阅读说明：本技术 一种中轴机构及自行车 (Middle shaft mechanism and bicycle ) 是由 于同福 孙海林 杜菲 刘笑凯 于 2021-08-25 设计创作，主要内容包括：本发明属于自行车零部件技术领域,公开一种中轴机构及自行车,中轴机构包括车架、中轴、第一转动件、第三限位件和第二转动件,中轴贯穿车架,中轴上设置有第一限位件和第二限位件,第一转动件用于支撑中轴一端的转动,第二转动件用于支撑中轴另一端的转动,第三限位件位于第二限位件远离第一限位件的一侧,第三限位件与车架连接以限制第一转动件和第二转动件的轴向移动；自行车包括上述的中轴机构。中轴机构取消五通管和一侧的丝碗,直接将中轴安装于车架上,第三限位件配合车架对第一转动件和第二转动件进行轴向限位,结构简单,进而简化了自行车的装配操作。(The invention belongs to the technical field of bicycle parts and discloses a middle shaft mechanism and a bicycle, wherein the middle shaft mechanism comprises a frame, a middle shaft, a first rotating part, a third limiting part and a second rotating part, the middle shaft penetrates through the frame, the middle shaft is provided with the first limiting part and the second limiting part, the first rotating part is used for supporting the rotation of one end of the middle shaft, the second rotating part is used for supporting the rotation of the other end of the middle shaft, the third limiting part is positioned on one side, away from the first limiting part, of the second limiting part, and the third limiting part is connected with the frame so as to limit the axial movement of the first rotating part and the second rotating part; the bicycle comprises the middle shaft mechanism. The bottom bracket mechanism cancels the five-way pipe and the screw bowl on one side, the bottom bracket is directly arranged on the frame, the third limiting part is matched with the frame to axially limit the first rotating part and the second rotating part, the structure is simple, and the assembly operation of the bicycle is simplified.)

1. A bottom bracket mechanism, comprising:

a frame (1);

the middle shaft (2) penetrates through the frame (1), and a first limiting piece (21) and a second limiting piece (22) are arranged on the middle shaft (2);

the first rotating part (3) is used for supporting the rotation of the middle shaft (2), the inner ring of the first rotating part (3) is sleeved on the middle shaft (2) along the radial direction of the middle shaft (2), the outer ring of the first rotating part is abutted against the frame (1), one side of the first rotating part (3) is abutted against the frame (1) along the axial direction of the middle shaft (2), and the other side of the first rotating part is abutted against the first limiting part (21);

the third limiting piece (4) is positioned on one side, away from the first limiting piece (21), of the second limiting piece (22), the third limiting piece (4) is connected with the frame (1), and the middle shaft (2) penetrates through the third limiting piece (4);

the second rotates piece (5), is used for supporting the rotation of axis (2), follows radially, the inner circle cover that the second rotated piece (5) is located axis (2), outer lane butt third locating part (4), follow the axial of axis (2), one side butt that the second rotated piece (5) third locating part (4), opposite side butt second locating part (22).

2. The bottom bracket mechanism as claimed in claim 1, characterized in that the frame (1) has a first recess (111), the bottom of the first recess (111) has a first through hole (112), the first rotating member (3) is embedded in the first recess (111), and the bottom bracket (2) penetrates through the first rotating member (3) and the first through hole (112).

3. The bottom bracket mechanism as claimed in claim 2, characterized in that the first rotating member (3) is configured as a ball rack, and the bottom of the first recess (111) is configured as a cambered surface.

4. The bottom bracket mechanism as claimed in claim 1, wherein the third limiting member (4) is configured as a screw cup, the frame (1) is provided with a screw thread, the screw cup is connected to the frame (1) through the screw thread, and the second rotating member (5) is embedded in the screw cup.

5. The bottom bracket mechanism as claimed in claim 1, wherein the third limiting member (4) is configured as a limiting plate, and the frame (1) and the limiting plate clamp the first rotating member (3) and the second rotating member (5) to limit the axial movement of the first rotating member (3) and the second rotating member (5) along the bottom bracket (2).

6. The bottom bracket mechanism as claimed in claim 5, characterized in that the third limiting member (4) has a second groove (41), the bottom of the second groove (41) has a second through hole (42), the second rotating member (5) is inserted into the second groove (41), and the bottom bracket (2) passes through the second rotating member (5) and the second through hole (42).

7. The bottom bracket mechanism as claimed in claim 6, characterized in that the second rotation element (5) is configured as a ball rack, and the bottom of the second recess (41) is configured as a cambered surface.

8. The bottom bracket mechanism as claimed in claim 1, characterized in that the first stop element (21) and the second stop element (22) are each provided as a shoulder, which is integrally formed with the bottom bracket (2).

9. A bicycle, comprising a bottom bracket mechanism as defined in any one of claims 1 to 8.

Technical Field

The invention relates to the technical field of bicycle parts, in particular to a middle shaft mechanism and a bicycle.

Background

In recent years, bicycles have become important transportation tools for people to go out in short distance due to the characteristics of economy, convenience, energy conservation and environmental protection. In the prior art, a bottom bracket mechanism is generally used as a bearing part of a bottom bracket, namely the bottom bracket is welded on a frame, and then the bottom bracket is rotatably arranged on the bottom bracket through a ball frame and a screw bowl, so that the structure is complex, and further the assembly operation is complex; and the left and right screw thread directions of the five-way pipe are opposite, when the five-way pipe is welded on the frame, if the orientation of the five-way pipe is reversed, the risk of scrapping parts exists.

Based on the above situation, it is desired to design a bottom bracket mechanism and a bicycle to solve the above problems.

Disclosure of Invention

One object of the present invention is: the middle shaft mechanism is provided, a five-way pipe is omitted, and the structure is simple.

Another object of the invention is: the bicycle comprises the middle shaft mechanism, and the middle shaft mechanism is simple in structure, so that the assembling operation of the bicycle is simplified.

In order to achieve the purpose, the invention adopts the following technical scheme:

in one aspect, a bottom bracket mechanism is provided, comprising:

a frame;

the middle shaft penetrates through the frame, and a first limiting piece and a second limiting piece are arranged on the middle shaft;

the first rotating part is used for supporting the rotation of the middle shaft, an inner ring of the first rotating part is sleeved on the middle shaft, an outer ring of the first rotating part is abutted against the frame, one side of the first rotating part is abutted against the frame along the axial direction of the middle shaft, and the other side of the first rotating part is abutted against the first limiting part;

the third limiting piece is positioned on one side, far away from the first limiting piece, of the second limiting piece, the third limiting piece is connected with the frame, and the middle shaft penetrates through the third limiting piece;

the second rotating part is used for supporting the rotation of the central shaft, and the second rotating part is radially sleeved on the central shaft, the outer ring of the second rotating part is abutted to the third limiting part, the second rotating part is axially abutted to the third limiting part on one side, and the second limiting part is abutted to the other side.

As a preferable scheme, a first groove is formed in the frame, a first through hole is formed in the bottom of the first groove, the first rotating member is embedded in the first groove, and the middle shaft penetrates through the first rotating member and the first through hole.

Preferably, the first rotating member is a ball rack, and the bottom of the first groove is an arc surface.

As a preferred scheme, the third limiting part is a screw bowl, a screw thread is arranged on the frame, the screw bowl is connected to the frame through the screw thread, and the second rotating part is embedded in the screw bowl.

As a preferable scheme, the third limiting member is configured as a limiting plate, and the frame and the limiting plate clamp the first rotating member and the second rotating member to limit the axial movement of the first rotating member and the second rotating member along the central axis.

As a preferable scheme, a second groove is formed in the third limiting member, a second through hole is formed in the bottom of the second groove, the second rotating member is embedded in the second groove, and the middle shaft penetrates through the second rotating member and the second through hole.

As a preferable scheme, the second rotating member is configured as a ball rack, and the bottom of the second groove is configured as an arc surface.

As a preferred scheme, the first limiting part and the second limiting part are both arranged as shaft shoulders, and the shaft shoulders and the middle shaft are integrally formed.

In another aspect, a bicycle is also disclosed, which comprises the above bottom bracket mechanism.

The invention has the beneficial effects that: the middle shaft mechanism is provided with a five-way pipe and a screw bowl on one side, the middle shaft directly penetrates through a frame and a third limiting piece, a first rotating piece and a second rotating piece respectively support the rotation of two ends of the middle shaft, the middle shaft is penetrated through from one side of the frame close to the third limiting piece, and the third limiting piece is matched with the frame to axially limit the first rotating piece and the second rotating piece; the bicycle comprises the middle shaft mechanism, so that the assembling operation of the bicycle is simplified.

Drawings

The invention is explained in more detail below with reference to the figures and examples.

FIG. 1 is an exploded schematic view of a bottom bracket mechanism of the prior art;

fig. 2 is a first view of the third limiting member being a limiting plate according to the embodiment;

fig. 3 is a second perspective view of the third limiting member being a limiting plate according to the embodiment;

fig. 4 is an exploded view illustrating the third limiting member being a wire bowl according to the embodiment.

In fig. 1 to 4:

1. a frame; 11. a sheet metal frame; 111. a first groove; 112. a first through hole; 12. a framework;

2. a middle shaft; 21. a first limit piece; 22. a second limiting member;

3. a first rotating member;

4. a third limiting member; 41. a second groove; 42. a second through hole;

5. a second rotating member;

61. a five-way pipe; 62. silk bowl; 63. covering with threads; 64. a ball rack.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1, in the prior art, a five-way pipe 61 is generally used as a bearing part of a central shaft, and a screw bowl 62 and a cover screw 63 on the left and right sides are required to be installed in a matching manner, so that the structure is complex. During assembly, the right screw bowl 62 is screwed down, the middle shaft penetrates through the ball frame 64, the five-way pipe 61 is further penetrated, the left screw bowl 62 is screwed down, and the left cover screw 63 is screwed down, so that the assembly operation is complex and the efficiency is low. In order to solve the above problems, the present embodiment provides a bottom bracket mechanism, which omits the five-way tube 61, directly mounts the bottom bracket on the frame, has a simple structure, and simplifies the assembly operation.

As shown in fig. 2 and fig. 3, specifically, the middle axle mechanism includes a frame 1, a middle axle 2, a first rotating member 3, a third limiting member 4, and a second rotating member 5, the frame 1 includes a frame 12 and a sheet metal frame 11, the sheet metal frame 11 is welded on the frame 12, and the middle axle 2 penetrates through the sheet metal frame 11; the first rotating part 3 is a bearing part, the first rotating part 3 is sleeved on the middle shaft 2, the outer ring of the first rotating part 3 is abutted against the frame 1, and the first rotating part 3 is limited between the sheet metal frame 11 and the first limiting part 21 along the axial direction of the middle shaft 2; the third limiting part 4 is positioned on one side of the second limiting part 22 far away from the first limiting part 21, the third limiting part 4 is connected with the sheet metal frame 11, and the central shaft 2 penetrates through the third limiting part 4; the second rotating member 5 is also a bearing-type part, the second rotating member 5 is sleeved on the central shaft 2, an outer ring of the second rotating member 5 abuts against the third limiting member 4, and the second rotating member 5 is limited between the third limiting member 4 and the second limiting member 22 along the axial direction of the central shaft 2. It can be understood that axis 2 directly runs through sheet metal frame 11 to use the spacing first rotation piece 3 of sheet metal frame 11, cancelled the five-way pipe and the silk bowl of this side, then use third locating part 4 to connect on sheet metal frame 11 to spacing simultaneously to first rotation piece 3 and second rotation piece 5, simple structure. During the assembly, only need wear to establish first rotation piece 3 and second rotation piece 5 with axis 2, and then penetrate panel beating frame 11 with axis 2 from panel beating frame 11 near one side of third locating part 4, be fixed in panel beating frame 11 with third locating part 4 again at last can, easy operation does not have the risk that the five-way pipe adorns anti-positively moreover.

In this embodiment, the frame 1 is provided with a first groove 111, specifically, the sheet metal frame 11 is provided with a first groove 111, the bottom of the first groove 111 is provided with a first through hole 112, the first rotating member 3 is sleeved on the middle shaft 2 and is embedded in the first groove 111, it can be understood that the first groove 111 abuts against the outer ring and the side wall of the first rotating member 3, and the middle shaft 2 penetrates through the first through hole 112, so that the structure is simple. In other embodiments of the present invention, an annular boss may be welded to the opening of the first through hole 112 to limit the axial movement of the first rotating member 3.

In this embodiment, the first rotating member 3 is a ball rack, the bottom of the first groove 111 is a cambered surface, and when the ball rack is embedded in the first groove 111, the bottom of the cambered surface can match the shape of the balls of the ball rack, thereby improving the structural stability. In other embodiments of the present invention, the first rotating member 3 may also be configured as a deep groove ball bearing, an outer ring of the deep groove ball bearing abuts against the groove bottom, and an inner ring is sleeved on the middle shaft 2 and is not in contact with the frame 1, which can also achieve the effect of reducing friction force.

As shown in fig. 2 and fig. 3, in this embodiment, the third limiting part 4 is set as a limiting plate, the upper portion of the sheet metal frame 11 is C-shaped, the lower portion of the sheet metal frame 11 is welded and fixed to the framework 12, the limiting plate is connected with the sheet metal frame 11 through a bolt, the first rotating part 3 and the second rotating part 5 are sleeved on the central shaft 2, the first rotating part 3 is located between the first limiting part 21 and the sheet metal frame 11, the second rotating part 5 is located between the second limiting part 22 and the limiting plate, thereby rotatably supporting two ends of the central shaft 2, and the limiting plate is connected with the sheet metal frame 11 to axially limit the first rotating part 3 and the second rotating part 5. When the middle shaft mechanism is assembled, the first rotating piece 3 and the second rotating piece 5 are sleeved on the middle shaft 2, the middle shaft 2 penetrates through the sheet metal frame 11, and finally the limiting plate is connected to the sheet metal frame 11 through the bolt, so that the assembling operation is simplified.

As a preferred embodiment, the third limiting member 4 is provided with a second groove 41, a second through hole 42 is provided at the bottom of the second groove 41, and the second rotating member 5 is sleeved on the middle shaft 2 and is embedded in the second groove 41, it can be understood that the second groove 41 abuts against the outer ring and the side wall of the second rotating member 5 at the same time, and the middle shaft 2 penetrates through the second through hole 42, so the structure is simple. In other embodiments of the present invention, an annular boss may be welded to the opening of the second through hole 42 to restrict the axial movement of the second rotating member 5.

Specifically, the second rotating member 5 is a ball frame, the bottom of the second groove 41 is a cambered surface, and when the ball frame is embedded in the second groove 41, the bottom of the cambered surface can match the shape of the balls of the ball frame, so that the structural stability is improved. In other embodiments of the present invention, the second rotating member 5 may also be configured as a deep groove ball bearing, an outer ring of the deep groove ball bearing abuts against the groove bottom, and an inner ring of the deep groove ball bearing is sleeved on the middle shaft 2 and is not in contact with the third limiting member 4, which can also achieve the effect of reducing friction force.

As shown in fig. 4, in other embodiments, the third limiting member 4 is configured as a screw bowl, the frame 1 is provided with a screw thread, the screw thread has a structure similar to that of the threaded through hole, the second rotating member 5 is embedded in the screw bowl, and the screw bowl is inserted into the frame 1 and connected to the frame 1 through the screw thread, at this time, the assembly structure of the frame 1, the second rotating member 5 and the screw bowl is substantially the same as that of the five-way pipe, the second rotating member 5 and the screw bowl in the prior art. And the lid silk is still installed in the outside of silk bowl, can prevent the not hard up of silk bowl, has improved the reliability.

In this embodiment, the first limiting member 21 and the second limiting member 22 are shaft shoulders, the first rotating member 3 and the second rotating member 5 are sleeved on the central shaft 2 and located at two sides of the two shaft shoulders which are deviated from each other, and the shaft shoulders and the central shaft 2 are integrally formed, so that the manufacturing is simple. In other embodiments of the present invention, the two limit rings may be separately fixed to the bottom bracket 2 by using screws or welding, so as to achieve the same function.

The embodiment also provides a bicycle comprising the middle axle mechanism, and it can be understood that the middle axle mechanism omits a bottom bracket tube, directly installs the middle axle 2 on the frame 1, has a simple structure, and further simplifies the assembling operation of the bicycle, and the bicycle described in the embodiment includes but is not limited to an electric bicycle or a bicycle.

In the description herein, it is to be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.