Balance weight nipples

Abstract

The present invention relates to balance weight nipples, and provides nipples attaching to one end of the spokes supporting a rim, the nipples adjusting the weight balance of the rim.

Description

Balance Weight Nipple

[0001] It's about nipples that can balance the weight of the rim.

[0002] Balance is a crucial factor in evaluating high-performance bicycle wheels. Rotor balance can be divided into dynamic balance, which involves multiple straightening planes, and static balance, which involves a single straightening plane. For bicycle wheels with a relatively small L / D (L: length of the rotating body excluding the axis of rotation, D: diameter of the rotating body) ratio, static balance can be applied.

[0003] ISO21940-11, Mechanical vibration - Rotor balancing - Part 11: Procedures and tolerances for rotors with rigid behavior, establishes a balance quality grade G that allows classification of balance quality requirements for typical types based on worldwide experience and similarity considerations, with an acceptable level of imbalance. is as follows.

[0004]

[0005] Here, ,

[0006] As of now, the ISO standard does not specify the G grade for lightweight bicycle wheels weighing around 1.0 kg, so the G value of 40 mm / s of the G40 grade applied to automobile wheels weighing around 10 kg, which are in a relatively similar category, is approximately applied, and the diameter of the rim of a general road bicycle wheel is 622 mm (based on the 700C standard), the mass of a single wheel including the tire is 1.0 kg, the outer diameter of the tire in contact with the ground is 680 mm, the driving speed is 40 km / h, and the location of the allowable unbalanced mass is 311 mm from the end of the wheel rim (= 622 mm / 2), the calculation result is as follows.

[0007]

[0008]

[0009] In other words, if the G40 balance quality grade, which is applied to heavy automobile wheels, is arbitrarily applied, the allowable unbalanced mass for a bicycle wheel traveling at 40 km / h can be calculated as 3.9 g. However, since bicycle wheels have a much lower mass than car wheels, the balance quality grade applied to actual bicycle wheels should be lower than G40.

[0010] That is, the allowable unequal mass of a bicycle wheel is also lower than 3.9g, and as the weight of the wheel becomes lighter and the riding speed becomes faster, this value becomes even lower.

[0011] Meanwhile, the ISO equilibrium quality grade applied to high-RPM rotating machinery such as turbines, gears, and fans is G6.3, and when the size of G6.3, 6.3 mm / s, is applied to the above equation, the allowable unbalanced mass is only 0.6 g.

[0012] Therefore, the allowable unbalanced mass for a bicycle wheel can be roughly estimated using the ISO standard to be between 3.9g and 0.6g, which is the middle range between G40 and G6.3.

[0013] It is a well-known fact that bicycle wheels made of lightweight carbon material react sensitively to a mass change of 1-2g caused by simply changing the length or material of the air injection valve, causing up-and-down vibrations when the wheel rotates.

[0014] Therefore, minimizing the unbalanced mass of a high-performance bicycle wheel to less than 1-2g is an essential element that not only improves driving stability by suppressing unnecessary vibrations, but also minimizes power loss caused by vibrations, thereby maximizing the wheel's limit driving performance.

[0015] However, in the case of lightweight carbon bicycle wheels that have recently been mass-produced and manufactured using carbon fiber pre-preg, it is very difficult to precisely control the amount of resin impregnated into the pre-preg during the production process.

[0016] Specifically, it is technically difficult to maintain the resin uniformly under high temperature and high pressure until carbon molding is completed, so the mass distribution inside the carbon rim is usually uneven.

[0017] As the carbon rim height increases, the amount of carbon pre-preg material also increases, leading to a further increase in the magnitude and deviation of the unbalanced mass. Products with an unbalanced mass exceeding 20g (or a ratio of unbalanced mass to the carbon rim mass of 5%) are frequently produced.

[0018] However, most manufacturers producing carbon rims for bicycles to date only consider whether the overall mass of the carbon rim falls within the production tolerance range as a standard for quality control, and have not properly established postprocessing quality control standards for how uniformly the carbon rim is manufactured internally and to what extent unbalanced mass should be suppressed.

[0019] In lightweight, high-performance bicycle wheels made of carbon fiber, unbalanced masses exceeding a certain size realistically cause many problems, including vibration, reduced driving stability, power loss, and reduced top speed.

[0020] On the actual user side, as a temporary measure, they are finding the location and size of the unbalanced mass through trial and error, and attaching lead tape for mass compensation to the outside of the rim surface opposite the location.

[0021] Accordingly, the present invention proposes an effective post-processing compensation method for unbalanced mass of a high-performance bicycle wheel.

[0022] At this time, arbitrary methods such as installing additional attachments on the outside of an already aerodynamically optimally designed carbon rim should not be used, as this will impair the aerodynamic performance of the wheel.

[0023] Therefore, it is desirable that the balance weight that compensates for the mass be installed inside the rim.

[0024] Additionally, the balance weight settings should be freely adjustable by the user.

[0025] To ensure economy and compatibility, the existing wheel assembly structure must be utilized as is.

[0026] Easy maintainability must be ensured, allowing for repeated disassembly and assembly.

[0027]

[0028] *27 Accordingly, the inventor of the present invention proposes a balance weight nipple structure having the following concept.

[0029] A balance weight nipple is proposed, comprising a nipple that is connected to one end of a spoke that supports a rim, wherein the nipple adjusts the weight balance of the rim.

[0030] More specifically, the balance weight nipple may include a balance weight nipple lower portion including a cylindrical protrusion, a cross-sectional portion for tool fastening, a tapered portion in contact with a rim, and an internal fastening portion to which a spoke is fastened and located on the protrusion; and a balance weight nipple upper portion integrally connected to the balance weight nipple lower portion and having a round cylindrical shape; and may be an integral structure.

[0031] Alternatively, the balance weight nipple may be an extended structure including a balance weight nipple base portion including a lower portion of a balance weight nipple base portion having a cylindrical protrusion, a cross-sectional portion for fastening a tool, a tapered portion in contact with a rim, and an internal fastening portion to which a spoke is fastened and located inside the protrusion; an upper portion of a balance weight base portion having a round cylindrical shape and integrally connected to the lower portion of the balance weight nipple base portion; and a balance weight nipple extension portion fastened to the upper portion of the balance weight nipple base portion and having a function of adjusting the weight balance of the rim.

[0032] Alternatively, the above spokes may be implemented in a structure in which the protrusions to which they are fastened are omitted.

[0033] Specifically, a balance weight nipple can be provided that has a round cylinder shape, an internal fastening portion provided inside the rim without a protrusion and to which a spoke is fastened; a tapered shape portion that contacts the rim; and a protrusion located at the top of the cylinder and for use with a tool.

[0034] Alternatively, a balance weight nipple may be provided, which is an extension structure including a balance weight nipple base portion having a round cylinder shape, an internal fastening portion provided inside the rim without a protrusion and having a spoke fastened therein; and a tapered shape portion that comes into contact with the rim; and a balance weight nipple extension portion fastened to the balance weight nipple base portion and having a function of adjusting the weight balance of the rim.

[0035] The balance weight structure of this nipple structure will be described in more detail below.

[0036] It can effectively improve the unbalanced mass of high-performance bicycle wheels.

[0037] Figures 1 and 2 are schematic diagrams of an integral balance weight nipple according to one embodiment of the present invention.

[0038] Figures 3 and 4 are schematic diagrams of an extended balance weight nipple according to one embodiment of the present invention.

[0039] Figure 5 is a schematic diagram of a built-in / integrated and built-in / extended balance weight nipple.

[0040] Figure 6 is a schematic diagram illustrating a method for calculating the unbalanced mass and compensation mass of a wheel.

[0041] Figures 7 to 9 show the calculation results of the unbalanced mass and correction mass according to the number of spokes.

[0042] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0043] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0044] Furthermore, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0045] Furthermore, when we say that a layer, membrane, region, plate, or other part is "above" or "on" another part, this includes not only cases where it is "directly above" the other part, but also cases where there are other parts in between. Conversely, when we say that a part is "directly above" another part, we mean that there are no other parts in between. Furthermore, saying that a part is "above" or "on" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "above" or "on" the opposite direction of gravity.

[0046] Additionally, throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0047] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0048] In one embodiment of the present invention, a balance weight nipple is provided, which includes a nipple coupled to one end of a spoke supporting a rim, wherein the nipple adjusts the weight balance of the rim.

[0049] As mentioned above, carbon wheels suffer from weight balance issues due to various manufacturing issues. This issue is addressed by improving the nipple structure of spoked wheels.

[0050]

[0051] *45 A typical spoke type bicycle wheel can have spokes, nipples, and rims connected in series.

[0052] In one embodiment of the present invention, the balance weight nipple can be broadly classified into an integral type and an extended type, each of which can be classified into an internal type in which the nipple is positioned within the rim, and an external type in which a portion of the nipple protrudes outside the rim. Combinations of each type are possible, so that a total of four types of balance weight nipple structures can be disclosed as examples.

[0053] For example, the balance weight nipple may be a balance weight nipple having an integral structure, including a balance weight nipple lower portion including a cylindrical protrusion, a cross-section for tool fastening (specifically, a square cross-section), a tapered shape that contacts a rim, and an internal fastening portion (specifically, a screw thread) located within the protrusion, to which a spoke is fastened; and a balance weight nipple upper portion integrally connected to the balance weight nipple lower portion and having a round cylindrical shape.

[0054] The balance weight nipple may be positioned at the upper end and may further include a protrusion for use with a tool. The tool used for maintenance may typically be a hex or square socket wrench.

[0055] The material of the above balance weight nipple may be a metal or alloy having a higher density than an aluminum alloy. The metal may be at least one of brass, tungsten, or an alloy thereof.

[0056] Specifically, for lightweight, high-performance bicycle wheels, nipples are mostly made of aluminum alloy (AL7075-T6, specific gravity 2.81 g / cm3). Therefore, balance weights, which compensate for the unbalanced mass of the wheel rim, must have a high density. Therefore, brass (8.6 g / cm3) or tungsten (19.3 g / cm3) alloys, which have high specific gravity and good machinability, can be used.

[0057] The upper part of the above balance weight nipple has the function of adjusting the weight balance of the rim, and its diameter may be larger than the diameter of the lower part of the balance weight nipple and smaller than the diameter of the insert located at the upper part of the rim.

[0058] Specifically, if the diameter of the rim insertion hole is 7.8 mm, the maximum diameter of the upper part of the balance weight can be adjusted to approximately 7.6 mm.

[0059] The length of the upper part of the weight can be determined by converting the total volume of the balance weight, the density of the material, and the target compensation mass value in reverse.

[0060]

[0061] At this time, the length of the nipple-shaped balance weight increases as the mass to be compensated increases. In this case, if the diameter to length ratio of the balance weight is excessively large, the balance weight can be divided into a base and an extension.

[0062] More specifically, the balance weight nipple may be an extended structure including a balance weight nipple base portion including a lower portion of a balance weight nipple base portion that includes a cylindrical protrusion, a cross-sectional portion for fastening a tool, a tapered portion that contacts a rim, and an internal fastening portion to which a spoke is fastened and located within the protrusion; an upper portion of a balance weight base portion that is integrally connected to the lower portion of the balance weight nipple base portion and has a round cylindrical shape; and a balance weight nipple extension portion that is fastened to the upper portion of the balance weight nipple base portion and has a function of adjusting the weight balance of the rim.

[0063] The above balance weight nipple base and balance weight nipple extension may both be made of a metal or alloy having a higher density than aluminum alloy. The metal may be brass, tungsten, or at least one of their alloys. The description thereof is as described above.

[0064] The description of the diameter of the balance weight nipple base and the balance weight nipple extension is the same as described above, so it is omitted.

[0065] The balance weight nipple may be positioned at the upper end of the base portion and may further include a protrusion for use with a tool. Examples of specific tools include a hexagonal or square socket wrench.

[0066] The above protrusion may further include a stop ring positioned on the surface thereof and capable of maintaining a fastening position when fastened with the balance weight nipple extension. The balance weight nipple extension may include an internal fastening portion that can be fastened with the protrusion, and may have a groove for the stop ring inside the fastening portion.

[0067] It may further include a rubber ring positioned on the above protrusion and fitted between the balance weight nipple extension and the balance weight nipple base.

[0068] The above balance weight nipple base and extension can be fastened through the mechanical restraint of the C-shaped stop ring and the compressive force of the rubber ring.

[0069] The above balance weight nipple extension may further include a protrusion for tool use, positioned at one end. For example, a tool with a bolt attached to it may be inserted into a threaded hole at the top of the balance weight extension to connect or disconnect the extension from the base.

[0070] The overall description is omitted as it is identical to the detailed configuration of the aforementioned integrated balance weight nipple.

[0071]

[0072] As previously mentioned, the balance weight nipple may be manufactured as an integral structure, with the entire structure positioned within the rim. In this case, the protrusion for engagement with the spoke may be inserted or omitted within the basic balance weight configuration.

[0073] For example, the balance weight nipple may have a round cylinder shape, an internal fastening portion provided inside the rim without a protrusion, and having a spoke fastened therein; a tapered portion in contact with the rim; and a protrusion located at the top of the cylinder for use with a tool.

[0074] As another example, the balance weight nipple may be an extended structure including an internal fastening portion provided inside the rim without a protrusion and having a spoke fastened therein; and a tapered-shaped portion that comes into contact with the rim; a balance weight nipple base portion having a round cylinder shape; and a balance weight nipple extension portion that is fastened to the balance weight nipple base portion and has a function of adjusting the weight balance of the rim.

[0075] The detailed configuration description of these structures is the same as the other implementation examples mentioned above, except that there are no protrusions for spoke fastening, and thus the description thereof is omitted.

[0076]

[0077] Below, an example of correcting an unbalanced mass using the balance weight nipple mentioned above is described.

[0078] Figure 6 is a schematic diagram illustrating a method for calculating the unbalanced mass and compensation mass of a wheel.

[0079] Unbalanced mass is measured by measuring the amount of radial up-and-down vibration that occurs when the wheel rotates. Once the position and size of the mass are calculated, the correction mass It must be inserted in the opposite position and have the same size as the unbalanced mass.

[0080] However, since the balance weight nipple of the present invention must be connected with spokes having a fixed interval and a limited number, two consecutive ones ( The spokes and each balance weight ( Use .

[0081] Total number of spokes , correction mass and The angle with the second spoke , correction mass and ( The angle with the second spoke That is, the ideal correction mass generated as the wheel rotates Centrifugal force due to the actual distributed mass Since it is equal to the resultant force of the centrifugal force, it satisfies the equation below.

[0082] ,

[0083]

[0084] Through this, the following equation can be obtained (however, the correction mass, th, ( +1) The distance between the th distributed mass and the center of the wheel is equal to r, and the rotational angular velocity ).

[0085]

[0086]

[0087]

[0088]

[0089]

[0090] For example, if the number of spokes n is 4, 16, 32, As it increases, it changes It is as shown in Figs. 7 to 9.

[0091] The smaller the number of spokes, the more ideal the compensation mass. Sum of the actual distributed installation masses compared to It can be confirmed that there is a large deviation from .

[0092] In practical application, the balance weight of the present invention is i) manufactured in units within the range of the allowable unbalanced mass of a high-performance bicycle wheel (e.g., in units of 1.0 g), and ii) or If the size is sufficiently small, manufacturing costs can be reduced and productivity increased by applying only one single unit.

[0093]

[0094] The present invention is not limited to the above-described embodiments and / or examples, but can be manufactured in various different forms. Those skilled in the art will understand that the present invention can be implemented in other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the above-described embodiments and / or examples should be understood as illustrative in all respects and not restrictive.

[0095]

[0096] [Explanation of symbols]

[0097] 100: Integrated Balanced Weight Nipple

[0098] 101: Integrated Balance Weight Nipple Bottom

[0099] 102: Integrated balance weight nipple top

[0100] 103: Spoke

[0101] 104: Rim

[0102] 200: Extended Balance Weight Nipple

[0103] 201: Extended Balance Weight Nipple Base

[0104] 202: Extended Balance Weight Nipple Extension

[0105] 203: Stop ring

[0106] 204: Rubber ring

[0107] 300: Built-in / integrated balance weight nipple

[0108] 401: Built-in / Extended Balance Weight Nipple Base

[0109] 402: Built-in / Extended Balance Weight Nipple Extension

Claims

1. A nipple that is connected to one end of a spoke that supports a rim; including: The above nipple is a balance weight nipple that adjusts the weight balance of the above rim.

2. In paragraph 1, The above balance weight nipple, A balance weight nipple lower portion comprising a cylindrical projection, a cross-sectional portion for tool attachment, a tapered portion in contact with the rim, and an internal attachment portion positioned within the projection to which a spoke is attached; and It includes a balance weight nipple upper part which is integrally connected to the lower part of the above balance weight nipple and has a round cylinder shape; Balanced weight nipple with integrated structure.

3. In paragraph 2, A balance weight nipple, which is positioned at one end of the upper portion of the above balance weight nipple and further includes a protrusion for tool use.

4. In paragraph 2, The material of the above balance weight nipple is a metal or alloy having a higher density than aluminum alloy.

5. In paragraph 4, A balance weight nipple, wherein the metal is at least one of brass, tungsten, or an alloy thereof.

6. In paragraph 2, A balance weight nipple having an upper portion thereof that functions to adjust the weight balance of the rim, and having a diameter that is larger than the diameter of the lower portion of the balance weight nipple and smaller than the diameter of the insert located at the upper portion of the rim.

7. In paragraph 1, The above balance weight nipple, A balance weight nipple base portion including a lower portion of a balance weight nipple base portion, which includes a cylindrical protrusion, a cross-section for fastening a tool, a tapered portion in contact with a rim, and an internal fastening portion to which a spoke is fastened and located within the protrusion; a balance weight nipple base portion including an upper portion of the balance weight base portion, which is integrally connected to the lower portion of the balance weight nipple base portion and has a round cylindrical shape; and A balance weight nipple extension that is connected to the upper part of the above balance weight nipple base and has the function of adjusting the weight balance of the rim, Balanced weight nipple with extended structure.

8. In paragraph 7, A balance weight nipple, which is located at the upper end of the above balance weight nipple base and further includes a protrusion for tool use.

9. In paragraph 8, A balance weight nipple further comprising a stop ring positioned on the protruding surface and capable of maintaining a fastening position when fastened with the balance weight nipple extension.

10. In paragraph 9, The above balance weight nipple extension includes an internal fastening portion that can be fastened to the above protrusion, A balance weight nipple having a groove for the stop ring inside the above-mentioned fastening portion.

11. In paragraph 8, A balance weight nipple further comprising a rubber ring positioned on the protrusion and fitted between the balance weight nipple extension and the balance weight nipple base.

12. In paragraph 7, A balance weight nipple, which is positioned at one end of the above balance weight nipple extension and further includes a protrusion for tool use.

13. In paragraph 1, The above balance weight nipple is in the shape of a round cylinder and is provided inside the rim without any protrusions. An inner fastening portion into which a spoke is fastened; a tapered shape portion that contacts the rim; and a protrusion located at the top of the cylinder for use with a tool. Balance weight nipples.

14. In paragraph 2, The above balance weight nipple is provided inside the rim without a protrusion, A balance weight nipple base portion having a round cylinder shape, including an inner fastening portion into which a spoke is fastened; and a tapered shape portion that contacts the rim; and A balance weight nipple extension that is connected to the above balance weight nipple base and has the function of adjusting the weight balance of the rim, Balanced weight nipple with extended structure.

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