Anti-vibration device

Abstract

To provide a vibration isolator whose vibration isolation force is not restricted by an adhesion length of an elastic member.SOLUTION: A vibration isolator S includes a base member, a movable member 2 disposed above the base member, a support part 3 for supporting the movable member 2 slidably in a horizontal direction, a connection part 4, a plurality of elastic members 7, and a plurality of convex parts 5. The connection part 4 is fixed to the upper surface center of the base member 1. Each of the elastic members 7 is arranged radially in the horizontal direction from the connection part 4 with an interval from another elastic member 7, with one end connected to the connection part 4 and the other end connected to an undersurface side of the movable member 2. Each of the convex parts 5 protrudes in a vertical direction, and is provided between the one end and the other end of the elastic member 7 on the undersurface side of the movable member 2. One or both of the one end and the other end of the elastic member 7 are connected rotatably in the horizontal direction. The elastic member 7 comes in contact with the convex part 5 in the horizontal direction, and is bent in the horizontal direction beforehand.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vibration isolation device that utilizes an elastic member. [Background technology]

[0002] In recent years, robots that can autonomously collect tableware and other items have been developed, as described in Patent Document 1. Since the items transported by such robots include fragile items and containers containing liquids, it is necessary to reduce vibrations during transportation.

[0003] Therefore, for example, Patent Document 2 discloses a vibration-damping device that damps vibrations during transportation. This vibration-damping device includes a base member, a movable member, multiple rolling elements, and multiple coil springs. The rolling elements are disposed between the base member and the movable member and slide the movable member horizontally to damp horizontal vibrations and shocks. The multiple coil springs are connected to the base member and the movable member and, by their elastic force, dampen vibrations and shocks and return the sliding movable member to its original position.

[0004] The above-mentioned vibration-damping device can dampen greater vibrations the longer the sliding distance of the movable member. However, in this vibration-damping device, the movable range of the movable member in the axial direction of the coil spring is limited to the full length of the coil spring, so the sliding distance of the movable member is shortened by the full length of the coil spring, thereby limiting the magnitude of vibration that can be damped. In other words, the vibration-damping force of the above-mentioned vibration-damping device is limited by the full length of the coil spring. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2021-134082 [Patent Document 2] Japanese Patent Application Publication No. 9-370 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, an object of the present invention is to provide a vibration-isolating device whose vibration-isolating force is not limited by the contact length of the elastic member. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides an anti-vibration device comprising: a base member extending horizontally; a movable member extending horizontally and disposed above the base member; a support portion disposed between the base member and the movable member and supporting the movable member so as to be horizontally slidable; a connecting portion fixed to the center of the upper surface of the base member and spaced from the lower surface of the movable member; a plurality of elastic members that are axially expandable and horizontally bendable, the elastic members being arranged radially from the connecting portion and spaced from the other elastic members, with one end connected to the connecting portion and the other end connected to the lower surface of the movable member; and a plurality of convex portions that protrude vertically and are provided between one end and the other end of each elastic member on the lower surface of the movable member. One or both of the one and other ends of each elastic member are connected to be horizontally rotatable, and each elastic member is in horizontal contact with the convex portion and is pre-bent horizontally.

[0008] In order to solve the above problems, another configuration of the vibration-damping device of the present invention includes a base member extending horizontally, a movable member extending horizontally and arranged above the base member, a support section arranged between the base member and the movable member and supporting the movable member so that it can slide horizontally, a connecting section fixed to the center of the upper surface of the base member and spaced from the underside of the movable member, a plurality of elastic members that are axially expandable and horizontally bendable, the elastic members being arranged horizontally radially from the connecting section and spaced from the other elastic members, one end connected to the connecting section and the other end connected to the underside of the movable member, and a plurality of convex sections that protrude vertically and are respectively provided between one end and the other end of each elastic member on the underside of the connecting section. One or both of one end and the other end of each elastic member are connected to be rotatable horizontally, and each elastic member is in horizontal contact with the convex section and is pre-bent horizontally.

[0009] In the vibration isolation device, the plurality of elastic members are preferably configured by coil springs.

[0010] In the vibration isolation device, the plurality of elastic members are preferably all bent in the same direction.

[0011] In the vibration-damping device, the connecting portion preferably has a cushioning material that covers the periphery of the connecting portion in the horizontal direction.

[0012] In the vibration-damping device, the plurality of protrusions are preferably configured to be movable in a direction perpendicular to the axial direction of the elastic member. [Effects of the Invention]

[0013] In the vibration-isolating device of the present invention, the elastic members are bent in advance and therefore do not receive load in the axial direction, so the vibration-isolating force is not limited by the contact length of the elastic members. [Brief explanation of the drawings]

[0014] [Figure 1]1A and 1B show a vibration isolation device according to one embodiment of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a side view. [Figure 2] FIG. 1B is a cross-sectional view of FIG. [Figure 3] 1 and 2, and B is an enlarged view of part B in A. [Figure 4] 10A and 10B are diagrams illustrating the movement of the vibration isolation device. [Figure 5] FIG. 10 is a diagram showing a modified example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an anti-vibration device according to one embodiment of the present invention will be described with reference to the accompanying drawings. In the drawings, double-headed arrows X, Y, and Z indicate the left-right direction, the front-rear direction, and the up-down direction, respectively, and are perpendicular to each other.

[0016] Fig. 1 shows an anti-vibration device S according to one embodiment of the present invention, with Fig. 1A being a plan view and Fig. 1B being a side view. Fig. 2 is a cross-sectional view taken along line aa in Fig. 1. Fig. 3 is a cross-sectional view taken along line bb in Figs. 1 and 2.

[0017] 1 and 2, the vibration-damping device S includes a base member 1, a movable member 2, six support parts 3, a connecting part 4, six protrusions 5, and six coil springs 7. Note that the numbers of support parts 3, protrusions 5, and coil springs 7 are just an example, and the vibration-damping device of the present invention is not limited to this.

[0018] The base member 1 is made of resin and is composed of a horizontally extending plate. The base member 1 has a circular outer shape. These are merely examples, and the base member 1 of the present invention is not limited to these. For example, the base member 1 may be made of metal and may have a polygonal outer shape.

[0019] The movable member 2 is made of resin, extends horizontally, and has a circular outer shape. The top surface of the movable member 2 is flat so that an object to be vibration-damped can be placed on it. As shown in Figures 2 and 3, the lower side of the movable member 2 has a circular recess 2a in the center that is recessed in the vertical direction. The movable member 2 of the present invention may be made of metal, for example, and may have a polygonal outer shape.

[0020] The movable member 2 further has six locking portions 21 on the lower side thereof. The locking portions 21 extend in the vertical direction and are arranged at intervals from one another along the circumferential direction of the movable member 2.

[0021] 1, the movable member 2 has a mark 22 on its side surface. The mark 22 is configured to indicate the position of a coil spring 7, which will be described later.

[0022] The support parts 3 are made of metal spheres. The six support parts 3 are arranged in a circle at intervals in the horizontal direction between the base member 1 and the movable member 2. The support parts 3 are so-called ball bearings, and are rotatably fitted into a metal ring provided on the underside of the movable member 2. As a result, the multiple support parts 3 support the movable member 2 on the upper surface of the base member 1 so that it can slide horizontally. Therefore, the movable member 2 can absorb vibrations and impacts by sliding.

[0023] The connecting part 4 is made of resin and is configured as a substantially circular plate extending horizontally. As shown in Fig. 3, the connecting part 4 is fixed to the base member 1 with a flat head screw at the center of the upper surface of the base member 1, with a gap between the upper surface of the movable member 2 and the base member 1.

[0024] The connecting portion 4 has a cushioning material 40 that covers the horizontal periphery of the connecting portion 4. If the inner wall of the recess 2a collides with the connecting portion 4, the cushioning material 40 can absorb the impact. The cushioning material 40 may be made of, for example, a rubber material, or may be formed into a sponge-like material. The material and shape of the cushioning material 40 are not particularly limited.

[0025] The connecting portion 4 further has six locking portions 41 on the lower side thereof. The locking portions 41 extend in the vertical direction and are arranged at intervals from one another along the circumferential direction of the connecting portion 4.

[0026] The protrusions 5 protrude downward and are arranged around the recess 2a so as to surround the recess 2a. The protrusions 5 are formed integrally with the movable member 2, but this is merely an example and they may be configured separately. One protrusion 5 is arranged between each support portion 3, and on both sides thereof, an insertion hole 6 into which a bit can be inserted is provided. In this embodiment, by inserting a bit, the bit can be further added as a protrusion 5.

[0027] The six coil springs 7 are arranged radially in the horizontal direction from the connecting portion 4 at intervals from one another, with first ends 7a connected to the locking portion 21 and second ends 7b connected to the locking portion 41. This allows the coil springs 7 to return the sliding movable member 2 to its original position by their elastic force.

[0028] Furthermore, the first end 7a of the coil spring 7 is connected to the locking portion 21 so as to be rotatable in the horizontal direction, and the second end 7b is connected to the locking portion 41 so as to be rotatable in the horizontal direction. Furthermore, the coil spring 7 is in horizontal contact with the protrusion 5 and is bent in advance in the horizontal direction. As a result, the coil spring 7 is not subjected to a load in the axial direction, and can bend without causing buckling, allowing the movable member 2 to slide smoothly.

[0029] 3, the coil spring 7 is positioned lower than the other components except for the locking portion 21, the locking portion 41, the protrusion 5, and the support portion 3, and does not come into contact with anything when bending. In other words, the vibration-damping device S has a space for bending the coil spring 7, so that the first and second ends 7a, 7b of the coil spring 7 can rotate freely, as shown in FIG. 4. In the configuration of this embodiment, the first end 7a of the coil spring 7 can rotate up to approximately 80 degrees with respect to the axis connecting the first end 7a and the second end 7b.

[0030] In this embodiment, regardless of the direction in which the bending direction of the end of the coil spring 7 is set, the coil springs 7 will not come into contact with adjacent coil springs 7. However, for example, when using thick coil springs 7 or when constructing a more compact vibration-damping device S, it is possible to prevent adjacent coil springs 7 from coming into contact with each other by setting the bending directions of multiple coil springs 7 to the same direction (see Figure 5).

[0031] With the above configuration, when vibration or impact occurs, the vibration-damping device S can freely slide the movable member 2 horizontally using the support part 3 to absorb the vibration or impact, and the sliding movable member 2 can be gently returned to its original position using the coil spring 7. Furthermore, the vibration-damping device S can also increase the elasticity of the coil spring 7 by inserting a bit into the insertion hole 6 to add a protrusion 5, and then contacting the coil spring 7 with this added protrusion 5 in the horizontal direction to bend it. Furthermore, by placing the vibration-damping device S in a predetermined direction based on the mark 22 and the environment in which it is installed, the direction of the elastic force of the coil spring 7 can be determined, allowing the vibration-damping device S to exert its vibration-damping force more effectively. This is particularly effective when the number of coil springs 7 is small.

[0032] In addition, in the above explanation, the vibration-damping device S is described as being arranged with the movable member 2 on the upper side and the base member 1 on the lower side, but it can still function as a vibration-damping device even if it is arranged upside down.

[0033] Furthermore, multiple vibration isolation devices S may be placed under one object to be vibration-isolated. In this case, the orientations of the multiple vibration isolation devices S may be the same or different from each other. For example, the vibration isolation devices S may be placed in the same direction or in different directions based on the mark 22, thereby more effectively exerting vibration isolation power.

[0034] Although the vibration control device S according to one embodiment of the present invention has been described above, the vibration control device of the present invention is not limited to the above embodiment. The vibration control device S of the present invention may be configured, for example, in the following modified examples.

[0035] There are no particular limitations on the shapes of the base member 1 and the movable member 2. For example, the base member 1 and the movable member 2 may be formed in a frame shape.

[0036] The support portion 3 may be provided on either the base member 1 or the movable member 2, as long as it can support the movable member 2 so that it can slide horizontally. Furthermore, the support portion 3 is not limited to a ball bearing. For example, the support portion 3 may be configured with a roller if the sliding direction of the movable member 2 is limited to one direction.

[0037] The elastic member of the present invention is not limited to the coil spring 7. For example, the elastic member may be a wave-shaped leaf spring or a bellows-shaped elastic member, as long as it is an elastic member that can expand and contract in the axial direction and bend in the horizontal direction.

[0038] The protrusions 5 may be formed of bolts, for example, as shown in Fig. 5. In this case, the vibration-damping device S has holes 8 extending in the circumferential direction on the underside of the movable member 2, and the protrusions 5 are fixed to the holes 8 with nuts, thereby allowing the protrusions 5 to move in a direction perpendicular to the axial direction of the elastic member. This allows the vibration-damping device S to adjust the elastic force of the elastic member.

[0039] The plurality of protrusions 5 may be provided, for example, on the connecting portion 4, and in this case, the elastic member is bent in advance by the protrusions 5 provided on the connecting portion 4. Also, some of the plurality of protrusions 5 may be provided on the connecting portion 4, and the other protrusions 5 may be provided on the movable member 2.

[0040] As long as the coil spring 7 can be bent without buckling, it is sufficient that either the first end 7a or the second end 7b of the coil spring 7 is connected so as to be rotatable in the horizontal direction; it is not necessary that both the first end 7a and the second end 7b are connected so as to be rotatable in the horizontal direction. [Explanation of symbols]

[0041] S vibration isolation device 1 Base material 2. Movable parts 2a Recess 21 Locking portion 22 marks 3 Support part 4 Connecting part 40 Cushioning material 41 Locking part 5 Convex part 6 Insertion hole 7 Coil spring (elastic member) 7a 1st end 7b 2nd end 8 holes

Claims

1. a base member extending horizontally; a movable member extending horizontally and disposed above the base member; a support portion disposed between the base member and the movable member and supporting the movable member so as to be slidable in a horizontal direction; a connecting portion fixed to the center of the upper surface of the base member at a distance from the lower surface of the movable member; a plurality of elastic members that are axially expandable and horizontally bendable, the elastic members being arranged radially in the horizontal direction from the connecting portion at intervals from other elastic members, one end of the elastic members being connected to the connecting portion and the other end of the elastic members being connected to the lower surface side of the movable member; a plurality of convex portions that protrude in the up-down direction and are provided on the lower surface side of the movable member between one end and the other end of each of the elastic members, One end and / or the other end of each of the elastic members is connected to be pivotable in a horizontal direction, A vibration-damping device, wherein each of the elastic members is in horizontal contact with the convex portion and is bent in advance in the horizontal direction.

2. a base member extending horizontally; a movable member extending horizontally and disposed above the base member; a support portion disposed between the base member and the movable member and supporting the movable member so as to be slidable in a horizontal direction; a connecting portion fixed to the center of the upper surface of the base member at a distance from the lower surface of the movable member; a plurality of elastic members that are axially expandable and horizontally bendable, the elastic members being arranged radially in the horizontal direction from the connecting portion at intervals from other elastic members, one end of the elastic members being connected to the connecting portion and the other end of the elastic members being connected to the lower surface side of the movable member; a plurality of convex portions that protrude in the up-down direction and are provided on the lower surface side of the connecting portion between one end and the other end of each of the elastic members; One end and / or the other end of each of the elastic members is connected to be pivotable in a horizontal direction, A vibration-damping device, wherein each of the elastic members is in horizontal contact with the convex portion and is bent in advance in the horizontal direction.

3. 3. The vibration isolation device according to claim 1, wherein the plurality of elastic members are formed of coil springs.

4. 3. The vibration isolation device according to claim 1, wherein all of the plurality of elastic members are bent in the same direction.

5. The vibration-damping device according to claim 1 or 2, wherein the connecting portion has a cushioning material that covers the periphery of the connecting portion in the horizontal direction.

6. 3. The vibration-damping device according to claim 1, wherein the plurality of protrusions are configured to be movable in a direction perpendicular to the axial direction of the elastic member.

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