CN1486903A - Gear crank for bicycle and producing method thereof - Google Patents
Gear crank for bicycle and producing method thereof Download PDFInfo
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- CN1486903A CN1486903A CNA031562833A CN03156283A CN1486903A CN 1486903 A CN1486903 A CN 1486903A CN A031562833 A CNA031562833 A CN A031562833A CN 03156283 A CN03156283 A CN 03156283A CN 1486903 A CN1486903 A CN 1486903A
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- gear
- crank
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- gears
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- 238000000034 method Methods 0.000 title claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 description 14
- 238000009434 installation Methods 0.000 description 7
- 238000004080 punching Methods 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001141 propulsive effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- Transmissions By Endless Flexible Members (AREA)
Abstract
In this gear crank (1) for a bicycle, a plurality of gears are unified in parallel with each other so that diameter thereof is reduced in order from an outer side, and this gear set (2) is fixed to a boss part (41) of a crank arm (40) for fixation. Among the plurality of gears, a selected first gear is provided with an inward projection (14) to be fitted between gear teeth (33) of a second gear when the center of the first gear is overlapped with the center of the second gear selected on the small-diameter side of the first gear. This inward projection (14) forms a part of the first gear positioned in the most inside in the radial direction, and the first gear is connected to an adjacent gear on the small-diameter side near the inward projection (14).
Description
Technical field
The present invention relates to gear crank for bicycle, particularly relate to the multiple stage gear crank for bicycle of the gear that is arranged side by side more than 3.
Background technology
Bicycle driving mechanism has as the gear crank of front gear with as back-geared free gear, between the gear of the gear of gear crank and free gear around hanging ring chain.On the crank arm of gear crank, pedal is installed.When the gear crank positive dirction was rotated, this rotation was passed to free gear by ring chain, and its positive dirction is rotated, so the rotation of trailing wheel positive dirction, and bicycle marches forward.
Nearest bicycle nearly all has speed-changing mechanism.With this speed-changing mechanism as outside under the situation of speed-changing mechanism of dress, usually, free gear is made multiple stage, according to circumstances difference also can make multiple stage with gear crank.For the chain on the gear that will hang over this free gear, forcibly change and hang on other gears, the back delayer contiguous with free gear is set; On the other hand,, forcibly change and hang on other gears, the preceding delayer contiguous with this multi-stage gear crank also need be set for the chain on the gear that will hang over the multi-stage gear crank.Like this, can obtain the speed change of the progression that the number of gears with the number of gears of multistage free gear and multi-stage gear crank multiplies each other.
This multiple stage gear crank is provided with a plurality of gears (for example, opening flat 9-86471 communique referring to the spy) that reduce successively as gear, the inside diameter of maximum gauge with external gear abreast.So these a plurality of gears are integral, be bearing on the protuberance on the basis end that is formed at crank arm.Protuberance is nested and is fixed on an end of crank shaft, and this crank shaft then is rotatably supported on the suspension rod of bicycle frame.
When driving bicycle, sizable masterpiece is used on the various piece of above-mentioned multiple stage gear crank.This masterpiece firmly except the propulsive effort of circumference of gear direction, because the direction of each gear and crank shaft is arranged side by side, therefore also has the effect that is caused by above-mentioned propulsive effort in gear thickness of slab direction.Each gear of gear crank, be necessary to have the above rigidity of setting for the power of this gear thickness direction, therefore, open in the described gear crank of flat 9-86471 communique above-mentioned spy, in order to improve the supporting rigidity of gear, set up connection from the outer end of the protuberance of crank arm the reinforcing member to the periphery edge of external gear.
Moreover, for the supporting rigidity of each gear of improving gear crank, be a plurality of stays of radial elongation from protuberance in the setting of crank arm side, form the structure that supports each gear by these stays.But this exists the problem of the weight that increases crank arm.
And then, normally should be arranged on each gear on this multiple stage gear crank, make and be roughly the ring shape, from the punching press respectively of different plate of material, pressurize again and be processed into.If like this, then can waste and the inboard cooresponding plate of material of ring shape, this also is a problem.
Summary of the invention
The present invention considers the problems referred to above and proposes that its objective is to provide a kind of waste that can reduce plate of material, and can keep the new gear crank for bicycle of rigidity more than regulation of each gear under a plurality of gear shape all-in-one-piece states.
In order to address the above problem, the various technique devices below the present invention has adopted.
The gear crank for bicycle that first aspect of the present invention provided will be arranged side by side from a plurality of gears that outside diameter reduces successively and be integral and the formative gear group, and this gear cluster will be fixedly supported upon on the protuberance of crank arm, it is characterized in that,
In above-mentioned a plurality of gears, selected first gear, when its center overlaps with the center of selected second gear littler than its diameter, inside outshot with the between cog part that can embed second gear, simultaneously, this inside outshot forms the most inboard position of radial direction that is positioned at first gear, and
Above-mentioned first gear near above-mentioned inside outshot, is connected with the gear of contiguous minor diameter one side.
When the center of first gear and second gear overlapped each other, the inside outshot of first gear can just in time embed the between cog part of second gear.In addition, the radial direction that inside outshot is positioned at first gear is the most inboard, and therefore, as mentioned above, when the center of two gears overlapped each other, two parts did not overlap at thickness direction.This expression, above-mentioned first gear and second gear can be cut out by a bulk flitch.Form the punch-out of the between cog part of second gear, become the above-mentioned inside outshot of first gear.
Therefore, at least two gears of the multiple stage gear crank that is made of a plurality of gears can obtain from a bulk flitch, but economical with materials like this, cost-cutting.
In addition, the inside outshot that on first gear, forms, when being connected with the side of the gear of the inboard of contiguous first gear near this inside outshot, the part of the power that first gear can be drawn back from the gear adjacent with its thickness direction is blocked in the gear side of above-mentioned vicinity as counter-force.Like this, can improve for the rigidity that makes first gear in the power of its thickness direction displacement.The result can improve the rigidity of the gear cluster of gear crank for bicycle.
In a preferred embodiment, this gear crank for bicycle, three gears of the inner gear that external gear, diameter is littler than intermediate gear than its little intermediate gear and diameter are arranged side by side and are integral and the formative gear group, and this gear cluster is fixedly supported upon on the protuberance of crank arm;
When inner gear and the coincidence of external gear center, external gear has the inside outshot of the between cog part that can embed inner gear, and simultaneously, this inside outshot forms the most inboard position of radial direction that is positioned at this external gear, and,
The aforementioned external teeth wheel near above-mentioned inside outshot, is connected with the outer lateral side of above-mentioned intermediate gear.
This embodiment is applied in the present invention in the gear crank for bicycle that is arranged side by side three gears.It can have advantage same as described above, and this point can be understood easily.
In a preferred embodiment, the centre hole of above-mentioned intermediate gear, being nested is fixed on the protuberance of above-mentioned crank arm, and simultaneously, above-mentioned inner gear is connected with the inner side surface of above-mentioned intermediate gear.
Like this, do not need other gear support parts are set,, can gear cluster be bearing on the protuberance of crank arm well by intermediate gear.
And then, in a preferred embodiment, the centre hole of above-mentioned inner gear, with the centre hole of above-mentioned intermediate gear, being nested is fixed on the protuberance of above-mentioned crank arm.
Like this, because inner gear and intermediate gear become on the dual protuberance that is bearing in crank arm, therefore can improve the supporting rigidity of gear cluster on crank arm.
The manufacture method of second gear crank for bicycle that the aspect provided of the present invention is the manufacture method of gear crank for bicycle of first aspect of the invention described above, it is characterized in that,
Above-mentioned first gear and second gear are cut out by a bulk flitch.
In a preferred embodiment, aforementioned external teeth wheel and above-mentioned inner gear are cut out by a bulk flitch.
The meaning of this second aspect is from the easy understanding of above-mentioned meaning of first aspect of the invention described above.Moreover first gear and second gear are cut out by a bulk flitch, or external gear and inner gear cut out by a bulk flitch, and do not mean that use constitutes gear crank from the gear cluster that same bulk flitch cuts out.In the gear crank of reality is made, to prepare the gear of a plurality of various sizes as parts, and with they combinations.Zu He gear is not to only limit to be cut out by the identical materials plate like this.But most first gears or external gear make identical shape, and most second gear or inner gear make identical shape.
Other features and advantages of the present invention, by the following detailed description of carrying out with reference to accompanying drawing, will be clearer.
Description of drawings
Fig. 1 is the front elevation of the gear crank for bicycle of one embodiment of the present of invention;
Fig. 2 is the lateral plan of gear crank for bicycle shown in Figure 1;
Fig. 3 is the back view of gear crank for bicycle shown in Figure 1;
Fig. 4 is the section drawing along the IV-IV line of Fig. 1;
Fig. 5 is in gear crank for bicycle shown in Figure 1 is made, and what cut out the used material of the gear of regulation gets the material instruction diagram.
The specific embodiment
Below, with reference to accompanying drawing, the preferred embodiments of the present invention are specifically described.
Fig. 1 is the front elevation of the gear crank for bicycle 1 of one embodiment of the present of invention; Fig. 2 is its lateral plan; Fig. 3 is its back view; Fig. 4 is the section drawing along the IV-IV line among Fig. 1; Fig. 5 gets the instruction diagram of material for material.
As Fig. 2, Fig. 3 and shown in Figure 4, the basic structure of this gear crank for bicycle 1 is, will be as the external gear 10 of first gear of the present invention, diameter is than its little intermediate gear 20, than intermediate gear 20 diameters also little, as three gears of the inner gear 30 of second gear of the present invention, be arranged side by side at its thickness direction and form gear cluster 2, be on the neighboring of protuberance 41 that the shape that is nested is fixed on crank arm 40.
As shown in Figure 4, by with screw 3 with intermediate gear 20 and external gear 10, intermediate gear 20 and inner gear 30 are connected in one respectively with screw 5, external gear 10, intermediate gear 20 and inner gear 30 can be made gear cluster 2.In addition, on the outer lateral side of external gear 10, the lid 50 that utilizes screw 4 to be installed with to prevent chain releasing.Moreover the connection between each gear 10,20,30 is not limited to screw, also can utilize the riveted joint parts to connect.
Said gear group 2 at the centre hole 22,32 with intermediate gear 20 and inner gear 30, is embedded under the state on the neighboring of raised part 41, the medial end riveted and fixed of protuberance 41 can be bearing on the protuberance 41 of crank arm 40.
As mentioned above, the above-mentioned inside outshot 14 of external gear 10 has between cog part 33 corresponding shape with inner gear 30, in addition, the position of the radial direction of above-mentioned inside outshot 14, corresponding with the position of the radial direction of the between cog part 33 of inner gear 30.Like this, as shown in Figure 5, under the situation about overlapping each other at the center that makes external gear 10 and inner gear 30, above-mentioned inside outshot 14 and above-mentioned between cog part 33 can embed mutually.So, in external gear 10, because above-mentioned inside outshot 14 is positioned at radial direction the most inboard of external gear 10, therefore, as shown in Figure 5, when the between cog part 33 of inside outshot 14 that makes external gear 10 and inner gear 30 was chimeric, two gears 10,30 can not overlap.Like this, as can be seen from Figure 5, can obtain external gear 10 and inner gear 30 by a bulk flitch punching press.
Therefore, in a plurality of gears that are set up in parallel of gear crank for bicycle 1 of the present invention, have at least two can obtain by a bulk flitch, consequently, can economical with materials, cost-cutting.
So, on the above-mentioned installation sheet 13 of external gear 10, be positioned near the position in the radial direction outside of above-mentioned inside outshot 14, be connected with the gear of adjacent medial side.Therefore, suppose as with external gear 10 from the masterpiece time spent that intermediate gear 20 draws back, then the part of this power can screw 3 be a fulcrum, by above-mentioned inside outshot 14, be blocked in effectively from the side of screw 3 to the intermediate gear 20 at the position of the inboard of radial direction extension.Like this, can improve installation rigidity with respect to the external force of the thickness direction of external gear 10.
Like this, the present invention can have not only economical with materials, and can improve the fabulous advantage of the gear support rigidity under installing condition.
Certainly, scope of the present invention is not to only limit to the foregoing description, and all changes in the described scope of each claim are included in the scope of the present invention.
The present invention is not the mode that only limits to have three gears, and is applicable to the situation that is arranged side by side the gear more than 4 yet.In the gear more than 4, with the gear selected as first gear, as second gear,, can cut out this first gear and second gear than little any one gear of its diameter by a bulk flitch by adopting the structure of above-mentioned inside outshot 14 and between cog part 33.
In addition, in an embodiment, though with the both sides' of intermediate gear 20 and inner gear 30 centre hole 22,32, on the protuberance 41 that is fixed on crank arm 40 that is nested, still, also can be only with the centre hole of any one gear, on the protuberance 41 that is fixed on crank arm 40 that is nested.
Claims (6)
1. gear crank for bicycle will be arranged side by side from a plurality of gears that outside diameter reduces successively and be integral and the formative gear group, and this gear cluster will be fixedly supported upon on the protuberance of crank arm, it is characterized in that,
In described a plurality of gears, selected first gear, when its center overlaps with the center of selected second gear littler than its diameter, inside outshot with the between cog part that can embed second gear, simultaneously, this inside outshot forms the most inboard position of radial direction that is positioned at this first gear, and
Described first gear near described inside outshot, is connected with the gear of contiguous minor diameter one side.
2. gear crank for bicycle, three gears of the inner gear that external gear, diameter is littler than intermediate gear than its little intermediate gear and diameter are arranged side by side and are integral and the formative gear group, and this gear cluster is fixedly supported upon on the protuberance of crank arm, it is characterized in that
When the center of inner gear and external gear overlapped, external gear had the inside outshot of the between cog part that can embed inner gear, and simultaneously, this inside outshot forms the most inboard position of radial direction that is positioned at this external gear, and,
Described external gear near described inside outshot, is connected with the outer lateral side of described intermediate gear.
3. gear crank for bicycle as claimed in claim 2 is characterized in that, the centre hole of described intermediate gear, and being nested is fixed on the protuberance of described crank arm, and simultaneously, described inner gear is connected with the inner side surface of described intermediate gear.
4. gear crank for bicycle as claimed in claim 3 is characterized in that, the centre hole of described inner gear, and with the centre hole of described intermediate gear, being nested is fixed on the protuberance of described crank arm.
5. the manufacture method of a gear crank for bicycle, this gear crank for bicycle, to be arranged side by side from a plurality of gears that outside diameter reduces successively and be integral and the formative gear group, and this gear cluster is fixedly supported upon on the protuberance of crank arm, it is characterized in that, in described a plurality of gears, selected first gear, when its center overlaps with the center of selected second gear littler than its diameter, inside outshot with the between cog part that can embed second gear, simultaneously, this inside outshot forms the most inboard position of radial direction that is positioned at first gear, and, described first gear, near described inside outshot, be connected with the gear of contiguous minor diameter one side
Described first gear and second gear are cut out by a bulk flitch.
6. the manufacture method of a gear crank for bicycle, this gear crank for bicycle, with external gear, diameter is than its little intermediate gear, and three gears of the diameter inner gear littler than intermediate gear are arranged side by side and are integral and the formative gear group, and this gear cluster is fixedly supported upon on the protuberance of crank arm, it is characterized in that, when the center of inner gear and external gear overlaps, external gear has the inside outshot of the between cog part that can embed inner gear, simultaneously, this inside outshot forms the most inboard position of radial direction that is positioned at this external gear, and, described external gear, near described inside outshot, be connected with the outer lateral side of described intermediate gear, described external gear and described inner gear are cut out by a bulk flitch.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002256580A JP4022454B2 (en) | 2002-09-02 | 2002-09-02 | Bicycle gear crank and manufacturing method thereof |
| JP2002256580 | 2002-09-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1486903A true CN1486903A (en) | 2004-04-07 |
| CN1247408C CN1247408C (en) | 2006-03-29 |
Family
ID=32061764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03156283 Expired - Fee Related CN1247408C (en) | 2002-09-02 | 2003-09-02 | Gear crank for bicycle and producing method thereof |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4022454B2 (en) |
| CN (1) | CN1247408C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101121432B (en) * | 2006-08-03 | 2013-04-17 | 坎培诺洛有限公司 | Right crank arm assembly for a bicycle and crank arm and front sprocket thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4034252B2 (en) | 2003-09-29 | 2008-01-16 | 株式会社林技術研究所 | Automotive sun visor |
| JP2006160139A (en) * | 2004-12-09 | 2006-06-22 | Shimano Inc | Gear crank for bicycle |
| JP2010058589A (en) | 2008-09-02 | 2010-03-18 | Sugino Engineering:Kk | Bicycle gear crank |
-
2002
- 2002-09-02 JP JP2002256580A patent/JP4022454B2/en not_active Expired - Fee Related
-
2003
- 2003-09-02 CN CN 03156283 patent/CN1247408C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101121432B (en) * | 2006-08-03 | 2013-04-17 | 坎培诺洛有限公司 | Right crank arm assembly for a bicycle and crank arm and front sprocket thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4022454B2 (en) | 2007-12-19 |
| JP2004090824A (en) | 2004-03-25 |
| CN1247408C (en) | 2006-03-29 |
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| C14 | Grant of patent or utility model | ||
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