JPH0633804B2 - Energy storage device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an energy storage device that stores energy by utilizing elastic deformation of an elastic body, and in particular, a part of the elastic body is largely distorted by a certain amount, and The present invention relates to an energy storage device that sequentially expands a strain region.

[Conventional technology]

An energy storage device that stores energy by utilizing elastic deformation of an elastic body is disclosed in Japanese Patent Laid-Open No. 49-96144. The device of the publication has two drums, and the two drums are covered with an elastic body, and the two drums rotate in the same direction. Although FIG. 4 is not the device disclosed in Japanese Patent Laid-Open No. 49-96144, two drums 10 and 12 having different diameters are juxtaposed in comparison with the present invention having three or more drums described later. However, an energy storage device is shown in which a string-shaped elastic body 14 is struck on it.

[Problems to be solved by the invention]

In the energy storage device shown in Japanese Unexamined Patent Publication No. 49-96144 and the energy storage device having two drums shown in FIG. 4, assuming that the initial strain η of the elastic body wound with the small diameter drum is 0, the output The energy at time becomes 0 and the efficiency becomes 0%. (The reason will be described later.) Therefore, when an elastic body having a small elastic elongation is used, a sufficient initial strain cannot be imparted, so that there is a problem that the energy at the time of output becomes almost zero. .

[Means for solving problems]

The present invention is a method in which a part of an elastic body is largely distorted by a certain amount and its region is sequentially expanded. It is an object of the present invention to provide an energy storage device capable of inputting and outputting.

The energy storage device according to the present invention for achieving this object comprises (a) a first drum and a second drum which are juxtaposed to each other and rotatable about an axis, and a first drum and a second drum. A third drum consisting of an intermediate drum arranged between the drum, (b) a first part wound around the first drum, a second part wound around the second drum, 3 has a third part wound around the drum and a fourth part connecting between the drums, the end of the first part is fixed to the first drum, and the end of the second part. Is the second
(C) the first drum, the second drum, and the third drum, the outer peripheral rotation amount of the second drum being the outer peripheral rotation of the third drum, And a means for connecting the third drum so that the outer peripheral rotation amount of the third drum is larger than the outer peripheral rotation amount of the first drum.

[Action]

In the energy storage device of the present invention, the amount of winding of the first portion of the elastic body around the first drum is reduced and the second portion of the second portion of the elastic body is reduced during energy storage.
The amount of winding around the drum increases. At the time of energy release, the winding amount of the second portion of the elastic body around the second drum decreases and the winding amount of the first portion of the elastic body around the first drum increases. The winding amount around the third drum does not change, and only the winding position moves on the drum according to the accumulation and release of energy.

When the elastic body is wound around the second drum from the first drum through the third drum during energy storage, the outer peripheral rotation amount of the third drum is larger than the outer peripheral rotation amount of the first drum. Yes, since the outer peripheral rotation amount of the second drum is larger than the outer peripheral rotation amount of the third drum, the fourth portion connecting the elastic drums is stretched, and tension is generated in the fourth portion. The energy is accumulated and wound around the third drum in a state where tensile strain is generated. Next, the fourth portion connecting the third drum and the second drum is further stretched, the distortion in this portion increases, and the second portion is wound around the second drum in a state where the energy is increased. Since there is almost no slippage between the elastic body and the first drum, the second drum, and the third drum, the portion that causes tensile strain due to rotation of the drum is almost connected to the elastic drum. After the tensile strain is generated, the state is maintained and is wound around the second drum through the third drum to accumulate energy.

At the time of energy output, an action opposite to that at the time of accumulation occurs, and the elastic body wound around the second drum in the state of large tensile strain causes the second drum and the third drum to rotate when wound around the third drum.
It is wound around the third drum in a state in which the tensile strain is reduced by the amount corresponding to the difference in the outer peripheral rotation amount of the drum. Subsequently, the elastic body exiting the third drum has the tensile strain reduced by an amount corresponding to the difference in the outer peripheral rotation amount between the third drum and the first drum, and has the same magnitude as the initial strain. Is wound up on a drum. Assuming that there is no third drum at this time, the second drum and the first drum
The strain of the elastic body that connects the drums of is equal to the initial strain,
When the initial strain is 0 or close to 0, the energy output is 0 or almost 0. However, since the third drum is between the second drum and the first drum, the strain of the elastic body between the third drum and the second drum is larger than the initial strain, and Energy can be efficiently extracted even when the initial strain of the elastic body is set to 0, that is, even when an elastic body having a small elastic elongation is used.

〔Example〕

Hereinafter, preferred embodiments of an energy storage device according to the present invention will be described with reference to the drawings.

1 and 2 show an embodiment of the present invention, and FIG. 3 shows its characteristics. Energy storage device in the figure
Reference numeral 20 denotes a pair of juxtaposed, rotatable first drums 22 and second drums 24 having different diameters, and two drums between the first drum 22 and the second drum 24. 3rd drum (intermediate drum) with a diameter in between
With 23. The first drum 22 and the second drum 24 have a third
A string-shaped elastic body 25 is spirally wound around the drum 23.

The elastic body 25 has a first portion 25a which is closely attached to the first drum 22 and is wound in a spiral shape, and a second portion 25 which is attached to the second drum 24 and is wound in a spiral shape.
e, a third portion 25c that is wound around the third drum 23 between the first drum 22 and the second drum 24 by one or two turns,
It consists of a fourth part 25b and 25d which is connected between each drum. 1st part 25a, 4th part 25b, and 3rd part
25c, the 4th part 25d, and the 2nd part 25e are connected in series in order, that is, 25a, 25b, 25c, 25d, and 25e. The end 25a 'of the first portion 25a is fixed to the first drum 22, and the end 25e' of the second portion 25e is
It is fixed to the second drum 24.

First drum 22, second drum 24 and third drum 23
Are connected via means 28. The means 28 connects the first drum 22, the third drum 23, and the second drum 24 to the second drum
The outer peripheral rotation amount of the drum 24 (the peripheral movement amount at the time of rotating the drum at an arbitrary point located on the outer periphery is defined as the outer peripheral rotation amount) is larger than the outer peripheral rotation amount of the third drum 23, and The drums 23 are mechanically connected to each other so that the outer peripheral rotation amount of the drum 23 is larger than the outer peripheral rotation amount of the first drum 22. In this case, when the energy is accumulated, the winding amount of the elastic body 25 on the second drum 24 increases, the winding amount of the first drum 22 decreases, and the winding amount of the third drum 23 does not change. Instead, only the winding position of the elastic body 25 changes. When the energy is released, the winding amount of the elastic body 25 on the first drum 22 increases and the winding amount on the second drum 24 decreases.

The above is the main part, and the technical details of the configuration are as follows. First portion 25a of elastic body 25
Is in direct contact with the outer periphery of the first drum 22, and the elastic body 25
The second portion 25e of the first drum 25 is in direct contact with the outer circumference of the second drum 24. The third portion 25c is also in direct contact with the third drum 23. Therefore, the elastic body 25 and the first drum 2
A frictional force that prevents relative displacement in the circumferential direction acts between the second drum 24, the third drum 23, and the fourth portion of the elastic body 25.
Even if elongation occurs in 25b and 25d, the tensile strain is
Of the fourth part 25b, 25
Only d. The winding direction of the first portion 25a of the elastic body 25 around the first drum 22 and the winding direction of the third portion 25c of the elastic body 25 around the third drum 23 are as shown in FIG. 1 and FIG. They are opposite to each other as shown in. Also an elastic body
The winding direction of the third portion 25c of 25 and the second portion of the elastic body 25
The winding direction of the portion 25e of the second portion around the second drum 24 is opposite to each other. Further, the first drum 22, the third drum 23, and the second drum 24 are connected by means 28 so as to rotate in the opposite directions in order in a constant rotation ratio. The fourth portions 25b and 25d of the elastic body 25 pass through the space between the drums.

In FIG. 2, when tension F is applied on the second drum 24 during energy storage, the first drum 22 connected by means 28
And the third drum 23 rotates in the direction of the arrow. At this time,
The radius of the first drum 22 is R1, the radius of the third drum 23 is R2, the radius of the second drum 24 is R3, the number of teeth of each gear of the means 28 is the same, and R1 <R2 <R3. West,
When the outer peripheral rotation amount is increased in the order of the first drum 22, the third drum 23, and the second drum 24, the fourth portion 25b of the elastic body 25
And 25d, the tensile stress increases in accordance with the difference in the amount of rotation of the outer circumference. Assuming that the elastic body 25 is wound around the first drum 22 with the initial strain η, the tensions F1 and F2 of the fourth portions 25b and 25d are the Young's modulus E of the elastic body 25 according to Hooke's law. Then, F1 = {(1 + η) R2
-R1} E / R1, F2 = {(1 + η) R3-R1} E
/ R1. In addition, the balance of forces on the second drum 24 is F = F1 · (R2-R1) / R3 + F2 · (R3
-R2) / R3, the force Fin during energy storage
Is Fin = [{(1 + η) R2-R1} / R1] · E ·
{(R2-R1) / R3} + [{(1 + η) R3-R
1} / R1] · E · {(R3-R2) / R3}.
With this force F, the elastic body 25 sequentially accumulates energy from the first drum 25 to the second drum 24.

Although the number of the intermediate drums 23 is one in the illustrated example, it may be a combination of a plurality of drums arranged side by side.
Further, in the figure, 26 indicates a bearing that rotatably supports the drum, and 27 and 29 indicate support bases that support the drum.

Next, at the time of releasing energy, the action opposite to that at the time of accumulation occurs, and the tensile strain is {(1 + η) R3-R1} / R1 and the elastic body 25 wound around the second drum 24 is
The second drum 24 and the third drum when wound around the drum
In the third drum 23, the tensile strain is reduced by the amount corresponding to the difference in the outer peripheral rotation amount of the drum 23. Subsequently, the elastic body 25 coming out of the third drum 23 has the tensile strain reduced by an amount corresponding to the difference in the outer peripheral rotation amount between the third drum 23 and the first drum 22, and the first drum 22 To be wound up. The respective tensions F1 and F2 of the fourth portions 25b and 25d at this time are F2 = [{(1 + η) R2-R1} / R1] · E F1 = η · E, and the second drum 24 is rotated. The force Fout is Fout = [{(1 + η) R2-R1) / R1] · E · {(R3-R2) / R3} + η · E · {(R2-R1) / R3}. Therefore, the efficiency is Fin / Fout, and the calculation result is shown in FIG.

Further, in the device shown in JP-A-49-96144 and the energy storage device of the comparative example of FIG. 4, the R of FIG.
The balance of forces on 2 is F = F1 {1- (R1 / R
2)} and the magnitude of F1 at the time of input is F1 = E {(1 + η) R2 / R1-1} where Young's modulus is E, where η is the initial strain of the elastic body wound around the small diameter drum. Given in. On the other hand, the magnitude at the time of output is F1 = Eη, and its efficiency is {η (1-R1 / R2)} / [{(1 + η) R2 / R1-1} (1-R1 / R2)]. Therefore, assuming that the initial strain η of the elastic body wound around the small diameter drum is 0, the output is 0 and the efficiency is 0%. The result of this calculation is shown in FIG. As described above, the energy storage device 20 of the present invention has been developed by
Compared with the system shown in Japanese Patent Publication No. 49-96144 and FIG. 4, the efficiency is greatly improved, and high efficiency can be obtained even when the elastic body 25 has a small initial strain.

The above is an example in which the outer peripheral rotation amount of each drum is changed according to the rotation radius of each drum, but the outer peripheral rotation amount of the drum may be changed according to the gear ratio with the same drum diameter, and this selection is arbitrary. Also, by inserting another gear between the gear attached to the first drum and the gear attached to the third drum, the first drum and the third drum
The drums may be rotated in the same direction. As a result, the winding direction of the first portion of the elastic body around the first drum and the winding direction of the third portion of the elastic body around the third drum can be made the same, and the third portion of the third portion can be wound. While maintaining the condition that the outer peripheral rotation amount of the drum is larger than the outer peripheral rotation amount of the first drum, the winding direction of the drum can be arbitrarily set according to the rotation direction of the drum due to the combination of gears.

〔The invention's effect〕

When the energy storage device 20 according to the present invention is used, the following various effects can be obtained.

(A) Compared to the two-drum system as shown in JP-A-49-96144 and FIG. 4 of the comparative example, by providing the intermediate drum 23, even if the initial strain of the elastic body 25 is zero. , Output can be obtained and high efficiency can be expected.

(B) If the number of intermediate drums 23 is increased, the efficiency can be further increased.

(C) Generally, the portions 25b and 25d between the drums of the elastic body 25 are preferably short in view of stability of operation and space.

[Brief description of drawings]

1 is a perspective view of an energy storage device according to an embodiment of the present invention, FIG. 2 is a sectional view of the device of FIG. 1, and FIG.
FIG. 4 and FIG. 4 are characteristic diagrams of the apparatus, and FIG.
-96144 is a cross-sectional view of a comparative example having a two-drum system having the same effect as in Japanese Patent Publication No. 96144, and FIG. 5 is a characteristic diagram of the apparatus of FIG. 20 ...... Energy storage device 22 ...... First drum 23 ...... Third drum (intermediate drum) 24 ...... Second drum 25 ...... Elastic body 25a ...... First part 25b ...... Fourth part 25c ... third part 25d ... fourth part 25e ... second part

Claims (9)

[Claims] 1. A first drum and a second drum, which are juxtaposed with each other, rotatable about an axis, and an intermediate drum arranged between the first drum and the second drum. A third drum; a first portion wound around the first drum, a second portion wound around the second drum, and a third portion wound around the third drum, A first portion for connecting the drums to each other;
The end of the part of is fixed to the first drum,
A string-like elastic body whose end portion is fixed to the second drum; the first drum, the second drum and the third drum, and the outer peripheral rotation amount of the second drum. And a means for connecting the third drum so that the outer peripheral rotation amount of the third drum is larger than the outer peripheral rotation amount of the first drum. 2. The winding direction of the first portion of the elastic body around the first drum and the winding direction of the third portion of the elastic body around the third drum are opposite to each other, The winding direction of the third portion around the third drum and the winding direction of the second portion around the second drum are opposite to each other, and the first drum and the third drum are opposite to each other. The rotation directions of the drums are opposite to each other,
The drum and the second drum rotate in opposite directions,
The energy storage device according to claim 1, wherein the elastic body passes through between the first drum and the third drum and between the third drum and the second drum. 3. The winding direction of the first portion of the elastic body around the first drum is the same as the winding direction of the third portion of the elastic body around the third drum, and 1
Another gear is inserted between the gear attached to the drum of No. 1 and the gear attached to the third drum, and the first drum and the third drum rotate in the same direction, whereby the third portion The outer peripheral rotation amount of the third drum of the first
3 is larger than the outer peripheral rotation amount of the drum, and the winding direction around the drum can be arbitrarily set according to the rotation direction of the drum due to the combination of gears.
Energy storage device according to the item. 4. A means for connecting the first drum, the third drum and the second drum to the first gear and the second drum mounted on the shaft of the first drum. The energy storage device according to claim 1, comprising a second gear attached to the shaft and a third gear attached to the shaft of the third drum. 5. The energy storage device according to claim 1, wherein the connecting means is a chain, a sprocket, or a belt. 6. An outer peripheral rotation amount of the first drum of the first portion is L1, and an outer peripheral rotation amount of the second drum is L2.
When the outer peripheral rotation amount of the third drum is L3, the outer peripheral rotation amount L3 of the third drum is L3 = (L2-L
The energy storage device according to claim 1, wherein 1) / 2 + L1. 7. The energy storage device according to claim 1, wherein the first drum, the third drum and the second drum are straight drums whose radius is constant in the direction along the axis. apparatus. 8. The energy storage device according to claim 1, wherein the energy source for rotating each of the drums is inertial energy of an automobile. 9. The energy storage device according to claim 1, wherein the third drum is a combination of a plurality of drums.