CN107933812B

CN107933812B - High-rigidity integrated flywheel

Info

Publication number: CN107933812B
Application number: CN201711172747.5A
Authority: CN
Inventors: 郑潇然; 谢涛; 欧吉洲; 王浪; 申桂林
Original assignee: Hunan Naite Materials Technology Co ltd
Current assignee: Hunan Naite Materials Technology Co ltd
Priority date: 2017-11-22
Filing date: 2017-11-22
Publication date: 2023-06-23
Anticipated expiration: 2037-11-22
Also published as: CN107933812A; WO2019100479A1

Abstract

The invention provides a high-rigidity integrated flywheel, which comprises a gear ring and a plurality of annular supporting parts used for fixing adjacent gear rings, wherein each supporting part comprises a radial plate and cylindrical ribs uniformly distributed on the radial plate; between the adjacent supporting parts, one end of the first radial plate is overlapped with one end of the barrel rib of the next-stage supporting part to form a first overlap joint point, one end of the first barrel rib is overlapped with the inner side of the first radial plate, and the other end of the first barrel rib is overlapped and fixed with the outer side of the second radial plate to form a second overlap joint point; the first gear ring is fixed on the first lap joint point, and the third gear ring is fixed on the second lap joint point; the first radial plate is of an annular plate-shaped structure, and the inner side of the first radial plate far away from the first gear ring is provided with a continuous annular ring rib; at least one layer of second gear ring is arranged on the first cylinder rib along the radial direction; the fixed point of the second gear ring and the first cylinder rib is a third lap joint point. The high-rigidity integrated flywheel has the advantages of high rigidity, light weight and good manufacturability.

Description

High-rigidity integrated flywheel

Technical Field

The invention relates to a bicycle speed changing component, in particular to a high-rigidity integrated flywheel.

Background

With the progress of society, various vehicles are increasingly required to be lightweight and high in strength. At present, the weight of a bicycle is usually reduced by material weight and structure weight, and the weight reduction is on the premise that the strength and the rigidity are enough, and particularly for sports bicycles, the strength and the rigidity of a speed-changing chain wheel are higher. The variable speed sprocket is one of the most important parts in a bicycle, and the basic performance requirement is that the higher the strength and the rigidity are, the better the quality is.

The speed-changing chain wheel is a multi-layer gear ring structure, and two typical structural forms are adopted, namely, a stamped gear ring represented by SHIMANO company is stacked together through riveting to form the speed-changing chain wheel, and the other type is represented by SRAM company and adopts a conical hollow body as an integral flywheel of a supporting structure. The former product has lower rigidity and strength, weaker bearing capacity and heavier mass, but relatively better processing manufacturability; the latter is a conical hollow body structure, and most gear rings are usually made of one piece of material, so that the gear rings have higher strength and rigidity, but in the design, each layer of gear rings is required to correspond to a cylinder coaxial with a rotation axis, and the structure has poor manufacturability when the tooth number difference between two adjacent layers of gear rings is smaller, so that the processing of a lightening hole and positive and negative teeth is unfavorable, and the quality is larger.

Disclosure of Invention

The invention aims to solve the technical problems and provide an integrated flywheel with high rigidity, light weight and good manufacturability.

The invention is realized by the following technical scheme:

a high-rigidity integrated flywheel comprises a plurality of gear rings which are different in size, are used for receiving a chain and transmitting circumferential force transmitted by the chain to a bicycle rear wheel hub, and annular supporting parts used for fixing adjacent gear rings, wherein the chain can be changed from one gear ring to the other gear ring through a speed change mechanism; the support part comprises a first stage support part and a second stage support part … which are formed by a web plate and a cylindrical rib, and so on; the first-stage supporting part comprises a first radial plate and a plurality of first barrel ribs distributed on the first radial plate, the second-stage supporting part comprises a second radial plate and a plurality of second barrel ribs uniformly distributed on the second radial plate, and so on; between the adjacent supporting parts, one end of the first radial plate is overlapped with one end of the cylinder rib of the next-stage supporting part to form a first overlap joint point, one end of the first cylinder rib is overlapped with the inner side of the first radial plate, and the other end of the first cylinder rib is overlapped and fixed with the outer side of the second radial plate to form a second overlap joint point; the first gear ring is fixed on the first lap joint point, and the third gear ring is fixed on the second lap joint point; the first radial plate is of an annular plate-shaped structure, and the inner side of the first radial plate far away from the first gear ring is provided with a continuous annular ring rib; at least one layer of second gear ring is arranged on the first barrel rib along the radial direction, and a first lightening hole is arranged on the web plate.

Preferably, the outer diameter of the supporting part is the same as the inner diameter of the corresponding gear ring, and any two supporting parts are similar in shape; the webs of all the support parts are sequentially overlapped with the cylindrical ribs to form a multi-stage stepped conical member, and the corresponding gear ring is fixed on the conical member to form a flywheel or one part of the flywheel.

Preferably, the first ribs and the second ribs are supported by the first ribs, and the two adjacent first ribs, the first ribs on the upper side and the second ribs on the lower side form a drain hole.

Preferably, the relation between the number m of the blow-off holes and the number Z of the teeth of the lapped third gear ring (6 a) is Z- (0.5 x Z+1) less than or equal to m less than or equal to Z+ (0.5 x Z+1), and m and Z are integers.

Preferably, the ribs are vertically lapped on the web.

Preferably, the second gear ring is located between the first gear ring and the third gear ring, and the diameter relation among the third gear ring, the second gear ring and the first gear ring is sequentially enlarged to form the cone tower-shaped multi-layer speed change gear ring.

Preferably, the fixed point of the second gear ring and the first cylinder rib is a third lap joint point, when more than two second gear rings are arranged on the same first cylinder rib, the diameter relation between the second gear rings is in accordance with the conical tower-shaped multi-layer speed change gear ring, and a plurality of third lap joint points are uniformly distributed on the first cylinder rib.

Preferably, the fixing point of the second gear ring and the first barrel rib is a third lap joint point, and when the second gear ring on the same first barrel rib is one, the third lap joint point is arranged in the central area of the first barrel rib.

Preferably, the fixed point of the second gear ring and the first barrel rib is a third lap joint point, the third lap joint points of the plurality of first barrel ribs on the first-stage supporting part on the same horizontal plane are sequentially connected to form a limiting area, and the part of the second gear ring between the adjacent third lap joint points is outwards recessed away from the limiting area to form a first weight reduction groove.

Preferably, the ring rib is provided with a second weight-reducing groove.

Preferably, the web is provided with a first lightening hole, and the first lightening hole is one of a circle, a kidney shape and a square shape or any combination of the circle, the kidney shape and the square shape.

Preferably, the web, the ribs and the ring gear are machined from a single piece of unitary material.

The beneficial effects are that:

compared with the prior art, the high-rigidity integrated flywheel has the advantages that through arranging the complete ring ribs on the annular radial plate, the rigidity and the torsional deformation capacity in the circumferential direction are much higher than those of the annular radial plate in a broken form, so that the torsion transmitted by the gear ring is better and uniformly dispersed, and therefore, under the same mass, the flywheel can bear higher torsional moment, and the torsional strength, the rigidity and the service life of the flywheel are correspondingly greatly improved under the condition of unchanged load compared with those of the prior art; meanwhile, the high-rigidity integrated flywheel disclosed by the invention has the advantages that at least one layer of second gear ring is arranged on the cylinder rib, so that one layer of supporting part is saved, the diameter of the cylinder rib can be properly increased without increasing the whole weight, the effects of simplifying the structure and reducing the weight are achieved, the torsional strength capacity is enhanced, the rigidity is improved and the service life is prolonged, in addition, when the processing is carried out, especially when the tooth number difference of adjacent gear rings is small, the distance between the webs is increased along with the increase of the height of the cylinder rib, so that the movable space of a processing cutter is effectively increased, and the diameter of the processed cutter can be flexibly selected, so that the manufacturability is better and the processing quality is better.

Drawings

The invention is described in further detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a partial schematic view of a support portion in relation to a ring gear;

fig. 2 is a three-dimensional schematic of a section of a flywheel.

Detailed Description

The components in this embodiment, such as the first stage support portion 1 and the second stage support portion 1a, the first web 2 and the second web 2a, the first barrel bead 3 and the second barrel bead 3a, and the first ring gear 6 and the third ring gear 6a, are identical or similar in form, structure, and size, and should be representative in the corresponding expansion of the repeating members.

As shown in fig. 1, a high-rigidity integrated flywheel comprises a plurality of ring gears of different sizes for receiving a chain and transmitting circumferential force transmitted from the chain to a rear wheel hub of a bicycle, and an annular supporting portion for fixing the ring gears, the chain being exchangeable from one ring gear to another by a speed change mechanism; the support part comprises a first stage support part 1, a second stage support part 1a … and the like, wherein the first stage support part 1 consists of a web plate and a cylindrical rib; the first-stage supporting part 1 comprises a first radial plate 2 and a plurality of first barrel ribs 3 distributed on the first radial plate 2, the second-stage supporting part 1a comprises a second radial plate 2a and a plurality of second barrel ribs 3a uniformly distributed on the second radial plate 2a, and so on; between the adjacent supporting parts, one end of the first radial plate 2 is lapped with one end of a cylindrical rib of the next-stage supporting part to form a first lapping point 4, one end of the first cylindrical rib 3 is lapped with the inner side of the first radial plate 2, and the other end of the first cylindrical rib 3 is lapped and fixed with the outer side of the second radial plate 2a to form a second lapping point 4a; the first ring gear 6 is fixed to the first joint point 4, and the third ring gear 6a is fixed to the second joint point 4a; the web can be an annular plate with the thickness of 0.5-2.5 mm according to the characteristics of materials, the strength is influenced by excessive thinning, and subsequent processing procedures such as weight reducing holes or weight reducing grooves are formed, the material cost is wasted due to excessive thickness, the processing cutter is worn relatively quickly, and the volume of the flywheel is increased; the inner side of the first web plate 2 far away from the first gear ring 6 is provided with a continuous annular ring rib 5; the circumferential force transmitted by the chain acts on the first lap joint 4 through the first gear ring 6, and is further transmitted to the first web 2, and because the first web 2 is a whole plate, the transmitted moment is uniformly dispersed, and therefore, the rigidity and the torsional deformation capacity in the circumferential direction are much higher than those of the broken form, so that the torsional strength, the rigidity and the service life of the flywheel are greatly improved under the same mass.

Meanwhile, at least one layer of second gear rings 7 is arranged on the first cylinder rib 3 along the radial direction, and the number of the second gear rings 7 added on the first cylinder rib 3 is preferably one to four layers in consideration of the integral form, size and weight factors of the flywheel, so that too many second gear rings can influence the supporting strength and the processing manufacturability; the fixed point of the second gear ring 7 and the first cylinder rib 3 is a third lap joint point 10; for convenience of description and understanding, although the second ring gear 7 does not correspond to the supporting portion, this section and the following description will assume a supporting member, that is, the first stage supporting portion 1, the second stage supporting portion 1a or the like, which is a supporting and fixing structure necessary for each layer of ring gear when the present design is not adopted; by the design scheme, at least two layers of gear rings are combined and designed on one supporting part, so that one supporting part is shared by two or more layers of gear rings corresponding to one layer of supporting members of an original structure, the supporting members corresponding to the second gear rings 7 are omitted, the effect of simplifying the structure is achieved, the first barrel rib 3 is considered to be combined with the multiple layers of gear rings, the distance between the gear rings is unchanged, and therefore the first barrel rib needs to be thickened and heightened, but the form of one layer of gear rings corresponding to one supporting member relative to the original structure is needed, the total mass of the flywheel is reduced after one layer of supporting members is omitted, and the rigidity and the torsion resistance in the circumferential direction are improved due to the thickening of the first barrel rib 3; meanwhile, as the height of the first barrel ribs 3 is increased, the distance between the adjacent first radial plates 2 and the second radial plates 2a is greatly increased, when the gear ring is machined and manufactured, particularly when the gear number difference between the adjacent gear rings is small, the space for the machining cutters can be increased, more proper cutters and more proper cutter feeding and retracting distances can be selected according to the needs, and finally, the regional metal machining manufacturability between the first barrel ribs 3 is obviously optimized, the quality is better, and the region between the second barrel ribs 3a is the same.

In a preferred embodiment, as shown in fig. 1 and 2, the outer diameter of the supporting portion is the same as the inner diameter of the corresponding gear ring, so that all the webs of the supporting portion and the ribs of the drum form a multi-stage stepped conical member 9 in a sequential lap joint mode, the corresponding gear ring is fixed on the conical member 9 to form a flywheel or one part of the flywheel, the connection mode of the gear ring and the conical member 9 can be integrated connection, or two independent modules are processed to be connected into a non-detachable unit through subsequent processes, the webs, the ribs of the drum and the gear ring are preferably processed by adopting a whole material, the connection among different parts is further fastened, circumferential force transmitted by a chain forms torsion force to the lap joint (not numbered in the drawing) through the first gear ring 6, the first web 2 further applies moment to the first drum rib 3, the first drum rib 3 transfers the moment to the first joint 4 again to the web of the next supporting portion so as to finally apply the moment to the supporting portion with the smallest diameter, and the bicycle is not connected with the hub through the whole diameter of the hub.

In the preferred embodiment, as shown in fig. 2, the adjacent first webs 2 and the second webs 2a are supported by the first cylindrical ribs 3, and any two adjacent first cylindrical ribs 3, the first web 2 positioned on the upper side and the second web 2a positioned on the lower side form a drain hole 8, so that the mud during the operation of the flywheel is discharged, and the arrangement of the drain hole 8 is beneficial to reducing the total mass of the flywheel; the relation between the number m of the drain holes 8 and the number Z of teeth of the lapped third gear ring 6a is Z- (0.5×z+1). Ltoreq.m.ltoreq.z+ (0.5×z+1), m and Z are integers, for example, when the number Z of teeth of the third gear ring 6a is 20, the number m of the drain holes 8 is any integer value within the range of 20±11, which means that the first ribs 3 can be aligned or not aligned with the centers of the teeth of the smaller diameter third gear ring 6a, the number Z of teeth is 20 and the number m of the drain holes 8 is 20, the difference between the two is 0, the first ribs 3 are aligned with the centers of the teeth of the third gear ring 6a, the uniformity of rigidity is better, and when the difference between the two is not 0, the first ribs 3 can be staggered with the centers of the teeth of the smaller diameter third gear ring 6a by a certain angle, the requirements of processing manufacturability and high strength can be better adapted, the width of the drain holes 8 between the first ribs 3 can be adjusted to a certain extent as required, and the difference between the different widths of the drain holes 8 can also be set to be convenient for processing.

In a preferred embodiment, as shown in fig. 1 and 2, the second gear ring 7 is located between the first gear ring 6 with a larger diameter and the third gear ring 6a with a smaller diameter, and the diameters of the third gear ring 6a, the second gear ring 7 and the first gear ring 6 are sequentially enlarged to form a cone tower-shaped multi-layer speed change gear ring, so that the functions of the chain can be conveniently adjusted according to the requirement by the first gear ring 6 and the second gear ring 7 on the same first cylindrical rib 3, and meanwhile, the cone tower-shaped multi-layer speed change gear ring and the inclination direction of the cone member 9 are adapted to prevent the waste of materials caused by the increase of the diameters of the gear rings on the second stage supporting part 1 a.

In a preferred embodiment, when two or more second gear rings 7 are arranged on the same first cylindrical rib 3, the diameter relationship between the second gear rings 7 should conform to the relationship of the cone-tower-shaped multi-layer speed change gear rings, and a plurality of third lap points 10 are uniformly distributed on the first cylindrical rib 3, so that the distance between the multi-layer gear rings is suitable, the processing is convenient, and the speed change performance can be ensured.

In the preferred embodiment, as shown in fig. 1, when the number of the second gear rings 7 on the same first cylindrical rib 3 is one, the third lap joint point 10 is arranged in the central area of the first cylindrical rib 3, so that the distances among the third gear ring 6a, the second gear ring 7 and the first gear ring 6 are suitable, the processing is convenient, and the speed change performance can be ensured.

In a preferred embodiment, as shown in fig. 2, for convenience of understanding, the third lapping points 10 defining the plurality of first ribs 3 on the first stage supporting part 1 on the same horizontal plane are sequentially connected to form a limiting area, the parts of the second gear ring 7 between the adjacent third lapping points 10 are outwards concave away from the limiting area to form a first weight reducing groove 11, the preferred shape of the first weight reducing groove 11 is arc-shaped or semi-square with excessive arc on two sides, the first weight reducing groove 11 can be machined from the inner part of the conical structure to the outer part of the second gear ring 7 according to the requirement because the height of the first ribs 3 is increased, and the first weight reducing groove 11 should be arranged to avoid being close to the third lapping point 10 when being machined, so that the mass of the second gear ring 7 is reduced, and the whole mass of the flywheel is reduced, and meanwhile, the rigidity and the torsion resistance of the structure of the second gear ring 7 and the combined first ribs 3 are not reduced because the connection relation of the third lapping points 10 is not influenced by machining.

In a preferred embodiment, as shown in fig. 2, the web is provided with a first lightening hole 21, the shape of the first lightening hole 21 can be a round hole, a waist-shaped hole or a square hole, or a combination of the round hole and the square hole, the size of each hole can be determined according to the width of the web, the holes are not communicated after being perforated, and no first lightening hole 21 extends to the ring rib 5, so that the integrity of the ring rib 5 is maintained, the first web 2 is a whole plate rather than a broken plate, the torsion resistance and rigidity are improved, the mass of the first web 2 is reduced to reduce the total mass of the flywheel by arranging the first lightening hole 21, and mud during the working of the flywheel can be discharged along the blow-down hole 8 through the first lightening hole 21.

In the preferred embodiment, as shown in fig. 2, the first barrel rib 3 is provided with a second lightening hole 31, and after the second lightening hole 31 is formed, the torsion resistance and rigidity of the connecting structure are not affected, and the mass of the first barrel rib 3 is reduced, so that the total mass of the flywheel is reduced.

In a preferred embodiment, as shown in fig. 2, the ring rib 5 is provided with a second weight-reducing groove 51, which is favorable for reducing the mass of the first radial plate 2 and further reducing the total mass of the flywheel, and the second weight-reducing groove 51 is preferably in a circular arc shape or a semi-square shape, the two sides of which are provided with circular arcs are excessive, and the second weight-reducing groove 51 should not interfere with the first weight-reducing hole 21 so as to ensure that the integrity of the ring rib 5 is avoided; the second weight-reducing groove 51 is machined from the semifinished product of the conical member 9 during milling to ensure manufacturability.

The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and any modifications or equivalent substitutions without departing from the spirit and scope of the present invention should be covered in the scope of the technical solution of the present invention.

Claims

1. A high-rigidity integrated flywheel comprises a plurality of gear rings which are different in size, are used for receiving a chain and transmitting circumferential force transmitted by the chain to a bicycle rear wheel hub, and annular supporting parts used for fixing adjacent gear rings, wherein the chain can be changed from one gear ring to the other gear ring through a speed change mechanism; the method is characterized in that: the support part comprises a first-stage support part (1) and a second-stage support part (1 a) … which are formed by a web plate and a cylindrical rib, and so on; the first-stage supporting part (1) comprises a first web (2) and a plurality of first barrel ribs (3) distributed on the first web (2), the second-stage supporting part (1 a) comprises a second web (2 a) and a plurality of second barrel ribs (3 a) uniformly distributed on the second web (2 a), and so on;

between adjacent supporting parts, one end of the first radial plate (2) is overlapped with one end of a cylindrical rib of the next-stage supporting part to form a first overlap joint (4), one end of the first cylindrical rib (3) is overlapped with the inner side of the first radial plate (2), and the other end of the first cylindrical rib (3) is overlapped and fixed with the outer side of the second radial plate (2 a) to form a second overlap joint (4 a); the first gear ring (6) is fixed on the first lap joint (4), and the third gear ring (6 a) is fixed on the second lap joint (4 a);

the first radial plate (2) is of an annular plate-shaped structure, and the inner side of the first radial plate (2) far away from the first gear ring (6) is provided with a continuous annular ring rib (5);

at least one layer of second gear ring (7) is arranged on the first cylinder rib (3) along the radial direction.

2. The high rigidity integrated flywheel of claim 1 wherein: the outer diameter of the supporting part is the same as the inner diameter of the corresponding gear ring, and any two supporting parts are similar in shape; the webs of all the support parts are sequentially overlapped with the cylindrical ribs to form a multi-stage stepped conical member (9), and the corresponding gear ring is fixed on the conical member (9) to form a flywheel or one part of the flywheel.

3. A highly rigid integrated flywheel as claimed in claim 1 or 2 wherein: the adjacent first webs (2) and the second webs (2 a) are supported by first cylindrical ribs (3), and two adjacent first cylindrical ribs (3), the first webs (2) positioned on the upper side and the second webs (2 a) positioned on the lower side form a drain hole (8).

4. A high rigidity integrated flywheel as defined in claim 3 wherein: the relation between the number m of the sewage draining holes (8) and the number Z of the teeth of the lapped third gear ring (6 a) is Z- (0.5 x Z+1) less than or equal to m less than or equal to Z+ (0.5 x Z+1), and m and Z are integers.

5. A highly rigid integrated flywheel as claimed in claim 1 or 2 wherein: the cylinder ribs are vertically lapped on the web plate.

6. A highly rigid integrated flywheel as claimed in claim 1 or 2 wherein: the second gear ring (7) is located between the first gear ring (6) and the third gear ring (6 a), and the diameter relations of the third gear ring (6 a), the second gear ring (7) and the first gear ring (6) are sequentially enlarged to form a cone tower-shaped multi-layer speed change gear ring.

7. The high rigidity integrated flywheel of claim 6 wherein: the fixed point of the second gear ring (7) and the first cylinder rib (3) is a third lap joint point (10), and when the second gear ring (7) positioned on the same first cylinder rib (3) is provided with more than two, the diameter relation between the second gear rings (7) is in line with the cone-tower-shaped multi-layer speed change gear ring, and a plurality of third lap joint points (10) are uniformly distributed on the first cylinder rib (3).

8. A highly rigid integrated flywheel as claimed in claim 1 or 2 wherein: the fixed point of the second gear ring (7) and the first barrel rib (3) is a third lap joint point (10), and when the second gear ring (7) positioned on the same first barrel rib (3) is one, the third lap joint point (10) is arranged in the central area of the first barrel rib (3).

9. A highly rigid integrated flywheel as claimed in claim 1 or 2 wherein: the fixed point of the second gear ring (7) and the first barrel ribs (3) is a third lapping point (10), the third lapping points (10) of the first barrel ribs (3) on the same horizontal plane on the first-stage supporting part (1) are sequentially connected to form a limiting area, and the part, between the adjacent third lapping points (10), of the second gear ring (7) is outwards recessed away from the limiting area to form a first weight reduction groove (11).

10. A highly rigid integrated flywheel as claimed in claim 1 or 2 wherein: the ring rib (5) is provided with a second weight reduction groove (51).

11. A highly rigid integrated flywheel as claimed in claim 1 or 2 wherein: the radial plate is provided with a first lightening hole (21), and the first lightening hole (21) is one of a round shape, a waist shape and a square shape or any combination of the round shape, the waist shape and the square shape.

12. A highly rigid integrated flywheel as claimed in claim 1 or 2 wherein: the web, the cylindrical ribs and the gear ring are formed by processing a whole material.