CN101734336B - Bicycle fluted disc with guiding structures - Google Patents
Bicycle fluted disc with guiding structures Download PDFInfo
- Publication number
- CN101734336B CN101734336B CN2008101791917A CN200810179191A CN101734336B CN 101734336 B CN101734336 B CN 101734336B CN 2008101791917 A CN2008101791917 A CN 2008101791917A CN 200810179191 A CN200810179191 A CN 200810179191A CN 101734336 B CN101734336 B CN 101734336B
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- Prior art keywords
- chain
- auxiliary flute
- fluted disc
- dodging
- groove
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Abstract
The invention relates to a bicycle fluted disc with guiding structures, which is provided with a large fluted disc and a small fluted disc which are combined and rotate concentrically, and the two fluted discs are circularly provided with a plurality of tooth parts; the large fluted disc is provided with a plurality of guiding structures; each guiding structures comprises an auxiliary groove; the auxiliary groove is adjacent to the tooth parts of the large fluted disc; the auxiliary groove extends to the outer periphery of the large fluted disc and is in an opening shape; the auxiliary groove is provided with a bearing surface which is provided with two concave parts and a convex part; the concave parts correspond to a combination part of a chain; and the convex part corresponds to a clamping part of the chain.
Description
Technical field
The present invention relates to a kind of bicycle crank, refer to a kind of bicycle crank especially with guiding structural.
Background technology
Many bicycles are for the road conditions in response to the various gradients, the capital is provided with the fluted disc of different sizes, and utilize chain to cooperate the variation of forward and backward gear ratio to produce effect laborsaving or that quicken, and why chain can switch between different sizes, height fluted disc, mainly be to utilize moving of change-speed box and the skew of pulling chain, to switch the position of chain.
With reference to US5458543 number " BICYCLE MULTIPLE SPROCKET ASSEMBLY " patent case of U.S. Patent number, as its Fig. 4 and shown in Figure 5, the multiple bitch chain wheel apparatus of bicycle includes bitch chain wheel 2,3 and chain sheet support portion 12, when chain C when being transformed into big footpath bitch chain than path bitch chain wheel 2 and taking turns 3, described chain sheet support portion 12 can be used to support the chain sheet edge of described chain C, in addition, one recess 13 is formed on described bitch chain wheel 3, comprises that a cascaded surface 13a abuts against the bearing surface 12a of described chain sheet support portion 12.
In the above-mentioned existing structure, support portion 12 is the surfaces that are installed at big footpath bitch chain wheel 3, the surface at big footpath bitch chain wheel 3 is protruded in support portion 12, after chain C switches bitch chain wheel 2,3 for many times, support portion 12 gets loose or is shifted with easy formation of the joint of recess 13, cause support portion 12 and recess 13 angles to change, make chain C can't be smooth and accurate cochain to big footpath bitch chain wheel 3, and support portion 12 and recess 13 formed level and smooth curves can't guarantee that also chain C snaps in the tooth portion of big footpath bitch chain wheel 3 with correct phase place; The support portion 12 that installs additional increases the weight and the volume of car body on foot, obviously violates the demand of pursuing the lightweight bicycle now.
Moreover, chain C was switching the bitch chain wheel at 2,3 o'clock, chain C is close to recess 13 and chain C is switched in support portion 12, so for a long time in recess 13 and support portion 12 auxiliary switching positions, after the abrasion of being accumulated over a long period in recess 13 and support portion 12, in order to do making chain C be difficult to switch bitch chain wheel 2,3, the life-span of reducing the bitch chain wheel apparatus.
Moreover, chain C breaks away from the path bitch chain to take turns 2 o'clock, and chain C produces with the surface of big footpath bitch chain wheel 3 easily and interferes, and caused the chain C can't the fast speed conversion, and chain C is subjected to 3 frictions of bitch chain wheel through regular meeting to be interfered, and can not switch smoothly.For the problems referred to above, urgently remain the improvement necessity.
Therefore, the present invention's problem of wanting to get rid of or alleviating prior art at least and met with.
Summary of the invention
The technical matters that institute of the present invention desire solves is to provide a kind of bicycle crank with guiding structural at the above-mentioned disappearance of prior art existence.
Main purpose of the present invention is, auxiliary flute is to install the strut member of any protrusion at large fluted disc additional, can not increase the weight and the volume of fluted disc, meet the weight-saving demand, and when chain entered auxiliary flute, the recess of described continuing surface was with respect to the joint portion of outer chain sheet, and the protuberance of continuing surface is with respect to the card division of outer chain sheet, and described card division does not contact with outer chain sheet, with the phase place of correcting outer chain sheet.
Secondary objective of the present invention is that wherein said guiding structural is buried two additional pins underground at contiguous auxiliary flute place, to slow down the chain wear auxiliary flute, increases the service life of fluted disc.
Another object of the present invention is to, chain breaks away from small tooth plate and slips into the groove of dodging, and reduces the interference on chain and large fluted disc surface, makes the switching of chain more smooth and easy.
For achieving the above object, the technical solution used in the present invention comprises:
A kind of bicycle crank with guiding structural, it has a large fluted disc and a small tooth plate, described large fluted disc and small tooth plate combine and with concentric running, and two fluted discs all are equipped with several tooth portions, it is characterized in that: have several guiding structurals on the described large fluted disc, described guiding structural includes:
One auxiliary flute, tooth portion in abutting connection with large fluted disc, described auxiliary flute extends to described large fluted disc outer peripheral edges and is open shape, described auxiliary flute forms a continuing surface, described continuing surface has two recesses and a protuberance, the joint portion of the corresponding chain of described recess, the card division of the corresponding chain of described protuberance;
One groove of dodging, the described groove of dodging is located at the rear of described auxiliary flute, and the described groove of dodging extends to inner peripheral and is open shape, the described groove of dodging has first end and second end, the contiguous described auxiliary flute of second end of the described groove of dodging, the degree of depth of first end of the described groove of dodging is less than the degree of depth of second end of the described groove of dodging, and the profile of described outer chain sheet is less than the formed sinking space of the groove of dodging.
For achieving the above object, the technical solution used in the present invention also comprises:
A kind of bicycle crank with guiding structural, it has a large fluted disc and a small tooth plate, described large fluted disc and small tooth plate combine and with concentric running, and two fluted discs all are equipped with several tooth portions, it is characterized in that: have several guiding structurals on the described large fluted disc, described guiding structural includes:
An auxiliary flute, in abutting connection with the tooth portion of large fluted disc, described auxiliary flute extends to outer peripheral edges and is open shape, and described auxiliary flute forms a continuing surface;
One groove of dodging, the described groove of dodging is located at the rear of described auxiliary flute, and the described groove of dodging extends to inner peripheral and is open shape, the described groove of dodging has first end and second end, the contiguous described auxiliary flute of second end of the described groove of dodging, the degree of depth of first end of the described groove of dodging is less than the degree of depth of second end of the described groove of dodging, and the profile of described outer chain sheet is less than the formed sinking space of the groove of dodging;
Two additional pins are embedded on the described large fluted disc, and two additional pins are respectively in abutting connection with described auxiliary flute, and the described continuing surface of outer cause of described additional pin stretches into described auxiliary flute, for the joint portion contact of chain.
Compared with prior art, the beneficial effect that has of the present invention is:
1. " bicycle crank " of the present invention with guiding structural, wherein auxiliary flute is to install the strut member of any protrusion at large fluted disc additional, can not increase the weight and the volume of fluted disc, meet the weight-saving demand, and when chain entered auxiliary flute, the recess of described continuing surface was with respect to the joint portion of outer chain sheet, and the protuberance of continuing surface is with respect to the card division of outer chain sheet, and described card division does not contact with outer chain sheet, with the phase place of correcting outer chain sheet.
2. " bicycle crank with guiding structural " of the present invention, wherein said guiding structural is buried two additional pins underground at contiguous auxiliary flute place, to slow down the chain wear auxiliary flute, increases the service life of fluted disc.
3. " bicycle crank with guiding structural " of the present invention, wherein chain disengaging small tooth plate slips into the groove of dodging, and reduces the interference on chain and large fluted disc surface, makes the switching of chain more smooth and easy.
Description of drawings
Fig. 1 is the stereo appearance figure of bicycle crank of the present invention;
Fig. 2 is the three-dimensional exploded view of bicycle crank of the present invention;
Fig. 3 is the front elevation of bicycle crank of the present invention;
Fig. 4 is the partial enlarged drawing of Fig. 3 of the present invention;
The section-drawing that Fig. 5 is got along the 5-5 hatching for Fig. 3 of the present invention;
Fig. 6 is the continuity of Fig. 5, the scheme drawing that the expression chain switches;
Fig. 7 is the stereo appearance figure of second embodiment of the invention;
Fig. 8 is the generalized section of second embodiment of the invention.
Description of reference numerals: 10-large fluted disc; 11-tooth portion; The 12-outer peripheral edges; The 13-inner peripheral; The 20-small tooth plate; 21-tooth portion; The 30-guiding structural; The 31-connecting portion; The 40-auxiliary flute; 401 first ends; 402-second end; The 41-continuing surface; The 411-recess; The 412-protuberance; The 42-additional pin; The 50-groove of dodging; 501-first end; 502-second end; First section of 51-; Second section of 52-; The 60-chain; The 61-outer chain sheet; The 611-card division; The 612-joint portion; The 62-inner chain sheet; The 70-groove of dodging; 701-first end; 702-second end; The 71-inclined-plane; The 80-auxiliary flute; The 81-inclined-plane; The L-width; The S-spacing.
The specific embodiment
Relevant the technology used in the present invention, means and effect thereof, lift a preferred embodiment now and cooperate graphic detailed description as after, this only for the usefulness of explanation, is not subjected to the restriction of this kind structure in patent application.
Please refer to Fig. 1 and Fig. 2, be stereo appearance figure of the present invention and three-dimensional exploded view, a large fluted disc 10 and a small tooth plate 20 have been the present invention includes, described large fluted disc 10 and small tooth plate 20 are provided in a side of concentric place, and chain be located at two fluted discs 10,20 one of them, and chain is the switching that is controlled at 20 of large fluted disc 10 and small tooth plates by change-speed box, large fluted disc 10 has several guiding structurals 30, the switching of described guiding structural 30 auxiliary chains between fluted disc is more smooth and easy, and can reduce the abrasion of 10 of chain and large fluted discs.
With reference to Fig. 2 to Fig. 4, described large fluted disc 10 and small tooth plate 20 are to be incorporated into together with conjunction, and large and small fluted disc 10,20 can be with concentric running, large and small fluted disc 10,20 is equipped with several protruding tooth portions 11,21, described tooth portion the 11, the 21st is used for chain 60 engagements with bicycle, large fluted disc 10 is called the place ahead with chain 60 working direction, steps back direction with chain 60 and is called the rear, and large fluted disc 10 has outer peripheral edges 12 and inner peripheral 13.Wherein chain 60 has outer chain sheet 61 and the inner chain sheet 62 mutual institutes that connect and constitutes, and outer chain sheet 61 and inner chain sheet 62 include card division 611 and joint portion 612, and card division 611 is to supply tooth portion 11,21 fixing that stretches through.
Described guiding structural 30 is provided in a side of the surface of large fluted disc 10 with respect to small tooth plate 20, and guiding structural 30 includes an auxiliary flute 40 and a groove 50 of dodging, and described guiding structural 30 switches in 10,20 of two fluted discs smoothly for chains 60.
The described groove 50 of dodging is provided in a side of the rear of described auxiliary flute 40, and the described groove 50 of dodging is to extend to the inner peripheral 13 of large fluted disc 10 and be open shape, the described groove 50 of dodging has first end 501 and second end 502, chain 60 is advanced toward second end 502 by first end 501, second end, 502 contiguous auxiliary flutes 40, have one first section 51 and 1 second section 52 in the described groove 50 of dodging, second section 52 end that is formed on second end 502, the groove 50 of dodging is step shape along the direction that chain 60 advances, and the described degree of depth of dodging groove 50 first ends 501 forms described first section 51 and described second section 52 less than the degree of depth of second end 502.Chain 60 is when switching to large fluted disc 10, at first slip into the groove 50 of dodging, the groove 50 of dodging can reduce the interference on chain 60 and large fluted disc 10 surfaces, and the groove 50 profile sizes of dodging are enough to fall in the groove 50 of dodging for the outer chain sheet 61 or the inner chain sheet 62 of described chain 60, and chain 60 at first enters first section 51 and enters second section 52 again.
The described auxiliary flute 40 and the groove 50 of dodging are that the milling of being separated by forms, and guiding structural 30 forms a junction 31 at the auxiliary flute 40 and 50 parts without milling of groove of dodging.
With reference to Fig. 4 to Fig. 6, when chain 60 is when being controlled at small tooth plate 20 toward large fluted disc 10 switchings by change-speed box, at first chain 60 can enter in the groove 50 of dodging by disengaging small tooth plate 20, in order to do the interference that makes chain 60 minimizings with large fluted disc 10 surfaces, make chain 60 at two fluted discs 10,20 switching is more smooth and easy, and the sinking space that the profile of described chain 60 outer chain sheets 61 forms less than the groove 50 of dodging, chain 60 is by the groove 50 of dodging during to connecting portion 31 then, connecting portion 31 without milling backs down chain 60, falls into auxiliary flute 40 to prevent chain 60 in the off-square phase place.The width L of wherein said connecting portion 31 makes chain 60 fall into auxiliary flute 40 with fixing phase place less than the interval S of 60 liang of adjacent outer chain sheets 61 of chain.Chain 60 is by behind the connecting portion 31, enter auxiliary flute 40 subsequently, the card division 611 of chain 60 and joint portion 612 can fall into the position of two recesses 411 and protuberance 412 just, and the joint portion 612 of chain 60 is positioned at recess 411 simultaneously, and the card division 611 of chain 60 is positioned at protuberance 412; And the joint portion 612 of chain 60 directly contacts with two additional pins 42, the card division 611 of chain 60 has spacing with 412 of protuberances and does not contact simultaneously, so that two additional pins 42 can contact with the joint portion 612 of chain 60 really, two additional pins 42 act as the wearing and tearing that slow down auxiliary flute 40, increase the service life of large fluted disc 10.Last chain 60 can switch tooth portion 11 engagements that snap in large fluted disc 10 along auxiliary flute 40.
With reference to Fig. 7 and Fig. 8, be the stereo appearance figure and the scheme drawing of second embodiment of the invention.Second embodiment is roughly identical with first embodiment, it is characterized in that, the degree of depth of groove 70 first ends 701 of dodging forms an inclined-plane 71 less than the degree of depth of second end 702, and the direction that described auxiliary flute 80 advances along chain 60 and form an inclined-plane 81 can be advanced in dodge groove 70 and auxiliary flute 80 more smoothly for chain 60.
Can summarize the present invention with regard to the above and have following advantage:
1. " bicycle crank " of the present invention with guiding structural, wherein auxiliary flute is to install the strut member of any protrusion at large fluted disc additional, can not increase the weight and the volume of fluted disc, meet the weight-saving demand, and when chain entered auxiliary flute, the recess of described continuing surface was with respect to the joint portion of outer chain sheet, and the protuberance of continuing surface is with respect to the card division of outer chain sheet, and described card division does not contact with outer chain sheet, with the phase place of correcting outer chain sheet.
2. " bicycle crank with guiding structural " of the present invention, wherein said guiding structural is buried two additional pins underground at contiguous auxiliary flute place, to slow down the chain wear auxiliary flute, increases the service life of fluted disc.
3. " bicycle crank with guiding structural " of the present invention, wherein chain disengaging small tooth plate slips into the groove of dodging, and reduces the interference on chain and large fluted disc surface, makes the switching of chain more smooth and easy.
More than explanation is just illustrative for the purpose of the present invention; and nonrestrictive, those of ordinary skills understand, under the situation of the spirit and scope that do not break away from claim and limited; can make many modifications, variation or equivalence, but all will fall within protection scope of the present invention.
Claims (8)
1. bicycle crank with guiding structural, it has a large fluted disc and a small tooth plate, described large fluted disc and small tooth plate combine and with concentric running, and two fluted discs all are equipped with several tooth portions, it is characterized in that: have several guiding structurals on the described large fluted disc, described guiding structural includes:
One auxiliary flute, tooth portion in abutting connection with large fluted disc, described auxiliary flute extends to described large fluted disc outer peripheral edges and is open shape, described auxiliary flute forms a continuing surface, described continuing surface has two recesses and a protuberance, the joint portion of the corresponding chain of described recess, the card division of the corresponding chain of described protuberance;
One groove of dodging, the described groove of dodging is located at the rear of described auxiliary flute, and the described groove of dodging extends to inner peripheral and is open shape, the described groove of dodging has first end and second end, the contiguous described auxiliary flute of second end of the described groove of dodging, the degree of depth of first end of the described groove of dodging is less than the degree of depth of second end of the described groove of dodging, and the profile of described outer chain sheet is less than the formed sinking space of the groove of dodging.
2. the bicycle crank with guiding structural according to claim 1, it is characterized in that: described guiding structural also comprises two additional pins, these two additional pins are embedded on the described large fluted disc, and two additional pins are respectively in abutting connection with described auxiliary flute, the described continuing surface of outer cause of described additional pin stretches into described auxiliary flute, for the joint portion contact of chain;
The formed profile in the joint portion of described auxiliary flute profile and chain one side and card division is approaching, described auxiliary flute has first end and second end, the tooth portion of the contiguous described large fluted disc of second end, the degree of depth of auxiliary flute first end is less than the degree of depth of second end, described two recesses are formed on the two ends of described protuberance, when chain fell into described auxiliary flute, described protuberance did not contact with the card division of chain.
3. the bicycle crank with guiding structural according to claim 1, it is characterized in that: described guiding structural has a junction at described auxiliary flute and described dodging between groove, the extension that links to each other with described large fluted disc of described connecting portion surface, the width of described connecting portion is less than the spacing of chain two adjacent outer chain sheets.
4. the bicycle crank with guiding structural according to claim 1 and 2 is characterized in that: the wall angle of the continuing surface of described auxiliary flute and described auxiliary flute is not more than right angle 90 degree.
5. bicycle crank with guiding structural, it has a large fluted disc and a small tooth plate, described large fluted disc and small tooth plate combine and with concentric running, and two fluted discs all are equipped with several tooth portions, it is characterized in that: have several guiding structurals on the described large fluted disc, described guiding structural includes:
An auxiliary flute, in abutting connection with the tooth portion of large fluted disc, described auxiliary flute extends to outer peripheral edges and is open shape, and described auxiliary flute forms a continuing surface;
One groove of dodging, the described groove of dodging is located at the rear of described auxiliary flute, and the described groove of dodging extends to inner peripheral and is open shape, the described groove of dodging has first end and second end, the contiguous described auxiliary flute of second end of the described groove of dodging, the degree of depth of first end of the described groove of dodging is less than the degree of depth of second end of the described groove of dodging, and the profile of described outer chain sheet is less than the formed sinking space of the groove of dodging;
Two additional pins are embedded on the described large fluted disc, and two additional pins are respectively in abutting connection with described auxiliary flute, and the described continuing surface of outer cause of described additional pin stretches into described auxiliary flute, for the joint portion contact of chain.
6. the bicycle crank with guiding structural according to claim 5, it is characterized in that: the formed profile in joint portion and card division of described auxiliary flute profile and chain one side is approaching, described auxiliary flute has first end and second end, the tooth portion of the contiguous described large fluted disc of second end, the degree of depth of auxiliary flute first end is less than the degree of depth of second end, the shape of the corresponding chain of described continuing surface forms a recess and a protuberance, described two recesses are formed on the two ends of described protuberance, the joint portion of the corresponding chain of described recess, the card division of the corresponding chain of described protuberance, described protuberance does not contact with the card division of chain.
7. the bicycle crank with guiding structural according to claim 5, it is characterized in that: described guiding structural has a junction at described auxiliary flute and described dodging between groove, the extension that links to each other with described large fluted disc of described connecting portion surface, the width of described connecting portion is less than the spacing of chain two adjacent outer chain sheets.
8. according to claim 5 or 6 described bicycle cranks with guiding structural, it is characterized in that: the wall angle of the continuing surface of described auxiliary flute and described auxiliary flute is not more than right angle 90 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101791917A CN101734336B (en) | 2008-11-27 | 2008-11-27 | Bicycle fluted disc with guiding structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101791917A CN101734336B (en) | 2008-11-27 | 2008-11-27 | Bicycle fluted disc with guiding structures |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101734336A CN101734336A (en) | 2010-06-16 |
| CN101734336B true CN101734336B (en) | 2011-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101791917A Expired - Fee Related CN101734336B (en) | 2008-11-27 | 2008-11-27 | Bicycle fluted disc with guiding structures |
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| Country | Link |
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| CN (1) | CN101734336B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9701364B2 (en) * | 2013-05-17 | 2017-07-11 | Shimano Inc. | Bicycle sprocket and bicycle crank assembly |
| US10625821B2 (en) * | 2017-03-17 | 2020-04-21 | Shimano Inc. | Bicycle sprocket and bicycle sprocket assembly |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4526558A (en) * | 1983-11-03 | 1985-07-02 | Durham Roger O | Chain engagement slot for bicycle sprockets |
| CN1091373A (en) * | 1992-12-28 | 1994-08-31 | 株式会社森.森图尔 | Multistep chain gear used in bike |
| US5464373A (en) * | 1994-11-15 | 1995-11-07 | Cyclone Precision Inc. | Bicycle sprocket assembly with a chain guiding means |
| CN1337340A (en) * | 2000-06-30 | 2002-02-27 | 株式会社岛野 | Bicycle chain-wheel with chain-support rim |
| CN1342851A (en) * | 2000-09-13 | 2002-04-03 | 株式会社岛野 | Bicycle chain wheel |
| CN1605771A (en) * | 2003-10-10 | 2005-04-13 | Sram德国有限公司 | Low-noise chainwheel |
-
2008
- 2008-11-27 CN CN2008101791917A patent/CN101734336B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4526558A (en) * | 1983-11-03 | 1985-07-02 | Durham Roger O | Chain engagement slot for bicycle sprockets |
| CN1091373A (en) * | 1992-12-28 | 1994-08-31 | 株式会社森.森图尔 | Multistep chain gear used in bike |
| US5464373A (en) * | 1994-11-15 | 1995-11-07 | Cyclone Precision Inc. | Bicycle sprocket assembly with a chain guiding means |
| CN1337340A (en) * | 2000-06-30 | 2002-02-27 | 株式会社岛野 | Bicycle chain-wheel with chain-support rim |
| CN1342851A (en) * | 2000-09-13 | 2002-04-03 | 株式会社岛野 | Bicycle chain wheel |
| CN1605771A (en) * | 2003-10-10 | 2005-04-13 | Sram德国有限公司 | Low-noise chainwheel |
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| Publication number | Publication date |
|---|---|
| CN101734336A (en) | 2010-06-16 |
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