JPS6231216B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a damper, and particularly to a viscous damper suitable for use as a load device for health promotion equipment and the like.

It is known that a bicycle-type health promoting device has been proposed as an auxiliary means for improving health, and has already been commercialized. By the way, most of the loading devices of this type of health promoting device use solid friction force, which is not necessarily satisfactory from the viewpoint of long-term stability of the resistance force. on the other hand,
A liquid resistance type load device using a liquid has also been proposed. For example, a viscous damper is preferable as this type of load device because the rotational angular velocity and the resistance force, that is, the torque are in a proportional relationship. However, if we assume a foot-operated health promotion device that uses pedals,
A form suitable for the exercise itself is to have the resistance force be small near the vertical dead center of the pedal crank, and be large elsewhere. In addition, there are differences in physical strength depending on the individual who uses it.
It is preferable to add a means for changing the resistance force in addition to the rotational speed so that each person can improve their physical strength in an optimal state.

The present invention has been made in view of the above points,
The purpose is to provide a damper that can vary the resistance force depending on the rotational position, and can also be provided with a resistance variable means if necessary, and is particularly suitable for application as a load device for health promotion equipment. There is a particular thing. According to the present invention, the object is to provide a frame body whose inner wall surface forms a cylindrical space, a highly viscous fluid filled in the cylindrical space, and a recess provided in the inner wall surface. and a major diameter portion having an outer diameter smaller than the diameter of the cylindrical space and a minor diameter portion having an outer diameter smaller than the major diameter portion, and the axis of the cylindrical space is centered on the axis of the cylindrical space. The rotating body is supported by the frame so as to be rotatable within the space, and the crank device is connected to the rotating body to cause the rotating body to rotate. The short diameter portion is positioned opposite to a portion of the inner wall surface excluding the recess so as to reduce the viscous shearing force of the rotating body to the high viscosity fluid when the rotating body is located at the dead center and the bottom dead center, respectively. This is achieved by a damper for a health promotion device configured such that the long diameter portion is located opposite to the recess excluding the portion of the inner wall surface.

Next, a preferred specific example of the present invention will be explained based on the drawings.

1 to 3, reference numeral 1 denotes a frame to which a handle 2, a saddle 3, etc. are attached, and a pedal crank 5 is attached to the frame 1 via a damper 4. The damper 4 fixed to the frame 1 includes a sealed cylindrical frame 6 and a rotating body 7 provided within the frame 6. The frame body 6 consists of a cylindrical portion 8 and lids 9 and 10 that close both end surfaces of the cylindrical portion 8, and a rotating shaft 11 connected to the crank 5 extends through approximately the center of the lids 9 and 10. The rotating body 7 is fixed to the shaft 11 by means such as a pin 12. Cylindrical inner surface 1 of cylindrical portion 8
3 is provided with recesses 14 and 15 facing each other, and an inner surface 13 as an inner wall surface of the cylindrical portion 8.
is formed to have an inner diameter a and an inner diameter b smaller than the inner diameter a with respect to the axial direction A of the rotating body 7.
That is, the inner surface 13 forms a cylindrical space. The rotating body 7 consists of a large diameter part 16 as a long diameter part having a diameter D, and a small diameter part 17 as a short diameter part having a diameter d (D>d).
The outer surface 18 is formed to be close to the inner surface 13 of the cylindrical portion 6 having an inner diameter b except for the recesses 14 and 15. A chamber 19 defined by the frame 6 is filled with an oil liquid as a fluid, preferably a high viscosity oil liquid such as silicone oil, which applies rotational resistance to the rotating body 7 due to viscous shearing force caused by the rotation of the rotating body 7. Force arises. room 19
, a coil spring 20 is installed between the lid 9 and the rotating body 7, and the spring 20
Due to the stretching force, the lid 9 and the rotating body 7 are urged in opposite directions. Reference numeral 21 denotes a cylindrical projection protruding from the lid 10, and a threaded portion 22 is provided on the outer surface of the projection 21. The cap 23 is screwed together. The cap 23 is engaged with a retaining ring 24 fitted on the shaft 11, and rotation of the cap 23 about the shaft 11 causes the cap 23 to move in the axial direction A.
The relative position between the frame body 6 and the rotating body 7 is changed. Due to a change in the relative position between the frame body 6 and the rotating body 7, the overlapping state of the outer surface 18 and the inner surface 13 of the cylindrical portion 8 having an inner diameter b changes, and as the rotating body 7 rotates,
The resistance force against the rotating body 7 changes.

In the health promoting device 31 having the damper 4 configured in this way, by stepping on the pedal 32 attached to the crank 5, the shaft 11 is rotated and the rotary body 7 is rotated in the chamber 19. A resistance force is generated in the rotating body 7 due to the viscous shearing force of the oil in the chamber 19 due to the rotation. Here, the crank 5 is rotated so that the outer surface 18 of the large diameter portion 16 of the rotating body 7 faces the recesses 14 and 15, respectively, when each of the pedals 32 is located at the top dead center and the bottom dead center. When fixed at 11,
When the rotating body 7 rotates due to depression of the pedal 32, when the pedal 32 is located at the top dead center and the bottom dead center, the resistance force against the rotating body 7 is reduced due to the recesses 14 and 15, and the pedal 32 are respectively located between top dead center and bottom dead center,
Since the rotating body 7 is rotated with the outer surface 18 of the large diameter portion 16 close to the inner surface of the cylindrical portion 8, the resistance force against the rotating body 7 becomes large. That is, according to the damper 4, at a position where the torque generated by pressing the pedal 32 is small, the resistance force can be similarly small, while at a position where the pressing force against the pedal 32 is large, the resistance force can be large. In addition, since the resistance force can be made proportional to the rotational speed, it becomes a suitable load device for the health promoting device 31. Furthermore, in the damper 4, by rotating the cap 23, the amount of opposing surfaces between the outer surface 18 of the large diameter portion 16 and the inner surface 13 of the cylindrical portion 8 having the inner diameter b can be increased or decreased.
The resistance force against the rotating body 7 can be increased or decreased during the rotation of
1 can be provided.

Next, another preferred embodiment according to the present invention will be described as a first example.
The explanation will be made based on FIGS. 4 to 6. The damper 40 includes a cylindrical frame 42 having a mounting flange 41 and a rotating body 43 provided within the frame 42 . The frame body 42 consists of a cylindrical portion 44 and a lid 45 that closes one end surface of the cylindrical portion 44.
A rotating shaft 11 connected to the crank 5 extends through approximately the center of the lid 45, and a rotating body 43 is fixed to the shaft 11 by means such as a pin 46. Cylindrical inner surface 47 as the inner wall surface of the cylindrical portion 44
are provided with recesses 48 and 49 facing each other, and the inner surface 47 of the cylindrical portion 44 is formed to have an inner diameter a and an inner diameter b smaller than the inner diameter a in the axial direction A. . That is, the inner surface 47 forms a cylindrical space. The rotating body 43 has an annular protrusion 52 consisting of a large diameter part 50 as a long diameter part with a diameter D and a small diameter part 51 as a short diameter part with a diameter d (D>d).
is formed integrally with the cylindrical main body 53, and the large diameter portion 50 has an outer surface 54 formed in the recesses 48 and 49.
It is formed so as to be close to the inner surface 47 of the cylindrical portion 44 having an inner diameter b. A sealed chamber 55 defined by the frame 42 is filled with an oil as a fluid, preferably a high viscosity oil, and the viscous shearing force caused by the rotation of the rotor 43 creates a rotational resistance force on the rotor 43. occurs. A seal ring 56 is fitted into the main body 53 through which the shaft 11 passes approximately through the center, in order to make the chamber 55 liquid-tight. Oil leakage is prevented. Similarly, a seal ring 58 is attached to the disk-shaped wall 57 of the rotating body 43, and the seal ring 58 prevents oil from leaking through the gap between the shaft 11 and the rotating body 43. . The shaft 11 has an adjustment bearing 5 as an adjustment means.
A threaded portion 60 is provided on the outer surface of the bearing 59, and a cylindrical portion of the frame 42 extending from the lid 45 to the chamber 55 is attached to the bearing 59 in the threaded portion 60. The protrusions 61 are screwed together. Seal rings 62 and 63 are provided between the projection 61 and the bearing 59 and between the bearing 59 and the shaft 11, respectively, so that the chamber 55 is kept liquid-tight. The bearing 59 is engaged with a protrusion 64 fixed to the shaft 11 , and a retaining ring 65 is fitted onto the bearing 59 . Fixed position. The bearing 59 is formed to be rotatable about the shaft 11, and by rotating the bearing 59, the relative position between the frame body 42 and the rotating body 43 in the axial direction A can be changed. Due to the relative position change between the frame body 42 and the rotating body 43, the outer surface 54 and the inner diameter b
The amount of the opposing surface of the cylindrical portion 44 with the inner surface 47 increases or decreases, and the resistance force against the rotating body 43 during rotation of the rotating body 43 changes. 66 is an accumulator attached to the frame body 42, and the inside of the accumulator 66 is defined by a flexible member 67 into two chambers 68 and 69, and the chamber 68 is filled with high pressure gas. , the chamber 69 is communicated with the chamber 55, and like the chamber 55, the chamber 69 is filled with oil. The accumulator 66 has a bearing 59
The accumulator 66 is provided to compensate for the volume of the chamber 55 that increases or decreases when the relative position between the frame body 42 and the rotary body 43 changes due to rotation of the accumulator 66. When the volume of the chamber 55 decreases, the oil fluid flows out from the chamber 55 into the chamber 69. In addition, in the flow of oil into and out of the chamber 69,
The flexible member 67 is deformed and the high pressure gas within the chamber 68 is compressed and expanded.

The damper 40 configured in this manner also operates in the same manner as the damper 4, and when applied to the health promoting device 31, for example, when the shaft 11 is rotated and the rotating body 43 is rotated by pressing the pedal 32, the rotating body 43 is rotated. Due to the shearing force of the oil in the chamber 55 due to the rotation of the rotating body 4
3, resistance is generated. Furthermore, when the pedal 32 is located at the top dead center and the bottom dead center during the rotation of the rotating body 43, the resistance force against the rotating body 43 is reduced due to the recesses 48 and 49, and the pedal 32
are located between the top dead center and the bottom dead center, respectively, since the outer surface 54 of the large diameter portion 50 approaches the inner surface of the cylindrical portion 44 and the rotating body 43 is rotated, the rotating body 4
The resistance against 3 becomes large. Note that due to the contact of the seal ring 56 with the frame body 42, a resistance force is similarly generated on the rotating body 43. Furthermore, in the damper 40, by rotating the bearing 59, the opposing area between the outer surface 54 of the large diameter portion 50 and the inner surface 47 of the cylindrical portion 44 having the diameter b can be increased or decreased.
The resistance force against the rotating body 43 can be increased or decreased during the rotation of the rotating body 43.

In the specific example described above, two recesses are provided facing each other, but the present invention is not limited to this, and only one recess may be provided.
may be provided in the chamber 55 so that the air chamber 70 compensates for changes in the volume of the chamber 55. In this case, it is not necessarily necessary to provide a recess on the air chamber 70 side.
In addition, the damper according to the present invention is not limited to being applied to a bicycle-type health promoting device, but may also be applied to other types of health promoting devices.

As described above, according to the present invention, the resistance force can be varied depending on the rotational position, and the resistance force can be variably set by a simple operation, so that it can be preferably applied as a loading device for a health promotion device. Further, according to the present invention, when the crank device is located at the top dead center and the bottom dead center, the short diameter portion of the rotating body is located opposite to a portion of the inner wall surface excluding the recess of the frame body, and the rotating body is Since the long diameter part of the body is located opposite to the recess excluding the part of the inner wall surface, the viscous shearing force on the high viscosity fluid of the rotating body can be reduced. For example, when applying the damper of the present invention to a bicycle-type health promotion device that uses a crank device equipped with pedals, the torque generated by pedal depression can be reduced. The torque required to rotate the crank device can be reduced at the top dead center and bottom dead center positions of the crank device, in other words, torque change characteristics that do not place undue strain on the legs. The damper can be used as a damper, and it is possible to comfortably perform exercise for a long period of time, which is the original purpose of improving health.

[Brief explanation of the drawing]

FIG. 1 is a side view of a health promoting device to which a preferred embodiment of the present invention is applied, FIG. 2 is a cross-sectional view of a specific embodiment of the present invention applied to the health promoting device shown in FIG. 1, and FIG. 3 is a sectional view of the specific example shown in FIG.
4 is a sectional view of another preferred example of the present invention applicable to the health promoting device shown in FIG. 1, FIG. 5 is a sectional view of the example shown in FIG. 4, and FIG. 6 is a sectional view of the example shown in FIG. FIG. 2 is a perspective view of a rotating body shown in FIG. 6... Frame body, 7... Rotating body, 14, 15... Recess, 16... Large diameter part, 17... Small diameter part.

Claims (1)

[Scope of Claims] 1. A frame body whose inner wall surface forms a cylindrical space, a highly viscous fluid filled in the cylindrical space, a recess provided in the inner wall surface, and a recess provided in the inner wall surface; It has a major diameter part with an outer diameter smaller than the diameter of the cylindrical space and a minor diameter part with an outer diameter smaller than the major diameter part, and the space is centered on the axis of the cylindrical space. The rotating body is supported by the frame so as to be rotatable within the frame, and the crank device is connected to the rotating body to cause the rotating body to rotate. The short diameter portion is located opposite to a portion of the inner wall surface excluding the recess, so as to reduce the viscous shearing force of the rotating body to the high viscosity fluid when the rotating body is located at the bottom dead center, and A damper for a health promotion device, wherein the long diameter portion is located opposite to the recess excluding the portion of the inner wall surface. 2. The inner wall surface is formed such that the diameter of the space has a first value and a second value larger than the first value in the axial direction of the space, and the diameter of the space has a first value and a second value larger than the first value. The outer diameter of the space is the first of the diameters of the space.
The position of the rotating body with respect to the frame body is adjusted so that the amount occupied by the long diameter portion in the space having the diameter of the first value in the axial direction of the space is smaller than the value of The damper for a health promotion device according to claim 1, further comprising an adjustment means for adjusting the axial direction. 3. The frame according to claim 2, wherein the frame is provided with an accumulator through which a highly viscous fluid filled in the cylindrical space flows in and out when adjusting the position of the rotating body with respect to the frame. Damper for health promotion equipment. 4. The damper for a health promotion device according to claim 2, wherein an air chamber is provided within the frame filled with the highly viscous fluid.