw 61 made of plastic material can have a long service life and is not easy to collapse through the above structural design. Quantity and durability. After actual use measurement and comparison, the thread angle 64 is preferably between 10 degrees and 30 degrees, which can simultaneously maintain a better rotational smoothness and structural strength, for example but not limited to the thread angle 64 in this embodiment It is 24±1 degrees.

Moreover, the thread 61 with a trapezoidal cross-section can make the tooth surfaces 62 of the two opposing threads 61 closely adhere to each other when the first thread segment 6 and the second thread segment 7 are screwed to each other, having The advantages of not easy to loosen and strong coupling make the bearing seat 5 can connect the shaft tube 1 stably.

In addition, the pitch of the first thread section 6 is preferably greater than 1.2 mm, so that each of the screw teeth 61 can have a larger space to specify the size, so as to match the different objects and have appropriate structural strength. Preferably, the ratio of the pitch of the first thread segment 6 to the crest 63 of the thread 61 is between 2 and 4, to ensure that each thread 61 produced and processed has at least a certain structural strength , And can have clearer processing standards for planning and design. In this embodiment, the applied object is the shaft tube 1 of the five-way bowl set, so the pitch of the first thread section 6 is designed to be 1.8 mm, and the length of the crest 63 of each thread 61 is approximately 0.6 mm, and there is a more appropriate use strength.

Furthermore, in the extending direction of the shaft tube 1, the length of the first threaded section 6 is preferably greater than 10 mm to ensure that the entire first threaded section 6 and the second threaded section 7 have more joint area And stable combination. Furthermore, the length of the second threaded section 7 is greater than the length of the first threaded section 6, in order to allow the five-way bowl set to have sufficient margin to extend or shorten to fit the five-way pipes of different lengths. In this embodiment, the first thread segment 6 is an external thread segment, and the second thread segment 7 is an internal thread segment.

In addition to the above-mentioned aspects, the shaft tube 1A and the bearing housing 5A shown in another embodiment of FIG. 6 and FIG. 7 may also be included, wherein the shaft tube 1 further includes at least a third threaded section 8, the third The threaded section 8 and the first threaded section 6 are respectively located on the inner and outer walls of the same section of the shaft tube 1A, and each of the bearing seats 5A further includes a first correspondingly combined with the first threaded section 6 Four threaded segments 9, the second threaded segment 7 and the fourth threaded segment 9 are respectively arranged on the inner and outer walls of the same section of the bearing housing 5A; wherein, when the bearing housing 5A is arranged on the shaft tube At 1A, the first threaded section 6 and the second threaded section 7 are screwed to each other, and the third threaded section 8 and the fourth threaded section 9 are screwed to each other, thereby greatly enhancing the bearing seat 5A and the shaft tube 1A The bonding strength.

Please refer to this embodiment shown in FIG. 1 to FIG. 5 again. The shaft tube 1 preferably further includes at least one stop portion 4. When the bearing housing 5 is positioned at a predetermined position of the shaft tube 1, In the extending direction of the shaft tube 1, the blocking portion 4 blocks the bearing seat 5 to ensure that the shaft tube 1 does not excessively penetrate into the bearing seat 5 to eject the bearing.

More specifically, the shaft tube 1 further includes a main body 2 for being located in the five-way tube, the main body 2 includes a first diameter section 21 and a second diameter section 22, the second diameter section 22 is larger than the first A diameter section 21, the first threaded section 6 is disposed on the first diameter section 21. Wherein, the stop portion 4 is formed at the stepped connection between the first diameter section 21 and the second diameter section 22, and the highest height of the thread 61 of the first thread section 6 is relatively higher than the second diameter On the outer surface of the segment 22, the portion of the second threaded segment 7 and the stopper 4 are in an interference relationship in the extending direction of the shaft tube 1.

More specifically, the shaft tube 1 further includes a bearing portion 3, the first threaded section 6 and the bearing portion 3 are provided at opposite ends of the body 2, the first threaded section 6 is formed by one of the body 2 The end surface 23 extends toward the bearing portion 3, wherein the bearing portion 3 and the bearing seat 5 are provided for lateral clamping against the five-way pipe.

Preferably, the minimum tube thickness of the main body 2 is greater than 1.5 mm to ensure that a stronger structure can bear the force. In this embodiment, the tube thickness of the first diameter section 21 is 1.9 mm and the second diameter section The tube thickness of 22 is 2.2 mm, and the stop portion 4 is spaced from the first thread segment 6, and the portion where the bearing portion 3 and the main body 2 are connected is inclined.

In summary, the five-way bowl set of the bicycle of the present invention improves the thread angle, so that the screw teeth made of plastic are generally trapezoidal to maintain excellent structural strength, so that the screw teeth can have a better service life. Moreover, at the same time, limit the pitch size to at least greater than 1.2mm, so that the thread can have enough space for size planning, and can have a thicker section to resist external forces and not easy to break.

1,1A‧‧‧Shaft tube 2‧‧‧Body 21‧‧‧First diameter section 22‧‧‧Second diameter section 23‧‧‧End face 3‧‧‧Bearing part 4‧‧‧Block part 5,5A ‧‧‧Bearing seat 6‧‧‧First thread segment 61‧‧‧Thread 62‧‧‧Face 63‧‧‧Tooth crest 64‧‧‧Thread angle 7‧‧‧Second thread segment 8‧‧‧ Three thread segments 9‧‧‧ Fourth thread segment

FIG. 1 is a perspective view of an embodiment of the invention. Fig. 2 is an exploded view of Fig. 1. FIG. 3 is a cross-sectional view of FIG. 1. FIG. 4 is a cross-sectional view of FIG. 2. FIG. 5 is a partially enlarged view of FIG. 4. 6 is a cross-sectional view of another embodiment of the invention. 7 is an exploded cross-sectional view of another embodiment of the invention.

1‧‧‧Shaft tube

2‧‧‧Main

21‧‧‧The first diameter section

22‧‧‧The second diameter section

23‧‧‧End

3‧‧‧Bearing Department

4‧‧‧stop

5‧‧‧Bearing

6‧‧‧The first thread section

7‧‧‧Second thread section

Claims (10)

A five-way bowl set for bicycles includes: a shaft tube for passing through a five-way tube, including at least a first threaded section; at least one bearing seat, assembled on the shaft tube, each bearing seat including The first thread segment corresponds to a second thread segment corresponding to each other; wherein, the first thread segment includes a plurality of threads, and the included angle defined by any tooth surface of any two adjacent threads is defined as a thread angle, and the thread angle Department is less than 40 degrees. The five-way bowl set for a bicycle according to claim 1, wherein the thread angle is between 10 degrees and 30 degrees. The five-way bowl set for a bicycle according to claim 1, wherein at least one of the shaft tube and the at least one bearing seat is made of plastic material. The five-way bowl set of the bicycle according to claim 1, wherein the length of the first threaded section is greater than 10 mm in the extending direction of the axle tube. The five-way bowl set for a bicycle according to claim 1, wherein the pitch of the first threaded section is greater than 1.2 mm. The five-way bowl set for a bicycle according to claim 1, wherein the axle tube further includes a body for being located in the five-way tube, the body includes a first diameter section and a second diameter section, the second diameter The segment is larger than the first diameter segment, and the first threaded segment is disposed on the first diameter segment. The five-way bowl set for a bicycle according to claim 1, wherein the axle tube further includes a main body for being located in the five-way tube, and the minimum tube thickness of the main body is greater than 1.5 mm. The five-way bowl set for a bicycle according to claim 1, wherein the axle tube further includes at least a third threaded section, the third threaded section and the first threaded section are respectively located on the axle tube In the inner and outer walls of the same section, each of the bearing seats further includes a fourth thread segment correspondingly combined with the first thread segment, and the second thread segment and the fourth thread segment are respectively located in the bearing correspondingly The inner and outer walls of the same section of the seat; wherein, when the bearing seat is arranged on the shaft tube, the first threaded section and the second threaded section are screwed to each other, the third threaded section and the fourth threaded section are mutually Screwed. The five-way bowl set for a bicycle according to any one of claims 1 to 8, wherein the axle tube further includes at least one stop portion, when the bearing seat is positioned at a predetermined position of the axle tube, In the extending direction of the shaft tube, the blocking portion blocks the bearing seat. The five-way bowl set for a bicycle according to claim 6, wherein the thread angle is between 10 degrees and 30 degrees; at least one of the shaft tube and the at least one bearing seat is made of plastic material; In the extending direction of the shaft tube, the length of the first threaded section is greater than 10mm; the pitch of the first threaded section is greater than 1.2mm; the shaft tube further includes a body for being located in the five-way tube, and the smallest tube of the body The thickness is greater than 1.5mm; the shaft tube further includes at least one stop portion, when the bearing seat is positioned at a preset position of the shaft tube, the stop portion blocks the bearing in the extending direction of the shaft tube Seat; the cross-sectional profile of the thread is generally trapezoidal, the length of the crest of each thread is approximately 0.6mm; the number of the at least one bearing seat and the number of the at least one first thread segment are each one; the second thread The length of the segment is greater than the length of the first threaded segment; the shaft tube further includes a bearing portion, the first threaded segment and the bearing portion are provided at opposite ends of the body, the first threaded segment is formed by one of the body The end surface extends toward the bearing portion; the stop portion is spaced from the first thread segment; the portion where the bearing portion and the main body are connected is inclined; the bearing portion and the bearing seat are provided for lateral clamping against the five Through pipe; the first diameter section and the second diameter section are formed in a stepped connection at the stop portion; the highest height of the thread of the first thread section is relatively higher than the outer surface of the second diameter section; the first One thread segment is an external thread segment, the second thread segment is an internal thread segment; the pitch of the first thread segment is approximately 1.8 mm, the pipe thickness of the first diameter segment is 1.9 mm, and the second diameter segment is The tube thickness is 2.2 mm; the ratio of the pitch of the first thread segment to the crest of the thread is between 2 and 4.

Images