JPH0539080A - Crank mechanism for bicycle provided with fulcrum - Google Patents

Abstract

PURPOSE:To increase the speed of a bicycle by providing a fulcrum shaft on a crank lever provided with a pedal shaft mounted on its one end, and constituting the mechanism so as to transmit, to a driver, the resultant force of moment due to a force around the shaft and moment due to reaction force generated on the shaft. CONSTITUTION:By the force input from a pedal shaft B by human power, moment of force around a fulcrum shaft 4c is generated due to the principle of a lever, and the fore is once converted to a linear force through the pin joint of a lever operating point shaft 4f and transmitted to a mediator 4a on the extreme end of a crank lever. It is converted again to the moment and transmitted to a driver 5. Meanwhile, reaction force generated on the fulcrum shaft 4c pin-jointed to the crank lever 4 is transmitted to a fulcrum shaft holding arm 4b rigidly jointed to the shaft 4c at its one end, and hence moment is generated on the driver 5 fixedly secured on the other end of the holding arm 4b in rigid joint. Namely, the resultant force of the two moment is generated on the driver 5, and this force is transmitted to a follower 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a crank lever having a longer crank length than that of a conventional crank lever, and a rotary torque amplified several times by adding a lever function to a master lever, a mediator node,
The present invention relates to a crank mechanism of a bicycle, which is transmitted from a hanger shaft to a chain ring through a follower. Incidentally, the present invention was filed by the same applicant as the applicant in the past for "patent number 001, date of submission: July 2, 1991, and title of the invention: crank mechanism of bicycle with doubled crank length" It is a product with improved functions and improved performance.
Therefore, the "conventional technique" means the above-mentioned "bicycle crank mechanism in which the crank length is doubled", and the comparative study will mainly describe the points of improvement in comparison therewith. Hereinafter, the above-mentioned "bicycle crank mechanism with doubled crank length" will be referred to as "prior art", and the general bicycle crank that is now widespread will be referred to as "so-called conventional technology". .. It should be noted that the crank mechanism does not function only by the scope of the claims, but it fully functions as the crank mechanism only in combination with the above-mentioned prior art.

[0002]

2. Description of the Related Art As a prior art, 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 connected to each other, while a petal shaft (B) is attached. A crank (5) is fixed to the other end of the crank lever (4) which is fixed to one end, and is pin-joined to the other end of the fulcrum shaft holding arm (1) through the fulcrum shaft (3). ) And the follower (2) via the intermediary (6), a bicycle crank mechanism has been invented and applied for a patent by the same applicant as the applicant. The above-mentioned prior art can obtain about twice the rotational torque with the same rotational stroke as compared with the so-called conventional bicycles that are currently widespread, and therefore about twice the speedup or about two-half minutes. It is possible to save 1 labor, but it is not possible to have more performance.

[0003]

The length of the crank lever in the prior art is limited to about twice the so-called conventional crank length because the height of the ground above the crank must be taken into consideration in view of the function of the bicycle. .. So in prior art bicycles,
2 with the same rotation stroke compared to the so-called conventional bicycle
The limit is to obtain double the rotational torque. The present invention aims to eliminate the above-mentioned drawbacks. That is, the rotational torque is to be increased five times or more as compared with the so-called conventional technique while keeping the rotational stroke the same as the conventional one. By doing so, it is possible to increase the speed by about 5 times or more compared with the so-called conventional technology, or to save a great deal of labor.

[0004]

The structure of the present invention will be described, including the relation to the prior art: [a] One end of the fulcrum shaft holding arm (1) and a follower at the end of the hanger shaft (A). (2) is fixedly connected, and the original node (5) is pivotally attached to the other end of the fulcrum shaft holding arm (1) via the fulcrum shaft (3) as a rotatable pin joint. One end of the lever fulcrum shaft holding arm (4b) is rigidly fixed to the original joint (5), and the lever fulcrum shaft (4c) is projectingly provided at the other end. [B] A bearing hole is provided in the crank lever (4) having the petal shaft (B) fixed to one end, and the shaft is formed as a rotatable pin joint with the lever support shaft holding arm (4b) via the lever support shaft (4c). To wear. [C] The front end of the crank lever is referred to as a crank lever lever action point portion (4e), which is installed as a lever function action portion, and is connected to one end of the crank lever tip intermediate node (4a) via the lever action point shaft (4f). It is attached as a rotatable pin joint. [D] The other end of the crank lever tip intermediate node (4a)
It is attached to the master (5) as a rotatable pin joint by using the shaft of the master. [E] In the above configuration, the central axes of the fulcrum shaft (3), the lever fulcrum shaft (4c), the hanger shaft (A), and the petal shaft (B) are on the same plane or close to each other. , And the fulcrum shaft (3) and petal shaft (B)
Adjust so that the lever shaft (4c) and the hanger shaft (A) come between them. It is configured as above,
It is a bicycle crank mechanism with a lever. Incidentally, if a little explanation is added to the concept of the element, since the crank lever (4) and the crank lever lever action point portion (4e) are formed as one component, they are originally one element,
Therefore, it is generally called by one name, but for the purpose of explanation of the function of the mechanism, the names are divided into the above two names. Further, the original node (5) and the fulcrum shaft (3), the fulcrum shaft holding arm (1) and the follower node (2), the crank lever tip mediating node (4a) and the lever action point shaft (4f), the original node (5). ), The lever support arm (4b), the lever support shaft (4c), etc., are integrally formed into one part, which is generally one element and is generally called by one name. In the explanation of the function of the mechanism, the name is divided into different names.
It shall be treated as a set of separate elements. However, the hexagon socket head cap screws with circular edges forming the leading edge of each shaft are treated as a part of the shaft to which they are screwed, and are therefore designated by the same reference numerals. Further, the shaft that plays the role of pin joint between the follower (2) and the intermediate joint (6) is included in the element to which the shaft is fixed. Similarly, a shaft that plays a role of pin joint in the engagement between the original node (5) and the crank lever tip intermediate node (4a) or the intermediate node (6) is included in the element to which the shaft is fixed. And Therefore, the two types of axes are designated by the same reference numerals and names as a part of the included elements. The two kinds of shafts are not fixed to any of the engaging elements and all function as pin joints, but in that case, a part of the engaging master (5) or follower (2) is engaged. Shall be treated as

[0005]

The operation will be described based on the structure of the present invention. Peta
The force input by human power from the le shaft (B) is
Due to the principle of U, the force of force is moved around the lever fulcrum axis (4c).
Generate an event. The moment is the lever action point axis (4
The same value is transmitted around f) and through the pin joint of the shaft
Once changed to a linear force, the crank lever tip intermediate node (4
It is transmitted to a), and again through the pin joint of the shaft of the original node (5).
It is transformed into a moment of force and is transmitted to the original clause (5). {However
However, in the case of "Figs. 6 and 7", around the lever fulcrum axis (4c)
The moment of force generated on the
The rotational force is transmitted to the original clause (5). } On the other hand, Crankle
Delivered on the lever shaft (4c) that is pin-joined to the bar (4).
The generated reaction force is a lever fulcrum shaft whose one end is rigidly joined to the shaft.
It is transmitted to the holding arm (4b) and is rigidly joined at the other end of the holding arm.
Generate a moment of force on the worn master (5)
It Therefore, the above-mentioned two acting in the same direction on the original node (5).
The moments of two forces are transmitted at the same time, and the resultant force
Will occur in the original clause (5). That is, Petalsha
Generated from the force input from the ft (B) by human power
All the power can be effectively transmitted to Harajuku (5) without waste.
Become. Next, the moment of force transmitted to the original clause (5) is
Through the pin joint of the shaft of the master (5)
Is transmitted to the mediator (6) and then to the follower (2). Follower
In (2), the handker changed to the moment of force and fixed.
-Transmitted to the shaft (A) as rotational force. Same at the same time
A fulcrum shaft holding arm (1) rigidly joined and fixed to the follower
By rotating the fulcrum shaft (3) to the required position
Inevitably, the rotation stroke of the crank mechanism concerned is always secured.
The center point of the rook is the axis of the hanger shaft (A), or
Hold at that approximate point. The moment of force in the clause (5)
Fulcrum shaft holding arm (1)
It has a rotatable pin joint via the fulcrum shaft (3).
Then, no mechanical force is applied to the fulcrum shaft holding arm (1).
No Therefore, depending on the input from the petal shaft (B)
All the force generated by the hanger shaft (A)
Acts as the rotational torque of. The above is a differential explanation
Therefore, all these movements are chased simultaneously and indiscriminately.
It moves and occurs continuously. Next, the operation will be explained using numerical values.
It Now, let's say Petal Shaft (B) and Hanger Shaft.
Let L be the distance between the axes of (A) and the fulcrum axis (3)
The distance between the axes of the le shaft (B) is 2L. Lever
Set the position of the shaft center of the fulcrum shaft (4c) to that of the petal shaft (B).
At a distance of (5/8) × 2L = (5/4) L from the axis
The distance of the lever action point from the axis of the lever fulcrum shaft (4c)
It shall be at the position of (1/8) × 2L = (1/4) L
It {However, the lever action point is from the lever action point axis (4f)
At the intersection of the perpendiculars drawn to the central axis of the crank lever (4)
is there. } At this time, the force of R from the petal shaft (B)
If you enter it, the power generated at the lever action point is 5R
Yes, this is the moment around the lever axis (4c)
The component is 5R × (1/4) L = 1.25LR. this
The moment is transmitted around the lever action point axis (4f),
From here, linear force is temporarily applied at the crank lever tip intermediate node (4a).
It is transmitted to the original clause (5). On the other hand, the lever fulcrum axis (4
A reaction force of (R + 5R) = 6R is generated in c). This reaction force
Is transmitted to the lever support shaft holding arm (4b), and (2L-5L /
4) × 6R = 4.5LR Force of moment to the original clause (5)
Give rise to. Therefore, in the original clause (5), a moment of 1.25LR + 4.5LR = 5.75LR occurs as a resultant force. This power is the medium
In (6), it is converted into a linear force and transmitted to the follower (2).
It becomes rotational force again and is transmitted to the hanger shaft (A).
It With a so-called conventional crank mechanism, rotation of the LR
Since only the force can be obtained, even if the crank mechanism
In that case, a rotational force that is 5.75 times that is obtained. Up
In general, the relational expression of force is: L; Petal shaft (B) and hanger shaft (A)
Distance between each shaft center 2L; Between each shaft center of the petal shaft (B) and the fulcrum shaft (3)
R: Input at petal shaft (B) K: Force generated at lever action point Between each axis of petal shaft (B) and lever fulcrum shaft (4c)
Distance; 2L × (x / m) = (2Lx / m) where m,
x is an integer of m> x The distance from the lever action point to the axis of the lever fulcrum axis (4c); 2L × (1 / n) = (2L / n) where n is an integer
If it is a number, K × (2L / n) = R × (2Lx /
m) ∴ K = (nx / m) R K exerts moment around lever axis (4c)
Is: (nx / m) R × (2L / n) = (2Lx / m) R Reaction force generated on the lever fulcrum shaft (4c); K + R = (nx⁺m / m) R mechanically effective length of the lever support shaft holding arm (4b); 2L- (2Lx / m) = 2L (m⁻x / m) The reaction force generated on the lever fulcrum shaft (4c) causes momentum (5).
Force acting as an event; (nx⁺n / m) R × 2 L (m⁻x / m) = 2LRn
(X⁺1) (m⁻x) / m^Two  The resultant force of the moment in the original clause (5) is: 2LR (x / m) + 2LRn (x⁺1) (m⁻x) / m^Two It becomes like above. Incidentally, a so-called conventional bicycle crank
Just like the above, the crank mechanism can be rotated in the reverse direction.
Since it can be done, there is no inconvenience in driving operation.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. [A] A petal shaft (B) is fixedly screwed to one end of the crank lever (4), and a bearing hole for the lever fulcrum shaft (4c) is provided at an effective arbitrary position. As the lever lever action point portion (4e), the crank lever and the petal shaft are made to be at right angles to each other, and are installed by being rigidly joined and projected. A bearing hole is provided at the end of the crank lever lever action point portion, and is pivotally attached to a lever action point shaft (4f) rigidly fixed to one end of the crank lever tip intermediate node (4a). The other end of the crank lever tip medial node is pinned to the shaft at the end of the original node (5) in a pin joint. At the other end of the lever support shaft holding arm (4b) fixed in parallel with the crank lever (4) by rigidly joining one end to the original joint (5), the lever support shaft (4c) is provided in parallel with the petal shaft. It is fixedly protruded, and is pivotally attached to the bearing hole of the crank lever (4) by a rotatable pin joint. Crank lever tip intermediary node (4
A) effectively transmits both the tensile force and the compressive force as shown in FIGS. It is installed by using a hard rod-shaped object and a wire rope or chain that effectively transmits only the pulling force. Alternatively, it can be installed by using an abutment rod that transmits only the compression force or a gear that transmits the rotation force as it is. The above is the main part of the claim which belongs to the category of "Claim 2". From the source node to the intermediate node (6) to the follower node (2) to the fulcrum shaft holding arm (1) to the fulcrum shaft (3). -The structure of the master and the engagement with the hanger shaft (A) are formed according to the prior art. [B] By omitting the crank lever tip intermediate node (4a) and the lever action point shaft (4f) from the configuration of the above item "a", the crank lever lever action point part (4e) is directly attached to the original node (5). The one constructed so as to abut against each other and transmit only the compressive force is shown in FIG. 6 and belongs to the category of “Claim 1”. In addition, in order to prevent wear due to abutting, the crank lever lever action point part (4e)
It is also possible to mount the abutting part of the device on a rotatable roller, or mount the abutting mutual elements on the pinion and the rack. [C] Next, an example of FIG. 7 will be described. This belongs to the category of "Claim 3". On the side surface of the fulcrum shaft holding arm (1), in parallel with the hanger shaft (A) and in the opposite direction, the fulcrum shaft (4) for the crank lever tip intermediate node is provided.
d) is fixedly installed in a rigid joint so as not to contact the lever support shaft holding arm (4b), and the crank lever tip intermediate node (4a) is rotated at the other end of the shaft (4d). It is attached as a free pin joint. One end of the intermediate node (4a) is pivotally attached to the crank lever lever action point portion (4e) through a lever action point shaft (4f) as a rotatable pin joint, and the other end is formed into a gear to be mounted. Set up. A part of the original node (5) is fixedly installed as the original node end supplementary gear (5b) so as to inherit the force from the gear of the intermediate node (4a). In this case, the fulcrum axis (3)
Shall be fixed to both ends of the required part of the original section (5). The crank mechanism is characterized by the above, and other configurations are formed in accordance with the item "a" in the preceding paragraph. Hereinafter, the effectiveness of the crank mechanism will be described using numerical values. R: Input from petal shaft (B) L: Distance between shaft center of petal shaft (B) and crankshaft (A) 2L: Distance between shaft center of petal shaft (B) and fulcrum shaft (3) (5 / 4) L; Distance between the shaft center of the petal shaft (B) and the lever fulcrum shaft (4c) Distance between the shaft center of the lever fulcrum shaft (4c) and the lever action point shaft (4f); (1/4) L Lever action point axis (4f) and crank lever tip intermediate node fulcrum axis (4
d) Distance between shaft centers; (1/4) L Crank lever tip intermediate node fulcrum shaft (4d) Distance between shaft centers of fulcrum shaft (3); (1/4) L Moment of force generated around (4c);
(5/4) LR ... i This is a rotational force that is transmitted through each element to be connected and acts on the hanger shaft (A) as it is. Reaction force generated on the lever fulcrum shaft (4c); 6R This is the fulcrum shaft (3) via the lever fulcrum shaft holding arm (4b).
Moment of force generated around 6R × (3 /
4) L = (18/4) LR..ii This is the rotational force that acts on the hanger shaft (A) as it is transmitted through the connected elements. Reaction force generated on the fulcrum shaft (4d) for crank lever tip intermediate node; 10R Moment of force generated around the slave node (2) via the fulcrum shaft holding arm (1); (3/4) L × 10
R = (30/4) LR · iii This is the rotational force that acts on the hanger shaft (A) as it is. Therefore, the resultant force of the rotational forces acting on the hanger shaft (A) is; i + ii + iii, that is, (5/4) LR.
+ (18/4) LR + (30/4) LR + 13.25L
Therefore, in the case of the crank mechanism, a rotational force 13.25 times that of the so-called conventional technique can be obtained. If the position of each fulcrum shaft is adjusted properly, it is possible to obtain a so-called rotational force about 15 times that of the conventional technique.

[0007]

As described above, the crank mechanism of the present invention can generate a rotational torque about 5 to 15 times higher than that of a so-called conventional crank mechanism of a bicycle, even though the crank stroke is the same. Therefore, in principle 5 times to 1
It is possible to speed up by 5 times, and also 1/5 to 1
It means that the labor saving of the 15th place can be done. In addition, the principle of the crank mechanism of the present invention is widely applicable to all crank-usable machines such as cranks of internal combustion engines, turbine engines, and other output amplifiers, and can be used in various fields of energy creation and use. This is an epoch-making technology that brings great effects.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a portion I.

FIG. 3 is a sectional view of a portion II.

FIG. 4 is a sectional view of a part III.

FIG. 5 is a cross-sectional view of the IV part

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.

[Explanation of symbols]

 A ・ Hanger shaft B ・ Petal shaft 1 ・ Fulcrum shaft holding arm 2 ・ Following shaft 3 ・ Flange shaft 4 ・ Crank lever 4a ・ Crank lever tip intermediary node 4b ・ Lever fulcrum shaft holding arm 4c ・ Lever fulcrum shaft 4d ・ Crank lever tip Medial joint fulcrum shaft 4e ・ Crank lever lever action point part 4f ・ Lever action point axis 5 ・ Harmonet 5b ・ Harmonet end supplementary gear 6 ・ Harness node 11 ・ Fixing bolt

Claims (3)

[Claims] [1] A crank lever (4) having a petal shaft (B) at one end is provided with a lever fulcrum, and a crank lever lever action point portion (4e) is provided. [B] One of the lever support arm (4b) is fixed to the original joint (5), and the other end is pin-joined to the crank lever (4) through the lever support shaft (4c). [C] The master (5) and the crank lever lever action point (4
e) is engaged. A bicycle crank mechanism provided with a lever fulcrum configured as described above. 2. A bicycle crank mechanism provided with a lever fulcrum according to claim 1, wherein a crank lever tip intermediate node (4a) is provided between the original node (5) and the crank lever lever action point portion (4e). .. 3. The fulcrum shaft holding arm (1) is equipped with one end of a fulcrum shaft (4d) for crank lever tip mediating node, and the other end is engaged with the crank lever tip mediating node (4a). Bicycle crank mechanism with lever lever.