Novel connecting structure of crank pedal

Abstract

The utility model provides a novel connecting structure of a crank pedal, relates to the technical field of pedals, and solves the problem that a pedal shaft and the crank are discarded due to the fact that the existing pedal and the crank are in threaded connection and are buckled disorderly in the mounting and using processes. One end of the pedal mandrel is rotatably inserted into a shaft hole, the other end of the pedal mandrel is connected with one end of a crank, a first single-taper sleeve and a first bearing are arranged in the end, away from the crank, of the shaft hole, the pedal mandrel is sleeved with the first single-taper sleeve, and the first bearing is rotatably arranged on the conical surface of the first single-taper sleeve in a sleeved mode. The end, away from the crank, of the pedal mandrel is in threaded connection with a first nut, a second bearing is arranged in the end, facing the crank, of the shaft hole, and the conical surface of the corresponding position of the pedal mandrel is rotationally sleeved with the second bearing. The utility model has the beneficial effects that the requirements on installation personnel and installation tools are low, the connection reliability is far higher than that of the existing structure, the processing and manufacturing precision is low, the processing and manufacturing are easy, and the disassembly and assembly during maintenance are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of pedals, in particular to a novel connecting structure of a crank pedal. Background Art

[0002] For decades, the connection between the pedal of a bicycle or a stationary spinning bike and the crank has been using British standard thread connection. Although the thread connection seems firm, in fact, it is not. Because a major defect of the thread connection is that the stress is concentrated on the first few threads, which bears more than 90% of the tightening force. However, for this connection, both ends need to be stressed. Therefore, using too many thread connections cannot meet this requirement. With too many thread connections, it is very easy to get the threads crossed when installing and turning the threads. After the threads are crossed, not only the pedal shaft is scrapped, but also the crank is scrapped. Since most of these installations are carried out by the purchasers and the installation is not professional, the threads cannot be screwed to the bottom, often making the connection between the pedal shaft and the crank in a non-fastened state. Once put into use, the threads will be damaged, resulting in the scrapping of the pedal shaft and the crank. Content of the Utility Model

[0003] The purpose of the utility model is to solve the problem that the existing connection between the pedal and the crank uses too many thread connections, and the threads are crossed during the installation and use process, resulting in the scrapping of the pedal shaft and the crank.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A novel connecting structure of a crank pedal, which includes a pedal body and a crank. An axial hole is provided in the middle of the pedal body. It is characterized in that: it further includes a pedal core shaft, one end of which is rotatably inserted into the axial hole and the other end is connected to one end of the crank. The pedal core shaft is a stepped shaft. The aperture at both ends of the axial hole is larger than the aperture in the middle of the axial hole. A first single-cone sleeve and a first bearing are arranged in the axial hole at the end far from the crank. The first single-cone sleeve is sleeved on the pedal core shaft. The first bearing is rotatably sleeved on the conical surface of the first single-cone sleeve. A first nut is threadedly connected to the end of the pedal core shaft far from the crank. The first nut is in close contact with the first single-cone sleeve. A second bearing is arranged in the axial hole at the end facing the crank. The second bearing is rotatably sleeved on the conical surface of the corresponding position of the pedal core shaft.

[0006] Further improvement is that: a connection hole is provided at one end of the crank connected to the pedal core shaft. A double-cone sleeve is arranged in the connection hole. A second single-cone sleeve is sleeved on the end of the pedal core shaft far from the pedal. The two conical surfaces in the double-cone sleeve are respectively sleeved on the conical surface of the second single-cone sleeve and the conical surface of the corresponding position of the pedal core shaft. A second nut is arranged on the side of the second single-cone sleeve far from the conical surface. The second nut is threadedly connected to the end of the pedal core shaft far from the pedal.

[0007] Further improvement is that: the second nut is a hexagonal nut.

[0008] Further improvement is that a washer is arranged between the first nut and the first single-cone sleeve, and the washer is sleeved on the pedal spindle.

[0009] Further improvement is that a plug is snap-connected to the end of the pedal body away from the crank.

[0010] Further improvement is that a clamping block is arranged on the outer peripheral wall of one end of the pedal body into which the plug is inserted, and a clamping groove adapted to the clamping block is arranged on the inner wall of the shaft hole at the end of the pedal body away from the crank.

[0011] Further improvement is that the plug is snap-connected to the left end of the pedal body through the cooperation of the clamping block and the clamping groove.

[0012] Further improvement is that the first nut is a hexagonal nut.

[0013] After adopting the above technical solution, compared with the existing technology, the following beneficial effects are achieved:

[0014] The threaded connection is reduced, and the cone connection is adopted to solve the problem. The requirements for installers and installation tools are low. The reliability of the connection is much greater than that of the existing structure. The machining and manufacturing accuracy is low, it is easy to machine and manufacture, and it is convenient to disassemble and assemble during maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 is a structural schematic diagram of the present invention;

[0017] Figure 2 is the Figure 1 front structural schematic diagram of the present invention;

[0018] Figure 3 is the Figure 2 A-A cross-sectional structural schematic diagram in the present invention;

[0019] Figure 4 is the Figure 2 B-B cross-sectional structural schematic diagram in the present invention;

[0020] Figure 5 is the Figure 4 enlarged structural schematic diagram of part C in the present invention;

[0021] Figure 6is of the present utility model Figure 4 is a schematic enlarged view of part D in

[0022] Figure 7 is a schematic view of the pedal core shaft structure in the present utility model.

[0023] Explanation of reference numerals: pedal main body 1, crank 2, pedal core shaft 3, plug 4, first nut 5, first single-cone sleeve 6, first bearing 7, second bearing 8, second single-cone sleeve 9, double-cone sleeve 10, second nut 11, shaft hole 12, washer 13, connection hole 14. Specific embodiments

[0024] Referring to Figures 1-7 As shown, the technical solution adopted in this specific embodiment is: a new connection structure for a crank pedal, which includes a pedal main body 1 and a crank 2. An axial shaft hole 12 is provided in the middle of the pedal main body 1. It also includes a pedal core shaft 3 with one end rotatably inserted into the shaft hole 12 and the other end connected to one end of the crank 2. The pedal core shaft 3 is a stepped shaft. The aperture at both ends of the shaft hole 12 is larger than the aperture in the middle of the shaft hole 12. A first single-cone sleeve 6 and a first bearing 7 are arranged in the shaft hole 12 at the end far from the crank 2. The first single-cone sleeve 6 is sleeved on the pedal core shaft 3. The first bearing 7 is rotatably sleeved on the conical surface of the first single-cone sleeve 6. A first nut 5 is threadedly connected to the end of the pedal core shaft 3 far from the crank 2. The first nut 5 is in close contact with the first single-cone sleeve 6. A second bearing 8 is arranged in the shaft hole 12 at the end facing the crank 2. The second bearing 8 is rotatably sleeved on the conical surface of the corresponding position of the pedal core shaft 3.

[0025] Among them, a connection hole 14 is provided at the end of the crank 2 connected to the pedal core shaft 3. A double-cone sleeve 10 is arranged in the connection hole 14. A second single-cone sleeve 9 is sleeved on the end of the pedal core shaft 3 far from the pedal. The two conical surfaces in the double-cone sleeve 10 are respectively sleeved on the conical surface of the second single-cone sleeve 9 and the conical surface of the corresponding position of the pedal core shaft 3. A second nut 11 is arranged on the side of the second single-cone sleeve 9 far from the conical surface. The second nut 11 is threadedly connected to the end of the pedal core shaft 3 far from the pedal.

[0026] Among them, the second nut 11 is a hexagonal nut.

[0027] Among them, a washer 13 is arranged between the first nut 5 and the first single-cone sleeve 6. The washer 13 is sleeved on the pedal core shaft 3.

[0028] Among them, a plug 4 is snap-connected to the end of the pedal main body 1 far from the crank 2.

[0029] Among them, the plug 4 is snapped into the pedal main body 1. A clamping block is provided on the outer peripheral wall of one end of the pedal main body 1. A clamping groove adapted to the clamping block is provided on the inner wall of the shaft hole 12 at the end of the pedal main body 1 far from the crank 2.

[0030] Among them, the plug 4 is clamped on the left end of the pedal body 1 through the cooperation of the clamping block and the clamping groove.

[0031] Among them, the first nut 5 is a hexagon nut.

[0032] The main process route of the present utility model is as follows:

[0033] 1. Material selection (medium carbon steel can be used for all materials, without special requirements);

[0034] 2. Turning the shaft, sleeve, and cone;

[0035] 3. Heat treatment (still using the original treatment process to improve the comprehensive mechanical properties of the shaft core and the surface hardness of the bearing raceway);

[0036] 4. Precision turning to improve accuracy and surface roughness;

[0037] 5. Boring the inner hole;

[0038] 6. Installation;

[0039] 7. Inspection.

[0040] The working principle of the present utility model: reducing the threaded connection structure fundamentally solves the problem of thread jamming; according to the characteristic that the tiny axial force of the cone can be converted into a huge radial force, the cone structure is adopted to make the connection combination more reliable and firm; the double short cone surfaces are used to maximize the separation of the two forces generating the couple, so that the force is minimized within the possible existence range; according to the characteristics of the stepped shaft, the shaft diameter corresponding to the cone on the side close to the pedal body is naturally designed to be larger than the shaft diameter at the other couple, which exactly conforms to the force characteristics at these two shaft diameters, that is, one is large and the other is small; the provider of the axial force can use coarse-threaded screws, because after tightening, the axial force generated by the double cones pushing the nut under the action of friction is not only extremely small but also constant.

[0041] The above shows and describes the basic principles, main features, and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and explanations only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Where the present utility model is not described in detail, it is all well-known technology to those skilled in the art.

Claims

1. A new crank pedal connection structure, comprising a pedal body and a crank, wherein an axial hole is axially arranged in the middle of the pedal body, and characterized in that: The pedal shaft further comprises a pedal axle having one end rotatably inserted in an axial hole and the other end connected to one end of a crank, the pedal shaft being a stepped shaft, the apertures at both ends of the axial hole being larger than the aperture in the middle of the axial hole, a first single tapered sleeve and a first bearing being arranged in the end of the axial hole away from the crank, the first single tapered sleeve being sleeved on the pedal shaft, the first bearing being rotatably sleeved on the conical surface of the first single tapered sleeve, a first nut being threadedly connected on the end of the pedal shaft away from the crank, the first nut being tightly attached to the first single tapered sleeve, a second bearing being arranged in the end of the axial hole facing the crank, the second bearing being rotatably sleeved on the conical surface at the corresponding position of the pedal shaft.

2. The novel crank pedal connection structure according to claim 1 is characterized in that: A connecting hole is provided on the end of the crank connected to the pedal core shaft, and a double tapered sleeve is provided in the connecting hole. A second single tapered sleeve is provided on the end of the pedal core shaft away from the pedal, and two tapered surfaces in the double tapered sleeve are respectively sleeved on the tapered surface of the second single tapered sleeve and the tapered surface at the corresponding position of the pedal core shaft. A second nut is provided on the side of the second single tapered sleeve away from the tapered surface, and the second nut is threadedly connected to the end of the pedal core shaft away from the pedal.

3. The novel crank pedal connection structure according to claim 2 is characterized in that: The second nut is a hexagonal nut.

4. The novel crank pedal connection structure according to claim 1 is characterized in that: A washer is arranged between the first nut and the first single cone sleeve, and the washer is sleeved on the pedal core shaft.

5. The novel crank pedal connection structure according to claim 1 is characterized in that: A plug is clamped on one end of the pedal body away from the crank.

6. The novel crank pedal connection structure according to claim 5, characterized in that: A clamping block is arranged on the outer peripheral wall of one end of the pedal body where the plug is clamped, and a clamping groove matched with the clamping block is arranged on the inner wall of the shaft hole on the end of the pedal body away from the crank.

7. The novel crank pedal connection structure according to claim 6 is characterized in that: The plug is clamped on the left end of the pedal body through the cooperation of the clamping block and the clamping groove.

8. The novel crank pedal connection structure according to claim 1 is characterized in that: The first nut is a hexagonal nut.

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