JP4584022B2 - Buffer structure - Google Patents

Description

  The present invention relates to a buffer structure, and more particularly to a buffer structure used in a space or the like, and applied to a device using a component that is extremely weak against vibration and shock, such as a mechanical relay or a crystal oscillator.

  Conventionally, in order to obtain an excellent buffering characteristic and to optimize the buffering characteristic in the above-described buffering structure used in outer space or the like, for example, a buffering structure as shown in FIGS. Proposed.

  As shown in FIG. 6, the buffer structure is configured to fix the fixed portion 21 with O-ring holders 19 and 20 via O-rings 17 and 18, and the O-ring holders 19 and 20 include fixing screws 22. Is fixed to the mounting base 23. Two O-rings 17, 18 are arranged in the gap between the O-ring holders 19, 20 and the fixed part 21, respectively, and relieve vibration / impact applied to the fixed part 21 from the outside.

  As shown in FIG. 7, when an axial vibration / impact of the fixing screw 22 is applied to the fixed portion 21 from the outside, the O-ring 17 relaxes the vibration / impact, and as shown in FIG. When vibration / impact in a direction perpendicular to the axial direction of the fixing screw 22 is applied to the fixing portion 21 from the outside, the O-ring 18 reduces the vibration / impact. Further, external forces such as vibrations and shocks oblique to the fixing screw 22 can be buffered by a combination of these O-rings 17 and 18.

  Here, the relationship of (thickness of the O-rings 17 and 18> gap between the O-ring holders 19 and 20 and the fixed portion 21) is established, and the buffering performance of the O-rings 17 and 18 is as follows. And the thickness of the O-rings 17 and 18.

  From the above relationship, the deformation amount of the O-rings 17 and 18 is a crushing amount (an amount of elastic deformation given in advance or a sum of the amount of elastic deformation and plastic deformation given in advance), but the crushing amount is large. The O-rings 17 and 18 are fixed “hard”, and when the crushing margin is small, the O-rings 17 and 18 are fixed “soft”.

As described above, by changing the clearance between the O-ring holders 19 and 20 and the fixed portion 21, the crushing allowance can be changed and the rigidity of the O-rings 17 and 18 can be changed. Obtainable. Here, in order to change the clearance between the O-ring holders 19 and 20 and the fixed portion 21, any of the following methods is used in the conventional buffer structure.
(1) Prepare a plurality of parts having different plate thicknesses and hole diameters of the fixed part 21 and replace them.
(2) Prepare a plurality of O-ring holders 19 and 20 having different shapes and replace them.

JP-A-9-89045

  However, in the conventional buffer structure described in Patent Document 1, the structure is complicated because the fixed portion 21 is buffered by using two types of O-rings 17 and 18 having different ring-shaped diameters. There was a problem of becoming.

  Moreover, in the said conventional buffer structure, although buffer performance is changed by changing the clearance gap between the O-ring holders 19 and 20 which hold | maintain O-rings 17 and 18, and the to-be-fixed part 21, it is different in that shape. There was a problem that a plurality of O-ring holders 19 and 20 having a size or fixed portions 21 had to be prepared and replaced.

  Further, in the conventional buffer structure, the entire O-ring holders 19 and 20 and the fixed portion 21 are fixed to the mounting base 23 by the fixing screws 22, but when the fixing screws 22 are removed, the O-ring holders 19 and 20 and There was a problem that the mutual positional relationship with the fixed part 21 could not be maintained.

  Therefore, the present invention has been made in view of the problems in the above-described conventional buffer structure, and has a buffer structure that is simple in structure, has a small number of parts, and can easily change the buffer performance. The purpose is to provide.

In order to achieve the above object, the present invention provides a first buffer member holding portion that is opposed to and separated from each other, and that the first buffer member holding portion is formed in a through hole formed in a fixed portion. And / or an upper end portion of the second buffer member holding portion is inserted, and an annular buffer member is interposed between the first and second buffer member holding portions and the fixed portion. In this state, the first and second buffer member holding portions are applied with a force in a direction in which the first and second buffer member holding portions are brought close to each other, and sandwich the fixed portion. Provided on the second buffer member holding portion, and provided on the second buffer member holding portion and narrowed toward the first buffer member holding portion. A second inclined surface and a third inclined surface provided at an upper end of the through hole of the fixed portion and parallel to the first inclined surface And a fourth inclined surface that is provided at a lower end of the through hole of the fixed portion and is parallel to the second inclined surface, between the first and third inclined surfaces, and the second and The annular buffer member is interposed between each of the fourth inclined surfaces .

  According to the present invention, the direction in which the pair of shock-absorbing member holding portions are in contact with or separated from the fixed portion, the direction perpendicular to the direction in which the contact is made, or the direction oblique to the direction in which the contact is made Even if an external force is applied from any of these directions, the external force can be absorbed by the annular buffer member interposed between the pair of buffer member holding portions and the fixed portion. It is possible to provide a buffer structure with a small number of parts.

In the buffer structure, each of the first and second buffer member holding portions may include the first and second inclined surfaces in each conical portion. Thereby, an inclined surface can be easily formed on each of the pair of buffer member holding portions.

Further, in the buffer structure, between the first and second buffer member holding portion may comprise a spacer for adjusting each other toward or away from the spacing of the first and second cushioning member holding portion . By changing the thickness of the spacer, etc., the distance between the pair of cushioning member holding portions in the direction of contact with and away from each other is adjusted, and the amount of elastic deformation applied in advance to the annular buffering member, or the amount of elastic deformation applied in advance and plasticity The total amount of deformation can be changed. As a result, the buffer performance can be easily changed, and the required buffer performance can be easily obtained.

Furthermore, in the buffer structure, the first and second buffer member holding portions can be fastened to each other via mechanical fastening means. Thus, the fixed portion can be removed without disassembling the buffer structure.

Further, in the buffer structure, each of said first and second cushioning member holding portion be provided with a through hole which the first and second cushioning member holding portion is formed in the direction toward and away from each other it can. Through this through hole, the buffer structure can be easily fixed to a mounting base or the like together with the fixed portion.

  As described above, according to the present invention, it is possible to provide a buffer structure that is simple in structure, has a small number of parts, and can easily change the buffer performance.

  1 to 4 show an embodiment of a buffer structure according to the present invention. This buffer structure 11 has an O-ring holder (buffer member holding portion) having a male screw portion 3a at the tip and formed in a truncated cone shape. ) 3, and an O-ring holder (buffer member holding portion) 2 having a female screw portion 2 a that is screwed with the male screw portion 3 a of the O-ring holder 3 and having a truncated cone shape like the O-ring holder 3. It is configured to be screwed through a ring-shaped spacer 4.

  The fixed part 5 has an O-ring contact part 5a having a truncated cone-shaped counterbore on both sides. The O-ring (annular buffer member) 1 is fixed in a state of being sandwiched between the side surfaces of the truncated cone portions of the O-ring holders 2 and 3 and the truncated cone-shaped O-ring contact portion 5 a of the fixed portion 5. Here, when the O-ring 1 is fixed by the O-ring holders 2 and 3 and the fixed portion 5, the O-ring 1 is fixed in a state of being slightly crushed from the original dimensions (elastically deformed or partially plastically deformed). Is done.

  The fixed portion 5 is sandwiched between the O-ring holders 2 and 3 from above and below and fixed via the two O-rings 1, and the O-ring holders 2 and 3, together with the fixed portion 5, have through holes 2 b, It is fixed to a mounting base 13 having an internal thread portion 13a by a fixing screw 12 that passes through 3b. In this state, even when an external force is applied to the fixed part 5 from any direction, the O-ring 1 can be deformed according to the external force and exert a buffering effect on the fixed part 5.

  If the spacer 9 thicker than the spacer 4 in FIG. 1 is inserted as shown in FIG. 3, the distance L shown in FIG. 1 becomes longer than L1 and L in FIG. Becomes smaller. As a result, the fixed portion 5 is fixed “softly”.

  On the contrary, as shown in FIG. 4, when the spacer 10 thinner than the spacer 4 of FIG. 1 is inserted, the distance L shown in FIG. 1 becomes shorter than L2 and L in FIG. Becomes larger. As a result, the fixed part 5 is fixed “hard”.

  As described above, by changing the thickness L of the spacer 4 shown in FIG. 1, the distance L between the O-ring holders 2 and 3 and the fixed portion 5 is changed, and the crushing margin of the O-ring 1 is adjusted, The rigidity of the O-ring 1 can be changed, and a required buffer performance can be obtained.

  As shown in FIG. 5, in an environment where vibrations and impacts are applied, such as outer space, when using a device 6 using parts that are extremely vulnerable to vibrations and impacts, such as mechanical relays and crystal oscillators. By mounting the device 6 on the mount 13 via the buffer mechanism 11 having the above-described configuration, vibrations and impacts on the device 6 can be mitigated and failure of the device 6 can be prevented.

It is sectional drawing which shows one Embodiment of the buffer structure concerning this invention. It is a disassembled perspective view of the buffer structure of FIG. It is sectional drawing which shows an example of the state which replaced | exchanged the spacer of the buffer structure of FIG. It is sectional drawing which shows an example of the state which replaced | exchanged the spacer of the buffer structure of FIG. It is a partial sectional view showing one example of a buffer structure concerning the present invention. It is sectional drawing which shows an example of the conventional buffer structure. It is sectional drawing which shows the state in which the load of the axial direction of the fixing screw was applied to the buffer structure of FIG. FIG. 7 is a cross-sectional view illustrating a state in which a load in a direction perpendicular to the axial direction of the fixing screw is applied to the buffer structure in FIG. 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 O ring 2 O ring holder 2a Female thread part 2b Through-hole 3 O-ring holder 3a Male thread part 3b Through hole 4 Spacer 5a O-ring contact part 5 Fixed part 6 Fixed apparatus 9 Spacer 10 Spacer 11 Buffering structure 12 Fixing screw 13 Attachment Base 13a Female thread

Claims (5)

The first and second shock-absorbing member holding portions that are in contact with and away from each other are arranged to face each other , and the lower end portion of the first shock-absorbing member holding portion and / or the second hole are formed in the through hole formed in the fixed portion. The upper end portion of the buffer member holding portion is inserted, and the first and second buffer member holding portions are interposed between the first and second buffer member holding portions and the fixed portion. A buffering device that applies a force in a direction in which the buffering member holding part is brought close to the buffering member holding part, and sandwiches the fixed part,
A first inclined surface provided in the first buffer member holding portion and constricted toward the second buffer member holding portion;
A second inclined surface provided in the second buffer member holding portion and narrowed toward the first buffer member holding portion;
A third inclined surface provided at an upper end of the through-hole of the fixed portion, and parallel to the first inclined surface;
Provided at the lower end of the through hole of the fixed portion, and a fourth inclined surface parallel to the second inclined surface,
A buffer structure characterized in that the annular buffer member is interposed between the first and third inclined surfaces and between the second and fourth inclined surfaces . 2. The shock absorbing structure according to claim 1 , wherein each of the first and second shock absorbing member holding portions includes the first and second inclined surfaces in each conical portion. Between the first and second buffer member holding unit, according to claim 1 or 2, characterized in that it comprises a spacer for adjusting each other toward or away from the spacing of the first and second cushioning member holding portion The buffer structure described in 1. The buffer structure according to claim 1, 2 or 3, wherein the first and second buffer member holding portions are fastened to each other via mechanical fastening means. Each of said first and second buffer member holding portion to claim 1, characterized in that it comprises a through hole which the first and second cushioning member holding portion is formed in the direction toward and away from each other 5. The buffer structure according to any one of 4 above.

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