Foldable bicycle crank structure

Abstract

The utility model is applicable to the field of cranks, and provides a foldable bicycle crank structure which comprises a crank middle section, crank lower sections are rotatably mounted at two ends of the crank middle section, pedal mounting holes are formed in the crank lower sections, and bicycle pedals are mounted in the pedal mounting holes. A first positioning structure is arranged between the crank middle section and the crank lower section and comprises a first mounting groove formed in the side face of the end of the crank middle section. When the bicycle pedal is folded, the movable boss pin is pressed downwards to be separated from the positioning groove, then the crank lower section can be rotated to be parallel to the bicycle body, then the second positioning structure positions the crank lower section again, the crank lower section and the bicycle pedal are prevented from rotating at will, and therefore the bicycle pedal can be tightly attached to the bicycle body to be packaged. No extra space needs to be reserved, the bicycle pedals are prevented from being damaged, the size of a packaging box is reduced, and the transportation cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of cranks, and in particular relates to a foldable bicycle crank structure. Background Art

[0002] Bicycles, also known as bicycles or bikes, are usually two-wheeled small land vehicles. There are many types of bicycles, including single-person bicycles, double-person bicycles, and multi-person bicycles. Bicycles can be used as environmentally friendly means of transportation for travel and travel. Bicycles themselves are also a sports competition, including road cycling races, mountain bike races, track cycling races, and stunt bike races.

[0003] Bicycles have various structures and designs, but the basic components include frames, tires, pedals, chains, brakes, etc. Bicycle cranks are part of bicycle accessories. They connect the pedals and the chainrings. They are used to transfer the kinetic energy from the pedals to the driving wheel of the bicycle through the chain on the chainrings. Bicycle cranks are the input structure of bicycle power.

[0004] After the pedals on the cranks of current bicycles are assembled, they are generally fixedly connected to the cranks, and the pedals as a whole cannot be folded. Since the pedal body structure protrudes, it is easy to collide with external objects during transportation, thereby causing damage. In addition, the pedal surface is usually perpendicular to the plane where the main body of the bicycle is located. The space where the pedals protrude will also cause a waste of space in the packaging box, resulting in an increase in the volume of the packaging box and an increase in transportation costs.

[0005] In order to avoid the above technical problems, it is necessary to provide a foldable bicycle crank structure to overcome the above defects in the prior art. Utility Model Content

[0006] The utility model aims to provide a foldable bicycle crank structure, aiming to solve the problem caused by the inability to fold pedals.

[0007] The utility model is implemented as follows: a foldable bicycle crank structure comprises a crank middle section, which is fixedly mounted on a bicycle gear disc, the crank middle section being a "Z"-shaped structure, and the crank lower section is rotatably mounted on both ends of the crank middle section, and a pedal mounting hole is provided on the crank lower section, and the pedal mounting hole is used to mount a bicycle pedal, and a first positioning structure is provided between the crank middle section and the crank lower section, and the first positioning structure comprises a No. 1 mounting groove provided on the side surface of the end portion of the crank middle section, a movable boss pin is slidably connected inside the No. 1 mounting groove, an elastic component is provided between the movable boss pin and the No. 1 mounting groove, a positioning hole matching the movable boss pin is provided on the side surface at the corresponding position of the crank lower section, one end of the movable boss pin is inserted into the positioning hole, and the movable boss pin is pressed down to disengage the movable boss pin from the positioning hole, so that the crank lower section can be rotated, and when the axis of the pedal mounting hole of the crank lower section is parallel to the vehicle body, the folding is completed.

[0008] According to a further technical solution, the movable boss pin is composed of a large-diameter column and a small-diameter column, the diameter of the No. 1 mounting groove is the same as the diameter of the large-diameter column, the diameter of the positioning hole is the same as the diameter of the small-diameter column, and the small-diameter column is inserted into the positioning hole, thereby preventing the movable boss pin from falling out of the positioning hole.

[0009] A further technical solution also includes a limiting structure, which is installed between the middle section of the crank and the lower section of the crank, and is used to limit the rotation angle of the lower section of the crank.

[0010] A further technical solution is that the limiting structure includes a No. 2 mounting groove opened at the end of the middle section of the crank, a limiting pin is installed inside the No. 2 mounting groove, and a limiting groove is opened on the side of the lower section of the crank, and one end of the limiting pin protruding from the middle section of the crank extends into the limiting groove. When the lower section of the crank rotates, the limiting pin can rotate according to the angle of the limiting groove.

[0011] According to a further technical solution, the limiting groove is an arc groove, and the center angle of the arc groove is 90°, so that the lower section of the crank can be rotated 90° to complete the folding.

[0012] A further technical solution also includes a second positioning structure, which is installed on the middle section and the lower section of the crank. The composition structure of the second positioning structure is the same as the first positioning structure. When the lower section of the crank is folded, the second positioning structure and the lower section of the crank are clamped.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] The utility model provides a foldable bicycle crank structure. When folding, the movable boss pin is pressed down to disengage the positioning groove, and then the lower section of the crank can be rotated to be parallel to the bicycle body. Then the second positioning structure positions the lower section of the crank again to prevent the lower section of the crank and the bicycle pedal from rotating at will, so that the bicycle can be packed close to the bicycle body without leaving extra space, thereby avoiding damage to the bicycle pedal, reducing the volume of the packaging box, and reducing transportation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 It is a schematic diagram of the three-dimensional exploded structure of the utility model;

[0017] Figure 3 For the utility model Figure 2 The enlarged structural diagram at A in the middle;

[0018] Figure 4 It is a schematic diagram of the three-dimensional structure of the lower section of the crank of the utility model.

[0019] In the attached drawings: 1. middle section of crank; 2. lower section of crank; 3. pedal mounting hole; 4. mounting slot No. 1; 5. movable boss pin; 6. elastic member; 7. positioning hole; 8. mounting slot No. 2; 9. limit pin; 10. limit slot. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0022] like Figure 1-4As shown, a foldable bicycle crank structure provided by the utility model comprises a crank middle section 1, the crank middle section 1 is fixedly mounted on a bicycle gear disc, the crank middle section 1 is a "Z"-shaped structure, both ends of the crank middle section 1 are rotatably mounted with a crank lower section 2, the crank lower section 2 is provided with a pedal mounting hole 3, the pedal mounting hole 3 is used to mount a bicycle pedal, a first positioning structure is provided between the crank middle section 1 and the crank lower section 2, the first positioning structure comprises a first mounting groove 4 provided on the side surface of the end of the crank middle section 1, the The interior of the No. 1 mounting groove 4 is slidably connected with a movable boss pin 5, and an elastic component 6 is arranged between the movable boss pin 5 and the No. 1 mounting groove 4. A positioning hole 7 matching with the movable boss pin 5 is opened on the side surface of the corresponding position of the crank lower section 2. One end of the movable boss pin 5 is inserted into the positioning hole 7. This is the unfolded state of the bicycle pedal. The movable boss pin 5 is pressed down to disengage the movable boss pin 5 from the positioning hole 7, and the crank lower section 2 can be rotated. When the axis of the pedal mounting hole 3 of the crank lower section 2 is parallel to the vehicle body, the folding is completed.

[0023] In the embodiment of the present utility model, Figure 3 As shown, as a preferred embodiment of the utility model, the movable boss pin 5 is composed of a large diameter column and a small diameter column, the diameter of the No. 1 mounting groove 4 is the same as the diameter of the large diameter column, the diameter of the positioning hole 7 is the same as the diameter of the small diameter column, and the small diameter column is inserted into the positioning hole 7, thereby preventing the movable boss pin 5 from falling out of the positioning hole 7.

[0024] In the embodiment of the present utility model, Figure 1-4 As shown, as a preferred embodiment of the utility model, it also includes a limiting structure, which is installed between the crank middle section 1 and the crank lower section 2, and the limiting structure is used to limit the rotation angle of the crank lower section 2.

[0025] In the embodiment of the present utility model, Figure 1-4 As shown, as a preferred embodiment of the utility model, the limiting structure includes a No. 2 mounting groove 8 opened at the end of the crank middle section 1, a limiting pin 9 is installed inside the No. 2 mounting groove 8, and a limiting groove 10 is opened on the side of the crank lower section 2. One end of the limiting pin 9 protrudes from the crank middle section 1 and extends into the limiting groove 10. When the crank lower section 2 rotates, the limiting pin 9 can rotate according to the angle of the limiting groove 10.

[0026] In the embodiment of the present utility model, Figure 4 As shown, as a preferred embodiment of the utility model, the limiting groove 10 is an arc groove, and the center angle of the arc groove is 90°, so that the lower crank section 2 can be rotated 90° to complete the folding.

[0027] In an embodiment of the utility model, as a preferred embodiment of the utility model, it also includes a second positioning structure (not shown), which is installed on the crank middle section 1 and the crank lower section 2. The composition structure of the second positioning structure is the same as the first positioning structure. When the second positioning structure and the crank lower section 2 are engaged, the crank lower section 2 is in a folded state, thereby preventing the crank lower section 2 from rotating again.

[0028] When folding the foldable bicycle crank structure, the movable boss pin 5 is pressed down to disengage the positioning groove, and then the crank lower section 2 can be rotated to be parallel to the bicycle body, and then the second positioning structure positions the crank lower section 2 again to prevent the crank lower section 2 and the bicycle pedal from rotating at will, so that the bicycle can be packed close to the bicycle body without leaving extra space, thus avoiding damage to the bicycle pedal, reducing the volume of the packaging box, and reducing the transportation cost; when unfolding, the movable boss pin 5 of the second positioning structure is pressed down, and the bicycle pedal is rotated to a state perpendicular to the bicycle body, and the movable boss pin 5 of the first positioning structure will position and fix the crank lower section 2, so that the user can ride it.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0030] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A foldable bicycle crank structure, comprising a crank midsection, characterized in that: The crank lower sections are rotatably mounted on both ends of the crank middle section, and a pedal mounting hole is provided on the crank lower section, and the pedal mounting hole is used to install a bicycle pedal. A first positioning structure is provided between the crank middle section and the crank lower section, and the first positioning structure includes a No. 1 mounting groove provided on the side surface of the end portion of the crank middle section, a movable boss pin is slidably connected inside the No. 1 mounting groove, an elastic component is provided between the movable boss pin and the No. 1 mounting groove, a positioning hole matching the movable boss pin is provided on the side surface at the corresponding position of the crank lower section, one end of the movable boss pin is inserted into the positioning hole, and the crank lower section is rotated. When the axis of the pedal mounting hole of the crank lower section is parallel to the vehicle body, the folding is completed.

2. The foldable bicycle crank structure according to claim 1, characterized in that: The movable boss pin is composed of a large-diameter column and a small-diameter column. The diameter of the No. 1 mounting groove is the same as the diameter of the large-diameter column, the diameter of the positioning hole is the same as the diameter of the small-diameter column, and the small-diameter column is inserted into the positioning hole.

3. The foldable bicycle crank structure according to claim 1, characterized in that: It also includes a limiting structure, which is installed between the middle section of the crank and the lower section of the crank, and is used to limit the rotation angle of the lower section of the crank.

4. The foldable bicycle crank structure according to claim 3, characterized in that: The limiting structure includes a No. 2 mounting groove opened at the end of the middle section of the crank, a limiting pin is installed inside the No. 2 mounting groove, a limiting groove is opened on the side of the lower section of the crank, one end of the limiting pin protruding from the middle section of the crank extends into the limiting groove, and when the lower section of the crank rotates, the limiting pin can rotate according to the angle of the limiting groove.

5. The foldable bicycle crank structure according to claim 4, characterized in that: The limiting groove is an arc-shaped groove, and the center angle of the arc-shaped groove is 90°.

6. The foldable bicycle crank structure according to claim 1, characterized in that: It also includes a second positioning structure, which is installed on the middle section of the crank and the lower section of the crank. The structure of the second positioning structure is the same as the first positioning structure. When the lower section of the crank is folded, the second positioning structure and the lower section of the crank are clamped.

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