JPH0356681Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an energy storage device that stores energy by utilizing the elastic deformation of an elastic body. The present invention relates to an energy storage device that gradually expands its strain region.

[Prior Art] An energy storage device that stores energy using elastic deformation of an elastic body is disclosed in Japanese Patent Laid-Open No. 49-96144. The device disclosed in this publication has two drums and an elastic body is stretched around the two drums, so that the two drums rotate in the same direction.

In the energy storage device shown in the above-mentioned Japanese Patent Application Publication No. 49-96144, if the initial strain η 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 with low elastic elongation is used, there is a problem in that sufficient initial strain cannot be imparted, so that the energy at the time of output becomes almost zero.

Therefore, in order to solve these problems, we developed a method in which a part of the elastic body is distorted by a large fixed amount and the area is gradually expanded. An energy storage device has been proposed that can efficiently input and output energy even under conditions of
61-168033).

In this energy storage device, an intermediate drum is disposed between the first drum and the second drum, and by once wrapping an elastic material around the intermediate drum, the intermediate drum and the second drum are connected. The strain of the elastic body between the drum and the drum can be made larger than the initial strain, and even if the initial strain of the elastic body is 0, energy can be extracted efficiently.

[Problems to be Solved by the Invention] In the energy storage device disclosed in Japanese Patent Application No. 61-168033 mentioned above, the rotation of each drum is reversed when energy is input and when energy is output. When this energy storage device is used in a vehicle or the like, a reversing device is required because during energy regeneration, the input and output shafts are required to rotate in the same direction as when energy is input. Conventionally, this reversing device has been installed outside the energy storage device, requiring a large amount of space.
Energy storage devices, especially when mounted on vehicles, must be made as compact as possible, and the addition of a reversing device makes this difficult to achieve.

Here, if a reversing device is built into the energy device and a means for connecting the drums used in the energy device is used in the reversing device, the entire energy storage device including the reversing device can be made more compact. .

Focusing on the above points, the present invention significantly simplifies the configuration of the energy storage device including the reversing device and makes it more compact by effectively utilizing the means for connecting each drum used in the energy storage device. The purpose is to measure.

[Means for Solving the Problems] The energy storage device of the present invention that meets this purpose includes (a) a first drum, a second drum, and a second drum, which are juxtaposed to each other and are rotatable about their axes. 1
a third drum consisting of an intermediate drum disposed between the drum and the second drum; (b) a first portion wrapped around the first drum and a third drum wrapped around the second drum; It has a second part, a third part wound around the third drum, and a fourth part connecting each drum, the end of the first part being fixed to the first drum, (c) a string-like elastic body with an end of the second portion fixed to the second drum; (c) the first drum, the second drum and the third drum;
means for connecting the third drum so that the outer circumferential rotation amount of the drum is larger than the outer circumferential rotation amount of the third drum, and the outer circumferential rotation amount of the third drum is larger than the outer circumferential rotation amount of the first drum. an energy storage device comprising: a connecting gear attached to each drum; a first gear juxtaposed to the connecting gear of the drum; An input/output shaft for inputting/outputting energy is provided near the first gear, and is supported by the input/output shaft so as to be movable in the axial direction of the input/output shaft and engageable in the rotational direction. a second gear is fitted, and the second gear is connected to the first gear;
The drum can be selectively engaged with either one of the connecting gears of the drum adjacent to the drum to which the gear is attached.

[Function] In the energy storage device configured as described above, when energy is stored, the amount of winding of the first portion of the elastic body around the first drum decreases, and the amount of winding of the second portion of the elastic body around the second drum decreases. The amount of wrapping around increases. At the time of energy release, the amount of wrapping of the second portion of the elastic body around the second drum decreases, and the amount of wrapping of the first portion of the elastic body around the first drum increases. The amount of winding on the third drum does not change, and only the winding position moves on the drum in accordance with the accumulation and release of energy.

During energy storage, when the elastic body is wound around the second drum from the first drum through the third drum, the amount of rotation of the outer circumference of the third drum is greater than the amount of rotation of the outer circumference of the first drum. Since the amount of rotation of the outer circumference of the second drum is greater than the amount of rotation of the third drum, the fourth portion of the elastic body connecting the drums is stretched, and tension is generated in this fourth portion. Energy is accumulated and the wire is wound around the third drum with tensile strain. Next, the fourth portion connecting the third drum and the second drum is further stretched, the strain in this portion increases, and the fourth portion is wound around the second drum with increased energy.

During energy regeneration, an action opposite to that during storage occurs, and when the elastic body wrapped around the second drum in a state of large tensile strain is wound around the third drum, the outer circumferences of the second and third drums rotate. It is wound around the third drum with the tensile strain reduced by an amount corresponding to the difference in amount. Subsequently, the tensile strain of the elastic body that leaves the third drum decreases by an amount corresponding to the difference in the outer peripheral rotation amount of the first drum and the third drum, and becomes the same size as the initial strain. It is wound up on drum 1.

In this case, when energy is input, the second
For example, the gears directly mesh with the connecting gears of arbitrary drums, and each drum is rotated in a predetermined direction via the connecting gears. When regenerating energy, the second
A gear moves on the input/output shaft and meshes with a first gear attached to any of the above-mentioned drums and an adjacent drum. That is, during energy regeneration, the input/output shaft is rotationally driven by the rotation of the adjacent drum, so the rotational direction of the input/output shaft during energy regeneration is the same as that when energy is input.

In this way, in the present invention, the connecting gear connecting each drum and the input/output shaft itself are used as the reversing mechanism, so the entire energy storage device can be made much more compact than when a reversing device is provided separately.

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

1 to 4 show an energy storage device according to an embodiment of the present invention. In the figure, the energy storage device 20 includes a first drum 22 and a second drum 24 which are arranged in parallel and are rotatable about their respective axes and have different diameters, and a first drum 22 and a second drum 24 that are rotatable about their respective axes. 24 has a third drum (intermediate drum) 23 having a diameter intermediate between the diameters of the two drums. A string-like elastic body 25 is spirally wound around the first drum 22 and the second drum 24 via the third drum 23.

The elastic body 25 has a first portion 25a that is wound in a spiral shape in close contact with the first drum 22.
and a second portion 25e that is attached to the second drum 24 and wound in a spiral shape, and a second portion 25e that is wound around the third drum 23 between the first drum 22 and the second drum 24 once or twice. third part 25
c, and fourth portions 25b and 25d that connect between each drum. The first part 25a, the fourth part 25b, the third part 25c, the fourth part 25d, and the second part 25e are connected in series in the order of 25a, 25b, 25c, 25d, and 25e. continuous in shape. An end 25a' of the first part 25a is fixed to the first drum 22, and an end 25e' of the second part 25e is fixed to the second drum 24.

The first drum 22, the second drum 24 and the third drum
The drum 23 is connected to connecting gears 28a, 28b, 28
They are connected via means 28 consisting of c. The means 28 includes a first drum 22 and a third drum 23.
and the second drum 24, the outer circumferential rotation amount of the second drum 24 (the circumferential movement distance of an arbitrary point located on the outer circumference when the drum rotates is defined as the outer circumferential rotation amount) is the same as that of the third drum 23. They are mechanically connected to each other so that the amount of rotation of the outer periphery of the third drum 23 is greater than the amount of rotation of the outer periphery of the first drum 22 . In this case, in the energy storage device, the amount of wrapping of the elastic body 25 on the second drum 24 increases, the amount of wrapping on the first drum 22 decreases, and the amount of wrapping of the elastic body 25 on the third drum 23 decreases. Only the wrapping position of the elastic body 25 changes without changing. When the energy is released, the amount of the elastic body 25 wrapped around the first drum 22 increases, and the amount of the elastic body 25 wrapped around the second drum 24 decreases.

The main parts have been described above, and the detailed technical explanation of the configuration is as follows. Elastic body 25
The first portion 25a of the elastic body 25 is in direct contact with the outer periphery of the first drum 22, and the second portion 25a of the elastic body 25 is in direct contact with the outer periphery of the first drum 22.
e is in direct contact with the outer periphery of the second drum 24. Further, the third portion 25c is also connected to the third drum 23.
are in direct contact with. Therefore, a frictional force acts between the elastic body 25 and the first drum 22, second drum 24, and third drum 23 to prevent relative displacement in the circumferential direction, and the fourth portion 25b of the elastic body 25 ,25
Even if elongation occurs in d, the tensile strain is the elastic body 25
does not propagate over the entire length of , and almost the fourth part 2
It is limited to only 5b and 25d. The direction in which the first portion 25a of the elastic body 25 is wound around the first drum 22, and the direction in which the third portion 25c of the elastic body 25 is wound around the first drum 22.
The winding directions on the drum 23 are opposite to each other as shown in FIGS. 3 and 4. Furthermore, the direction in which the third portion 25c of the elastic body 25 is wound around the second drum and the direction in which the second portion 25e of the elastic body 25 is wound around the second drum are opposite to each other. Moreover, the first drum 22, the third drum, and the second drum 24 are
They are connected by means 28 so as to rotate in opposite directions at a constant rotation rate. Elastic body 25
A fourth portion 25b, 25d of the drums passes through the space between each drum.

In FIG. 4, when a tension force F is applied on the second drum 24 during energy storage, the first drum 22 and the third drum 23, which are connected by means 28, rotate in the direction of the arrow. At this time, the first drum 22
The radius of the third drum 23 is R1, the radius of the third drum 23 is R2, the radius of the second drum 24 is R3, and the number of teeth of the connecting gears 28a, 28b, 28c of the means 28 is the same, and the relationship is R1<R2<R3. When the amount of rotation of the outer circumference is increased in the order of the first drum 22, the third drum 23, and the second drum 24, the fourth portions 25b and 25d of the elastic body 25 are tensile according to the difference in the amount of rotation of the outer circumference. The stress increases, and energy is accumulated in the elastic body 25 from the first drum 25 to the second drum 24 in sequence.

Although the number of 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 a shaft connected to each drum, and 27 and 29 indicate support stands that support the drums.

In FIG. 1, reference numeral 30 indicates a first gear connected to the third drum 23 and juxtaposed with the connecting gear 28b. An input/output shaft 31 for inputting and outputting energy is arranged near the first gear 30. The input/output shaft 31 is arranged to extend in the axial direction of the first drum 22 and the third drum 23, and the input/output shaft 31 is supported by bearings 33 provided at both ends of the input/output shaft 31. It is rotatably supported around the core.

A second gear 34 is fitted to the input/output shaft 31 . A spline process B is applied to the fitting portion of the input/output shaft 31 and the second gear 34. That is, the second gear 34 is movable in the axial direction of the input/output shaft 31 and can be engaged with the input/output shaft 31 in the rotational direction. Therefore,
During energy input, input torque is transmitted from the input/output shaft 31 to the second gear 34, and during energy regeneration, output torque is transmitted from the second gear 34 to the input/output shaft 31.

When energy is input, the second gear 3
4 is an input/output shaft 31 by a moving means (not shown).
the connecting gear 28a of the second drum 24
It's starting to fit together. When energy is regenerated, the second gear 34 is moved on the input/output shaft 31 by the moving means and meshes with the first gear 30 attached to the adjacent third drum 23. That is, by selecting the position of the second gear 34, the second gear 24 is brought into mesh with either the connecting gear 28a or the first gear 30.

The second gear 34 and the connecting gear 28a of the second drum 24 are gears with different numbers of teeth.
It is desirable to match the load characteristics at the time of output. This embodiment shows a case where the torque at the time of output may be smaller than the torque at the time of input. If the opposite characteristic is required, that is, if the torque at the input is required to be smaller than the torque at the output, a gear with a larger number of teeth is provided on the second drum 24. and the third drum connecting gear 28
b may be switched according to input and output. Further, it is desirable that the second gear 34 has a neutral position so that input and output of energy can be cut off in an emergency.

In the energy storage device configured in this way, when energy is input, the input/output shaft 3
1 is rotated in the direction of arrow A, and the second gear 34 is also rotated in the same direction. In this case, since the second gear 34 is engaged with the connecting gear 28a of the second drum 24, the second drum 24 is rotated in the direction in which the elastic body 25 is wound up. When the input of energy is completed, a braking device (not shown) is activated to stop the rotation of each drum.

During energy regeneration, the second gear 34 moves on the input/output shaft 31, and the second gear 34 meshes with the first gear 30. Then, by releasing the above-mentioned braking device, each drum is rotated in the opposite direction to that at the time of energy input. However, in this case, since the second gear 34 is rotationally driven by the rotation of the third drum 23, the rotation direction of the second gear 34 is the same as the rotation direction when energy is input. That is, the rotational direction of the input/output shaft 31 during energy regeneration is the same direction A as the rotational direction during energy input.

In this way, the input shaft 31 itself is connected to the second gear 3.
4 is supported so that it can be selectively engaged with the connecting gear 28a and the first gear 30, so the configuration of the entire device is greatly simplified.

[Effects of the invention] As explained above, when using the energy storage device of the invention, the input/output shaft for inputting and outputting energy has a structure that is movable in the axial direction of the input/output shaft and in the rotational direction. mate with an engageably supported second gear, the second gear juxtaposed with the coupling gear of any drum, and adjacent the drum to which the first gear is attached. Since it is possible to selectively mesh with either one of the connecting gears of the drum, the entire energy storage device including the reversing device can be made much more compact than when a reversing device is provided separately. Moreover, costs can also be reduced.

[Brief explanation of the drawing]

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 FIG. 1,
FIG. 3 is an overall perspective view of the energy storage device of the present invention, and FIG. 4 is a sectional view of the device of FIG. 3. 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, 28 ... Means (connection gear), 3
0...First gear, 31...Input/output shaft, 34...
Second gear.

Claims (1)

[Claims for Utility Model Registration] (1) Parallel to each other and rotatable around an axis,
a third drum comprising a first drum, a second drum, and an intermediate drum disposed between the first drum and the second drum; a first portion wound around the first drum; and the second
a second portion wound around the drum; a third portion wound around the third drum;
A string-shaped string having a fourth portion connecting each drum, an end of the first portion being fixed to the first drum, and a second end being fixed to the second drum. an elastic body; the first drum, the second drum, and the third drum; an amount of outer circumferential rotation of the second drum is larger than an amount of outer circumferential rotation of the third drum; means for connecting the drums so that the amount of rotation of the outer periphery of the first drum is larger than the amount of rotation of the outer periphery of the first drum; A first gear is provided on any one of the drums to be juxtaposed with the connecting gear of the drum, an input/output shaft for inputting and outputting energy is provided near the first gear, and the input/output shaft is provided with an input/output shaft for inputting/outputting energy. , a second gear supported to be movable in the axial direction of the input/output shaft and engageable in the rotational direction is fitted, and the second gear is connected to the first gear and the second gear. An energy storage device characterized in that the first gear can be selectively engaged with a connecting gear of a drum adjacent to the drum to which the first gear is attached. (2) The energy storage device according to claim 1, wherein the fitting portion between the input/output shaft and the second gear is splined.