Durable die plate crank

Abstract

The utility model provides durable type tooth disc crank relates to tooth disc crank technical field, including crank, the fixed mounting seat has at least three mounting convex position on the crank, tooth disc spare, including first tooth disc piece, second tooth disc piece and third tooth disc piece, first tooth disc piece, second tooth disc piece and third tooth disc piece all can be connected in the mounting seat of dismantling, positioning piece, when first tooth disc piece and second tooth disc piece install on the mounting seat, through positioning piece carries out preposition, the utility model discloses realizes preposition through the embedding of first positioning rod and positioning column, and the relative position of second tooth disc piece, mounting seat and first tooth disc piece is limited fast, avoids assembly deviation, and the combination connection mode of hollow inserting post and fastening screw guarantees the firmness of connection, and realizes axial limit through convex ring structure, and simultaneously, the second positioning rod of third tooth disc piece and positioning hole cooperate design, further improve assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the field of crank chainring technology, and in particular to a durable crank chainring. Background Technology

[0002] As the core transmission component of cycling equipment such as bicycles and electric bicycles, the chainring crank plays a crucial role in transmitting the pedaling force of the rider's legs to the wheels. Its structural stability and durability directly affect the riding experience, transmission efficiency, and equipment lifespan. In daily riding scenarios, the chainring crank must withstand high-frequency periodic loads, torsional forces, and the impact of road bumps for a long time. It also faces the erosion of external environments such as dust, water vapor, and mud. Therefore, it has extremely high requirements for its structural strength, connection reliability, and wear resistance.

[0003] Existing cranksets mostly adopt an integral or simple splicing structure design, which has some problems that urgently need to be solved. The traditional connection method between the chainring and the mounting base is mostly a single bolt fastening, which lacks a pre-positioning structure. When tightening the bolt, it is necessary to hold it in place by hand, which makes the chainring prone to displacement and misalignment during assembly. This not only increases the assembly difficulty, but also makes the stress distribution uneven. After long-term use, bolts are prone to loosening, chainring deformation or even breakage. Based on this, a durable crankset is proposed. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model proposes a durable crank crank.

[0005] The technical solution of this utility model is implemented as follows:

[0006] Durable chainring cranks include:

[0007] A crank, on which a mounting base is fixed, the mounting base having at least three mounting protrusions;

[0008] The chainring assembly includes a first chainring plate, a second chainring plate, and a third chainring plate, all of which are detachably connected to the mounting base.

[0009] The positioning element is used to pre-position the first and second chainrings when they are installed on the mounting base, and the first and second chainrings and the mounting base are connected by a combination connector.

[0010] Preferably, the positioning element includes:

[0011] The first positioning rod is fixed at one end to the second toothed plate;

[0012] A positioning post is fixed through the first toothed disc, and the positioning post has an axial groove.

[0013] Preferably, the combined connector includes a hollow insert and a first fastening screw. The hollow insert has an axially threaded groove and can pass through the mounting base, the first toothed plate, and the second toothed plate.

[0014] Preferably, the outer end of the hollow insert is integrally formed with a convex ring, the diameter of which is larger than the inner diameter of the corresponding through hole on the second tooth plate.

[0015] Preferably, a second positioning rod is connected to the third toothed plate, and a corresponding positioning hole is provided on the mounting base.

[0016] Preferably, a second fastening screw is provided on the third toothed plate, and the end of the second fastening screw can be screwed into the mounting base.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This utility model achieves pre-positioning through the engagement of the first positioning rod and the positioning post, quickly defining the relative positions of the second toothed plate, the mounting base, and the first toothed plate, thus avoiding assembly misalignment. The combination connection method of the hollow insert post and the fastening screw not only ensures the firmness of the connection but also achieves axial limitation through the convex ring structure, preventing the connecting parts from loosening during use. At the same time, the design of the second positioning rod and the positioning hole of the third toothed plate further simplifies the assembly process and improves assembly efficiency.

[0019] 2. This utility model adopts a multi-piece detachable structure design. The first, second, and third chainrings can all be disassembled and installed independently. When a single chainring is worn or damaged, only the corresponding part needs to be replaced, without replacing the whole chainring. This greatly reduces maintenance costs and improves resource utilization. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This utility model Figure 1 A structural diagram from another angle;

[0023] Figure 3 This is a schematic diagram of the exploded structure of this utility model;

[0024] Figure 4 This is a structural schematic diagram of the crank, mounting base, combined connector and positioning component of this utility model in a combined state;

[0025] Figure 5 This is a structural schematic diagram of the crank, mounting base, and combined connecting component of this utility model in their separated states;

[0026] Figure 6 This utility model Figure 5 Enlarged diagram of point A in the diagram.

[0027] In the diagram: 1. Crank; 2. Mounting base; 3. First chainring; 31. First mounting part; 4. Second chainring; 41. Second mounting part; 5. Third chainring; 6. Combined connector; 61. Hollow insert; 62. First fastening screw; 7. Positioning element; 71. First positioning rod; 72. Positioning pin; 73. Groove; 8. Second positioning rod; 9. Second fastening screw. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figures 1-6As shown, the durable crankset includes a crank 1, a chainring assembly, and a positioning component 7. A mounting base 2 is fixed to the crank 1. Specifically, one end of the crank 1 and the mounting base 2 are connected using an integrated fixing process, improving the structural strength and stability of the connection. This effectively resists repeated torsional and impact forces during long-term riding, preventing loosening or breakage under prolonged stress. The mounting base 2 has at least three mounting protrusions. To ensure the balanced force and stability of the chainring assembly after installation, four mounting protrusions are preferentially provided. These four mounting protrusions are arranged in a circular array on the end face of the mounting base 2, using an integrated... The molding process simplifies the production process and enhances the overall structural strength of the mounting base 2, making it suitable for high-frequency, high-load transmission scenarios and meeting durability requirements. The chainring assembly includes a first chainring 3, a second chainring 4, and a third chainring 5, arranged in descending order of diameter to form a stepped structure. This stepped multi-chainring design, combined with the derailleur, allows for gear shifting, matching the transmission needs of different speeds and resistance scenarios such as high-speed riding on flat roads, uphill riding with heavy loads, and riding against the wind, thus improving power output efficiency and riding comfort. The first chainring 3, second chainring 4, and third chainring 5 are all detachably connected to the mounting protrusions on the mounting base 2. This connection structure is stable and reliable, effectively preventing chainring shifting or detachment during riding. Each chainring 3, 4, and 5 features multiple evenly distributed notches. The notch design was optimized using finite element analysis. Based on precise calculations of the key stress points on the chainrings, the notches were strategically placed to avoid core stress areas. This effectively reduces the overall weight of the chainring components while ensuring the core structural strength and transmission rigidity remain unaffected. To reduce the ineffective load during riding, improve riding flexibility and range, and enhance the ventilation and heat dissipation performance of the chainring, reducing the degradation of material properties caused by frictional heat generation during long-term high-speed transmission, the first chainring 3 and the second chainring 4 are pre-positioned by the positioning member 7 when installed on the mounting base 2, and the first chainring 3, the second chainring 4 and the mounting base 2 are connected by the combination connector 6. The mounting protrusion is provided with a recessed groove to accommodate the first mounting part 31 of the first chainring 3, and the second chainring 4 is provided with a second mounting part 41 corresponding to the first mounting part 31.

[0030] Among them, see Figures 3-6 As shown, the positioning component 7 includes a first positioning rod 71 and a positioning post 72. One end of the first positioning rod 71 is fixed to the second toothed plate 4, and the positioning post 72 is fixed to the first toothed plate 3 through the first toothed plate 3. The positioning post 72 has an axial groove 73.

[0031] See Figures 4-6As shown, the combined connector 6 includes a hollow insert 61 and a first fastening screw 62. The hollow insert 61 has an axially fitted threaded groove that matches the first fastening screw 62. The hollow insert 61 can pass through the corresponding pre-set through holes on the mounting base 2, the first toothed plate 3, and the second toothed plate 4 in sequence along the axial direction to achieve preliminary coaxial positioning of the three. A convex ring structure is integrally formed at the outer end of the hollow insert 61. The diameter of the convex ring is larger than the inner diameter of the corresponding through hole on the second toothed plate 4. This structural design allows the convex ring to fit tightly against the outer surface of the second toothed plate 4, thereby providing axial limiting for the hollow insert 61 and preventing excessive penetration during assembly or use.

[0032] As described above, when assembling the first chainring 3 and the second chainring 4, the first mounting part 31 of the first chainring 3 is first aligned with the pre-set groove of the mounting protrusion, and smoothly inserted and fitted into place. This completes the initial positioning of the first chainring 3 on one side of the mounting base 2. Then, the second chainring 4 is assembled from the other side of the mounting base 2. At this time, the first positioning rod 71 on the second chainring 4 needs to be inserted into the positioning post 72 where the corresponding groove 73 is opened on the first chainring 3. This directly and initially defines the relative positions of the mounting base 2, the first chainring 3, and the second chainring 4, effectively avoiding... To prevent misalignment or displacement during assembly, a precise positional reference is provided for subsequent fastening processes. After the positions of the three components are initially fixed, the combined connector 6 is taken, and its hollow insert 61 is inserted sequentially through the corresponding assembly holes on the second toothed plate 4, the mounting base 2, and the first toothed plate 3 along the preset assembly direction, ensuring that the hollow insert 61 is fully inserted. Finally, the first fastening screw 62 is screwed into the side of the second toothed plate 4 away from the mounting base 2 and tightened into the preset threaded groove of the hollow insert 61 until the preset tightening torque is reached, thus completing the stable assembly of the three components. Relying on the limiting effect of the first positioning rod 71 and the positioning post 72, the operator does not need to manually hold the components to fix their positions during the fastening operation of the combined connector 6, which not only reduces the assembly difficulty but also significantly improves the overall assembly efficiency.

[0033] See Figures 1-4 As shown, a second positioning rod 8 is connected to the third toothed plate 5, and a corresponding positioning hole is provided on the mounting base 2. A second fastening screw 9 is passed through the third toothed plate 5, and the end of the second fastening screw 9 can be screwed into the mounting base 2.

[0034] As described above, when installing the third chainring plate 5, the operator can first align the second positioning rod 8 on the third chainring plate 5 and insert it into the positioning hole of the mounting base 2 to complete the initial positioning and limiting of the third chainring plate 5. During the subsequent tightening of the second fastening screw 9, the third chainring plate 5 can always maintain a stable installation state without the operator having to manually support it for positioning. This effectively avoids installation deviations caused by unstable manual support and improves the convenience and efficiency of the installation operation.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A durable crankset, characterized in that, include: A crank (1) is fixed with a mounting seat (2), the mounting seat (2) having at least three mounting protrusions; The chainring assembly includes a first chainring plate (3), a second chainring plate (4), and a third chainring plate (5), all of which are detachably connected to the mounting base (2). The positioning element (7) is used to pre-position the first toothed plate (3) and the second toothed plate (4) when they are mounted on the mounting base (2), and the first toothed plate (3), the second toothed plate (4) and the mounting base (2) are connected by a combination connector (6).

2. The durable crankset according to claim 1, characterized in that: The positioning element (7) includes: The first positioning rod (71) is fixed at one end to the second tooth plate (4); A positioning post (72) is fixed through the first tooth plate (3), and the positioning post (72) has an axial groove (73).

3. The durable crankset according to claim 1, characterized in that: The combined connector (6) includes a hollow insert (61) and a first fastening screw (62). The hollow insert (61) has a threaded groove in the axial direction and can pass through the mounting base (2), the first toothed plate (3) and the second toothed plate (4).

4. The durable crankset according to claim 3, characterized in that: The outer end of the hollow insert (61) is integrally formed with a convex ring, the diameter of which is larger than the inner diameter of the corresponding through hole on the second tooth plate (4).

5. The durable crankset according to claim 1, characterized in that: The third tooth plate (5) is connected to a second positioning rod (8), and the mounting base (2) is provided with a corresponding positioning hole.

6. The durable crankset according to claim 1, characterized in that: The third tooth plate (5) is provided with a second fastening screw (9), the end of which can be screwed into the mounting base (2).

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