JP2005214350A - Damping-force adjustable damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damping-force adjustable damper, in which the damping force (torque) is simply adjustable. <P>SOLUTION: An elastic body (piston 4) putting contact pressure on a casing C is installed in the casing C. A shaft (piston rod 5) is thrusted into the elastic body, and pinching members 6, 7 are provided on both sides of the elastic body. A nut 8 is fit on at least one side of the pinching member. By turning the nut, the space between the pinching members is adjusted to control the contact pressure of the electric body to the casing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a damping force adjustment type damper that can adjust a damping force.

As a damper that can adjust a damping force (torque) without using hydraulic pressure, an invention described in JP-A-6-159432 has been conventionally known. This conventionally known damper adjusts the repulsive force of the spring in order to adjust the damping force.
JP-A-6-159432

Since the conventional damper as described above is a method for adjusting the repulsive force of the spring, there is a problem that the mechanism for adjusting the damping force (torque) is inevitably complicated.
An object of the present invention is to provide a damping force adjusting damper capable of adjusting a damping force with a simple configuration.

  According to a first aspect of the present invention, an elastic body that exerts a contact pressure on the casing is incorporated in the casing, a shaft is passed through the elastic body, and clamping members are provided on both sides of the elastic body. It is characterized in that a nut is fitted on the shaft on one side surface and the opposing distance between the clamping members is adjusted by rotating the nut to control the contact pressure of the elastic body against the casing.

The second invention is characterized in that a piston as an elastic body is incorporated into a cylinder as a casing, a piston rod as a shaft is passed through the piston, and a nut is fitted at a penetrating end of the piston rod. The invention of No. 3 is characterized in that a nut hole in which a nut is fitted at the stroke end of the piston is provided at the cylinder end.

The fourth invention is characterized in that a rotating body as an elastic body is incorporated in a casing, a rotating shaft as a shaft is passed through the rotating body, and a nut is fitted to a penetrating end of the rotating shaft.
The fifth invention is characterized in that a nut hole into which the nut is fitted is provided on the inner surface of the casing facing the nut, and a spring member that normally separates the nut from the nut hole is provided.

  According to the first invention, the contact pressure of the elastic body with respect to the casing can be adjusted only by tightening or loosening the nut, but the adjustment of the contact pressure is the adjustment of the damping force. Therefore, as a configuration thereof, it is possible to adjust the damping force with a simple configuration in which clamping members are provided on both sides of the elastic body and nuts for tightening the clamping members are provided.

The second invention can be applied to a cylinder that reciprocates.
According to the third invention, when the nut is inserted into the nut hole and the piston rod is rotated, the nut is tightened or loosened with the rotation. That is, since the damping force can be adjusted by simply turning the piston rod, the adjustment work becomes extremely simple.

According to the fourth invention, it can be applied to a rotary damper.
According to the fifth invention, when the nut is inserted into the nut hole and the rotating shaft is rotated, the nut is tightened or loosened with the rotation. That is, the damping force can be adjusted simply by turning the rotating shaft, and the adjustment work becomes extremely simple.

  The first embodiment shown in FIG. 1 is a direct-acting damper. A cylinder C as a casing of the present invention covers both ends of the cylinder tube 1 with covers 2 and 3, and the cylinder tube 1 includes the cylinder C 1 of the present invention. A piston 4 which is an elastic body is slidably incorporated. The piston 4 is made of a silicone rubber material and has elasticity. The piston 4 is penetrated by a piston rod 5 as a shaft of the present invention, one end of which protrudes outward of the piston 4 and the other end protrudes outward of the cover 3. .

The piston rod 5 has a threaded portion 5a formed in a portion penetrating the piston 4, and a stopper portion 5b formed of a stepped portion on the proximal end side of the threaded portion 5a.
The piston rod 5 configured as described above first penetrates one clamping member 6 made of a washer, and abuts the clamping member 6 against the stopper portion 5b. Next, the piston 4 is fitted, the other clamping member 7 is fitted from the outside of the piston 4, and a hexagon nut 8 is fitted to the outside of the other clamping member 7. In this state where the hexagon nut 8 is fitted, the tip of the piston rod 5 protrudes outward from the hexagon nut 8 so as to constitute a protruding end 5c.

  On the other hand, the cover 2 has a rod entry hole 2a at the center thereof and a hexagonal nut hole 2b into which the hexagon nut 8 enters adjacent to the rod entry hole 2a. It opens to the tube 1 side. The rod entry hole 2a thus configured has a diameter and depth sufficient for the protruding end 5c of the piston rod 5 to enter, and the nut hole 2b has the hexagon nut 8 and the relative shape thereof matched. Therefore, the hexagon nut 8 is sized to fit perfectly. Note that the fact that the hex nut 8 and the nut hole 2b fit together means that when the piston rod 5 is rotated in a state where the hex nut 8 and the hex nut 8 are engaged, the hex nut 8 fits to the extent that the hex nut 8 can rotate relative to the piston rod 5. To do.

  If the hexagon nut 8 rotates relative to the piston rod 5 as described above, the hexagon nut 8 advances along the screw portion 5a in the axial direction, but the advance direction reduces the facing distance L between the both clamping members 6 and 7. When it is in the direction, the piston 4 made of an elastic body is compressed by both the clamping members 6 and 7 and expands its outer diameter. On the contrary, when the advancing direction of the hexagon nut 8 is the direction in which the facing interval L is increased, the piston 4 is reduced in diameter as compared with the state in which the outer diameter is expanded.

  The larger the amount of expansion of the outer diameter of the piston 4, the greater the contact pressure of the piston 4 with respect to the cylinder tube 1. If the contact pressure increases, the sliding resistance of the piston 4 also increases. The magnitude of the sliding resistance is the magnitude of the damping force.

  The cover 2 is formed with a flange 2c. A flange 9 is also fixed to the tip of the piston rod 5 that protrudes outward from the cylinder C. A suspension spring 10 is interposed between the flanges 2c and 9.

  In the above configuration, the piston rod 5 maintains the extended position by the spring force of the suspension spring 10. However, the state shown is in the contracted position. When a force in a direction for compressing the suspension spring 10 is applied to the piston rod 5 in the extended position, the piston 4 moves to the left in the drawing and becomes a contracted position. From this state, when the force in the compression direction is released, the piston 4 moves in the extension direction by the action of the suspension spring 10, and the contact pressure of the piston 4 against the cylinder tube 1 at this time acts as a damping force. .

  When adjusting the damping force of the cylinder 1, the piston 4 is moved against the spring force of the suspension spring 10, and the protruding end 5c of the piston rod 5 is advanced into the rod entry hole 2a. At this time, if the relative shapes of the hexagon nut 8 and the nut hole 2b do not match, the hexagon nut 8 does not enter the nut hole 2b. Therefore, in this case, the hexagon nut 8 is turned together with the piston rod 5 so that the relative shapes of the hexagon nut 8 and the nut hole 2b are matched.

  If the piston rod 5 is further pushed in with the relative shapes of the hexagonal nut 8 and the nut hole 2c matched as described above, the hexagonal nut 8 will fit snugly into the nut hole 2c. If the piston rod 5 is rotated in a state where both of them are fitted in this way, the hexagon nut 8 and the piston rod 5 rotate relative to each other, and the hexagon nut 8 advances through the screw portion 5a according to the direction of the relative rotation. Become. Then, as described above, if the advancing direction of the hexagon nut 8 is a direction in which the facing distance L between the pair of clamping members 6 and 7 is reduced, the piston 4 made of an elastic body is compressed between the clamping members 6 and 7. The outer diameter will be expanded. The greater the amount of expansion of the outer diameter of the piston 4, in other words, the greater the outer diameter of the piston, the greater the damping force.

Therefore, the damping force of the damper can be freely adjusted by adjusting the facing distance L between the clamping members 6 and 7 while relatively rotating the hex nut 8 and the piston rod 5.
In addition, in this 1st Embodiment, although the hexagon nut 8 is used, the shape of a nut does not need to be a hexagon. In short, when the piston rod 5 is rotated with the nut 8 inserted into the nut hole 2b, the nut 8 does not have to be rotated by the rotational force at that time, so long as the rotation of the nut 8 can be stopped. Good.

  The second embodiment shown in FIG. 2 is a rotary damper whose casing C is covered with a cover 11 at one opening. The casing C thus constructed incorporates the rotating body 12 which is an elastic body of the present invention, and the outer peripheral surface of the rotating body 12 is brought into contact with the inner surface of the casing C. In the second embodiment, the rotating body 12 is made of a silicon rubber material and has elasticity. The rotating body 12 is passed through the rotating shaft 13 as the shaft of the present invention, with one end protruding outward of the rotating body 12 and the other end protruding outward of the cover 11. ing.

The rotating shaft 13 has a threaded portion 13a formed in a portion that penetrates the rotating body 12, and a stopper portion 13b formed of a stepped portion on the proximal end side of the threaded portion 13a.
The rotating body 12 configured as described above first allows one clamping member 14 made of a washer to pass therethrough and causes the clamping member 14 to abut against the stopper portion 13b. Next, the rotating body 12 is fitted, the other holding member 15 is fitted from the outside of the rotating body 12, and a hexagon nut 16 is fitted to the outside of the other holding member 15. When the hexagon nut 16 is fitted in this way, the tip of the rotary shaft 13 protrudes outward from the hexagon nut 16 so as to constitute a protruding end 13c. Further, the one clamping member 14 is configured to rotate integrally with the rotary shaft 13, and the clamping member 14 is baked on the rotating body 12.

  On the other hand, on the surface of the casing C facing the hexagon nut 16, a rod entry hole 17 is formed in the center thereof, and a hexagonal nut hole 18 into which the hexagon nut 16 enters is adjacent to the rod entry hole 17. The nut hole 18 is opened in the casing C. The rod entry hole 17 thus configured has a diameter and a depth sufficient for the protruding end 13c of the rotary shaft 13 to enter, and the nut hole 18 matches the hex nut 16 with a relative shape, The hexagon nut 16 is sized to fit perfectly. Note that the hex nut 16 and the nut hole 18 are closely fitted to each other by rotating the rotating shaft 13 in a state where the hex nut 16 and the nut hole 18 are fitted, so that the hex nut 16 can be rotated relative to the rotating shaft 13. means.

  If the hexagon nut 16 rotates relative to the rotary shaft 13 as described above, the hexagon nut 16 advances in the screw portion 13a in the axial direction, but the advance direction reduces the facing distance L between the holding members 14 and 15. When rotating, the rotating body 12 made of an elastic body is compressed by both the clamping members 14 and 15 to expand its outer diameter. On the other hand, when the advancing direction of the hexagon nut 16 is a direction in which the facing interval L is increased, the rotating body 12 is reduced in diameter as compared with the state in which the outer diameter is expanded.

  And the contact pressure of the rotary body 12 with respect to the casing C becomes large, so that the expansion amount of the outer diameter of the rotary body 12 is large. When the contact pressure increases, the sliding resistance of the rotating body 12 also increases. The magnitude of the sliding resistance is the magnitude of the damping force (torque).

  In the rotating body 12 as described above, the spring force of the spring member 19 is applied to the surface facing the nut hole 18, and the hexagon nut 16 is normally separated from the nut hole 18. Therefore, if the rotating shaft 13 is moved in the axial direction against the spring force of the spring member 19 and the rotating shaft 13 is rotated with the hexagon nut 16 inserted into the nut hole 18, the hexagon nut 16 is moved. The rotating body 12 is compressed. If the pushing force of the rotating shaft 13 is released, the hexagonal nut 16 is automatically pulled out from the nut hole 18 by the spring force of the spring member 19.

  Note that if the rotating body 12 and the rotating shaft 13 are simply relatively rotated, the contact pressure of the rotating body 13 with respect to the casing C is reduced. Therefore, in the above-described embodiment, the one clamping member 14 is configured to rotate integrally with the rotary shaft 13 and the clamping member 14 is baked on the rotating body 12. However, when it is not sufficient to bake the holding member 14 on the rotating body 12, for example, a flange may be provided on the rotating shaft 13 and the flange may be embedded in the rotating body 12 while baking the flange on the rotating body 12.

  The damper of the present invention exhibits a greater effect in a field where the load is not so large.

It is sectional drawing of 1st Embodiment. It is sectional drawing of 2nd Embodiment.

Explanation of symbols

C Cylinder 2b Nut hole 4 Elastic piston 5 Shaft piston rod 6, 7 Holding member 8 Nut C Casing 12 Elastic rotating body 13 Shaft Rotating shaft 14, 15 Holding member 16 Nut 18 Nut hole

Claims (5)

  An elastic body that exerts contact pressure on the casing is incorporated in the casing, and the shaft is penetrated through the elastic body, and clamping members are provided on both sides of the elastic body, and the shaft on at least one side surface of the clamping member is provided on the shaft. A damping force adjusting type damper configured to control a contact pressure of an elastic body with respect to a casing by fitting a nut and rotating the nut to adjust a facing distance between the holding members.   2. A damping force adjusting damper according to claim 1, wherein a piston, which is an elastic body, is incorporated in a cylinder, which is a casing, and a piston rod as a shaft is passed through the piston, and a nut is fitted to a penetrating end of the piston rod.   The damping force adjusting damper according to claim 2, wherein a nut hole into which a nut is fitted at a stroke end of the piston is provided at a cylinder end.   The damping force adjusting damper according to claim 1, wherein a rotating body as an elastic body is incorporated in the casing, a rotating shaft as a shaft is passed through the rotating body, and a nut is fitted to a through end of the rotating shaft.   5. A damping force adjusting damper according to claim 4, wherein a nut hole into which the nut is fitted is provided on the inner surface of the casing facing the nut, and a spring member is usually provided to separate the nut from the nut hole.

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