TWM452902U - Protective shield of bicycle sprocket - Google Patents
Protective shield of bicycle sprocket Download PDFInfo
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- TWM452902U TWM452902U TW101217078U TW101217078U TWM452902U TW M452902 U TWM452902 U TW M452902U TW 101217078 U TW101217078 U TW 101217078U TW 101217078 U TW101217078 U TW 101217078U TW M452902 U TWM452902 U TW M452902U
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- sprocket
- mounting
- bicycle
- guard
- body portion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J13/00—Guards for chain, chain drive or equivalent drive, e.g. belt drive
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Description
本創作係關於一種鏈輪防護罩，特別是關於保護自行車之鏈輪的用於自行車之鏈輪防護罩。The present invention relates to a sprocket guard, and more particularly to a bicycle sprocket guard for protecting a bicycle sprocket.
自行車之鏈輪，特別是前鏈輪於障礙物碰撞時，可能導致鏈輪之鏈輪齒遭受損傷。因此，先前習知有可裝設於鏈輪上之鏈輪防護罩(例如參照美國專利申請公開第2006/0058139號說明書)。先前之鏈輪防護罩，係藉由將自行車之鏈輪安裝於曲柄組件的螺絲部件而安裝於鏈輪上。鏈輪防護罩形成環狀，其具有比鏈輪之最大徑大的外徑。The sprocket of a bicycle, especially when the front sprocket collides with an obstacle, may cause damage to the sprocket of the sprocket. Accordingly, a sprocket guard that can be mounted on a sprocket is known in the prior art (see, for example, U.S. Patent Application Publication No. 2006/0058139). The previous sprocket guard was attached to the sprocket by attaching the bicycle sprocket to the screw member of the crank assembly. The sprocket guard is formed in an annular shape having an outer diameter that is larger than a maximum diameter of the sprocket.
先前之鏈輪防護罩，因為障礙物在碰撞鏈輪之前先碰撞鏈輪防護罩，所以可保護鏈輪。但是，障礙物碰撞鏈輪防護罩時，會導致鏈輪防護罩塑性變形。The previous sprocket guard protects the sprocket because it obstructs the sprocket guard before it hits the sprocket. However, when the obstacle hits the sprocket guard, the sprocket guard will be plastically deformed.
本創作之課題為提供一種用於自行車之鏈輪防護罩，即使障礙物碰撞時，仍不易塑性變形。The object of this creation is to provide a sprocket guard for bicycles that is not easily plastically deformed even when an obstacle collides.
創作1的用於自行車之鏈輪防護罩具備本體部與緩衝部件。本體部具有鏈輪保護部。緩衝部件緩和障礙物碰撞本體部時之撞擊。The sprocket guard for bicycles of the creation 1 has a body portion and a cushioning member. The body portion has a sprocket protection portion. The cushioning member mitigates the impact of the obstacle colliding with the body portion.
該用於自行車之鏈輪防護罩係於障礙物碰撞本體部時，藉由緩衝部件吸收其撞擊以緩和撞擊。藉此，即使障礙物碰撞，仍不易塑性變形。The sprocket cover for a bicycle is adapted to absorb the impact by the cushioning member when the obstacle collides with the body portion to mitigate the impact. Thereby, even if the obstacle collides, it is not easy to plastically deform.
創作2的用於自行車之鏈輪防護罩，如創作1的用於自行 車之鏈輪防護罩，其中本體部至少具有一個安裝部。緩衝部件配置於安裝部。該情況下，由於緩衝部件配置於安裝部，因此緩衝部件之安裝容易。Creation 2 sprocket cover for bicycles, such as creation 1 for self A sprocket cover for a vehicle, wherein the body portion has at least one mounting portion. The cushioning member is disposed at the mounting portion. In this case, since the cushion member is disposed in the attachment portion, the attachment of the cushion member is easy.
創作3的用於自行車之鏈輪防護罩，如創作2的用於自行車之鏈輪防護罩，其中安裝部係安裝孔，緩衝部件配置於安裝孔之內周面。該情況下，由於緩衝部件配置於安裝孔之內周面，因此可使螺絲部件等貫穿於安裝孔而安裝緩衝部件。The sprocket guard for bicycles of the creation 3, such as the sprocket guard for bicycles of the creation 2, wherein the mounting portion is a mounting hole, and the cushioning member is disposed on the inner circumferential surface of the mounting hole. In this case, since the cushion member is disposed on the inner circumferential surface of the attachment hole, the screw member or the like can be inserted into the attachment hole to mount the cushion member.
創作4的用於自行車之鏈輪防護罩，如創作3的用於自行車之鏈輪防護罩，其中安裝孔與用於自行車之曲柄組件的鏈輪安裝孔同芯配置。該情況下，可同時進行鏈輪之安裝、鏈輪防護罩之安裝及緩衝部件之安裝。The sprocket guard for bicycles of the creation 4, such as the sprocket guard for bicycles of the creation 3, wherein the mounting holes are arranged in the same core as the sprocket mounting holes for the crank assembly of the bicycle. In this case, the installation of the sprocket, the installation of the sprocket guard, and the installation of the cushioning member can be performed at the same time.
創作5的用於自行車之鏈輪防護罩，如創作3的用於自行車之鏈輪防護罩，其中安裝孔配置於與用於自行車之曲柄組件的鏈輪安裝孔不同位置。該情況下，可將緩衝部件安裝於任意位置。The sprocket guard for bicycles of the creation 5, such as the sprocket guard for bicycles of the creation 3, wherein the mounting holes are disposed at different positions from the sprocket mounting holes for the crank assembly for bicycles. In this case, the cushioning member can be attached to any position.
創作6的用於自行車之鏈輪防護罩，如創作3的用於自行車之鏈輪防護罩，其中緩衝部件配置成與裝設於安裝孔之安裝螺栓及安裝螺帽中的至少一方接觸。該情況下，可在安裝孔與安裝螺栓及安裝螺帽中的至少一方之間吸收撞擊。The sprocket cover for bicycles of the creation 6, such as the sprocket cover for bicycles of the creation 3, wherein the cushioning member is configured to be in contact with at least one of the mounting bolts and the mounting nuts provided in the mounting holes. In this case, the impact can be absorbed between the mounting hole and at least one of the mounting bolt and the mounting nut.
創作7的用於自行車之鏈輪防護罩，如創作3的用於自行車之鏈輪防護罩，其中本體部具有複數個安裝孔。該情況下，可在數個安裝孔中吸收撞擊。The sprocket guard for bicycles of the creation 7, such as the sprocket guard for bicycles of the creation 3, wherein the body portion has a plurality of mounting holes. In this case, the impact can be absorbed in several mounting holes.
創作8的用於自行車之鏈輪防護罩，如創作7的用於自行車之鏈輪防護罩，其中本體部具有一對安裝孔。該情況下，可藉由一對安裝孔穩定安裝鏈輪防護罩，並且可在2個部位吸收撞擊。The sprocket cover for bicycles of the creation 8, such as the sprocket cover for bicycles of the creation 7, wherein the body portion has a pair of mounting holes. In this case, the sprocket guard can be stably mounted by a pair of mounting holes, and the impact can be absorbed at two places.
創作9的用於自行車之鏈輪防護罩，如創作8的用於自行車之鏈輪防護罩，其中鏈輪保護部在周方向，形成於一對安裝孔之間延伸。該情況下，由於鏈輪保護部以兩端支撐，因此可維持鏈輪保護部之高強度。A sprocket guard for a bicycle, such as the sprocket guard for bicycles of the creation 8, wherein the sprocket guard extends in a circumferential direction between a pair of mounting holes. In this case, since the sprocket protecting portion is supported at both ends, the high strength of the sprocket protecting portion can be maintained.
創作10的用於自行車之鏈輪防護罩，如創作8的用於自行車之鏈輪防護罩，其中一對安裝孔與用於自行車之曲柄組件的一對鏈輪安裝孔同芯配置。該情況下，可同時進行鏈輪之安裝、鏈輪防護罩之安裝及緩衝部件之安裝。A sprocket guard for a bicycle 10, such as the sprocket guard for bicycles of the creation 8, wherein a pair of mounting holes are disposed in the same core as a pair of sprocket mounting holes for a crank assembly for a bicycle. In this case, the installation of the sprocket, the installation of the sprocket guard, and the installation of the cushioning member can be performed at the same time.
創作11的用於自行車之鏈輪防護罩，如創作2的用於自行車之鏈輪防護罩，其中安裝部係突起。該情況下，可藉由使突起卡合於凹部而安裝本體部。The sprocket guard for bicycles of the creation 11, such as the sprocket guard for bicycles of the creation 2, wherein the mounting portion is raised. In this case, the body portion can be attached by engaging the protrusion with the recess.
創作12的用於自行車之鏈輪防護罩，如創作1的用於自行車之鏈輪防護罩，其中緩衝部件係熱可塑性彈性體。該情況下，因為熱可塑性彈性體之密度比合成橡膠低，所以可謀求緩衝部件之輕量化。A sprocket cover for a bicycle, such as the sprocket cover for bicycles of the creation 1, wherein the cushioning member is a thermoplastic elastomer. In this case, since the density of the thermoplastic elastomer is lower than that of the synthetic rubber, the weight of the cushion member can be reduced.
創作13的用於自行車之鏈輪防護罩，如創作12的用於自行車之鏈輪防護罩，其中緩衝部件係環狀部件。該情況下，容易將緩衝部件安裝於孔之周圍。The sprocket guard for bicycles of creation 13, such as the sprocket guard for bicycles of creation 12, wherein the cushioning member is an annular member. In this case, it is easy to attach the cushioning member around the hole.
創作14的用於自行車之鏈輪防護罩，如創作1的用於自行車之鏈輪防護罩，其中本體部係鋁製。該情況下，容易將本體部維持強度且輕量化。The sprocket cover for bicycles of creation 14, such as the sprocket cover for bicycles of the creation 1, wherein the body portion is made of aluminum. In this case, it is easy to maintain the strength and weight of the main body portion.
創作15的用於自行車之鏈輪防護罩，如創作1的用於自行車之鏈輪防護罩，其中鏈輪保護部係本體部之外周緣部的一部分，且鏈輪保護部以外之外周緣部的至少一部分形成錐形面。該情況下，可藉由形成於障礙物不易接觸之位置的錐形面之彈性變形而吸收撞擊。A sprocket cover for a bicycle, such as the sprocket cover for bicycles of the creation 1, wherein the sprocket protection portion is a part of a peripheral portion of the body portion and a peripheral portion other than the sprocket protection portion At least a portion of the portion forms a tapered surface. In this case, the impact can be absorbed by elastic deformation of the tapered surface formed at a position where the obstacle is not easily contacted.
創作16的用於自行車之鏈輪防護罩，如創作15的用於自行車之鏈輪防護罩，其中錐形面之錐角係45度。該情況下，可藉由通常之C倒角加工而形成錐形面。The sprocket guard for bicycles, such as the sprocket guard for bicycles, is created 16 wherein the taper angle of the tapered surface is 45 degrees. In this case, a tapered surface can be formed by a normal C chamfering process.
創作17的用於自行車之鏈輪防護罩，具有本體部，其具有鏈輪保護部。鏈輪保護部係本體部之外周緣部的一部分，且在鏈輪保護部以外之外周緣部的至少一部分形成錐形面。The sprocket guard for bicycles of the creation 17 has a body portion having a sprocket protection portion. The sprocket protecting portion is a part of the outer peripheral portion of the main body portion, and at least a part of the peripheral portion other than the sprocket protecting portion forms a tapered surface.
該情況下，不設緩衝部件，而藉由錐形面之彈性變形吸收撞擊，可防止鏈輪保護部之塑性變形。In this case, the cushion member is not provided, and the impact is absorbed by the elastic deformation of the tapered surface, thereby preventing plastic deformation of the sprocket guard.
創作18的用於自行車之鏈輪防護罩，如創作17的用於自行車之鏈輪防護罩，其中錐形面之錐角係45度。該情況下，可藉由通常之C倒角加工而形成錐形面。The sprocket guard for bicycles, such as the sprocket guard for bicycles, of the creation 18, wherein the taper angle of the tapered surface is 45 degrees. In this case, a tapered surface can be formed by a normal C chamfering process.
按照本創作，當障礙物碰撞本體部時，藉由緩衝部件吸收其撞擊，以緩和撞擊。藉此，即使障礙物碰撞，仍不易塑性變形。According to the present creation, when an obstacle collides with the body portion, the impact is absorbed by the cushioning member to alleviate the impact. Thereby, even if the obstacle collides, it is not easy to plastically deform.
按照本創作之另外樣態，不設緩衝部件，而藉由錐形面之彈性變形吸收撞擊，可防止鏈輪保護部之塑性變形。According to another aspect of the present invention, the cushioning member is not provided, and the elastic deformation of the tapered surface absorbs the impact, thereby preventing plastic deformation of the sprocket guard.
本創作第一種實施形態的用於自行車之鏈輪防護罩(以下簡稱為鏈輪防護罩)10，係為了防止安裝於曲柄組件12之鏈輪14，特別是鏈輪齒14a因障礙物碰撞導致塑性變形而設。因而，第一種實施形態係以將鏈輪防護罩10配置於鏈輪14之容易與障礙物碰撞的部分之方式，夾著曲柄組件12之曲柄支臂12a而設置一對鏈輪防護罩10。The bicycle sprocket guard (hereinafter referred to simply as the sprocket guard) 10 of the first embodiment of the present invention is for preventing the sprocket 14 attached to the crank assembly 12, particularly the sprocket tooth 14a from colliding with an obstacle. Cause plastic deformation. Therefore, the first embodiment is provided with a pair of sprocket guards 10 sandwiching the crank arms 12a of the crank assembly 12 in such a manner that the sprocket guard 10 is disposed on a portion of the sprocket 14 that easily collides with an obstacle. .
如第一圖及第二圖所示，鏈輪14配置於放射狀配置之曲柄組件12的複數個(例如4個)鏈輪安裝支臂12b上。具體而言，係在分別設於鏈輪安裝支臂12b之前端的鏈輪安裝孔12c中，藉由螺栓部件16及螺帽部件18固定鏈輪14。因而，鏈輪14中，在內周側形成可與鏈輪安裝孔12c相對而配置之附階的複數個(例如4個)貫穿孔14b。As shown in the first and second figures, the sprocket 14 is disposed on a plurality of (e.g., four) sprocket mounting arms 12b of the radially disposed crank assembly 12. Specifically, the sprocket 14 is fixed by the bolt member 16 and the nut member 18 in the sprocket mounting hole 12c provided at the front end of the sprocket mounting arm 12b. Therefore, in the sprocket 14, a plurality of (for example, four) through holes 14b which are arranged to face the sprocket mounting hole 12c are formed on the inner peripheral side.
螺栓部件16及螺帽部件18係分別具有大徑之頭部16a及頭部18a的中空部件。在螺栓部件16之頭部16a中形成工具卡扣部16b。在螺帽部件18之頭部18a中形成工具卡扣部18b。The bolt member 16 and the nut member 18 each have a hollow member having a large diameter head portion 16a and a head portion 18a. A tool catching portion 16b is formed in the head portion 16a of the bolt member 16. A tool catching portion 18b is formed in the head portion 18a of the nut member 18.
如第二圖所示，第一種實施形態之鏈輪防護罩10配置於 鏈輪14之外側面。鏈輪防護罩10具有本體部20、及設於本體部20之緩衝部件22。如第二圖及第三圖所示，本體部20具有用於保護鏈輪14之鏈輪保護部24、由一對安裝孔26a構成之安裝部26、及錐形面28。鏈輪保護部24宜以保護鏈輪14之齒尖，及掛載於鏈輪14上之鏈條外周面兩者的方式，延伸於比鏈輪14徑方向外側而形成。As shown in the second figure, the sprocket guard 10 of the first embodiment is disposed on The outer side of the sprocket 14 is. The sprocket guard 10 has a body portion 20 and a cushioning member 22 provided on the body portion 20. As shown in the second and third figures, the main body portion 20 has a sprocket protecting portion 24 for protecting the sprocket 14, a mounting portion 26 composed of a pair of mounting holes 26a, and a tapered surface 28. The sprocket guard portion 24 is preferably formed to extend outward of the sprocket 14 in the radial direction so as to protect both the tip of the sprocket 14 and the outer peripheral surface of the chain attached to the sprocket 14.
本體部20宜為鋁製。鏈輪保護部24係本體部20之外周緣部20a的一部分。鏈輪保護部24以位於比鏈輪14之鏈輪齒14a徑方向外方的方式，配置於本體部20徑方向外側之外周緣部20a。鏈輪保護部24在鏈輪14之周方向，以在一對安裝孔26a之間延伸的方式，彎曲成圓弧狀而形成。外周緣部20a之鏈輪14行進方向的旋轉方向下游側之前端緣部20b，對鏈輪14之徑方向，朝向旋轉方向上游側傾斜。外周緣部20a之旋轉方向上游側的基端緣部20c，概略沿著鏈輪14之徑方向而形成。外周緣部20a之徑方向內側的內側緣部20d概略形成圓弧狀。The body portion 20 is preferably made of aluminum. The sprocket guard portion 24 is a part of the outer peripheral edge portion 20a of the main body portion 20. The sprocket guard portion 24 is disposed outside the sprocket 14a of the sprocket 14 in the radial direction, and is disposed on the outer peripheral edge portion 20a of the main body portion 20 in the radial direction. The sprocket guard portion 24 is formed by being curved in an arc shape so as to extend between the pair of attachment holes 26a in the circumferential direction of the sprocket 14. The front edge portion 20b on the downstream side in the rotation direction of the sprocket 14 in the traveling direction of the outer peripheral edge portion 20a is inclined toward the upstream side in the rotational direction with respect to the radial direction of the sprocket 14. The proximal end edge portion 20c on the upstream side in the rotational direction of the outer peripheral edge portion 20a is formed substantially along the radial direction of the sprocket 14. The inner edge portion 20d on the inner side in the radial direction of the outer peripheral edge portion 20a is formed in an arc shape.
安裝孔26a與曲柄組件12之一對鏈輪安裝孔12c同芯配置，可與鏈輪安裝孔12c相對。安裝孔26a具有在內周面收納螺栓部件16之頭部16a的頭部收納部26b、螺栓部件16可貫穿之貫穿部26c、及裝設緩衝部件22之緩衝部件裝設部26d。頭部收納部26b之直徑比貫穿部26c大，且比緩衝部件裝設部26d小。貫穿部26c之直徑與鏈輪安裝孔12c概同。貫穿部26c具有螺帽部件18可通過之內徑。但是，螺帽部件18之前端部不延伸至貫穿部26c，而配置於緩衝部件22之內周側。因此，在貫穿部26c與螺栓部件16之間大致形成螺帽部件18之厚度部分的間隙。此外，在螺栓部件16之頭部16a與頭部收納部26b之間，亦形成有當撞擊作用於本體部20時，本體部20對螺栓部件16可在第二圖上下方向移動的間隙。The mounting hole 26a is disposed in the same core as the sprocket mounting hole 12c and one of the crank assemblies 12, and is opposite to the sprocket mounting hole 12c. The attachment hole 26a has a head housing portion 26b that houses the head portion 16a of the bolt member 16 on the inner circumferential surface, a penetration portion 26c through which the bolt member 16 can pass, and a cushion member mounting portion 26d on which the cushion member 22 is attached. The head housing portion 26b has a larger diameter than the penetration portion 26c and is smaller than the cushion member mounting portion 26d. The diameter of the penetrating portion 26c is the same as that of the sprocket mounting hole 12c. The penetration portion 26c has an inner diameter through which the nut member 18 can pass. However, the front end portion of the nut member 18 does not extend to the penetrating portion 26c, but is disposed on the inner peripheral side of the cushioning member 22. Therefore, a gap of a thickness portion of the nut member 18 is substantially formed between the penetrating portion 26c and the bolt member 16. Further, between the head portion 16a of the bolt member 16 and the head housing portion 26b, a gap in which the body portion 20 can move the bolt member 16 in the vertical direction of the second drawing when the impact acts on the body portion 20 is also formed.
錐形面28係為了降低本體部20之一部分剛性，使本體部20彈性變形容易而設。如第三圖之網格部分所示，錐形面28 設於除了障礙物碰撞可能性高之鏈輪保護部24的本體部20之外周緣部20a。設置錐形面28係為了藉由彈性變形而吸收撞擊。錐形面28具有形成於本體部20之徑方向內側緣部20d的第一錐形面28a、及形成於前端緣部20b之第二錐形面28b。因為內側緣部20d從圓弧狀之部分一部分凹入，所以第一錐形面28a亦形成於從圓弧狀部分凹入之部分。如第四圖所示，第一錐形面28a及第二錐形面28b之錐角α，宜分別為45度。第一錐形面28a連接於厚度比其他部分薄之薄部28c。因而，可進一步降低剛性，彈性變形更容易。The tapered surface 28 is provided to reduce the rigidity of one portion of the main body portion 20 and to elastically deform the main body portion 20. As shown in the grid portion of the third figure, the tapered surface 28 The peripheral portion 20a is provided outside the main body portion 20 of the sprocket guard portion 24, which is highly likely to collide with an obstacle. The tapered surface 28 is provided to absorb the impact by elastic deformation. The tapered surface 28 has a first tapered surface 28a formed on the radially inner side edge portion 20d of the main body portion 20, and a second tapered surface 28b formed at the front end edge portion 20b. Since the inner edge portion 20d is recessed from a portion of the arcuate portion, the first tapered surface 28a is also formed in a portion recessed from the arcuate portion. As shown in the fourth figure, the taper angle α of the first tapered surface 28a and the second tapered surface 28b should be 45 degrees, respectively. The first tapered surface 28a is connected to the thin portion 28c which is thinner than the other portions. Therefore, the rigidity can be further reduced, and the elastic deformation is easier.
緩衝部件22為烯烴系熱可塑性彈性體。例如係TPO樹脂製。如前述，緩衝部件22裝設於第二圖所示之環狀部件裝設部26d，係為了障礙物碰撞本體部20時緩和撞擊而設。具體而言，係吸收撞擊而緩和撞擊。如第五圖所示，緩衝部件22係環狀部件。如第二圖及第六圖所示，緩衝部件22之內周面22a接觸於螺帽部件18，外周面22b及前端面22c接觸於緩衝部件收納部26d。此外，基端面22d接觸於鏈輪安裝支臂12b。緩衝部件22之外周面，為了容易插入緩衝部件裝設部26d，而由朝向前端面22c稍微縮徑之錐形面構成。外周面22b與前端面22c之邊界部形成R倒角。基端面22d與外周面22b之邊界部形成C倒角。內周面22a與基端面22d之邊界部，以比前端面22c與外周面22b小之半徑形成R倒角。The cushioning member 22 is an olefin-based thermoplastic elastomer. For example, it is made of TPO resin. As described above, the cushion member 22 is attached to the annular member mounting portion 26d shown in the second figure, and is provided to relieve the impact when the obstacle collides with the main body portion 20. Specifically, the impact is absorbed to mitigate the impact. As shown in the fifth figure, the cushioning member 22 is an annular member. As shown in the second and sixth figures, the inner circumferential surface 22a of the cushioning member 22 is in contact with the nut member 18, and the outer circumferential surface 22b and the front end surface 22c are in contact with the cushioning member housing portion 26d. Further, the base end face 22d is in contact with the sprocket mounting arm 12b. The outer peripheral surface of the cushioning member 22 is formed of a tapered surface that is slightly reduced in diameter toward the distal end surface 22c so as to be easily inserted into the cushioning member mounting portion 26d. The boundary portion between the outer peripheral surface 22b and the front end surface 22c forms an R chamfer. The boundary portion between the base end surface 22d and the outer peripheral surface 22b forms a C chamfer. The boundary portion between the inner circumferential surface 22a and the base end surface 22d forms an R chamfer with a smaller radius than the front end surface 22c and the outer circumferential surface 22b.
將鏈輪防護罩10安裝於鏈輪14上時，取下將鏈輪14安裝於曲柄組件12之2支螺栓部件16及螺帽部件18。而後，以安裝孔26a與鏈輪安裝孔12c相對之方式，配置緩衝部件裝設部26d中裝設有緩衝部件22之鏈輪防護罩10。其次，從安裝孔26a側插入螺栓部件16，並且從鏈輪14側插入螺帽部件18，使螺栓部件16對螺帽部件18相對旋轉。藉此，將鏈輪防護罩10固定於鏈輪14。When the sprocket guard 10 is attached to the sprocket 14, the two bolt members 16 and the nut members 18 that attach the sprocket 14 to the crank assembly 12 are removed. Then, the sprocket guard 10 in which the cushioning member 22 is mounted is disposed in the cushion member mounting portion 26d so that the mounting hole 26a faces the sprocket mounting hole 12c. Next, the bolt member 16 is inserted from the side of the mounting hole 26a, and the nut member 18 is inserted from the side of the sprocket 14 to relatively rotate the bolt member 16 against the nut member 18. Thereby, the sprocket guard 10 is fixed to the sprocket 14.
裝設有此種鏈輪防護罩10之自行車，在路面，特別是在不平路面行駛時，當障礙物碰撞鏈輪防護罩10時，緩衝部件 22壓縮變形吸收撞擊，而緩和撞擊。藉此，鏈輪防護罩10不易塑性變形。a bicycle equipped with such a sprocket guard 10, when the obstacle hits the sprocket guard 10 on the road surface, especially on uneven road surface, the cushioning member 22 compression deformation absorbs the impact while mitigating the impact. Thereby, the sprocket guard 10 is not easily plastically deformed.
第一種實施形態係以安裝孔26a構成安裝部26，而變形例則如第七圖所示，係以與第一種實施形態相同形態之安裝孔26a構成鏈輪防護罩110之一方安裝部26。但是，另一方安裝部126以開口於徑方向內側之縫隙126a構成。該情況下，因為可以安裝部26作為中心搖動，所以可調整鏈輪防護罩110之安裝位置。其他構成與第一種實施形態同樣。In the first embodiment, the mounting portion 26 is formed by the mounting hole 26a, and in the modified example, as shown in the seventh embodiment, the mounting hole 26a of the same configuration as the first embodiment constitutes one of the mounting portions of the sprocket guard 110. 26. However, the other attachment portion 126 is configured by a slit 126a that opens in the radial direction. In this case, since the mounting portion 26 can be shaken as a center, the mounting position of the sprocket guard 110 can be adjusted. The other configuration is the same as that of the first embodiment.
第一種實施形態係將緩衝部件22配置於安裝部26，而第二種實施形態如第八圖所示，係將鏈輪防護罩210之緩衝部件222設於與安裝部226不同之位置。緩衝部件222沿著本體部220之外周緣部220a配置。具體而言，緩衝部件222係在外周緣部220a及其周圍表面以網格表示之位置，例如藉由插入成形等一體成形法，一體形成熱可塑性彈性體。此外，亦可藉由接著而將緩衝部件222固定於外周緣部220a。因此，第二種實施形態成為緩衝部件兼用鏈輪保護部之構成。In the first embodiment, the cushioning member 22 is disposed on the mounting portion 26, and in the second embodiment, as shown in the eighth embodiment, the cushioning member 222 of the sprocket guard 210 is disposed at a position different from the mounting portion 226. The cushioning member 222 is disposed along the outer peripheral edge portion 220a of the body portion 220. Specifically, the cushioning member 222 integrally forms the thermoplastic elastomer at a position indicated by a grid on the outer peripheral edge portion 220a and its peripheral surface, for example, by an integral molding method such as insert molding. Further, the cushion member 222 may be fixed to the outer peripheral edge portion 220a by following. Therefore, the second embodiment is configured as a cushion member and a sprocket protecting portion.
在第二種實施形態之安裝部226的安裝孔226a中並未設緩衝部件收納部，而僅設貫穿部與頭部收納部。不過，亦可在安裝孔226a中設緩衝部件收納部，進一步裝設第一種實施形態之緩衝部件22。In the attachment hole 226a of the attachment portion 226 of the second embodiment, the cushion member storage portion is not provided, and only the penetration portion and the head storage portion are provided. However, a cushion member accommodating portion may be provided in the attachment hole 226a, and the cushion member 22 of the first embodiment may be further attached.
第二種實施形態由於在障礙物碰撞之部分設置緩衝部件222，因此容易吸收撞擊。其他構成與第一種實施形態同樣。In the second embodiment, since the cushioning member 222 is provided at the portion where the obstacle collides, the impact is easily absorbed. The other configuration is the same as that of the first embodiment.
第九圖中之第二種實施形態的變形例，係在比本體部320之外周端部320a徑方向內側形成有圓弧狀之縫隙320e。在該縫隙320e內裝設有緩衝部件322。緩衝部件322使用熱可塑性彈性體。緩衝部件322藉由接著或插入成形等適當的固定方法而固定於縫隙320e內。其他構成與第一種實施形態同樣。In the modification of the second embodiment in the ninth embodiment, an arc-shaped slit 320e is formed on the inner side in the radial direction of the outer peripheral end portion 320a of the main body portion 320. A buffer member 322 is mounted in the slit 320e. The cushioning member 322 uses a thermoplastic elastomer. The cushioning member 322 is fixed in the slit 320e by an appropriate fixing method such as follow-up or insert molding. The other configuration is the same as that of the first embodiment.
第十圖、第十一圖及第十二圖中，第三種實施形態之鏈輪防護罩410並非固定於鏈輪14之外側面，而係固定於可固定在圖上未顯示之自行車車架的懸吊部402之固定托架404上。固定托架404在周緣部具有用於安裝鏈輪防護罩410之3個貫穿孔404a。兩端之貫穿孔404a係供螺栓部件416螺合之母螺絲孔。In the tenth, eleventh, and twelfth drawings, the sprocket guard 410 of the third embodiment is not fixed to the outer side of the sprocket 14, but is fixed to a bicycle that can be fixed to the bicycle not shown. The suspension portion 402 of the frame is fixed to the bracket 404. The fixing bracket 404 has three through holes 404a for attaching the sprocket guard 410 at the peripheral portion. The through holes 404a at both ends are screw holes for screwing the bolt member 416.
鏈輪防護罩410與第一及第二種實施形態不同，係配置於鏈輪14與懸吊部402之間。因此，配置於比鏈輪14靠近車架側。鏈輪防護罩410具有本體部420及緩衝部件422(參照第十一圖及第十二圖)。本體部420具有用於保護鏈輪14之鏈輪保護部424、一對第一安裝部426、及配置於一對第一安裝部426之間的第二安裝部427。第一安裝部426及第二安裝部427係安裝部之一例。Unlike the first and second embodiments, the sprocket guard 410 is disposed between the sprocket 14 and the suspension portion 402. Therefore, it is disposed closer to the frame side than the sprocket 14. The sprocket guard 410 has a body portion 420 and a cushioning member 422 (refer to the eleventh and twelfth drawings). The main body portion 420 has a sprocket protecting portion 424 for protecting the sprocket 14 , a pair of first mounting portions 426 , and a second mounting portion 427 disposed between the pair of first mounting portions 426 . The first mounting portion 426 and the second mounting portion 427 are examples of mounting portions.
本體部420宜為鋁製。鏈輪保護部424係本體部420之外周緣部420a的一部分。鏈輪保護部424以位於比鏈輪14之鏈輪齒14a徑方向外方的方式，配置於本體部420徑方向外側之外周緣部420a。鏈輪保護部424在鏈輪14之周方向，以在一對第一安裝部426之間延伸的方式，概略彎曲成圓弧狀而形成。The body portion 420 is preferably made of aluminum. The sprocket guard 424 is a part of the outer peripheral portion 420a of the main body portion 420. The sprocket guard portion 424 is disposed outside the main body portion 420 in the radial direction outer peripheral portion 420a so as to be located outward in the radial direction of the sprocket teeth 14a of the sprocket 14. The sprocket guard portion 424 is formed by being roughly curved in an arc shape so as to extend between the pair of first attachment portions 426 in the circumferential direction of the sprocket 14 .
一對第一安裝部426具有裝設螺栓部件416之安裝孔426a。安裝孔426a配置於比曲柄組件12之一對鏈輪安裝孔12c徑方向外側。自行車行進方向後側之第一安裝部426配置於鏈條CN之下方。第一安裝孔426a如第十一圖所示，與第一種實施形態同樣地具有收納螺栓部件416之頭部416a的頭部收納部426b、螺栓部件416可貫穿之貫穿部426c、及裝設緩衝部件422之緩衝部件裝設部426d。在頭部收納部426b與頭部416a之間形成用於吸收撞擊之間隙。The pair of first mounting portions 426 have attachment holes 426a in which the bolt members 416 are attached. The mounting hole 426a is disposed outside the radial direction of the sprocket mounting hole 12c of one of the crank assemblies 12. The first mounting portion 426 on the rear side of the bicycle traveling direction is disposed below the chain CN. As shown in Fig. 11, the first attachment hole 426a has a head housing portion 426b that houses the head portion 416a of the bolt member 416, a penetration portion 426c through which the bolt member 416 can pass, and the mounting, as shown in the eleventh embodiment. The cushioning member mounting portion 426d of the cushioning member 422. A gap for absorbing an impact is formed between the head housing portion 426b and the head portion 416a.
第二安裝部427具有嵌合於貫穿孔404a之突起427a。在突起427a與貫穿孔404a之間形成用於吸收撞擊之間隙。緩衝 部件422在突起427a之周圍，裝設於設置在貫穿孔404a之環狀溝427b。The second attachment portion 427 has a projection 427a that is fitted into the through hole 404a. A gap for absorbing an impact is formed between the protrusion 427a and the through hole 404a. buffer The member 422 is attached to the annular groove 427b provided in the through hole 404a around the projection 427a.
如此構成之第三種實施形態的鏈輪防護罩410，由於與鏈輪14另外固定，因此，即使鏈輪安裝孔之間距等不同時，仍可安裝鏈輪防護罩。Since the sprocket guard 410 of the third embodiment configured as above is additionally fixed to the sprocket 14, the sprocket guard can be attached even when the distance between the sprocket mounting holes is different.
以上，係就本創作之一種實施形態作說明，不過本創作不限定於上述實施形態，在不脫離創作之要旨的範圍內可作各種變更。特別是本說明書中敘述之複數個實施形態及變形例，可依需要任意組合。The above description of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention. In particular, the plurality of embodiments and modifications described in the present specification can be arbitrarily combined as needed.
(a)前述第一及第二種實施形態，係在鏈輪之外側面，與鏈輪安裝孔相對而設至安裝部，不過本創作不限定於此。亦可在與鏈輪安裝孔不同之位置設置安裝部。(a) The first and second embodiments are provided on the outer side surface of the sprocket and are provided to the mounting portion so as to face the sprocket mounting hole. However, the present invention is not limited thereto. The mounting portion may also be provided at a position different from the sprocket mounting hole.
(b)前述第一種實施形態係以緩衝部件接觸於螺帽部件之方式配置，不過本創作不限定於此。緩衝部件只須與螺栓部件及螺帽部件中之至少一方接觸的方式來配置即可。因此，緩衝部件亦可配置成僅接觸於螺栓部件，或是與螺栓部件及螺帽部件兩方接觸。(b) The first embodiment described above is arranged such that the cushion member contacts the nut member, but the present invention is not limited thereto. The cushioning member may be disposed only in contact with at least one of the bolt member and the nut member. Therefore, the cushioning member may be configured to be in contact only with the bolt member or with both the bolt member and the nut member.
(c)前述3個實施形態，係在鏈輪及車架上安裝鏈輪防護罩，不過本創作不限定於此。例如亦可在曲柄支臂上安裝鏈輪防護罩。(c) In the above three embodiments, the sprocket guard is attached to the sprocket and the frame, but the present invention is not limited thereto. For example, a sprocket guard can also be attached to the crank arm.
(d)第一種實施形態為了提高撞擊之吸收作用，而設有錐形面28及緩衝部件22，不過本創作不限定於此。例如亦可僅設錐形面，而不設緩衝部件。此外，亦可僅設緩衝部件，而不設錐形面。(d) In the first embodiment, the tapered surface 28 and the cushioning member 22 are provided in order to enhance the absorption of the impact, but the present invention is not limited thereto. For example, it is also possible to provide only a tapered surface without a cushioning member. In addition, it is also possible to provide only a cushioning member without a tapered surface.
10,110, 210,410‧‧‧鏈輪防護罩10,110, 210,410‧‧‧Sprocket cover
12‧‧‧曲柄組件12‧‧‧ crank assembly
12a‧‧‧曲柄支臂12a‧‧‧Crank arm
12b‧‧‧鏈輪安裝支臂12b‧‧‧Sprocket mounting arm
12c‧‧‧鏈輪安裝孔12c‧‧‧Sprocket mounting holes
14‧‧‧鏈輪14‧‧‧Sprocket
14a‧‧‧鏈輪齒14a‧‧‧Sprocket teeth
14b‧‧‧貫穿孔14b‧‧‧through holes
16‧‧‧螺栓部件16‧‧‧Bolt parts
16a‧‧‧頭部16a‧‧‧ head
16b‧‧‧工具卡扣部16b‧‧‧Tools buckle
18‧‧‧螺帽部件18‧‧‧ Nut parts
18a‧‧‧頭部18a‧‧‧ head
18b‧‧‧工具卡扣部18b‧‧‧Tools snap
20,120,220,320,420‧‧‧本體部20,120,220,320,420‧‧‧ Body Department
20a,220a,320a,420a‧‧‧外周緣部20a, 220a, 320a, 420a‧‧‧ outer peripheral part
20b‧‧‧前端緣部20b‧‧‧ front edge
20c‧‧‧基端緣部20c‧‧‧ basal edge
20d‧‧‧內側緣部20d‧‧‧inside edge
22,222,322,422‧‧‧緩衝部件22,222,322,422‧‧‧buffer parts
22a‧‧‧內周面22a‧‧‧ inner circumference
22b‧‧‧外周面22b‧‧‧ outer perimeter
22c‧‧‧前端面22c‧‧‧ front end
22d‧‧‧基端面22d‧‧‧ base end face
24‧‧‧鏈輪保護部24‧‧‧Sprocket Protection Department
26,126‧‧‧安裝部26,126‧‧‧Installation Department
26a,426a‧‧‧安裝孔26a, 426a‧‧‧ mounting holes
26b‧‧‧頭部收納部26b‧‧‧Head storage unit
26c‧‧‧貫穿部26c‧‧‧through section
26d‧‧‧緩衝部件裝設部26d‧‧‧Buffering Parts Installation Department
28‧‧‧錐形面28‧‧‧Conical surface
28a‧‧‧第一錐形面28a‧‧‧First tapered surface
28b‧‧‧第二錐形面28b‧‧‧Second tapered surface
28c‧‧‧薄部28c‧‧‧
126a‧‧‧縫隙126a‧‧‧ gap
226‧‧‧安裝部226‧‧‧Installation Department
226a‧‧‧安裝孔226a‧‧‧Mounting holes
320e‧‧‧縫隙320e‧‧‧ gap
404‧‧‧固定托架404‧‧‧Fixed bracket
404a‧‧‧貫穿孔404a‧‧‧through hole
416‧‧‧螺栓部件416‧‧‧Bolt parts
426‧‧‧第一安裝部426‧‧‧First Installation Department
426a‧‧‧安裝孔426a‧‧‧Mounting holes
426b‧‧‧頭部收納部426b‧‧‧Head storage unit
426c‧‧‧貫穿部426c‧‧‧ penetration
426d‧‧‧緩衝部件裝設部426d‧‧‧Buffering Parts Installation Department
427‧‧‧第二安裝部427‧‧‧Second Installation Department
427a‧‧‧突起427a‧‧‧ Protrusion
427b‧‧‧環狀溝427b‧‧‧ annular groove
R、C‧‧‧倒角R, C‧‧‧Chamfering
α‧‧‧錐角‧‧‧‧ cone angle
CN‧‧‧鏈條CN‧‧‧Chain
424‧‧‧鏈輪保護部424‧‧‧Sprocket Protection Department
402‧‧‧懸吊部402‧‧‧suspension
第一圖係顯示將本創作第一種實施形態的用於自行車之鏈輪防護罩裝設於鏈輪上之狀態的前視圖。The first figure shows a front view of a state in which the bicycle sprocket guard of the first embodiment of the present invention is mounted on a sprocket.
第二圖係第一圖之切斷線II-II的剖面放大圖。The second drawing is an enlarged cross-sectional view of the cutting line II-II of the first figure.
第三圖係第一種實施形態的用於自行車之鏈輪防護罩的前視圖。The third figure is a front view of a bicycle sprocket guard of the first embodiment.
第四圖係第三圖之切斷面IV-IV的剖面放大圖。The fourth drawing is an enlarged cross-sectional view of the cut surface IV-IV of the third drawing.
第五圖係緩衝部件之斜視圖。The fifth figure is a perspective view of the cushioning member.
第六圖係緩衝部件之剖面放大圖。The sixth figure is an enlarged cross-sectional view of the cushioning member.
第七圖係第一種實施形態之變形例的相當於第三圖之圖。The seventh drawing is a view corresponding to the third figure in a modification of the first embodiment.
第八圖係第二種實施形態之相當於第三圖之圖。The eighth figure is a diagram equivalent to the third figure of the second embodiment.
第九圖係第二種實施形態之變形例的相當於第三圖之圖。The ninth drawing is a view corresponding to the third figure in a modification of the second embodiment.
第十圖係顯示將第三種實施形態的用於自行車之鏈輪防護罩裝設於車架上的狀態之前視圖。Fig. 10 is a front view showing a state in which the bicycle sprocket guard of the third embodiment is mounted on the frame.
第十一圖係第十圖之切斷線XI-XI的剖面圖。The eleventh drawing is a sectional view of the cutting line XI-XI of the tenth drawing.
第十二圖係第十圖之切斷線XII-XII的剖面圖。Figure 12 is a cross-sectional view of the cutting line XII-XII of the tenth figure.
10‧‧‧鏈輪防護罩10‧‧‧Sprocket cover
12b‧‧‧鏈輪安裝支臂12b‧‧‧Sprocket mounting arm
12c‧‧‧鏈輪安裝孔12c‧‧‧Sprocket mounting holes
14‧‧‧鏈輪14‧‧‧Sprocket
14a‧‧‧鏈輪齒14a‧‧‧Sprocket teeth
14b‧‧‧貫穿孔14b‧‧‧through holes
16‧‧‧螺栓部件16‧‧‧Bolt parts
16a‧‧‧頭部16a‧‧‧ head
16b‧‧‧工具卡扣部16b‧‧‧Tools buckle
18‧‧‧螺帽部件18‧‧‧ Nut parts
18a‧‧‧頭部18a‧‧‧ head
18b‧‧‧工具卡扣部18b‧‧‧Tools snap
20‧‧‧本體部20‧‧‧ Body Department
20a‧‧‧外周緣部20a‧‧‧The outer periphery
22‧‧‧緩衝部件22‧‧‧buffer parts
24‧‧‧鏈輪保護部24‧‧‧Sprocket Protection Department
26‧‧‧安裝部26‧‧‧Installation Department
26a‧‧‧安裝孔26a‧‧‧Mounting holes
26b‧‧‧頭部收納部26b‧‧‧Head storage unit
26c‧‧‧貫穿部26c‧‧‧through section
26d‧‧‧緩衝部件裝設部26d‧‧‧Buffering Parts Installation Department
Claims (18)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101217078U TWM452902U (en) | 2012-09-05 | 2012-09-05 | Protective shield of bicycle sprocket |
| DE201320103872 DE202013103872U1 (en) | 2012-09-05 | 2013-08-27 | Bicycle sprocket guard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101217078U TWM452902U (en) | 2012-09-05 | 2012-09-05 | Protective shield of bicycle sprocket |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| TWM452902U true TWM452902U (en) | 2013-05-11 |
Family
ID=49079325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW101217078U TWM452902U (en) | 2012-09-05 | 2012-09-05 | Protective shield of bicycle sprocket |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE202013103872U1 (en) |
| TW (1) | TWM452902U (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10618588B2 (en) * | 2017-12-13 | 2020-04-14 | Gates Corporation | Sprocket guard |
| EP3647170B1 (en) * | 2018-10-29 | 2024-07-31 | Miranda & Irmão Lda. | Crank set with chain guard ring and fastening element |
| US20220227442A1 (en) * | 2021-01-15 | 2022-07-21 | Sram, Llc | Bash guard device and system for bicycle components |
-
2012
- 2012-09-05 TW TW101217078U patent/TWM452902U/en not_active IP Right Cessation
-
2013
- 2013-08-27 DE DE201320103872 patent/DE202013103872U1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE202013103872U1 (en) | 2013-09-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4K | Annulment or lapse of a utility model due to non-payment of fees |