WO2019100529A1 - 一种辐板与筒体刚性连接的变速链轮结构 - Google Patents

一种辐板与筒体刚性连接的变速链轮结构 Download PDF

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Publication number
WO2019100529A1
WO2019100529A1 PCT/CN2017/119927 CN2017119927W WO2019100529A1 WO 2019100529 A1 WO2019100529 A1 WO 2019100529A1 CN 2017119927 W CN2017119927 W CN 2017119927W WO 2019100529 A1 WO2019100529 A1 WO 2019100529A1
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cylinder
web
weight reducing
sprocket structure
structure according
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PCT/CN2017/119927
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English (en)
French (fr)
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郑潇然
郑英
谢涛
申桂林
黄尧尧
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湖南耐特材料科技有限公司
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Publication of WO2019100529A1 publication Critical patent/WO2019100529A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
    • B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
    • B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
    • B62M9/10—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like

Definitions

  • the present invention relates to a shifting member for a bicycle, and more particularly to a shifting sprocket for an exercise bicycle which is light in weight, high in specific rigidity and specific strength.
  • the shifting sprocket of the bicycle is a structural wheel set in which a plurality of different diameter ring gears are arranged in parallel.
  • a shifting sprocket formed by stacking the punching ring gears by riveting represented by SHIMANO
  • the other is a one-piece sprocket (represented by SRAM) in which a plurality of tapered rings (or tower-shaped) hollow bodies are used as supports for a plurality of different diameter ring gears disposed in parallel with their outer circumferences.
  • the former product stamping ring gear is formed by riveting and stacking together to form a shifting sprocket.
  • SHIMANO's M9000 series with carbon fiber As the support structure has a limited specific stiffness and a quality of more than 350g. Its appearance is usually cumbersome.
  • the processing technology is good; the latter is a tapered (or tower-shaped) hollow body structure, and is usually processed from a single piece of material, thus having high strength and rigidity, but in the existing structural design, There is a rod-shaped bridge between any two adjacent ring gears, and the bridge portion is substantially a cantilever structure composed of a rod-shaped rib.
  • a hollow cone-integrated sprocket based on the patent of SRAM (ZL 200910004713.4), the sprocket realizes the multi-piece tooth integrated processing, or the other multi-ring teeth are integrally processed and assembled with the largest ring teeth, thus
  • the better specific strength and specific stiffness of the shifting sprocket formed by the rucking and stacking of the punched ring gear are obtained, especially the lighter total mass is obtained, and the hollow visual effect is obtained, and the appearance is beautiful.
  • the structure has a structural strength that is not high enough and the rigidity is limited.
  • the specific strength and specific stiffness need to be improved because the structure has a ring gear in order to obtain a lighter weight.
  • the bridge portion has an L-shaped arm shape, which is mainly torsionally resistant in use, and the structure is actually mechanically It is a cantilever, and its torsional modulus is very low, so it is less rigid and is not suitable for working under heavy load. In addition, its rigidity is not enough and it will affect the smoothness of its shifting. This structure emphasizes weight loss and neglects strength and stiffness. Therefore, its strength and stiffness are limited, which affects its specific strength and specific stiffness. It needs to be further enhanced in many applications.
  • the invention solves the technical problem that the existing bicycle shifting sprocket has low strength and rigidity, and can not meet the heavy load operation of the sports bicycle, and proposes a bicycle spoke with light weight, high strength and rigidity, and satisfying the heavy load of the sports bicycle.
  • the invention provides a shifting sprocket structure rigidly connected to a web and a cylindrical body, comprising: two adjacent webs of different diameters, and a ring gear disposed on the outer circumference of the web.
  • the two webs are connected by a ring-shaped cylinder to be rigidly integrated, and the webs are provided with web weight-reducing holes along the circumferential direction thereof, and the cylinder body is provided with a cylinder weight-reducing along the circumferential direction thereof. hole.
  • the cylinder is a cylinder or a truncated cone.
  • the axial width of the cylinder weight reducing hole is smaller than the width between the two webs.
  • the lower edge of the web is provided with an annular reinforcing rib.
  • the lower edge of the web is provided with a weight reducing groove.
  • the web weight reducing hole and the cylinder weight reducing hole are holes of different diameters, and the spacing of the two adjacent holes is the same or different.
  • the web weight reducing hole and the cylinder weight reducing hole are at least one of a circular hole, a rectangular hole and a waist hole, and the weight reducing holes of various shapes and sizes are arranged in any combination.
  • the wall thickness of the web and the cylinder are both 0.5 to 2.5 mm.
  • the inner surface of the ring gear is offset from the inner surface of the web by 0.1 to 1 mm.
  • the web, the ring gear and the barrel are integrally processed.
  • the web and the cylinder of the invention substantially retain the structure of the integral annular plate or the annular cylinder after the weight reducing hole is opened, and the holes between the weight reducing hole and the cylinder are independent, and there is no communication;
  • the ribs between the heavy holes and the webs of the smaller ring gear are randomly connected, and do not need to be connected to the center of the teeth;
  • the axial width of the cylinder weight reducing holes is smaller than the width between the two webs, basically The integrity of the cylinder is maintained, and the connecting member between the two webs is prevented from being a stress-relieving structure of the "cantilever beam", so that the sprocket structure has high strength and rigidity, so that the bearing capacity is stronger and the rigidity is
  • the increase in the degree of the first degree further ensures the smoothness of the sprocket shifting transmission.
  • the reasonable distribution and opening of the lightening and weight reducing grooves can make the shifting sprocket have lighter weight, and all the weight reducing holes and the weight reducing grooves are opened. Conducive to the discharge of the sprocket when working mud.
  • the web, the cylinder and the ring gear form a whole body and are automatically processed from the same piece of integral material, so that the shifting sprocket has good rigidity and high shape and dimensional precision, which is greatly beneficial to the use of the sports bicycle.
  • the invention has the advantages of simple structure, convenient processing, low cost and convenient promotion and application.
  • Figure 1 is a schematic cross-sectional view showing a preferred embodiment of the present invention
  • Figure 2 is a partial perspective view of the back of the shifting sprocket
  • Figure 3 is a partial perspective view of the front side of the shifting sprocket
  • Figure 4 is a partial perspective view showing the back of the shifting sprocket of another structure
  • the shifting sprocket structure rigidly connected to the web and the rib is composed of two adjacent ones, one small and one small different diameter.
  • the web 1 is provided on the outer ring 4 of the web.
  • the adjacent two webs 1 are connected by a ring-shaped cylinder 2 to be rigidly integrated, and the webs 1 are provided with web weight-reducing holes 3 along their circumferential intervals.
  • the cylinder 2 is provided with a cylinder weight reducing hole 5 along its circumferential direction, and between the adjacent cylinder weight reducing holes 5 is a tubular rib 6.
  • the cylindrical body 2 may be a cylindrical body or a truncated cone body.
  • the lower edge of the web 1 may be provided with an annular bead 7 (shown in Figure 1) to further enhance the strength and stiffness of the web.
  • the axial width a of the cylinder weight reducing hole 5 is smaller than the width b between the two webs 1, and the basic integrity of the cylinder 2 can be maintained to ensure the rigidity and strength of the cylinder 2 connecting the two adjacent webs 1.
  • the lower edge of the web 1 is provided with a weight reducing groove 8, which may have various shapes such as a circular arc shape, a wave shape or the like. Under the premise of ensuring higher strength and rigidity, the weight reducing groove 8 can be deeper in the radial direction of the web 1 to achieve further weight reduction.
  • the size of the web weight reducing hole 3 and the barrel weight reducing hole 5 may be equal or unequal holes, and the hole distances of the adjacent two holes may be the same or different.
  • the weight reducing holes may be various types of holes, for example, at least one of a round hole, a rectangular hole, and a waist hole.
  • various shapes and sizes of weight reducing holes 3, 5 can be arranged in any combination.
  • the size and distribution of the lightening or weight reducing grooves will be determined according to the size of the web or the cylinder, and may be evenly distributed or arbitrarily distributed.
  • the web 1 is a one-piece annular plate-like member, and its thickness is 0.5 to 2.5 mm as required, and the wall thickness of the cylinder 2 is 0.5 to 2.5 mm.
  • the inner surface of the ring gear 4 is offset from the inner surface of the web 1 to which it is attached by a distance M of 0.1 to 1 mm for ease of processing.
  • the web 1, the ring gear 4 and the barrel 2 are machined from a single piece of material.
  • variable sprocket of the bicycle is generally formed by the ribs connecting two adjacent ones, one large and one small two parallel webs 1 , and the webs and the ribs are alternately arranged.
  • a multi-stage stepped tower (or tapered) integral cylindrical member the transmission sprocket is radially disposed on the tower (or tapered) integral cylindrical member. Any two adjacent ring gears 4 can be connected to the cylinder 2 through the web 1 to form an adjacent two-stage ring gear of the sprocket.
  • the conventional "cantilever beam" connecting structure is improved.
  • the web of the present invention is an integral plate-like structure, and the web weight reducing hole 3 and the barrel weight reducing hole 5 are not connected; and the tube 6 and the smaller ring gear web 1 are randomly connected, and do not need to be positive.
  • the central connection of the gear teeth; plus the axial width of the cylinder weight reducing hole is smaller than the width between the two webs, substantially maintaining the integrity of the cylinder, avoiding the connecting member between the two webs as a "cantilever beam"
  • the unfavorable force structure makes the sprocket structure have high strength and rigidity, and the rigidity is greatly improved to further ensure the accuracy of the sprocket transmission.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)

Abstract

一种用作运动自行车的辐板（1）与筒体（2）刚性连接的变速链轮结构，其包括：相邻的不同直径的两辐板（1）、设于辐板（1）外圆的齿圈（4）。所述的两辐板（1）通过一环状筒体（2）连接成刚性的一体，所述辐板（1）沿其周向间隔设有辐板减重孔（3），所述筒体（2）沿其周向间隔设有筒体减重孔（5）。避免了两辐板之间的连接构件成"悬臂梁"的不利受力结构，因而使得链轮具有很高的强度与刚度，刚度的大幅度提高从而进一步保证了链轮变速传动的精准性。

Description

一种辐板与筒体刚性连接的变速链轮结构 技术领域
本发明涉及一种自行车用变速部件，尤其涉及一种重量轻、比刚度与比强度很高的运动自行车用变速链轮。
背景技术
随着社会的进步，现今各种交通工具对于轻量化、高强度的要求越来越高。目前自行车通常是通过材料轻量化与结构轻量化来进行减重，并且轻量化是以强度与刚度有足够的保障为前提，特别是对于运动型自行车来说，其对变速链轮的强度与刚度有着更高的要求。而变速链轮为自行车中最重要的零部件之一，其基本的性能需求是在质量一定的情况下，强度与刚度越高越好，即比强度与比刚度越高越好。
自行车的变速链轮为多层不同直径的齿圈平行设置的结构轮组，通常有两种典型结构形式，一种是冲压齿圈通过铆接叠装在一起形成的变速链轮(以SHIMANO为代表)，另一种是一种锥形(或塔形)空心体做支撑体的多层不同直径的齿圈平行设于其外圆的一体式链轮(以SRAM为代表)。前一种产品冲压齿圈通过铆接叠装在一起形成变速链轮的产品为多数，往往刚度与强度较小，承载能力较弱，并且质量较重，因而其比强度与比刚度较小，即使采用碳纤维做支撑结构的SHIMANO的M9000系列产品的比刚度也比较有限，质量也在350g以上，其外观通常显得比较笨重。但加工工艺性好；后一种为锥形(或塔形)空心体结构，且通常是由一块材料加工而成，因而具有较高的强度与刚度，但现有的这一结构设计中，任意两相临的齿圈之间有杆状的桥接部，该桥接部实质上是个杆状的筋条所构成的悬臂梁结构。比如以SRAM公司的专利(ZL 200910004713.4)为基础构成的一种空心锥体一体式链轮，此 链轮实现了多层齿一体加工，或者其余多圈齿一体加工再与最大圈齿装配，因而获得了较冲压齿圈通过铆接叠装在一起形成的变速链轮更好的比强度与比刚度，尤其获得了较轻的总质量，且具有镂空的视觉效果，外观漂亮。但是该结构存在其结构强度还不够高，刚性也比较有限，相对专业的运动车手来说，其比强度与比刚度还有待提高，原因是该结构为了获得更轻的质量，其各层齿圈是通过一种被称为桥接部的呈90度的折弯杆状构件进行连接，且该桥接部的外形呈L形臂状，其在使用时主要是抗扭，该结构在力学上实际上是一根悬臂，且其抗扭截模量很低，因而刚性较差，不适合在重负荷下工作。另外，其刚性不够同时还会影响其变速的平顺性。这一结构更多的强调了减重而忽视了强度与刚度，因而其强度与刚度比较有限，影响了其比强度与比刚度，在很多应用场合下还需要进一步增强。
因此，如何提供一种重量轻、强度与刚度高，满足运动自行车大载荷运行的自行车用变速链轮是业界亟待解决的问题。
发明内容
本发明为了解决现有自行车变速链轮的强度与刚度不高，还不能满足运动自行车大载荷运行的技术问题，提出一种重量轻、强度与刚度高，满足运动自行车大载荷运行的自行车用辐板与筒体刚性连接的变速链轮结构。
本发明提出一种辐板与筒体刚性连接的变速链轮结构，其包括：相邻的不同直径的两辐板、设于辐板外圆的齿圈。所述的两辐板通过一环状筒体连接成刚性的一体，所述辐板沿其周向间隔设有辐板减重孔，所述筒体沿其周向间隔设有筒体减重孔。
较优的，所述的筒体为圆柱体或圆锥台柱体。
较优的，所述筒体减重孔的轴向宽度小于两辐板之间的宽度。
较优的，所述辐板的下边缘设有环形加强筋。
较优的，所述辐板的下边缘设有减重凹槽。
较优的，所述辐板减重孔和筒体减重孔为直径不等的孔，两相邻孔的孔距相同或不相同。
较优的，所述的辐板减重孔和筒体减重孔至少为圆孔、矩形孔、腰形孔之一，各种形状、大小的减重孔任意组合排列。
较优的，所述的辐板和筒体的壁厚均为0.5～2.5mm。
较优的，所述齿圈的内表面与其辐板的内表面错开距离为0.1～1mm。
较优的，所述的辐板、齿圈和筒筋一体加工而成。
本发明的辐板和筒体在开好减重孔后基本上保留了其整体环形板或环形筒的结构，其减重孔与筒体之间的孔各自独立，没有联通；而且筒体减重孔之间的筒筋与较小齿圈的辐板为随机连接，不需要正对轮齿的中心连接；加上筒体减重孔的轴向宽度小于两辐板之间的宽度，基本保持了筒体的整体性，避免了两辐板之间的连接构件成“悬臂梁”不利的受力结构，因而使得链轮结构具有很高的强度与刚度，以致承载能力更强，刚度的大副度提高从而进一步保证了链轮变速传动的顺畅性。在保证具有很高的比强度与比刚度情况下，减重孔和减重凹槽的合理分布与开设能使得变速链轮具有较轻的质量，所有减重孔的和减重凹槽开出有利于排出链轮工作时的泥泞。辐板、筒体和齿圈构成一个整体，且由同一块整体材料自动加工而成，以致变速链轮刚度好，形状和尺寸精度高，大大有利于运动自行车的使用。本发明结构简单，加工便捷，成本较低，便于推广应用。
附图说明
图1为本发明较佳实施例的剖切示意图；
图2为变速链轮背面局部立体示意图；
图3为变速链轮正面局部立体示意图；
图4为另一种结构的变速链轮背面局部立体示意图；
其中，1--辐板、2--筒体、3--辐板减重孔、4--齿圈(链齿)、5--筒体减重孔、M--辐板与链齿错开距离、6--筒筋、7—环形加强筋、8--减重凹槽。
具体实施方式
下面对照附图结合实施例对本发明做详细的说明。
如图1～图3所示，为本发明较佳实施例的结构展示，所述的辐板与筒筋刚性连接的变速链轮结构，包括：相邻的一大一小的不同直径的两辐板1、设于该辐板外圆的齿圈4。所述的相邻两辐板1通过环状筒体2连接成刚性的一体，辐板1沿其周向间隔设有辐板减重孔3。筒体2沿其周向间隔设有筒体减重孔5，相邻筒体减重孔5之间为筒筋6。本实施例中，筒体2可以为圆柱体，也可以为圆锥台体。辐板1的下边缘可以设有环形加强筋7(见图1所示)，以便进一步加强辐板的强度和刚度。筒体减重孔5的轴向宽度a小于两辐板1之间的宽度b，可保持筒体2的基本完整性，以保证筒体2连接两相邻辐板1的刚度和强度。如图4所示，辐板1的下边缘设有减重凹槽8，该凹槽可以有各种形状，比如，圆弧形、或波浪形等等。在保证较高强度与刚度的前提下，减重凹槽8可以沿辐板1的径向开得更深，从而达到进一步减重之目的。本实施例中，所述的辐板减重孔3、筒体减重孔5大小可以为相等或不相等的孔，相邻两孔的孔距可以相同或不相同。减重孔可以为各类孔，比如，至少为圆孔、矩形孔、腰形孔之一种。根据辐板1构件或筒体2的尺寸大小，可以将各种形状的、不同大小的减重孔3、5任意组合排列。减重孔或减重凹槽的大小与分布将根据辐板或筒体的大小尺寸来确定，可以均布也可以任意分布。辐板1为一片状环形板状构件，根据需要，其厚度取值为0.5～2.5mm，筒体2的壁厚为0.5～2.5mm。齿圈4的内表面与其连接的辐板1的内表面错开一个距离M，数值为0.1～1mm，便于加工。所述的辐板1、齿圈4和筒体2由一块整体材料加工而成。
请参阅图1～图4，自行车的变数链轮通常由筒筋将两相邻的一大一小的两平行设置的辐板1连成一个整体，并且辐板与筒筋交替排列即可构成多级的阶梯状塔形(或锥形)整体筒形构件，传动用的链齿沿径向布置在塔形(或锥形)整体筒形构件上。任意相邻的两个齿圈4都可通过辐板1与筒体2连接构成链轮的相邻两级齿圈。本发明为了进一步提高一体式变速链轮的比强度与比刚度，对传统的“悬臂梁”连接结构进行了改进。本发明的辐板为整体板 状结构，其辐板减重孔3与筒体减重孔5之间没有联通；而且筒筋6与较小齿圈的辐板1为随机连接，不需要正对轮齿的中心连接；加上筒体减重孔的轴向宽度小于两辐板之间的宽度，基本保持了筒体的整体性，避免了两辐板之间的连接构件成“悬臂梁”的不利受力结构，因而使得链轮结构具有很高的强度与刚度，刚度的大副度提高从而进一步保证了链轮变速传动的精准性。
以上所述实施例主要是为了说明本发明的创作构思，应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。

Claims (10)

  1. 一种辐板与筒体刚性连接的变速链轮结构，包括相邻的不同直径的两辐板(1)，设于辐板外圆的齿圈(4)，其特征在于，所述的两辐板(1)通过一环状筒体(2)连接成刚性的一体，所述辐板(1)沿其周向间隔设有辐板减重孔(3)，所述筒体(2)沿其周向间隔设有筒体减重孔(5)。
  2. 如权利要求1所述的变速链轮结构，其特征在于，所述的筒体(2)为圆柱体或圆锥台柱体。
  3. 如权利要求1所述的变速链轮结构，其特征在于，所述筒体减重孔(5)的轴向宽度小于两辐板之间的宽度。
  4. 如权利要求1所述的变速链轮结构，其特征在于，所述辐板(1)的下边缘设有环形加强筋(7)。
  5. 如权利要求1所述的变速链轮结构，其特征在于，所述辐板(1)的下边缘设有减重凹槽(8)。
  6. 如权利要求1所述的变速链轮结构，其特征在于，所述的辐板减重孔(3)或筒体减重孔(5)为大小相等或不等的孔，两相邻孔的孔距相同或不相同。
  7. 如权利要求1所述的变速链轮结构，其特征在于，所述的辐板减重孔(3)和筒体减重孔(5)至少为圆孔、矩形孔、腰形孔之一，各种形状、大小的减重孔(3)或(5)任意组合排列。
  8. 如权利要求1所述的变速链轮结构，其特征在于，所述的辐板(1)和筒体(2)的厚度为0.5～2.5mm。
  9. 如权利要求1所述的变速链轮结构，其特征在于，所述齿圈(4)的内表面与其辐板(1)的内表面错开距离0.1～1mm。
  10. 如权利要求1所述的变速链轮结构，其特征在于，所述的辐板(1)、齿圈(4)和筒体(2)一体加工而成。
PCT/CN2017/119927 2017-11-22 2017-12-29 一种辐板与筒体刚性连接的变速链轮结构 WO2019100529A1 (zh)

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