JPH037275Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a bicycle drive mechanism in which the rear wheel can be rotationally driven by alternately depressing the left and right pedals.

<Prior art> In conventional bicycles, a chain belt is hooked between a petal gear that rotates integrally with the pedal and a drive gear provided on the rear wheel, and the pedal is rotated by a chain belt.
Rotates the petal gear by rotating 360 degrees,
This rotation is transmitted to the rear wheels via a chain belt.

<Problem that the invention seeks to solve> However, the conventional drive mechanism always moves the pedal 360 degrees.
degrees of rotation, creating an area where the efficiency of converting foot force into rotational drive force is low. For example, when pressing one pedal from the highest position,
The rotational driving force can be efficiently generated for a while after the pedal starts to be depressed, but as the pedal approaches the lowest position, the rotational driving force weakens.

Also, for people with lameness, it is important to keep the petal on hand at all times.
Having to turn 360 degrees was not only inconvenient but also painful.

For this reason, there has been a desire to develop a bicycle that can efficiently convert the power of the legs into rotational driving force, and that can be ridden by simply moving the pedals up and down within a desired range without having to rotate the pedals 360 degrees.

<Means for Solving the Problems> The present invention was proposed in view of the above, and includes a pair of first bevel gears arranged left and right facing each other, each supported by a petal shaft, and a second bevel gear arranged between both first bevel gears. The bevel gears are engaged to make the rotation directions of both first bevel gears different, and a petal gear is fixed to each petal shaft extending left and right, and the base end of the petal lever is fixed, so that the petal provided at the tip of each petal lever is attached to the petal shaft. An intermediate shaft is provided in the left-right direction between the petal shaft and the axle of the rear wheel, and a pair of intermediate first chain gears each having a freewheel are attached to the intermediate shaft. Two chain gears are fixed, a first chain belt is hooked between the intermediate first chain gear and the petal gear, and the intermediate first chain gear is driven by the corresponding petal gear, and the drive gear provided on the axle of the rear wheel and the above are connected. middle 2nd
A second chain gear is hooked between the chain gear and the chain gear.

<Operation> When the right side pedal is depressed, the petal gear on the side of the petal rotates in the forward direction, and this rotational force is transmitted to one intermediate first chain gear via the first chain belt, thereby rotating the intermediate shaft. When the intermediate shaft rotates, the second intermediate chain gear, the second chain gear,
and the drive gear rotates, thereby rotating the rear wheel in the direction of travel of the bicycle. Also, when you step on the right pedal, the first bevel gear on the right rotates in the forward direction.
The first bevel gear on the left side rotates in reverse via the second bevel gear meshed with the first bevel gear. Therefore, the left petal rises.

When the left pedal is depressed, the petal gear on that side rotates in the forward direction, and this rotational force is transmitted to the other intermediate first chain gear via the first chain belt, thereby rotating the intermediate shaft. When the intermediate shaft rotates, the second intermediate chain gear, the second chain gear,
and the drive gear rotates, thereby rotating the rear wheel in the forward direction of the bicycle.

Therefore, if you alternately press the left and right pedals, the rear wheel will continue to rotate in the forward direction of the bicycle.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

The bicycle drive mechanism is composed of a petal gear drive section A, an intermediate gear section B, and a rear wheel drive section C.

In this embodiment, the petal gear drive section A includes petal levers 1a, 1b, petal gears 2a, symmetrically,
2b, and inside the case 3 disposed at the center are first bevel gears 4a,
4b, and first bevel gears 4a, 4
The petal shafts 5a, 5b of b protrude from the case 3, and the petal gears 2a, 2b and the base end portions of the petal levers 1a, 1b are supported on the ends thereof, and a second bevel gear 6a is disposed between the first bevel gears 4a, 4b. , 6b are engaged with each other to form the first bevel gear 4.
a and the first bevel gear 4b are configured to rotate in opposite directions.

Therefore, in this embodiment, when stepping on the petal 7a provided at the tip of the right petal lever 1a,
As the petal gear 2a rotates in the depression direction, the corresponding first bevel gear 4a on the right side is rotated in the same direction. The rotation of the first bevel gear 4a is transmitted to the left first bevel gear 4b via the second bevel gears 6a and 6b, and rotates the left petal gear 2b and the petal lever 1b in the opposite direction to the direction in which the right petal 7a is depressed. and raise the petal 7b provided at the tip of the petal lever 1b to the depressed position.

In other words, press one pedal (downward)
Then, the other petal rises and returns to the depressed position. Therefore, the pedals can be depressed alternately without the need for a separate operation to raise the descended pedals to the depression position.

The intermediate gear portion B includes an intermediate shaft 8 inserted in the left-right direction of the vehicle body, a pair of intermediate first chain gears 9a and 9b supported on both ends of the intermediate shaft 8, and fixed to one end of the intermediate shaft 8. In this embodiment, threaded portions 11, 11 are provided at both ends of the intermediate shaft 8 to prevent reverse rotation, and intermediate first chain gears 9a, 9b, intermediate second chain gears 10 are provided. is screwed onto the threaded portions 11, 11 for bearing support. Note that the above-mentioned intermediate first chain gears 9a and 9b are gears that are rotationally driven by a chain belt of a bicycle, so they are not compatible with the well-known freewheel 9'.
(Figure 3).

The drive unit C is constituted by a drive gear 14 supported on the axle 13 of the rear wheel 12, and first chain belts 15a, 15 are provided between the above-mentioned petal gears 2a, 2b and intermediate first chain gears 9a, 9b, respectively.
b is hooked, and a second chain belt 16 is hooked between the intermediate second chain gear 10 and the drive gear 14.

In the above configuration, the right petal 7a
When you step down and rotate the petal gear 2a in the forward direction,
The intermediate first chain gear 9a follows this, and when the intermediate second chain gear 10 rotates via the intermediate shaft 8 due to the forward rotation of the intermediate first chain gear 9a, the intermediate second chain gear 10 and the drive gear 14 are rotated to the second chain. Since they are connected by a belt 16, the drive gear 14 rotates, and the rear wheels 12 rotate in a direction that moves the vehicle forward. Note that when the right side petal 7a is depressed to rotate the petal gear 2a in the forward direction, the first bevel gears 4a, 4b and the second bevel gears 6a, 6b are rotated.
Due to the action of
Although the chain gear 9b rotates in the reverse direction, the intermediate second chain gear 9b only rotates around the intermediate shaft 8 due to the freewheel 9'.

Also, when the left pedal 7b is depressed and the petal gear 2b is rotated in the forward direction, the intermediate first chain gear 9
b follows this, and thereafter, the drive gear 14 rotates in the same manner as described above, and the rear wheels 12 rotate in a direction that moves the vehicle body forward.

<Effects of the invention> As explained above, according to the invention, the intermediate shaft can be rotated by simply stepping on the left and right petals alternately, without having to rotate them 360 degrees, and the rotational force of the intermediate shaft can be transferred to the rear wheels. can be transmitted. Therefore, the driving force generated by pressing the pedal can be transmitted to the rear wheels without loss, and the vehicle body can be moved forward efficiently and smoothly.

Further, according to the present invention, the bicycle can be moved forward simply by stepping on the left and right pedals alternately within a desired angle range, so even people with disabilities can easily operate the bicycle.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of the bicycle drive mechanism, Fig. 2 is a partially sectional plan view, and Fig. 3 is a sectional view of the intermediate gear section. . In the figure, 1a and 1b are petal levers, 2a and 2b
is a petal gear, 4a, 4b are first bevel gears, 5
a and 5b are petal shafts, 6a and 6b are second bevel gears, 8 is an intermediate shaft, 9a and 9b are intermediate first chain gears, 10 is an intermediate second chain gear, 14 is a drive gear, 15a and 15b are first chain belts, 16 is a second chain belt.

Claims (1)

[Claims for Utility Model Registration] A pair of first bevel gears arranged left and right facing each other are each supported by a petal shaft.
A second bevel gear is engaged between the bevel gears to make the rotation directions of both first bevel gears different, and a petal gear is fixed to each petal shaft extending left and right, and the base end of the petal lever is fixed to the tip of each petal lever. The provided petal is movable up and down in front of the petal shaft, and an intermediate shaft is provided in the left-right direction between the petal shaft and the axle of the rear wheel, and the intermediate shaft is provided with a pair of intermediate first wheels equipped with a freewheel. Attach the chain gear and fix the intermediate second chain gear, and hook the first chain belt between the intermediate first chain gear and the petal gear to make the intermediate first chain gear follow the corresponding petal gear, and attach it to the axle of the rear wheel. The provided drive gear and the intermediate second
A second chain gear is hooked between the chain gear and the intermediate shaft and the intermediate second chain gear are continuously rotated by alternately depressing the left and right pedals, and the rotation of the intermediate second chain gear is transmitted through the second chain belt. A bicycle drive mechanism characterized by transmitting power to a drive gear of a wheel.