JPH0643564Y2 - 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 elastic energy storage device that achieves high energy input / output characteristics while downsizing the entire device.

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

In the energy storage device disclosed in JP-A-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, the present applicant has a method in which a part of the elastic body is largely distorted by a certain amount and the region is sequentially expanded, and at the same time, the elastic body having a small elastic elongation has a small diameter drum. An energy storage device has been proposed that can efficiently input and output energy even when the initial strain when wound is 0 (Japanese Patent Application No. 61-168033).

The energy storage device of Japanese Patent Application No. 61-168033 is, for example, as shown in FIG.
And a large-diameter drum 2 having a large outer peripheral rotation amount, an intermediate drum 3 (a plurality of intermediate drums 3 having an intermediate outer peripheral rotation amount may be provided),
A string-shaped elastic body 4 is stretched 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.

In such an energy storage device, a conventional two-drum system (FIG. 8) and a conventional three-drum system in which drums having radii R1, R2, and R3 are connected by gears having the same number of teeth are shown in FIGS. As shown in the comparison with the case of the drum system (Fig. 7), by providing the intermediate drum, the energy input and output efficiency can be improved, and the output can be obtained even when the initial strain of the elastic body is zero. It has become possible. It has been found that the energy input / output efficiency increases as the number of intermediate drums increases.

[Problems to be Solved by the Invention] In the energy storage device as described above, efficiency can be increased by increasing the number of intermediate drums as described above. However, merely increasing the number of intermediate drums is proportional to the increase. Then, there remains a problem that the entire device becomes large.
In addition, since each intermediate drum is sequentially connected by the mechanical connecting means, as the number of intermediate drums increases, the mechanical loss due to the mechanical connecting means increases. There is also a problem that the degree of improvement is small.

As another problem, the following problem still remains.

That is, in the energy storage device as described above,
In order to increase the total amount of energy input and output, it is effective to increase the length of the elastic body and wind the elastic body in multiple layers around the drum (large diameter drum and small diameter drum).

However, when the elastic body is wound in multiple layers on the drum,
Since the winding diameter changes, the elastic body may be excessively drawn on the large-diameter drum as the winding layer increases, and the elastic body may be insufficiently fed on the small-diameter drum as the winding layer decreases. That is, the tension (strain) of the elastic body changes according to the change of the winding layer, and the input / output torque characteristics change. Especially,
When the number of winding layers increases on the large-diameter drum side, the elastic body may be pulled too much between the adjacent intermediate drums, and the torque balance between the drums may not be balanced by simply coupling the drums.

As one of the methods for preventing this, although the application has not yet been published, the applicant of the present invention first provided a taper drum in which the drum surface was formed as a taper in the direction along the drum axis as an intermediate drum. The elastic body winding position (winding diameter) on the taper drum is changed according to the change in the number of winding layers on the large diameter drum, and the elastic body tension between the large diameter drum and the taper intermediate drum is fixed to a predetermined value. A mechanism that can maintain the value and a structure in which a plurality of tapered intermediate drums are provided in the mechanism have been proposed (Japanese Utility Model Application No. 63-29803).

Further, a plurality of pulleys are provided so as to face one tapered intermediate drum, and the elastic body is passed over each pulley and each different diameter position of the tapered intermediate drum a plurality of times. A structure has been proposed in which the function equivalent to that provided can be exhibited (Japanese Patent Application No. 63-253829).
Issue).

However, in these proposed structures, it is necessary to set the elastic body winding position on the taper intermediate drum to a specific drum diameter position depending on the transition state of the elastic body at that time,
In order to keep the position of the elastic body entering the intermediate drum at a specific position along the drum axis and to keep the length of the elastic body between the intermediate drum and the large-diameter drum and / or the small-diameter drum constant. , When winding and unwinding an elastic body around a large-diameter drum and / or a small-diameter drum,
Alternatively, the small diameter drum is moved (reciprocating) in the direction along the drum axis. Therefore, it is necessary to secure this movement allowance as a device, and there is a problem in that the device is increased in size accordingly.

In consideration of the above problems, the present invention is capable of easily adopting a multi-layer winding of elastic body in order to increase energy input and output efficiency while increasing the total size of stored energy while suppressing an increase in size of the entire device. The purpose is to provide a storage device.

[Means for Solving the Problems] In the elastic energy storage device of the present invention which meets this object, a plurality of drums are arranged such that their axes are parallel to each other, and the plurality of drums are rotated around the outer periphery in the order of arrangement. In order to increase the amount of rotation and to enable interlocking rotation, a mechanical connecting means is used to connect the outer peripheral surface of the intermediate drum and the outer peripheral surface of both drums between the drum having the minimum outer peripheral rotation amount and the drum having the maximum outer peripheral rotation amount. In an elastic energy storage device that spans a string-shaped elastic body that is capable of storing its own strain energy by transferring through it and discharging the stored strain energy,
The length of the elastic body is set such that the elastic body is wound around the drum having the minimum outer peripheral rotation amount and the drum outer peripheral surface having the maximum outer peripheral rotation amount in a plurality of winding layers, and from the drum having the minimum outer peripheral rotation amount to the intermediate drum. Alternatively, the elastic body winding position on at least one intermediate drum from the drum having the maximum outer peripheral rotation amount to the intermediate drum is set to a specific position in the direction along the axial center of the intermediate drum, and the elastic body winding position is set to the specific position. Between the intermediate drum and the drum having the minimum outer peripheral rotation amount or the drum having the maximum outer peripheral rotation amount, a plurality of rotatable pulleys in which elastic bodies are successively provided are provided, and the plurality of pulleys are connected to the drum having the minimum outer peripheral rotation amount. Or, according to the elastic body winding or rewinding position on the drum having the maximum outer peripheral rotation amount, it is folded in an accordion shape in the direction along the axis of the drum with the specific position as a reference. Consists stretchable to those provided.

[Operation] In such a device, the elastic body is wound in a plurality of winding layers on the outer peripheral surfaces of the drum having the minimum outer peripheral rotation amount and the drum having the maximum outer peripheral rotation amount, so that a large amount of accumulated and output energy is secured. To be done. Since the elastic body winding position on the intermediate drum can be controlled to a specific position, it becomes possible to adopt a taper intermediate drum,
When the winding layer of the elastic body changes on the drum with the minimum outer peripheral rotation amount or the drum with the maximum outer peripheral rotation amount, too much tension or insufficient feeding of the elastic body causes the elastic body winding position (winding diameter) on the taper intermediate drum. It can be resolved by changing.

Between the intermediate drum and the drum having the minimum outer peripheral rotation amount or the drum having the maximum outer peripheral rotation amount, a plurality of pulleys which are foldable and extendable in an accordion shape based on the specific position are arranged. Since the group is folded and expanded into an accordion shape in accordance with the elastic body winding around the drum having the minimum outer peripheral rotation amount or the elastic body rewinding from the drum having the maximum outer peripheral rotation amount, the drum having the minimum outer peripheral rotation amount or Even if the position of the drum having the maximum outer peripheral rotation amount remains fixed, the length of the elastic body between the drum and the intermediate drum is kept constant, and at the same time, the elastic body enters the intermediate drum. The reference position can be maintained at a fixed position unless it is changed on the intermediate drum side. As a result, a moving (reciprocating) mechanism in a direction along the axis of the drum having the minimum outer peripheral rotation amount and / or the drum having the maximum outer peripheral rotation amount becomes unnecessary, and the size of the entire apparatus can be significantly reduced.

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

First Embodiment FIGS. 1 to 4 show an elastic energy storage device according to a first embodiment of the present invention. In the figure, 11 is a small-diameter drum as a drum of the minimum outer peripheral rotation amount, 12 is a large-diameter drum as a drum of the maximum outer peripheral rotation amount, and 13 is an intermediate drum. The intermediate drum 13 is a tapered drum whose surface is tapered in a direction along the drum axis.

The shafts 14, 15, 16 of the plurality of drums are arranged so as to be parallel to each other (parallel to each other in plan view), and the small diameter drum 11, the intermediate drum 13, and the large diameter drum 12 are They are connected by a mechanical connecting means 17 so that the outer peripheral rotation amount increases in the order in which they are arranged and can rotate in conjunction. A string-shaped elastic body 18 is bridged between the small-diameter drum 11 and the large-diameter drum 12, and the elastic body 18 is bridged between the drums in a manner described below. The elastic body 18 is made of a material capable of storing strain energy therein by being stretched. When strain energy is accumulated, the elastic body 18 has a portion 18a wound around the outer peripheral surface of the small-diameter drum 11 rewound, and is sequentially stretched between the portion wound on the intermediate drum and the stretched elastic body 18. Finally wrapped part 18
It is wound around the outer peripheral surface of the large diameter drum 12 as b. When releasing energy, the elastic body 18 is moved in the opposite direction to the above.

The length of the elastic body 18 is wound in a plurality of winding layers on the outer peripheral surface of the small-diameter drum 11 before the strain energy is accumulated, and in a plurality of winding layers on the outer peripheral surface of the large-diameter drum 12 after the strain energy is accumulated. The length is set so that it can be wound around. The drawing shows only the winding state of the uppermost layer of the elastic body 18.

Among the mechanical connecting means 17, for connecting the large diameter drum 12 and the intermediate drum 13, crank arms (or crank wheels) 19 and 19 'provided at the end of the shaft 16 and connecting rods 20 therefor, Crank arms 21, 21 'which are interlocked via 20', further crank arms 22, 22 ', connecting rod 2
3, 23 ', crank arms 24, 2 provided at the end of the shaft 15
4 ', and the large-diameter drum 12 and the intermediate drum 13 are synchronously rotated at the same rotation speed. The gear mechanism 2 is provided between the intermediate drum 13 and the small diameter drum 11.
5. Connected via the continuously variable transmission 26, the difference in rotational speed between the drums can be changed by adjusting the speed of the continuously variable transmission 26.

Three pulleys arranged adjacent to the intermediate drum 13 in a direction parallel to the axis of the intermediate drum 13 and capable of interlocking movement in the direction.
27, 28 and 29 are provided. Each pulley 27, 28, 29 is independently rotatably supported in the moving frame body 30,
Each pulley is inclined with respect to the axis 15 of the intermediate drum 13. The moving frame body 30 is configured to be moved along a guide rail 31, and the guide rail 31 moves toward the large diameter side of the intermediate drum 13 with respect to the shaft 15 of the intermediate drum 13.
It is arranged so as to be inclined toward 13. A nut 32 is fixed to the moving frame body 30, and the nut 32 is a guide rail.
It is screwed to a screw rod 33 extending in parallel with 31. Therefore, the moving frame body 30 is moved along the guide rail 31 by the rotation of the screw rod 33, and the plurality of pulleys 27, 28, 29 are interlocked with the movement of the moving frame body 30. The elastic body 18 is sequentially passed over different positions (different diameter positions) in the direction along the axis of the pulleys 27, 28, 29 and the intermediate drum 13, and is reciprocated a plurality of times.

The screw rod 33 that controls the movement of the frame body 30 is the Geneva gear 34, 35.
Via the Geneva gears 34, 35 (Geneva mechanism), the movement is intermittently performed. This intermittent movement is performed by the gear mechanism 25 that is rotated in conjunction with the large-diameter drum 12 to generate the Geneva gears 34, 35.
This is performed by rotating the (Geneva mechanism), and these gear systems are set so that the intermittent feed is performed at the moment when the winding layer of the elastic body 18 changes on the large diameter drum 12. By this intermittent feeding, the pulleys on the frame body 30 are moved together with the frame body 30, so that the winding diameter of the elastic body 18 on the taper drum 13 changes, and the winding diameter changes.

Between small-diameter drum 11 and intermediate drum 13, and large-diameter drum
Between the intermediate drum 12 and the intermediate drum 13, four in this embodiment.
Pulleys 36a, 36b, 36c, 36d and 36e, 36f, 36g, 36h
Is provided. Each pulley has its own bearing 3
7, via pins 38 each base 39a, 39b, 39c, 39d and 3
It is rotatably supported by 9e, 39f, 39g, and 39h. Adjacent bases are connected via respective connectors 40a, 40b, 40c and 40d, 40e, 40f and a pin 41 between them. Further, each base is connected to a corresponding slide base 45 via a pin 42, a plate 43, and a pin 44 so that the pin 44 can slide along a guide groove 46 of the slide base 45. . The bases, together with the corresponding pulleys, can be folded and extended in an accordion shape about the pins 41 and 42 as fulcrums in the direction indicated by the arrow in FIG. FIG. 2 shows the extended state, and FIG. 3 shows the folded state up to the folding end.

As shown in FIG. 4, the pin 44 guided by the slide base 45 is extended and connected to the guide block 47.
The guide block 47 has a guide 48 protruding therefrom. The guide 48 is slidably inserted into the spiral guide groove 50 of the weaving rod 49, and the pin 44 is moved to the slide base 45 via the guide 48 and the guide block 47 as the weaving rod 49 rotates. The pulleys are reciprocally moved along with each other, so that each pulley is folded into an accordion shape, and then expanded. The weaving rod 49 rotates in the gear 5
The rotation is performed in accordance with the rotation of the small diameter drum 11 and the large diameter drum 12 via 1, 52 and 53, 54.

Incidentally, reference numeral 61 in FIG. 1 denotes an input / output shaft of the present apparatus, and energy is input / output via gears 62, 63.

In the elastic energy storage device configured as described above, at the time of energy input, the elastic body 18 initially has the small-diameter drum 11
It is wound in multiple layers on the outer peripheral surface. Input, output shaft 61,
When each drum is rotationally driven by the input / output gears 62, 63, the elastic body 18 is rewound from the small diameter drum 11, and the pulleys 27, 2
After being wound around the intermediate drum 13 three times via 8 and 29, it is transferred to the large-diameter drum 12 side, and the elastic body 18 with large strain is increased between the drums and between the winding positions of the intermediate drum 13. It is sequentially wound around the outer peripheral surface of the diameter drum 12.

Although only one taper drum 13 is used as the intermediate drum, the elastic body 18 reciprocates three times between the pulleys 27, 28, and 29, and the winding position is sequentially moved to the large diameter side on the same taper drum. As a result, the elastic body 18 is sequentially stretched as if three intermediate drums having different roller radii are arranged. In this way, by using only one intermediate drum 13, the elastic body 18 is reciprocated between the intermediate drum 13 and the pulleys 27, 28, 29, and the elastic body 18 is passed over to the positions of different diameters on the intermediate drum 13 multiple times. Distortion of elastic body 18 is intermediate drum
It will be gradually increased even in 13 parts, and as with the arrangement of many intermediate drums, extremely high efficiency energy input,
Output is possible. Also, compared with the case of arranging a large number of intermediate drums, the number of gears and the like in the mechanical coupling means can be smaller and the elastic body guiding means such as guide pulleys can be smaller, so that mechanical loss and friction loss can be reduced. Becomes smaller and the efficiency is further improved.

In the transition of the elastic body 18, the elastic body 18 is intermittently moved in the direction A of FIG. 1 by the intermittent movement of the frame body 30 by the Geneva gears 34 and 35 at the moment when the number of winding layers of the elastic body 18 on the large diameter drum 12 increases. The winding diameter on the intermediate drum 13 which is moved and is a taper drum is also increased synchronously. As a result, large diameter drums
When the winding radius on 12 is R1 and the final winding radius on the intermediate drum 13 is R2, (R1-R2) / R2 is kept constant, and the change in tension of the elastic body 18 is absorbed during this period. . Therefore, the elastic body 18 is prevented from being overtightened during this time. The above control is performed every time the number of wound layers of the elastic body 18 increases on the large-diameter drum 12, so that the energy input characteristic is stabilized.

At the time of energy output, the operation is the reverse of the above, and the elastic body 18 is generated each time the number of winding layers on the large diameter drum 12 decreases.
Is intermittently fed in the direction opposite to the direction A in the figure, and the intermediate drum 13
The upper winding diameter is changed to absorb the change in tension between the drums 12 and 13, and stable output characteristics can be obtained. Further, the multi-layer winding increases the energy storage capacity and the output energy amount.

When the elastic body 18 is moved, the winding position on the taper intermediate drum 13 must be maintained at a certain fixed position while the number of winding layers on the small diameter drum 11 or the large diameter drum 12 does not change. On the small-diameter drum 11 and the large-diameter drum 12, when the winding or rewinding position of the elastic body 18 changes in the direction along the drum axis, the weaving rod 49 is rotated in conjunction with the rotation of the drum, whereby each Pulley 36
a, 36b, 36c, 36d and 36e, 36f, 36g, 36h are folded in the direction of the arrow in FIG. 2, or the pulleys folded as shown in FIG. 3 are in the state shown in FIG. Stretched in the direction. Since the folding and stretching are performed based on the position where the elastic body 18 enters the intermediate drum 13, and are performed in synchronization with the rotations of the small diameter drum 11 and the large diameter drum 12, the winding layers on both drums Until the number changes, the winding position of the elastic body 18 on the intermediate drum 13 is kept at a predetermined constant position, and between the intermediate drum 13 and the small diameter drum 11 and between the intermediate drum 13 and the large diameter drum 12. The length of the elastic body 18 is also kept constant.

As a result, as the applicant previously proposed, a small diameter drum
Since it is not necessary to move the 11 and the large-diameter drum 12 in the direction along the drum axis, the diameter of the entire apparatus can be significantly reduced while allowing multi-layer winding.

In the above embodiment, the accordion-foldable and extendable pulley groups are provided both between the intermediate drum 13 and the small-diameter drum 11 and between the intermediate drum 13 and the large-diameter drum 12. Even if only one side is provided, the device can be downsized accordingly.

Furthermore, by disposing two sets of each of the pulley groups on the small-diameter drum and / or the large-diameter drum, it is possible to suppress the change in tension due to the change in the winding position of the intermediate drum.

Second Embodiment FIG. 5 shows a second embodiment of the present invention.

In this embodiment, a plurality of intermediate drums 71, 72, 73 are provided (three in this embodiment), and each intermediate drum is a pulley-shaped drum having a small dimension in the direction along the axis, and the mechanical communication is performed sequentially. They are connected by means 74. Between the small diameter drum 75 and the intermediate drum 71 and between the large diameter drum 76 and the intermediate drum 73
A guide device 79 for an elastic body 78, which is the same as that shown in FIG. 1 and is capable of folding and extending a plurality of pulleys 77 in an accordion shape, is provided between and.

In such an embodiment device, the intermediate drums 71, 72,
The position of the elastic body 78 on the 73 in the direction along the drum axis is set to a fixed position, and the small diameter drum 7
5. A plurality of pulleys 77 are folded and extended according to the winding and unwinding of the elastic body on the large-diameter drum 76.

In this embodiment, since the taper drum is not used as the intermediate drum, the winding position on the taper drum is changed when the number of elastic body winding layers changes on the small diameter drum and the large diameter drum as in the first embodiment. However, the intermediate drums 71, 72, 73 can be extremely miniaturized, and the position of the intermediate drums can remain fixed. The weight can be reduced. Other functions are the same as in the first embodiment.

[Advantages of the Invention] As described above, in the elastic energy storage device of the present invention, the elastic body winding position on the intermediate drum is set to a specific position along the drum axis, and the specific position is used as a reference. , A plurality of pulleys are folded and extended in an accordion shape according to winding and unwinding of the elastic body on the drum having the minimum outer peripheral rotation amount and / or the maximum outer peripheral rotation amount. And the elastic body length between the drum and the intermediate drum can be kept constant without moving the drum having the maximum outer peripheral rotation amount in the direction along the drum axis, and multilayer winding can be performed to store energy. It is possible to downsize the entire device while improving the output amount.

[Brief description of drawings]

1 is a schematic plan view of an elastic energy storage device according to a first embodiment of the present invention, FIG. 2 is a perspective view of a pulley portion of the device of FIG. 1, and FIG. 3 is a folding of the pulley portion of FIG. 4 is a plan view of the apparatus of FIG. 2, FIG. 5 is a schematic plan view of an elastic energy storage device according to a second embodiment of the present invention, and FIG. 6 is Japanese Patent Application No. 61-168033. FIG. 7 is a perspective view of the energy storage device proposed in FIG. 7, FIG. 7 is an energy output efficiency characteristic diagram of the device of FIG. 6, and FIG. 8 is an energy output efficiency characteristic diagram of a two-drum type energy storage device. 11, 75 ...... Minimum peripheral rotation amount drum 12,76 …… Maximum peripheral rotation amount drum 13,71,72,73 …… Intermediate drum 14,15,16 …… Drum shaft 17,74 …… Mechanical connection Means 18, 78 ... Elastic bodies 19, 19 ', 21, 21', 22, 22 ', 24, 24' ... Crank arms 20, 20 ', 23, 23' ... Connecting rod 25 ... Gear mechanism 26 ... continuously variable transmission 27, 28, 29 ... pulley 30 ... moving frame 31 ... guide rail 32 ... nut 33 ... screw rod 34, 35 ... Geneva gear 36a, 36b, 36c, 36d, 36e, 36f, 36g, 36h, 77 …… Pulley 37 …… Bearing 38 …… Pin 39a, 39b, 39c, 39d, 39e, 39f, 39g, 39h …… Base 41, 42 …… Pin 43 …… Plate 44 …… Pin 45 …… Slide base 46 …… Guidance groove 47 …… Guidance block 48 …… Guidance element 49 …… Weaving rod 50 …… Helix guide groove 51, 52 …… Weaving rod 61 …… Input and output shaft 79 …… Guidance device

Claims (1)

[Scope of utility model registration request] 1. A plurality of drums are arranged such that their axes are parallel to each other, and the plurality of drums are connected by a mechanical connecting means such that the outer peripheral rotation amount becomes large and they can rotate in an interlocking manner in the order of arrangement. However, between the drum having the minimum outer peripheral rotation amount and the drum having the maximum outer peripheral rotation amount, the strain energy of itself is stored by transferring the outer peripheral surfaces of both drums via the outer peripheral surface of the intermediate drum. In an elastic energy storage device in which a string-shaped elastic body capable of releasing strain energy is spanned, a length of the elastic body is set to a drum having the minimum outer peripheral rotation amount and a drum having the maximum outer peripheral rotation amount. An elastic body on at least one of the intermediate drum from the drum having the minimum outer peripheral rotation amount to the intermediate drum or the drum having the maximum outer peripheral rotation amount to the intermediate drum. Between the intermediate drum and the drum having the minimum outer peripheral rotation amount or the drum having the maximum outer peripheral rotation amount, the fixing position is a specific position in the direction along the axis of the intermediate drum, and the elastic body winding position is the specific position. In, a plurality of rotatable pulleys over which the elastic body is successively provided is provided, and the plurality of pulleys are provided in accordance with the elastic body winding or rewinding position on the drum of the minimum outer peripheral rotation amount or the drum of the maximum outer peripheral rotation amount. An elastic energy storage device, characterized in that the elastic energy storage device is arranged so as to be foldable and extendable in an accordion shape based on the specific position in a direction along an axis of the drum.