JPS63284085A - Leg-force drive torque-up device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a leg force drive torque up device mainly used for bicycles.

(Prior Art) A bicycle runs by stepping on a pedal with leg force to rotate a crank arm, and transmitting the rotation of the crank arm to the wheels through a chain or the like.

The length of the crank arm was such that the legs could easily rotate without unnatural bending and stretching movements, and was approximately 17 cm for a normal adult.

In addition, some devices are equipped with a transmission as a means of increasing torque, but increasing the torque by changing speed reduces the speed, and the amount of work relative to the supplied energy remains the same.

(Problems to be Solved by the Invention) In the above-mentioned conventional regular bicycle, the torque is constant and cannot be increased, so it is tiring to drive for a long time and it is difficult to climb up a slope. With this type, the speed decreases as the torque increases, so if you want to achieve the same speed, you have to increase the rotation of the crank arm, which has the problem of not reducing fatigue.

This invention solves the above-mentioned problems of the conventional technology, and makes it possible to increase the torque by normal leg power drive without having to modify the transmission, and also allows for light leg power driving without making the movement of the limbs of the legs unnatural. The object of the present invention is to provide a drive torque increasing device.

(Means for Solving the Problems) In order to achieve the above object, the present invention fixes fixed gears to both ends of a bearing housing that supports the main crankshaft, and base ends to both ends of the main crankshaft. A pair of fixed main crank arms extending in opposite directions are engaged with the respective fixed gears, and rotation of the main crank arms rotates planetary gears that rotate and revolve around the fixed gears. a sub-crankshaft in a direction perpendicular to the main crank arms is rotatably supported at the tips of the pair of main crank arms;
The base ends of sub-crank arms each having a pedal at the tip are fixed to the sub-crankshaft, and the rotation of the planetary gear is controlled to the sub-crankshaft at the same rotation speed as the main crankshaft. the main crank arm and the sub-crank arm extend in a straight line when the main crank arm is in a substantially horizontal state at the front;
This is a leg power drive torque up device.

(Function) In the above configuration, when the main crank arm is rotated by depressing the pedal, the planet gear meshing with the fixed gear revolves around the fixed gear, and the planet gear itself also rotates while the main crank arm rotates once. The rotation of this planetary gear is transmitted to the sub-crankshaft by the rotation transmission means, and the sub-crank arm is at the tip of the main crank arm.
While the main crank arm rotates once, it also rotates once.

This sub-crank arm extends in a straight line with the main crank arm when the main crank arm is approximately horizontal in front, and the distance between the pedal at the tip of this sub-crank arm and the main crankshaft, that is, the driving radius, is The maximum value is ``length + side crank arm length''.

When this main crank arm is positioned forward, it is pressed down with the force of the legs to generate torque, and the larger the driving radius at this time, the greater the torque generated. Therefore, the leg force is small and the crank arm can be driven easily. be.

Furthermore, when the main crank arm moves downward to the lowest vertical position, the main crank arm and the sub crank arm are at right angles, and the drive radius becomes approximately equal to the length of the main crank arm. When the arm moves backward to the horizontal position, the sub-crank arm overlaps the main crank arm, and the driving radius becomes "main crank arm length - sub-crank arm length", which is the minimum, and the main crank arm also overlaps with the main crank arm. When moved to the highest vertical position, the main crank arm and the sub crank arm are at right angles, as in the lowest position, and the drive radius is approximately equal to the length of the main crank arm.

In this way, only when the main crank arm and the sub-crank arm are combined and act as a driving force, the driving radius becomes longer and the torque increases, and in the vertical position, the driving radius is almost the same as that of the main crank arm. Because there is
It can be easily operated with the same drive as normal without putting strain on the bending and stretching movements of the legs.

(Example) Hereinafter, the present invention will be described in detail based on an example in which the present invention is applied to a bicycle shown in the drawings.

(1) is the main crankshaft, which is supported by a bearing housing (2) via a bearing (not shown), and fixed gears (3) (3) are fixedly attached to both ends of the bearing housing (2). There is.

(4) (4) is the main crank arm, and the main crank shaft (1
), the base ends of which are fixed at both ends of the main crank arm (4) and extend in opposite directions, and the base end of one main crank arm (4) is connected to a rear wheel (not shown) via a drive chain (5). The center of the large sprocket (6) for transmitting power is fixed.

(7) (7) is a planetary gear, which has the same number of teeth as the fixed gear (3) (3), meshes with the fixed gear (3) (3), respectively, and connects to the main crank arm (4) (4). The fixed planetary gear shafts (7a) (7a) are rotatably supported, and as the main crank arms (4) (4) rotate, the planetary gears (7) (7) are moved to the fixed gears ( 3)(3)
It revolves around the main crankshaft -1, and also revolves around the main crankshaft -1,
(4) One rotation in (4) also causes one rotation. This planetary gear shaft (7a) (7a) has a driving sprocket (
8) (8) is integrally fixed (9) (9)
is the sub-crank arm, with pedals (10) (10) at the tip.
The sub crankshaft (11) (11
) is fixed to one end of this sub-crankshaft (11) (
A driven sprocket (12) (12) having the same number of teeth as the driving sprocket (8) (8) is provided at the other end of the driving sprocket (8) (8).
3) (13) is a hanging.

(14) (14) (15) (15) are bushings that are driven into the main crank arms (4) (4), and are driven into the planetary gear shafts (7a) (7a) and the sub crank shafts (11) (1
1) are supported.

In the above configuration, when the main crank arm (4) and the large sprocket (6) rotate once around the main crankshaft (1) in the direction of arrow A in Fig. 2, the planetary gear (7)
revolves around the fixed gear (3) once, and since this planetary gear (7) itself has the same number of teeth as the fixed gear (3), it also rotates once in the direction of arrow B, and at the same time this planetary gear ( The driving sprocket (8), which is integrated with 7), rotates once and similarly rotates the driven sprocket (12) once through the interlocking chain (13), so the sub-crankshaft (11) rotates once. and rotate the sub crank arm (9) once in the direction of arrow C.

This main crank arm (4) and sub crank arm (9)
The diagram in FIG. 3 shows the change in the positional relationship during one rotation of the .

In other words, at position (Pl), when the main crank arm (4) is in the forward horizontal state, the sub crank arm (9) is set so as to extend forward in a straight line with the main crank arm (4). The distance from the main crankshaft (1) to the pedal (10), that is, the driving radius, is the sum of the length of the main crank arm (4) and the length of the sub crank arm (9), that is, f-11' = L1 becomes the maximum.

This (Pl) position is the position where the pedal (10) is depressed to generate the most torque, and the driving radius (Ll) at this (Pl) position is the conventional driving radius of the main crank arm (4). The fact that the auxiliary crank arm (9) is longer by 2') than the length l) means that a large torque can be generated or the vehicle can run with light leg strength, which is the position where the effects of this invention are maximized. .

The reason why the driving radius (Ll) is long at this time is that the leg comes out forward, and has almost no relation to the leading toes of the leg, so there is no unnatural movement of the leg.

Subsequently, as it advances to the (P2) and (P3) positions, the main crank arm (4) and the sub-crank arm (9) are bent and the angles are successively sandwiched, so that the drive radius (L2) (L3)
is gradually reduced, and at the lowest position (P4) rotated 90 degrees, it bends 90' with respect to the main crank arm (9), and the driving radius (L4) is the length of the main crank arm (2).
The length is approximated by (P5) (P6), and the angle between the main crank arm (4) and the sub crank arm (9) narrows to less than 90 degrees, and the driving radius (L5) )(L6) becomes shorter sequentially, and (P
When reaching l), the main crank arm (4) and the sub-crank arm (9) overlap, and the drive radius becomes the same as the main crank arm (9).
The difference between the length of 4) and the length of the sub crank arm (9),
That is, f-1'=L7, which is the minimum.

Subsequently, the main crank arm (4) and the sub-crank arm (9) move further upward (P8) (P9), and the bending angle of the main crank arm (4) and the sub-crank arm (9) increases, and the driving radius becomes longer (L8) (L9). , at the top (Plo) position, the bottom (
P4) As in the position, the main crank arm (4) and the sub-crank arm (9) are bent at 90 degrees, and the drive radius (LlO) is approximately the length of the main crank arm 2). (pH) (Pl2) and proceed in the forward downward direction to connect the main crank arm (4) and the sub crank arm (9).
), the driving radius (Lll) (L12) gradually becomes longer, returns to the forward horizontal position (Pl), and the driving radius (Ll) becomes maximum as described above.

In this way, the driving radius changes during one rotation, but the lowest (P
4) The vertical distance between the position and the highest (PIO) position determines the degree of flexion and extension of the leg, which is almost the same as in the case of only the conventional main crank arm (4).
The degree of flexion of the legs is normal, and problems such as difficulty in driving do not occur.

Also, during the backward rotation from the (P4) position to the (Pl2) position, the driving radius is the length of the main crank arm (4) f)
Although it will be shorter, no problem will occur because this period is a return after generating torque between forward % rotations and is unrelated to torque.

As described above, the trajectory of the pedal (10) is approximately circular as shown by the line (Q), and the trajectory of the tip of the main crank arm (4) (R
) The center of the circle is moved slightly forward of the circle,
There is no major change in the driving position.

In addition to the above-mentioned application to bicycles, the present invention can also be used as a power source for other types of water play equipment, for example.

(Effects of the Invention) According to the leg power drive torque increasing device according to the present invention described above, when the pedal is normally depressed to drive, the drive radius is extended and a large torque is generated when the pedal is depressed to generate torque. There is nothing forced or unnatural about the leg movements, and applying this to cycling can reduce fatigue, allowing you to speed up, endure long rides, and improve your pitching ability. It is.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the case where this invention is applied to a bicycle as an embodiment of the invention, Fig. 2 is a view of Fig. 1 seen in the direction of the FIG. (1) Main crankshaft (2) Bearing housing
(3)...Fixed gear (4)...Main crank arm (
7) ... Planetary gear (8) ... Driving sprocket (9
) Sub-crank arm (10)...Pedal (11)...
・Sub-crankshaft (12)...Driven sprocket (1
3)...Interlocking chain

Claims (1)

[Claims] Fixed gears are fixed to both ends of a bearing housing that supports the main crankshaft, and each of the fixed gears is attached to a pair of main crank arms whose base ends are fixed to both ends of the main crankshaft and extend in opposite directions. The planetary gears are meshed with the main crank arms and rotatably support planetary gears that rotate and revolve around the fixed gears by the rotation of the main crank arms. The base ends of sub-crank arms each having a pedal at the tip are fixed to the sub-crankshafts, and the rotation of the planetary gear is controlled to the sub-crankshafts. , a rotation transmitting means is provided for transmitting rotation so that the sub-crankshaft rotates at the same rotation speed as the main crankshaft, and when the main crank arm is in a substantially horizontal state in front, the main crank arm and the sub-crank rotate. A leg power drive torque increase device characterized in that an arm is configured to extend in a straight line.