JPH08318889A - Bicycle - Google Patents

Abstract

PURPOSE: To provide a bicycle which can be run easily not only on a plain road, but also in an uphill climbing condition, and furthermore, can reduce the fatigue of legs in a long distance running condition. CONSTITUTION: A circular body 2 making a position 10 eccentirc to the front side to the axial center of a crankshaft 8 as the rotating center is provided. A crank member 9 with a pedal 4, and an arm member 5 are installed to the circular body 2. The front ends of the arm member 5 and of a carnk 7 attached to the crankshaft 8, are combined each other by a combining member 6. And the cricular body 2 is installed in a circular body holding member 3 to hold the circular body 3 rotatable around the rotary center.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a bicycle.

[0002]

2. Description of the Related Art In a conventional bicycle, a pedal rotates about a crankshaft as an axis to generate a driving force.

[0003]

Therefore, when climbing a slope having a slight inclination, it is very hard work, and the legs are easily fatigued when traveling a long distance.

Therefore, the present invention solves the above-mentioned problems,
An object of the present invention is to provide a bicycle which can easily climb a slope only by human power and can reduce the fatigue of legs even when traveling a long distance.

[0005]

In order to achieve the above-mentioned object, a bicycle according to the present invention has an annular body whose center of rotation is a point eccentric to the front of the axis of a crankshaft, and the annular ring. A pedal-equipped crank member and an arm member attached to the body, a crank member attached to the crankshaft, a connecting member for mutually connecting the respective tip portions of the arm member, and the annular body around the rotation center. A ring-shaped body holding member that holds the body in a rotatable manner and a drive mechanism that includes the body are provided.

[0006]

[Operation] By rotating the pedal with the force of the leg--that is, by rotating the torus--the arm member rotates about an eccentric point (from the axis of the crankshaft) as the center of rotation, and the rotation force of the arm member is changed. It is transmitted to the crank through the connecting member,
The crank rotates about the crankshaft (the crankshaft rotates), and the driving force is transmitted to the rear wheels by the front gear and the chain, so that the bicycle can run.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments.

FIG. 1 shows an embodiment of a bicycle according to the present invention, which has an annular body 2 whose center of rotation is a point 10 which is eccentric forward with respect to the axis of the crankshaft 8. A crank member 9 with a pedal 4 having a predetermined length and an arm member 5 are attached to the annular body 2 with bolts 17 ...

A holding member 3 fixed to the frame 1 of the bicycle body 15 holds the annular body 2 rotatably around the rotation center. The annular body 2 is mounted in the holding member 3 via, for example, a ball bearing, a roller (not shown) or the like, and frictional resistance due to rotation is reduced.

The crank 7 attached to the crankshaft 8 and the tip of each of the arm members 5 are connected to each other by connecting pins 11a and 11b by a connecting member 6 having a predetermined length. Therefore, the connecting portion of the connecting member 6, the crank 7 and the arm member 5 can move within a predetermined range.

The crankshaft 8 is firmly connected to a chain wheel 12 having a front gear 13, and a chain 14
The front gear 13 and the rear gear 16 are connected to each other, and a leg force 19 caused by an occupant (not shown) stepping on the pedal 4 rotates the crank 7 and the crankshaft 8 via the arm member 5 and the connecting member 6. The turning force 20 is transmitted to the rear wheels and the bicycle body 15 can be run forward.

As shown in FIG. 2, parts of this drive mechanism are attached to the left and right of the bicycle body 15 so as to increase the driving force of the bicycle body 15 and maintain the balance of the bicycle body 15.

2 to 5, the leg force 19 is applied to the left and right pedals 4 and 4 to rotate the annular bodies 2 and 2 in the rotational direction 18.
When rotated to the left, the left and right arm members 5 and 5 rotate the left and right cranks 7 and 7 via the connecting members 6 and 6, and the driving force is transmitted to the crankshaft 8.

2 and 3, force 19 is applied to the pedal 4 by the left leg of a person (not shown), and then, as shown in FIGS. 4 and 5, force 19 is applied to the pedal 4 by the right leg. To be
By repeating this, the bicycle body 15 moves forward.

However, the range in which a person can apply the leg force 19 to the pedal 4 is only in the range of the forward semicircle (of the path of the pedal) where the pedal 4 is depressed from the uppermost position to the lowermost position. Therefore, if the largest possible rotational force 20 is applied during this period, the driving force of the bicycle body 15 also increases in proportion thereto.

FIG. 6 shows a state in which the annular body 2 rotates about a point 10, and the trajectory drawn by the center points of the connecting pins 11a and 11b of the arm member 5 and the crank 7 (broken line) 21a. , 21b. In the range of the front semicircle of the pedal 4, the track 21a of the connecting pin 11a of the arm member 5 is outside the track 21b of the connecting pin 11b of the crank 7.

When the connecting pin 11a of the arm member 5 is at the position P ₁ farthest from the axis of the crankshaft 8, the pedal 4 (shown in phantom) is set at the lowest position. At this time, assuming that the annular body 2 is rotating in the rotation direction 18, the arm member 5 gives a rotating force 20 to the crank 7 via the connecting member 6, and the position P on the track 21a is applied.
₁ produces the largest rotational force of 20.

The rotating force 20 generated by the annular body 2 having the eccentric point 10 as the center of rotation passes through the position P ₂ where the connecting pin 11a of the arm member 5 intersects the track 21a and the track 21b. , P ₁ and increasing.

Further, in FIG. 2, the rotation angle from the front horizontal pedal 4 (shown by the solid line) to the pedal 4 in the direct downward direction (shown by the phantom line) is 90 °, whereas the rotation angle is shown by the solid line (shown by the solid line). The rotation angle θ from the crank 7 (indicated by) to the crank 7 (indicated by an imaginary line rotated accordingly) is θ <90 °.
That is, in this range, deceleration is performed by the structure of the present invention, and the rotational torque applied to the pedal 4 increases (in the range from the solid line to the phantom line in the drawing) and the crank 7 increases.
It can be seen that it is transmitted to (crankshaft 8).

Therefore, as shown in FIG. 7, the position of the pedal 4 from the pedal 4 (shown by the phantom line) to the pedal 4 (shown by the solid line) where it is difficult to apply the leg force 19 to the pedal 4--reference numeral G in FIG.
In the range of-, it is possible to achieve a sufficient increase of the rotational torque.

When the pedal 4 is at the lowermost position, the pedal 4 (not shown) on the opposite side of the bicycle body 15 is at the 180-degree position, that is, the uppermost position, so that By applying the force 19 by the right leg (not shown), the rotational force 20 from the arm member 5 is applied to the crank 7, and the above-mentioned effect is produced (see FIGS. 4 and 5).

A bicycle equipped with this bicycle drive mechanism may be equipped with a gear shift mechanism that allows a plurality of gears to be attached to the rear wheels to change the gear ratio.

[0023]

Since the present invention is configured as described above, it has the following effects.

Since a relatively large rotational torque can be generated (in the range G in FIG. 7), the bicycle main body 15 can be easily run when climbing a slope. Also,
It is possible to reduce the fatigue of the legs even when traveling a long distance.

Since the drive mechanism uses only human power and can be made with relatively few parts, it is inexpensive and does not break down.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view showing one embodiment of the present invention.

FIG. 2 is a first state diagram showing driving of the bicycle body.

FIG. 3 is a second state diagram showing driving of the bicycle body.

FIG. 4 is a third state diagram showing the driving of the bicycle body.

FIG. 5 is a fourth state diagram showing driving of the bicycle body.

FIG. 6 is a state explanatory view of a drive main part.

FIG. 7 is another state explanatory view of the drive main part.

[Explanation of symbols]

 2 torus 3 torus holding member 4 pedal 5 arm member 6 connecting member 7 crank 8 crankshaft 9 crank member 10 points

Claims (1)

[Claims] 1. An annular body 2 whose center of rotation is a point 10 which is eccentric to the axial center of a crankshaft 8, a crank member 9 with a pedal 4 and an arm member 5 attached to the annular body 2. A crank 7 attached to the crankshaft 8 and a connecting member 6 for connecting the respective tip portions of the arm members 5 to each other; and an annular ring for holding the annular body 2 rotatably around the rotation center. A bicycle having a drive mechanism including a body holding member (3).