CN2584945Y - Chain wheel driving device - Google Patents
Chain wheel driving device Download PDFInfo
- Publication number
- CN2584945Y CN2584945Y CN 02289589 CN02289589U CN2584945Y CN 2584945 Y CN2584945 Y CN 2584945Y CN 02289589 CN02289589 CN 02289589 CN 02289589 U CN02289589 U CN 02289589U CN 2584945 Y CN2584945 Y CN 2584945Y
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- CN
- China
- Prior art keywords
- fluted disc
- radius
- pitch
- tooth
- circular
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a chain wheel driving device for manpower pedals such as bicycle class. A fluted disc is composed of circular section arcs AB and DC with R radius; a section ellipse is composed of circular section arcs AD and BC with r radius; the teeth distribution of the AB part and the CD part is the same with that of the circular fluted disc with R pitch circle radius; the teeth distribution of the BC part and the DA part is the same with that the circular fluted disc with r pitch circle radius. Parameters of the fluted disc are figured out by selecting the total number of teeth of the fluted disc Z1, the number of teeth Z2 of the circular fluted disc with r pitch circle radius, and pitch P. The instantaneous driving ratio of the designed and manufactured chain wheel driving device composed of the elliptic or long circular fluted disc, chains and a fly wheel changes periodically. When the degree suitable for human body to use force is better and the effective force generated by the force of people pedaling pedals by feet is larger, the corresponding instantaneous driving ratio is also larger. In reverse, the instantaneous driving ratio is also smaller. The utility model can automatically harmonize people-machine relationship, fully exert and effectively utilize human physical energy. The chain wheel driving device has the advantages of labor saving and high efficiency.
Description
Technical field
The utility model relates to a kind of sprocket transmission device, is meant that specifically the manpower that leans on as bicycle and so on promotes the device of sprocket driving with pedal.
Background technique
Well-known bicycle, pedicab and match bicycle, and the sprocket transmission device of some bodybuilding equipment, it mainly is made up of crank throw, fluted disc (drive sprocket), chain, flywheel (by movable sprocket) etc., wherein fluted disc is circular, and the circular fluted disc and the instantaneous transmission ratio of flywheel are invariable.This transmission device in use, two pin of human alternately firmly Pedalling rotate crank throw and fluted disc, every process that pin is finished once to exert oneself, crank throw and fluted disc rotate 180 °.Crank throw is different in different angular orientation people's the effective force that pedal power produced, and the degree that suitable human body is exerted oneself also is different.When crank throw is near the vertical position, people's the effective force that pedal power produced is very little, and, because the leg that the people lifts is too crooked, be not suitable for firmly Pedalling, also be not suitable for utilizing human body gravity to press down pedal, the degree that suitable human body is exerted oneself is the poorest, going up a slope, against the wind, under the big situation of resistance such as acceleration, even motionless " dead point " can occur pedaling.For the fast as far as possible crank throw that makes turns near the vertical position, save people's muscle power and avoid occurring manpower and pedal motionless " dead point ", then need instantaneous transmission ratio little (that is: the fluted disc radius is little); In the time of near crank throw is in horizontal position, people's the effective force maximum that pedal power produced, the most suitable human body of degree of people's leg bending firmly also is fit to utilize human body gravity to press down pedal.In order better to send out brightness, effectively to utilize people's muscle power, raise the efficiency, then need instantaneous transmission ratio big (that is: the fluted disc radius is big).Obviously, circular fluted disc can't satisfy the needs (can only take into account, perhaps satisfy on the one hand, abandon on the other hand, so Applicable scope be also very narrow) of above different situations.Thereby prior art to exist people one office be not harmony, the defective of people's muscle power can not fully effectively be utilized and bring into play to waste people's muscle power.
The model utility content
The purpose of this utility model is to overcome the defective of prior art, and a kind of suitable human body degree height of exerting oneself is provided, and working efficiency is also high, can make full use of and bring into play the sprocket transmission device of people's pedal power.
The utility model sprocket transmission device, comprise fluted disc, wherein fluted disc is oval-shaped, it is oval to be by radius that the pitch circle arc AB of R and pitch circle arc AD that DC, radius are r and BC four parts are formed joint, the distribution of tooth is corresponding also to be made up of AB, BC, CD, DA four parts, the CD part of AB part and symmetry, the distribution of tooth and Pitch radius are that the circular fluted disc of R is identical, the DA part of BC part and symmetry, the distribution of tooth and Pitch radius are that the circular fluted disc of r is identical, A, B, 4 of C, D are the point of contact of pitch circle arc, and, all at the teeth groove center.The parameter of fluted disc is:
Total tooth number Z of selected fluted disc
1With Pitch radius be the tooth number Z of the circular fluted disc of r
2, Z
1, Z
2Be necessary for even number;
The pitch P of selected chain, then
r＝P/2sin(180°/Z
2)；
Be to select the point of contact A of two pitch circle arcs on the circumference of r in Pitch radius again, then radius is the number of teeth on the pitch circle arc AB (CD) of R
Z
3＝[Z
1-(Z
2-4n)]/2，
Wherein n is that selected point of contact A is the starting point A of the semi-circumference of r apart from radius
0Pitch number, a plurality of selections are arranged; And
R=P/2sin[n360 °/(Z
2* Z
3)]; Then
The center of fluted disc and radius are the distance of the center of circle on major axis of the pitch circle arc of r
L＝(R-r)×sin(n360°/Z
2)。
The utility model sprocket transmission device, wherein total tooth number Z of fluted disc
1Be 16～78.
The utility model sprocket transmission device, wherein also comprise another kind of fluted disc, be oblong, by AB, CD two straight lines and radius be BC, the DA two pitch circle arcs of r tangent to form joint oval, the distribution of tooth is corresponding also to be made up of AB, BC, CD, DA four parts, the CD part of AB part and symmetry, the distribution of tooth is identical with tooth bar, and the DA part of BC part and symmetry, the distribution of tooth and Pitch radius are that the circular fluted disc of r is identical, A, B, C, D are the point of contact of pitch circle arc and straight line, and are the centers of teeth groove.The parameter of fluted disc is:
Total tooth number Z of selected fluted disc
1With Pitch radius be the tooth number Z of the circular fluted disc of r
2, Z
1, Z
2Be necessary for even number;
The pitch P of selected chain, then
r＝P/2sin(180°/Z
2)；
The number of teeth on straight line AB or the DC is:
Z
3＝(Z
1-Z
2)/2，
Then the center of fluted disc and radius are the distance of the center of circle on major axis of the pitch circle arc of r
L＝P×Z
3。
The instantaneous transmission ratio of the sprocket transmission device that ellipse that the utility model manufactures and designs or long-round-shape fluted disc and chain, flywheel are formed is cyclically-varying.In the time of near crank throw is in the vertical position, on the fluted disc of oval (or long-round-shape) with the overmask point radius minimum of chain, it is the instantaneous transmission ratio minimum, in the time of near crank throw is in horizontal position, on the fluted disc of oval (or long-round-shape) with the overmask point radius maximum of chain, be the instantaneous transmission ratio maximum, thereby satisfied the needs of different situations, overcome the defective that prior art exists.
Description of drawings
Fig. 1 is the utility model sprocket transmission device structural representation;
Fig. 2 is oval fluted disc structural representation;
Fig. 3 is for determining the schematic diagram of n numerical value;
Fig. 4 is crank throw and fluted disc mounting point schematic representation;
Fig. 5 is a long-round-shape fluted disc structural representation.
Embodiment
As shown in Figure 1, the structural parameter of fluted disc 1 are to determine like this, with the bicycle chain wheel transmission device is example, as shown in Figure 2, the joint ellipse of fluted disc 1 is combined by four sections pitch circle orphans of two different radiis, i.e. AB, BC, CD, DA, and wherein AB and CD radius corresponding are R, corresponding center of circle H and G on the elongation line of minor axis, i.e. AH=BH=DG=CG=R; BC and AD radius corresponding are r, i.e. AE=DE=BF=CF=r, and corresponding center of circle E and F are on major axis; OE=OF=L, O are the center of rotation of fluted disc 1; A, B, C, D are the point of contact, and the distribution of pitch circle arc AB and DC part tooth and Pitch radius are that the circular fluted disc of r is identical, and the distribution of pitch circle arc AD and BC part tooth and Pitch radius are that the circular fluted disc of r is identical, with reference to the standard design of fluted disc.Total tooth number Z according to the earlier selected fluted disc 1 of purposes needs
1, selected again Pitch radius is the tooth number Z of the circular fluted disc of r
2, should be noted that Z
1And Z
2It must be even number.Obviously, Z
2Multiple choices can be arranged, but optimal selection is 1.1＜Z
1/ Z
2＜1.4.According to above selection, obtain tooth number Z on AB or the CD pitch circle arc by following formula
3, promptly
Z
3＝[Z
1-(Z
2-4n)]/2
From Fig. 2, Fig. 3 as seen, n is that selected point of contact A is the starting point A of the semi-circumference of r apart from radius in the following formula
0Pitch number, the A point may be selected in an A
1, A
2, A
3..., a plurality of selections are arranged, these points are the point of contact, are again the central points of teeth groove.
Obtain R by following formula again, r and L, promptly
r＝P/2sin(180°/Z
2)
R＝P/2sin[n360°/(Z
2×Z
3)]
L＝(R-r)×sin(n360°/Z
2)。
In the present embodiment, selected Z
1=50, Z
2=40, P=12.7mm, point of contact A are the A of n=2
2The point; Thereby try to achieve: Z
3=9, r=80.9mm, R=181.95mm, L=31.22mm; Can also design and manufacture oval-shaped fluted disc 1.
By shown in Figure 4, the mounting point of crank throw 4 is to determine like this: when crank throw 4 is in vertical position on the state, the fluted disc 1 of oval (or long-round-shape) and the overmask point A ' of chain 2 are just in time on the minor axis of oval (or long-round-shape) fluted disc 1, at this moment, the angle between the minor axis of crank throw 4 and ellipse (or long-round-shape) fluted disc 1 is the optimum embedding angle degree.
Long-round-shape fluted disc 5 structures are seen shown in Figure 5.AB, CD two straight lines, AE=DE=BF=CF=r, OE=OF=L, O are center of rotation.
Oval (or long-round-shape) fluted disc changes the elasticity of chain, is not having on the rickshaw of tight sprocket wheel, the manual machine tight sprocket wheel to be installed preferably.
Sprocket transmission device of the present utility model for the match bicycle, can shorten starting, time for acceleration, improves the speed of a motor vehicle; For the multi-change speed bicycle, can reduce the quantity of progression, minimizing fluted disc and sprocket wheel; For ordinary bicycle, the people can feel brisk and not be in a hurry; For gymnastic apparatus, can effectively improve " dead point " influence to the people.
Claims (4)
1, a kind of sprocket transmission device, comprise fluted disc, it is oval to it is characterized in that described fluted disc (1) is by radius that the pitch circle arc AB of R and pitch circle arc AD that DC, radius are r and BC four parts are formed joint, the distribution of tooth is corresponding also to be made up of AB, BC, CD, DA four parts, the CD part of AB part and symmetry, the distribution of tooth and Pitch radius are that the circular fluted disc of R is identical, the DA part of BC part and symmetry, the distribution of tooth and Pitch radius are that the circular fluted disc of r is identical, A, B, 4 of C, D are the point of contact of pitch circle arc, and all at the teeth groove center, the parameter of fluted disc is:
Total tooth number Z of selected fluted disc (1)
1With Pitch radius be the tooth number Z of the circular fluted disc of r
2, Z
1, Z
2Be necessary for even number;
The pitch P of selected chain (2), then
r＝P/2sin(180°/Z
2)；
Be the point of contact A that selects two pitch circle arcs on the circumference of r at radius again, then radius is the pitch circle arc AB of R or the number of teeth on the DC
Z
3＝[Z
1-(Z
2-4n)]/2，
Wherein n is that selected point of contact A is the starting point A of the semi-circumference of r apart from radius
0Pitch number, a plurality of selections are arranged; And
R=P/2sin[n360 °/(Z
2* Z
3)]; Then
The center of fluted disc and radius are the distance of the center of circle on major axis of the pitch circle arc of r
L＝(R-r)×sin(n360°/Z
2)。
2, sprocket transmission device according to claim 1 is characterized in that the total tooth number Z on the described fluted disc (1)
1Be 16～78.
3, a kind of sprocket transmission device, also comprise another kind of fluted disc, it is characterized in that described fluted disc (5) is that tangent to form joint oval for BC, the DA two pitch circle arcs of r by AB, CD two straight lines and radius, the distribution of tooth is corresponding also to be made up of AB, BC, CD, DA four parts, the CD part of AB part and symmetry, the distribution of tooth is identical with tooth bar, the DA part of BC part and symmetry, the distribution of tooth and Pitch radius are that the circular fluted disc of r is identical, A, B, C, D are the point of contact of pitch circle arc and straight line, and are the centers of teeth groove.The parameter of fluted disc (5) is:
Total tooth number Z of selected fluted disc (5)
1With Pitch radius be the tooth number Z of the circular fluted disc of r
2, Z
1, Z
2Be necessary for even number;
The pitch P of selected chain, then
r＝P/2sin(180°/Z
2)；
The number of teeth on straight line AB or the DC is:
Z
3＝(Z
1-Z
2)/2，
Then the center of fluted disc (5) and radius are the distance of the center of circle on major axis of the pitch circle arc of r
L＝P×Z
3。
4, sprocket transmission device according to claim 3 is characterized in that the total tooth number Z on the described fluted disc (5)
1Be 16～78.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02289589 CN2584945Y (en) | 2002-11-25 | 2002-11-25 | Chain wheel driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02289589 CN2584945Y (en) | 2002-11-25 | 2002-11-25 | Chain wheel driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2584945Y true CN2584945Y (en) | 2003-11-05 |
Family
ID=33749091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02289589 Expired - Fee Related CN2584945Y (en) | 2002-11-25 | 2002-11-25 | Chain wheel driving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2584945Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI712544B (en) * | 2018-11-15 | 2020-12-11 | 國立虎尾科技大學 | Composite sprocket and bicycle with composite sprocket |
-
2002
- 2002-11-25 CN CN 02289589 patent/CN2584945Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI712544B (en) * | 2018-11-15 | 2020-12-11 | 國立虎尾科技大學 | Composite sprocket and bicycle with composite sprocket |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |