CN107839833B

CN107839833B - Speed-changing chain wheel structure with rigidly connected radial plates and cylinder ribs

Info

Publication number: CN107839833B
Application number: CN201711173148.5A
Authority: CN
Inventors: 郑潇然; 郑英; 谢涛; 欧吉洲; 王浪
Original assignee: Hunan Naite Material Technology Co ltd
Current assignee: Hunan Suao Technology Co ltd
Priority date: 2017-11-22
Filing date: 2017-11-22
Publication date: 2020-04-24
Anticipated expiration: 2037-11-22
Also published as: CN107839833A; WO2019100528A1

Abstract

The invention discloses a speed-changing chain wheel structure used for rigidly connecting a radial plate and a tube rib of a sports bicycle, which comprises: two adjacent radials with different diameters are arranged on the gear ring of the excircle of the radials. The two radial plates are connected into a rigid whole through the barrel ribs arranged at intervals in an annular mode, and the radial plates are provided with lightening holes at intervals along the circumferential direction of the radial plates. The invention avoids the connecting component between the two radial plates from forming a cantilever beam unfavorable stress structure, thereby leading the chain wheel to have high strength and rigidity, and improving the large auxiliary degree of the rigidity, thereby further ensuring the variable speed transmission accuracy of the chain wheel.

Description

Speed-changing chain wheel structure with rigidly connected radial plates and cylinder ribs

Technical Field

The invention relates to a speed change component for a bicycle, in particular to a speed change chain wheel for a sport bicycle, which has light weight and high specific rigidity and specific strength.

Background

With the progress of society, the demand for light weight and high strength of various vehicles is higher and higher nowadays. At present, the weight of the bicycle is reduced by generally reducing the weight of materials and the weight of the structure, and the weight reduction is based on the premise that the strength and the rigidity are sufficiently ensured, and particularly for sports bicycles, the strength and the rigidity of a speed changing chain wheel are required to be higher. The basic performance requirement of the speed changing sprocket is that the strength and the rigidity are higher and better under the condition of certain mass, namely the specific strength and the specific rigidity are higher and better.

The speed changing chain wheel of the bicycle is a structural wheel set with a plurality of layers of gear rings with different diameters arranged in parallel, and generally has two typical structural forms, namely a speed changing chain wheel (represented by SHIMINO) formed by stamping and stacking gear rings together through riveting, and an integrated chain wheel (represented by SRAM) with a plurality of layers of gear rings with different diameters arranged in parallel on the outer circle of the integrated chain wheel, wherein a conical (or tower-shaped) hollow body is used as a support body. Most of the former products are formed by riveting and stacking the punched gear rings together to form the variable speed sprocket, and the products are often small in rigidity and strength, weak in bearing capacity and heavy in mass, so that the specific strength and specific rigidity are small, even though the specific rigidity of the series M9000 products of SHIMARNO adopting carbon fibers as a support structure is limited, the mass is more than 350g, the appearance of the products is heavy generally, but the processing manufacturability is good; the latter is a tapered (or tower-shaped) hollow body structure, and is usually made of a single piece of material, and thus has high strength and rigidity, but in this prior art design, a rod-shaped bridge portion is provided between any two adjacent gear rings, and the bridge portion is essentially a cantilever beam structure formed by rod-shaped ribs. For example, a hollow cone integrated sprocket wheel is formed on the basis of a patent (ZL 200910004713.4) of the SRAM company, and the sprocket wheel realizes the integrated processing of multiple layers of teeth, or the integrated processing of other multiple rings of teeth is assembled with the largest ring of teeth, so that the specific strength and the specific rigidity which are better than those of a variable speed sprocket wheel formed by riveting and overlapping stamping gear rings are obtained, particularly, the total weight is lighter, the visual effect of hollowing is realized, and the appearance is attractive. However, the structure has insufficient structural strength and limited rigidity, and the specific strength and specific rigidity of the structure are still to be improved compared with those of professional sports motorcyclists because the structures have lighter weight, the gear rings of the structures are connected through a bent rod-shaped component which is called a bridge part and is 90 degrees, the bridge part is in an L-shaped arm shape and mainly resists torsion when in use, the structure is actually a cantilever in mechanics, and the torsion shear modulus of the structure is low, so that the structure is poor in rigidity and is not suitable for working under heavy load. In addition, the rigidity is not enough and the smoothness of the speed change is also affected. The structure emphasizes weight reduction while neglecting strength and rigidity, so that the strength and the rigidity are relatively limited, the specific strength and the specific rigidity are influenced, and further reinforcement is needed in many application occasions.

Therefore, it is an urgent need in the art to provide a bicycle derailleur sprocket that is light in weight, high in strength and rigidity, and capable of satisfying the heavy load operation of a sports bicycle.

Disclosure of Invention

The invention provides a speed change sprocket structure for rigidly connecting a radial plate and a tube rib of a bicycle, which has light weight and high strength and rigidity and meets the requirement of heavy-load operation of the sports bicycle, and aims to solve the technical problems that the strength and the rigidity of the existing speed change sprocket of the bicycle are not high and the requirement of heavy-load operation of the sports bicycle cannot be met.

The invention provides a speed-changing chain wheel structure with a radial plate and a cylinder rib rigidly connected, which comprises: two adjacent radials with different diameters are arranged on the gear ring of the excircle of the radials. The two radial plates are connected into a rigid whole through the barrel ribs arranged at intervals in an annular mode, and the radial plates are provided with lightening holes at intervals along the circumferential direction of the radial plates.

Preferably, the lightening holes are holes with different diameters, and the hole distances of two adjacent holes are the same or different.

Preferably, the lightening holes are at least one of round holes, rectangular holes and waist-shaped holes, and the lightening holes in various shapes and sizes are randomly combined and arranged.

Preferably, the weight reduction groove is formed in the lower edge of the radial plate between the two cylinder ribs.

Preferably, the lower edge of the cylinder rib is also provided with a weight reduction groove.

Preferably, the thickness of the spoke plate is 0.5-2 mm.

Preferably, the inner surface of the gear ring and the inner surface of the radial plate of the gear ring are staggered by 0.1-1 mm.

Preferably, the wheel disk, the gear ring and the cylinder rib are integrally processed.

The spoke plate is of an integral plate-shaped structure, and lightening holes of the spoke plate are not communicated with holes among the tube ribs; the cylinder ribs are randomly connected with the radial plate of the smaller gear ring, and the radial plate does not need to be connected with the center of the gear teeth; the circumferential dimension of the added cylindrical ribs is wider, so that the connecting member between the two radial plates is prevented from forming a cantilever beam unfavorable stress structure, the chain wheel has high strength and rigidity, the bearing capacity is improved, and the smoothness of the variable speed transmission of the chain wheel is further ensured due to the large auxiliary degree improvement of the rigidity. Under the condition of ensuring that the chain wheel structure has high strength and rigidity, the reasonable distribution and arrangement of the lightening holes and the lightening grooves can ensure that the variable speed chain wheel has light weight. All the lightening holes and lightening grooves are beneficial to discharging mud generated when the chain wheel works. The radial plate, the cylinder body and the gear ring form a whole and are automatically processed by the same integral material, so that the speed change chain wheel has good rigidity and high shape and size precision, and is greatly beneficial to the use of a sports bicycle. The invention has simple structure, convenient processing, lower cost and convenient popularization and application.

Drawings

FIG. 1 is a sectional view of a preferred embodiment of the present invention;

FIG. 2 is a partial perspective view of the rear of the shift sprocket;

FIG. 3 is a front partial perspective view of the shift sprocket.

Wherein, 1-spoke plate, 2-weight reduction groove at the lower edge of the spoke plate, 3-weight reduction hole, 4-gear ring (sprocket), 5-cylinder rib, M-distance of the surface of the spoke plate and the sprocket surface staggered, 6-weight reduction groove at the lower edge of the cylinder rib.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1 to 3, for structural demonstration of a preferred embodiment of the present invention, the speed changing sprocket structure with a rigid connection between a web and a cage bar includes: two adjacent radial plates 1 with different diameters, one larger and one smaller, and a gear ring 4 arranged on the excircle of the radial plate. Two adjacent radials 1 connect into rigid an organic whole through the section of thick bamboo muscle 5 that the annular interval set up, radials 1 is equipped with lightening hole 3 along its circumference interval. In this embodiment, the lightening holes 3 may be holes with equal or different diameters, and the pitch between two adjacent holes may be the same or different. The lightening holes 3 may take various shapes, such as circular holes, rectangular holes, kidney-shaped holes, and the like. The lightening holes 3 in various shapes and sizes can be randomly combined and arranged according to the size of the components of the web 1. The lower edge of the radial plate 1 between the two tube ribs 5 is provided with the weight reduction groove 2, on the premise that higher strength and rigidity can be guaranteed, the weight reduction groove 2 can be deeper along the radial direction of the radial plate, and the lower edge of the tube rib 5 can also be provided with the weight reduction groove 6, so that the purpose of further reducing weight is achieved. The size and the distribution of the lightening holes 3 and the tube ribs 5 are determined according to the size of the spoke plate, and the lightening holes can be uniformly distributed or randomly distributed. The radial plate 1 is a sheet-shaped annular plate-shaped component, and the thickness value is 0.5-2 mm according to needs. The inner surface of the gear ring 4 and the inner surface of the connected radial plate 1 are staggered by a distance M, the numerical value is 0.1-1 mm, and the processing is convenient. The radial plate 1, the gear ring 4 and the cylinder rib 5 are processed by a whole material.

Referring to fig. 1 to 3, a variable sprocket for a bicycle is generally formed by integrally connecting two adjacent large and small webs 1 arranged in parallel by a web, and the webs and the web are alternately arranged to form a multi-stage stepped tower-shaped (or tapered) integral cylindrical member, and a driving sprocket is radially arranged on the tower-shaped (or tapered) integral cylindrical member. Any two adjacent gear rings can be connected with the drum ribs through the wheel disc to form two adjacent gear rings of the chain wheel. In order to further improve the specific strength and specific rigidity of the integrated speed change chain wheel, the invention improves the traditional cantilever beam connecting structure. The spoke plate is of an integral plate-shaped structure, and lightening holes of the spoke plate are not communicated with holes among the tube ribs; the cylinder ribs are randomly connected with the radial plate of the smaller gear ring, and the radial plate does not need to be connected with the center of the gear teeth; the circumferential dimension of the added cylindrical ribs is wider, so that the connecting component between the two radial plates is prevented from forming an unfavorable stress structure of a cantilever beam, the chain wheel has high strength and rigidity, and the large auxiliary degree of the rigidity is improved, so that the variable speed transmission accuracy of the chain wheel is further ensured.

The above-mentioned embodiments are mainly intended to illustrate the inventive concept, and it should be noted that those skilled in the art may make various changes and modifications without departing from the inventive concept, and all such changes and modifications are within the scope of the present invention.

Claims

1. The utility model provides a radials and section of thick bamboo muscle rigid connection's variable speed sprocket structure, includes two radials (1) of adjacent different diameters, locates ring gear (4) of radials excircle, its characterized in that, two radials (1) link into a rigid an organic whole through section of thick bamboo muscle (5) that the annular interval set up, radials (1) are equipped with lightening hole (3) along its circumference interval, lightening hole (3) be the hole that the diameter equals or differs, the hole pitch of two adjacent holes is the same or inequality, radials (1) radial inboard between two section of thick bamboo muscle (5) is equipped with subtracts heavy recess (2), subtract heavy recess (2) with lightening hole (3) do not communicate.

2. The transmission sprocket assembly as defined in claim 1, wherein said lightening holes (3) are at least one of circular holes, rectangular holes, and kidney-shaped holes, and the lightening holes (3) of various shapes and sizes are arranged in any combination.

3. The transmission sprocket structure according to claim 1, wherein the lower edge of the barrel rib (5) is provided with a weight-reduction groove (6).

4. The speed change sprocket structure according to claim 1, wherein said web (1) has a thickness of 0.5 to 2 mm.

5. The variable speed sprocket arrangement according to claim 1, wherein the inner surface of the ring gear (4) is offset from the inner surface of its web (1) by 0.1 to 1 mm.

6. The speed change sprocket arrangement as claimed in claim 1, wherein said web (1), ring gear (4) and ribs (5) are integrally formed.