JPH02168045A - Rotation drive device - Google Patents

Abstract

PURPOSE:To enable provision of high output torque with high efficiency without needing a high force even during overload running by a method wherein a disc shaft from an input means, a composite gear engaged with the static internal gear of the disc shaft, and a second step gear driven by the composite gear are respectively eccentrically rotated. CONSTITUTION:A rotation input to a crank arm 2 is transmitted from a disc plate 3 and a disc shaft 4 to a gear mounting plate 6, which is eccentrically rotated around a crank shaft 1. Along with rotation of the crank shaft, a support wheel 15 and a composite gear 12 are eccentrically rotated around the shaft 1, and is revolved along a static internal gear 17. In this case, since the gear 12 has an internal gear 14 engaged with the internal gear 17, it is driven at a speed higher than a revolving speed in a reverse direction to an eccentric rotation direction. Rotational movement of the gear 12 is transmitted from the internal gear 13 to a lower stage gear 11 of a second step gear 9. Since the gear 9 is revolved in a reverse direction to its rotation direction along rotation of the mounting plate 6, high-efficient speed increase is effected. Rotation of the gear 11 is transmitted to a gear 10 to rotate an external gear 8, the gear 8 serving as a planetary gear drives an internal gear 19 to transmit its rotation to a chain wheel 21 to drive rear wheels.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is a rotary drive device that increases the rotational force of a rotary drive unit, accelerates it, and extracts it from the output side. , rotating mechanisms such as automobiles, or
This invention relates to a device that can be widely applied as a generator or any other rotating mechanism.

[Conventional technology]

Taking a bicycle as an example, its drive unit consists of a chain wheel, cranks attached to the left and right sides of the chain wheel, and pedals fixed to the crank. By stepping on the pedal, the chain wheel is rotated, and the rotation is transferred to the chain. to the rear wheels. In the case of such a drive mechanism, the rotation of the crank is directly transmitted to the chainwheel via the crankshaft, so in order to give a large rotational force to the chainwheel, a large force must be applied to the pedals, which causes It becomes a burden when driving, driving at high speeds, etc.

The present inventor has already proposed various devices for solving this problem (Japanese Patent Application No. 197938/1984, etc.).

[Problem to be solved by the invention]

However, in the case of the above-mentioned conventional device, sufficient output torque could not be obtained, and the torque generation efficiency could not be said to be good, so it was not necessarily satisfactory.

Therefore, the present invention is capable of efficiently obtaining a large output torque without requiring much force even in the case of overload as described above.
It is an object of the present invention to provide a rotary drive device that enables smooth running, etc., and that can be applied to various rotation mechanisms other than bicycles.

[Means to solve the problem]

The present invention provides an input means supported by a main shaft with an eccentrically rotating disk shaft, and the disk shaft is used to generate a composite gear comprising an internal gear and an external gear, the external gear meshing with a stationary internal gear. a rotating shaft, the composite gear is held by a gear mounting plate fixed to the disk shaft, and a two-stage gear eccentric with respect to the main shaft and an external gear meshing with the upper gear are mounted on the gear mounting plate. The lower gear of the two-stage gear meshes with the internal gear of the composite gear, and the external gear supported on the gear mounting plate is connected to the internal gear supported by the main shaft and provided with an output means on the outside. The above-mentioned problem was solved by using a rotary drive device formed by meshing with each other.

[For production]

When the disk shaft eccentrically rotates due to the rotational input from the input means, the composite gear that meshes with the stationary internal gear is driven to revolve, and rotates accordingly.

The two-stage gear is driven by the rotational motion of this composite gear. The two-stage gear, like the compound gear, rotates eccentrically (revolutions) with respect to the main shaft, but also rotates eccentrically with respect to the main shaft. In this way, the second gear rotates eccentrically, so the speed is increased compared to when it is not eccentric, and the shifting efficiency is improved.The rotation of the second gear is transmitted to the external gear that meshes with it, and the output from the external gear is 1. The rotational driving force is transmitted to the internal gear having stages, and the output means outputs the rotational driving force which is accelerated and powered up.

〔Example〕

An embodiment in which the present invention is applied to a bicycle drive unit will be described with reference to the drawings.In the drawing, 1 is a crankshaft, to one end of which a crank arm 2 and a pedal as an input means are attached by a method. . In other rotary drives,
Instead of the crank arm 2, an input gear, pulley, etc. will be attached. 3 is a disc fixed to the crank arm 2, and a disc shaft 4 having a smaller diameter than the disc 3 is connected to the disc 3.
are integrally installed.

A crankshaft insertion hole is eccentrically provided in the disc 3 and the disc shaft 4, so that the disc 3 and the disc shaft 4 are eccentrically rotated with respect to the crankshaft l. Reference numeral 6 denotes a gear mounting plate, which is fixed to the disc shaft 4 with rivets 7 or the like. The gear attachment Fi6 is also configured to rotate eccentrically with respect to the crankshaft l. Reference numeral 8 denotes an external gear that is pivotally supported on the gear mounting plate 6, and is floated from the gear mounting plate 6 via a collar. 9 is gear mounting plate 6
This is a two-stage gear that is pivotally supported in the upper stage gear lO and the lower stage gear 11. The external gear 8 meshes with the upper gear 10 of the two-stage gear 9. 12 is a small diameter support wheel 1
This is a composite gear fixed to 5, and is equipped with an internal gear 13 with a large pinch between crests on the inside, and an external gear 14 with a small pinch between crests on the outside. The disc shaft 4 is fitted into the center hole 16 of the support wheel 15. Therefore, support wheel 1
5 and the composite gear 12 integrated therewith also rotate eccentrically with respect to the crankshaft l.

However, the support wheel 15 is a circle i! It does not follow the rotation of 1Ir4, but rotates completely separately from that rotation. The lower gear 11 of the two-stage gear 9 meshes with the internal gear 13 of the composite gear 12. The external gear 14 meshes with a stationary internal gear 17 fixed to a vehicle body 18 or the like.

Reference numeral 19 denotes an internal gear having the same diameter as that fixed to the support wheel 20, and the external gear 8 meshes with this. A chain wheel 21 serving as an output gear is fixed to the center of the support wheel 20, and a crankshaft l is inserted therethrough. 22 is a chain.

In the above configuration, the rotational input applied to the crank arm 2 is circular! Gear mounting plate 6 via Fi3 and disc shaft 4
The disc 3, the disc shaft 4, and the gear mounting plate 6 rotate eccentrically around the crankshaft l. Accompanying this eccentric rotation of the disk shaft 4 and the like, the support wheel 15 and the composite gear 12 integrated therewith rotate eccentrically with respect to the crankshaft l and revolve along the stationary internal gear 17. That is, the composite gear I2 rotates eccentrically along the stationary internal gear 17 with which the external gear I4 meshes. At that time, the composite gear 12 is
4 meshes with the stationary internal gear 17 which is fixed and does not rotate, so it is rotated at a higher speed than the revolution speed in the direction opposite to the eccentric rotation direction (rotation). The rotational motion of the composite gear 12 is transmitted from its internal gear 13 to the lower gear 11 of the two-stage gear 9 that meshes with it. Because it revolves in the opposite direction, it accelerates very efficiently. The rotation of the lower gear 11 is directly transmitted to the upper gear 10, and the upper gear 10 rotates the external gear 8 that meshes with it. The external gear 8 is located between the upper gear 10 and the internal gear 19, functions as a planetary gear, and rotates the internal gear 19. The rotation of the internal gear 19 continues as it is to the chain wheel 21.
and the rear wheels are driven via the chain 22.

〔Effect of the invention〕

The present invention is as described above, and since three internal gears are used, it has a compact configuration, and since eccentric rotation is adopted in several stages, the speed can be efficiently increased with a small rotational input. It has the effect of providing rotational driving force, and is very useful as it can be applied to various rotating machines.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an embodiment of the present invention, and FIG. 2 is a partially cutaway view showing its assembled state. Explanation of symbols 1 - crankshaft, 2 - crank arm 3 - disc, 4 - disc shaft 6 - gear mounting plate,
8 - External gear 9 - two-stage gear, 10 - upper stage gear 11 lower stage gear, 12 - compound gear 13. 19 - internal gear,
14-External gear 15.20-Support wheel, I7-
・・Stationary internal gear 21-Chain boiler diagram 2 Patent distributor Parti Sato

Claims (1)

[Claims] (1) An eccentrically rotating disc shaft is attached to the input means supported by the main shaft, and the disc shaft is used to rotate a compound gear comprising an internal gear and an external gear, the external gear meshing with a stationary internal gear. The composite gear is held by a gear mounting plate fixed to the disc shaft, and a two-stage gear eccentric to the main shaft and an external gear meshing with the upper gear are pivotally mounted on the gear mounting plate. , the lower gear of the two-stage gear meshes with the internal gear of the composite gear, and the external gear supported on the gear mounting plate meshes with the internal gear supported by the main shaft and provided with an output means on the outside. A rotary drive device made by