JPH0854041A - Surging preventing member for compression coil spring, and vibration control device - Google Patents

Abstract

PURPOSE:To perform proper suppression of surging according to the wire diameter of a compression coil spring so that a surging preventing member is prevented from movement following expansion and contraction of the compression coil spring. CONSTITUTION:A surging preventing member for a compression coil spring comprises a cylinder part 2a disposed on the inner periphery of a compression coil spring 1 for carrying a load; an engaging flange part 2b protruded from one end of the cylinder part 2a and engaged with one end of the compression coil spring 1; and a viscoelastic piece 2c protruded from the outer peripheral surface of the cylinder part 2a and making contact with the compression coil spring 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surging prevention member for a compression coil spring used in a vibration isolator and a vibration isolator using the surging prevention member.

[0002]

2. Description of the Related Art As shown in FIG. 8, a conventional anti-surging device has a hollow portion of a compression coil spring (1 ') and a spring when the compression coil spring (1') is most compressed in a used state. In the direction in which both ends in the length direction are abutted against each other, a surging prevention member (2 ') composed of a metal elastic contact plate that is corrugated in the length direction on an elongated spring plate narrower than the length It has a structure in which it is bent into a cylindrical shape and fitted concentrically, and the surging prevention member (2 ') is elastically blasted to the inner surface of the compression coil spring (1') by its diametrical expansion restoring force. It was

According to this, when the compression coil spring (1 ') is installed vertically and the load (20') is operated to expand and contract the compression coil spring (1 '), the lower end of the surging prevention member (2') is removed. The compression coil spring (1 ') is not engaged with the lower end of the compression coil spring (1'), and the surging prevention member (2 ') is simply elastically contacting the inner circumference of the compression coil spring (1'). Repeatedly expanding and contracting, the surging prevention member (2 ')
Gradually rises up, and finally comes into contact with the load (20 ') and the compression coil spring (1') expands and contracts to prevent surging.
(2 ') will go up and down.

Since the surging preventing member (2 ') having a small internal damping such as a metal elastic contact plate is used, the surging suppressing effect is small.

The surging prevention member (2 ') is formed by rolling the elastic plate and inserting it into the compression coil spring (1').
Even if the wire diameter of the compression coil spring (1 ') is changed to change the spring constant, the diameter of the compression coil spring (1') will expand or contract according to the change of the inner diameter of the compression coil spring (1 '). The contact area of ') to the compression coil spring (1') becomes constant, and the contact area increases when the wire diameter becomes thicker, and conversely, the contact area decreases when the wire diameter becomes thinner, and the surging suppression force is changed appropriately. There was a problem such as not being able to do it.

[0006]

An object of the present invention is to prevent the surging preventing member from moving in accordance with expansion and contraction of the compression coil spring, and to appropriately suppress surging in accordance with the wire diameter of the compression coil spring. Is to do.

[0007]

A surging prevention member (2) according to claim 1 is a "cylindrical portion (2a) disposed on the inner circumference of a compression coil spring (1) for carrying a load, and the tubular portion". (2a) is provided so as to project from one end, the engaging flange portion (2b) that engages with one end of the compression coil spring (1), and the projection provided on the outer peripheral surface of the tubular portion (2a), It is composed of a viscoelastic piece (2c) in contact with the coil spring (1) '.

According to this, since the viscoelastic piece (2c) is in contact with the compression coil spring (1), the vibration of the load transmitted through the upper mount (20) and the lower mount (21) are transmitted. The surging of the compression coil spring (1) caused by the externally transmitted disturbance vibration is absorbed by the internal damping of the viscoelastic piece (2c), and the surging of the compression coil spring (1) is suppressed. On the other hand, viscoelastic pieces
Since (2c) is simply in contact with the compression coil spring (1), expansion and contraction of the compression coil spring (1) is not hindered, and the spring characteristics of the compression coil spring (1) are exhibited as they are. Become. Further, since the engaging flange portion (2b) is engaged with one end of the compression coil spring (1), the surging prevention member (2) does not slide up regardless of expansion and contraction of the compression coil spring (1). .

The second aspect is another embodiment of the surging preventing member (2) (see FIG. 7) for contacting the compression coil spring (1) from the outside to suppress surging. A tubular portion (2a) arranged on the outer periphery of the coil spring (1),
An engagement flange portion (2b) that is provided so as to project from one end of the tubular portion (2a) and engages with one end of the compression coil spring (1), and a tubular portion (2a).
Of the viscoelastic piece (2c) which is provided on the inner peripheral surface of the projection and is in contact with the compression coil spring (1) '. .

A fourth aspect of the present invention is to provide a vibration damping device (A1) (A2) which uses a surging preventing member (2) of a compression coil spring (1).
In the embodiment, "load-carrying compression coil spring (1), a cylinder portion (2a) disposed on the inner circumference of the compression coil spring (1), the cylinder portion (2a) is projected from one end, A viscoelastic piece (2c) that is in contact with the compression coil spring (1) and is provided so as to protrude from the outer peripheral surface of the engagement flange portion (2b) and the tubular portion (2a) that engage with one end of the compression coil spring (1). Surging prevention member composed of
(2), composed of an upper cap (3) that covers the compression coil spring (1) from above and stores the upper part of the compression coil spring (1), and a lower storage case (9) that stores the lower part of the compression coil spring (1). By using a surging prevention member (2) with a viscoelastic piece (2c), surging can be performed without impairing the spring characteristics of the compression coil spring (1) for load carrying. Can be suppressed.

A fifth aspect of the present invention is a modification of the first embodiment of the vibration isolator (A1) (see FIG. 7).
(1), a cylinder portion (2a) arranged on the outer periphery of the compression coil spring (1), and a protrusion projecting from one end of the cylinder portion (2a), engaging with one end of the compression coil spring (1) The engaging flange portion (2b) and the cylindrical portion (2a) are provided so as to project from the inner peripheral surface of the compression coil spring.
A surging prevention member (2) composed of a viscoelastic piece (2c) that comes into contact with (1), an upper cap (3) that covers the compression coil spring (1) from above and stores the upper part of the compression coil spring (1). ,
Lower storage case (9) for storing the lower part of the compression coil spring (1)
It is composed of and, and achieves the same operation as the previous section.

[0012] Claim 3 or 6 defines the viscoelastic piece (2c). "The diameter of the compression coil spring (1) for carrying the load, the diameter of the tubular portion (2a) and the width of the viscoelastic piece (2c). By making the value of the compression coil spring (1) constant, the contact amount of the viscoelastic piece (2c) with the compression coil spring (1) changes according to the change in the wire diameter of the compression coil spring (1). As a result, the internal damping amount can be adjusted according to the change in the wire diameter of the compression coil spring (1).

[0013]

The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a cross-sectional view of a first embodiment of a vibration isolator (A1) according to the present invention, in which a lower storage case (9) having an upper opening is covered with an upper cap (3) having a lower opening, and a compression coil spring is provided inside. (1) is stored. An inner cylinder supporting cylinder part (10) is provided so as to project from the center of the lower storage case (9), and an engaging inner collar part (11) is formed on the inner periphery of the upper part of the inner cylinder supporting cylinder part (10). ing. On the inner circumference of the outer cup part (12) of the lower storage case (9), lower positioning projections (9a) are vertically projected at regular intervals, and the lower outer circumference of the compression coil spring (1) is positioned almost at the lower position. It is designed to fit in the ridge (9a).

The surging prevention member (2) has a cylindrical tubular portion.
(2a), an engaging flange portion (2b) protruding in the outer peripheral direction at the lower end of the cylindrical portion (2a), and a plurality of viscoelastic pieces protruding in the vertical direction on the outer peripheral surface of the cylindrical portion (2a). (2c) and. Viscoelastic piece (2c)
In the embodiment shown in FIG. 3, the number of protruding portions is 4 at 90 ° intervals, but it is not limited to this, and may be 3 or 4 or more.

In this embodiment, the surging prevention member (2) is entirely made of a viscoelastic member (trade name: Hanenite, shock vibration absorption,
A highly damped damping rubber with excellent internal damping, a special rubber that absorbs energy with almost no repulsion even when subjected to external force. ), But is not limited to this, of course
(2a) only or the tubular portion (2a) and the engaging brim portion (2b) is a metal member such as iron or brass, the viscoelastic piece (2c) having a small spring constant is integrally formed from the tubular portion (2a). You may project. If the engaging collar portion (2b) is made of a viscoelastic member, it is possible to insulate the lower storage case (9) from the compression coil spring (1), which is more preferable. It should be noted that the viscoelastic member is not limited to a member such as the above-mentioned "Hanenaito", but a low repulsive rubber (a material having a small elasticity but a restoring force that returns to its original shape).
Needless to say, it may be something like.

The height of the surging prevention member (2) is smaller than the minimum size when the compression coil spring (1) is compressed, and the inner cylinder support cylinder part (10) is inserted into the cylinder part (2a). Has been done. The engaging collar (2b) of the surging prevention member (2) is
The compression coil spring (1) is projected from the outer periphery of the lower end of (a).
Is engaged with the lower end of.

The upper cap (3) is fitted over the lower storage case (9), and the compression coil spring (1) is elastically contacted with the ceiling surface of the upper cap (3). A plurality of elastic hook arms (4) are provided so as to protrude downward at the center of the upper cap (3), and an engaging hook portion (5) is provided at the lower end on the inner peripheral side thereof.

The fall prevention member (16) is composed of a columnar portion (19), a conical head portion (17) and a lower end engaging flange portion (18), and a conical shape is formed at the upper end of the columnar portion (19). A head portion (17) is formed, and a lower end engaging collar portion (18) is formed at the lower end. Conical head (1
7) is an upper cap (3) composed of elastic hook arms (4)
Inserted in the recess (3a) located in the center of the conical head (17)
Engages with the engaging hook portion (5) and is suspended by the elastic hook arm (4). Conical head (17)
Is loaded via the upper cap (3), and when the compression coil spring (1) is bent, the lower end engaging flange (18) is located below the engaging inner flange (11). .

The upper pad (6) is disposed on the upper surface of the upper cap (3), and the upper insertion convex portion is projected from the lower end of the upper pad (6).
(7) said recess formed by elastic hook arms (4)
Fit in (3a). The tip of the upper insertion convex portion (7) is slightly separated from the conical head (17), and it is possible to swing the head when the conical head (17) is engaged with the engaging hook portion (5). Has become. Further, the upper pad (6) has an uneven surface (8) formed on its upper surface (contact surface with the upper pedestal (20)).

The lower pad (13) is disposed below the lower storage case (9) and is used. The lower pad (13) is placed in the inner cylinder supporting cylinder portion (10) of the lower storage case (9). The lower insertion convex portion (15) protruding from the central portion of () is fitted.
Further, hanging pieces (14) are hung from both sides of the lower pad (13) so as to sandwich the lower mount (21) from both sides as shown in FIG.

In this embodiment, the upper cap (3) and the lower storage case (9) are of constant dimensions regardless of the wire diameter of the compression coil spring (1). On the other hand, the wire diameter and the number of turns of the compression coil spring (1) are appropriately selected according to the load of the carried upper pedestal (20). (Of course, the wire diameter and number of turns of the compression coil spring (1) and its diameter are appropriately selected according to the load of the upper frame (20) to be carried, and the upper cap (3) and the lower storage case (9) are selected accordingly. It is possible to prepare, but in that case, it is necessary to prepare a large number of members with slightly different dimensions, which makes inventory management difficult.) Therefore, in this case, in principle, 1
The upper cap (3), the lower storage case (9), and the plural types of compression coil springs (1) will be prepared.

In the case of this embodiment, the compression coil spring (1)
The outer cup of the lower storage case (9) regardless of the size of
Since the inner diameter of (12) is constant, the outer dimensions of the compression coil spring (1) can be stored in the outer cup section (12) regardless of the change in the wire diameter of the outer coil section (12). It will be formed uniformly according to the part (12). Therefore, the thicker the wire diameter of the compression coil spring (1), the smaller the inner circumference of the compression coil spring (1).

On the other hand, the tubular portion (2a) of the surging prevention member (2)
Since the outer diameter (M) and the width (H) of the viscoelastic piece (2c) are constant, the larger the wire diameter of the compression coil spring (1), the smaller the inner diameter of the compression coil spring (1). As a result, the contact area between the viscoelastic piece (2c) and the compression coil spring (1) increases. Therefore, when the surging prevention member (2) is inserted into the compression coil spring (1), the viscoelastic piece (2c) comes into contact with the inner circumference of the compression coil spring (1) and bends.

Next, a method of assembling this embodiment will be described. First, insert the tubular portion (2a) of the surging prevention member (2) into the inner tubular support tubular portion (10) of the lower storage case (9), and then insert the compression coil spring (1) into the lower storage case (9). Then, the compression coil spring (1) is positioned by the lower positioning protrusion (9a). This causes the outer circumference of the compression coil spring (1) to approach the lower positioning ridge (9a) (non-contact)
(1) will be erected exactly in the center of the lower storage case (9). At this time, as described above, the viscoelastic piece (2c) comes into contact with the inner circumference of the compression coil spring (1) and is bent. The lower end of the stored compression coil spring (1) presses the engaging flange (2b) against the bottom surface of the lower storage case (9), and the engaging flange (2b).
Will be engaged and fixed by the lower end of the compression coil spring (1).

Subsequently, the fall prevention member (16) is inserted into the inner cylinder support cylinder portion (10), and the conical head portion (17) of the fall prevention member (16) is disengaged from the engaging inner flange portion (11). After that, place the lower pad (13) on the lower surface of the lower storage case (9) and insert the lower insertion convex part (15) into the inner cylinder support cylindrical part (10) to lower it. Secure the lower pad (13) to the bottom of the storage case (9).

Next, the upper cap (3) is fitted from above the lower storage case (9), and the compression coil spring (1) is compressed and flexed, as shown in FIG. 4, at the center of the elastic hook arm (4). Align the conical head (17) of the captive member (16) with the recess (3a) and push it in, insert the elastic hook arm (4) while bending it outward, and engage the conical head (17). To meet. Elastic hook arm
Since (4) has elasticity, when the conical head (17) passes through the engaging hook part (5), the conical head (17) naturally returns to its original position, and as shown by the phantom line in FIG. ) And the engaging hook portion (5) are engaged with each other. If you release your hand in this state, the compression coil spring
(1) is extended, and the lower end engaging flange portion (18) is engaged with the engaging inner flange portion (11).

Next, the upper pad (6) is placed on the upper surface of the upper cap (3), and the upper insertion convex portion (7) is inserted into the recess (3a) formed by the elastic hook arm (4). Cap the upper pad (6)
(3) Fix on the upper surface. In this way, the vibration damping device (A1) according to the present invention is assembled.

Next, the operation of this embodiment will be described. The anti-vibration device (A) according to the present invention is used by being disposed between the upper mount (20) and the lower mount (21) as shown in FIGS. The lower pad (13) is placed on the lower part, and the hanging pieces (14) sandwich the lower mount (21) from both sides. The upper pad (6) comes into contact with the lower surface of the upper mount (20) and carries the load applied to the upper mount (20).

When a load is applied, the compression coil spring (1) bends by a predetermined dimension, and the lower end engaging flange (18) of the drop-out preventing member (16) is below the engaging inner flange (11) as shown in FIG. It will be in the state of being separated. When a mechanical device on the upper pedestal (20) operates to transmit vibrations or disturbance vibrations from the floor are transmitted through the lower pedestal (21), the compression coil spring (1) expands and contracts in accordance with this vibration, Although the vibration is absorbed, since the vibration is composed of a wide range of frequencies, surging as shown in FIGS. 9 and 10, for example, occurs in a certain frequency range. Fig. 9 shows the vibration-damping characteristic curve when the wire diameter is small. The solid line (a) shows the vibration-damping characteristic when only the compression coil spring (1) is used without using the surging prevention member (2). Shows the anti-vibration characteristics when the surging prevention member (2) is used.
(C) is the vibration-proof characteristic curve of the conventional example.

According to FIG. 9, when the surging prevention member (2) is not used, five steep surging regions appear from the top to the bottom. However, if the surging prevention member (2) according to the present invention is used, As shown by the broken line (b), it can be seen that the surging up to is almost completely suppressed without substantially impairing the attenuation characteristics. Although the conventional example is also effective in suppressing surging, there is a problem that the attenuation characteristic curve moves to the right side in the figure as shown by hatching, and the attenuation characteristic deteriorates only in the hatched portion.

Even when the coil diameter of the compression coil spring (1) is large as shown in FIG. 10, the viscoelastic piece (2c) of the surging prevention member (2) and the compression coil spring (1) are brought into contact with each other in the present invention. Since the area is increased, the surging in the surging region having a peak of 310 hertz is almost suppressed, whereas the conventional example does not sufficiently suppress the surging and the surging is slightly suppressed. As described above, by using the surging prevention member (2) of the present invention, surging can be suppressed without substantially impairing the vibration damping characteristics of the compression coil spring (1). The surging prevention member (2) does not slide upward due to expansion and contraction of the compression coil spring (1) because the flange portion (2b) is engaged with the lower end of the compression coil spring (1). .

FIG. 6 shows a second embodiment of the vibration isolator (A2) according to the present invention. In this case, the fall prevention member (16) is not used and the upper spring projecting from the lower surface of the upper pad (6) is used. The upper end of the compression coil spring (1) fits into the fitting portion (6a). This allows the upper cap (3) and the lower storage case (9) to be fitted with their center lines aligned with each other with the upper spring fitting portion (6a) as a reference. The surging prevention member (2)
Alternatively, or together with the surging prevention member (2), a viscoelastic liquid (for example, silicone oil, agar-like gel) is provided in the space between the inner cylinder supporting cylinder part (10) and the outer cup part (12) of the lower storage case (9). (1) is stored in the viscoelastic liquid and the lower end of the compression coil spring (1) is immersed in the viscoelastic liquid to suppress the surging of the compression coil spring (1) by utilizing the internal friction damping of the viscoelastic liquid. Good.

FIG. 7 shows a modification of the first embodiment of the present invention in which the surging prevention member (2) is fitted from the outside of the compression coil spring (1).
The tubular portion (2a) of (2) is arranged on the outer periphery of the compression coil spring (1), and the engaging flange portion (2b) is provided so as to project from the lower end of the tubular portion (2a). It is adapted to engage with the lower end of the compression coil spring (1). Furthermore, the viscoelastic piece (2c) is
The compression coil spring (1) is protrudingly provided on the inner peripheral surface of a).
It comes in contact with the outer surface of. In this case, the compression coil spring (1) has a constant inner diameter, and a change in wire diameter appears as a change in outer diameter. This allows the viscoelastic piece
The contact pressure in (2c) changes.

According to the present invention, since the viscoelastic piece of the surging preventing member is in contact with the compression coil spring, the surging is effectively absorbed by the internal damping of the viscoelastic piece without impairing the spring characteristics of the compression coil spring. There is an advantage that it can be done, further, since the engaging collar portion is engaged with one end of the compression coil spring, regardless of expansion and contraction of the compression coil spring,
There is an advantage that the surging prevention member does not go up and is held at a predetermined position.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a first embodiment of a vibration isolator according to the present invention.

FIG. 2 is a front view of a vibration damping device according to the present invention.

FIG. 3 is a plan sectional view of FIG.

FIG. 4 is a cross-sectional view for explaining a state in the case where the fall prevention member according to the present invention is elastically engaged with the elastic hook arm.

FIG. 5 is a perspective view of a surging prevention member used in the present invention.

FIG. 6 is a vertical sectional view of a second embodiment of the vibration isolator according to the present invention.

FIG. 7 is a vertical sectional view of another example of the first embodiment of the vibration isolator according to the present invention.

FIG. 8 is a sectional view of a conventional example.

FIG. 9 is a perspective view of a surging prevention member used in a conventional example.

FIG. 10 is a damping characteristic curve when a small diameter compression coil spring is used.

FIG. 11 is a damping characteristic curve when a large-diameter compression coil spring is used.

[Explanation of symbols]

 (1)… Compression coil spring (2)… Surging prevention member (2a)… Cylinder part (2b)… Engagement collar part (2c)… Viscoelastic piece (3)… Upper cap (3a)… Lower positioning ridge (4) )… Elastic hook arm (5)… Engagement hook part (6)… Upper pad (6a)… Upper spring fitting part (7)… Upper insertion convex part (8)… Uneven part (9)… Lower storage case

Claims (6)

[Claims] 1. A cylindrical portion disposed on the inner circumference of a load-carrying compression coil spring, and an engagement flange portion projecting from one end of the cylindrical portion and engaging with one end of the compression coil spring, A surging preventing member for a compression coil spring, which is formed by a viscoelastic piece that is provided so as to project from the outer peripheral surface of the cylindrical portion and is in contact with the compression coil spring. 2. A cylinder portion arranged on the outer periphery of a load-carrying compression coil spring, an engagement flange portion projecting from one end of the cylinder portion and engaging with one end of the compression coil spring, and a cylinder. A surging preventing member for a compression coil spring, which is formed of a viscoelastic piece that is provided so as to project from the inner peripheral surface of the portion and is in contact with the compression coil spring. 3. The diameter of the compression coil spring for carrying the load, the diameter of the tubular portion, and the width of the viscoelastic piece are made constant, so that the compression coil spring of the viscoelastic piece and The surging preventing member for a compression coil spring according to claim 1, wherein the contact amount is changed. 4. A load-carrying compression coil spring, a cylinder portion disposed on the inner circumference of the compression coil spring, and an engagement projecting from one end of the cylinder portion and engaging with one end of the compression coil spring. A collar and a surging prevention member that is provided on the outer peripheral surface of the cylindrical portion and is composed of a viscoelastic piece that contacts the compression coil spring, an upper cap that covers the compression coil spring from above, and stores the upper part of the compression coil spring. , A lower storage case that stores the lower portion of the compression coil spring. 5. A compression coil spring for carrying a load, a cylindrical portion arranged on the outer periphery of the compression coil spring, and an engagement brim protruding from one end of the cylindrical portion and engaging with one end of the compression coil spring. Portion, a surging prevention member that is provided on the inner peripheral surface of the cylindrical portion and is configured with a viscoelastic piece that contacts the compression coil spring, an upper cap that covers the compression coil spring from above, and stores the upper portion of the compression coil spring. , A lower storage case that stores the lower portion of the compression coil spring. 6. The diameter of the load-carrying compression coil spring, the diameter of the cylindrical portion, and the width of the viscoelastic piece are made constant so that the viscoelastic piece comes into contact with the compression coil spring according to the change in the wire diameter of the compression coil spring. The vibration control device according to claim 4, wherein the amount is changed.