Device for rapidly detecting taper size of double-end spline of middle-arranged bicycle

Abstract

The utility model relates to a middle-arranged bicycle double-end spline taper dimension rapid detection device, which is characterized in that a spline on one side of a bicycle double-end spline is directly sleeved through a through hole, the end face is flatly attached through a positioning surface, a phi 6 steel ball is rotated in a first through hole and a second through hole, and the first through hole and the second through hole are used as detection points. According to the utility model, the detection data is accurate and real, the measurement time is short, the detection is convenient, the detection can be carried out at any time on site, the qualified product can completely meet the assembly requirement, the time is saved, and the detection is rapid and convenient.

Description

Technical Field

[0001] This utility model relates to a rapid detection device for the taper dimension of the double-ended spline of a mid-mounted bicycle, which is suitable for the rapid inspection of the taper dimension of the double-ended spline of the bottom bracket of a mid-mounted bicycle. Background Technology

[0002] The standard for the bottom bracket connecting the pedals of EBIKE electric-assist bicycles is the double-spline bottom bracket of mid-drive bicycles. This bottom bracket has tapered splines at both ends, and the bottom diameter of the splines on both cross sections must be controlled within tolerance limits; otherwise, the crank assembly will be unreliable, making riding impossible. Currently, CNC machining is used. Therefore, the tapered dimensions of the double splines on this mid-drive bicycle are CNC machined. Current testing methods require inspection on a coordinate measuring machine (CMM), which limits the frequency and location of inspections. Furthermore, the repeatability of CMM measurements is unstable due to measurement errors. Using imported tapered spline gauges for inspection is also problematic because the internal splines are tapered, making measurement confirmation difficult and unable to determine gauge quality. Additionally, because the spline gauges are tapered, they wear out quickly after prolonged measurement. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned shortcomings in the existing technology and provide a fast detection device for the taper dimension of a centrally mounted bicycle double-headed spline that is reasonably designed, simple in structure, accurate in detection data, short in measurement time, and can be tested on-site at any time. This tooling is low in cost, convenient in detection, easy to manage, and has high positioning accuracy.

[0004] The technical solution adopted by this utility model to solve the above problems is: a rapid detection device for the taper dimension of a centrally mounted bicycle double-headed spline, comprising a detection device body with a square structure, wherein the detection device body is provided with a through hole extending from the front to the back; the top and bottom surfaces of the detection device body are provided with first through holes, and the left and right sides of the detection device body are provided with second through holes, and the front end of the detection device body is a positioning surface; the first through hole communicates with the through hole, and the second through hole communicates with the through hole.

[0005] The device body of this invention is formed by one-time slow wire EDM machining, which reduces manufacturing errors and improves detection accuracy.

[0006] In this invention, the distance between the center of the first through hole and the positioning surface is less than the distance between the second through hole and the positioning surface. Two detection points are used to confirm the dimensions of the two cross sections.

[0007] The first through hole of this utility model is fitted with a Φ6 steel ball, the second through hole is fitted with a Φ6 steel ball, and the through hole is fitted with the splines at both ends of a bicycle double-ended spline.

[0008] This utility model is a simulation structure that adopts the envelope principle. Using the first and second through holes as detection points, the distance between the two steel balls is measured with an outside micrometer, and the theoretical value of the diameter of the two steel balls is the actual value of the bottom diameter of the double-headed spline of the bicycle. This utility model provides accurate and reliable detection data with short measurement time. It is convenient to detect and can be performed on-site at any time. Qualified products can fully meet assembly requirements, saving time and providing convenience.

[0009] Compared with the prior art, this utility model has the following advantages and effects: 1. The shape of the centrally mounted bicycle double-headed tapered spline is enveloped, and the positioning reference is consistent with the product inspection position. The positioning surface to the inspection point is also at the first and second through holes, resulting in high positioning accuracy and high inspection accuracy; 2. It adopts one-time processing to reduce manufacturing errors, making manufacturing simple and low-cost; 3. It is very convenient to use, has low requirements for the operating environment, has extremely small repeatability error, and does not require a coordinate measuring machine in the testing room, so it can be used on-site; 4. Inspection is convenient, requiring only simple on-site operation training for employees to master, and the inspection time is not short, saving a lot of time compared with coordinate measuring machine inspection. Attached Figure Description

[0010] Figure 1 This is a cross-sectional structural diagram of an embodiment of the present utility model.

[0011] Figure 2 This is a schematic diagram of the double-headed tapered spline shaft structure of a bicycle according to an embodiment of this utility model.

[0012] Figure 3 For utility model Figure 2 Schematic diagram of the inspection at the BB section (first through hole).

[0013] Figure 4 This utility model Figure 2 Schematic diagram of the inspection at the CC section (second through hole).

[0014] In the figure: 1. Detection device body, 2. Through hole, 3. First through hole, 4. Second through hole, 5. Positioning surface, 6. Bicycle double-headed spline, 7. Φ6 steel ball. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0016] See Figure 1-4The rapid detection device for the taper dimension of the double-headed spline of a bicycle in this embodiment includes a square-shaped detection device body 1. The detection device body 1 has a through hole 2 that extends from the front to the back. The top and bottom surfaces of the detection device body 1 have first through holes 3, and the left and right sides of the detection device body 1 have second through holes 4. The front end of the detection device body 1 is a positioning surface 5. The first through hole 3 communicates with the through hole 2, and the second through hole 4 communicates with the through hole 2.

[0017] In this embodiment, the device body 1 is formed by one-time slow wire EDM machining.

[0018] In this embodiment, the distance between the center of the first through hole 3 and the positioning surface 5 is less than the distance between the second through hole 4 and the positioning surface 5.

[0019] In this embodiment, the first through hole 3 is fitted with the Φ6 steel ball 7, the second through hole 4 is fitted with the Φ6 steel ball 7, and the through hole 3 is fitted with the splines at both ends of the bicycle double-headed spline 6.

[0020] This invention is a simulation structure that utilizes the envelope principle. Two first through holes 3 and second through holes 4 are machined using high-precision wire EDM. One side of a bicycle double-ended spline 6 is directly fitted through the through hole 2 and flattened by the positioning surface 5. Two Φ6 steel balls 7 are placed in the two holes on the top and bottom surfaces of the first through hole 3 by rotation, and two Φ6 steel balls 7 are placed in the two holes on the left and right sides of the second through hole 4 by rotation. Using the first through hole 3 and the second through hole 4 as detection points, the distance between the two Φ6 steel balls in the same through hole is measured with an outside micrometer. Subtracting the theoretical value of the two Φ6 steel ball diameters gives the actual bottom diameter of the bicycle double-ended spline. This invention provides accurate and reliable detection data with short measurement time, making detection convenient and allowing for on-site testing at any time. Qualified products fully meet assembly requirements, saving time and effort.

[0021] Furthermore, it should be noted that all equivalent or simple variations made based on the structure, features, and principles of this utility model patent are included within the scope of protection of this utility model patent.

Claims

1. A rapid detection device for the taper dimension of a centrally mounted bicycle with double-ended splines, characterized in that: The detection device body includes a square-shaped structure, and the detection device body has a through hole extending from the front to the back. The top and bottom surfaces of the detection device body are provided with first through holes, the left and right sides of the detection device body are provided with second through holes, and the front end of the detection device body is a positioning surface. The first through hole is connected to the through hole, and the second through hole is connected to the through hole.

2. The rapid detection device for the taper dimension of a centrally mounted bicycle double-headed spline according to claim 1, characterized in that: The main body of the device is formed by a single slow wire EDM process.

3. The rapid detection device for the taper dimension of a centrally mounted bicycle double-headed spline according to claim 1, characterized in that: The distance between the center of the first through hole and the positioning surface is less than the distance between the second through hole and the positioning surface.

4. The rapid detection device for the taper dimension of a centrally mounted bicycle double-headed spline according to claim 1, characterized in that: The first through hole is fitted with a Φ6 steel ball, the second through hole is fitted with a Φ6 steel ball, and the through hole is fitted with the splines at both ends of a bicycle double-ended spline.

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