TWI648191B - A bottom bracket of a bicycle - Google Patents

Abstract

The invention relates to a bicycle five-way bowl comprising a shaft tube and at least one bearing seat. The shaft tube is disposed through a five-way pipe, and the shaft tube includes at least one first thread segment; the at least one bearing block is disposed on the shaft tube, and each of the bearing blocks includes a first thread segment corresponding to the first thread segment In combination with one of the second thread segments, wherein the first thread segment includes a plurality of threads, and the angle between any one of the adjacent two threads is defined as a thread angle, and the thread angle is less than 40 degrees.

Description

Bicycle five-way bowl

The invention relates to a five-way bowl of bicycles, in particular to a five-way bowl of bicycles.

When the bicycle is riding, the various components cooperate with each other, and the bottom brackets (B.B, also referred to as the five-way bowl) occupy a very important position, which is the largest source of support when the pedal is rotated. The stable structure of the five-way bowl can improve the smoothness of the pedaling and effectively transmit the pedaling force. Therefore, how to improve the stability of the five-way bowl and the five-way tube, reduce the noise, and effectively waterproof to avoid rust, and other target bicycle manufacturers are mainly focused on research and development, in order to make the five-way bowl more durable and possess Better performance.

According to the different assembly methods of the five-way bowl, it can be divided into many types, such as press-in type, lock-type type, and so on. Among them, due to the wide applicability, convenient assembly and quick replacement of the lock-type five-way bowl, it is widely loved by users. In order to further enhance the overall function of the lock-type five-way bowl, it is necessary to provide a novel and progressive five-way bicycle set.

The main object of the present invention is to provide a five-way bicycle set for a bicycle, which can provide a better screwing force between the bearing seat and the shaft tube, so that the two have a relatively stable joint structure, thereby improving the overall operational stability and performance.

To achieve the above object, the present invention provides a five-way bicycle set for a bicycle, comprising: a shaft tube and at least one bearing seat. The shaft tube is disposed through a five-way pipe, and the shaft tube includes at least one first thread segment; the at least one bearing block is disposed on the shaft tube, and each of the bearing blocks includes a first thread segment corresponding to the first thread segment In combination with one of the second thread segments, wherein the first thread segment includes a plurality of threads, and the angle between any one of the adjacent two threads is defined as a thread angle, and the thread angle is less than 40 degrees.

The following is a description of the possible embodiments of the present invention, and is not intended to limit the scope of the invention as claimed.

Referring to FIGS. 1 through 5, there is shown a preferred embodiment of the present invention. The bicycle five-way bowl includes a shaft tube 1 and at least one bearing block 5.

The shaft tube 1 is disposed through a five-way pipe, and the shaft tube 1 includes at least one first thread segment 6; the at least one bearing block 5 is disposed on the shaft tube 1, and each of the bearing blocks 5 includes The first thread segments 6 correspond to one of the second thread segments 7 in correspondence with each other. The first thread segment 6 includes a plurality of threaded teeth 61. The angle between any one of the adjacent two threaded teeth 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 five-way bowl group is a pair of lock type, and the lock type can be subdivided into two pieces and three pieces according to the number of the bearing blocks 5, in the embodiment, the at least The number of one bearing block 5 and the number of the at least one first thread segment 6 are each one, that is, the five-way bowl set of the two-piece pair lock is described in the embodiment.

It can be understood that the specification of the second thread segment 7 is matched with the specification of the first thread segment 6, and therefore, only the structure of the first thread segment 6 is explained here.

In the present invention, by limiting the thread angle 64 to 40 degrees or less, the cross-sectional profile of the thread 61 is substantially trapezoidal, and the thread 61 of the trapezoidal section is compared with the equilateral triangle of the thread of the general thread. A crest 63 has a large cross section, can have a relatively rigid structure to effectively resist the force and is not easy to collapse, so when at least one of the shaft tube 1 and the at least one bearing seat 5 is made of a plastic material (In the present embodiment, the shaft tube 1 and each of the bearing housings 5 are made of a plastic material), and the thread 61 of the plastic material can have a long service life and is not easily collapsed through the above-mentioned structural design, and can be lightly balanced. Quantity and durability. The thread angle 64 is preferably between 10 and 30 degrees after actual use measurement comparison, and can simultaneously maintain better rotational smoothness and structural strength, for example, but not limited to, the thread angle 64 in this embodiment. It is 24 ± 1 degree.

Moreover, the thread 61 having a trapezoidal cross section enables the first threaded section 6 and the second threaded section 7 to be screwed to each other, and the opposing teeth 62 of the threaded teeth 61 are tapered to each other. The bearing block 5 can be stably coupled to the shaft tube 1 because it is not easy to loosen and has a strong degree of bonding.

In addition, the pitch of the first thread segment 6 is preferably greater than 1.2 mm, so that each of the screw teeth 61 can have a larger space to be sized to match the different use of the target material with appropriate structural strength. Preferably, the ratio of the pitch of the first thread segment 6 to the crest 63 of the screw 61 is between 2 and 4 to ensure that each of the threaded teeth 61 produced by the machine has at least a certain structural strength. And can have a clearer processing benchmark for planning and design. In this embodiment, the target object is the shaft tube 1 of the five-way bowl set, so the pitch of the first thread segment 6 is designed to be 1.8 mm, and the length of the crest 63 of each of the screws 61 is 0.6. Mm, and have a more appropriate use strength.

Further, in the extending direction of the shaft tube 1, the length of the first thread segment 6 is preferably greater than 10 mm to ensure that the entire first thread segment 6 and the second thread segment 7 have more joint area. And a stable combination. Furthermore, the length of the second thread segment 7 is greater than the length of the first thread segment 6, so that the five-way bowl has sufficient margin for elongation or shortening to match the five-way tube of different lengths. In the present embodiment, the first threaded section 6 is an externally threaded section, and the second threaded section 7 is an internally threaded section.

In addition to the above, the shaft tube 1A and the bearing housing 5A may be further illustrated in another embodiment of FIGS. 6 and 7 , wherein the shaft tube 1 further includes at least one third thread segment 8 , the third The threaded section 8 and the first threaded section 6 are respectively disposed on the inner and outer walls of the same section of the shaft tube 1A, and each of the bearing housings 5A further includes a corresponding combination with the first threaded section 6 a fourth threaded section 9 , the second threaded section 7 and the fourth threaded section 9 are correspondingly disposed on the inner and outer walls of the same section of the bearing housing 5A; wherein, when the bearing housing 5A is assembled on the shaft tube 1A, the first thread segment 6 and the second thread segment 7 are screwed to each other, and the third thread segment 8 and the fourth thread segment 9 are screwed together, thereby greatly lifting the bearing housing 5A and the shaft tube 1A. The strength of the bond.

Referring to the embodiment shown in FIG. 1 to FIG. 5, the shaft tube 1 preferably further includes at least one stopping 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 stopper portion 4 blocks the bearing housing 5 to ensure that the shaft tube 1 does not excessively penetrate the bearing housing 5 to eject the bearing.

More specifically, the shaft tube 1 further includes a main body 2 for the inside of the five-way tube. The main body 2 includes a first diameter section 21 and a second diameter section 22, and the second diameter section 22 is larger than the first section A diameter section 21, the first thread section 6 is disposed on the first diameter section 21. The first diameter segment 21 and the second diameter segment 22 form a stepped joint to form the blocking portion 4, and the highest height of the thread 61 of the first thread segment 6 is relatively higher than the second diameter. The outer surface of the segment 22, the portion of the second thread segment 7 and the blocking portion 4 are in an interference relationship with the direction in which the shaft tube 1 extends.

More specifically, the shaft tube 1 further includes a bearing portion 3, the first thread segment 6 and the bearing portion 3 are disposed at opposite ends of the main body 2, and the first thread segment 6 is one of the main body 2 The end face 23 extends toward the bearing portion 3, wherein the bearing portion 3 and the bearing block 5 are laterally clamped against the five-way pipe.

Preferably, the minimum tube thickness of the main body 2 is greater than 1.5 mm to ensure a relatively strong structural bearing force. In this embodiment, the first diameter section 21 has a tube thickness of 1.9 mm, and the second diameter section The tube thickness of 22 is 2.2 mm, and the stopper portion 4 is spaced apart from the first thread portion 6, and the portion of the bearing portion 3 that is coupled to the main body 2 is inclined.

In summary, the bicycle five-way bowl of the present invention improves the thread angle, so that the thread made of plastic is trapezoidal to maintain excellent structural strength, so that the screw can have a better service life. Moreover, at the same time, the pitch size is limited to at least 1.2 mm, so that the screw can have sufficient space for dimension planning, and a thicker section can resist the external force and is not easy to break.

1, 1A‧‧‧ shaft tube

2‧‧‧ Subject

21‧‧‧First path

22‧‧‧Second section

23‧‧‧ end face

3‧‧‧ Bearing Department

4‧‧‧stops

5, 5A‧‧‧ bearing housing

6‧‧‧First thread segment

61‧‧‧ thread

62‧‧‧ tooth surface

63‧‧‧Top

64‧‧‧thread angle

7‧‧‧second thread segment

8‧‧‧ third thread segment

9‧‧‧fourth thread segment

1 is a perspective view of an embodiment of the present invention. Figure 2 is an exploded view of Figure 1. Figure 3 is a cross-sectional view of Figure 1. Figure 4 is a cross-sectional view of Figure 2. Figure 5 is a partial enlarged view of Figure 4. Figure 6 is a cross-sectional view showing another embodiment of the present invention. Figure 7 is an exploded cross-sectional view showing another embodiment of the present invention.

Claims (8)

A five-way bicycle set includes: a shaft tube for passing through a five-way tube, comprising at least one first thread segment; at least one bearing seat disposed on the shaft tube, each of the bearing housings comprising The first thread segments are coupled to each other to a second thread segment; wherein the first thread segment includes a plurality of thread teeth, and an angle between any one of the adjacent two screw teeth is defined as a thread angle, the thread angle The shaft tube and the at least one bearing seat are made of a plastic material; wherein the at least one bearing seat is sleeved on the shaft tube, and a part of the shaft tube is inserted into the bearing seat, The shaft tube further includes at least one stopping portion, the at least one stopping portion is radially protruded from the shaft tube, and when the bearing housing is positioned at a predetermined position of the shaft tube, the extension of the shaft tube In the direction, the stopping portion blocks the bearing seat, and the shaft tube is not pressed against the bearing of the bearing seat in the extending direction thereof. The bicycle five-way bowl set according to claim 1, wherein the thread angle is between 10 degrees and 30 degrees. The bicycle five-way bowl set according to claim 1, wherein the length of the first thread segment is greater than 10 mm in the extending direction of the shaft tube. The bicycle five-way bowl set according to claim 1, wherein the first thread segment has a pitch greater than 1.2 mm. The bicycle five-way bowl set according to claim 1, wherein the shaft tube further comprises a body for being located in the five-way pipe, the body comprising a first diameter section and a second diameter section, the second diameter The segment is larger than the first diameter segment, and the first thread segment is disposed on the first diameter segment. The bicycle five-way bowl set according to claim 1, wherein the shaft tube further comprises a supply position The body of the body of the five-way pipe has a minimum pipe thickness of more than 1.5 mm. The bicycle five-way bowl set according to claim 1, wherein the shaft tube further comprises at least one third thread segment, wherein the third thread segment and the first thread segment are correspondingly disposed on the shaft tube. Each of the inner and outer walls of the same section further includes a fourth threaded section corresponding to the first threaded section, and the second threaded section and the fourth threaded section are correspondingly disposed on the bearing An inner and outer wall of the same section of the seat; wherein, when the bearing block is disposed on the shaft tube, the first thread segment and the second thread segment are screwed to each other, and the third thread segment and the fourth thread segment are mutually Screwed. The bicycle five-way bowl set according to claim 5, wherein the thread angle is between 10 degrees and 30 degrees; and the length of the first thread segment is greater than 10 mm in the extending direction of the shaft tube; a thread segment having a pitch greater than 1.2 mm; the shaft tube further comprising a body for being located in the five-way tube, the main tube having a minimum tube thickness greater than 1.5 mm; the threaded portion of the thread having a trapezoidal shape, each of the threaded teeth The length of the crest is 0.6 mm; the number of the at least one bearing seat and the number of the at least one first thread segment are each; the length of the second thread segment is greater than the length of the first thread segment; the shaft tube further comprises a bearing portion, the first thread segment and the bearing portion are disposed at opposite ends of the body, the first thread segment extending from an end surface of the body toward the bearing portion; the stopping portion and the first thread segment The portion of the bearing portion that is coupled to the main body is inclined; the bearing portion and the bearing housing are laterally clamped against the five-way pipe; the first diameter segment and the second diameter segment are connected in a stepped manner Forming the stop portion; the highest height of the thread of the first thread segment The first thread segment is an external thread segment, and the second thread segment is an internal thread segment; the first thread segment has a pitch of 1.8 mm, and the first diameter segment The tube thickness is 1.9 mm, and the tube diameter of the second diameter section is 2.2 mm; the ratio of the pitch of the first thread segment to the crest of the screw is between 2 and 4.