CN1279640A - Cycle-crank - Google Patents
Cycle-crank Download PDFInfo
- Publication number
- CN1279640A CN1279640A CN98811328A CN98811328A CN1279640A CN 1279640 A CN1279640 A CN 1279640A CN 98811328 A CN98811328 A CN 98811328A CN 98811328 A CN98811328 A CN 98811328A CN 1279640 A CN1279640 A CN 1279640A
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- China
- Prior art keywords
- pedal
- connecting piece
- pedal arm
- central axis
- turning joint
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- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M3/00—Construction of cranks operated by hand or foot
- B62M3/02—Construction of cranks operated by hand or foot of adjustable length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M1/00—Rider propulsion of wheeled vehicles
- B62M1/36—Rider propulsion of wheeled vehicles with rotary cranks, e.g. with pedal cranks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M1/00—Rider propulsion of wheeled vehicles
- B62M1/10—Rider propulsion of wheeled vehicles involving devices which enable the mechanical storing and releasing of energy occasionally, e.g. arrangement of flywheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M3/00—Construction of cranks operated by hand or foot
- B62M3/02—Construction of cranks operated by hand or foot of adjustable length
- B62M3/04—Construction of cranks operated by hand or foot of adjustable length automatically adjusting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M3/00—Construction of cranks operated by hand or foot
- B62M2003/006—Crank arrangements to overcome dead points
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Devices For Bicycles And Motorcycles (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Arrangement And Mounting Of Devices That Control Transmission Of Motive Force (AREA)
Abstract
A cycle crank comprises at least one chain wheel (1) which is rotatably mounted about a centre axis (2) and two pedal arms (3, 3') each of which is restrictedly rotatably mounted in the chain wheel in its eccentric rotating joint (6, 6'). Two spring devices (8, 8') are each attached in the chain wheel in its eccentric first spring attachment (11, 11'), and pulls the pedal arms towards the centre axis (2). The pedal arms (3, 3') can rotate between an inner position in which they are turned towards the centre axis (2) and an outer position in which they point substantially radially out from the centre axis. An angle (v2) which is formed by a line between the first spring attachment (11, 11') and the centre axis (2) and a line between the centre axis and the rotating joint (6, 6') is between 30 DEG C and 150 DEG C.
Description
The present invention relates to bicycle crank, comprise
At least one sprocket wheel, it is rotatably mounted around a center shaft,
Two pedal arms, each pedal arm is installed in its turning joint place at first end to limit rotating mode, and each side of sprocket wheel is fixed and be arranged on prejudicially to this turning joint with respect to sprocket wheel, and be pivotally connected to respectively on its pedal at second end, so that the cyclist use power and
Two spring installations, each spring installation is attached on its first spring connecting piece at first end, each side of sprocket wheel is fixed and be arranged on prejudicially to the first spring connecting piece with respect to sprocket wheel, and be attached at second end on each pedal arm of the second spring connecting piece, the second spring connecting piece is with a certain distance from first end of pedal arm, to have second end of the pedal arm of pedal to the central axis traction, and when the power used on pedal increased, second end that allows to have the pedal arm of pedal left central axis.
Bicycle crank from bicycle pedal to one or more accentric sprocket wheel transmitting movements and power, with through a chain to further transmitting movement of trailing wheel and power.
In cyclist's pedalling action process, the power maximum in moving downward part, then very slight or no longer existence in remaining motion parts.In order to increase the energy that passes to bicycle from the cyclist, several devices have been proposed, these devices can extend the distance from the pedal to the crank center in downward pedalling action process, thereby to the longer torque arm of the power on the pedal one.
FR2062858 has described a kind of bicycle crank, and wherein an inner step arm and an outside pedal arm are connected a spring-loaded hinge place.Make this hinge be pressed into such position by a slice spring, wherein two pedal arms form about 90 ° angle.When masterpiece was used on the pedal, hinge was straightend in downward pedalling action process, and the power on pedal arm elongation as a result and the pedal just obtains a longer arm of force.
DE858648 has described a kind of bicycle crank that has a similar pedal arm, is to adopt coil spring to replace laminated spring but do not exist together.
NO80229 has described a kind of bicycle crank, it has the crooked pedal arm of an elasticity (sprung), when masterpiece was used on this pedal arm in downward pedalling action process, pedal arm was forced to be pulled out to roughly straight position, thereby increased the distance from pedal to the bicycle crank center.
US2316530 has described a kind of bicycle crank, and wherein pedal arm is attached on the sprocket wheel prejudicially rotationally, near the engagement radius of chain.Adopt eccentric connecting piece the connecting piece extension to pedal arm on of the spring installation of compression spring form from sprocket wheel, wherein spring installation has the pull bar that is entirely screw thread, and it impels compression spring to work as extension spring, thereby to sprocket wheel traction pedal arm.The eccentric rotary connecting piece of spring is positioned at the radially opposition side of the eccentric connecting piece of pedal arm, and the spring connecting piece in pedal arm compares with the rotation connecting piece of pedal arm, is positioned at the position of more close pedal.Setting nut on the pull bar provides the block of restraining spring motion, thereby pedal arm is moved between interior location and external position.
Other bicycle crank that has scalable or movable pedal is described in DE2509021, DE3813953, and FR2388713, SE419960 is among SE446846 and the DK162083.
Above-mentioned bicycle crank does not all have to drop in the use widely.Guessing this mainly is the fact of surrendering too easily owing to pedal, and the result makes the cyclist lose the sensation of control bicycle.Another reason may be the elongation that does not but occur pedal arm at the desirable pedalling action point of cyclist place.
The purpose of this invention is to provide a bicycle crank, stored energy partly when wherein the power on the pedal is maximum in the pedalling action process, and it is released as a propulsive effort in ensuing pedalling action process.To be the cyclist in the storage of energy and dispose procedure can be with the motion of foot and the masterpiece on the foot stable motion of another purpose or power and experienced.A purpose is in the process of the bottom of pedalling action again, compares with the situation of the known bicycle crank of stored energy not, and pedal can not move to and more be close to ground, to avoid the ground of scratching.Also having a purpose is will provide bicycle to cyclist's vibration and the buffering of jolting according to bicycle crank of the present invention.Another purpose is that the arm of force of treadle effort will extend in the pedalling action process downwards.Further purpose is that the present invention can realize by exchange in the bicycle crank of the pedal known type fixing with respect to sprocket wheel or increase element again.
According to the present invention, the bicycle crank that is used in the described type of preface part adds the feature described in claims, can reach above-mentioned these purposes.
Below in conjunction with description to specific embodiment, compare with the known bicycle crank of type described in the US2316530, and, narrate the present invention in more detail with reference to accompanying drawing, among the figure:
Fig. 1 is the front elevation that bicycle crank according to the present invention is watched from the sprocket wheel side of bicycle,
Fig. 2 is the front elevation of bicycle crank when opposition side is watched of Fig. 1,
Fig. 3 is the decomposition diagram that is used for the present invention's a turning joint,
Fig. 4 is the schematic diagram of the bicycle according to the present invention,
Fig. 5 a-e is illustrated in the downward pedalling action process according to bicycle crank of the present invention,
Fig. 6 a-e is illustrated in the downward pedalling action process bicycle crank in type described in the US2316530.
In institute's drawings attached, same reference marker is used for corresponding parts.
Fig. 1 and 2 represents respectively when the sprocket wheel side of bicycle and opposition side are watched according to bicycle crank of the present invention.Do not have the reference marker of mark to represent front pedal arm and corresponding element and part, wherein front pedal arm promptly is arranged in the pedal arm of downward pedalling action.The reference marker that has mark represents to be arranged in the upwards pedal arm of return movement.
In known way, bicycle crank comprises at least one sprocket wheel 1, and it is rotatably mounted around a central axis 2, is that the outer tooth ring of R1 is operated a chain by radius.In addition, two pedal arms 3,3 ' are installed in its turning joint 6,6 ' respectively and locate to limit rotating mode at first end 4,4 ', and wherein turning joint is arranged on each side of sprocket wheel 1 prejudicially and relatively is fixed thereon.Obtain captive joint between the rotating hinge chain and sprocket by arranging turning joint 6 at an end of carriage 17 in the sprocket wheel side, wherein carriage 17 is firmly connected on the sprocket wheel 1 and constitutes a reinforcement of sprocket wheel on function.At opposition side, turning joint 6 ' is arranged on the carriage 17 ', and this carriage 17 ' is firmly connected on the sprocket wheel through a rotating propeller boss 16.Rotating propeller boss 16 is and the same type of known bicycle crank of stored energy not therefore to be not described further.
Each pedal arm is pivotally connected to rotatable connecting piece 15,15 ' on its pedal 7,7 ', so that the cyclist firmly at second end 5,5 '.Two spring installations that adopt extension spring 8,8 ' form are attached to respectively on its first spring connecting piece 11,11 ' at first end 9,9 ', and each side of sprocket wheel is fixed and be arranged in prejudicially to described connecting piece with respect to sprocket wheel.Should fixing binding be to obtain by the spring connecting piece 11 that becomes a sprocket wheel part on the sprocket wheel side, the spring connecting piece 11 ' on the sprocket wheel opposition side then becomes the part of carriage 17 '.
When the downward force that increases acted on the pedal, extension spring 8,8 ' had pedal 7,7 to central axis 2 tractions ' second end 5,5 ' of pedal arm, make pedal arm second end that has pedal leave central axis along direction shown in the arrow P 2.
Fig. 3 is turning joint 6, a decomposition diagram of 6 '.Be firmly connected to a block 13 on the carriage 17,17 ', 13 ' with match at pedal arm 3,3 ' first end 4, a block 14,14 ' of 4 '.These two groups of blocks cause restricted rotation together in turning joint 6,6 '.
According to the present invention, block 13,14,13 ', 14 ' is suitable for allowing pedal arm 3,3 ' to rotate between an interior location and an external position, wherein form an obtuse angle V1, and externally position pedal arm 3,3 ' outwards roughly extends radially out (sensing) from central axis 2 at interior location pedal arm and the line between central axis 2 and turning joint 6,6 '.This most clearly is shown among Fig. 4, and this figure is the schematic diagram according to bicycle crank of the present invention, and it is illustrated in the pedal arm of interior location.External position is shown among Fig. 1, and wherein front pedal arm 5 is positioned at external position.
In addition, according to the present invention, when pedal arm was positioned at its interior location, first spring 11,11 ' should be positioned at second end 5 of line between central axis 2 and the turning joint 6,6 ' and pedal arm, the same side of 5 '.With reference to Fig. 4, this means that the first spring connecting piece 11 should be positioned on the line between central axis 2 and the turning joint 6,6 '.And, the position of the first spring connecting piece will be determined by an angle V2, this angle by the first spring connecting piece 11,11 ' and central axis 2 between line and the line between central axis 2 and turning joint 6,6 ' form, they should be between 30 °～150 °.
Fig. 5 a-e represents the situation of bicycle crank according to the present invention in downward pedalling action process, and wherein pedal is moved by the direction shown in the arrow P 1 by power F effect and sprocket wheel edge.This can find out when pedal arm internally position (referring to Fig. 5 b) when external position (referring to Fig. 5 c) was moved, how spring stretched, thereby stored energy.When pedal arm further moves down, during near the bottom of pedalling action, spring just shrinks (referring to Fig. 5 d), discharges the stored energy as propulsive effort, this drive force sprocket wheel, and pedal arm motion meanwhile turns back to interior location.
Test shows to external position with turn back in the motion process of pedal arm of interior location, is standing to act on the motion and the counter pressure of the pedal of cyclist's foot, as stable motion or power in position internally.
Test also shows, in the process of the bottom of pedal effect, compares with the known bicycle crank of stored energy not, and pedal can not move to such an extent that roughly more be close to ground.
According to bicycle crank of the present invention also provide to from bicycle to cyclist's vibration and the buffering of jolting.When the cyclist stand on the vehicle frame simultaneously a mountain bike when ride in coarse slope downwards, the sort buffer effect is particularly evident, and wherein the road surface may comprise for example tree root or stone, and it produces violent vibration and jolts in bicycle.In this case, the speed of bicycle is kept by gravity, and the cyclist almost stands on the pedal, and pedal stretches out forward and backward, shown in Fig. 5 c.Because on two pedals, and the tension force of supposition various sizes of bicycle crank and spring is suitable for cyclist's weight to the cyclist with its distribution of weight, then front running board will be presented on the elastomeric midway location between interior location and the external position.Because the rotation of trailing wheel and the free gear connecting piece between sprocket wheel and trailing wheel, the elastic movement of front running board will pass to back step and can not pass to trailing wheel.The spring buffer effect of two pedals is provided thus.
Employing can reach its further purpose according to bicycle crank of the present invention, and promptly the torque arm of treadle effort (arm of force), the torque arm that just acts on the power on the pedal by the cyclist are being extended in the pedalling action process downwards.Being extended with of the torque arm of treadle effort helps increase the energy that passes to sprocket wheel from the cyclist, but owing to also can finish this effect in the mentioned several known bicycle crank of beginning, so this feature itself can not be said so and constituted core of the present invention.
Realize that wherein in the propeller boss of type, pedal is fixed with respect to sprocket wheel on the corresponding propeller boss of known type that the present invention can be by being installed in carriage 17 sprocket wheel and standard.Similarly, carriage 17 ' can be installed on the propeller boss opposition side with respect to sprocket wheel.The first spring connecting piece 11 can be realized by the existing or new hole in the sprocket wheel.Therefore can realize the present invention with respect to the element in the bicycle crank of sprocket wheel fixed type by improving (retro-fitting) pedal.
Accurate relation between how experiencing according to the design of bicycle crank of the present invention and user is very complicated, and this depends on user's weight, mode that bicycle uses and cyclist's personal preference.Therefore, can not indicate relevant spring installation and bicycle crank different distance one accurately, the general-duty optimum dimension.
Yet, test shows turning joint 6,6 ' and pedal arm first end 4,4 ' in block 13,14,13 ', 14 ' should be designed so that angle V1 is between 110 ° and 160 °, be more preferably between 130 ° and 150 °, and preferably be approximately 145 ° as shown in Figure 4.
Proved that also the first spring connecting piece 11,11 ' should be arranged in such a way, promptly angle V2 is more preferably between 75 ° and 105 °, and preferably is approximately 90 ° as shown in Figure 4 between 60 ° and 120 °.
In addition, the distance between central axis 2 and the turning joint 6,6 ' should be 0.6～1.4 times of engagement radius R 1 of chain, is more preferably 0.8～1.2 times, and preferably is approximately 1.0 times, as shown in Figure 4.
The first spring connecting piece 11,11 ' and central axis 2 between distance should be 0.3～1.0 times of distance between central axis 2 and turning joint 6,6 ', be more preferably 0.5～0.8 times, and preferably be approximately 0.65 times.
Also confirmed turning joint 6,6 ' and the connecting piece 15,15 ' of pedal between distance should be 0.5～1.2 times of distance between central axis 2 and the turning joint 6,6 ', be more preferably 0.7～1.0 times, and preferably about 0.8 times.
In a preferred embodiment, as illustrated in fig. 1 and 2, the external diameter of sprocket wheel is 220mm, angle V1 is 145 °, angle V2 is 90 °, and the distance between central axis 2 and the turning joint 6,6 ' is 100mm, the first spring connecting piece 11,11 ' and central axis 2 between distance be 65mm, turning joint 6,6 ' and pedal connecting piece 15,15 ' between distance be 80mm, and the distance between the turning joint 6,6 ' and the second spring connecting piece 12,12 ' is 97mm.Spring installation comprises that the tension force with 1.3kN is tensioned to the linear stretch spring of incipient extension amount in advance.
In order further to illustrate the difference of the present invention and known bicycle crank, below by with relatively explain the present invention at the bicycle crank of type described in the US2316530 shown in Fig. 6 a.
Bicycle crank shown in Fig. 6 a comprises a sprocket wheel 101, one pedal arm 104 and a spring installation 108, wherein pedal arm at one end is attached on the sprocket wheel 101 with accentric turning joint 106, and be provided with a pedal 107 at the other end, spring installation 108 at one end is attached on the sprocket wheel 101 of the first spring connecting piece 111, then be attached on the pedal arm 104 at the other end, than the position of turning joint 106 more close pedals 107.In spring installation 108, adopt the stop assembly of nut form, guarantee that pedal arm 104 can move at the interior location shown in Fig. 6 a and between the external position shown in Fig. 6 c.Stop assembly is returned spring installation 108 pre-tensioning is provided.Spring connecting piece 111 is positioned at the position radially opposite with turning joint 106, and this is a basic difference with respect to bicycle crank according to the present invention.In addition, compare with the pedal arm in the bicycle crank according to the present invention, pedal arm 104 moves on the zone that more is close to crank center.
Fig. 5 a-e is illustrated in the downward pedalling action process according to bicycle crank of the present invention, and Fig. 6 a-e is illustrated in the corresponding pedalling action process downwards the bicycle crank in type described in the US2316530, Fig. 5 a is corresponding to Fig. 6 a, and Fig. 5 b is corresponding to Fig. 6 b, and the rest may be inferred.
Explain the difference between these two kinds of bicycle cranks below by considering theoretical mechanics.The kinetics relation relevant with the quality of bicycle crank element is unimportant for the operation mode of bicycle crank, thereby can ignore.
According to mechanics principle, when an object is subjected to a moment loading, it will begin to rotate, and wherein moment is defined by the product of a power and its arm of force.In the situation of two kinds of bicycle cranks, when the moment of treadle effort surpasses when coming from the moment of spring tension (calling spring force in the following text), pedal arm 4,104 will begin to rotate and internally the position move to external position, wherein moment is calculated around rotating hinge 6,106.Represent that with mathematical term the initial rotation according to the pedal arm of bicycle crank of the present invention is following moment equation:
F
p *a
p=F
s *a
s，
F wherein
pBe treadle effort, a
pBe the arm of force of treadle effort, F
sBe spring force and a
sThe arm of force for spring force.
Similarly, the moment equation below the initial rotation of the pedal arm of the bicycle crank of type described in the US2316530 is:
F’
p *a’
p=F’
s *a’
s，
Wherein adopt corresponding label symbol.
As long as turning joint 6,106 do not bear any moment, promptly at pedal arm in the whole motion process of external position, all can keep this moment equation.Therefore, the position of pedal arm determines that by treadle effort, its arm of force and spring force and its arm of force wherein these parameters all are variablees.Therefore, for two kinds of bicycle cranks, can understand a complete comparison of in pedalling action process pedal arm position very thoroughly.
In order to simplify description and comparison, suppose that in the process of downward pedalling action treadle effort vertically points to and has constant size, i.e. a F downwards to the bicycle crank operation mode
p=F '
p=F.
Fig. 5 a, 6a are illustrated near the pedal the top, and wherein treadle effort points to turning joint.So arm of force a of treadle effort
p, a '
pBe 0, and treadle effort does not produce moment.Spring force has arm of force a
s, a '
sAnd produce the moment that pedal arm is remained on interior location.
The arm of force that Fig. 5 b, 6b are illustrated in treadle effort equates with the arm of force of spring force, i.e. a
p=a
sAnd a '
p=a '
sThe pedal of position.For ease of comparing, suppose that the spring in two kinds of bicycle cranks is of a size of such mode, be that the required tension force of spring incipient extension is identical with treadle effort, so Fig. 5 b, the 6b moment that is illustrated in treadle effort will surpass the moment of spring force and the pedal arm pedal when beginning to shift out interior location.
Fig. 5 c, 6c are illustrated in when the pedal of treadle effort during perpendicular to the position of the distance from the pedal to the turning joint.In this case, the arm of force a of treadle effort
p, a '
pEqual the distance from the pedal to the turning joint, obtain its maxim thus, this means that the moment of treadle effort also obtains its maxim.For two kinds of bicycle cranks, the arm of force a of treadle effort as can be seen
p, a '
pArm of force a for spring force
s, a '
sAbout twice, suppose that spring is of a size of such mode in two kinds of bicycle cranks, promptly pedal arm is positioned at external position.
Fig. 5 d, 6d are illustrated in the arm of force a of treadle effort
p, a '
pArm of force a for spring force
s, a '
sAbout 1.33 times of positions the time pedal.Because pedal arm is positioned at external position and spring is stretched in this case, therefore spring force is than big when pedal arm is positioned at interior location, for ease of contrast, suppose in the size of two kinds of bicycle crank medi-springs and set by this way that promptly pedal arm begins to move to interior location at this.
Fig. 5 e, 6e represent pedal arm near the bottom, and treadle effort points to turning joint once more.The arm of force a of treadle effort
p, a '
pBe 0 once more, thereby treadle effort does not produce moment.The arm of force a of spring force
s, a '
sImpel spring force to produce a moment, this moment remains on interior location with pedal arm.
For each corresponding Fig. 5 a-e and 6a-e, the arm of force of treadle effort is identical with ratio between the arm of force of spring force.By comparing these figure, the pedal among Fig. 6 a-e gets farther than the pedal travel in corresponding Fig. 5 a-e in pedalling action as can be seen.When comparison diagram 5c and 6c and 5d and 6d, can especially clearly illustrate this point, be in the zone that the pedal arm setting in motion turns back to interior location this moment.Therefore, these charts are illustrated in according in the bicycle crank of the present invention, have obtained extension and contraction than more Zao pedal arm in the bicycle crank of type described in the US2316530.The extension and the contraction of exactly this pedal arm more early are of value to the cyclist.
By comparison diagram 5e and 6e, can further find out the zone that turns back to interior location in pedal arm motion, according to bicycle crank of the present invention can obtain to compare the bicycle crank of type described in the US2316530 round with thereby the pedal effect of more suitable cunning.
The moment of treadle effort depends on the turned position of crank, and as described in conjunction with Fig. 5 c, when treadle effort perpendicular to from the pedal to the turning joint apart from the time have its maxim.Wish to occur this maximum torque when pedal roughly is positioned on the height of central axis, therefore according to the present invention, when pedal arm was positioned at external position, it roughly stretched out radially outwardly from central axis.
But the arm of force of spring force does not but depend on the turned position of crank.As illustrated in Figures 5 and 6, the arm of force of spring force depends on the position of pedal arm and the position of the first spring connecting piece, and can find out for these two kinds of bicycle cranks, and the arm of force of spring force is along with pedal arm reduces to the external position motion position internally.
As can be seen from Figure 5, the first spring connecting piece can not be positioned at the radially opposition side of turning joint in bicycle crank according to the present invention, because when pedal arm when external position is moved, this will cause the arm of force trend 0 of spring force to change, wherein externally during the position pedal arm radially outward stretch out from central axis.This condition determines that by angle V2 wherein angle V2 is formed by line between the first spring connecting piece and the central axis and the line between central axis and the turning joint according to the present invention, and it is at least 30 °.The present invention is further limited by such fact, and promptly angle V2 should be 150 ° to the maximum, because bigger angle will produce the less extension of spring in the pedal arm motion process.Yet, should be understood that from above argumentation these restrictions are not strict for the actual design according to bicycle crank of the present invention.
Claims (10)
1. a bicycle crank comprises
At least one sprocket wheel (1), it is rotatably mounted around a central axis (2),
Two pedal arms (3,3 '), each pedal arm is pivotally mounted to its turning joint (6 at first end (4,4 '), 6 ') in, turning joint is fixing and be arranged on each side of sprocket wheel (1) prejudicially with respect to sprocket wheel (1), and connects (15 rotationally respectively at second end (5,5 '), 15 ') to its pedal (7,7 ') on, so that the cyclist uses power, turning joint (6,6 ') and first end (4 of pedal arm, 4 ') be provided with corresponding block (13,14,13 ', 14 '), these stop limits pedal arms (3,3 ') between two exterior points, rotate and
Two spring installations (8,8 '), each spring installation is at first end (9,9 ') be attached to its first spring connecting piece (11,11 ') on, the first spring connecting piece is fixing with respect to sprocket wheel (1), at second end (10,10 ') be attached to the second spring connecting piece (12,12 ') on each pedal arm (3,3 '), the second spring connecting piece is from first end (4 of pedal arm, 4 ') certain distance, to have second end (5,5 ') of the pedal arm of pedal (7,7 ') to central axis (2) traction, and second end that allows to have the pedal arm of pedal on pedal when the power used increases leaves (P2) central axis
It is characterized in that:
Block (13,14,13 ', 14 ') be suitable for allowing pedal arm between an interior location and an external position, to rotate, at interior location, line between pedal arm (3,3 ') and central axis (2) and the turning joint (6,6 ') forms an obtuse angle (V1), and position externally, pedal arm (3,3 ') from central axis (2) roughly radially outward stretch out and
When pedal arm is positioned at its interior location, the first spring connecting piece (11,11 ') be positioned at central axis (2) and turning joint (6,6 ') the same side of line between and pedal arm second end (5,5 ') is by the definite position of angle (V2), this angle is by the first spring connecting piece (11,11 ') and the line between the central axis (2) and formed by the line between central axis (2) and the turning joint (6,6 '), they are between 30 ° and 150 °.
2. bicycle crank as claimed in claim 1 is characterized in that: the second spring connecting piece (12,12 ') is positioned at second end (5,5 ') of pedal arm, and is consistent or contiguous with the connecting piece (15,15 ') of pedal.
3. bicycle crank as claimed in claim 1 or 2, it is characterized in that: at turning joint (6,6 ') and pedal arm first end (4,4 ') internal stop (13,14,13 ', 14 ') be suitable for when pedal arm is positioned at its interior location, at pedal arm (3,3 ') with central axis (2) and turning joint (6,6 ') angle between the line between (V1) is between 110 ° and 160 °, is more preferably between 130 ° and 150 °, and preferably about 145 °.
4. the described bicycle crank of one of claim as described above, it is characterized in that: the first spring connecting piece (11,11 ') position is determined by angle (V2), this angle is by the first spring connecting piece (11,11 ') and the line between the central axis (2) and central axis (2) form with line between the turning joint (6,6 '), they are between 60 ° and 120 °, be more preferably between 75 ° and 105 °, and preferably be approximately 90 °.
5. the described bicycle crank of one of claim as described above, it is characterized in that: central axis (2) and turning joint (6,6 ') distance between is 0.6～1.4 times of chain engages radius (R1), is more preferably 0.8～1.2 times, preferably about 1.0 times.
6. the described bicycle crank of one of claim as described above, it is characterized in that: the first spring connecting piece (11,11 ') and the distance between the central axis (2) be central axis (2) and turning joint (6,6 ') 0.3～1.0 times of the distance between, be more preferably 0.5～0.8 times, and preferably about 0.65 times.
7. the described bicycle crank of one of claim as described above, it is characterized in that: turning joint (6,6 ') with the connecting piece (15 of pedal, 15 ') distance between is central axis (2) and turning joint (6,6 ') between 0.5～1.2 of distance times, more preferably 0.7～1.0 times, and be preferably about 0.8 times.
8. the described bicycle crank of one of claim as described above, it is characterized in that: the second spring connecting piece (12,12 ') is positioned at from turning joint (6,6 ') than the farther position of connecting piece (15,15 ') from pedal.
9. the described bicycle crank of one of claim as described above, it is characterized in that: spring installation (8,8 ') is made up of pre-tensioned extension spring.
10. the described bicycle crank of one of claim as described above, it is characterized in that: sprocket wheel (1) is attached firmly on the rotating propeller boss (16), this propeller boss is attached firmly to carriage (17 in the both sides of sprocket wheel, 17 ') on, and carriage is attached firmly to turning joint (6,6 ') and on the first spring connecting piece (11,11 ').
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO975001 | 1997-10-30 | ||
| NO975001A NO975001A (en) | 1997-10-30 | 1997-10-30 | Bicycle sick |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1279640A true CN1279640A (en) | 2001-01-10 |
Family
ID=19901271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98811328A Pending CN1279640A (en) | 1997-10-30 | 1998-10-07 | Cycle-crank |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1024995A2 (en) |
| JP (1) | JP2001521859A (en) |
| KR (1) | KR20010024568A (en) |
| CN (1) | CN1279640A (en) |
| AU (1) | AU732911B2 (en) |
| CA (1) | CA2307608A1 (en) |
| NO (1) | NO975001A (en) |
| WO (1) | WO1999022981A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110329416A (en) * | 2019-08-20 | 2019-10-15 | 陈德强 | A kind of upward slope labour-saving bicycle pedal mechanism |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19927733A1 (en) * | 1999-06-17 | 2000-12-21 | Kageneck Karl Erbo Graf | Pedal drive for bicycles has pedal arms with two arm elements, with one element moved telescopically relative to second element against a spring, which stores mechanical energy |
| FR2807998B1 (en) * | 2000-04-25 | 2002-06-14 | Henri Peyre | PULSE BICYCLE PEDAL |
| WO2005087576A1 (en) * | 2004-03-09 | 2005-09-22 | Dabbaj Rad H | Drive mechanism and vehicle |
| WO2006045150A1 (en) * | 2004-10-26 | 2006-05-04 | Robert Masterton Smith | Improvements in drive mechanisms for human-powered machines |
| WO2006060874A1 (en) * | 2004-12-10 | 2006-06-15 | Univ Western Sydney | A drive assembly for a crank mechanism |
| CN104340321A (en) * | 2013-07-23 | 2015-02-11 | 赵广胜 | Reciprocating type double-energy-accumulation driving device and manufacturing method thereof |
| FR3023534A1 (en) * | 2014-07-10 | 2016-01-15 | Etienne Hammann | PEDALIER, IN PARTICULAR BICYCLE PEDAL. |
| JP2021508630A (en) * | 2017-11-02 | 2021-03-11 | リアクト アクティヴ バイク リミテッドＲｅａｃｔ Ａｃｔｉｖｅ Ｂｉｋｅ Ｌｔｄ． | Foot propulsion assembly |
| JP6660642B1 (en) * | 2018-10-01 | 2020-03-11 | 籠田 憲雄 | Power transmission device for bicycle |
| US11584474B1 (en) * | 2019-09-21 | 2023-02-21 | Jorge Valdez | Bicycle propulsion system |
| US11814134B2 (en) * | 2021-12-16 | 2023-11-14 | John Daniel Corder | Pivoting crank arm for increased torque |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR542368A (en) * | 1921-10-15 | 1922-08-10 | Bicycle crankset with toothed wheel and compensating springs | |
| US2316530A (en) * | 1941-05-03 | 1943-04-13 | Torval W Nilsen | Crank unit |
| FR2409183A1 (en) * | 1977-11-22 | 1979-06-15 | Chepelow Vsevolod | Bicycle drive with spring assist - has springs acting on crank and extension, with force adjusted by screws |
| DE3425342A1 (en) * | 1984-03-24 | 1986-01-16 | Günther 7505 Ettlingen Zschernitz | Articulated tread crank for bicycle |
| US5157988A (en) * | 1991-06-11 | 1992-10-27 | Pinkstock Donald H | Elastic crank for bicycles |
-
1997
- 1997-10-30 NO NO975001A patent/NO975001A/en unknown
-
1998
- 1998-10-07 CN CN98811328A patent/CN1279640A/en active Pending
- 1998-10-07 JP JP2000518875A patent/JP2001521859A/en not_active Withdrawn
- 1998-10-07 KR KR1020007004484A patent/KR20010024568A/en not_active Application Discontinuation
- 1998-10-07 EP EP98951824A patent/EP1024995A2/en not_active Withdrawn
- 1998-10-07 CA CA002307608A patent/CA2307608A1/en not_active Abandoned
- 1998-10-07 AU AU97667/98A patent/AU732911B2/en not_active Ceased
- 1998-10-07 WO PCT/NO1998/000302 patent/WO1999022981A1/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110329416A (en) * | 2019-08-20 | 2019-10-15 | 陈德强 | A kind of upward slope labour-saving bicycle pedal mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2307608A1 (en) | 1999-05-14 |
| JP2001521859A (en) | 2001-11-13 |
| EP1024995A2 (en) | 2000-08-09 |
| WO1999022981A1 (en) | 1999-05-14 |
| NO304734B1 (en) | 1999-02-08 |
| NO975001D0 (en) | 1997-10-30 |
| AU9766798A (en) | 1999-05-24 |
| AU732911B2 (en) | 2001-05-03 |
| NO975001A (en) | 1999-02-08 |
| KR20010024568A (en) | 2001-03-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |