JP3066412U - Vibration absorber - Google Patents

Abstract

(57) [Problem] To provide a vibration absorbing device which does not impair the aesthetic appearance of a vehicle body, has an excellent vibration absorbing effect, and has excellent durability. SOLUTION: Both ends of a shaft tube 3 are bent to stop portions 31.
And the bottom 2 and the shaft cover 5, the oil seal 46, the localization base 45, the throttle valve base 44,
The piston rod 4 provided with the throttle valve piece 443 and the piston 43 is arranged, and the nut 47 is screwed into one end of the piston rod 4. Since the position is restricted by the stop portion 31 inside the shaft tube 3, the main shaft cover 1 and the piston rod 4 inside the main shaft tube 6 shrink corresponding to the shaft tube 3 and vibrate due to the air pressure inside the shaft tube 3. Absorb. Since the cushioning material 8 is provided on the piston rod 4 protruding outside the shaft tube 3, a further vibration absorbing effect can be obtained.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a vibration absorbing device.

[0002]

[Prior art]

 As shown in FIG. 4, a conventional bicycle vibration absorbing structure is provided with a vibration absorber that mainly suppresses vibration of a vehicle body. Spring A, which is inexpensive and easy to mold, is used in a general vibration absorber of a bicycle. This is a method of absorbing the vibration by the characteristic of the vibration absorption of the spring A.

[0003]

[Problems to be solved by the invention]

 However, the spring A becomes fatigued when subjected to vibration for a long period of time. Furthermore, if exposed to sunlight or rain for a long time, rust is generated, and the effect of absorbing vibration is greatly reduced. Since the spring A is selected to have good elasticity, the spring A has a large outer diameter. When the spring A is attached to the vehicle body, the spring A does not fit the whole body, and the appearance of the vehicle body may be impaired.

A spring base B and a middle fitting ring C are provided at both ends of the spring A, and the middle fitting ring C can be adjusted and moved along a shaft rod D. When the threaded portion of the shaft D is moved up and down, the elasticity of the spring A can be adjusted to provide a suitable cushioning function. Because the ring C has an adjusting effect, if the strength between the ring C and the spring base B is not enough, the spring A will loosen and if a person rides a bicycle, The spring A makes a sound. At this time, the effect of the spring A to absorb the vibration is greatly reduced. In order to obtain good vibration absorption, it must always be checked whether the ring C is pulling the spring A strongly. However, this is very troublesome and the vibration absorption effect is not good.

As shown in FIG. 5, there is also a vibration absorber that obtains vibration absorption using atmospheric pressure. Mainly, a piston G and a plurality of gas shut-off parts H 2 are fitted inside the outer cover base E and the inner cover base F. A ring I is fixed to a portion where the outer cover base E and the inner cover base F are fitted into each other. At the end of the outer cover base E, a suction port E1 into which gas is injected is provided. A piston G is fixed to the inner end of the inner cover base F, and a plurality of gas shutoff components H are fitted in the outer wall. When used, the inner cover base F is slid to the opposite outer cover base E by the piston G to obtain a vibration absorbing effect.

In this structure, the outer cover base E and the inner cover base F slide and move relative to each other, so that a vibration absorbing effect can be obtained. For example, when changing the diameter or shape of the tube, the internal parts and the size of the inner cover stand correspond to the size of the outer cover stand. In addition to changing the internal gas shut-off parts, such as O-rings, must be changed. This requires the production of dies, which requires a large amount of dies and parts, which results in high manufacturing costs and poor competitiveness in the market.

[0007] In general, air in the atmosphere is injected into the pipe at a high pressure. However, since the air contains many types of gases and large molecules, the gas shut-off parts used in the above structure are broken. Gas leakage after use for a while. Therefore, the pressure inside the pipe must always be checked for a standard value.

Accordingly, the present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a vibration absorbing device that does not impair the aesthetic appearance of the body of a bicycle. Another object of the present invention is to provide a vibration absorbing device having an excellent vibration absorbing effect. Another object of the present invention is to provide a vibration absorbing device having excellent durability.

[0009]

[Means for Solving the Problems]

 According to a first aspect of the present invention, there is provided a vibration absorbing device having a hollow main shaft cover and a main shaft tube having an opening at one end, and a shaft having a through hole in an axial direction. Pipe, bottom base and piston housed in the shaft pipe, piston rod with threads of different diameters at both ends, thin ring-shaped throttle valve piece, through-hole and throttle valve piece at the center of the pedestal surface , A throttle valve base having a plurality of convex portions facing each other, a cylindrical positioning base having a concave groove on the outer wall and a through hole in the axial direction, and a cylindrical lid with a concave inside. It consists of an oil seal that prevents lubricating oil from leaking from the periphery of the piston rod, a cylindrical shaft cover through which the piston rod or shaft pipe penetrates in the axial direction, and a cylindrical cushioning material made of elastic rubber. Have been.

The main shaft cover and the main shaft tube have ends fixed to the body of the bicycle, and a stepped portion provided with a screw hole in the axial direction is formed at the center of the inner bottom. In the bottom, a convex column provided with a groove is screwed into a fixing hole provided in the axial direction above the bottom, and a concave groove provided with an exhaust port communicating with the fixing hole is formed in the bottom. It is provided on the outer wall. The piston has, at one end, a recess provided at the center with a shaft hole through which the piston rod passes, and the recess has a plurality of table holes.

A piston rod provided with a stop by bending both ends of a shaft pipe, and a bottom base and a shaft cover, an oil seal, an orienting base, a throttle valve base, a throttle valve piece, and a piston provided inside the shaft pipe. And screw a nut into one end of the piston rod. Since the position is restricted by the stop inside the shaft tube, the main shaft cover and the piston rod inside the main shaft tube shrink corresponding to the shaft tube, and absorb the vibration by the air pressure inside the shaft tube. Since the cushioning material is provided on the piston rod protruding outside the shaft tube, a further vibration absorbing effect can be obtained.

According to the vibration absorbing device of the second aspect of the present invention, the cushioning material is fitted to the end of the piston rod so that adjacent cushioning materials have different elasticity.

According to the vibration absorbing device of the present invention, the main shaft pipe has a concave step hole in the inner wall of the opening, and the step hole is provided with a shaft cover for preventing side leakage, A screw is provided on the outer wall of the unit to fix the dust cover. One end of the dustproof cover has a blocking fence provided inside with a dustproof rubber having a cone portion formed at one end, and is fixed to the outer wall of the shaft tube. The other end of the dustproof cover has a thread on the inner wall and is screwed into the thread of the spindle tube.

[0014]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the vibration absorbing device according to one embodiment of the present invention includes a main shaft cover 1, a bottom base 2, a shaft pipe 3, a piston rod 4, a piston 43, a throttle valve base 44, a throttle valve piece 443, and a localization base. 45, an oil seal 46, a shaft cover 5A, a main shaft pipe 6, a dustproof cover 7, and several cushioning members 8. The spindle cover 1 and the spindle tube 6 are opposed hollow tubes.

One of the main shaft cover 1 and the main shaft tube 6 is a penetrating body, and one end is provided with through holes 11 and 61, and the through holes 11 and 61 are respectively provided with a rough shaft 12. Steps 13 and 62 are formed at the ends of the spindle cover 1 and the spindle tube 6 inside the tube. Screw holes 14 and 63 are provided in the center of the steps 13 and 62 in the axial direction. A concave step hole 64 is provided in the inner wall of the opening at the other end of the main shaft tube 6, and the shaft cover 5A is installed. A screw portion is formed on the outer wall of the opening.

A groove 21 is provided on the outer wall of the base 2, and an O-shaped ring 22 can be fitted therein. An exhaust port 211 communicating with the fixing hole 23 is provided in the groove of the concave groove 21. A convex pillar 24 having a fixing hole 23 provided with a concave groove in the axial direction and having a groove is screwed into the upper surface of the base 2. As shown in FIG. 2, the shaft pipe 3 is a flat pipe body penetrating in the axial direction, and both ends of the pipe are provided with curved stopping portions 31.

The two ends of the piston rod 4 are provided with two screw portions 41 and 42 having different outer diameters. The piston 43 is formed so as to be housed in the shaft tube 3. An O-shaped ring 431 is fitted into the outer wall of the piston 43, and a recess 432 is provided at one end. A shaft hole 433 having a size corresponding to the diameter of the piston rod 4 is provided at the center of the recess 432, and a plurality of table holes 434 are provided at the edge of the recess 432.

A through hole 441 and a plurality of projections 442 are provided in a seat surface of the throttle valve base 44. The convex portion 442 faces the throttle valve piece 443 and forms an appropriate gap between the throttle valve base 44 and the throttle valve piece 443. The throttle valve piece 443 has a thin ring shape. The orientation table 45 is provided with a concave groove 451. The center is hollow so that the piston rod 4 can be inserted. As a result, the area of the peripheral portion of the orientation table 45 increases, and the inner wall of the shaft tube 3 and the piston rod 4 are stabilized.

The oil seal 46 has the shape of a circular tube cap that is recessed inward, and prevents the lubricating oil on the rod wall of the piston rod 4 from leaking to the outside. The shaft covers 5, 5A are pipes penetrating in the axial direction, and are provided on the piston rod 4 or the shaft tube 3 to prevent lateral leakage.

A dust barrier 71 is formed at one end of the dustproof cover 7, and a dustproof rubber 72 is disposed there. One end of the dustproof rubber 72 is formed with a cone 721. The other end of the dustproof cover 7 is provided with a groove in the inner wall portion, and is fitted into the screw portion at the end of the main shaft tube 6. The cushioning material 8 is an elastic rubber of a tubular body. In this embodiment, two kinds of cushioning materials 8 having different elasticity are used.

As shown in FIG. 2, one end of the shaft tube 3 is bent inward to form a stop portion 31, and the base 2 is provided inside the shaft tube 3. One end of the base 2 is pressed by the shaft tube 3. Parts such as a shaft cover 5, an oil seal 46, a localization base 45, a throttle valve base 44, a throttle valve piece 443, and a piston 43 are sequentially fitted into the piston rod 4. The nut 47 is screwed into the screw portion 41, and the above components are fixed at the tip of the piston rod 4, and the nut 47 is housed in the recess 432. The piston rod 4 is inserted into the other end of the shaft tube 3 together with the above-mentioned parts, and the end of the shaft tube 3 is bent to form a stop 31. By holding down the end face of the shaft cover 5 fitted in the piston rod 4, the piston rod 4 is not indirectly prevented from coming off. The part outside the piston rod 4 is fitted with a cushioning material 8 having a different elasticity. By alternately arranging the high-elasticity cushioning material 8 and the low-elasticity cushioning material 8 at the end of the piston rod 4, an appropriate length of sliding distance is formed between the stop portion 31 and the step portion 62. Is done. Further, the dust cover 7 is put on the outer wall of the corresponding shaft tube 3. The dustproof rubber 72 inside the dustproof cover 7 makes it easier for the cone 721 to cover the outer wall of the shaft tube 3. The screw portion 42 of the piston rod 4 is screwed into the screw hole 63 of the main shaft pipe 6 to improve the contact between the step portion 62 and the end surface of the cushioning material 8. The dust cover 7 is screwed to a threaded portion at the end of the main shaft tube 6. The high-pressure nitrogen gas is injected from the fixing hole 23 and flows into the inside of the shaft tube 3 from the exhaust port 211.

When the nitrogen gas inside the shaft tube 3 reaches a certain pressure, the base 2 receives pressure and its end face is pushed toward the stop 31. The O-shaped ring 22 closes the exhaust port 211 when pressure is applied, and the nitrogen gas cannot flow out of the exhaust port 211 but remains inside the shaft tube 3. The protruding columns 24 are screwed into the corresponding fixing holes 23, and the protruding columns 24 projecting outside the shaft tube 3 are screwed into the screw holes 14 of the main shaft cover 1, thereby forming a bar having vibration absorption.

As shown in FIG. 3, at the time of operation, the shaft cover 1 and the shaft shaft 12 are respectively attached to the ends of the spindle tube 6 and the shaft shaft 12, and are attached to corresponding positions of the vehicle body as in the conventional case. When the vehicle body vibrates, the main shaft tube 6 compresses and moves the shaft tube 3 in conjunction with the piston rod 4, and moves in a unidirectional manner composed of the piston 43, the throttle valve piece 443 and the throttle valve base 44 on the upper part of the piston rod 4. Cover the valve. Thereby, the gas inside the shaft tube 3 is restricted to flow only in a single direction, and the gas inside the shaft tube 3 has a constant pressure. Absorb.

The method for absorbing vibration according to the present embodiment is applied to the main shaft cover 1 and the main shaft tube 6 because the vibration is mainly absorbed by the piston rod 4 sliding inside the shaft tube 3. Even if the location is different, it is sufficient to change the assembling method or shape, and it can be applied regardless of the size of the body. The inner diameters of the main shaft cover 1 and the main shaft tube 6 may be any as long as the piston rod 4 and the main tube 3 can be accommodated.

In addition, in order to prevent the vibration absorbing effect from being greatly reduced due to the leakage of nitrogen gas inside the shaft tube 3, several different elastic materials 8 having different elasticity are fitted into the shaft tube 3, When the shaft tube 3 slides and moves in accordance with the rod 4, the cushioning material 8 is supported by the step portion 62, and a double vibration absorbing effect is obtained. The structure of the present invention is not limited to the structure of a bicycle, but can be applied to a bicycle of a car, a motorcycle or a health appliance as needed, and the same effect can be obtained.

[0026]

[Effect of the invention]

 As described above, the vibration absorbing device of the present invention is composed of the main shaft cover, the base, the shaft tube, the piston rod, the piston, the throttle valve base, the throttle valve piece, the oil seal, the shaft cover, the main shaft tube, and the cushioning material. Have been. Bend both ends of the shaft tube to make a stop, and wrap the base and piston rod inside the shaft tube. Since the position inside the shaft tube is restricted by hitting the stop at the end of the shaft tube, the spindle cover and the piston rod inside the shaft tube shrink in accordance with the shaft tube during operation, absorbing vibrations due to the air pressure inside the shaft tube. It has the feature of doing. This has the following effects.

1. In the vibration absorbing device of the present invention, the vibration is mainly absorbed by compressing the air in the shaft tube by sliding the piston rod through the shaft tube. It is not affected by the size of the pipe diameter of the main pipe and the main cap, and the main pipe and the main cap having different pipe diameters can be used, so that the adaptability is high. Further, since there is no need to newly manufacture a mold or a part, manufacturing costs can be reduced.

[0028] 2. In the vibration absorbing device of the present invention, high pressure nitrogen gas is injected to obtain a vibration absorbing effect. Since the nitrogen gas molecules are small, parts for absorbing vibration are not easily broken. That is, the durability is high. 3. The vibration absorber of the present invention has a small volume and light weight, and does not impair the aesthetic appearance of the bicycle.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a vibration absorber according to an embodiment of the present invention;

FIG. 2 is a plan view showing a vibration absorbing device according to an embodiment of the present invention.

FIG. 3 is a plan view illustrating a vibration absorbing device according to an embodiment of the present invention;

FIG. 4 is a perspective view showing a conventional vibration absorbing device.

FIG. 5 is a plan view showing a conventional vibration absorbing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spindle lid 2 Bottom stand 3 Shaft tube 4 Piston rod 5 Shaft cover 5A Shaft cover 6 Spindle tube 7 Dustproof cover 8 Buffer material 11 Through hole 12 and wick shaft 13 Step portion 14 Screw hole 21 Concave groove 22 O-shaped ring 23 Fixed Hole 24 Convex pillar 31 Stop portion 41 Screw portion 42 Screw portion 43 Piston 44 Throttle valve stand 45 Positioning stand 46 Oil seal 47 Nut 61 Through hole 62 Step portion 63 Screw hole 64 Step hole 71 Blocking fence 72 Dustproof rubber 211 Exhaust port 431 O Shaped ring 432 Depression 433 Shaft hole 434 Table hole 441 Through hole 442 Convex column 443 Throttle valve piece 451 Concave groove 721 Conical part A Spring B Spring stand C Fitted ring D Shaft E Outer cover base E1 Suction port F Inner cover Table G Piston H Gas shut-off part I Ring

Claims (3)

[Utility model registration claims] 1. A hollow main shaft cover having an opening at one end, a hollow main shaft tube having an opening at one end, a shaft tube having a through hole in an axial direction, and housed in the shaft tube. A bottom plate, a piston rod having screw portions having different diameters at both ends, a piston housed in the shaft pipe, a thin ring-shaped throttle valve piece, a through hole and a throttle valve piece at the center of the base surface. A throttle valve base having a plurality of convex portions facing each other, a cylindrical positioning base having a concave groove in an outer wall portion and having a through hole in an axial direction, and an oil seal in the shape of a tube lid indented inward, A cylindrical shaft cover through which the piston rod or the shaft tube penetrates in the axial direction; and a cylindrical cushioning material made of elastic rubber, wherein the main shaft cover and the main shaft tube have their ends fixed to the vehicle body, respectively. With screw holes in the axial direction Stairs are formed at the center of the inner bottom, respectively. A convex pillar having a groove provided in a fixing hole provided in an axial direction above the bottom is screwed into the outer wall of the bottom. A concave groove provided with an exhaust port communicating with the fixing hole is formed, and the piston has, at one end, a hollow in which a shaft hole through which the piston rod penetrates is provided at a center portion, and a periphery of the shaft hole. A plurality of mounting holes are provided in the portion, and both ends of the shaft tube are bent to form a stop portion, and the bottom base and the shaft cover, the oil seal, the localization base, the throttle valve are formed inside the shaft tube. A table, the piston rod provided with a throttle valve piece and a piston are arranged, and a nut is screwed into one end of the piston rod,
The vibration absorbing device, wherein the cushioning material is provided on a portion of the piston rod protruding outside the shaft tube. 2. The vibration absorbing device according to claim 1, wherein the cushioning member is provided at an end of the piston rod such that adjacent cushioning members have different elasticities. 3. The dustproof cover has a blocking wall provided with dustproof rubber having a cone portion formed at one end. One end is fixed to an outer wall portion of the shaft tube, and a screw portion is provided at an inner wall portion. The other end is screwed into a threaded portion of the main shaft tube, the main shaft tube has a recessed step hole in the inner wall of the opening, the shaft cover is fitted in the step hole, and the outer wall of the opening portion 2. The vibration absorbing device according to claim 1, further comprising a screw portion for fixing the dust cover.