JPH0633236Y2 - Elastic energy storage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention utilizes elastic deformation of a string-like elastic body to store energy, distorts a part of the elastic body by a certain amount, and Regarding the elastic energy storage device that is gradually expanded,
In particular, the present invention relates to an energy storage device capable of automatically adjusting looseness and excessive tension of an elastic body.

[Prior Art] An elastic energy storage device for storing energy by utilizing elastic deformation of an elastic body is disclosed in JP-A-49-96144. The device of the publication has two drums,
It consists of a device in which a string-like elastic body is stretched between two drums, and the two drums rotate in the same direction.

In the energy storage device disclosed in Japanese Patent Laid-Open No. 49-96144, when the initial strain of the elastic body wound around the small diameter drum is 0, the energy at the time of output is 0 and the efficiency is 0.
%. Therefore, when an elastic body having a small elastic elongation is used, a sufficient initial strain cannot be applied, so that there is a problem that the energy at the time of output becomes almost zero.

In order to solve this, although the application has not yet been published, this is a method in which the applicant first distorts a part of the elastic body by a certain amount and gradually expands the region, and at the same time, the elastic body elongation An energy storage device capable of efficiently inputting and outputting energy even when the initial strain when wound around a small-diameter drum in an elastic body having a small size is provided (Japanese Patent Application No. 61-1).
68033).

The elastic energy storage device of Japanese Patent Application No. 61-168033 has, for example, as shown in FIG. 3, an intermediate portion between a first drum 1 having a small outer peripheral rotation amount and a second drum 2 having a large outer peripheral rotation amount. The third drum 3 having the outer peripheral rotation amount is provided, and the string-shaped elastic body 4 is bridged between the drums 1, 2, and 3.

The drums 1, 2, and 3 are connected by a mechanical connecting means 5, for example, a gear so that the outer peripheral rotation amount increases in order from the small diameter drum side to the large diameter drum side, and the string-shaped elastic body 4 is connected to the small diameter drum 1. The elastic body 4 is stretched by the transition winding from the side to the large diameter drum 2 side to store the strain energy thereof, and the strain energy stored in the elastic body 4 is released by the reverse movement.

Such an elastic energy storage device is different from the conventional two-drum system (FIG. 5) in which drums having radii R1, R2, and R3 are connected by gears having the same number of teeth in FIGS. 4 and 5. As shown in comparison with the case of the three-drum system (Fig. 4), by providing the intermediate drum, energy input and output efficiency can be improved, and output can be obtained even when the initial strain of the elastic body is zero. It has become possible.

[Problems to be Solved by the Invention] However, in the elastic energy storage device having the intermediate drum (a plurality of drums may be provided) as shown in FIG. 3, when energy input and output are repeated many times, It turned out that there was such a problem.

That is, after repeating the input and output of energy a number of times, the input and output characteristics may change as shown in FIG. 6 compared to the initial state (the reason will be described later). The figure shows the input and output torque characteristics with respect to the total drum rotation speed.
The left side of the figure shows a state where most of the elastic body is on the minimum diameter drum side before energy input or after energy release, and the right side of the figure is when most of the elastic body is transferred to the maximum diameter drum side during energy storage. It shows the state. In the initial state, the energy input characteristic A and the energy output characteristic B are
After a large number of input and output repetitions, the characteristic A'shown by the broken line
It may change like B '. Such changes are
As will be described later, this is caused by the excess or deficiency of the feeding amount of the elastic body at the time of energy input and output, which causes the elastic body to loosen or be overtightened.

An object of the present invention is to automatically adjust looseness and overtension of an elastic body when an energy storage device having an intermediate drum is repeatedly used to maintain desired input / output characteristics.

[Means for Solving the Problems] The elastic energy storage device of the present invention which achieves this object is
It consists of the following equipment. That is, a plurality of drums that are parallel to each other, a first mechanical connecting unit that connects the plurality of drums in order from the small-diameter drum side to the large-diameter drum side so that the outer peripheral rotation amount increases, and among the plurality of drums An elastic energy storage device comprising: a string-shaped elastic body spanning the outer peripheral surface of the intermediate drum between the outer peripheral surface of the minimum diameter drum and the outer peripheral surface of the maximum diameter drum; A shaft is provided coaxially with a first one-way clutch connected at the time of energy input and a second one-way clutch connected at the time of energy output, and the first mechanical coupling means is connected to the maximum diameter via the first one-way clutch. A second mechanical connection means is provided between the maximum diameter drum and the intermediate drum adjacent to the maximum diameter drum, and the second mechanical connection means is provided with the second mechanical connection means. The drive transmission ratio of the first and second mechanical connecting means is connected to the maximum diameter drum via the clutch,
The rotational speed of the adjacent intermediate drum with respect to the rotational speed of the maximum diameter drum is set to be higher when the energy is output than when the energy is input.

[Operation] In this device, the one-way clutch that operates at the time of energy input and that at the time of energy output are different between the maximum diameter drum and the adjacent intermediate drum, and mechanical coupling means of different systems are mutually configured. Then, the drive transmission ratio (gear ratio) is changed at the time of input and at the time of output so that the rotation speed (rotation speed) of the adjacent intermediate drum with respect to the maximum diameter drum becomes higher at the time of output than at the time of energy input. Is set. As a result, in comparison with the device as shown in FIG. 3, relatively less elastic body is sent to the maximum diameter drum side when energy is input, and more is sent toward the small diameter drum side when energy is output.
The excess or deficiency of the elastic body is corrected, and the elastic body is loosened,
Overtension is prevented.

[Embodiment] Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

1 and 2 show an elastic energy storage device according to an embodiment of the present invention. In the figure, 11 denotes a support, and the support 11 has four axes 12 and 1 parallel to each other.
3, 14, 15 are rotatably supported. A minimum diameter drum 16 is supported on the shaft 12, and a maximum diameter drum 17 is supported on the shaft 15 so as to rotate integrally with the shaft. Intermediate drums 18 and 19 are respectively supported on the shafts 13 and 14 so as to rotate integrally with the shafts.

Gears 20, 21, 22, 23 as a first mechanical connecting means are provided on one end side of each shaft 12, 13, 14, 15 so that the shafts can be sequentially connected to transmit torque. Has been done. In this embodiment, the gears 20, 21, 22, and 23 are configured as gears having the same number of teeth, and the minimum diameter drum 16 to the maximum diameter drum 17
The diameters of the respective drums are sequentially increased in the direction, so that the outer peripheral rotation amount of each drum is sequentially increased when energy is input in this direction. From the drum 16 to the drum 17 via the intermediate drums 18 and 19, a string-like elastic body 24
The elastic body 24 can store strain energy therein by being stretched. Elastic body 24
When energy is accumulated, the portion 30 wound around the outer peripheral surface of the minimum diameter drum 16 is rewound, and the portions 31 and 3 between the drums are rewound.
The elastic body 34 is sequentially stretched at 2, 33, and the stretched elastic body 34 is wound around the outer peripheral surface of the maximum diameter drum 17. At the time of discharging energy, the elastic body 24 is moved in the opposite direction.

The shaft 15 of the maximum diameter drum 17 is coaxial with the first one-way clutch 25 that transmits the driving force when energy is input (in the direction of the arrow in FIG. 2) and when the energy is output (in the direction opposite to the arrow in FIG. 2). Second one-way clutch 26 for transmitting the driving force to
And are provided. The first one-way clutch 25
It is connected to a gear 23 which forms part of the first mechanical connection means.

The second one-way clutch 26 is connected to a gear 27 on the shaft 15, and the gear 27 meshes with a gear 28 fixed to the shaft 14. Therefore, the gear 27 and the gear 28 constitute a mechanical coupling means between the shafts 14 and 15 that is separate from the gears 23 and 22, and the coupling is engaged by the first and second one-way clutches 25 and 26. , Can be switched at output. The gear 27 is configured as a large-diameter gear (large number of teeth) and the gear 28 is configured as a small-diameter gear (small number of teeth), and the rotation speed of the adjacent intermediate drum 19 relative to the rotation speed of the maximum diameter drum 17 is at the time of energy input. The drive transmission ratio is set so that it is larger when the energy is output.

The operation of the embodiment apparatus thus configured will be described.

First, regarding the distortion of the elastic body 24, as shown in FIG. ₂ , the radii of the drums 16, 18, 19, 17 are r ₁ , r ₂ ,
If r ₃ and r ₄ and the radius of the i-th drum are ri: In the case of energy input: Each drum rotates in the direction of the arrow in FIG. 2, and the elastic body 24 is fed from the left to the right in the figure. Assuming that there is no excess or deficiency in the elastic body, the strain η ^input i of the elastic body on the i _- th drum is equal to the strain between the i-th and i ₋₁ th drums η ^input i = ri (1 + η ^input i ₋₁ ) / Ri ₋₁ −1 = ri (1 + η ₁ ) / r ₁ −1.

In case of energy output: Each drum rotates in the direction opposite to the arrow, and the elastic body is sent from right to left. Assuming that there is no excess or deficiency in the elastic body, the strain η ^output i of the elastic body on the i-th drum
Is, i-th and _{i +1} th distortion equal between the drum, the eta ^out i = ri (1 + η ^out _{i +1) / ri +1 -1 =} ri -1 (1 + η 1) / r 1 -1.

As a result, for example, in the intermediate drum 18, when the spring constant of the elastic body is k, at the time of input, the elastic body parts 32, 3 are rotated in the rotational direction.
Tension difference of 1, k [r ₃ (1 + η ₁ ) / r ₁ −1 − {r ₂ (1 + η ₁ ) / r ₁ −1}] = k · (r ₃ −r ₂ ) (1 + η ₁ ) / r ₁ The elastic body is sent from left to right while receiving.

At the time of output, the tension difference between the elastic body portions 32 and 31 in the rotation direction, k [r ₂ (1 + η ₁ ) / r ₁ −1 − {r ₁ (1 + η ₁ ) / r ₁ −1}] = k · (r ₂ While receiving −r ₁ ) (1 + η ₁ ) / r ₁ , unlike the case of input, considering the tension difference,
Send the elastic body from right to left.

Therefore, at the time of input, the tension of the elastic body between the drums increases in order toward the large diameter drum side, and the tension difference of the elastic body between the drums causes each drum to move the elastic body from the minimum diameter drum 16 to the maximum diameter drum 17 In contrast to the direction in which the tension difference between the drums is applied, the direction of action of the tension difference between the drums is opposite to the direction in which the elastic body is fed from the maximum diameter drum 17 to the minimum diameter drum 16, and Hinder the delivery of. Due to this, excess or deficiency occurs in the elastic body 24, and at the time of energy input, the elastic body 24 is sent to the maximum diameter drum 17 side more and is made to drip
At the time of energy output, the elastic body 24 is fed to the minimum diameter drum 16 side by a small amount to make it insufficient.

In order to avoid this phenomenon, the elastic body 24 should apparently be moved more than at the time of energy input at the time of energy output. Specifically, the gear ratio can be changed at the time of input and at the time of output.

At the time of energy input, the one-way clutch 26 is disengaged and the one-way clutch 25 is disengaged, so that each drum is rotated at an equal gear ratio.

At the time of energy output, the one-way clutch 25 is disengaged and the one-way clutch 26 is continued, so that only the maximum diameter drum 17 rotates relatively slowly.

As a result, at the time of output, the elastic body 24 has the smallest diameter drum 16
Is sent more to the side, and the shortage of the elastic body 24 on the minimum diameter drum 16 side is prevented. Further, at the time of input, since less elastic body 24 is sent to the maximum diameter drum 17 side relative to the drive transmission ratio at the time of output, excessive feeding to the maximum diameter drum 17 side is prevented.

Therefore, the predetermined characteristics A and B shown in FIG. 6 are maintained, and the elastic body 24 is prevented from being loosened or overtightened.

[Effect of the Invention] According to the elastic energy storage device of the present invention, the first mechanical connecting means for connecting the minimum diameter drum-the intermediate drum-the maximum diameter drum is provided, and is connected to the shaft of the maximum diameter drum at the time of energy input. The first one-way clutch and the second one-way clutch connected at the time of energy output are provided coaxially, and the first mechanical connecting means is connected to the maximum diameter drum via the first one-way clutch, and the maximum diameter drum and the adjacent thereto. The second mechanical coupling means is provided between the intermediate drum and the intermediate drum, and the second mechanical coupling means is coupled to the maximum diameter drum through the second one-way clutch, and a gear ratio is obtained when the energy is input and when the energy is output. In order to prevent excessive feeding of the elastic body to the maximum diameter drum side at the time of input and to prevent insufficient feeding to the minimum diameter drum side at the time of output, the minimum diameter drum and maximum diameter drum side Even when the elastic body is repeatedly moved between the rams, the elastic body can be prevented from being loosened or overtightened, and the predetermined input / output characteristics can be maintained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic plan view of an energy storage device according to an embodiment of the present invention, FIG. 2 is a side view of each drum and elastic body of the device of FIG. 1, and FIG. A perspective view of an energy storage device proposed in Japanese Patent Application No. 61-168033, FIG. 4 is an energy output efficiency characteristic diagram of the device of FIG. 3, and FIG. 5 is an energy output efficiency characteristic diagram of a two-drum type energy storage device. FIG. 6 is a torque characteristic diagram of the device of FIG. 11 …… Support 12, 13, 14, 15 …… Shaft 16 …… Minimum diameter drum 17 …… Maximum diameter drum 18, 19 …… Intermediate drum 20, 21, 22, 23 …… Gear 24 …… Elastic body 25 , 26 …… One-way clutch 27, 28 …… Gear

Claims (1)

[Scope of utility model registration request] 1. A plurality of drums which are parallel to each other, and a first mechanical connecting means which connects the plurality of drums in order from the small diameter drum side to the large diameter drum side so that the outer peripheral rotation amount increases.
An elastic energy storage device comprising: a string-shaped elastic body bridged over an outer peripheral surface of an intermediate drum between an outer peripheral surface of a minimum diameter drum and an outer peripheral surface of a maximum diameter drum of the plurality of drums. A first one-way clutch connected at the time of energy input and a second one-way clutch connected at the time of energy output are provided coaxially with the shaft of the maximum diameter drum, and the first mechanical coupling means is connected to the first one-way clutch. Through a maximum diameter drum, and further, a second mechanical connection means is provided between the maximum diameter drum and an intermediate drum adjacent thereto, and the second mechanical connection means is connected to the second one-way. It is connected to the maximum diameter drum via a clutch, and the drive transmission ratio of the first and second mechanical connection means is determined by the rotational speed of the adjacent intermediate drum with respect to the rotational speed of the maximum diameter drum. Elastic energy storage device, wherein the person at the time of energy output than during conservation input is set to be large.