TWI722005B - Bicycle sprocket and sprocket assembly - Google Patents

Abstract

本發明之目的在於提供一種鏈條之保持力高且生產性優異之自行車用鏈輪。 The object of the present invention is to provide a bicycle sprocket with high chain retention and excellent productivity.

本自行車用鏈輪14包含旋轉中心軸心X。本鏈輪14具備：第1齒32a、與第2齒32b。第1齒32a具有第1軸方向鏈條扣合寬度。第1軸方向鏈條扣合寬度W1小於外鏈之第1軸方向間隔L1。又，第1軸方向鏈條扣合寬度W1大於連結於外鏈板2a之內鏈板2b之第2軸方向間隔L2。第2齒32b具有第2軸方向鏈條扣合寬度W4。第2軸方向鏈條扣合寬度W4小於第2軸方向間隔L2。第2齒32b係藉由材料之變形而形成。 The bicycle sprocket 14 includes a rotation center axis X. The sprocket 14 includes a first tooth 32a and a second tooth 32b. The first tooth 32a has a chain engagement width in the first axis direction. The first-axis direction chain engagement width W1 is smaller than the first-axis direction interval L1 of the outer chain. In addition, the first-axis-direction chain engagement width W1 is larger than the second-axis-direction interval L2 of the inner link plate 2b connected to the outer link plate 2a. The second tooth 32b has a second chain engagement width W4 in the axial direction. The chain engagement width W4 in the second axis direction is smaller than the interval L2 in the second axis direction. The second tooth 32b is formed by deformation of the material.

Description

自行車用鏈輪及鏈輪總成 Bicycle sprocket and sprocket assembly

本發明係關於一種自行車用鏈輪、及自行車用鏈輪總成。 The invention relates to a bicycle sprocket and a bicycle sprocket assembly.

先前之自行車用鏈輪分別設置於曲柄總成及後輪。於曲柄總成之鏈輪、與後輪之鏈輪，嚙合架設有鏈條。藉此，曲柄總成之旋轉經由鏈條傳遞至後輪。 The previous bicycle sprockets are respectively arranged on the crank assembly and the rear wheel. The sprocket of the crank assembly and the sprocket of the rear wheel mesh with a chain. Thereby, the rotation of the crank assembly is transmitted to the rear wheel via the chain.

鏈條係內鏈板與外鏈板彼此連結。又，對向之一對內鏈板間之間隔小於對向之一對外鏈板間之間隔而形成。因此，若以鏈輪之齒厚(扣合寬度)全部相同之方式形成鏈輪之齒，則於鏈輪之厚度方向上，外鏈板與鏈輪之齒之間之間隙大於內鏈板與鏈輪之齒之間的間隙。 The inner chain plate and the outer chain plate of the chain system are connected to each other. In addition, the interval between one pair of opposite inner link plates is smaller than the interval between one opposite pair of outer link plates. Therefore, if the teeth of the sprocket are formed in such a way that the tooth thickness (fastening width) of the sprocket is all the same, in the thickness direction of the sprocket, the gap between the outer chain plate and the teeth of the sprocket is greater than The gap between the teeth of the sprocket.

於此種先前之構造中，因鏈輪厚度方向上之外鏈板與鏈輪之齒之間之間隙，導致有鏈條與鏈輪之扣合變緩之傾向。因此，提出一種以嚙合於外鏈板之齒之厚度大於嚙合於內鏈板之齒的厚度之方式形成之鏈輪(參照專利文獻1)。 In this previous structure, due to the gap between the outer chain plate and the teeth of the sprocket in the thickness direction of the sprocket, the engagement of the chain and the sprocket tends to be slowed down. Therefore, a sprocket formed such that the thickness of the teeth meshing with the outer link plate is greater than the thickness of the teeth meshing with the inner link plate is proposed (refer to Patent Document 1).

[先前技術文獻] [Prior Technical Literature] [專利文獻] [Patent Literature]

[專利文獻1]US2013/0139642號公報 [Patent Document 1] US2013/0139642 Publication

於先前之鏈輪中，藉由切削加工嚙合於內鏈板之齒，使嚙合於外鏈板之齒之厚度大於嚙合於內鏈板之齒之厚度(例如，參照 US2013/0139642號公報之段落0045)。 In the previous sprocket, by cutting the teeth meshing with the inner link plate, the thickness of the teeth meshing with the outer link plate is greater than the thickness of the teeth meshing with the inner link plate (for example, refer to Paragraph 0045 of US2013/0139642 Bulletin).

於該情形時，為了形成鏈輪，有切削加工時加工時間延長之問題。即，於生產上述鏈輪時，難以提高鏈輪之生產性。 In this case, in order to form the sprocket, there is a problem that the machining time during cutting is prolonged. That is, it is difficult to improve the productivity of the sprocket when producing the above-mentioned sprocket.

本發明係鑒於上述問題而完成者，本發明之目的在於：提供一種鏈條之保持力較高且生產性優異之自行車用鏈輪。又，提供一種鏈條之保持力較高且生產性優異之自行車用鏈輪總成。 The present invention was made in view of the above-mentioned problems. The object of the present invention is to provide a bicycle sprocket with high chain retention and excellent productivity. In addition, a bicycle sprocket assembly with high chain retention and excellent productivity is provided.

(1)本發明一態樣之自行車用鏈輪具有旋轉中心軸心。本自行車用鏈輪具備第1齒、與第2齒。第1齒具有第1軸方向鏈條扣合寬度。第1軸方向鏈條扣合寬度小於自行車用鏈條外鏈之第1軸方向間隔。又，第1軸方向鏈條扣合寬度大於連結於外鏈之內鏈之第2軸方向間隔。第2齒具有第2軸方向鏈條扣合寬度。第2軸方向鏈條扣合寬度小於第2軸方向間隔。第2齒係藉由材料之變形而形成。 (1) A bicycle sprocket according to one aspect of the present invention has a rotation center axis. The bicycle sprocket includes a first tooth and a second tooth. The first tooth has a chain engagement width in the first axis direction. The engagement width of the chain in the first axis direction is smaller than the interval in the first axis direction of the outer chain of the bicycle chain. In addition, the engagement width of the chain in the first axis direction is greater than the interval in the second axis direction of the inner chain connected to the outer chain. The second tooth has a chain engagement width in the second axis direction. The chain engagement width in the second axis direction is smaller than the interval in the second axis direction. The second tooth system is formed by deformation of the material.

於本鏈輪中，第1齒之第1軸方向鏈條扣合寬度小於外鏈之第1軸方向間隔，且大於內鏈之第2軸方向間隔。又，第2齒之第2軸方向鏈條扣合寬度小於第2軸方向間隔。藉此，藉由鏈輪可確實地保持鏈條。又，由於第2齒係藉由材料之變形而形成，故與先前技術相比，可提高鏈輪之生產性。 In this sprocket, the chain engagement width of the first tooth in the first axis direction is smaller than the first axis interval of the outer chain and greater than the second axis interval of the inner chain. In addition, the chain engagement width of the second tooth in the second axis direction is smaller than the interval in the second axis direction. Thereby, the chain can be surely held by the sprocket. In addition, since the second tooth system is formed by the deformation of the material, the productivity of the sprocket can be improved compared with the prior art.

(2)本發明另一態樣之自行車用鏈輪可如下構成。第2齒係藉由衝壓加工形成。 (2) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. The second tooth system is formed by pressing.

於該情形時，由於藉由衝壓加工形成第2齒，故可確實地提高鏈輪之生產性。 In this case, since the second teeth are formed by pressing, the productivity of the sprocket can be reliably improved.

(3)本發明另一態樣之自行車用鏈輪可如下構成。第1齒具有凹部。凹部為用以避免與內鏈之過度干涉者，且藉由衝壓加工形成。 (3) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. The first tooth has a concave portion. The recess is used to avoid excessive interference with the inner chain, and is formed by stamping.

於該情形時，即使將第1齒配置於外鏈之間，亦可藉由凹部避免與內鏈之過度干涉。又，由於藉由衝壓加工形成凹部，故可提高凹部 之生產性。 In this case, even if the first tooth is arranged between the outer chain, excessive interference with the inner chain can be avoided by the recess. In addition, since the recesses are formed by press processing, the recesses can be improved The productivity.

(4)本發明另一態樣之自行車用鏈輪可為如下構成者。第1齒具有凹部。凹部為用以避免與內鏈之過度干涉者，且藉由切削加工形成。 (4) The bicycle sprocket according to another aspect of the present invention may be constructed as follows. The first tooth has a concave portion. The recess is used to avoid excessive interference with the inner chain, and is formed by cutting.

於該情形時，即使將第1齒配置於外鏈之間，亦可藉由凹部避免與內鏈之過度干涉。又，由於藉由切削加工形成凹部，故可正確地形成凹部。 In this case, even if the first tooth is arranged between the outer chain, excessive interference with the inner chain can be avoided by the recess. In addition, since the recesses are formed by cutting, the recesses can be accurately formed.

(5)本發明另一態樣之自行車用鏈輪可如下形成。第1齒具有本體部與追加部。追加部係為了擴寬本體部之寬度而安裝於本體部。第1軸方向鏈條扣合寬度為藉由將追加部安裝於本體部而獲得之寬度。 (5) The bicycle sprocket according to another aspect of the present invention can be formed as follows. The first tooth has a main body part and an additional part. The additional part is installed on the main body in order to widen the width of the main body. The chain engagement width in the first axis direction is the width obtained by attaching the additional part to the main body part.

於該情形時，由於第1齒係藉由將追加部安裝於本體部，而使第1軸方向鏈條扣合寬度大於第2軸方向間隔，故可自由地選擇追加部之材料。 In this case, since the additional part is attached to the main body of the first tooth system, the engagement width of the chain in the first axis direction is greater than the interval in the second axis direction, so that the material of the additional part can be freely selected.

(6)本發明另一態樣之自行車用鏈輪可如下構成。第1齒之追加部為金屬製。該追加部係藉由接著、擴散接合、鉚合、或鑄造安裝於第1齒。 (6) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. The additional part of the first tooth is made of metal. The additional part is attached to the first tooth by bonding, diffusion bonding, riveting, or casting.

於該情形時，由於第1齒之追加部為金屬製，故可充分地確保追加部之強度及剛性。又，該追加部係藉由接著、擴散接合、鉚合、或鑄造可確實地安裝於第1齒。 In this case, since the additional part of the first tooth is made of metal, the strength and rigidity of the additional part can be sufficiently ensured. In addition, the additional part can be reliably attached to the first tooth by bonding, diffusion bonding, caulking, or casting.

(7)本發明另一態樣之自行車用鏈輪可如下構成。第1齒之追加部為非金屬製。該追加部係藉由接著或一體成型而安裝於第1齒。 (7) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. The additional part of the first tooth is made of non-metal. The additional part is attached to the first tooth by bonding or integral molding.

於該情形時，由於第1齒之追加部為非金屬製，故可謀求追加部成型之容易化及輕量化。又，該追加部係藉由接著或一體成型可確實地安裝於第1齒。 In this case, since the additional part of the first tooth is made of non-metal, it is possible to facilitate the molding of the additional part and reduce the weight. In addition, the additional part can be reliably attached to the first tooth by bonding or integral molding.

(8)本發明另一態樣之自行車用鏈輪可如下構成。第1齒及第2齒各者均具有驅動面。驅動面包含鏈條輥接觸之接觸點。於驅動面，形成驅動面延伸部。驅動面延伸部較接觸點於徑向外側、於周方向延 伸。 (8) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. Each of the first tooth and the second tooth has a driving surface. The driving surface includes the contact point where the chain roller contacts. On the driving surface, an extension of the driving surface is formed. The extension of the driving surface extends radially outward and in the circumferential direction from the contact point. stretch.

於該情形時，於第1齒及第2齒各者中，驅動面之驅動面延伸部較驅動面之接觸點於徑向外部、於周方向延伸。因此，可確實地抑制鏈輪之鏈條向徑向外側之移動。 In this case, in each of the first tooth and the second tooth, the driving surface extension portion of the driving surface extends radially outward and in the circumferential direction than the contact point of the driving surface. Therefore, the radially outward movement of the chain of the sprocket can be reliably suppressed.

(9)本發明另一態樣之自行車用鏈輪可如下構成。第1齒及第2齒各者均具有非驅動面。於非驅動面，形成非驅動面延伸部。非驅動面延伸部係為了抑制鏈條輥向徑向外側之移動而於周方向延伸。 (9) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. Each of the first tooth and the second tooth has a non-driving surface. On the non-driving surface, a non-driving surface extension is formed. The non-driving surface extension portion extends in the circumferential direction in order to suppress the radially outward movement of the chain roller.

於該情形時，藉由第1齒及第2齒各者之非驅動面之非驅動面延伸部，可確實地抑制鏈條向徑向外側之移動。 In this case, the non-driving surface extension portion of the non-driving surface of each of the first tooth and the second tooth can reliably restrain the chain from moving radially outward.

(10)本發明另一態樣之自行車用鏈輪可如下構成。第1齒及第2齒各者均具有驅動面、與非驅動面。驅動面包含鏈條輥接觸之接觸點。於驅動面，形成驅動面延伸部。驅動面延伸部較接觸點於徑向外側、於周方向延伸。又，於非驅動面，形成非驅動面延伸部。非驅動面延伸部係為了抑制鏈條輥向徑向外側之移動而於周方向延伸。 (10) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. Each of the first tooth and the second tooth has a driving surface and a non-driving surface. The driving surface includes the contact point where the chain roller contacts. On the driving surface, an extension of the driving surface is formed. The driving surface extension portion extends radially outward and in the circumferential direction from the contact point. In addition, a non-driving surface extension is formed on the non-driving surface. The non-driving surface extension portion extends in the circumferential direction in order to suppress the radially outward movement of the chain roller.

於該情形時，於第1齒及第2齒中，驅動面之驅動面延伸部較驅動面之接觸點於徑向外側、於周方向延伸。因此，藉由第1齒及第2齒各者之非驅動面之非驅動面延伸部，可確實地抑制鏈條輥向徑向外側之移動。 In this case, in the first tooth and the second tooth, the driving surface extension portion of the driving surface extends radially outward and in the circumferential direction than the contact point of the driving surface. Therefore, the non-driving surface extension portion of the non-driving surface of each of the first tooth and the second tooth can reliably suppress the radially outward movement of the chain roller.

(11)本發明另一態樣之自行車用鏈輪可如下構成。本自行車用鏈輪進而具備用以於變速時使鏈條變速之變速區域。 (11) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. The bicycle sprocket is further provided with a shifting area for shifting the chain during shifting.

於該情形時，可提供鏈條保持力優異之能夠變速之自行車用鏈輪。 In this case, it is possible to provide a bicycle sprocket capable of shifting gears with excellent chain retention.

(12)本發明另一態樣之自行車用鏈輪可如下構成。本自行車用鏈輪進而具備：金屬製之環狀部、與非金屬製之本體部。於金屬製之環狀部，於外周設置第1齒及第2齒。非金屬製之本體部安裝於金屬製之環狀部之徑向內周。 (12) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. The bicycle sprocket is further provided with a metal ring part and a non-metal body part. The metal ring part is provided with the first tooth and the second tooth on the outer periphery. The non-metal body part is installed on the radial inner circumference of the metal ring part.

於該情形時，由於鏈輪之本體部為非金屬製，故可謀求鏈輪之輕量化。又，由於鏈輪之環狀部及第1齒及第2齒為金屬製，故可提高鏈輪與鏈條扣合之部分之強度及剛性。 In this case, since the body of the sprocket is made of non-metal, the weight of the sprocket can be reduced. In addition, since the ring portion and the first and second teeth of the sprocket are made of metal, the strength and rigidity of the part where the sprocket and the chain engage can be improved.

(13)本發明另一態樣之自行車用鏈輪可如下構成。於本自行車用鏈輪中，上述衝壓加工為鍛造。 (13) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. In the bicycle sprocket, the above-mentioned press processing is forging.

於該情形時，由於上述衝壓加工為鍛造，故可確實且容易地提高鏈輪之生產性。 In this case, since the above-mentioned press processing is forging, the productivity of the sprocket can be reliably and easily improved.

(14)本發明另一態樣之自行車用鏈輪可如下構成。第2齒係藉由衝壓加工及切削步驟形成。如此形成第2齒，亦可提高鏈輪之生產性。 (14) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. The second tooth system is formed by pressing and cutting steps. By forming the second tooth in this way, the productivity of the sprocket can also be improved.

(15)本發明另一態樣之自行車用鏈輪可如下構成。第2齒係藉由第1衝壓步驟、第1衝壓步驟後之切削步驟、及切削步驟後之第2衝壓步驟形成。如此階段性形成第2齒，亦可提高鏈輪之生產性。 (15) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. The second tooth system is formed by the first punching step, the cutting step after the first punching step, and the second punching step after the cutting step. By forming the second tooth in such a stage, the productivity of the sprocket can also be improved.

(16)本發明另一態樣之自行車用鏈輪可如下構成。第2齒具有第1面、與在與旋轉中心軸心平行之軸方向上位於第1面相反側之第2面。第1衝壓步驟為衝壓第2齒之第1面側之步驟。第2衝壓步驟為衝壓第2齒之上述第2面側之步驟。藉由如此形成第2齒，可容易地形成第2齒之兩面(第1面及第2面)。即，可提高鏈輪之生產性。 (16) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. The second tooth has a first surface and a second surface located on the opposite side of the first surface in the axial direction parallel to the rotation center axis. The first punching step is a step of punching the first surface side of the second tooth. The second pressing step is a step of pressing the above-mentioned second surface side of the second tooth. By forming the second tooth in this way, both surfaces (the first surface and the second surface) of the second tooth can be easily formed. That is, the productivity of the sprocket can be improved.

(17)本發明另一態樣之自行車用鏈輪可如下構成。切削步驟為切削第2齒之第2面側之藉由第1衝壓步驟於軸方向突出之突出部之步驟。藉由如此形成第2齒，可於第2衝壓步驟中將第2齒之第2面容易地形成為形狀。即，可提高鏈輪之生產性。 (17) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. The cutting step is a step of cutting the protrusion on the second surface side of the second tooth that protrudes in the axial direction by the first punching step. By forming the second tooth in this way, the second surface of the second tooth can be easily formed into a shape in the second pressing step. That is, the productivity of the sprocket can be improved.

(18)本發明一態樣之自行車用鏈輪具有旋轉中心軸心。本自行車用鏈輪具備第1齒、與第2齒。第1齒具有第1軸方向鏈條扣合寬度。第1軸方向鏈條扣合寬度小於自行車用鏈條外鏈之第1軸方向間隔。又，第1軸方向鏈條扣合寬度大於連結於外鏈之內鏈之第2軸方向間隔。第 2齒具有第2軸方向鏈條扣合寬度。第2軸方向鏈條扣合寬度小於第2軸方向間隔。自徑向外側觀察時，第1齒實質上具有八角形狀。 (18) A bicycle sprocket according to one aspect of the present invention has a rotation center axis. The bicycle sprocket includes a first tooth and a second tooth. The first tooth has a chain engagement width in the first axis direction. The engagement width of the chain in the first axis direction is smaller than the interval in the first axis direction of the outer chain of the bicycle chain. In addition, the engagement width of the chain in the first axis direction is greater than the interval in the second axis direction of the inner chain connected to the outer chain. First The 2 teeth have a chain engagement width in the second axis direction. The chain engagement width in the second axis direction is smaller than the interval in the second axis direction. When viewed from the outside in the radial direction, the first tooth has a substantially octagonal shape.

於本鏈輪中，第1齒之第1軸方向鏈條扣合寬度小於外鏈之第1軸方向間隔，大於內鏈之第2軸方向間隔。又，第2齒之第2軸方向鏈條扣合寬度小於第2軸方向間隔。藉此，藉由鏈輪可確實地保持鏈條。 In this sprocket, the chain engagement width of the first tooth in the first axis direction is smaller than the first axis interval of the outer chain, and greater than the second axis interval of the inner chain. In addition, the chain engagement width of the second tooth in the second axis direction is smaller than the interval in the second axis direction. Thereby, the chain can be surely held by the sprocket.

又，由於自徑向外側觀察時第1齒實質上具有八角形狀，故可避免第1齒與內鏈板之過度干涉，且藉由衝壓加工例如鍛造可容易地形成確實地保持外鏈板之齒形狀。 In addition, since the first tooth substantially has an octagonal shape when viewed from the outside in the radial direction, excessive interference between the first tooth and the inner link plate can be avoided, and it can be easily formed to reliably hold the outer link plate by press working such as forging Tooth shape.

(19)本發明一態樣之自行車用鏈輪具有旋轉中心軸心。本自行車用鏈輪具備第1齒、與第2齒。第1齒具有第1軸方向鏈條扣合寬度。第1軸方向鏈條扣合寬度小於自行車用鏈條外鏈之第1軸方向間隔。又，第1軸方向鏈條扣合寬度大於連結於外鏈之內鏈之第2軸方向間隔。第2齒具有第2軸方向鏈條扣合寬度。第2軸方向鏈條扣合寬度小於第2軸方向間隔。第1齒具有用以避免與內鏈過度干涉之傾斜部。 (19) A bicycle sprocket according to one aspect of the present invention has a rotation center axis. The bicycle sprocket includes a first tooth and a second tooth. The first tooth has a chain engagement width in the first axis direction. The engagement width of the chain in the first axis direction is smaller than the interval in the first axis direction of the outer chain of the bicycle chain. In addition, the engagement width of the chain in the first axis direction is greater than the interval in the second axis direction of the inner chain connected to the outer chain. The second tooth has a chain engagement width in the second axis direction. The chain engagement width in the second axis direction is smaller than the interval in the second axis direction. The first tooth has an inclined part to avoid excessive interference with the inner chain.

於本鏈輪中，第1齒之第1軸方向鏈條扣合寬度小於外鏈之第1軸方向間隔，大於內鏈之第2軸方向間隔。又，第2齒之第2軸方向鏈條扣合寬度小於第2軸方向間隔。藉此，藉由鏈輪可確實地保持鏈條。 In this sprocket, the chain engagement width of the first tooth in the first axis direction is smaller than the first axis interval of the outer chain, and greater than the second axis interval of the inner chain. In addition, the chain engagement width of the second tooth in the second axis direction is smaller than the interval in the second axis direction. Thereby, the chain can be surely held by the sprocket.

又，由於第1齒具有傾斜部，故即使將第1齒配置於外鏈之間，亦可藉由傾斜部避免與內鏈之過度干涉，且藉由衝壓加工例如鍛造容易地形成確實地保持外鏈板之齒形狀。 In addition, since the first tooth has an inclined portion, even if the first tooth is arranged between the outer chain, excessive interference with the inner chain can be avoided by the inclined portion, and it can be easily formed and held securely by press working such as forging. The tooth shape of the outer chain plate.

(20)本發明另一態樣之自行車用鏈輪可如下構成。第1齒進而具有第1面、第2面、及第3面。第3面在第1面及上述第2面之軸方向間於周方向延伸。傾斜部具有第1倒角面、第2倒角面、第3倒角面、及第4倒角面。 (20) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. The first tooth further has a first surface, a second surface, and a third surface. The third surface extends in the circumferential direction between the axial directions of the first surface and the second surface. The inclined portion has a first chamfered surface, a second chamfered surface, a third chamfered surface, and a fourth chamfered surface.

第1倒角面自第1面形成至驅動側之第3面。第2倒角面自第2面形成至驅動側之第3面。第3倒角面自第1面形成至非驅動側之第3面。第 4倒角面自第2面形成至非驅動側之第3面。 The first chamfered surface is formed from the first surface to the third surface on the drive side. The second chamfered surface is formed from the second surface to the third surface on the driving side. The third chamfered surface is formed from the first surface to the third surface on the non-driving side. First The chamfered surface is formed from the second surface to the third surface on the non-driving side.

於該情形時，藉由第1至第4倒角面，可避免第1齒與內鏈板之過度干涉，且藉由衝壓加工例如鍛造可容易地形成確實地保持外鏈板之齒形狀。 In this case, by the first to fourth chamfered surfaces, excessive interference between the first tooth and the inner link plate can be avoided, and the tooth shape of the outer link plate can be easily formed by pressing, such as forging.

(21)本發明另一態樣之自行車用鏈輪可如下構成。第1齒之驅動面接觸於鏈條輥之第1軸方向接觸寬度與第2齒之驅動面接觸於鏈條輥之第2軸方向接觸寬度實質上形成為相同之長度。 (21) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. The contact width in the first axis direction of the driving surface of the first tooth in contact with the chain roller and the contact width in the second axis direction of the driving surface of the second tooth in contact with the chain roller are substantially the same length.

於該情形時，由於第1軸方向接觸寬度及第2軸方向接觸寬度實質上為相同之長度，故將可驅動力自鏈輪穩定地傳遞至鏈條。 In this case, since the contact width in the first axis direction and the contact width in the second axis direction are substantially the same length, the drivable force is stably transmitted from the sprocket to the chain.

(22)本發明另一態樣之自行車用鏈輪具有旋轉中心軸心。本自行車用鏈輪具備第1齒、與第2齒。第1齒具有第1軸方向鏈條扣合寬度。第1軸方向鏈條扣合寬度小於自行車用鏈條外鏈之第1軸方向間隔。又，第1軸方向鏈條扣合寬度大於連結於外鏈之內鏈之第2軸方向間隔。第2齒具有第2軸方向鏈條扣合寬度。第2軸方向鏈條扣合寬度小於第2軸方向間隔。第1齒及第2齒中之至少一者具有鍍敷層。 (22) A bicycle sprocket according to another aspect of the present invention has a rotation center axis. The bicycle sprocket includes a first tooth and a second tooth. The first tooth has a chain engagement width in the first axis direction. The engagement width of the chain in the first axis direction is smaller than the interval in the first axis direction of the outer chain of the bicycle chain. In addition, the engagement width of the chain in the first axis direction is greater than the interval in the second axis direction of the inner chain connected to the outer chain. The second tooth has a chain engagement width in the second axis direction. The chain engagement width in the second axis direction is smaller than the interval in the second axis direction. At least one of the first tooth and the second tooth has a plating layer.

於本鏈輪中，第1齒之第1軸方向鏈條扣合寬度小於外鏈之第1軸方向間隔，大於內鏈之第2軸方向間隔。又，第2齒之第2軸方向鏈條扣合寬度小於第2軸方向間隔。藉此，藉由鏈輪可確實地保持鏈條。 In this sprocket, the chain engagement width of the first tooth in the first axis direction is smaller than the first axis interval of the outer chain, and greater than the second axis interval of the inner chain. In addition, the chain engagement width of the second tooth in the second axis direction is smaller than the interval in the second axis direction. Thereby, the chain can be surely held by the sprocket.

又，由於第1齒及第2齒中之至少一者具有鍍敷層，故可提高第1齒及第2齒中之至少一者之耐摩耗性及防鏽性。 In addition, since at least one of the first tooth and the second tooth has a plating layer, the abrasion resistance and rust resistance of at least one of the first tooth and the second tooth can be improved.

(23)本發明另一態樣之自行車用鏈輪可如下構成。第1齒及第2齒為鋁製。鍍敷層為鍍鎳層。於該情形時，可提高第1齒及第2齒之耐磨耗性。 (23) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. The first tooth and the second tooth are made of aluminum. The plating layer is a nickel plating layer. In this case, the wear resistance of the first tooth and the second tooth can be improved.

(24)本發明另一態樣之自行車用鏈輪可如下構成。第1齒及第2齒為鐵製。鍍敷層為鍍鎳鉻層。於該情形時，可提高第1齒及第2齒之防鏽性。 (24) The bicycle sprocket according to another aspect of the present invention can be constructed as follows. The first tooth and the second tooth are made of iron. The plating layer is a nickel-chromium plating layer. In this case, the rust resistance of the first tooth and the second tooth can be improved.

(25)本發明另一態樣之自行車用鏈輪總成具備上述(1)至(24)中任一項記載之鏈輪。 (25) A bicycle sprocket assembly according to another aspect of the present invention includes the sprocket described in any one of (1) to (24) above.

本鏈輪總成可獲得與上述(1)至(24)所記載之效果相同之效果。 This sprocket assembly can obtain the same effects as those described in (1) to (24) above.

(26)本發明另一態樣之自行車用鏈輪總成可如下構成。於本鏈輪總成中，鏈輪為1個前鏈輪。 (26) The bicycle sprocket assembly according to another aspect of the present invention can be constructed as follows. In this sprocket assembly, the sprocket is a front sprocket.

如此構成鏈輪總成，亦可獲得與上述(1)至(24)所記載之效果相同之效果。 By configuring the sprocket assembly in this way, the same effects as those described in (1) to (24) above can also be obtained.

(27)本發明另一態樣之自行車用鏈輪總成可如下構成。於本鏈輪總成中，鏈輪為複數個前鏈輪。 (27) The bicycle sprocket assembly of another aspect of the present invention can be constructed as follows. In this sprocket assembly, the sprocket is a plurality of front sprocket.

如此構成鏈輪總成，亦可獲得與上述(1)至(24)所記載之效果相同之效果。 By configuring the sprocket assembly in this way, the same effects as those described in (1) to (24) above can also be obtained.

(28)本發明另一態樣之自行車用鏈輪總成可如下構成。於本鏈輪總成中，鏈輪可沿著旋轉中心軸心移動。 (28) The bicycle sprocket assembly of another aspect of the present invention can be constructed as follows. In this sprocket assembly, the sprocket can move along the central axis of rotation.

如此構成鏈輪總成，亦可獲得與上述(1)至(24)所記載之效果相同之效果。 By configuring the sprocket assembly in this way, the same effects as those described in (1) to (24) above can also be obtained.

(29)本發明另一態樣之自行車用鏈輪總成可如下構成。於本鏈輪總成中，鏈輪為後鏈輪。 (29) The bicycle sprocket assembly of another aspect of the present invention can be constructed as follows. In this sprocket assembly, the sprocket is a rear sprocket.

如此構成鏈輪總成，亦可獲得與上述(1)至(24)所記載之效果相同之效果。 By configuring the sprocket assembly in this way, the same effects as those described in (1) to (24) above can also be obtained.

根據本發明，可提供一種鏈條之保持力較高且生產性優異之自行車用鏈輪。又，可提供一種鏈條之保持力較高且生產性優異之自行車用鏈輪總成。 According to the present invention, it is possible to provide a bicycle sprocket with high chain retention and excellent productivity. In addition, it is possible to provide a bicycle sprocket assembly with high chain retention and excellent productivity.

2:鏈條 2: chain

2a:外鏈板 2a: Outer chain plate

2b:內鏈板 2b: inner chain plate

2c:鏈條輥 2c: chain roller

10:自行車用曲柄總成 10: Crank assembly for bicycle

12:曲柄臂 12: Crank arm

14:第1鏈輪 14: 1st sprocket

14a:第1側面 14a: side 1

14b:第2側面 14b: Second side

16:第2鏈輪 16: 2nd sprocket

16a:第3側面 16a: third side

16b:第4側面 16b: Side 4

19:曲柄軸 19: crankshaft

20:鏈輪安裝部 20: Sprocket mounting part

20a:表面 20a: surface

20b:背面 20b: back

22:臂部 22: Arm

22a:踏板安裝部 22a: Pedal mounting part

22b:連結孔 22b: connecting hole

24:鏈輪安裝臂 24: Sprocket mounting arm

24a:第1安裝部 24a: Installation part 1

24b:第2安裝部 24b: 2nd installation part

26:第1固定螺栓 26: The first fixing bolt

28:第2固定螺栓 28: The second fixing bolt

30:第1鏈輪本體 30: The first sprocket body

30a:第1固定部 30a: The first fixed part

31:第1環狀部 31: The first ring part

32:齒 32: tooth

32a:第1齒 32a: 1st tooth

32a1:變速用之第1齒 32a1: The first tooth for gear shifting

32a2:變速用之第1齒 32a2: The first tooth for gear shifting

32b:第2齒 32b: 2nd tooth

32c:第1變速齒 32c: 1st gear

32d:第1導引面 32d: the first guide surface

32e:第1凹部 32e: The first recess

34:第1變速區域 34: The first shifting area

36a:第1突起 36a: The first protrusion

36b:第2突起 36b: The second protrusion

38:階差部 38: Step part

40:第2鏈輪本體 40: The second sprocket body

40a:第2固定部 40a: The second fixed part

41:第2環狀部 41: The second ring part

42:齒 42: tooth

42a:第3齒 42a: 3rd tooth

42b:第4齒 42b: 4th tooth

42c:第2變速齒 42c: 2nd gear

42d:第2導引面 42d: 2nd guide surface

42e:第2凹部 42e: The second recess

44:第2變速區域 44: 2nd shifting area

52a:第5面 52a: Side 5

52b:第6面 52b: Side 6

52c:齒尖 52c: Tooth tip

110:自行車用曲柄總成 110: Bicycle crank assembly

114:第1鏈輪 114: 1st sprocket

116:第2鏈輪 116: 2nd sprocket

130a:第1貫通孔 130a: 1st through hole

130b:第2貫通孔 130b: 2nd through hole

130c:環構件 130c: Ring member

132:齒 132: tooth

132a:第1齒 132a: 1st tooth

132b:第2齒 132b: 2nd tooth

132b:第1本體部 132b: The first body part

132c:第1追加部 132c: The first additional part

142:齒 142: tooth

142a:第3齒 142a: 3rd tooth

142b:第2本體部 142b: The second body part

142c:第2追加部 142c: Second Additional Part

152a:第1按壓部 152a: The first pressing part

152b:突出部 152b: protrusion

152c:第2按壓部 152c: The second pressing part

214:第1鏈輪 214: 1st sprocket

232a:第1齒 232a: 1st tooth

232b:第2齒 232b: 2nd tooth

233:驅動面 233: drive surface

233a:第1延伸部 233a: first extension

234:非驅動面 234: Non-driving surface

234a:第2延伸部 234a: 2nd extension

314:第1鏈輪 314: 1st sprocket

332a:第1齒 332a: 1st tooth

332b:第2齒 332b: 2nd tooth

342a:第3齒 342a: 3rd tooth

342b:第4齒 342b: 4th tooth

352a:第1面 352a: Side 1

352b:第2面 352b: Side 2

352c:第3面 352c: Side 3

352d:驅動面 352d: drive surface

352e:非驅動面 352e: non-driving surface

352f:前端面 352f: Front face

353:傾斜部 353: Slope

353a:第1倒角面 353a: 1st chamfered surface

353b:第2倒角面 353b: 2nd chamfer surface

353c:第3倒角面 353c: 3rd chamfer surface

353d:第4倒角面 353d: 4th chamfered surface

A:按壓構件 A: Pressing member

B:切削裝置 B: Cutting device

C:按壓構件 C: pressing member

D:模型框 D: model frame

CL:直線 CL: straight line

CP:接觸點 CP: point of contact

R:行進旋轉方向 R: Direction of travel rotation

L1:第1軸方向間隔 L1: Interval in the 1st axis direction

L2:第2軸方向間隔 L2: 2nd axis direction interval

L3:第1軸方向接觸寬度 L3: Contact width in the first axis direction

L4:第2軸方向接觸寬度 L4: Contact width in the second axis direction

W1:第1最大軸方向寬度 W1: The first largest axial width

W2:第2最大軸方向寬度 W2: The second largest axis width

W3:第3最大軸方向寬度 W3: The 3rd largest axial width

W4:第4最大軸方向寬度 W4: The 4th largest axial width

X:旋轉中心軸心 X: Rotation center axis

Y:旋轉中心軸心 Y: Rotation center axis

圖1係本發明第1及第2實施形態之自行車用曲柄總成之前視圖。 Fig. 1 is a front view of a bicycle crank assembly according to the first and second embodiments of the present invention.

圖2係第1實施形態之第1鏈輪之正面立體圖。 Fig. 2 is a front perspective view of the first sprocket of the first embodiment.

圖3係第1實施形態之第1鏈輪之後視圖。 Fig. 3 is a rear view of the first sprocket of the first embodiment.

圖4係第1實施形態之第1及第2鏈輪之背面立體部分體。 Figure 4 is the back three-dimensional partial body of the first and second sprockets of the first embodiment.

圖5係自徑向外側觀察第1實施形態之第1鏈輪及第2鏈輪之剖面部分圖。 Fig. 5 is a partial cross-sectional view of the first sprocket and the second sprocket of the first embodiment viewed from the outside in the radial direction.

圖6係第1實施形態之第2鏈輪之正面立體圖。 Fig. 6 is a front perspective view of the second sprocket of the first embodiment.

圖7係本發明第2實施形態之第1鏈輪之第1齒及第2鏈輪之第3齒之剖視圖。 Fig. 7 is a cross-sectional view of the first tooth of the first sprocket and the third tooth of the second sprocket in the second embodiment of the present invention.

圖8係本發明其他實施形態之第1鏈輪之第1齒及第2鏈輪之第3齒之前視圖。 Fig. 8 is a front view of the first tooth of the first sprocket and the third tooth of the second sprocket in another embodiment of the present invention.

圖9係本發明其他實施形態之第1及第2鏈輪之齒部之部分前視圖。 Fig. 9 is a partial front view of the teeth of the first and second sprockets in another embodiment of the present invention.

圖10係自徑向外側觀察本發明其他實施形態之第1及第2鏈輪之齒部之剖面部分圖。 Fig. 10 is a cross-sectional partial view of the teeth of the first and second sprockets of other embodiments of the present invention viewed from the outside in the radial direction.

圖11係本發明其他實施形態之第1鏈輪之前視圖。 Fig. 11 is a front view of a first sprocket according to another embodiment of the present invention.

圖12A係本發明其他實施形態之第1鏈輪之前視圖。 Fig. 12A is a front view of a first sprocket according to another embodiment of the present invention.

圖12B係本發明其他實施形態之第1鏈輪之部分剖視圖。 Fig. 12B is a partial cross-sectional view of a first sprocket according to another embodiment of the present invention.

圖13係用以說明本發明其他實施形態之第2齒及第4齒之形成形態之模式圖。 Fig. 13 is a schematic diagram for explaining the formation of the second tooth and the fourth tooth in another embodiment of the present invention.

<第1實施形態> <First Embodiment>

如圖1所示，第1實施形態之自行車用曲柄總成10(以下，記載為曲柄總成)具備：曲柄臂12、第1鏈輪14(自行車用鏈輪之一例)、及第2鏈輪16(自行車用鏈輪之一例)。又，第1鏈輪14及第2鏈輪16為自行車用鏈輪總成之一例。 As shown in Figure 1, the bicycle crank assembly 10 of the first embodiment (hereinafter referred to as the crank assembly) includes: a crank arm 12, a first sprocket 14 (an example of a bicycle sprocket), and a second chain Wheel 16 (an example of a bicycle sprocket). In addition, the first sprocket 14 and the second sprocket 16 are an example of a bicycle sprocket assembly.

曲柄總成10中，第1鏈輪14及第2鏈輪16為可扣合於鏈條2之前鏈輪。第2鏈輪16與第1鏈輪14相比齒數較少。鏈條2具有：1對外鏈板 2a、1對內鏈板2b、及連結1對外鏈板2a及1對內鏈板2b之鏈條輥2c。 In the crank assembly 10, the first sprocket 14 and the second sprocket 16 are buckled with the front sprocket of the chain 2. The number of teeth of the second sprocket 16 is smaller than that of the first sprocket 14. Chain 2 has: 1 external chain plate 2a, a pair of inner link plates 2b, and a chain roller 2c connecting a pair of outer link plates 2a and a pair of inner link plates 2b.

<曲柄臂> <Crank arm>

曲柄臂12可一體旋轉地連結於曲柄軸19。曲柄臂12具有：鏈輪安裝部20、與鏈輪安裝部20一體或分開設置之臂部22。 The crank arm 12 is connected to the crank shaft 19 so as to be integrally rotatable. The crank arm 12 has a sprocket mounting portion 20 and an arm portion 22 provided integrally or separately from the sprocket mounting portion 20.

鏈輪安裝部20具有複數個(例如4個)鏈輪安裝臂24。複數個鏈輪安裝臂24於周方向隔開間隔配置。鏈輪安裝臂24之周方向之間隔為等間隔。此處，表示鏈輪安裝臂24之周方向間隔為等間隔時之例，但鏈輪安裝臂24之周方向之間隔亦可為不等間隔。 The sprocket mounting portion 20 has a plurality of (for example, four) sprocket mounting arms 24. The plurality of sprocket attachment arms 24 are arranged at intervals in the circumferential direction. The intervals in the circumferential direction of the sprocket mounting arms 24 are equal intervals. Here, an example is shown when the circumferential interval of the sprocket mounting arm 24 is equal intervals, but the circumferential interval of the sprocket mounting arm 24 may be unequal intervals.

鏈輪安裝臂24具有：第1安裝部24a、與第2安裝部24b。第1安裝部24a為用以安裝第1鏈輪14者。第1安裝部24a形成於鏈輪安裝臂24之前端部。第1安裝部24a例如為貫通孔。於第1安裝部24a，固定有第1鏈輪14。 The sprocket attachment arm 24 has a first attachment portion 24a and a second attachment portion 24b. The first mounting portion 24a is for mounting the first sprocket 14. The first attachment portion 24 a is formed at the front end of the sprocket attachment arm 24. The first mounting portion 24a is, for example, a through hole. The first sprocket 14 is fixed to the first mounting portion 24a.

第2安裝部24b為用以安裝第2鏈輪16者。第2安裝部24b於較第1安裝部24a為徑向內側處，形成於鏈輪安裝臂24之基端部。第2安裝部24b例如為有底之螺孔。於第2安裝部24b，固定有第2鏈輪16。 The second mounting portion 24b is for mounting the second sprocket 16. The second mounting portion 24b is formed at the base end of the sprocket mounting arm 24 at a radially inner side than the first mounting portion 24a. The second mounting portion 24b is, for example, a bottomed screw hole. The second sprocket 16 is fixed to the second attachment portion 24b.

臂部22與鏈輪安裝部20一體或分開形成。此處，臂部22與鏈輪安裝部20一體形成。於臂部22之前端部，設置有踏板安裝部22a。於踏板安裝部22a，可安裝踏板(未圖示)。於臂部22之基端部，設置有連結孔22b。於連結孔22b內，可一體旋轉地連結有曲柄軸19。 The arm portion 22 and the sprocket mounting portion 20 are formed integrally or separately. Here, the arm portion 22 is formed integrally with the sprocket mounting portion 20. At the front end of the arm portion 22, a pedal mounting portion 22a is provided. A pedal (not shown) can be attached to the pedal mounting portion 22a. A connecting hole 22b is provided at the base end of the arm 22. In the connecting hole 22b, a crankshaft 19 is connected so as to be integrally rotatable.

<第1鏈輪> <1st sprocket>

如圖2至圖5所示，第1鏈輪14具有旋轉中心軸心X。第1鏈輪14具備：第1鏈輪本體30(本體部之一例)、第1環狀部31(環狀部之一例)、複數個齒32(第1齒部及第2齒部之一例)、及第1變速區域34(參照圖3及圖4；變速區域之一例)。 As shown in FIGS. 2 to 5, the first sprocket 14 has a rotation center axis X. The first sprocket 14 includes: a first sprocket body 30 (an example of a body portion), a first ring portion 31 (an example of a ring portion), and a plurality of teeth 32 (an example of a first tooth portion and a second tooth portion) ), and the first shifting area 34 (refer to FIGS. 3 and 4; an example of the shifting area).

第1鏈輪本體30為非金屬製，例如碳纖維強化樹脂等合成樹脂製。第1鏈輪本體30與第1環狀部31一體成型。如圖2至圖4所示，第1 鏈輪本體30具有複數個(例如4個)第1固定部30a。複數個第1固定部30a於周方向隔開間隔配置。 The first sprocket body 30 is made of non-metal, for example, made of synthetic resin such as carbon fiber reinforced resin. The first sprocket body 30 and the first annular portion 31 are integrally molded. As shown in Figure 2 to Figure 4, the first The sprocket body 30 has a plurality of (for example, four) first fixing portions 30a. The plurality of first fixing portions 30a are arranged at intervals in the circumferential direction.

各第1固定部30a例如為貫通孔。各第1固定部30a配置於與各第1安裝部24a對向之位置。於該狀態下，將第1固定螺栓26(參照圖1)插通於各第1固定部30a及各第1安裝部24a，並螺合於螺母構件(未圖示)。藉此，將第1鏈輪本體30固定於鏈輪安裝臂24。 Each first fixing portion 30a is, for example, a through hole. Each first fixing portion 30a is arranged at a position facing each first mounting portion 24a. In this state, the first fixing bolt 26 (see FIG. 1) is inserted into each first fixing portion 30a and each first mounting portion 24a, and is screwed to a nut member (not shown). Thereby, the first sprocket body 30 is fixed to the sprocket attachment arm 24.

第1環狀部31安裝於第1鏈輪本體30。詳細而言，第1環狀部31安裝於第1鏈輪本體30之外周，第1環狀部31為金屬製例如鋁製、鈦製、或鐵．不鏽鋼製。於第1環狀部31之外周，設置有複數個齒32。 The first annular portion 31 is attached to the first sprocket body 30. In detail, the first annular portion 31 is installed on the outer periphery of the first sprocket body 30, and the first annular portion 31 is made of metal, such as aluminum, titanium, or iron. Made of stainless steel. A plurality of teeth 32 are provided on the outer circumference of the first annular portion 31.

複數個齒32(包含後述之第1齒32a及第2齒32b)設置於第1環狀部31之外周。詳細而言，複數個齒32(例如30至60個)於第1環狀部31之外周沿周方向排列配置，且一體形成於第1環狀部31之外周部。複數個齒32為金屬製例如鋁製、鈦製、或鐵．不鏽鋼製。 A plurality of teeth 32 (including the first teeth 32a and the second teeth 32b described later) are provided on the outer circumference of the first annular portion 31. In detail, a plurality of teeth 32 (for example, 30 to 60) are arranged side by side in the circumferential direction on the outer periphery of the first annular portion 31, and are integrally formed on the outer periphery of the first annular portion 31. The plurality of teeth 32 are made of metal, such as aluminum, titanium, or iron. Made of stainless steel.

複數個齒32具有複數個第1齒32a(第1齒之一例)、與複數個第2齒32b(第2齒之一例)。第1齒32a及第2齒32b於周方向上交替配置即於周方向相鄰配置。 The plurality of teeth 32 includes a plurality of first teeth 32a (an example of the first tooth) and a plurality of second teeth 32b (an example of the second tooth). The first teeth 32a and the second teeth 32b are alternately arranged in the circumferential direction, that is, adjacently arranged in the circumferential direction.

第1齒32a形成為可扣合於外鏈板2a。詳細而言，第1齒32a可扣合於1對外鏈板2a之軸方向間而形成。第1齒32a以朝向徑向外側軸方向寬度慢慢減小之方式形成為梢細形狀。另，軸方向包含旋轉中心軸心X延伸之方向、及與旋轉中心軸心X平行之方向。此處所使用之軸方向對應於與旋轉中心軸心X平行之方向。 The first tooth 32a is formed so as to be snap-fitted to the outer link plate 2a. In detail, the first tooth 32a can be formed by engaging between the axial direction of the outer link plate 2a. The first teeth 32a are formed in a narrow shape so that the width in the axial direction gradually decreases toward the radially outer side. In addition, the axis direction includes the direction in which the rotation center axis X extends and the direction parallel to the rotation center axis X. The axis direction used here corresponds to the direction parallel to the rotation center axis X.

如圖4所示，第1齒32a較佳為具有第1凹部32e(凹部之一例)。第1凹部32e設置於第1齒32a之角隅部。第1凹部32e之第1側面14a側之面較佳為與第2齒32b之第1側面14a側之面形成於一個面。第1凹部32e之第2側面14b側之面較佳為與第2齒32b之第2側面14b側之面形成於一個面。 As shown in FIG. 4, it is preferable that the 1st tooth 32a has the 1st recessed part 32e (an example of a recessed part). The first recess 32e is provided in the corner of the first tooth 32a. The surface on the first side surface 14a side of the first recess 32e is preferably formed on the same surface as the surface on the first side surface 14a side of the second tooth 32b. The surface on the second side surface 14b side of the first recess 32e is preferably formed on the same surface as the surface on the second side surface 14b side of the second tooth 32b.

此處，第1側面14a(參照圖1)為將曲柄總成10安裝於自行車時，配置於遠離自行車框架之軸方向外側的正面。又，第2側面14b(參照圖3及圖4)為配置於接近自行車框架之軸方向內側之背面。 Here, the first side surface 14a (refer to FIG. 1) is a front surface that is arranged on the outside in the axial direction away from the bicycle frame when the crank assembly 10 is attached to the bicycle. In addition, the second side surface 14b (refer to FIGS. 3 and 4) is arranged on the back surface close to the inner side of the bicycle frame in the axial direction.

第1凹部32e藉由衝壓加工例如鍛造而形成。此處，表示藉由衝壓加工形成第1凹部32e時之例，但第1凹部32e亦可藉由切削加工而形成。 The first recess 32e is formed by press working such as forging. Here, an example when the first recess 32e is formed by press working is shown, but the first recess 32e may be formed by cutting.

如圖5所示，第1凹部32e以對向於內鏈板2b之端部之方式形成。藉由第1凹部32e，避免第1齒32a與內鏈板2b之過度干涉。又，藉由將第1凹部32e設置於第1齒32a，如圖2、圖4及圖5所示，自徑向外側觀察時，第1齒32a(除了變速用之第1齒32a1、32a2)實質上形成為+(加號)形狀。 As shown in FIG. 5, the 1st recessed part 32e is formed so that it may oppose the end part of the inner link plate 2b. With the first recess 32e, excessive interference between the first tooth 32a and the inner link plate 2b is avoided. Moreover, by providing the first recess 32e in the first tooth 32a, as shown in FIGS. 2, 4, and 5, when viewed from the radial outside, the first tooth 32a (except for the first tooth 32a1, 32a2 for speed change) ) Is substantially formed in a + (plus sign) shape.

此處，如圖2至圖3所示，於複數個第1齒32a，包含複數個(例如2個)變速用之第1齒32a1、及複數個(例如2個)變速用之第1齒32a2。變速用之第1齒32a1為用以使鏈條2自第1鏈輪14向第2鏈輪16移動之下降變速者。變速用之第1齒32a2為用以使鏈條2自第2鏈輪16向第1鏈輪14移動之上升變速者。變速用之第1齒32a1及變速用之第1齒32a2較佳為如上所述藉由設置第1凹部32e，使得自徑向外側觀察時實質上形成為T字狀。 Here, as shown in FIGS. 2 to 3, the plural first teeth 32a include plural (for example, two) first teeth 32a1 for shifting, and plural (for example, two) first teeth for shifting 32a2. The first gear 32a1 for gear shifting is a descending gear for moving the chain 2 from the first sprocket 14 to the second sprocket 16. The first gear 32a2 for gear shifting is an upward gear shifter for moving the chain 2 from the second sprocket 16 to the first sprocket 14. The first gear 32a1 for gear shifting and the first gear 32a2 for gear shifting are preferably formed in a substantially T-shape when viewed from the radially outer side by providing the first recess 32e as described above.

如圖5所示，第1齒32a具有第1最大軸方向寬度W1(第1軸方向鏈條扣合寬度之一例)。第1最大軸方向寬度W1為軸方向上第1齒32a之長度最長部分之寬度。第1最大軸方向寬度W1小於1對外鏈板2a之第1軸方向間隔L1。又，第1最大軸方向寬度W1大於1對內鏈板2b之第2軸方向間隔L2。 As shown in FIG. 5, the 1st tooth 32a has the 1st largest axial direction width W1 (an example of the 1st axial direction chain engagement width). The first maximum axial width W1 is the width of the longest portion of the first tooth 32a in the axial direction. The first maximum axial width W1 is smaller than the first axial distance L1 of the outer link plate 2a. In addition, the first maximum axial width W1 is larger than the second axial distance L2 of the pair of inner link plates 2b.

另，第1軸方向間隔L1為軸方向上1對外鏈板2a彼此對向之面之間隔。第2軸方向間隔L2為軸方向上1對內鏈板2b彼此對向之面之間隔。 In addition, the first axial distance L1 is the distance between the surfaces of the outer link plates 2a facing each other in the axial direction. The second axial distance L2 is the distance between the surfaces of the pair of inner link plates 2b facing each other in the axial direction.

如圖2至圖4所示，第2齒32b可扣合於內鏈板2b而形成。詳細而言，第2齒32b可扣合於1對內鏈板2b之軸方向間而形成。 As shown in FIGS. 2 to 4, the second teeth 32b can be formed by engaging the inner link plate 2b. In detail, the second teeth 32b can be formed by engaging between the axial directions of a pair of inner link plates 2b.

第2齒32b較佳為，自徑向外側觀察時實質上形成為-(減號)形狀。第2齒32b以寬度朝向徑向外側軸方向而慢慢減小之方式形成為梢細形狀。 The second tooth 32b is preferably formed in a substantially-(minus sign) shape when viewed from the outside in the radial direction. The second tooth 32b is formed in a narrow shape so that the width gradually decreases toward the radially outer axial direction.

如圖5所示，第2齒32b具有第2最大軸方向寬度W2(第2軸方向鏈條扣合寬度之一例)。第2最大軸方向寬度W2為軸方向上第2齒32b之長度最長部分之寬度。第2最大軸方向寬度W2小於上述第2軸方向間隔L2。第2最大軸方向寬度W2小於第1最大軸方向寬度W1。 As shown in FIG. 5, the 2nd tooth 32b has the 2nd maximum axial direction width W2 (an example of the 2nd axial direction chain engagement width). The second maximum axial width W2 is the width of the longest portion of the second tooth 32b in the axial direction. The second maximum axial direction width W2 is smaller than the above-mentioned second axial direction interval L2. The second maximum axial width W2 is smaller than the first maximum axial width W1.

藉由如下般加工第2齒32b而形成第2齒32b，從而滿足上述構成。第2齒32b係藉由材料之變形而形成。詳細而言，第2齒32b係藉由衝壓加工形成。更詳細而言，第2齒32b藉由鍛造形成。具體而言，第2齒32b與第1凹部32e一同藉由鍛造形成。藉由如此對第2齒32b進行衝壓加工例如鍛造，設定第2齒32b之第2最大軸方向寬度W2。 The second teeth 32b are formed by processing the second teeth 32b as follows to satisfy the above-mentioned configuration. The second tooth 32b is formed by deformation of the material. Specifically, the second teeth 32b are formed by pressing. In more detail, the second tooth 32b is formed by forging. Specifically, the second tooth 32b is formed by forging together with the first recess 32e. By performing press processing, such as forging, on the second teeth 32b in this manner, the second maximum axial width W2 of the second teeth 32b is set.

第1變速區域34係為了使鏈條2變速而設置。第1變速區域34為自第2鏈輪16向第1鏈輪14之上升變速動作時，鏈條扣合於第1鏈輪14之齒32之區域。又，第1變速區域34為自第1鏈輪14向第2鏈輪16之下降變速動作時，鏈條自第1鏈輪14之齒32離開之區域。 The first speed change area 34 is provided for changing the speed of the chain 2. The first speed change area 34 is an area where the chain is engaged with the teeth 32 of the first sprocket 14 during the ascending speed change operation from the second sprocket 16 to the first sprocket 14. In addition, the first speed change area 34 is an area where the chain is separated from the teeth 32 of the first sprocket 14 during the lowering speed change operation from the first sprocket 14 to the second sprocket 16.

如圖2至圖4所示，於第1變速區域34，包含複數個第1變速齒32c。此處，複數個(例如2個)變速用之第1齒32a1對應於第1變速齒32c。又，鄰接於各變速用之第1齒32a1之2個第2齒32b對應於第1變速齒32c。 As shown in FIGS. 2 to 4, the first shifting area 34 includes a plurality of first shifting teeth 32c. Here, plural (for example, two) first gears 32a1 for shifting correspond to the first shifting teeth 32c. In addition, the two second teeth 32b adjacent to each of the first gears 32a1 for shifting correspond to the first shifting teeth 32c.

如圖2及圖3所示，第1變速齒32c具有第1導引面32d。第1導引面32d為用以引導鏈條2者。第1導引面32d係於第1鏈輪14之第1側面14a(參照圖2)側、或第2側面14b(參照圖3及圖4)側，設置於第1變速齒32c。第1導引面32d係以厚度朝向第1變速齒32c之側部而慢慢變薄之 方式凹陷而形成。 As shown in Figs. 2 and 3, the first shift tooth 32c has a first guide surface 32d. The first guide surface 32d is for guiding the chain 2. The first guide surface 32d is on the first side surface 14a (refer to FIG. 2) side or the second side surface 14b (refer to FIGS. 3 and 4) side of the first sprocket 14, and is provided on the first shift tooth 32c. The first guide surface 32d gradually becomes thinner with a thickness toward the side of the first shift tooth 32c The way is recessed and formed.

又，於第1變速區域34，較佳為包含第1突起36a、與第2突起36b。 In addition, the first shift region 34 preferably includes a first protrusion 36a and a second protrusion 36b.

第1突起36a及第2突起36b可支持鏈條2地設置於第1鏈輪本體30。此處，將1對第1突起36a及第2突起36b於周方向隔開間隔配置。 The first protrusion 36a and the second protrusion 36b are provided on the first sprocket body 30 so as to support the chain 2. Here, a pair of first protrusions 36a and second protrusions 36b are arranged at intervals in the circumferential direction.

第1突起36a係為了將鏈條2引導至第1鏈輪14之齒32，而於第1鏈輪本體30之第2側面14b突出設置。例如，第1突起36a將鏈條2引導至圖3中陰影所示之第2齒32b。第2突起36b係為了將鏈條2引導至第1突起36a，而於第1鏈輪本體30之第2側面14b突出設置。 In order to guide the chain 2 to the teeth 32 of the first sprocket 14, the first protrusion 36 a protrudes from the second side surface 14 b of the first sprocket body 30. For example, the first protrusion 36a guides the chain 2 to the second tooth 32b shown by hatching in FIG. 3. The second protrusion 36b protrudes from the second side surface 14b of the first sprocket body 30 in order to guide the chain 2 to the first protrusion 36a.

再者，如圖3及圖4所示，於第1變速區域34，包含階差部38。階差部38為用以使支持於第1突起36a之鏈條2容易扣合於第1鏈輪14之齒32者。階差部38於第1側面14a中，較複數個齒32之齒底，設置於徑向內側。又，階差部38以第1突起36a為基準，設置於行進旋轉方向R之下游側。階差部38實質上呈三角形狀凹陷地形成。 Furthermore, as shown in FIGS. 3 and 4, the first shifting area 34 includes a step portion 38. The step portion 38 is used to make the chain 2 supported by the first protrusion 36a easily engage with the teeth 32 of the first sprocket 14. The step portion 38 is provided on the inner side in the radial direction from the tooth bottoms of the plurality of teeth 32 in the first side surface 14a. In addition, the step portion 38 is provided on the downstream side in the traveling rotation direction R with the first protrusion 36a as a reference. The step portion 38 is substantially formed in a triangular shape and recessed.

<第2鏈輪> <2nd sprocket>

如圖4及圖6所示，第2鏈輪16具有旋轉中心軸心Y。旋轉中心軸心Y與旋轉中心軸心X同心。第2鏈輪16具備：第2鏈輪本體40(本體部之一例)、第2環狀部41(環狀部之一例)、複數個齒42(第1齒部及第2齒部之一例)、及第2變速區域44(變速區域之一例)。 As shown in FIGS. 4 and 6, the second sprocket 16 has a rotation center axis Y. The rotation center axis Y is concentric with the rotation center axis X. The second sprocket 16 includes: a second sprocket body 40 (an example of a body portion), a second ring portion 41 (an example of a ring portion), and a plurality of teeth 42 (an example of a first tooth portion and a second tooth portion) ), and the second shifting area 44 (an example of a shifting area).

第2鏈輪本體40為金屬製例如鋁製、鈦製、或鐵．不鏽鋼製。第2鏈輪本體40具有複數個(例如4個)第2固定部40a。複數個第2固定部40a於周方向隔開間隔配置。 The second sprocket body 40 is made of metal, such as aluminum, titanium, or iron. Made of stainless steel. The second sprocket body 40 has a plurality of (for example, four) second fixed portions 40a. The plurality of second fixed portions 40a are arranged at intervals in the circumferential direction.

各第2固定部40a例如為貫通孔。各第2固定部40a配置於與各第2安裝部24b對向之位置。於該狀態下，將第2固定螺栓28插通於各第2固定部40a及第2安裝部24b，並將第2固定螺栓28螺合於螺母構件(未圖示)。藉此，將第2鏈輪本體40固定於鏈輪安裝臂24。 Each second fixing portion 40a is, for example, a through hole. Each second fixing portion 40a is arranged at a position facing each second mounting portion 24b. In this state, the second fixing bolt 28 is inserted into each of the second fixing portion 40a and the second mounting portion 24b, and the second fixing bolt 28 is screwed to a nut member (not shown). Thereby, the second sprocket body 40 is fixed to the sprocket attachment arm 24.

第2環狀部41安裝於第2鏈輪本體40之外周。第2環狀部41為金屬製例如鋁製、鈦製、或鐵．不鏽鋼製。於第2環狀部41之外周，設置有複數個齒42。 The second annular portion 41 is attached to the outer circumference of the second sprocket body 40. The second annular portion 41 is made of metal, such as aluminum, titanium, or iron. Made of stainless steel. A plurality of teeth 42 are provided on the outer circumference of the second annular portion 41.

複數個齒42(包含後述之第3齒42a及第4齒42b)設置於第2環狀部41之外周。詳細而言，複數個齒42(例如20至40個)於第2環狀部41之外周沿周方向排列配置，且一體形成於第2環狀部41之外周部。複數個齒42為金屬製例如鋁製、鈦製、或鐵．不鏽鋼製。 A plurality of teeth 42 (including third teeth 42a and fourth teeth 42b described later) are provided on the outer circumference of the second annular portion 41. Specifically, a plurality of teeth 42 (for example, 20 to 40) are arranged side by side in the circumferential direction on the outer circumference of the second annular portion 41, and are integrally formed on the outer circumference of the second annular portion 41. The plurality of teeth 42 are made of metal, such as aluminum, titanium, or iron. Made of stainless steel.

複數個齒42具有複數個第3齒42a(第1齒之一例)、與複數個第4齒42b(第2齒之一例)。第3齒42a及第4齒42b於周方向上交替配置即於周方向相鄰配置。 The plurality of teeth 42 has a plurality of third teeth 42a (an example of the first tooth) and a plurality of fourth teeth 42b (an example of the second tooth). The third teeth 42a and the fourth teeth 42b are alternately arranged in the circumferential direction, that is, adjacently arranged in the circumferential direction.

第3齒42a可扣合於外鏈板2a而形成。詳細而言，第3齒42a可扣合於1對外鏈板2a之軸方向間而形成。第3齒42a以寬度朝向徑向外側軸方向而慢慢減小之方式形成為梢細形狀。 The third tooth 42a can be formed by engaging with the outer link plate 2a. In detail, the third tooth 42a can be formed by engaging between the axial direction of the outer link plate 2a. The third teeth 42a are formed in a narrow shape so that the width gradually decreases toward the radially outer axial direction.

如圖6所示，第3齒42a具有第2凹部42e(凹部之一例)。第2凹部42e設置於第3齒42a之角隅部。第2凹部42e之第1側面14a側之面與第4齒42b之第1側面14a側之面形成於一個面。第2凹部42e之第2側面14b側之面與第2齒32b之第2側面14b側之面形成於一個面。 As shown in FIG. 6, the 3rd tooth 42a has the 2nd recessed part 42e (an example of a recessed part). The second recess 42e is provided at the corner of the third tooth 42a. The surface on the side of the first side surface 14a of the second recess 42e and the surface on the side of the first side surface 14a of the fourth tooth 42b are formed on one surface. The surface on the second side surface 14b side of the second recess 42e and the surface on the second side surface 14b side of the second tooth 32b are formed on one surface.

第2凹部42e係藉由衝壓加工例如鍛造形成。此處，表示藉由衝壓加工形成第2凹部42e時之例，但亦可藉由切削加工形成第2凹部42e。 The second recess 42e is formed by press working such as forging. Here, an example in the case where the second recess 42e is formed by press processing is shown, but the second recess 42e may be formed by cutting processing.

第2凹部42e與上述第1凹部32e相同，以對向於內鏈板2b之端部之方式形成。藉由第2凹部42e，避免第3齒42a與內鏈板2b之過度干涉。又，藉由將第2凹部42e設置於第3齒42a，如圖4及圖6所示，自徑向外側觀察時，第3齒42a實質上形成為+(加號)形狀。 The second recessed portion 42e is the same as the above-mentioned first recessed portion 32e, and is formed so as to face the end of the inner link plate 2b. The second recess 42e avoids excessive interference between the third teeth 42a and the inner link plate 2b. Moreover, by providing the second recessed portion 42e on the third tooth 42a, as shown in FIGS. 4 and 6, the third tooth 42a is substantially formed in a + (plus sign) shape when viewed from the outside in the radial direction.

如圖5所示，第3齒42a具有第3最大軸方向寬度W3(第1軸方向鏈條扣合寬度之一例)。第3最大軸方向寬度W3為軸方向上第3齒42a之長度最長部分之寬度。第3最大軸方向寬度W3小於第1軸方向間隔 L1。又，第3最大軸方向寬度W3大於1對內鏈板2b之第2軸方向間隔L2。 As shown in FIG. 5, the 3rd tooth 42a has the 3rd largest axial direction width W3 (an example of the 1st axial direction chain engagement width). The third maximum axial width W3 is the width of the longest portion of the third tooth 42a in the axial direction. The third largest axial width W3 is smaller than the first axial distance L1. In addition, the third maximum axial width W3 is larger than the second axial distance L2 of the pair of inner link plates 2b.

如圖4至圖6所示，第4齒42b可扣合於內鏈板2b而形成。詳細而言，第4齒42b可扣合於1對內鏈板2b之軸方向間而形成。 As shown in FIGS. 4 to 6, the fourth tooth 42b can be formed by engaging with the inner link plate 2b. In detail, the fourth tooth 42b can be formed by engaging between the axial directions of a pair of inner link plates 2b.

自徑向外側觀察時，第4齒42b實質上形成為-(減號)形狀。第4齒42b以寬度朝向徑向外側軸方向而慢慢減小之方式形成為梢細形狀。 When viewed from the outside in the radial direction, the fourth tooth 42b is substantially formed in a-(minus sign) shape. The fourth tooth 42b is formed in a narrow shape so that the width gradually decreases toward the radially outer axial direction.

如圖5所示，第4齒42b具有第4最大軸方向寬度W4(第2軸方向鏈條扣合寬度之一例)。第4最大軸方向寬度W4為軸方向上第4齒42b之長度最長部分之寬度。第4最大軸方向寬度W4小於第2軸方向間隔L2。又，第4最大軸方向寬度W4小於第3最大軸方向寬度W3。 As shown in FIG. 5, the 4th tooth 42b has the 4th maximum axial direction width W4 (an example of the 2nd axial direction chain engagement width). The fourth maximum axial width W4 is the width of the longest portion of the fourth tooth 42b in the axial direction. The fourth maximum axial direction width W4 is smaller than the second axial direction interval L2. In addition, the fourth maximum axial width W4 is smaller than the third maximum axial width W3.

藉由如下般加工第4齒42b，以滿足上述構成之方式形成第4齒42b。第4齒42b係藉由材料之變形而形成。詳細而言，第4齒42b藉由衝壓加工形成。更詳細而言，第4齒42b藉由鍛造形成。藉由如此對第4齒42b進行衝壓加工例如鍛造，設定第4齒42b之第4最大軸方向寬度W4。 The fourth teeth 42b are processed as follows to form the fourth teeth 42b so as to satisfy the above-mentioned configuration. The fourth tooth 42b is formed by deformation of the material. Specifically, the fourth teeth 42b are formed by press working. In more detail, the fourth tooth 42b is formed by forging. By performing press processing, such as forging, on the fourth tooth 42b in this way, the fourth maximum axial width W4 of the fourth tooth 42b is set.

第2變速區域44係為了使鏈條2變速而設置。第2變速區域44為自第2鏈輪16向第1鏈輪14之上升變速動作時、或自第1鏈輪14向第2鏈輪16之下降變速動作時，鏈條扣合於第1鏈輪14之齒42之區域、或自第1鏈輪14之齒42離開之區域。 The second speed change area 44 is provided for changing the speed of the chain 2. The second speed change area 44 is when the chain is engaged with the first chain during the ascending and shifting action from the second sprocket 16 to the first sprocket 14, or during the descending and shifting action from the first sprocket 14 to the second sprocket 16. The area of the teeth 42 of the wheel 14 or the area away from the teeth 42 of the first sprocket 14.

於第2變速區域44，包含複數個(例如2個)第2變速齒42c。第2變速齒42c於周方向隔開間隔設置。第2變速齒42c具有第2導引面42d。第2導引面42d設置於與第3側面16a(參照圖1)相反側之第4側面16b(參照圖6)，並引導鏈條2。第2導引面42d以厚度朝向第2變速齒42c之側部而慢慢變薄之方式凹陷而形成。 The second speed change area 44 includes a plurality of (for example, two) second speed change teeth 42c. The second shift teeth 42c are provided at intervals in the circumferential direction. The second shift tooth 42c has a second guide surface 42d. The second guide surface 42d is provided on the fourth side surface 16b (refer to FIG. 6) opposite to the third side surface 16a (refer to FIG. 1), and guides the chain 2. The second guide surface 42d is formed by being recessed so that its thickness gradually becomes thinner toward the side portion of the second shift tooth 42c.

此處，第2鏈輪16之第3側面16a為將曲柄總成10安裝於自行車時，配置於遠離自行車框架之軸方向外側之正面。第4側面16b為配置 於接近自行車框架之軸方向內側之背面。 Here, the third side surface 16a of the second sprocket 16 is the front side that is arranged on the outside in the axial direction away from the bicycle frame when the crank assembly 10 is mounted on the bicycle. The 4th side 16b is the configuration On the back side close to the inner side of the axis of the bicycle frame.

另，此處，表示第2變速區域44不包含第1變速區域34所具有之突起及凹部時之例，但第2變速區域44可包含突起及凹部至少任一者。 In addition, here is shown an example when the second shifting area 44 does not include the protrusions and recesses that the first shifting area 34 has, but the second shifting area 44 may include at least any one of the protrusions and the recesses.

<曲柄總成之變速動作> <Shifting action of crank assembly>

於此種構成之曲柄總成10中，於藉由前變速器(未圖示)自第2鏈輪16向第1鏈輪14進行上升變速動作時，曲柄總成10向行進旋轉方向R旋轉。於該狀態下，當前變速器自對向於第2鏈輪16之位置移動至對向於第1鏈輪14之位置時，鏈條2自第2鏈輪16之齒離開。如此，該鏈條2支持於第2突起36b並向徑向外側移動。如此，鏈條2經由第1變速區域34之階差部38支持於第1突起36a，且扣合於第1鏈輪14之齒32而被引導。 In the crank assembly 10 having such a structure, when the upshifting operation is performed from the second sprocket 16 to the first sprocket 14 by the front derailleur (not shown), the crank assembly 10 rotates in the traveling rotation direction R. In this state, when the current transmission moves from a position opposed to the second sprocket 16 to a position opposed to the first sprocket 14, the chain 2 separates from the teeth of the second sprocket 16. In this way, the chain 2 is supported by the second protrusion 36b and moves radially outward. In this way, the chain 2 is supported by the first protrusion 36a via the step portion 38 of the first speed change region 34, and is engaged with the teeth 32 of the first sprocket 14 to be guided.

另一方面，於藉由前變速器自第1鏈輪14向第2鏈輪16進行下降變速動作時，使曲柄總成10向行進旋轉方向R旋轉。於該狀態下，當前變速器自對向於第1鏈輪14之位置移動至對向於第2鏈輪16之位置時，鏈條2自第1鏈輪14之齒離開。如此，該鏈條2被引導向第2鏈輪16之齒42，並與齒42扣合。 On the other hand, when the lowering gear shift operation is performed from the first sprocket 14 to the second sprocket 16 by the front derailleur, the crank assembly 10 is rotated in the traveling rotation direction R. In this state, when the current transmission moves from a position opposed to the first sprocket 14 to a position opposed to the second sprocket 16, the chain 2 is separated from the teeth of the first sprocket 14. In this way, the chain 2 is guided to the teeth 42 of the second sprocket 16 and engages with the teeth 42.

<第2實施形態> <Second Embodiment>

第2實施形態之自行車用曲柄總成110如圖1所示，具備：曲柄臂12、第1鏈輪114(自行車用鏈輪之一例)、及第2鏈輪116(自行車用鏈輪之一例)。又，第1鏈輪114及第2鏈輪116為自行車用鏈輪總成之一例。 The bicycle crank assembly 110 of the second embodiment is shown in FIG. 1 and includes a crank arm 12, a first sprocket 114 (an example of a bicycle sprocket), and a second sprocket 116 (an example of a bicycle sprocket) ). In addition, the first sprocket 114 and the second sprocket 116 are an example of a bicycle sprocket assembly.

第2實施形態之構成除了第1鏈輪114及第2鏈輪116之構成以外，與第1實施形態之構成實質上相同。因此，此處，僅說明第1鏈輪114及第2鏈輪116之構成，省略與第1實施形態之構成實質上相同之構成之說明。另，此處省略說明之構成係以第1實施形態構成之說明為 準。又，對與第1實施形態相同之構成，標註相同之符號。 The configuration of the second embodiment is substantially the same as the configuration of the first embodiment except for the configuration of the first sprocket 114 and the second sprocket 116. Therefore, here, only the configuration of the first sprocket 114 and the second sprocket 116 will be described, and the description of the configuration that is substantially the same as the configuration of the first embodiment will be omitted. In addition, the configuration omitted here is based on the description of the configuration of the first embodiment as quasi. In addition, the same components as those in the first embodiment are given the same reference numerals.

第1鏈輪114具備：第1鏈輪本體30(本體部之一例)、第1環狀部31(環狀部之一例)、複數個齒132(第1齒部及第2齒部之一例)、及第1變速區域34(變速區域之一例)。 The first sprocket 114 includes: a first sprocket body 30 (an example of a body portion), a first ring portion 31 (an example of a ring portion), and a plurality of teeth 132 (an example of a first tooth portion and a second tooth portion) ), and the first shift area 34 (an example of a shift area).

此處，由於第1鏈輪本體30之構成、第1環狀部31之構成、及第1變速區域34之構成與第1實施形態之構成實質上相同，故此處省略說明。又，關於複數個齒132之構成，以下僅對與第1實施形態之構成不同之構成進行說明。 Here, since the structure of the first sprocket body 30, the structure of the first annular portion 31, and the structure of the first shifting region 34 are substantially the same as the structure of the first embodiment, the description is omitted here. In addition, regarding the configuration of the plurality of teeth 132, only the configuration that is different from the configuration of the first embodiment will be described below.

如圖7所示，複數個齒132中所包含之複數個第1齒132a(第1齒之一例)各者具有第1本體部132ab、第1凹部32e、及第1追加部132c。由於第1凹部32e為與第1實施形態相同之構成，故此處省略說明。 As shown in FIG. 7, each of the plurality of first teeth 132a (an example of the first tooth) included in the plurality of teeth 132 has a first body portion 132ab, a first recessed portion 32e, and a first additional portion 132c. Since the first recessed portion 32e has the same configuration as that of the first embodiment, the description is omitted here.

第1本體部132ab設置於第1環狀部31。詳細而言，第1本體部132b以自第1環狀部31朝向徑向外方突出之方式與第1環狀部31一體形成。第1本體部132ab具有：第1側面14a側之表面20a、與第2側面14b側之背面20b。背面20b為旋轉中心軸心X之軸方向上之、與表面20a相反側之面。 The first body portion 132ab is provided in the first annular portion 31. In detail, the first body portion 132b is formed integrally with the first annular portion 31 so as to protrude outward in the radial direction from the first annular portion 31. The first body portion 132ab has a surface 20a on the side of the first side surface 14a and a back surface 20b on the side of the second side surface 14b. The back surface 20b is a surface on the opposite side to the surface 20a in the axis direction of the rotation center axis X.

第1追加部132c係為了擴寬第1本體部132ab之寬度而安裝於第1本體部132ab。詳細而言，第1追加部132c安裝於第1本體部132ab之表面20a及背面20b各者。如此，藉由於第1本體部132ab之表面20a及背面20b各者安裝第1追加部132c，將第1最大軸方向寬度W1設定為特定之寬度。第1追加部132c為金屬製例如鋁製、鈦製、或鐵．不鏽鋼製。該第1追加部132c藉由接著、擴散接合、鉚合或鑄造安裝於第1齒132a。 The first additional portion 132c is attached to the first body portion 132ab in order to widen the width of the first body portion 132ab. Specifically, the first additional portion 132c is attached to each of the front surface 20a and the back surface 20b of the first body portion 132ab. In this way, by attaching the first additional portion 132c to each of the front surface 20a and the back surface 20b of the first main body portion 132ab, the first maximum axial width W1 is set to a specific width. The first additional portion 132c is made of metal, such as aluminum, titanium, or iron. Made of stainless steel. The first additional portion 132c is attached to the first tooth 132a by bonding, diffusion bonding, riveting, or casting.

另，此處，表示將第1追加部132c安裝於第1本體部132ab之表面20a及背面20b各者時之例。亦可代替此，將第1追加部132c僅安裝於第1本體部132ab之表面20a、或僅背面20b，藉此設定第1最大軸方向寬度W1。 Here, an example in which the first additional portion 132c is attached to each of the front surface 20a and the back surface 20b of the first body portion 132ab is shown. Instead of this, the first additional portion 132c may be attached only to the front surface 20a of the first body portion 132ab or only the back surface 20b, thereby setting the first maximum axial width W1.

第2鏈輪116具備：第2鏈輪本體40(本體部之一例)、第2環狀部41(環狀部之一例)、複數個齒142(第1齒部及第2齒部之一例)、及第2變速區域44(變速區域之一例)。 The second sprocket 116 includes: a second sprocket body 40 (an example of a body portion), a second ring portion 41 (an example of a ring portion), and a plurality of teeth 142 (an example of a first tooth portion and a second tooth portion) ), and the second shifting area 44 (an example of a shifting area).

此處，由於第2鏈輪本體40之構成、第2環狀部41之構成、及第2變速區域44之構成與第1實施形態之構成實質上相同，故此處省略說明。又，關於複數個齒142之構成，僅對與第1實施形態之構成不同之構成，以下進行說明。 Here, since the configuration of the second sprocket body 40, the configuration of the second annular portion 41, and the configuration of the second shifting region 44 are substantially the same as the configuration of the first embodiment, the description is omitted here. In addition, regarding the configuration of the plurality of teeth 142, only the configuration that is different from the configuration of the first embodiment will be described below.

又，複數個齒142中所包含之複數個第3齒142a(第1齒之一例)各者具有：第2本體部142b、與第2追加部142c。第2本體部142b及第2追加部142c之構成與上述第1本體部132ab及第1追加部132c之構成實質上相同。即，藉由於第2本體部142b之表面20a及背面20b各者安裝第2追加部142c，將第3最大軸方向寬度W3設為特定之寬度。 In addition, each of the plurality of third teeth 142a (an example of the first tooth) included in the plurality of teeth 142 has a second body portion 142b and a second additional portion 142c. The configuration of the second main body portion 142b and the second additional portion 142c is substantially the same as the configuration of the first main body portion 132ab and the first additional portion 132c described above. That is, by attaching the second additional portion 142c to each of the front surface 20a and the back surface 20b of the second body portion 142b, the third maximum axial direction width W3 is set to a specific width.

<其他實施形態> <Other embodiments>

以上，已對本發明一實施形態進行說明，但本發明並非限定於上述實施形態者，於不脫離發明主旨之範圍可有各種變更。尤其是，本說明書中所記載之複數個實施形態及變化例可根據需要而任意組合。 As mentioned above, an embodiment of the present invention has been described, but the present invention is not limited to the above-mentioned embodiment, and various changes can be made without departing from the scope of the invention. In particular, the plural embodiments and modification examples described in this specification can be combined arbitrarily as needed.

(a)於上述第1及第2實施形態中，例示2個前鏈輪14、16(114、116)作為自行車用鏈輪總成，但本發明不限定於此。本發明可應用於不具有變速區域之僅具備1個前鏈輪之自行車用總成。 (a) In the above-mentioned first and second embodiments, two front sprockets 14 and 16 (114, 116) are exemplified as bicycle sprocket assemblies, but the present invention is not limited to this. The present invention can be applied to a bicycle assembly with only one front sprocket that does not have a shifting area.

(b)於上述第1及第2實施形態中，表示一體形成第2鏈輪本體40與複數個齒42、142時之例，但本發明不限定於此。第2鏈輪本體40與複數個齒42、142可分開。例如，可將複數個齒42、142設為金屬製，將第2鏈輪本體40設為非金屬製。於該情形時，使用鋁製、鈦製、或鐵．不鏽鋼製作為金屬，使用碳纖維強化樹脂等合成樹脂作為非金屬，藉此可謀求輕量化。 (b) In the first and second embodiments described above, an example in which the second sprocket body 40 and the plurality of teeth 42 and 142 are integrally formed is shown, but the present invention is not limited to this. The second sprocket body 40 and the plurality of teeth 42 and 142 can be separated. For example, the plurality of teeth 42 and 142 may be made of metal, and the second sprocket body 40 may be made of non-metal. In this case, use aluminum, titanium, or iron. Stainless steel is made of metal, and synthetic resins such as carbon fiber reinforced resin are used as non-metals, thereby achieving weight reduction.

(c)於上述第1及第2實施形態中，可如圖8所示構成第1齒32a、132a及第2齒32b扣合於鏈條輥2c之部分、與第3齒42a、142a及第4齒42b扣合於鏈條輥2c之部分。 (c) In the above-mentioned first and second embodiments, the first teeth 32a, 132a and the second teeth 32b can be configured as shown in FIG. 8 to engage with the chain roller 2c, and the third teeth 42a, 142a and the first teeth The four teeth 42b are engaged with the part of the chain roller 2c.

該構成於第1鏈輪14、114及第2鏈輪16、116中實質上相同。因此，此處使用第1鏈輪14、114之第1齒232a及第2齒232b說明該構成。 This structure is substantially the same in the first sprockets 14, 114 and the second sprockets 16, 116. Therefore, the first tooth 232a and the second tooth 232b of the first sprockets 14 and 114 are used here to describe the structure.

於第1齒232a及第2齒232b之間，可扣合鏈條輥2c(參照圖1及圖5)。如圖8所示，第1齒232a及第2齒232b各者具有驅動面233、與非驅動面234。 Between the first tooth 232a and the second tooth 232b, the chain roller 2c can be engaged (refer to FIGS. 1 and 5). As shown in FIG. 8, each of the first tooth 232 a and the second tooth 232 b has a driving surface 233 and a non-driving surface 234.

由於該構成於第1齒232a及第2齒232b中實質上相同，故此處使用第1齒232a進行說明。 Since this structure is substantially the same in the 1st tooth 232a and the 2nd tooth 232b, here, it demonstrates using the 1st tooth 232a.

第1齒232a及第2齒232b各者具有：第1側面14a側之表面20a、第2側面14b側之背面(未圖示)、驅動面233、及非驅動面234。背面20b為旋轉中心軸心X之軸方向(圖8之垂直於紙面之方向)上之、與表面20a相反側之面。 Each of the first tooth 232a and the second tooth 232b has a surface 20a on the side of the first side surface 14a, a back surface (not shown) on the side of the second side surface 14b, a driving surface 233, and a non-driving surface 234. The back surface 20b is the surface opposite to the surface 20a in the axis direction of the rotation center axis X (the direction perpendicular to the paper surface in FIG. 8).

驅動面233為於行進旋轉方向R之下游側、將表面20a及背面連結於軸方向之面。驅動面233包含：接觸點CP、與第1延伸部233a(驅動面延伸部之一例)。接觸點CP為鏈條輥2c接觸之部分。詳細而言，接觸點CP為驅動時、鏈條輥2c接觸於驅動面233之點。 The driving surface 233 is a surface that connects the front surface 20a and the back surface in the axial direction on the downstream side in the traveling rotation direction R. The driving surface 233 includes a contact point CP and a first extension 233a (an example of a driving surface extension). The contact point CP is the part which the chain roller 2c contacts. Specifically, the contact point CP is a point where the chain roller 2c contacts the driving surface 233 during driving.

第1延伸部233a一體形成於驅動面233。第1延伸部233a較接觸點CP於徑向外側、於周方向延伸。具體而言，第1延伸部233a較接觸點CP於徑向外側、於行進旋轉方向R之下游側突出。 The first extension 233a is integrally formed on the driving surface 233. The first extension 233a extends radially outward from the contact point CP in the circumferential direction. Specifically, the first extension 233a protrudes outward in the radial direction from the contact point CP on the downstream side in the traveling rotation direction R.

非驅動面234為於行進旋轉方向R之上游側、將表面20a及背面連結於軸方向之面。例如，非驅動面234相對於連結旋轉中心軸心X、與第1齒232a(第2齒232b)之周方向中心位置之直線CL，與驅動面233線對稱地形成。非驅動面234亦可相對於連結旋轉中心軸心X、與第1齒232a(第2齒232b)之周方向中心位置之直線CL，與驅動面233非對稱 地形成。 The non-driving surface 234 is a surface that connects the front surface 20a and the back surface in the axial direction on the upstream side in the traveling rotation direction R. For example, the non-driving surface 234 is formed line-symmetrically to the driving surface 233 with respect to a straight line CL connecting the rotation center axis X and the circumferential center position of the first tooth 232a (second tooth 232b). The non-driving surface 234 may also be asymmetric to the driving surface 233 with respect to the straight line CL connecting the rotation center axis X and the circumferential center position of the first tooth 232a (second tooth 232b) 地 formed.

非驅動面234包含第2延伸部234a(非驅動面延伸部之一例)。藉由第2延伸部234a，抑制鏈條輥2c向徑向外側之移動。第2延伸部234a一體形成於非驅動面234。此處，如上所述由於非驅動面234與驅動面233線對稱地形成，故第2延伸部234a於周方向、向與第1延伸部233a相反側延伸。即，第2延伸部234a於周方向例如向行進旋轉方向R之上游側延伸。 The non-driving surface 234 includes a second extension 234a (an example of a non-driving surface extension). The second extension 234a suppresses the movement of the chain roller 2c to the outside in the radial direction. The second extension portion 234a is integrally formed on the non-driving surface 234. Here, as described above, since the non-driving surface 234 and the driving surface 233 are formed line-symmetrically, the second extension portion 234a extends in the circumferential direction to the side opposite to the first extension portion 233a. That is, the second extension portion 234a extends in the circumferential direction, for example, to the upstream side of the traveling rotation direction R.

藉此，藉由驅動面233，可將第1鏈輪14之驅動力確實地傳遞至鏈條輥2c即鏈條2。又，藉由驅動面233及非驅動面234，可確實地抑制鏈條輥2c向徑向外側之移動。 Thereby, by the driving surface 233, the driving force of the first sprocket 14 can be reliably transmitted to the chain roller 2c, that is, the chain 2. In addition, the driving surface 233 and the non-driving surface 234 can reliably suppress the movement of the chain roller 2c to the outside in the radial direction.

另，此處，表示第1齒232a及第2齒232b各者均具有驅動面233與非驅動面234時之例，但可代替此，以僅第1齒232a、或僅第2齒232b具有驅動面233與非驅動面234之方式構成。又，亦可以第1齒232a、及/或第2齒232b僅具有驅動面233、或僅具有非驅動面234之方式構成。 In addition, here is shown an example when each of the first tooth 232a and the second tooth 232b has a driving surface 233 and a non-driving surface 234, but instead of this, only the first tooth 232a or only the second tooth 232b has The driving surface 233 and the non-driving surface 234 are configured in a manner. In addition, the first tooth 232a and/or the second tooth 232b may be configured to have only the driving surface 233 or only the non-driving surface 234.

(d)於上述第1及第2實施形態中，表示前鏈輪14、16經由曲柄臂12而不可移動地安裝於曲柄軸19時之例。但可代替此，前鏈輪14、16為沿著曲柄軸19(旋轉中心軸心X)移動者。又，亦可僅使用1個前鏈輪14，且該前鏈輪14為沿著曲柄軸19(旋轉中心軸心X)移動者。 (d) In the above-mentioned first and second embodiments, the case where the front sprockets 14 and 16 are immovably attached to the crankshaft 19 via the crank arm 12 is shown. However, instead of this, the front sprockets 14 and 16 are movable along the crankshaft 19 (rotation center axis X). In addition, only one front sprocket 14 may be used, and the front sprocket 14 may move along the crankshaft 19 (rotation center axis X).

(e)上述第1及第2實施形態所示之前鏈輪14、16可藉由3D列印機形成輪廓，其後，藉由衝壓加工例如鍛造形成第2齒32b及第4齒42b。 (e) As shown in the above-mentioned first and second embodiments, the sprockets 14 and 16 can be contoured by a 3D printer, and thereafter, the second teeth 32b and the fourth teeth 42b can be formed by pressing, such as forging.

(f)於上述第1及第2實施形態中，表示第1齒32a、132a及第3齒42a、142a實質上形成為+形狀時之例，但本發明不限定於此。例如，該等第1齒32a及第3齒42a之至少一部分可為菱形、梯形狀、三角形狀、六角形狀、八角形狀等其他形狀。 (f) In the first and second embodiments described above, the first teeth 32a, 132a and the third teeth 42a, 142a are substantially formed in a + shape, but the present invention is not limited to this. For example, at least a part of the first teeth 32a and the third teeth 42a may have other shapes such as a rhombus, a trapezoid, a triangle, a hexagon, an octagon, and the like.

如圖10所示，第1齒332a及/或第3齒342a較佳為，自自行車用鏈 輪之徑向觀察時為八角形狀。於該情形時，可避免第1齒332a及/或第3齒342a與內鏈板2b之過度干涉，且藉由衝壓加工例如鍛造容易形成確實地保持外鏈板2a之齒形狀。 As shown in Figure 10, the first tooth 332a and/or the third tooth 342a is preferably a bicycle chain The wheel has an octagonal shape when viewed in the radial direction. In this case, excessive interference between the first tooth 332a and/or the third tooth 342a and the inner link plate 2b can be avoided, and it is easy to form the tooth shape that reliably maintains the outer link plate 2a by press processing such as forging.

此處，所謂八角形狀不限定於正八角形狀，若為具有八邊之形狀則可為任意之形狀。又，構成八角形之八邊不限定於直線，可為具有和緩曲率之曲線。 Here, the so-called octagonal shape is not limited to a regular octagonal shape, and any shape may be used as long as it has an octagonal shape. In addition, the eight sides constituting the octagon are not limited to straight lines, and may be curved lines with gentle curvature.

具體而言，如圖9及圖10所示，於第1齒332a及第3齒342a為上述八角形狀之情形時，第1齒332a及第3齒342a具有第1面352a、第2面352b、第3面352c、及傾斜部353。 Specifically, as shown in FIGS. 9 and 10, when the first tooth 332a and the third tooth 342a are in the above-mentioned octagonal shape, the first tooth 332a and the third tooth 342a have a first surface 352a and a second surface 352b. , The third surface 352c, and the inclined portion 353.

第1面352a為第1齒332a之第1鏈輪14之第1側面14a側之面、及第3齒342a之第2鏈輪16之第3側面16a側之面。 The first surface 352a is a surface on the first side surface 14a side of the first sprocket 14 of the first tooth 332a and a surface on the third side surface 16a side of the second sprocket 16 of the third tooth 342a.

第2面352b為第1齒332a之第1鏈輪14之第2側面14b側之面、及第3齒342a之第2鏈輪16之第4側面16b側之面。 The second surface 352b is a surface on the second side surface 14b side of the first sprocket 14 of the first tooth 332a and a surface on the fourth side surface 16b side of the second sprocket 16 of the third tooth 342a.

第3面352c於第1面352a及第2面352b之軸方向間於周方向延伸。第3面352c包含：驅動面352d、非驅動面352e、及將驅動面352d及非驅動面352e沿周方向連結之前端面352f。傾斜部353為用以避免與內鏈板2b之過度干涉者。傾斜部353具有：第1倒角面353a、第2倒角面353b、第3倒角面353c、及第4倒角面353d。 The third surface 352c extends in the circumferential direction between the axial directions of the first surface 352a and the second surface 352b. The third surface 352c includes a driving surface 352d, a non-driving surface 352e, and a front end surface 352f that connects the driving surface 352d and the non-driving surface 352e in the circumferential direction. The inclined portion 353 is used to avoid excessive interference with the inner link plate 2b. The inclined portion 353 has a first chamfered surface 353a, a second chamfered surface 353b, a third chamfered surface 353c, and a fourth chamfered surface 353d.

第1倒角面353a自第1面352a形成至驅動側之第3面352c。第2倒角面353b自第2面352b形成至驅動側之第3面352c。第3倒角面353c自第1面352a形成至非驅動側之第3面352c。第4倒角面353d自第2面352b形成至非驅動側之第3面352c。 The first chamfered surface 353a is formed from the first surface 352a to the third surface 352c on the driving side. The second chamfered surface 353b is formed from the second surface 352b to the third surface 352c on the driving side. The third chamfered surface 353c is formed from the first surface 352a to the third surface 352c on the non-driving side. The fourth chamfered surface 353d is formed from the second surface 352b to the third surface 352c on the non-driving side.

換言之，第1倒角面353a形成於藉由第1面352a及驅動側之第3面352c構成之角隅部。第2倒角面353b形成於藉由第2面352b及驅動側之第3面352c構成之角隅部。第3倒角面353c形成於藉由第1面352a及非驅動側之第3面352c構成之角隅部。第4倒角面353d形成於藉由第2面 352b及非驅動側之第3面352c構成之角隅部。 In other words, the first chamfered surface 353a is formed at a corner formed by the first surface 352a and the third surface 352c on the driving side. The second chamfered surface 353b is formed at a corner formed by the second surface 352b and the third surface 352c on the driving side. The third chamfered surface 353c is formed at a corner formed by the first surface 352a and the third surface 352c on the non-driving side. The fourth chamfered surface 353d is formed by the second surface A corner formed by 352b and the third surface 352c on the non-driving side.

此處，由於第1齒332a及第3齒342a之驅動側與非驅動側相比更有與內鏈板2b過度干涉之傾向，故形成於驅動側之第1倒角面353a及第2倒角面353b較佳為具有大於形成於非驅動側之第3倒角面353c及第4倒角面353d之面積。 Here, since the driving side of the first tooth 332a and the third tooth 342a has a tendency to excessively interfere with the inner link plate 2b than the non-driving side, the first chamfered surface 353a and the second chamfer formed on the driving side The corner surface 353b preferably has an area larger than the third chamfered surface 353c and the fourth chamfered surface 353d formed on the non-driving side.

藉由第1至第4倒角面353a、353b、353c、353d，可避免第1齒332a及第3齒342a與內鏈板2b之過度干涉。又，第1至第4倒角面353a、353b、353c、353d與上述第1及第2實施形態之凹部形狀不同，為以直線或和緩之曲線構成之傾斜面，故容易藉由衝壓加工例如鍛造而形成。 With the first to fourth chamfered surfaces 353a, 353b, 353c, and 353d, excessive interference between the first tooth 332a and the third tooth 342a and the inner link plate 2b can be avoided. In addition, the first to fourth chamfered surfaces 353a, 353b, 353c, and 353d are different in shape from the recessed portions of the first and second embodiments. They are inclined surfaces formed with straight lines or gentle curves, so they can be easily processed by pressing, for example Forged and formed.

又，於第1齒332a及第3齒342a具有八角形狀之情形時，第1齒332a及第3齒342a之驅動面接觸於鏈條輥2c之第1軸方向接觸寬度L3較佳為實質上形成為與第2齒332b及第4齒342b之驅動面接觸於鏈條輥2c之第2軸方向接觸寬度L4相同之長度。 Moreover, when the first tooth 332a and the third tooth 342a have an octagonal shape, the contact width L3 in the first axial direction of the first tooth 332a and the third tooth 342a in contact with the chain roller 2c is preferably substantially formed This is the same length as the contact width L4 in the second axial direction where the driving surfaces of the second tooth 332b and the fourth tooth 342b are in contact with the chain roller 2c.

(g)於上述第1及第2實施形態中，表示第1齒32a、132a實質上形成為T字狀時之例，但本發明不限定於此。例如，該第1齒32a之一部分可為菱形狀、梯形狀、三角形狀、六角形狀、八角形狀等其他形狀。 (g) In the above-mentioned first and second embodiments, an example in which the first teeth 32a and 132a are substantially formed in a T-shape is shown, but the present invention is not limited to this. For example, a part of the first tooth 32a may have other shapes such as a diamond shape, a trapezoidal shape, a triangular shape, a hexagonal shape, and an octagonal shape.

(h)於上述第1及第2實施形態中，第1變速區域34具有第2突起36b，但亦可不設置第2突起36b。 (h) In the first and second embodiments described above, the first shift region 34 has the second protrusion 36b, but the second protrusion 36b may not be provided.

(i)於上述第1及第2實施形態中，將複數個鏈輪安裝臂24之數量設為4個，但鏈輪安裝臂之數量不限定於4個。 (i) In the first and second embodiments described above, the number of the plurality of sprocket mounting arms 24 is set to four, but the number of sprocket mounting arms is not limited to four.

(j)於上述第1及第2實施形態中，於各第1鏈輪14及第2鏈輪16之第1變速區域34及第2變速區域44，可包含-(減號)形狀之第2齒32b及第4齒42b。 (j) In the above-mentioned first and second embodiments, the first speed change area 34 and the second speed change area 44 of each of the first sprocket 14 and the second sprocket 16 may include a-(minus) shape Two teeth 32b and fourth teeth 42b.

(k)於上述第2實施形態中，表示第1齒32a之追加部為金屬製時之 例，但追加部亦可為非金屬製。例如，於追加部為非金屬製之情形時，該追加部係藉由接著或一體成型而安裝於第1齒。於該情形時，可減輕踏板中因鏈條與鏈輪之齒接觸引起之雜訊。 (k) In the above-mentioned second embodiment, when the additional part of the first tooth 32a is made of metal For example, but the additional part may be made of non-metal. For example, when the additional part is made of non-metal, the additional part is attached to the first tooth by bonding or integral molding. In this case, the noise caused by the contact between the chain and the teeth of the sprocket in the pedal can be reduced.

(l)本發明之自行車用鏈輪之第1齒32a、132a及第2齒32b、132b中之至少一者較佳為具有鍍敷層。 (1) At least one of the first teeth 32a, 132a and the second teeth 32b, 132b of the bicycle sprocket of the present invention preferably has a plating layer.

例如，於第1齒32a、132a及第2齒32b、132b為鋁製之情形時，鍍敷層基於耐磨耗性之目的，較佳為鍍鎳層。又，於第1齒32a、132a及第2齒32b、132b為鐵製之情形時，鍍敷層基於防鏽性之目的，較佳為鍍鎳鉻層。 For example, when the first teeth 32a, 132a and the second teeth 32b, 132b are made of aluminum, the plating layer is preferably a nickel plating layer for the purpose of wear resistance. In addition, when the first teeth 32a, 132a and the second teeth 32b, 132b are made of iron, the plating layer is preferably a nickel-chromium plating layer for the purpose of rust resistance.

另，於第1齒32a、132a及第2齒32b、132b為鐵製之情形時，第1齒32a、132a及第2齒32b、132b基於防鏽性及著色之目的，較佳為具有電泳塗漆層。 In addition, when the first teeth 32a, 132a and the second teeth 32b, 132b are made of iron, the first teeth 32a, 132a and the second teeth 32b, 132b preferably have electrophoresis for the purpose of rust resistance and coloring. Painted layer.

(m)於上述第1及第2實施形態中，表示第1鏈輪14由合成樹脂製之第1鏈輪本體30、金屬製之第1環狀部31及第1齒部32b構成時之例。 (m) In the first and second embodiments described above, the first sprocket 14 is composed of the first sprocket body 30 made of synthetic resin, the first ring portion 31 made of metal, and the first tooth portion 32b. example.

可代替此，由金屬構成第1鏈輪14，且一體成型第1鏈輪本體30、第1環狀部31、及第1齒部32b。於該情形時，第1鏈輪本體30、第1環狀部31、及第1齒部32b由金屬例如鋁、鈦、或鐵．不鏽鋼等構成。 Instead of this, the first sprocket 14 may be made of metal, and the first sprocket body 30, the first annular portion 31, and the first tooth portion 32b may be integrally molded. In this case, the first sprocket body 30, the first ring portion 31, and the first tooth portion 32b are made of metal such as aluminum, titanium, or iron. Made of stainless steel.

將如此構成之第1鏈輪314之一例表示於圖11。圖11為與上述第1及第2實施形態實質上相同之構成，關於代表性之構成，標註與上述第1實施形態相同之符號。 An example of the first sprocket 314 configured in this manner is shown in FIG. 11. Fig. 11 shows a configuration that is substantially the same as that of the above-mentioned first and second embodiments, and representative configurations are denoted by the same reference numerals as those of the above-mentioned first embodiment.

(n)可代替上述第1及第2實施形態之第1鏈輪14、114，而如圖12A及圖12B所示構成第1鏈輪214。另，於圖12A及圖12B中，關於與上述第1及第2實施形態實質上相同之構成，使用上述第1實施形態之符號進行表現。 (n) Instead of the first sprockets 14 and 114 of the first and second embodiments described above, the first sprocket 214 can be configured as shown in FIGS. 12A and 12B. In addition, in FIG. 12A and FIG. 12B, about the structure which is substantially the same as that of the said 1st and 2nd embodiment, the code|symbol of the said 1st embodiment is used for expression.

於第1鏈輪214中，將第1貫通孔130a設置於第1鏈輪本體30。又，將第2貫通孔130b設置於第1環狀部31。於第1貫通孔130a，配置有環 構件130c例如墊圈。具體而言，以環構件130c之內周面與第2貫通孔130b之內周面實質上成為同一面之方式，第1鏈輪本體30與第1環狀部31及環構件130c一體成型。 In the first sprocket 214, the first through hole 130 a is provided in the first sprocket body 30. In addition, the second through hole 130 b is provided in the first annular portion 31. In the first through hole 130a, a ring is arranged The member 130c is, for example, a gasket. Specifically, the first sprocket body 30, the first annular portion 31 and the ring member 130c are integrally molded so that the inner peripheral surface of the ring member 130c and the inner peripheral surface of the second through hole 130b are substantially the same surface.

當如此構成第1鏈輪214時，第1固定螺栓26插通於各環構件130c、各第2貫通孔130b、及各第1安裝部24a，且螺合於螺母構件(未圖示)。藉此，將第1鏈輪本體30固定於鏈輪安裝臂24。 When the first sprocket 214 is configured in this way, the first fixing bolt 26 is inserted through each ring member 130c, each second through hole 130b, and each first attachment portion 24a, and is screwed to a nut member (not shown). Thereby, the first sprocket body 30 is fixed to the sprocket attachment arm 24.

(o)於上述第1及第2實施形態中，表示第1鏈輪14之第2齒32b與第1凹部32e一同藉由衝壓加工例如鍛造形成時之例。亦可代替此，如圖13A~13D所示，第2齒32b藉由衝壓加工(例如鍛造)及切削步驟形成。另，圖13A~13D係為了容易說明而示意性地表現各步驟。 (o) In the first and second embodiments described above, an example is shown when the second teeth 32b of the first sprocket 14 and the first recesses 32e are formed by press working, such as forging. Instead of this, as shown in FIGS. 13A to 13D, the second teeth 32b are formed by pressing (for example, forging) and cutting steps. In addition, FIGS. 13A to 13D schematically represent each step for ease of description.

於該情形時，第2齒32b由第1衝壓步驟(參照圖13B)、第1衝壓步驟後之切削步驟(參照圖13C)、及切削步驟後之第2衝壓步驟(參照圖13D)形成。 In this case, the second teeth 32b are formed by the first punching step (refer to FIG. 13B), the cutting step after the first punching step (refer to FIG. 13C), and the second punching step after the cutting step (refer to FIG. 13D).

第2齒32b如圖13D所示，具有第5面52a(第1面之一例)、與第6面52b(第一面之一例)。例如，第5面52a形成於第2齒32a之第1鏈輪14之第1側面14a(參照圖2)側。第6面52b為與旋轉中心軸芯X平行之軸方向上之、與第5面52a相反側之面。例如，第6面52b形成於第2齒32b之第1鏈輪14之第2側面14b(參照圖4)側。 As shown in FIG. 13D, the second tooth 32b has a fifth surface 52a (an example of the first surface) and a sixth surface 52b (an example of the first surface). For example, the 5th surface 52a is formed in the 1st side surface 14a (refer FIG. 2) side of the 1st sprocket 14 of the 2nd tooth 32a. The sixth surface 52b is a surface on the opposite side to the fifth surface 52a in the axial direction parallel to the rotation center axis X. For example, the sixth surface 52b is formed on the second side surface 14b (refer to FIG. 4) side of the first sprocket 14 of the second teeth 32b.

具體而言，如圖13A所示，於初期狀態中，第2齒部32b之構成第5面52a之面(後述之第1按壓部152a)及構成第6面52b之面(後述之第2按壓部152c)實質上形成於與第1鏈輪14之第1環狀部31之外面同一面上。 Specifically, as shown in FIG. 13A, in the initial state, the surface of the second tooth portion 32b that constitutes the fifth surface 52a (the first pressing portion 152a described later) and the surface that constitutes the sixth surface 52b (the second surface 52b described later) The pressing portion 152c) is formed substantially on the same surface as the outer surface of the first annular portion 31 of the first sprocket 14.

第1衝壓步驟為衝壓第2齒32b之第5面52a側之步驟。如圖13B所示，於第1衝壓步驟中，於第1環狀部31被固定之狀態下，藉由按壓裝置(未圖示)之按壓構件A對第2齒32b之第5面52a側衝壓。 The first pressing step is a step of pressing the fifth surface 52a side of the second tooth 32b. As shown in FIG. 13B, in the first pressing step, in the state where the first annular portion 31 is fixed, the pressing member A of the pressing device (not shown) faces the fifth surface 52a side of the second tooth 32b. stamping.

此處，按壓構件A按壓之第1按壓部152a為形成有第2齒32b及第1 凹部32e之部分。如此，當按壓構件A按壓第1按壓部152a時，形成有第2齒部32b之第5面52a，且第6面52b側之實質上位於與第1按壓部152a相反側之部分突出。於以下，將該部分記載為突出部152b。 Here, the first pressing portion 152a pressed by the pressing member A is formed with the second teeth 32b and the first Part of the recess 32e. In this way, when the pressing member A presses the first pressing portion 152a, the fifth surface 52a of the second tooth portion 32b is formed, and the portion on the side of the sixth surface 52b substantially on the opposite side to the first pressing portion 152a protrudes. Hereinafter, this part is referred to as the protrusion 152b.

切削步驟為切削第2齒32b之第6面52b側之、藉由第1衝壓步驟於軸方向突出之突出部152b之步驟。如圖13C所示，於切削步驟中，形成於第6面52b側之突出部152b藉由切削裝置B被切削。詳細而言，以切削突出部152b後之面與第1環狀部31之外面實質上成為同一面之方式，藉由切削裝置B切削。 The cutting step is a step of cutting the protrusion 152b on the side of the sixth surface 52b of the second tooth 32b that protrudes in the axial direction by the first punching step. As shown in FIG. 13C, the protrusion 152b formed on the side of the sixth surface 52b is cut by the cutting device B in the cutting step. Specifically, the cutting device B cuts the surface after the cutting protrusion 152b and the outer surface of the first annular portion 31 are substantially the same surface.

第2衝壓步驟為衝壓第2齒32b之第6面52b側之步驟。如圖13D所示，於第2衝壓步驟中，於使用以形成第2齒32b外形之模型框D抵接與第1按壓部152a之狀態下，藉由按壓裝置之按壓構件C衝壓第2齒32b之第6面52b側。 The second pressing step is a step of pressing the sixth surface 52b side of the second tooth 32b. As shown in FIG. 13D, in the second pressing step, the second tooth is punched by the pressing member C of the pressing device in a state where the model frame D used to form the outer shape of the second tooth 32b is in contact with the first pressing portion 152a. The 6th surface of 32b is on the 52b side.

此處，按壓構件C按壓之第2按壓部152c為形成有第2齒32b及第1凹部32e之部分。如此，當按壓構件C按壓第2按壓部152c時，形成第2齒部32b之第6面52b。又，形成包含第5面52a及第6面52b之第2齒部32b之齒尖52c。 Here, the second pressing portion 152c pressed by the pressing member C is a portion where the second teeth 32b and the first recess 32e are formed. In this way, when the pressing member C presses the second pressing portion 152c, the sixth surface 52b of the second tooth portion 32b is formed. In addition, a tooth tip 52c including the second tooth portion 32b of the fifth surface 52a and the sixth surface 52b is formed.

如上所述，藉由使用第1衝壓步驟、切削步驟、及第2衝壓步驟，可形成第2齒32b。另，於如上所述般形成第2齒32b後，可選擇性追加用以修整第2齒32b形狀之研磨步驟、及提高第2齒32b耐磨耗性之鍍敷步驟(較佳為鍍鎳步驟)。 As described above, by using the first punching step, the cutting step, and the second punching step, the second teeth 32b can be formed. In addition, after forming the second teeth 32b as described above, a grinding step for trimming the shape of the second teeth 32b and a plating step (preferably nickel plating) to improve the wear resistance of the second teeth 32b can be optionally added. step).

此處，表示藉由衝壓加工及切削步驟形成第2齒32b時之例，但第2鏈輪16之第4齒42b亦可同樣地形成。 Here, an example in the case of forming the second teeth 32b by the press working and cutting steps is shown, but the fourth teeth 42b of the second sprocket 16 may be formed in the same manner.

(p)於上述第1及第2實施形態、與上述其他實施形態中，例示前鏈輪14、16作為自行車用鏈輪，但本發明不限定於此。本發明亦可應用於後鏈輪。 (p) In the first and second embodiments described above and the other embodiments described above, the front sprockets 14 and 16 are exemplified as bicycle sprockets, but the present invention is not limited to this. The present invention can also be applied to the rear sprocket.

[產業上之可利用性] [Industrial availability]

可廣泛應用於自行車用鏈輪及自行車用鏈輪總成。 It can be widely used in bicycle sprocket and bicycle sprocket assembly.

2‧‧‧鏈條 2‧‧‧Chain

2a‧‧‧外鏈板 2a‧‧‧Outer chain plate

2b‧‧‧內鏈板 2b‧‧‧Inner chain plate

2c‧‧‧鏈條輥 2c‧‧‧Chain roller

14‧‧‧第1鏈輪 14‧‧‧1st sprocket

16‧‧‧第2鏈輪 16‧‧‧Second sprocket

32‧‧‧齒 32‧‧‧tooth

32a‧‧‧第1齒 32a‧‧‧first tooth

32b‧‧‧第2齒 32b‧‧‧2nd tooth

42‧‧‧齒 42‧‧‧tooth

42a‧‧‧第3齒 42a‧‧‧3rd tooth

42b‧‧‧第4齒 42b‧‧‧4th tooth

42e‧‧‧第2凹部 42e‧‧‧Second recess

L1‧‧‧第1軸方向間隔 L1‧‧‧1st axis direction interval

L2‧‧‧第2軸方向間隔 L2‧‧‧Second axis direction interval

W1‧‧‧第1最大軸方向寬度 W1‧‧‧The first largest axis width

W2‧‧‧第2最大軸方向寬度 W2‧‧‧The second largest axis width

W3‧‧‧第3最大軸方向寬度 W3‧‧‧The 3rd largest axis width

W4‧‧‧第4最大軸方向寬度 W4‧‧‧The 4th largest axis width

Claims (22)

一種自行車用鏈輪，其包含旋轉中心軸心，且具備：第1齒，其具有第1軸方向鏈條扣合寬度，該第1軸方向鏈條扣合寬度小於自行車用鏈條外鏈之第1軸方向間隔，且大於連結於上述外鏈之內鏈之第2軸方向間隔，上述第1齒具有用以避免與上述內鏈過度干涉之凹部；與第2齒，其具有小於上述第2軸方向間隔之第2軸方向鏈條扣合寬度；且上述凹部及上述第2齒係藉由衝壓加工一構成上述凹部及上述第2齒之基底材料而共同形成，上述第2齒係藉由第1衝壓步驟、上述第1衝壓步驟後之切削步驟、及上述切削步驟後之第2衝壓步驟形成。 A bicycle sprocket, which includes a rotation center axis, and is provided with: a first tooth having a chain buckling width in the first axis direction, and the chain buckling width in the first axis direction is smaller than the first axis of the outer chain of the bicycle chain The directional interval is greater than the second axial interval of the inner chain connected to the outer chain, the first tooth has a recess to avoid excessive interference with the inner chain; and the second tooth has a smaller axial direction than the second The width of the chain in the second axis direction of the interval; and the concave portion and the second tooth system are formed together by pressing a base material that constitutes the concave portion and the second tooth, and the second tooth system is formed by the first punching Step, the cutting step after the first punching step, and the second punching step after the cutting step. 如請求項1之自行車用鏈輪，其中上述第1齒具有用以避免與上述內鏈過度干涉之凹部，且上述凹部係藉由切削加工形成。 The bicycle sprocket according to claim 1, wherein the first tooth has a recess for avoiding excessive interference with the inner chain, and the recess is formed by cutting. 如請求項1之自行車用鏈輪，其中上述第1齒具有：本體部、與為了擴寬上述本體部之寬度而安裝於上述本體部之追加部，且上述第1軸方向鏈條扣合寬度為藉由將上述追加部安裝於上述本體部而獲得之寬度。 The bicycle sprocket according to claim 1, wherein the first tooth has a main body, and an additional part attached to the main body in order to widen the width of the main body, and the engagement width of the chain in the first axis direction is The width obtained by attaching the additional part to the main body part. 如請求項3之自行車用鏈輪，其中上述追加部為金屬製，並藉由接著、擴散接合、鉚合、或鑄造安裝於上述第1齒。 Such as the bicycle sprocket of claim 3, wherein the additional part is made of metal and is attached to the first tooth by bonding, diffusion bonding, riveting, or casting. 如請求項3之自行車用鏈輪，其中上述追加部為非金屬製，並藉由接著或一體成型而安裝於上 述第1齒。 Such as the bicycle sprocket of claim 3, wherein the above-mentioned additional part is made of non-metal, and is installed on it by bonding or integral molding The first tooth. 如請求項1之自行車用鏈輪，其中上述第1齒及上述第2齒各者均具有驅動面，上述驅動面包含鏈條輥接觸之接觸點，且於上述驅動面，形成有較上述接觸點於徑向外側、於周方向延伸之驅動面延伸部。 For example, the bicycle sprocket of claim 1, wherein each of the first tooth and the second tooth has a driving surface, the driving surface includes a contact point where the chain roller contacts, and the driving surface is formed with a higher contact point than the aforementioned contact point. An extension of the driving surface extending in the circumferential direction on the outside in the radial direction. 如請求項6之自行車用鏈輪，其中上述第1齒及上述第2齒各者進而具有非驅動面，於上述非驅動面，形成有為了抑制鏈條輥向徑向外側之移動而於周方向延伸之非驅動面延伸部。 The bicycle sprocket according to claim 6, wherein each of the first tooth and the second tooth further has a non-driving surface, and the non-driving surface is formed in the circumferential direction in order to suppress the radially outward movement of the chain roller. The extended non-driving surface extension. 如請求項1之自行車用鏈輪，其中上述第1齒及上述第2齒分別具有驅動面、與非驅動面，上述驅動面包含鏈條輥接觸之接觸點，於上述驅動面，形成有較上述接觸點於徑向外側、於周方向延伸之驅動面延伸部，於上述非驅動面，形成有為了抑制鏈條輥向徑向外側之移動而於周方向延伸之非驅動面延伸部。 For example, the bicycle sprocket of claim 1, wherein the first tooth and the second tooth respectively have a driving surface and a non-driving surface, and the driving surface includes the contact point of the chain roller, and the driving surface is formed on the driving surface. The contact point is radially outward and extends in the circumferential direction of the driving surface extension. On the non-driving surface, a non-driving surface extension extending in the circumferential direction is formed in order to suppress the movement of the chain roller to the radially outer side. 如請求項1之自行車用鏈輪，其中進而具備：變速區域，其係用以於變速時使上述鏈條變速。 For example, the bicycle sprocket of claim 1, which is further provided with: a shifting area, which is used to shift the above-mentioned chain during shifting. 如請求項1之自行車用鏈輪，其中進而具備：金屬製之環狀部，其外周設置有上述第1齒及上述第2齒；與非金屬製之本體部，其安裝於上述環狀部之內周。 The bicycle sprocket according to claim 1, which is further provided with: a metal ring portion, the outer periphery of which is provided with the first tooth and the second tooth; and a non-metal body portion, which is mounted on the ring portion Within the week. 如請求項1之自行車用鏈輪，其中上述衝壓加工為鍛造。 Such as the bicycle sprocket of claim 1, wherein the above-mentioned stamping process is forging. 如請求項1之自行車用鏈輪，其中上述第2齒係藉由衝壓加工及切削步驟形成。 The bicycle sprocket according to claim 1, wherein the second tooth system is formed by pressing and cutting steps. 如請求項1之自行車用鏈輪，其中上述第2齒具有第1面、及在與上述旋轉中心軸心平行之軸方向上位於上述第1面相反側之第2面，上述第1衝壓步驟為衝壓上述第2齒之上述第1面側之步驟，上述第2衝壓步驟為衝壓上述第2齒之上述第2面側之步驟。 According to the bicycle sprocket of claim 1, wherein the second tooth has a first surface and a second surface located on the opposite side of the first surface in the axial direction parallel to the rotation center axis, the first pressing step This is a step of punching the first surface side of the second tooth, and the second punching step is a step of punching the second surface side of the second tooth. 如請求項13之自行車用鏈輪，其中上述切削步驟為切削上述第2齒之上述第2面側中藉由上述第1衝壓步驟於上述軸方向突出之突出部之步驟。 The bicycle sprocket according to claim 13, wherein the cutting step is a step of cutting a protrusion on the second surface side of the second tooth that protrudes in the axial direction by the first punching step. 一種自行車用鏈輪，其包含旋轉中心軸心，且具備：第1齒，其具有第1軸方向鏈條扣合寬度，該第1軸方向鏈條扣合寬度小於自行車用鏈條外鏈之第1軸方向間隔，且大於連結於上述外鏈之內鏈之第2軸方向間隔，上述第1齒具有用以避免與上述內鏈過度干涉之凹部；與第2齒，其具有小於上述第2軸方向間隔之第2軸方向鏈條扣合寬度；且上述凹部及上述第2齒係藉由衝壓加工一構成上述凹部及上述第2齒之基底材料而共同形成，其中，上述第1齒及上述第2齒各者均具有驅動面，上述驅動面包含鏈條輥接觸之接觸點，且於上述驅動面，形成有較上述接觸點於徑向外側、於周方向延伸之驅動面延伸部。 A bicycle sprocket, which includes a rotation center axis, and is provided with: a first tooth having a chain buckling width in the first axis direction, and the chain buckling width in the first axis direction is smaller than the first axis of the outer chain of the bicycle chain The directional interval is greater than the second axial interval of the inner chain connected to the outer chain, the first tooth has a recess to avoid excessive interference with the inner chain; and the second tooth has a smaller axial direction than the second The second axis direction chain engagement width of the interval; and the concave portion and the second tooth system are jointly formed by pressing a base material that constitutes the concave portion and the second tooth, wherein the first tooth and the second tooth Each of the teeth has a driving surface, and the driving surface includes a contact point where the chain roller contacts, and the driving surface is formed with a driving surface extension that extends radially outward and in a circumferential direction from the contact point. 一種自行車用鏈輪，其包含旋轉中心軸心，且具備：第1齒，其具有第1軸方向鏈條扣合寬度，該第1軸方向鏈條扣合寬度小於自行車用鏈條外鏈之第1軸方向間隔，且大於連結於上述外鏈之內鏈之第2軸方向間隔，上述第1齒具有用以避免與上述內鏈過度干涉之凹部；與第2齒，其具有小於上述第2軸方向間隔之第2軸方向鏈條扣合 寬度，其中，上述凹部及上述第2齒係藉由衝壓加工一構成上述凹部及上述第2齒之基底材料而共同形成，上述第1齒及上述第2齒分別具有驅動面、與非驅動面，上述驅動面包含鏈條輥接觸之接觸點，於上述驅動面，形成有較上述接觸點於徑向外側、於周方向延伸之驅動面延伸部，於上述非驅動面，形成有為了抑制鏈條輥向徑向外側之移動而於周方向延伸之非驅動面延伸部。 A bicycle sprocket, which includes a rotation center axis, and is provided with: a first tooth having a first axis direction chain buckling width, the first axis direction chain buckling width is smaller than the first axis of the bicycle chain outer chain The directional interval is greater than the second axis interval of the inner chain connected to the outer chain. The first tooth has a recess to avoid excessive interference with the inner chain; and the second tooth has a smaller axial direction than the second tooth. Interval 2nd axis direction chain buckle Width, wherein the concave portion and the second tooth system are formed together by pressing a base material constituting the concave portion and the second tooth, and the first tooth and the second tooth have a driving surface and a non-driving surface, respectively The driving surface includes a contact point where the chain roller contacts. On the driving surface, a driving surface extension that extends radially outward and in the circumferential direction from the contact point is formed, and the non-driving surface is formed to restrain the chain roller. The non-driving surface extension part that moves to the radially outer side and extends in the circumferential direction. 一種自行車用鏈輪總成，其具備：如請求項1至16中任一項之自行車用鏈輪。 A bicycle sprocket assembly, which is provided with the bicycle sprocket according to any one of claims 1 to 16. 如請求項17之自行車用鏈輪總成，其中上述鏈輪為1個前鏈輪。 For example, the bicycle sprocket assembly of claim 17, wherein the above-mentioned sprocket is a front sprocket. 如請求項18之自行車用鏈輪總成，其中上述鏈輪可沿著旋轉中心軸心移動。 For example, the bicycle sprocket assembly of claim 18, wherein the sprocket can move along the central axis of rotation. 如請求項17之自行車用鏈輪總成，其中上述鏈輪為複數個前鏈輪。 For example, the bicycle sprocket assembly of claim 17, wherein the above-mentioned sprocket is a plurality of front sprocket. 如請求項20之自行車用鏈輪總成，其中上述鏈輪可沿著旋轉中心軸心移動。 For example, the bicycle sprocket assembly of claim 20, wherein the sprocket can move along the central axis of rotation. 如請求項17之自行車用鏈輪總成，其中上述鏈輪為後鏈輪。 For example, the bicycle sprocket assembly of claim 17, wherein the above-mentioned sprocket is a rear sprocket.

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