Integrally-formed hollow 3D printing crank

Abstract

The utility model discloses an integrally-formed hollow type 3D printing crank which comprises a crank middle shaft, middle shaft splines, a connecting hole, a left side crank body, a left side spline groove, a left side fastening bolt, a right side crank body, a right side bolt, a limiting cover and a mounting groove. The connecting holes are formed in the left end and the right end of the crank middle shaft respectively, the left side crank is provided with a left side spline groove, the left side spline groove is installed on the crank middle shaft through a left side middle shaft spline, the left side fastening bolt is installed in the left side connecting hole through the left side crank, and the right side crank is installed on the right side of the crank middle shaft. The right bolt is installed in the right connecting hole through the right crank, the limiting cover is installed on the right crank through the right bolt, and the installation grooves are formed in the outer side of the left crank and the outer side of the right crank respectively. According to the titanium alloy crank, the titanium alloy crank which is graceful, high in integrity, low in manufacturing and machining difficulty and light in weight is manufactured through the 3D printing technology.

Description

Technical Field

[0001] The utility model relates to a bicycle component, in particular to an integrally formed hollow 3D printed crank. Background Art

[0002] Although titanium alloy bicycles and bicycle accessories are highly sought after and favored by people, the production of titanium alloy bicycle frames and bicycle accessories is not as simple as that of traditional material bicycle frames, because titanium alloy materials have high hardness, and the current existing processing technology is difficult to complete a lighter and more beautiful cavity structure under the premise of ensuring the strength of the parts. In particular, titanium alloy cranks are more difficult to process, and it is difficult to produce a titanium alloy crank that takes into account appearance, strength and lightness. However, in the high-end bicycle market, consumers are more interested in bicycles made of titanium alloy, so a titanium alloy crank with a more beautiful shape, stronger integrity, lower manufacturing and processing difficulty and lighter weight has become a strong demand of consumers and titanium alloy bicycle manufacturers. Utility Model Content

[0003] The purpose of the utility model is to provide an integrally formed hollow 3D printed crank to solve the above technical problems.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an integrally formed hollow 3D printed crank, comprising a crank shaft, a shaft spline, a connecting hole, a left crank, a left spline groove, a left fastening bolt, a right crank, a right bolt, a limiting cover, and a mounting groove, wherein the left and right sides of the crank shaft side ends are respectively installed on the shaft spline, and the connecting holes are respectively opened at the left and right ends of the crank shaft, the left crank is opened with a left spline groove, and the left spline groove is installed on the crank shaft through the left shaft spline, the left fastening bolt is installed in the left connecting hole through the left crank, the right crank is installed on the right side of the crank shaft, the right bolt is installed in the right connecting hole through the right crank, the limiting cover is installed on the right crank through the right bolt, and the mounting grooves are respectively opened on the outside of the left crank and the right crank.

[0005] Based on the above technical solution, the right crank includes a crank, a right spline groove, a toothed plate spline, and a limit cover groove. The crank is opened with a right spline groove, and the crank is installed on the crank center shaft through the right spline groove and the right center shaft spline, and the right bolt is connected to the right connecting hole through the right spline groove. The toothed plate spline is opened at the right spline groove at the inner end of the crank, the limit cover groove is opened outside the right spline groove, and the limit cover is installed on the crank through the limit cover groove.

[0006] Based on the above technical solution, the crank is connected to the bicycle sprocket through a sprocket spline.

[0007] Based on the above technical solution, the left crank and the right crank are hollow thin-walled structures.

[0008] Compared with the prior art, the utility model has the following advantages: the utility model is more beautiful and advanced in design through 3D printing technology, and is more convenient to manufacture. The one-piece hollow 3D printed crank adopts a fuller and smoother design, and a large number of cavity structures are used, which can greatly reduce the waste of materials and further reduce the weight. The design of the one-piece hollow 3D printed crank can omit the positioning tooling during the traditional manufacturing method, and greatly reduce the time spent by workers in the debugging and positioning tooling stage during the production process, thereby achieving the purpose of rapid production and efficient production. The design of the one-piece hollow 3D printed crank is highly integrated, which can cover and satisfy a rich group of high-end consumers, and can meet the customization or mass production needs of road bicycle products. After the one-piece hollow 3D printed crank is printed and the support is removed, there is no other more complicated processing steps, and there is no need to adopt the traditional material reduction processing method, which greatly reduces the loss of raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the appearance structure of the utility model.

[0010] Figure 2 This is a schematic diagram of the connection point structure of the utility model.

[0011] Figure 3 It is a schematic diagram of the right crank structure of the utility model.

[0012] Figure 4 It is a schematic diagram of the right crank structure of the utility model.

[0013] In the figure: 1. crank shaft, 2. shaft spline, 3. connecting hole, 4. left crank, 5. left spline groove, 6. left fastening bolt, 7. right crank, 8. left bolt, 9. limit cover, 10. mounting groove, 11. crank, 12. right spline groove, 13. gear plate spline, 14. limit cover groove. DETAILED DESCRIPTION

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] like Figures 1 to 3As shown, an integrally formed hollow 3D printed crank comprises a crank shaft 1, a shaft spline 2, a connecting hole 3, a left crank 4, a left spline groove 5, a left fastening bolt 6, a right crank 7, a right bolt 8, a limiting cover 9, and a mounting groove 10. The left and right sides of the side ends of the crank shaft 1 are respectively mounted on the shaft spline 2, the connecting holes 3 are respectively opened at the left and right ends of the crank shaft 1, the left crank 4 is opened with a left spline groove 5, and the left spline groove 5 is installed on the crank shaft 1 through the left shaft spline 2, the left fastening bolt 6 is installed in the left connecting hole 3 through the left crank 4, the right crank 7 is installed on the right side of the crank shaft 1, the right bolt 8 is installed in the right connecting hole 3 through the right crank 7, the limiting cover 9 is installed on the right crank 7 through the right bolt 8, and the mounting grooves 10 are respectively opened on the outside of the left crank 4 and the right crank 7.

[0016] The right crank 7 includes a crank 11, a right spline groove 12, a toothed plate spline 13, and a limit cover groove 14. The crank 11 is provided with a right spline groove 12, and the crank 11 is installed on the crank center shaft 1 through the right center shaft spline 2 via the right spline groove 12, and the right bolt 8 is connected to the right connecting hole 3 through the right spline groove 12. The toothed plate spline 13 is opened at the right spline groove 12 at the inner end of the crank 11, the limit cover groove 14 is opened outside the right spline groove 12, and the limit cover 9 is installed on the crank 11 through the limit cover groove 14.

[0017] The crank 11 is connected to the bicycle sprocket via a sprocket spline 13 .

[0018] The left crank 4 and the right crank 7 are hollow thin-walled structures.

[0019] The working principle of the utility model is as follows: the left crank 4 is installed on the left side of the crank shaft 1, and the left fastening bolt 6 is used to fix the left crank 4 on the crank shaft 1, the right crank 7 is installed on the right side of the crank shaft 1, and the right crank bolt 8 is used to fix the right crank 7 on the crank shaft 1, and then the limit cover 9 is installed on the outside of the right bolt 8 to facilitate the disassembly of the right crank 6. The crank shaft 1, the left crank 4, and the right crank 7 are all formed by 3D printing technology to reduce the working time of the CNC machining center. The left fastening bolt 6, the right bolt 8, and the limit cover are all rotating body structures with small size and low processing difficulty, which can greatly reduce the loss of material cost and the consumption of processing time.

[0020] The above is a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of the present invention.

Claims

1. An integrally formed hollow 3D printed crank, comprising a crank center shaft (1), a center shaft spline (2), a connecting hole (3), a left crank (4), a left spline groove (5), a left fastening bolt (6), a right crank (7), a right bolt (8), a limit cover (9), and a mounting groove (10), characterized in that: The left and right sides of the side ends of the crank shaft (1) are respectively mounted on the shaft splines (2); the connecting holes (3) are respectively opened on the left and right ends of the crank shaft (1); the left crank (4) is provided with a left spline groove (5), and the left spline groove (5) is mounted on the crank shaft (1) through the left shaft splines (2); the left fastening bolt (6) is mounted on the left connecting hole (3) through the left crank (4); the right crank (7) is mounted on the right side of the crank shaft (1); the right bolt (8) is mounted on the right connecting hole (3) through the right crank (7); the limit cover (9) is mounted on the right crank (7) through the right bolt (8); and the mounting grooves (10) are respectively opened on the outside of the left crank (4) and the right crank (7).

2. The one-piece hollow 3D printed crank according to claim 1, characterized in that: The right crank (7) comprises a crank (11), a right spline groove (12), a toothed disc spline (13), and a limit cover groove (14); the crank (11) is provided with a right spline groove (12), and the crank (11) is installed on the crank center shaft (1) through the right spline groove (12) and the right center shaft spline (2); the right bolt (8) is connected to the right connecting hole (3) through the right spline groove (12); the toothed disc spline (13) is opened at the right spline groove (12) at the inner end of the crank (11); the limit cover groove (14) is opened outside the right spline groove (12), and the limit cover (9) is installed on the crank (11) through the limit cover groove (14).

3. The one-piece hollow 3D printed crank according to claim 1, characterized in that: The crank (11) is connected to the bicycle gearwheel via a gearwheel spline (13).

4. The one-piece hollow 3D printed crank according to claim 1, characterized in that: The left crank (4) and the right crank (7) are hollow thin-wall structures.

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