JP2024029721A - Swinging rotation transmission assemblage for bicycle - Google Patents

Abstract

To provide a swinging rotation transmission assemblage for bicycles having a simple structure and a small number of components, low in cost and capable of diminishing a bend of a knee to such an extent that a load on a leg which depresses a pedal is alleviated.SOLUTION: The length of coupling rods 6a and 6b which rotate cranks 4a and 4b of a swinging rotation transmission assemblage for bicycles which is mounted on a bicycle is larger than the length of the cranks 4a and 4b. Therefore, a distance at which the coupling rod 6a is instantaneously swung and moved forward together with the pedal 7a to such an extent that the coupling rod 6a on the side on which the pedal 7a is not depressed can rotate the crank 4a from an apex gets longer, so that while the pedal 7a is depressed with the coupling rod being swung and moved to be on the side on which the pedal 7a is depressed, a bend of a knee can be diminished to such an extent that a load on the leg which depresses the pedal 7a is alleviated. The pedal 7b on the opposite right side can be depressed in the same manner.SELECTED DRAWING: Figure 1

Description

The present invention relates to a swinging rotation transmission device for a bicycle that can reduce the bending of the knees to the point where the burden on the legs pedaling the bicycle is reduced.

Conventionally, when riding a typical bicycle, when you sit on the saddle, hold the handlebars, and put effort into your legs to pedal, when the crank reaches its lowest point, the crank stops. Since there is a certain distance from the pedal attached to the tip of the pedal to the ground, the knee of the pedaling leg is bent deeply and greatly from the moment the pedal is started, so the burden on the pedaling leg is reduced. Since the force increases much more than the force required to pedal, the power to produce the original force becomes weaker, and even if you are able to produce the original force to pedal by the time you finish pedaling, the distance you are pedaling will be longer. Because of this, it was not possible to pedal in a way that would reduce the burden on the pedaling legs. Therefore, if you install a transmission gear that changes the load on the pedaling leg and use a larger gear, you can reduce the burden on the pedaling leg, but if you go uphill in this condition, the weight of pedaling will be reduced. The transmission gears alone could not alleviate the burden on the legs of pedaling any further.

Therefore, as a well-known technology that eliminates this inconvenience, a "drive assist device" that can effectively reduce the burden on the legs pedaling while riding a bicycle and provide sufficient drive assistance (see Patent Document 1) can be mentioned.

Patent No. 6347020

The drive assist device according to Patent Document 1 mentioned above is implemented on a bicycle. One form of this is that when riding a bicycle by pedaling a variable mechanism that allows the distance between the support shaft and the pedals to be changed, the entire variable mechanism that functions as a variable mechanism is rotated, and the guide member The rollers of the variable mechanism, which are fitted in the annular guide groove of the distorted annular shape, move within the groove, so that the other end of the plate-like piece of the variable mechanism is attached to the fixed support shaft. The distance between the shaft center and the pedal shaft center is designed to be longer on the blunt end side where the pedal is swollen, and shorter on the sharp end side where the pedal is depressed, so that the standard crank length can be adjusted at the blunt end side where the pedal is pedaled. In the longer section, the speed at which the rollers of the variable mechanism move within the groove becomes faster, and the speed at which the pedals of the variable mechanism are pedaled also becomes faster, effectively reducing the burden on the pedaling leg and providing sufficient drive assistance. I can do it.

However, according to this technique, since complicated movements are performed while pedaling, the number of parts increases, resulting in an unavoidable increase in costs.

The present invention was made to solve these problems, and its technical problems are that it has a simple structure, a small number of parts, and low cost, and that when riding a bicycle, it can be used while sitting on the saddle. To provide a rocking rotation transmission device for a bicycle, which can reduce the bending of the knee to the point where the burden on the pedaling leg is reduced while the pedaling leg is putting effort into the pedaling leg while gripping the handlebar. It's about doing.

In order to solve the above technical problem, one form of the present invention includes a crankshaft rotatably attached to a first bearing on the upper side of a bicycle frame, and a crankshaft attached at both ends of the crankshaft through 180 degrees. a crank mounted and fixed with a phase difference of A pedal attached to the tip of the connecting rod is used to swing the connecting rod back and forth, and the connecting rod is instantly rocked forward together with the pedal to the point where the crank can be rotated, and then A bicycle comprising: a transmission mechanism for rotating the crank while rocking and moving the crank, and for rotating the crankshaft and transmitting the rotation of the crankshaft to a transmission gear of a transmitted part. This is an oscillating rotation transmission device for use.

According to the present invention, with the above configuration, the structure is simple, the number of parts is small, and the cost is low. While rowing, the length of the connecting rod that rotates the crank is longer than the length of the crank, so the distance that the connecting rod instantaneously swings forward with the pedals becomes longer, so the leg that pedals It is possible to provide a bicycle rocking rotation transmission device that can reduce the bending of the knee to the extent that the burden on the bicycle is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an example in which the bicycle rocking rotation transmission device of the present invention is implemented on a bicycle. FIG. 2 is a simplified diagram showing the operation of the bicycle rocking rotation transmission device shown in FIG. 1 until the side on which the pedals are not pedaled is switched to the side on which the pedals are pedaled. FIG. 3 is a simplified diagram showing how the pedals are pedaled after performing the actions shown in FIG. 2.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the bicycle rocking rotation transmission device of the present invention is applied to a bicycle will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing an example in which the bicycle swing rotation transmission device of the present invention is implemented on a bicycle.

Referring to FIG. 1, the bicycle swing rotation transmission device includes a crankshaft 3 rotatably attached to a first bearing 2 on the upper side of a bicycle frame 1, and a crankshaft 3 rotatably attached to a first bearing 2 on the upper side of a bicycle frame 1. , cranks 4a and 4b that are fixed and fixed with a phase difference of 180 degrees, spindles 5a and 5b that are attached to the tips of the cranks 4a and 4b, and spindles 5a and 5b that are rotatably attached to the spindles 5a and 5b so that they always hang. connecting rods 6a, 6b, which are in a state where the connecting rods are closed; pedals 7a, 7b attached to the tips of the connecting rods 6a, 6b for freely swinging the connecting rods 6a, 6b back and forth; 6a, 6b together with the pedals 7a, 7b are instantaneously swung forward to a point where the cranks 4a, 4b can be rotated, and then the cranks 4a, 4b are rotated while continuing to oscillate. , a transmission mechanism for rotating the crankshaft 3 and transmitting the rotation of the crankshaft 3 to a transmission gear 14 as a transmission target part. .

The transmission mechanism also includes a first gear 8 fixedly attached to the inside of the left end of the crankshaft 3, and a second gear 8 rotatably attached to a second bearing 9 on the lower side of the frame 1 of the bicycle. A shaft 10, a second gear 11 attached and fixed to the left end of the rotating shaft 10, a first chain 12 spanning the first gear 8 and the second gear 11, and the rotating shaft 10, the transmission gear 14 of the transmitted portion, and a second chain 15 spanning the oval chainring 13 and the transmission gear 14. It is characterized by:

In this way, the transmission mechanism that transmits the rotation to the next one can be created by sitting on the bicycle saddle 16, gripping the handlebars, applying force to the legs pedaling the pedals 7a and 7b, and starting to pedal the pedals 7a and 7b. 6b rotates the cranks 4a and 4b, and both the crankshaft 3 and the first gear 8 rotate. Since the first chain 12 is spanned between the first gear 8 and the second gear 11, the rotating shaft 10 and the second gear 11 are both rotated as the first chain 12 rotates. Make a rotation. When the second gear 11 rotates, the oval chain ring 13 also rotates together with the rotating shaft 10. Since the second chain 15 is spanned between this oval chain ring 13 and the transmission gear 14 attached to the right side of the rear wheel, as the second chain 15 rotates, the transmission gear 14 The bicycle travels by rotating both the front and rear wheels.

FIG. 2 is a simplified diagram showing the operation of the bicycle rocking rotation transmission device shown in FIG. 1 until the side on which the pedal 7a is not pedaled is switched to the side on which the pedal 7a is pedaled.

Referring to FIG. 2, the connecting rod 6a, which is hanging at the position G on the side where the pedal 7a is not pressed, has no resistance to rotate the crank 4a until it reaches the forward position, so the crank 4a cannot be rotated during this time. As the pedal 4a rotates from the position G to the apex position A on the pedal 7a side, the connecting rod 6a is instantaneously swung forward together with the pedal 7a. For this reason, the distance that the crank 4a is oscillated is due to the length of the connecting rods 6a, 6b that rotate the cranks 4a, 4b being longer than the length of the cranks 4a, 4b, as shown in FIG. From position G to the apex of position A, including the rotation distance rotated by the side pedaling the pedal 7b, the distance of oscillating movement is longer, so at the position (A) where the pedal is switched to the side pedaling the pedal 7a, Even if the connecting rod 6a that rotates the crank 4a is momentarily swung forward together with the pedal 7a, the bending of the knee of the leg that pedals the pedal 7a is only slightly reduced, but the bending is instantaneously swung forward to the point where the original force can be exerted. Because of the movement, the bending of the knee is reduced to the point where the strain on the leg pedaling the pedal 7a is reduced in position (A), and the pedal 7a can be pedaled diagonally forward and downward with force, and the connecting rod 6a is connected to the crank 4a. can be rotated from the position A vertex.

FIG. 3 is a simplified diagram showing the pedal 7a being pedaled after performing the operation shown in FIG.

Referring to FIG. 3, after performing the operation shown in FIG. 2, the pedal 7a is switched to the pedal 7a side, and in the first half of the operation from the apex of position A to position C90 degrees, the pedal 7a is moved forward from position (A). While pedaling forcefully diagonally downward, when the connecting rod 6a rotates the crank 4a from the apex of position A to position B, the knee bends from position A until the strain on the leg pedaling the pedals 7a is reduced. While pedaling the pedal 7a diagonally forward and downward, the connecting rod 6a rotates the crank 4a from position B to position C by 90 degrees, and the knee of the leg pedaling the pedal 7a bends to the position B. At the same time, the burden on the leg for pedaling the pedal 7a is also reduced compared to the position B. Then, in the second half of the operation from position C90 degrees to the lowest point of position E, the distance at which the pedal 7a leaves the crankshaft 3 at position C90 degrees has become almost the longest, so as it is, position E Up to the lowest point, the difference in distance between the pedals 7a and the crankshaft 3 is minimized, so the distance traveled by the pedals 7a is longer than in the first half. Therefore, from position B to the lowest point of position E, the knee of the leg pedaling the pedal 7a is in a straight state, so during this period, the leg above the knee of the leg pedaling the pedal 7a is pushing the leg below the knee. At the same time, the connecting rod 6a rotates the crank 4a while the pedal 7a is forcefully pedaled backward and diagonally downward, and the burden on the leg pedaling the pedal 7a is reduced compared to the position C90 degrees.

Furthermore, if the connecting rod 6a and the pedal 7a are instantaneously swung forward together with the pedal 7a so as to push the pedal 7a forward and upward, the distance swung will be longer than the distance swung to the top position. From this state, if you forcefully pedal the pedal 7a forward and diagonally downward, the bend of the knee of the leg pedaling the pedal 7a will be reduced until the leg above the knee of the leg pedaling the pedal 7a can push the leg below the knee. It becomes possible to lengthen the distance in which the pedal 7a can be pedaled while pressing the pedal 7a until the pedal 7a is finished, and during this time, the burden on the legs that is relieved from the start of pedaling the pedal 7a is further reduced until the pedal 7a is finished pedaling. I can do it.

The position of the saddle 16 is such that when a person is seated on the saddle 16, the connecting rod 6a is instantaneously swung forward together with the pedals 7a by a long distance, and the pedals 7a are moved forward and diagonally downward. It is characterized in that the saddle is installed behind the standard saddle position to the point where the rider can row powerfully.

Then, while sitting on the saddle 16, from the position (A) where the movement shown in Figure 3 is being performed, forcefully pedal the pedals 7a forward and diagonally downward until a little further, and then at the bottom when the pedals 7a are finished. Before and after the point, by using the oval chain ring 13, the speed of pedaling the pedal 7a becomes a little faster and the burden of pedaling the pedal 7a becomes a little lighter, so while pedaling the pedal 7a, the burden on the leg pedaling the pedal 7a is reduced. can all be reduced.

That is, the bending of the knee of the leg that pedals the pedal 7a is made smaller from the time the pedal 7a is started until the pedal 7a is finished, and the strain on the leg that is reduced from the start of the pedal 7a is reduced until the pedal 7a is finished. It is possible to pedal 7a in a decreasing manner. The pedal 7b can be pedaled on the opposite right side in the same way.

1 Bicycle frame 2 First bearing shaft 3 Crank shaft 4a, 4b Crank 5a, 5b Support shaft 6a, 6b Connecting rod 7a, 7b Pedal 8 First gear 9 Second bearing 10 Rotating shaft 11 Second gear 12 First chain 13 Oval chain ring 14 Transmission gear 15 Second chain 16 Saddle 17 Handle

Claims (5)

A crankshaft rotatably attached to a first bearing on the upper side of the bicycle frame, a crank attached and fixed to both ends of the crankshaft with a phase difference of 180 degrees, and attached to the tip of the crank. a connecting rod that is rotatably attached to the supporting shaft so that it always hangs, and a connecting rod that is attached to the tip of the connecting rod for freely swinging the connecting rod back and forth. The pedal and the connecting rod are instantly rocked forward together with the pedal to the point where the crank can be rotated, and then the crank is rotated while continuing the rocking movement, and the crankshaft is also rotated. and a transmission mechanism for transmitting the rotation of the crankshaft to a transmission gear of a transmitted portion. 2. The rocking rotation transmission device for a bicycle according to claim 1, wherein the connecting rod is instantaneously rocked forward together with the pedal for a long distance, and the pedal is pedaled from an early stage after the pedal is started. The bending of the knee of the leg pedaling is reduced to the point where the leg above the knee can push the leg below the knee, increasing the distance the pedal can be pedaled and reducing the strain on the pedal. A rocking rotation transmission device for a bicycle, characterized in that the length of the connecting rod is longer than the length of the crank in order to further reduce the burden on the legs. 2. The bicycle rocking rotation transmission device according to claim 1, wherein the transmission mechanism includes a first gear mounted and fixed inside the left end of the crankshaft, and a second bearing located on the lower side of the bicycle frame. a rotating shaft rotatably attached, a second gear fixedly attached to the left end of the rotating shaft, and a first chain spanning the first gear and the second gear; An oval chain ring attached and fixed to the right end of the rotating shaft, the transmission gear of the transmitted portion, and a second chain spanning the oval chain ring and the transmission gear. An oscillating rotation transmission device for bicycles, which is characterized by: The position of the saddle is determined by sitting on the saddle and moving the connecting rod, along with the pedals, forward by a long distance, until the pedals can be forcefully pedaled diagonally downward. A rocking rotation transmission device for a bicycle, characterized in that the saddle is installed behind the position of the saddle. 4. The oscillating rotation transmission device for a bicycle according to claim 3, wherein, while seated on the saddle, forcefully pedal the pedals forward and diagonally downward until a little further, and before and after finishing pedaling the pedals. A rocking rotation transmission device for a bicycle characterized by using an oval chain ring to reduce the burden of pedaling.

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