JPH0550975A - Crank mechanism of lengthened crank for bicycle - Google Patents

Abstract

PURPOSE:To increase the speed of a bicycle and to reduce the power nearly half, by transmitting a rotation torque amplified with a crank lever of lengthened crank to a chain ring through a primary link, a mediate link and a secondary link. CONSTITUTION:On one end portion of a hangershaft A fixed to a large diameter chain ring 7, one end of a fulcrum shaft holding arm 1 and a secondary link 2 are fixed, and a primary link 5 is fixed onto one end of a crank lever 4 fixed with a pedal shaft B on the other end, and a fulcrum shaft 3 fixed to the other end of the fulcrum holding arm 1 is axially fixed to the primary link 5. Where, respective central axial lines of the fulcrum shaft 3, the hangershaft A and the pedal shaft B are made to be on a same plane, and adjusted so as that the hangershaft A lies between the fulcrum shaft 3 and the pedal shaft B, and mediate links 6 are provided on the primary link 5 and the secondary link 2. And at least one portion of the fulcrum shaft holding arm 1 is made with fixed springs or elastic rubber so as to have a specified elastic force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crank lever having a doubled crank length, which doubles the rotational torque amplified to a hanger shaft.
It relates to a bicycle crank mechanism that is transmitted to the chain ring.

[0002]

2. Description of the Related Art Generally, as a prior art, in a bicycle driving force generator, an input from a petal by human power is transmitted to a crank, and is transmitted as a rotational torque to a hanger shaft fixed to the other end of the crank. It is transmitted from the chain ring that is firmly connected to the rear gear through the chain, giving the rear wheel a driving force. The magnitude of the rotation torque is determined in proportion to the magnitude of the input by human power and the crank length. Therefore, the longer the crank length, the greater the rotational torque obtained,
Since the width of rotation of the foot of the human body and the height of the hanger above the ground from the center axis of the hanger shaft to the ground are naturally limited, the conventional method of fixing one end of the crank directly to the hanger shaft dramatically increases the crank length. It was not possible to increase the maximum crank length, and about 16 cm was the general crank length. Therefore, the conventional technology has not been able to achieve a dramatic speedup or labor saving.

[0003]

DISCLOSURE OF THE INVENTION In the prior art,
The crank length cannot be dramatically increased from the current state. Therefore, it is difficult for the conventional bicycle having the crank mechanism to achieve a drastic speedup and labor saving over the current state. The present invention aims to eliminate the above-mentioned drawbacks. That is, while the turning radius of the crank is kept the same as that of the conventional one, the magnitude of the turning torque is increased by 2 by increasing the length of the crank, which is a factor of generation of the turning torque, twice.
This is to double the speed, speed up nearly twice that of conventional bicycles, and reduce labor by almost half.

[0004]

The structure of the present invention will be described. [A] One end of the fulcrum shaft holding arm (1) and the follower (2) are connected to the end of the hanger shaft (A). It sticks. [B] The fulcrum shaft (3) fixed to the other end of the fulcrum shaft holding arm (1) by fixing the original node (5) to the other end of the crank lever (4) fixed to the petal shaft (B) at one end It is attached as a pivotable pin joint. [C] The fulcrum shaft (3) and the central axis of each of the hanger shaft (A) and the petal shaft (B) are on the same plane or close to the same plane, and the fulcrum shaft (3) and the petal shaft (B) ) Adjust the hanger shaft (A) so that it comes between them, and connect the intermediate node (6) to the original node (5) and the follower node (2).
Through. [D] The central portion of the fulcrum shaft holding arm (1) is formed by fixing and mounting various springs such as leaf springs and coil springs, elastic rubber and synthetic resin having elasticity so as to have a required elasticity. To do. [E] If the above is the left crank mechanism of the bicycle of the present invention, the right crank mechanism of the bicycle has the above [A] to [D].
In addition, the chain ring (7) is fixedly connected to the hanger shaft (A). The bicycle crank mechanism configured as described above.
To add a little explanation of the concept of the element, when the fulcrum shaft holding arm, the fulcrum shaft, and the follower, and the crank lever and the original joint are integrally formed by casting or welding, etc. Since it is a component of, it is originally one element, so it is generally called with one name, but for the explanation of the function of the mechanism,
The names are divided into the above names. However, the hexagon socket head cap screw or the claw head cap screw having a circular edge forming the tip edge of each shaft shall be treated as a part of the shaft to which they are screwed, and are therefore denoted by the same reference numerals. Further, the axis that plays a role of pin joint between the original node (5) or the follower node (2) and the intermediate node (6) is included in the element on the side where the axis is fixed, and the included element. They are designated by the same code and name as part of the prime. The two types of shafts are not fixed to any of the engaging elements and all function as pin joints, but in that case, they are treated as a part of engaging followers.

[0005]

The operation will be described based on the structure of the present invention. The link between the original node (5), the intermediate node (6), the follower node (2), and the fulcrum shaft holding arm (1) includes three pin contacts and one elastic body. Therefore, although it is not a perfect link mechanism, it does not mean that it is a rigid body and the swing of the link is locked. By installing the elastic body of the fulcrum shaft holding arm (1) with necessary and sufficient elasticity, the above four elements can smoothly perform the following functions.
Now, the force input from the petal shaft (B) by human power is due to the crank lever (4) having a length that is twice as long as the conventional crank length.
Double rotation torque is generated. The torque is a medium node (6)
Is converted into a linear force via and transmitted to the follower (2). The linear force is converted into a rotational torque again by the follower and acts on the hanger shaft (A) fixedly connected. Since the fulcrum shaft (3) and the crank lever (4) are pin-jointed, the force of the crank lever generated around the fulcrum shaft is only a moment, and the tangential linear force on the rotation circumference is generated. do not do. Therefore, during this period, there is no principle where the force is attenuated, and accordingly, the rotating torque twice as large as the conventional torque is transmitted to the hanger shaft (A). Further, since the original joint (5) is installed symmetrically with respect to the crank lever (4), no mechanical stress is generated on the fulcrum shaft (3),
Therefore, no stress is transmitted from the fulcrum shaft to the fulcrum shaft holding arm (1). {However, when the intermediate node is a gear as in "Fig. 9", the force is transmitted as it is as a rotational force without changing to a linear force. In this case, a stress that is parallel to the input tangential direction and opposite in direction is generated on the shaft that supports the gear as the intermediate node (6) and is transmitted to the fulcrum shaft holding arm (1), but is opposite to the fulcrum shaft (3). Since the stresses having the same force are generated in the same direction, they are canceled by each other, and as a result, the mechanical stress of the fulcrum shaft holding arm (1) becomes zero. } Since the crank lever (4) and the fulcrum shaft holding arm (1) are pin-joined to each other via the pivotal shaft attachment of the fulcrum shaft (3), the moment of force is not transmitted. Therefore, the rotation torque is not reduced at all. Since the hanger shaft (A) is fixed to the fulcrum shaft holding arm (1) and the follower (2), they make the same periodic motion. Further, since the crank lever (4) and the knuckle (5) are fixed, they make the same periodic motion. Then, the medial node (6) for immediately transmitting the motion is applied to the original node (5) and the follower node (2). Therefore, the movement of the crank lever (4) immediately causes the other required elements of the mechanism to perform a simultaneous and irreversible chasing movement. In addition, the same periodic motion in the above means a rotary motion having the same rotational angular velocity with the axis of the hanger shaft (A) as the center of rotation. The fulcrum shaft (3) secures one end of the crank lever (4) by the fulcrum shaft holding arm (1) in a positional relationship in which the fulcrum shaft holding arm (1) is always kept at a constant distance from the axis of the hanger shaft (A). ..
On the other hand, the center point of the rotational movement of the crank lever (4) coincides with the axial center position of the hanger shaft (A) in cooperation with the intermediate joint (6) interposed by the required adjustment.
And, it is the fulcrum shaft (3) that directly induces the rotational movement, but the change of the position is caused by the crank lever (4). Here, the main body of the rotational movement and the object are simultaneously generated, and are irreversibly separated. Therefore, the pin joint of the fulcrum shaft (3) does not cause adhesion due to the strain due to the displacement of the movement, and functions as the original pin contact,
In principle, there is nothing to transmit the moment of force. Also, the rotation stroke of the crank lever (4) is the same as the rotation stroke of the crank of the prior art, regardless of the amplification of the length of the crank lever. That is, the radius of rotation is the distance from the petal shaft to the hanger shaft. According to the above, the crank mechanism of the present invention has the same rotation stroke as the crank of the prior art,
The rotating torque can be amplified up to 2 times. That is, assuming that the conventional crank length is L, the length of the crank lever is twice that of 2L, and the input from the petal shaft is R, the torque generated on the hanger shaft is LR in the prior art, In the crank mechanism of the present invention, a torque of 2LR is generated in the original node at the position of the fulcrum shaft, and the intermediate node
The follower is transmitted and the torque of 2LR is generated on the hanger shaft as it is. It should be noted that the method of joining the fulcrum shaft (3) and the required element is that one-side fixation and the other-side attachment are appropriate, but the point is that the bending stress of the torque is not transmitted between the required elements. Therefore, it is not always necessary to pivotally mount the shaft, and it is sufficient to use a pin joint having a play that does not transmit the bending stress. Now,
The length of the crank lever is set according to the following relational expression. 2 x crank length of prior art ≥ length of the crank lever> crank length of prior art + α α is a dead space such as a medial node. {However, in the case of application to a human-powered airplane, it is not necessary to consider the ground height of the crank, so the length of the crank rehaggy can be doubled or more. } Regardless of the length of the crank lever, the rotation stroke is the same as the crank of the prior art. Therefore, the most efficient crank lever length is to double the crank length of the prior art. Next, the number of gear teeth of the chain ring (7) will be described. Generally, the number of teeth of the front outer gear of the prior art is 50th and the top gear of the rear freewheel is 14th. Gear ratio between front and rear is 6
Should be: Therefore, the chain ring (7)
The appropriate number of teeth is 70 to 80. Further, as a matter of course, since the crank lever can be rotated in the reverse direction so as to idle, just like the conventional bicycle, the driving method is the same as that of the conventional bicycle, and there is no inconvenience.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. First, an embodiment of the fulcrum shaft holding arm (1) will be described. In Fig. 1, the leaf springs are installed in the link mechanism so as to exert the required elastic effect. Therefore, if necessary, the leaf springs are not limited to linear ones, but may be bent to some extent. The leaf spring is installed in the center of the fulcrum shaft holding arm (1), and both ends are fastened with bolts and fixed. In FIG. 11, a coil spring is used as an elastic body, and both ends thereof are fixed by welding to be integrated with the fulcrum shaft holding arm (1). In FIG. 12, elastic rubber is used as the elastic body,
The both ends of the fulcrum shaft holding arm (1) are fixed to each other by pasting. In addition, various known elastic bodies can be used as the elastic body. Next, an example of the crank mechanism will be described. [A] A petal shaft (B) is fixedly screwed to one end of the crank lever (4), and a bearing hole (9) is provided at the other end in parallel with the petal shaft (B). An arm serving as a boss (5) is projectingly fixed to the outer peripheral portion of the bearing hole so as to form a right angle with the longitudinal direction of the crank lever and the axial direction of the bearing hole. [B] The fulcrum shaft (3) is attached to one end of the fulcrum shaft holding arm (1).
Is projected and fixed in parallel with the hanger shaft, and a mounting hole (10) for the hanger shaft (A) is provided at the other end,
An arm as a follower (2) is protrudingly fixed to the outer peripheral portion of the mounting hole so as to form a right angle with the longitudinal direction of the fulcrum shaft holding arm and the axial direction of the mounting hole. The mounting hole is inserted into the tip of the hanger shaft and fixed with a fixing bolt (11). {The tip of the hanger shaft (A), which is the joint of the mounting hole (10), has a length about twice that of the conventional one. } [C] The bearing hole (9) of the crank lever (4) is inserted into the fulcrum shaft (3), and a hexagon socket head cap screw having a circular edge forming an edge at the end of the shaft is mounted and shaft mounted. Adjust the fulcrum shaft holding arm (1) and the crank lever (4) so that they overlap with each other when the fulcrum shaft (3) is a turning point, and the arms of the original node (5) and the follower node (2) are adjusted. At the end is a rigid bar as a medial joint (6). [D] Both the original node (5) and the follower node (2) are symmetrically projected and fixed to the crank lever (4), and the bar as the intermediate node (6) is connected to the original node. When the original side and the follower side are pin-jointed together when engaged through the follower, the bar becomes an intermediate node as shown in FIG. 1, and the crank mechanism in the scope of claim 2 is formed. become. “E” When the original node (5) and the follower node (2) are engaged by direct abutting without using the mediating node (6) in the above, the result becomes as shown in FIG. This is the crank mechanism. [F] If the above-mentioned bar is transmitted to the original side and the follower side due to the abutting which is irreversibly butted so that only the pushing force is transmitted as a linear force, the link device as shown in FIG. And the crank mechanism in the scope of claim 2.
{The intermediate node of the link device is formed by pin-joining the connecting rod (12) engaged with the bar by pin-joining to the side surface of the fulcrum shaft holding arm (1). } [G] As another embodiment, the crank mechanism as shown in FIG. 8 in which sprockets are used for the source and the followers and a chain is used as the medium. Further, gears are used for the original node and the follower node, and an odd number of gears are axially mounted on the side surface of the fulcrum shaft holding arm (1) as the intermediate node [FIG. 9].
The crank mechanism like. Also, a wire rope can be used as an intermediary node as shown in FIG. "Figure 1
1 ”and“ FIG. 12 ”have the same meaning as“ FIG. 1 ”, but the elastic body portions of the fulcrum shaft holding arm (1) are mounted and formed by a coil spring and elastic rubber, respectively. [H] "FIG. 13" shows a rigid bar serving as a medium joint (6) provided only on the side on which compressive stress acts at the time of input as a driving force. At this time, the fulcrum shaft holding arm (1) is provided.
A tensile stress will be generated in the shaft, which will affect the transitional movement of the fulcrum shaft (3), but it belongs to the category of "claim 2."

[0007]

As described above, the crank mechanism of the present invention can generate twice the rotational torque as compared with the bicycle of the prior art, while having the same rotational stroke. Therefore, it means that the speed can be doubled and the labor can be reduced to half. The principle of the crank mechanism of the present invention is widely applied as a crank of an internal combustion engine, a turbine engine, and an output amplifier, and can be used in various fields of energy use, resulting in a great energy saving effect. Technology.

[Brief description of drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a plan view of the present invention.

FIG. 3 is a front view of a right crank mechanism / chaining chain of the present invention.

FIG. 4 is a sectional view of a portion I.

FIG. 5 is a sectional view of a portion II.

FIG. 6 is a perspective view of the present invention.

FIG. 7 is a perspective view of the present invention.

FIG. 8 is a perspective view of the present invention.

FIG. 9 is a perspective view of the present invention.

FIG. 10 is a perspective view of the present invention.

FIG. 11 is a perspective view of the present invention.

FIG. 12 is a perspective view of the present invention.

FIG. 13 is a perspective view of the present invention.

[Explanation of symbols]

A ・ Hanger shaft B ・ Petal shaft C ・ Chain 1 ・ Fulcrum shaft holding arm 2 ・ Following shaft 3 ・ Fulcrum shaft 4 ・ Crank lever 5 ・ Original shaft 6 ・ Intermediate shaft 7 ・ Chain ring 9 ・ Bearing hole 10 ・ Support shaft shaft holding Attachment hole for hanger shaft on arm 11 ・ Fixing bolt 12 ・ Connecting rod at intermediate node of link device

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[Procedure amendment]

[Submission date] December 2, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

The structure of the present invention will be described. [A] One end of the fulcrum shaft holding arm (1) and the follower (2) are connected to the end of the hanger shaft (A). It sticks. [B] The fulcrum shaft (3) fixed to the other end of the fulcrum shaft holding arm (1) by fixing the original node (5) to the other end of the crank lever (4) fixed to the petal shaft (B) at one end It is attached as a pivotable pin joint. [C] The fulcrum shaft (3) and the central axis of each of the hanger shaft (A) and the petal shaft (B) are on the same plane or close to the same plane, and the fulcrum shaft (3) and the petal shaft (B) ) Adjust the hanger shaft (A) so that it comes between them, and connect the intermediate node (6) to the original node (5) and the follower node (2).
Through. [D] The central portion of the fulcrum shaft holding arm (1) is formed by fixing and mounting various springs such as leaf springs and coil springs, elastic rubber and synthetic resin having elasticity so as to have a required elasticity. To do. [E] If the above is the left crank mechanism of the bicycle of the present invention, the right crank mechanism of the bicycle has the above [A] to [D].
In addition, the chain ring (7) is fixedly connected to the hanger shaft (A). The bicycle crank mechanism configured as described above.
To add a little explanation of the concept of the element, when the fulcrum shaft holding arm, the fulcrum shaft, and the follower, and the crank lever and the original joint are integrally formed by casting or welding, etc. Since it is a component of, it is originally one element, so it is generally called with one name, but for the explanation of the function of the mechanism,
The names are divided into the above names. However, the hexagon socket head cap screw or the round head cap screw having a circular edge forming the tip edge of each shaft shall be treated as a part of the shaft to be screwed, respectively.
Therefore, they are represented by the same reference numerals. Also, the original clause (5)
And shaft responsible for pin junction followers (2) mediated clause (6) is assumed that is part of the machine element of the shaft of the anchored side, the same as part of its Included machine element It shall be designated by a code and a name. The two kinds of shafts are not fixed to any of the engaging elements and all function as pin joints, but in that case, they are treated as a part of the intermediary node (6) to be engaged . ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 15, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title: Bicycle crank mechanism with increased crank length

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hanger shaft / chain ring which has a rotational torque amplified by 1.5 times by a crank lever in which the length of a crank is doubled, through a master, a mediator and a follower. The present invention relates to a crank mechanism for a bicycle or the like .

[0002]

2. Description of the Related Art Generally, as a prior art, in a bicycle driving force generator, an input from a petal by human power is transmitted to a crank, and is transmitted as a rotational torque to a hanger shaft fixed to the other end of the crank. It is transmitted from the chain ring that is firmly connected to the rear gear through the chain, giving the rear wheel a driving force. The magnitude of the rotation torque is determined in proportion to the magnitude of the input by human power and the crank length. Therefore, the longer the crank length, the greater the rotational torque obtained,
Since the width of rotation of the foot of the human body and the height of the hanger above the ground from the center axis of the hanger shaft to the ground are naturally limited, the conventional method of fixing one end of the crank directly to the hanger shaft dramatically increases the crank length. It was not possible to increase the maximum crank length, and about 16 cm was the general crank length. Therefore, the conventional technology has not been able to achieve a dramatic speedup or labor saving.

[0003]

[Problems to be Solved by the Invention] In the prior art,
The crank length cannot be dramatically increased from the current state. Therefore, it is difficult for the conventional bicycle having the crank mechanism to achieve a drastic speedup and labor saving over the current state. The present invention aims to eliminate the above-mentioned drawbacks. In other words, while keeping the turning radius of the crank the same as that of the conventional one, by increasing the length of the crank, which is a factor of generating the turning torque, by two times, the magnitude of the turning torque is increased.
This is to increase the speed by 1.5 times, which is about 1.5 times faster than conventional bicycles and enables labor savings.

[0004]

To explain the structure of the present invention, [a] one end of a fulcrum shaft holding arm (1) and a follower (2) are fixed to the end of the hanger shaft (A). [B] The fulcrum shaft (3) fixed to the other end of the fulcrum shaft holding arm (1) by fixing the original node (5) to the other end of the crank lever (4) fixed to the petal shaft (B) at one end Pivot on. [C] The fulcrum shaft (3) and the central axis of each of the hanger shaft (A) and the petal shaft (B) are on the same plane or close to the same plane, and the fulcrum shaft (3) and the petal shaft (B) ) Adjust the hanger shaft (A) so that it comes between them, and connect the intermediate node (6) to the original node (5) and the follower node (2).
Through. [D] At least a part of the fulcrum shaft holding arm (1) is
Various springs such as leaf springs and coil springs, elastic rubber, synthetic resin having elasticity, etc. are fixedly mounted to have a required elasticity. [E] If the above is the left crank mechanism of the bicycle or the like of the present invention, in addition to [A] to [D] above, the right crank mechanism fixes the chain ring (7) to the hanger shaft (A). It is formed by connecting them. A crank mechanism such as a bicycle made by constructed as above. In addition, adding a little explanation about the concept of the element,
Since the fulcrum shaft holding arm and fulcrum shaft and follower, and the crank lever and original joint are integrally formed by casting, welding, etc., they become a single component, so it is essentially a single element, and therefore a single name. In general, the above names are used to describe the function of the mechanism. However, the hexagon socket head cap screw or the claw head cap screw having a circular edge forming the tip edge of each shaft shall be treated as a part of the shaft to which they are screwed, and are therefore denoted by the same reference numerals. Further, the axis that plays the role of pin joint between the original node (5) or the follower node (2) and the medial node (6) is included in the element on the side where the axis is fixed, and the element included. Shall be designated by the same reference numeral and name. The two kinds of shafts are not fixed to any of the engaging elements and all function as pin joints, but in that case, they are treated as a part of the intermediary node (6) to be engaged.

[0005]

The operation will be described based on the structure of the present invention. The link between the original node (5), the intermediate node (6), the follower node (2), and the fulcrum shaft holding arm (1) includes three pin contacts and one elastic body. Therefore, although it is not a perfect link mechanism, it does not mean that it is a rigid body and the swing of the link is locked. By installing the elastic body of the fulcrum shaft holding arm (1) with necessary and sufficient elasticity, the above four elements can smoothly perform the following functions.
Now, the force input from the petal shaft (B) by human power is due to the crank lever (4) having a length that is twice as long as the conventional crank length.
It produces twice the rotational torque and 1/2 the rotational angular momentum .
Therefore, the generated work amount is 1 here. The torque is once converted into a linear force via the intermediate node (6) and is transmitted to the follower node (2). The linear force is converted into a rotational torque again by the follower and acts on the hanger shaft (A) fixedly connected.
Since the fulcrum shaft (3) and the crank lever (4) are pivotally attached , the elastic body of the fulcrum shaft holding arm (1) exerts a restoring repulsive force.
Until it is exerted, the force of the crank lever generated around the fulcrum axis is only a moment, and no linear force in the tangential direction on the circumference of rotation is generated. Therefore, during this period, there is no principle where the force is attenuated, and accordingly, twice the rotational torque and 1/2 the rotational angular momentum of the conventional one are transmitted to the hanger shaft (A). Further, since the original joint (5) is installed symmetrically with respect to the crank lever (4), the fulcrum shaft (3) is attached to the fulcrum shaft (3).
No mechanical stress is generated other than the restoring repulsive force of the elastic body, and therefore no stress is transmitted from the fulcrum shaft to the fulcrum shaft holding arm (1). {However, when the intermediate node is a gear as in "Fig. 9", the force is transmitted as it is as a rotational force without changing to a linear force. In this case, a stress that is parallel to the tangential direction of the input and opposite in direction is generated on the shaft that supports the gear as the intermediate node (6) and is transmitted to the fulcrum shaft holding arm (1).
Since stresses of the same force are generated in the fulcrum shaft (3) in opposite directions, they are canceled by each other, and as a result, the fulcrum shaft holding arm (1)
Has zero mechanical stress. } Crank lever (4)
Since the fulcrum shaft holding arm (1) and the fulcrum shaft (3) are rotatably attached to the fulcrum shaft (3), the moment of force is not transmitted,
Therefore, in principle, the rotational torque is not reduced here either. Since the hanger shaft (A) is fixed to the fulcrum shaft holding arm (1) and the follower (2), they make the same periodic motion. Further, since the crank lever (4) and the knuckle (5) are fixed, they make the same periodic motion. Then, the medial node (6) for immediately transmitting the motion is applied to the original node (5) and the follower node (2). Therefore, the movement of the crank lever (4) immediately causes the other required elements of the mechanism to follow an impulsive follow-up movement. The following movement is performed by the fulcrum shaft holding arm (1)
It is made by the repulsion of the spring force that is loaded and accumulated in the body
It As a result, a rotational torque of 1/2 and a rotational angle motion of 1
Bring quantity. Therefore, its work amount is 0.5. Yo
Together with the work done by the crank lever (4) 1
Tar's workload is 1.5. In addition, the same periodic motion in the above means a rotary motion having the same rotational angular velocity with the axis of the hanger shaft (A) as the center of rotation. The fulcrum shaft (3) secures one end of the crank lever (4) by the fulcrum shaft holding arm (1) in a positional relationship in which the fulcrum shaft holding arm (1) is always kept at a constant distance from the axis of the hanger shaft (A). .. On the other hand, the center point of the rotational movement of the crank lever (4) coincides with the axial center position of the hanger shaft (A) in cooperation with the intermediate joint (6) interposed by the required adjustment. And it is the fulcrum shaft (3) that directly guides the rotational movement, but the change in the position of the fulcrum shaft holding arm (1) driven by the crank lever (4 ).
The elastic force of the elastic body. Also, the rotation stroke of the crank lever (4) is the same as the rotation stroke of the crank of the prior art, regardless of the amplification of the length of the crank lever. That is, the radius of rotation is the distance from the petal shaft to the hanger shaft. According to the above, the crank mechanism of the present invention can amplify the rotational torque up to 1.5 times as compared with the crank of the prior art, while having the same rotational stroke. That is, assuming that the conventional crank length is L, the length of the crank lever is twice that of 2L, and the input from the petal shaft is R, the torque generated on the hanger shaft is LR in the prior art, In the crank mechanism of the present invention, 2LR ×
Generates 1/2 the amount of work and is transmitted through the mediators and followers,
As it is, it will generate LR torque on the hanger shaft. Next, by the follow-up motion, the fulcrum shaft holding arm
The repulsion of the spring force of (1) produces a work amount of LR × 1/2.
Therefore, the work force of 1.5 LR is generated by the resultant force of both.
It Now, the length of the crank lever is set according to the following relational expression. 2 x crank length of prior art ≥ length of the crank lever> crank length of prior art + α α is a dead space such as a medial node. {However, in the case of application to a human-powered airplane, it is not necessary to consider the crank ground height, so the length of the crank rehaggy can be doubled or more. } Regardless of the length of the crank lever, the rotation stroke is the same as the crank of the prior art. Therefore, the most efficient crank lever length is to double the crank length of the prior art. Next, the number of gear teeth of the chain ring (7) will be described. Generally, the number of teeth of the front outer gear of the prior art is 50th and the top gear of the rear freewheel is 14th. Gear ratio between front and rear is 6
Should be: Therefore, the chain ring (7)
The appropriate number of teeth is 70 to 80. Further, as a matter of course, since the crank lever can be rotated in the reverse direction so as to idle, just like the conventional bicycle, the driving method is the same as that of the conventional bicycle, and there is no inconvenience.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. First, an embodiment of the fulcrum shaft holding arm (1) will be described. In Fig. 1, the leaf springs are installed in the link mechanism so as to exert the required elastic effect. Therefore, if necessary, the leaf springs are not limited to linear ones, but may be bent to some extent. The leaf spring is installed in the center of the fulcrum shaft holding arm (1), and both ends are fastened with bolts and fixed. In "Figure 11", then the coil spring as an elastic body is obtained by integrally with the pivot shaft holding arm (1) by fixing both ends thereof by welding. In FIG. 12, elastic rubber is used as the elastic body,
It is obtained by integrally with the pivot shaft holding arm (1) by fixing both ends thereof by sticking. In addition, various known elastic bodies can be used as the elastic body. Next, an example of the crank mechanism will be described. [A] A petal shaft (B) is fixedly screwed to one end of the crank lever (4), and a bearing hole (9) is provided at the other end in parallel with the petal shaft (B). An arm serving as a boss (5) is projectingly fixed to the outer peripheral portion of the bearing hole so as to form a right angle with the longitudinal direction of the crank lever and the axial direction of the bearing hole. [B] The fulcrum shaft (3) is attached to one end of the fulcrum shaft holding arm (1).
Is projected and fixed in parallel with the hanger shaft, and a mounting hole (10) for the hanger shaft (A) is provided at the other end,
An arm as a follower (2) is protrudingly fixed to the outer peripheral portion of the mounting hole so as to form a right angle with the longitudinal direction of the fulcrum shaft holding arm and the axial direction of the mounting hole. The mounting hole is inserted into the tip of the hanger shaft and fixed with a fixing bolt (11). {The tip of the hanger shaft (A), which is the joint of the mounting hole (10), has a length about twice that of the conventional one. } [C] The bearing hole (9) of the crank lever (4) is inserted into the fulcrum shaft (3), and a hexagon socket head cap screw having a circular edge forming an edge at the end of the shaft is mounted and shaft mounted. Adjust the fulcrum shaft holding arm (1) and the crank lever (4) so that they overlap with each other when the fulcrum shaft (3) is a turning point, and the arms of the original node (5) and the follower node (2) are adjusted. At the end is a rigid bar as a medial joint (6). [D] Both the original node (5) and the follower node (2) are symmetrically projected and fixed to the crank lever (4), and the bar as the intermediate node (6) is connected to the original node. When the original side and the follower side are pin-jointed together when engaged through the follower, the bar becomes an intermediate node as shown in FIG. 1, and the crank mechanism in the scope of claim 2 is formed. become. “E” When the original node (5) and the follower node (2) are engaged by direct abutting without using the mediating node (6) in the above, the result becomes as shown in FIG. This is the crank mechanism. [F] If the above-mentioned bar is transmitted to the original side and the follower side due to the abutting which is irreversibly butted so that only the pushing force is transmitted as a linear force, the link device as shown in FIG. And the crank mechanism in the scope of claim 2.
{The intermediate node of the link device is formed by pin-joining the connecting rod (12) engaged with the bar by pin-joining to the side surface of the fulcrum shaft holding arm (1). } [G] As another embodiment, the crank mechanism as shown in FIG. 8 in which sprockets are used for the source and the followers and a chain is used as the medium. Further, gears are used for the original node and the follower node, and an odd number of gears are axially mounted on the side surface of the fulcrum shaft holding arm (1) as the intermediate node [FIG. 9].
The crank mechanism like. Also, a wire rope can be used as an intermediary node as shown in FIG. "Figure 1
1 ”and“ FIG. 12 ”have the same meaning as“ FIG. 1 ”, but the elastic body portions of the fulcrum shaft holding arm (1) are mounted and formed by a coil spring and elastic rubber, respectively. [H] "FIG. 13" shows a rigid bar serving as a medium joint (6) provided only on the side on which compressive stress acts at the time of input as a driving force. At this time, the fulcrum shaft holding arm (1) is provided.
A tensile stress will be generated in the shaft, which will affect the transitional movement of the fulcrum shaft (3), but it belongs to the category of "claim 2."

[0007]

As described above, the crank mechanism of the present invention can generate a rotational torque that is 1.5 times as large as that of the crank of the bicycle of the prior art, though it has the same rotational stroke. Therefore, it can be said that the speed can be increased by 1.5 times and the labor can be saved up to 70% . The principle of the crank mechanism of the present invention is widely applied as a crank of an internal combustion engine, a turbine engine, and an output amplifier, and can be used in various fields of energy use, resulting in a great energy saving effect. Technology.

[Brief description of drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a plan view of the present invention.

FIG. 3 is a front view of a right crank mechanism / chaining chain of the present invention.

FIG. 4 is a sectional view of a portion I.

FIG. 5 is a sectional view of a portion II.

FIG. 6 is a perspective view of the present invention.

FIG. 7 is a perspective view of the present invention.

FIG. 8 is a perspective view of the present invention.

FIG. 9 is a perspective view of the present invention.

FIG. 10 is a perspective view of the present invention.

FIG. 11 is a perspective view of the present invention.

FIG. 12 is a perspective view of the present invention.

FIG. 13 is a perspective view of the present invention.

[Explanation of reference signs] A ・ Hanger shaft B ・ Petal shaft C ・ Chen 1 ・ Fulcrum shaft holding arm 2 ・ Following shaft 3 ・ Fulcrum shaft 4 ・ Crank lever 5 ・ Harmones 6 ・ Intermediate node 7 ・ Chain ring 9 ・ Bearing hole 10 ・ Hanger shaft mounting hole in the fulcrum shaft holding arm 11 ・ Fixing bolt 12 ・ Connecting rod in the intermediate node of the link device

Claims (2)

[Claims] (A) One end of a fulcrum shaft holding arm (1) and a follower (2) are fixed to the end of a hanger shaft (A) either directly or by connection. [B] The crank (5) is fixed to the other end of the crank lever (4) having the petal shaft (B) fixed to one end, and the other end of the fulcrum shaft holding arm (1) is connected to the other end through the fulcrum shaft (3). Pin-join. [C] The original (5) and the follower (2) are engaged. [D] The fulcrum shaft holding arm (1) is formed at least partially by an elastic body having a required elasticity. A bicycle crank mechanism configured as described above. 2. The bicycle crank mechanism according to claim 1, wherein the intermediate section (6) is interposed between the original section (5) and the follower section (2).