JPH0520913Y2 - - 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.

[Conventional technology]

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 winding an elastic body 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.

[Problem that the invention attempts to solve]

However, the energy storage device of Japanese Patent Application No. 61-168033 mentioned above still has some problems.
That is, in the above-mentioned energy storage device, the elastic body is placed across the intermediate drum,
In the case of this cross-crossing, a problem arises in that a large force acts in the axial direction of the bearing that supports the drum, increasing the friction of the bearing. In other words, as shown in Figure 3, the first
When intermediate drums 3, 4, and 5 are present between the drum 1 and the second drum 2, the elastic body 6 must be wound around these three intermediate drums in a cross-crossing manner. Therefore, the directions of the tensile forces applied to the parts of the elastic bodies connecting the drums vary, and the directions of the loads applied to the intermediate drums 3, 4, and 5 are as shown in FIG. 4, respectively.

In FIGS. 3 and 4, F' ₁ is the tensile force applied to the elastic body 6 between the first drum 1 and the third drum (intermediate drum) 3, and F' ₂ is the tensile force applied to the elastic body 6 between the first drum 1 and the third drum (intermediate drum) 3. This is the tensile force applied to the elastic body 6 between the third drum 3 adjacent to the drum 1 and the third drum 4 in the center. F′ ₃ is the tensile force applied to the elastic body between the third drum 4 in the center and the third drum 5 adjacent to the second drum 2, and F ₄ is the tensile force applied to the elastic body between the third drum 4 in the center and the third drum 5 adjacent to the second drum 2;
This is the tensile force applied to the elastic body between the drum 5 and the second drum 2.

A in FIG. 4 shows the load applied to the bearing that supports the third drum 3 in a vector diagram. In this case, the load applied to the bearing is FB ₁ which is the resultant force of the tensile force F' ₁ and the tensile force F' ₂ applied to the elastic body 6. 4 shows the load applied to the bearing that supports the third drum 4 in the center, and the load applied to the bearing in this case is the tensile force F′ ₂ applied to the elastic body 6 and the tensile force F The resultant force with ′ ₃ becomes FB ₂ . C in FIG. 4 shows the load applied to the bearing that supports the third drum 5, and the load applied to the bearing in this case is:
The resultant force of the tensile force _F'3 and the tensile force _F'4 applied to the elastic body 6 is _FB3 . In this way, by crossing the elastic bodies 6, the resultant force of the tensile force applied to the elastic bodies 6 acts on each bearing, so that
As the friction of the bearing increases, the input and output characteristics of the energy storage device require a large input at the time of input, and conversely the output decreases by the amount of friction.

The present invention focuses on the above-mentioned problem, and aims to improve the efficiency of the energy storage device by reducing the friction generated in the bearings that support each drum due to the tensile force of the elastic body.

[Means for solving problems]

The energy storage device of the present invention that meets this purpose includes a first drum to which one end of a string-like elastic body is fixed, a second drum to which the other end of the elastic body is fixed, and a second drum to which the other end of the elastic body is fixed. and an intermediate drum located between the first drum and the second drum, around which the elastic body is once wound, and the energy that increases as the amount of outer circumferential rotation of each drum goes from the first drum to the second drum. The storage device comprises a device in which the drums are connected by a connecting means such that the drums rotate in the same direction, and the portions of the elastic body connecting the drums are oriented parallel to each other. .

[Effect]

In the energy storage device configured in this way, the connecting means that connects each drum,
Since the rotation direction of each drum is the same, and the parts of the elastic body that connect the drums are parallel to each other, there is no need for sashing, and the load applied to the bearings that support the drums is transferred to the drums. The only difference is the tensile force of the elastic body. Therefore, the bearing friction of each drum is significantly reduced and the efficiency of the energy storage device is improved.

〔Example〕

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

1 and 2 show an energy storage device according to the 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. A third drum (intermediate drum) 33,3 with a diameter between the diameters of the two drums between 24 and 24;
It has 4,35. A string-like elastic body 25 is spirally wound around the first drum 22 and the second drum 24 via third drums 33, 34, and 35.

The elastic body 25 has a first portion 25a that is spirally wound in close contact with the first drum 22.
, a second part 25i attached to the second drum 24 and wound in a spiral shape, and a third part 33, 34, and 35 between the first drum 22 and the second drum 24, respectively. - Third portions 25c, 25e, and 25g that are wrapped twice, and fourth portions 25b, 25d, and 25f that connect each drum.
and 25h. the first portion 25a and the fourth portion 25a;
The portion 25b and the third portion 25c are continuous in series in this order. That is, each part of the elastic body 25 is 25a, 25b, 25c, 25d, 25
They are continuous in series in the order of e, 25f, 25g, 25h, and 25i. End 25 of first portion 25a
a' is fixed to the first drum 22, and the end 25i' of the second portion 25i is fixed to the second drum 24.

The first drum 22, the second drum 24 and the third drum
The drums 33, 34, 35 are connected via a connecting means 28. The connecting means 28 connects the first drum 22, the third drum 33, 34, 35 and the second drum.
The drums 24 are all rotated in the same direction, and as you go from the first drum 22 to the second drum 24, the amount of rotation of the outer circumference of each drum (the circumference of an arbitrary point located on the outer circumference when the drum rotates) They are mechanically connected to each other so that the directional movement distance (defined as the amount of outer circumferential rotation) is large. In this embodiment, the connecting means 28 includes gears 28a, 28b, 28c, 28d, and 28e attached to each drum, and gears 28f, 28g, and
It is composed of 28h and 28i.

The axis of each drum and the axis of each gear are all located on the axis A, and the fourth portions 25b, 25d, 25f,
25h are parallel to each other. That is, each fourth portion is in a straight line when viewed from the axial direction of the drum as shown in FIG.

During energy storage, the amount of elastic body 25 wrapped around second drum 24 increases, the amount of wrapping around first drum 22 decreases, and the amount of wrapping of elastic body 25 on second drum 24 decreases. does not change, only the wrapping position of the elastic body 25 changes.
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.
i is in direct contact with the outer periphery of the second drum 24. Further, the third portions 25c, 25e, and 25g are also in direct contact with the third drums 33, 34, and 35. Therefore, the elastic body 25 and the first drum 2
2. Second drum 24, third drum 33 and 34
A frictional force acts between and 35 to prevent relative displacement in the circumferential direction, and the fourth portions 25b, 25 of the elastic body 25
Even if elongation occurs at d, 25f, and 25h, the tensile strain is not propagated over the entire length of the elastic body 25,
Almost the fourth portion 25b, 25d, 25f, 25h
only.

As described above, the first drum 22, the third drums 33, 34, 35, and the second drum 24 are connected by the connecting means 28 so as to rotate in the same direction at a constant rotation rate, The outer circumferential rotation amount of each drum is determined by the first drum 22, the third drum 23, 3
If the number is increased in the order of 4, 35, and the second drum 24,
Fourth portions 25b, 25d, 25 of elastic body 25
At f and 25h, the tensile stress is increased according to the difference in the amount of rotation of the outer circumference, 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 third drums (intermediate drums) is three in the illustrated example, it may be a combination of a plurality of drums arranged side by side. Also, 26 in the figure
a, 26b, 26c, 26d, and 26e indicate bearings that rotatably support shafts connected to each drum.

Next, the operation of the above energy storage device will be explained.

When energy is input, each drum rotates in the direction of arrow B in FIG. 1, and the elastic body 25 that is elastically deformed is wound around the second drum 24, thereby accumulating energy. In this case, the fourth portions 25b, 25d, 25f, 2
A tensile force acts on 5h, and the third drum 33, 34,
Bearings 26b, 26c, 26 supporting 35
The resultant force of these acts on d. That is, the first
A tensile force F ₁ in the fourth portion 25b and a tensile force F ₂ in the fourth portion 25d act on the bearing 26b that supports the third drum 33 adjacent to the drum 22. These tensile forces F ₁ and F ₂ are the first
As shown in the figure, since the forces act on the same straight line and the direction of the force is opposite to the third drum 33, the bearing 26b that supports the third drum 33 has a difference between the respective tensile forces, F ₂ −F ₁ acts. Similarly, a bearing 26c supporting the central third drum 34
A tensile force F ₂ in the fourth portion 25d and a tensile force F ₃ in the fourth portion 25f act on this.
The bearing 26d that supports the third drum 35 adjacent to the second drum 24 has a tensile force F3 in the fourth portion 25f and a tension force _F3 in the fourth portion 25f.
A tensile force F ₄ at h acts. As described above, the tensile forces acting on these bearings 26c and 26d are in a straight line, and the direction of the force is opposite to each drum, so that the bearing of the third drum 34 located in the center In 26c
A tensile force of F ₃ −F ₂ acts on the bearing 26d that supports the third drum 35 adjacent to the second drum 24, and a tensile force of F ₄ −F ₃ acts on the bearing 26d that supports the third drum 35 adjacent to the second drum 24.

The difference in tensile force mentioned above (F ₂ − F ₁ , F ₃ − _{F 2} , F ₄ − _{F 3} )
is significantly smaller than the resultant force of the tensile forces shown in FIG.
The load applied to 6d is small, and the friction of each bearing during energy input and output is significantly reduced.

In this embodiment, a gear is used as a means for connecting the drums, but the present invention is not limited to gears, and a structure using, for example, a timing belt or a chain may also be used.

[Effect of idea]

As explained above, when using the energy storage device of the present invention, the drums are connected by a connecting means such that the rotation directions of the drums are all in the same direction, and the orientation of each part of the elastic body connecting the drums is Since they are made parallel to each other, the load applied to the bearing supporting the intermediate drum is only the difference in the tensile force of the elastic body applied to the drum. Therefore, compared to a structure in which an elastic body is placed across an intermediate drum, the friction of the bearing during input and output of energy is significantly reduced, and the efficiency of the energy storage device can be improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an energy storage device according to an embodiment of the present invention, Fig. 2 is a plan view of the device shown in Fig. 1, and Fig. 3 is a structure based on the energy storage device of Japanese Patent Application No. 168033/1983. A to C in FIG. 4 are cross-sectional views showing an example of an energy storage device having a
FIG. 3 is a vector diagram of the tensile force applied to the intermediate drum of FIG. 20...Energy storage device, 22...First drum, 24...Second drum, 25...Elastic body, 25b, 25d, 25f, 25h...Fourth part of the elastic body connecting each drum , 26b, 26
c, 26d...Bearing, 28...Connection means,
33, 34, 35...Third drum (intermediate drum).

Claims (1)

[Scope of utility model registration request] a first drum to which one end of a string-like elastic body is fixed; a second drum to which the other end of the elastic body is fixed; and a drum located between the first drum and the second drum, The energy storage device has an intermediate drum around which the body is once wound, and the amount of rotation of the outer periphery of each drum increases as it goes from the first drum to the second drum. An energy storage device characterized in that the drums are connected by a connecting means in which all the drums rotate in the same direction, and the respective parts of the elastic body connecting the drums are oriented parallel to each other.