A die plate crank assembly

Abstract

The utility model provides a toothed disc crank assembly relates to bicycle accessory technical field, including toothed disc part, the toothed disc part includes the axial connection part for connecting the frame, the peripheral surface fixed connection of axial connection part has toothed disc body, and the peripheral surface still is connected with the crank piece of axial connection part, toothed disc body is between two crank pieces, the axial of toothed disc body presents ring array and is opened with a plurality of positioning hole, the utility model discloses the setting of positioning hole, positioning rod, connecting ring, convex tooth and screw ring, in use, positioning rod is inserted into positioning hole and forms the primary positioning, subsequently through the screw thread of screw ring and positioning rod is screwed and completes the fastening connection of convex tooth and connecting ring, when needing to replace convex tooth or connecting ring, only needs to unscrew and takes down screw ring, can integrally dismantle positioning rod, convex tooth and connecting ring, thereby the modularization maintenance of toothed disc assembly has been realized, does not need to replace toothed disc assembly as a whole, has reduced the maintenance difficulty, improved maintenance efficiency.

Description

Technical Field

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

[0002] The crankset assembly (also known as the crank group or chainring assembly) is the core component of a bicycle's drivetrain, consisting of crank arms, chainrings, and bottom bracket (spindle). Its core function is to convert the linear motion generated by the rider pedaling into the rotational motion of the chainrings, which then drives the rear wheel forward via the chain. This process involves the four-bar linkage principle in mechanical engineering, where energy is transferred through the coordinated movement of the crankshaft, connecting rods, and chainrings. The crank arms are the components that connect the pedals and the bottom bracket. They are usually installed in pairs on both sides of the bottom bracket and are made of materials including steel, aluminum alloy, titanium alloy, and carbon fiber. The chainrings are toothed discs that mesh with the chain to transmit power. The number of teeth directly affects the gear ratio. The bottom bracket is the bearing assembly that connects the cranks to the frame. There are threaded bottom brackets and press-fit bottom brackets. According to the number of chainrings, they can be divided into single chainrings, double chainrings, and triple chainrings. Single chainrings are common on mountain bikes and gravel bikes, eliminating the front derailleur and simplifying the drivetrain. Double chainrings are commonly used in the mainstream configuration of road bikes, providing a wider gear ratio range. Triple chainrings were often used in older standards and are now only found on entry-level models. According to the installation method, there are direct-mount and conventional types. Direct-mount uses chainrings that are directly fixed to the bottom bracket (common in single chainring systems), while conventional uses chainrings that are fixed to the crank arms via chainring claws (double / triple chainring systems). Although the existing devices can perform transmission, the existing gears are all one-piece structures. When one of the teeth is damaged, the entire gear has to be replaced, which is not only difficult and inefficient to replace, but also increases the cost of use in the long run. Utility Model Content

[0003] To address the shortcomings of the existing technology, this utility model proposes a crankset assembly.

[0004] The technical solution of this utility model is implemented as follows:

[0005] A crankset assembly includes a crankset component. The crankset component includes an axial connecting portion for connecting to a frame. A crankset body is fixedly connected to the circumferential surface of the axial connecting portion, and a crank component is also connected to the circumferential surface of the axial connecting portion. The crankset body is located between two crank components. The crankset body has multiple positioning holes arranged in a circular array along its axial direction. A detachable positioning rod is installed inside each positioning hole. A connecting ring is fixedly connected between the multiple positioning rods. Multiple mounting holes are formed on the side of the crankset body away from the connecting ring. Multiple teeth for connecting a chain are fixedly connected in a circular array on the outer circumferential surface of the connecting ring. The mounting holes communicate with the positioning holes, and a detachable threaded ring is screwed onto the positioning rod, with the threaded ring located inside the mounting hole.

[0006] Preferably, the axial connection portion includes a plug rod, one end of which is open to form a cross groove, and a detachable cross rod is provided inside the cross groove. A connector is fixedly connected to the end of the cross rod away from the plug rod, and a detachable first limiting rod is screwed onto one end of the plug rod. The telescopic end of the first limiting rod extends into the cross groove to clamp the cross rod.

[0007] Preferably, the axial surface of the crank body has multiple through lightweight holes, and the insert is located between the multiple lightweight holes.

[0008] Preferably, the crank component includes a collar, the crank body is fixedly connected to the circumferential surface of the collar, and a detachable second limiting rod is screwed onto the circumferential surface of the collar, the free end of the second limiting rod extending into the collar to clamp the connector or insert.

[0009] Preferably, the circumferential surfaces of the insertion rod and the connector are recessed to form side holes, which match the second limiting rod.

[0010] Preferably, the cross bar is recessed inward along its length to form a side groove.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. This utility model, through the setting of positioning holes, positioning rods, connecting rings, protruding teeth, and threaded rings, allows for initial positioning when the positioning rod is inserted into the positioning hole. Subsequently, the threaded ring engages with the positioning rod to complete the fastening connection between the protruding teeth and the connecting ring. When it is necessary to replace the protruding teeth or the connecting ring, simply loosen and remove the threaded ring to disassemble the positioning rod, protruding teeth, and connecting ring as a whole. This achieves modular maintenance of the crankset assembly, eliminating the need to replace the entire crankset assembly, reducing maintenance difficulty, and improving maintenance efficiency.

[0013] 2. This utility model, through the setting of a cross rod, a cross groove, and a first limiting rod, allows for continuous adjustment of the extension distance of the connector by sliding the cross rod axially within the cross groove during use. After adjustment to a suitable position, the first limiting rod is rotated to press its end against the surface of the cross rod, achieving reliable locking through friction. This enables compatibility and adaptation with different frame sizes, further expanding the application range of the device. Attached Figure Description

[0014] 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.

[0015] Figure 1 This is one of the perspective views of this utility model;

[0016] Figure 2 This is a second perspective view of the present invention;

[0017] Figure 3 This is one of the perspective views of the toothed disc component of this utility model;

[0018] Figure 4 This is the second perspective view of the toothed disc component of this utility model;

[0019] Figure 5 This is a perspective view of the crank component of this utility model;

[0020] In the diagram: 1. Crankset component; 11. Crankset body; 12. Positioning hole; 13. Lightweight drilling; 14. Threaded ring; 15. Insert rod; 16. Cross groove; 17. First limiting rod; 18. Connecting ring; 19. Raised tooth; 110. Positioning rod; 111. Cross rod; 112. Side groove; 113. Connector; 114. Side hole; 115. Mounting hole; 2. Crankset component; 21. Crankset body; 22. Collar; 23. Second limiting rod. Detailed Implementation

[0021] 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.

[0022] like Figures 1-5 As shown, the present invention provides a crankset assembly, including a crankset 1. The crankset 1 includes an axial connecting portion for connecting to the frame. A crankset body 11 is fixedly connected to the circumferential surface of the axial connecting portion, and a crankset 2 is also connected to the circumferential surface of the axial connecting portion. The crankset body 11 is located between two cranksets 2. The crankset body 11 has multiple positioning holes 12 arranged in a circular array along its axial direction. Each positioning hole 12 has a detachable positioning rod 110 installed inside it. A connecting ring 18 is fixedly connected between the multiple positioning rods 110. Multiple mounting holes 115 are formed on the side of the crankset body 11 away from the connecting ring 18. Multiple teeth 19 for connecting the chain are fixedly connected in a circular array on the outer circumferential surface of the connecting ring 18. The mounting holes 115 communicate with the positioning holes 12, and a detachable threaded ring 14 is screwed onto the positioning rod 110. The threaded ring 14 is located inside the mounting hole 115.

[0023] With the above technical solution, when using the device, the axial connecting part is inserted into the frame, and then the axial connecting part is connected to the bearing connecting lug on the frame. The positioning rod 110 is then inserted into the positioning hole 12, so that the connecting ring 18 is tightly against the chainring body 11. The threaded ring 14 is placed in the mounting hole 115 and screwed into the positioning rod 110, thereby fixing the connecting ring 18 and the tooth 19 onto the chainring body 11. The crank component 2 drives the chainring body 11 to rotate around the frame. When the tooth 19 needs to be replaced... At 9 o'clock, reverse the screw ring 14 to separate it from the positioning rod 110. Pull the connecting ring 18 to move the tooth 19 away from the gear plate body 11 until the positioning rod 110 separates from the positioning hole 12. This separates the damaged tooth 19 and the positioning rod 110 from the gear plate body 11. The new tooth 19 and the connecting ring 18 can then be connected to the positioning hole 12 through the positioning rod 110. Finally, screw the screw ring 14 into the positioning rod 110 to complete the replacement of the connecting ring 18 and the tooth 19.

[0024] Specifically, in one embodiment, regarding the aforementioned axial connection portion, such as Figures 1-4 As shown, the axial connection part includes a plug rod 15, one end of which is open to form a cross groove 16. A detachable cross rod 111 is provided inside the cross groove 16. A connector 113 is fixedly connected to the end of the cross rod 111 away from the plug rod 15. A detachable first limiting rod 17 is screwed onto one end of the plug rod 15. The telescopic end of the first limiting rod 17 extends into the cross groove 16 to clamp the cross rod 111.

[0025] In this embodiment, when the device needs to be installed, the insert rod 15 is inserted into the frame for connection. After the insert rod 15 is connected to the frame, when it is necessary to adjust the distance between the two crank pieces 2, the cross rod 111 is pulled to move in the cross groove 16. After the cross rod 111 stops moving, the first limiting rod 17 is screwed into the insert rod 15. The cross rod 111 is clamped by the insert rod 15, thereby fixing the cross rod 111 to one side of the insert rod 15. This allows the device to be adjusted according to the width of the frame, expanding the applicable range of the device. After the device is adjusted, the crank piece 2 is connected to the connector 113 and the insert rod 15. The crank piece 2 drives the insert rod 15 and the chainring body 11 to rotate.

[0026] In order to reduce the weight of the crankset body 11, such as Figures 1-4 As shown, the axial surface of the crank body 11 has multiple through lightweight holes 13, and the insert 15 is located between the multiple lightweight holes 13.

[0027] Specifically, in one embodiment, regarding the aforementioned crank component 2, as... Figure 1 , Figure 2 and Figure 5As shown, the crank component 2 includes a collar 22, the crank body 21 is fixedly connected to the circumferential surface of the collar 22, and a detachable second limiting rod 23 is also screwed onto the circumferential surface of the collar 22. The free end of the second limiting rod 23 extends into the collar 22 to clamp the connector 113 or the insert rod 15.

[0028] In this embodiment, when the crank body 21 needs to be installed, the two collars 22 are respectively fitted onto the connector 113 and the insert rod 15. After the collars 22 are connected to the connector 113 and the insert rod 15, the second limiting rod 23 is screwed onto the collars 22 until one end of the second limiting rod 23 moves into the inside of the collars 22 and clamps the connector 113 or the insert rod 15, thereby completing the fixing of the collars 22 and thus completing the installation of the crank body 21.

[0029] To improve the tightness of the collar 22 installation, such as Figures 3-4 As shown, the circumferential surfaces of the insertion rod 15 and the connector 113 are recessed to form side holes 114, which match the second limiting rod 23.

[0030] In this embodiment, when the second limiting rod 23 clamps the connector 113 or the insert rod 15, the engagement of the upper hole 114 of the connector 113 or the insert rod 15 makes the collar 22 more secure after installation, further improving the tightness of the crank body 21 after installation.

[0031] When the first limiting rod 17 clamps the cross rod 111, in order to make the cross rod 111 more secure, as Figure 3 As shown, the cross bar 111 is recessed inward along its own length to form a side groove 112.

[0032] 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 pallet crank assembly characterized by: The system includes a chainring assembly (1), which includes an axial connecting portion for connecting to the frame. A chainring body (11) is fixedly connected to the circumferential surface of the axial connecting portion, and a crank assembly (2) is also connected to the circumferential surface of the axial connecting portion. The chainring body (11) is located between two crank assemblies (2). The chainring body (11) has multiple positioning holes (12) arranged in a circular array along its axial direction. Each positioning hole (12) has a detachable positioning rod (110) installed inside it. A connecting ring (18) is fixedly connected between the positioning rods (110). Multiple mounting holes (115) are formed on the side of the crank body (11) away from the connecting ring (18). Multiple protruding teeth (19) for connecting the chain are fixedly connected in a ring array on the outer circumferential surface of the connecting ring (18). The mounting holes (115) are connected to the positioning holes (12). A detachable screw ring (14) is screwed onto the positioning rod (110). The screw ring (14) is located inside the mounting hole (115).

2. The crankset assembly according to claim 1, characterized in that: The axial connection portion includes a plug rod (15), one end of which is open to form a cross groove (16). A detachable cross rod (111) is provided inside the cross groove (16). A connector (113) is fixedly connected to the end of the cross rod (111) away from the plug rod (15). A detachable first limiting rod (17) is screwed onto one end of the plug rod (15). The telescopic end of the first limiting rod (17) extends into the cross groove (16) to clamp the cross rod (111).

3. The pallet crank assembly of claim 2, wherein: The axial surface of the toothbrush body (11) is provided with multiple through lightweight holes (13), and the insert (15) is located between the multiple lightweight holes (13).

4. A pallet crank assembly according to claim 2 or 3, characterised in that: The crank component (2) includes a collar (22), the circumferential surface of which is fixedly connected to the crank body (21), and the circumferential surface of the collar (22) is also screwed to a detachable second limiting rod (23), the free end of which extends into the collar (22) to clamp the connector (113) or the insert rod (15).

5. The pallet crank assembly of claim 4, wherein: The circumferential surfaces of the insertion rod (15) and the connector (113) are recessed to form side holes (114), which are matched with the second limiting rod (23).

6. The pallet crank assembly of claim 2, wherein: The cross bar (111) is recessed inward along its length to form a side groove (112).

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