JPS60155023A - Damper device - Google Patents

Abstract

PURPOSE:To aim at simplifying and miniaturizing the structure of a damper device, and as well at reducing the cost of the device, by exhibiting a damping function for external force with the use of friction force which is effected between a soft resilient piece and a deformation-resistant thin plate upon deformation of the soft resilient piece. CONSTITUTION:A damping member 13 in a damper device 10 is formed by alternately stacking a plurality of sliced soft resilient pieces 11 made of rubber such as, for example, synthetic rubber, soft articles of polyvinyl chloride, resilient plastic such as, for example, flexible foam material, etc. and deformation- resistant thin plates 12 made of tension and compression resistant material and having a large frictional coefficient with respect to the soft resilient pieces 11. This damping member 13 in a stacked condition is disposed in an inner hole 15 in a casing 14 and is held under a pressurized condition with a certain compression force being beforehand exerted in the stacking direction, thereby it receives impact force F as external force from the stacking direction.

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention is capable of exerting a buffering function against an impact force as an external force by skillfully utilizing the frictional force generated when an elastic material is compressed and released. Regarding a shock absorber.

``Prior art'' This type of shock absorber is used in equipment and equipment for each phase, including dampers to stop moving objects, vibrating objects, etc. at desired positions. It is widely used in various fields.

In particular, when it comes to movable objects such as movable tables in machine tools, robot arms of industrial robots, and even pointers of various instruments, these objects can be correctly positioned in a short time with a short operating stroke. Therefore, the performance as the above-mentioned shock absorbing device is greatly required.

Various configurations have been proposed for this glazed shock absorber 17, such as a direct-acting piston-type fluid pressure type that utilizes a full orifice that resists the flow of oil, etc., and a check valve. Solid friction types are known, which make full use of the V friction between two discs or bands and a cylindrical body by pressing them together, but all of them have complicated structures. The reality is that the damping effect is not very good, and it is desired that some kind of countermeasure be taken. In particular, in the conventional i11 mentioned above, the former hydraulic type monobloc has a large operating stroke, and it cannot be said that the positioning of the movable body can be performed accurately, and when precision in the stopping position of the movable body is required. However, the problem of having to provide all the positioning members separately was a rare problem. So[
7. In such conventional devices, the overall size of the device tends to increase, and there are problems in mounting it to the main equipment. In addition, the latter solid friction type was significantly inferior in terms of buffering performance, which limited its range of application.

[Summary of the invention]

The present invention has been made in view of the above-mentioned circumstances, and has a simple structure in which the entire cushioning body is formed by laminating a plurality of sliced soft elastic pieces through thin plates that are difficult to deform. All impact forces applied from the stacking direction can be easily and appropriately alleviated, greatly improving operational reliability on the main equipment side.The number of parts is small, making it easy to assemble, and the overall device is compact. The present invention provides a shock absorbing device that can be made more compact and lower in cost.

[Example] Hereinafter, the present invention will be explained in detail using Example J shown in the drawings. 1. Figures 1 and 2 show an example of the shock absorber according to the present invention. In the straw diagram, the whole code is 10
Buffer side 1; 1, a plurality of sliced soft elastic pieces 11 made of, for example, rubber, synthetic rubber such as neoprene, soft products such as polyvinyl chloride, elastic plastics such as flexible foam; A thin plate 12 that is difficult to deform and has a large coefficient of friction with the soft elastic piece 11 mentioned above is interposed between each piece using a material that can withstand tension and compression, such as a gold oval (~Sword I). A buffer body 13 is formed by combining (1), and this buffer body 13 is housed in an inner hole 15 of a case 14 having a substantially cylindrical shape in a stacked state. 1
The large diameter part 16a of the impact receiving head 16 supported by the step part 15a formed at one end of the inner hole 15 and the blind plug 17 that closes the other end of the inner hole 15 compress the inner hole 15 to a certain degree in the stacking direction in advance. It is held in a preloaded state where force is applied. Here, a space 18 is formed between the shock absorber 13 and the inner hole 15 of the case 14 as a margin due to compressive deformation of the shock absorber 13 along the curve. Further, the impact receiving head 16
Small-diameter head portion 16btj: Projects outward from the small-diameter opening 19 at one end of the case 14, and receives an external force F( i7) The present invention is not necessarily limited to such a configuration, and it is possible to insert the rond body from the other side through the small diameter opening 19 and insert the loose body. Of course, it is okay to let 13 have the impact power.

In addition, in the figure, 14a4-1 is formed on the outside of the case 14 and is attached using a threaded portion.

1. According to the shock absorber having the above-mentioned structure [10, the impact force F
As shown in FIG. 3, when the soft elastic pieces 11 of the soft elastic pieces 11 are compressed and bulge in the radial direction when receiving an impact, the shock absorber 13 has both end faces of each soft elastic piece 11 and a thin plate that is difficult to deform. 12, and the frictional force generated between the inner end surface of the blind plug 1γ and the inner end surface of the impact receiving head 16 consumes impact energy and exerts a buffering effect. The spring constant in this case is larger than that in the case where it is made only of an elastic material such as rubber having the same mass as the shock absorber 13, and this is expressed as P+ (x) in Figure 4. It can be easily understood from the characteristic curve force consisting of the force of the elastic material shown by the caustic line and the broken line a.

This is because even when each soft elastic piece 11 is restored after the impact force F has been reduced, energy is consumed by the frictional force generated between each soft elastic piece 11 and the hard-to-deform thin plate 12, etc., as in the case of receiving the impact described above. , the repulsive force of this buffer 13 as a whole is small, and this is the caustic line in Fig. 4, F' 2 (X)
It is not easy to understand the difference between power and MB.

According to the laminated type buffer body 13 that characterizes the present invention, as shown in FIG.
(= /Xr Fl(X) Fl(X)] dx l
It is also large and can exert a buffering effect.

That is, when an elastic material is compressed and crushed, its own volume is reduced and its density is increased.

At this time, the distance between each molecule is narrowed and the material becomes hard, but when the pressing force is completely removed, the shape is restored by the elastic force. However, there is a slight delay during this restoration, which results in hysteresis of the physical properties, and this is also clear from the characteristic curve &l of the elastic 14 shown by the broken line in Fig. 4.

The improved hysteresis is due to the frictional force i' generated when the elastic material contacts the fixed part and the suppressed part.
The thickness of the C part is not noticeable but has been increased, and by alternately laminating the soft elastic pieces 11 and the thin plates that are difficult to deform as in the present invention, the above-mentioned hysteresis can be reduced by setting 14 < i if at each part. It is easy to understand that it is possible to maximize the

In addition, in FIG. 4, the soft elastic piece 11 has an area of 25 mm2,
Rubber sheet ladle with a thickness of 0.5 rnm, hard-to-deform thin plate 12
This is a characteristic diagram based on a so-called static method in which a spacer made of stainless steel with an area of 30 mm2 and a thickness of 0.6 mm is used, and a load is gradually added or decreased. Therefore, in practice, instantaneous changes in the load are sufficient to change the shape of this characteristic diagram, but do not significantly change the magnitude of the hysteresis.

However, the device of the present invention is not limited to the structure of the embodiments described above,
Shape, structure, etc. of the trough: You are free to deform and change it as appropriate, and it is only necessary to change the size, shape, etc. as appropriate depending on the equipment used, the magnitude of the impact force, etc.) Ru.

1-Effects of the Invention As explained above, the shock absorber according to the present invention has the following effects:
The shock absorber is formed by laminating a plurality of class-like soft elastic pieces through thin plates that are difficult to deform, so despite its simple structure, this shock absorber can It can greatly improve the operational reliability of the main equipment by appropriately buffering the impact force (external force applied by itself), and it is also simple and has a structure with a small number of parts. Excellent in terms of ease of assembly and cost, and the ability to make the entire device smaller and more compact.*
effective.

7-

[BRIEF DESCRIPTION OF THE DRAWINGS] Figure 1 shows an embodiment of the shock absorber according to the present invention.
I-IT line sectional view, FIG. 3 is an explanatory diagram of its operation, and FIG. 4 is a characteristic diagram showing the relationship between displacement and force in 1 (-1, -). 10... Shocking device, 11. ... Soft elastic piece, 12.
...Difficult to deform thin plate, 13...Buffer, 149...
Case, 16φ...impact receiving head, 17...h° plug, 18...space, 19...opening. Patent applicant Yamatake] / Newel Co., Ltd. agent Masaki Yamakawa (and 2 others) 9-8- Unexamined Japanese Patent Publication No. 155023 (4)

Claims (1)

[Claims] A buffer body formed by stacking a plurality of sliced soft elastic pieces with a thin plate that is hardly deformed between each piece to form a V-shaped structure is provided, and this buffer body is preloaded in the stacking direction. Aya @ Somushi is characterized by being constructed so that it can be housed and held in a case in a state of collapse, and receive impact force from the lamination direction force.