JP2010100269A - Booster - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device including an input part movable within a present use range of a rotation trajectory and capable of producing a high drive force. <P>SOLUTION: A booster includes a sun sprocket 2 fixed to a frame and a rotating arm 3 fixed at its one end to an output shaft 1, and rotatably supporting a planetary sprocket 4 that is engaged to the other end through a chain 13a, an intermediate sprocket 10a, an intermediate gear 11a, an intermediate gear 11b, an intermediate sprocket 10b, and a chain 13b. An input arm 6 is fixed to the other end in a planetary shaft 5 rotating integrally with the planetary sprocket 4. An input shaft 7 is fixed to the tip of the input arm 6. The power applied to the input arm is boosted in an applied direction and output to an output shaft through the rotating arm 3. Further, the power is boosted according to a speed ratio such that the input arm 6 rotates twice while the rotating arm 3 rotates once, and the boosted power is output. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a device that converts a small force into a larger force, and more particularly to a booster that is suitable for a device that uses human power as a driving force source, such as a bicycle or a wheelchair.

For example, in the case of a bicycle drive mechanism, a drive shaft is attached to the other end of an arm having a pedal at one end so that the drive shaft can be integrally rotated, and by stepping on the pedal, a sprocket provided concentrically on the drive shaft is driven to rotate The rear wheel is configured to be driven through the chain.

In such a mechanism, the force applied to the pedal is only boosted by the length of the pedal arm and the radius of the sprocket, and there is a limit to increasing the length of the pedal arm, which is not necessarily satisfactory. Not. In particular, when driving force is applied by hand, such as a wheelchair, the range in which the force can be easily applied is limited, and depending on the physical conditions of the user, It is easy to be restricted by the movement range and driving direction.

A first object of the present invention is to disclose a booster device in which the movement of an input unit falls within a rotation locus within a currently used range and is output as a large driving force.

A second object of the present invention is to disclose a booster that is easy to apply a force by a hand or a foot and that generates a large force.

A third object of the present invention is to disclose a human-powered drive device that is easy to drive even for people with insufficient physical conditions and that is less fatigued even if driven for a long time.

The first gist of the present invention is a solar transmission member (2) having a circumferential power transmission portion fixed to a frame and an output that penetrates the solar transmission member (2) in a concentric manner. A planetary transmission member (4) fixed to one end of the shaft (1) and the output shaft (1) and engaged to the other end via the solar transmission member (2) and the power transmission member (10ab, 11ab, 13ab). An input arm (6) is fixed to the other end of the planetary shaft (5) that rotates together with the planetary transmission member (4). ) Is attached to the tip of the input shaft (7).

In the above description, the circumferentially shaped power transmission unit means, for example, a circular gear tooth, a pulley circumferential groove, a sprocket tooth, and the like. Therefore, the solar transmission member provided with such a power transmission unit is, for example, a gear fixed to the frame side, a timing belt wheel, or a sprocket. The planetary transmission member that engages with the solar transmission member is a gear, a timing belt wheel, or a sprocket according to the type of the solar transmission member, and these are powers of an intermediate gear, an intermediate sprocket, a timing belt, a chain, or the like. It is engaged via the transmission member.

In the booster according to the first aspect, first, the solar transmission member and the planetary transmission member are located at both ends of the rotary arm, and are engaged via the power transmission member. The solar transmission member is used as a sun gear, and the planetary transmission member is used. When the planetary gear is used, the planetary shaft is rotatably supported at the other end of the rotating arm fixed to one end of the drive shaft that is concentrically and rotatably penetrates the sun gear fixed to the frame. It is assumed that the planetary gear fixed to one end of the planetary shaft meshes with the sun gear fixed directly. As a result, the planetary gear rotates around the fixed sun gear while rotating with the rotating arm. At this time, if the number of teeth of the sun gear and the number of teeth of the planetary gear are the same, the planetary gear rotates twice while making one revolution around the sun gear.

Although it is an apparatus interlock | cooperated by the above principle, in order to set this rotating arm longer, the sun gear and the planetary gear are first replaced with sprockets. An intermediate gear is fixed to one end of each of the two intermediate shafts that are rotatably supported at the center of the rotating arm at right angles to the arm, and meshed with each other. Intermediate sprockets are fixed to the other ends of the two intermediate shafts, one connected to the solar sprocket and the other to the planetary sprocket. Here, the number of teeth of the solar sprocket and the planetary sprocket is the same, the number of teeth of the two intermediate sprockets is the same, and the number of teeth of the two intermediate gears is the same. As a result, the planetary sprocket is rotated twice while making a round around the solar sprocket by the rotating arm, and the rotating direction of the planetary sprocket and the rotating arm is the same.

  The maximum output is when the input arm that rotates integrally with the planetary transmission member is parallel to the rotary arm, and the input shaft fixed to the tip of the input arm is located on the outermost side. Minimum output. Accordingly, the force applied to the input shaft at the maximum output position is applied to the planetary transmission member rotating integrally with the input arm and engaged with the solar transmission member via the power transmission member, but the solar transmission member is fixed. Therefore, the planetary transmission member tries to revolve while rotating around the solar transmission member together with the rotating arm. In addition to this, the planetary transmission member makes a round around the solar transmission member, and a speed ratio of two rotations is added to produce a large output. Also, if the length of the input arm is increased depending on the product, a larger booster can be obtained.

As is clear from FIG. 3, the locus of the input unit (7) is the same as the locus having the radius of the total length of the petal arm by the bicycle. Moreover, an extremely high boosting effect is obtained at the position (A) as shown in FIG. 3 by the power transmission ratio or the like in which the planetary sprocket 4 rotates twice while the rotating arm 3 makes one round. In bicycles, etc., if this booster is attached so that the directions of the rotating arms are opposite to each other, the bicycle inputs with the stepping force downward by the left and right soles, so the part with the greatest boost effect It becomes possible to travel using only Further, if necessary, if a one-way clutch (one-way clutch) or the like is interposed between the drive sprocket 80 or the rotary arm 3 and the drive shaft 1, only the portion having a large boosting effect can be used in a reciprocating manner. The device of the present application has a high boosting effect on the input, and can further keep the locus of the input part in a small range. Combined with the boosting effect, the device can be used for a user-powered vehicle such as a wheelchair or a bicycle. It is less expensive and more effective.

FIG. 1 shows an embodiment in which a pair of boosters of the present application is used in a bicycle. In FIG. 1, a drive sprocket 80 is sandwiched so as to balance with the half mechanism shown in FIG. Illustration of a booster having the same configuration to be provided at a symmetrical position opposite to the solar sprocket 2 is omitted. A drive sprocket 80 is fixed to the rotary drive shaft 1 forming the output shaft so as to rotate integrally. The drive shaft 1 is horizontally supported rotatably by a drive bearing 81 provided on the bicycle body frame side 82. The drive sprocket 80 is connected to a sprocket on the rear wheel side of the bicycle via a chain (not shown).

A solar sprocket 2 as a solar transmission member is fixed to the end face of the vehicle body frame 82 supporting the drive bearing 81 concentrically with the drive shaft 1. On the other hand, the rotating arm 3 is fixed to the projecting portion 1a of the drive shaft 1 at its base end 3a so as to be integrally rotatable in a direction orthogonal to the drive shaft 1, and in the vicinity of the distal end 3b of the elongated rotating arm 3, A planetary shaft 5 is rotatably supported via planetary bearings 8a and 8b in a direction orthogonal to the rotary arm 3.

A planetary sprocket 4 as a planetary transmission member is fixed to the projecting end 5 a of the planetary shaft 5 and connected to the solar sprocket 2. The input arm 6 is fixed to the opposite projecting end 5b in a direction orthogonal to the planetary axis 5, and the input shaft 7 is attached to the tip of the input arm 6 in the direction orthogonal to the input arm 6 in the direction opposite to the planetary axis 5. It is stuck. That is, the planetary shaft 5, the input arm 6, and the input shaft 7 are the same as a crank-shaped integral part.

In order to connect the solar sprocket 2 and the planetary sprocket 4, two intermediate shafts 9 a and 9 b are rotatably supported by ball bearings 12 a and 12 b in the direction perpendicular to the rotating arm 3 at the center of the rotating arm 3. ing. An intermediate sprocket 10a is fixed to the projecting portion of the intermediate shaft 9a, and is connected to the solar sprocket 2 by a chain 13a. An intermediate sprocket 10b is fixed to the protruding portion of the intermediate shaft 9b, and is connected to the planetary sprocket 4 by a chain 13b. The intermediate gear 11a and the intermediate gear 11b rotate integrally with the intermediate shaft and mesh with each other at the protruding portions opposite to the intermediate shafts 9a and 9b. Thus, the solar sprocket 2 and the planetary sprocket 4 are connected. If this is replaced with a planetary gear instead of the planetary sprocket 4, the planetary sprocket 4 is engaged with the sun gear via intermediate gears rotatably supported by a plurality of gear shafts projecting on the sun gear side of the rotary arm 3. May be good.

3, the force applied by the petal 14 to rotate the input arm 6 in the counterclockwise direction acts as a force for rotating the planetary sprocket 4. By the way, in the said embodiment, the booster illustrated has the ratio of the number of teeth of the solar sprocket 2 and the planetary sprocket 4 to 1: 1, and the ratio of the number of teeth of the intermediate sprocket 10a and the intermediate sprocket 10b is 1: 1. The ratio of the number of teeth of the intermediate gear 11a and the intermediate gear 11b is set to 1: 1.

When the planetary sprocket 4 rotates, it is connected to the solar sprocket 2 fixed via the chain 13b → the intermediate sprocket 10b → the intermediate gear 11b → the intermediate gear 11a → the intermediate sprocket 10a → the chain 13a. As a result, the planetary sprocket 4 rotates twice around the solar sprocket together with the rotating arm 3 while making one turn counterclockwise. The maximum input is applied to the drive shaft 1 at the position (a). In the opposite position (180 °), the input is the minimum. When the rotating arm 3 makes one rotation (360 °), the input arm 6 also returns to the position (A).

It is sectional explanatory drawing which shows one Embodiment of this-application apparatus. It is explanatory drawing which looked at the apparatus of FIG. 1 from the side. It is explanatory drawing which shows the locus | trajectory of the input part of the apparatus of FIG.

Explanation of symbols

1 Rotation drive shaft (output shaft)
2 Solar sprocket 3 Rotating arm 4 Planetary sprocket 5 Planetary shaft 6 Input arm 7 Input shaft 8 Planetary bearing 9 Intermediate shaft 10 Intermediate sprocket 11 Intermediate gear 12 Intermediate bearing 13 Chain 14 Petal 80 Bicycle drive sprocket 81 Drive bearing 82 Body frame

Claims (2)

A solar transmission member having a circumferential power transmission portion fixed to the frame, an output shaft that passes through the solar transmission member in a concentric manner, and is fixed to the output shaft at one end and attached to the other end. A rotating arm that rotatably supports the planetary transmission member engaged with the solar transmission member via the power transmission member, and an input arm is fixed to the other end of the planetary shaft that rotates integrally with the planetary transmission member. A booster characterized in that an input shaft is fixed to the tip of the input arm. The planetary transmission member engaged with the solar transmission member via the power transmission member rotates twice while making a round around the solar transmission member, and the planetary transmission member and the rotary arm are also in the same direction. The booster according to claim 1.

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