CN213360918U - Double-air-chamber shock absorber - Google Patents

Abstract

The utility model provides a double-air-chamber shock absorber belongs to mechanical technical field. It has solved the not enough scheduling problem of current shock absorber stability. The double-air-chamber shock absorber comprises a working cylinder, a piston rod is arranged in the working cylinder, a piston valve assembly is fixedly connected onto the piston rod, the inner cavity of the working cylinder is divided into an upper oil chamber and a lower oil chamber by the piston valve assembly, a piston cavity is arranged in the piston rod, a first piston capable of sliding is arranged in the piston cavity, the piston cavity is divided into the first air chamber and the first oil chamber by the first piston, an oil passage for communicating the first oil chamber with the lower oil chamber is formed in the piston valve assembly, an external cylinder is fixed on the outer side of the working cylinder, a second piston capable of sliding is arranged in the inner cavity of the external cylinder, the second piston forms a seal with the cavity wall surface of the inner cavity of the external cylinder and divides the inner cavity of the external cylinder into the second air chamber and the second oil chamber, and an oil pipe for. The shock absorber improves the working stability.

Description

Double-air-chamber shock absorber

Technical Field

The utility model belongs to the technical field of machinery, a double air chamber shock absorber is related to.

Background

The suspension is a general term for a force transmission connecting device between a wheel and a vehicle body of an automobile, and has the functions of transmitting force and moment between the wheel and the vehicle body, buffering impact force transmitted to the vehicle body from an uneven road surface, and reducing vibration caused by the impact force so as to ensure that the automobile can run smoothly. The suspension comprises an elastic element, a shock absorber and a force transmission device which respectively play roles in buffering, shock absorbing and force transmission. The shock absorber is used to suppress the shock of the spring after absorbing shock and the impact from the road surface, and is widely used in automobile to accelerate the attenuation of the vibration of the frame and the automobile body and improve the running smoothness of the automobile.

Chinese patent literature discloses a dual-tube inflatable shock absorber [ application No.: CN 02215490.6; the notice number is: CN2530096Y ]: the hydraulic oil cylinder comprises a piston rod, an oil storage cylinder, a cylinder barrel, a guide seat, an oil seal cover and an oil seal, wherein a piston cavity formed by the cylinder barrel is filled with hydraulic oil, and an oil-gas mixing cavity formed by the cylinder barrel and the oil storage cylinder is filled with hydraulic oil and medium-pressure gas. The piston rod is connected with a piston valve assembly, and the other ends of the oil storage cylinder and the cylinder barrel are provided with a bottom valve assembly. Because the oil-gas mixing cavity contains both hydraulic oil and gas, when the shock absorber vibrates violently, the gas and the hydraulic oil are mixed, namely bubbles are generated in the hydraulic oil, and the bubbles can vibrate and be unstable when passing through the piston valve assembly and the bottom valve assembly, so that the shock absorber is unstable in working.

Disclosure of Invention

The utility model aims at the above-mentioned problem that prior art exists, provide a double air chamber shock absorber, solved the not enough technical problem of current shock absorber stability.

The purpose of the utility model can be realized by the following technical proposal:

a double-air-chamber shock absorber comprises a working cylinder, wherein a movable piston rod is arranged in an inner cavity of the working cylinder, the upper end of the piston rod extends out of the working cylinder, the lower end of the piston rod is fixedly connected with a piston valve assembly, the inner cavity of the working cylinder is divided into an upper oil chamber and a lower oil chamber by the piston valve assembly, the shock absorber is characterized in that a piston cavity is arranged in the piston rod, a slidable first piston is arranged in the piston cavity, the first piston and the cavity wall surface of the piston cavity form sealing to divide the piston cavity into the first air chamber and the first oil chamber, the first air chamber is positioned above the first oil chamber, an oil through channel for communicating the first oil chamber and the lower oil chamber is arranged on the piston valve assembly, an external cylinder is fixed on the outer side of the working cylinder, a slidable second piston is arranged in the inner cavity of the external cylinder, the second piston and the cavity wall surface of the internal cavity of the external cylinder form sealing to divide the second air chamber and, the second air chamber is positioned above the second oil chamber, and an oil pipe used for communicating the second oil chamber with the lower oil chamber is connected between the working cylinder and the external cylinder.

The first air chamber and the second air chamber are filled with gas, and the first oil chamber, the upper oil chamber, the lower oil chamber and the second oil chamber are filled with shock absorber oil. When the piston rod is located at the maximum stretching stroke, the first piston is located at the lowest end of the piston cavity, and the second piston is located at the lowest end of the inner cavity of the external cylinder. The piston rod is positioned in the upper oil chamber, the increased volume of the upper oil chamber is smaller than the reduced volume of the lower oil chamber, redundant shock absorber oil in the lower oil chamber firstly enters the first oil chamber through the oil through passage, the first piston slides upwards, the gas in the first air chamber is compressed and generates downward pressure on the first piston, after the gas in the first air chamber is not compressed any more, the shock absorber oil in the lower oil chamber enters the second oil chamber through the oil through pipe, the second piston moves upwards, and the gas in the second air chamber is compressed and generates downward pressure on the second piston. The pressure generated when the gas in the first air chamber and the second air chamber is compressed and the resistance generated when the shock absorber oil passes through the piston valve assembly jointly form the compression damping force of the shock absorber, the compression strokes of the piston rods are different, the volumes of the first air chamber and the second air chamber are different, the generated pressures are different, and different compression damping forces are generated by different compression strokes in a self-adaptive mode.

When the piston rod upwards stretched, the volume of going up the grease chamber reduces, the volume of grease chamber increases down, the shock absorber oil of going up the grease chamber passes through piston valve assembly and enters into grease chamber down, but because the piston rod is arranged in last grease chamber, the volume that goes up the grease chamber reduction is less than the volume that grease chamber increases down, gaseous promotion second piston downstream in the second gas chamber, the shock absorber oil in the second grease chamber enters into grease chamber down through leading to oil pipe, gaseous promotion first piston downstream in the first gas chamber, the shock absorber oil in the first grease chamber enters into grease chamber down through leading to the oil passageway, avoid appearing the vacuum state in the grease chamber down, the formation of idle stroke has been avoided.

Keep apart first air chamber and first grease chamber through first piston, keep apart second air chamber and second grease chamber through the second piston, avoid during gas in the first air chamber and the gas in the second air chamber enter into shock absorber oil, sneak into the bubble in having avoided shock absorber oil to shock absorber job stabilization nature has been improved. The piston cavity is arranged in the piston rod, the external cylinder is fixed on the outer side of the working cylinder, the space in the piston rod and the space outside the working cylinder are fully utilized, the first air chamber and the second air chamber are added to the working cylinder under the condition that the length of the working cylinder is not lengthened, the longitudinal installation space of the working cylinder on an automobile suspension is ensured, and the shock absorber can be assembled in an automobile.

In the double-air-chamber shock absorber, the cavity wall surface of the piston cavity is provided with a convex limiting stop shoulder, the limiting stop shoulder is positioned above the first piston, and the first piston can abut against the limiting stop shoulder. The position of the first piston sliding upwards is limited through the limiting blocking shoulder, and the phenomenon that the air pressure of the first air chamber is too large due to the fact that the first piston compresses air in the first air chamber too much is avoided, so that the use stability of the shock absorber is guaranteed.

In the double-air-chamber shock absorber, a first positioning groove is formed in the outer side surface of the first piston, a first sealing ring is fixed in the first positioning groove, and the outer side surface of the first sealing ring is abutted against the wall surface of the cavity of the piston cavity to form sealing; and a second positioning groove is formed in the outer side surface of the second piston, a second sealing ring is fixed in the second positioning groove, and the outer side surface of the second sealing ring is attached to the wall surface of the cavity of the inner cavity of the external cylinder to form sealing. The first sealing ring is fixed through the first positioning groove, so that the first sealing ring is prevented from falling off from the first piston in the sliding process of the first piston, and the sealing property between the first air chamber and the first oil chamber is ensured; the second sealing ring is fixed through the second positioning groove, so that the second sealing ring is prevented from falling off from the second piston in the sliding process of the second piston, the sealing property between the second air chamber and the second oil chamber is ensured, and the use stability of the shock absorber is favorably ensured.

In the above shock absorber with dual air chambers, the piston valve assembly includes a piston valve seat, a central hole is disposed at the center of the piston valve seat, a central shaft is fixedly connected in the central hole, the oil passage is disposed on the central shaft, and the upper end of the central shaft is inserted into and fixed to the piston cavity of the piston rod. When the first piston is installed, the first piston is placed into the piston cavity from the lower end of the piston rod, then the upper end of the central shaft is inserted into the piston cavity of the piston rod and fixed, and then the piston valve seat is fixedly connected onto the central shaft, so that the first piston is convenient to install, and meanwhile, the piston valve assembly and the piston rod are convenient to assemble.

In the shock absorber with the double air chambers, the side wall of the lower end of the working cylinder is provided with the oil through hole, the inner hole of the oil through pipe is communicated with the oil through hole, the lower end of the working cylinder is fixedly provided with the base, the lower end of the central shaft extends out of the central hole, the lower end of the central shaft can abut against the base, and the piston valve seat is positioned above the oil through hole when the lower end of the central shaft abuts against the base. The base and the center shaft are matched to limit the downward movement position of the piston valve assembly, so that the piston valve assembly is prevented from blocking an oil through hole, the circulation between the second oil chamber and the lower oil chamber is ensured, and the use stability of the shock absorber is ensured.

In the double-air-chamber shock absorber, a baffle ring is arranged on the outer side surface of the upper end of the central shaft and above the piston valve seat, and the upper end surface of the piston valve seat is abutted against the baffle ring. The baffle ring has an axial positioning effect, and is convenient for assembling the piston valve seat and the central shaft.

In the double-air-chamber shock absorber, the lower end surface of the piston rod abuts against the upper end surface of the baffle ring. The baffle ring has a positioning function on the assembly of the piston rod and the central shaft, and is convenient for the assembly between the piston rod and the central shaft.

In the double-air-chamber shock absorber, the lower end of the piston rod is welded and fixed with the baffle ring. Can separate first grease chamber and last oil chamber like this, avoid shock absorber oil to circulate between first grease chamber and last oil chamber through the space between piston rod and the center pin directly, guarantee that piston valve assembly forms the damping force, make the shock absorber stable in use.

In the double-air-chamber shock absorber, a fixing frame is connected between the external cylinder and the working cylinder. The fixed frame makes fixed stable between external jar and the working cylinder, avoids external jar and working cylinder to take place to separate when shock absorber during operation, guarantees the stability that the shock absorber used.

In the double-air-chamber shock absorber, the upper end of the piston rod is provided with the valve inside, and the upper end of the external cylinder is provided with the high-pressure inflation valve. The first air chamber of the piston rod is filled with low-pressure air through the valve core, and the second air chamber of the external cylinder is filled with high-pressure air through the high-pressure inflation valve, so that the air is conveniently filled.

Compared with the prior art, the utility model has the advantages of it is following:

set up the piston chamber and install first piston on the piston rod, form first air chamber and first grease chamber in the piston chamber, at the fixed external jar in the working cylinder outside, install the second piston in the external jar and form second air chamber and second grease chamber, first grease chamber and second grease chamber communicate with the lower grease chamber in the working cylinder respectively, avoid the formation of idle stroke, and can make compression damping force according to the emergence change of compression stroke self-adaptation, and can realize the gas-oil isolation through first piston and second piston, avoid producing the bubble in the shock absorber oil, make shock absorber job stabilization. The cavity wall surface of the piston cavity is provided with a limiting blocking shoulder, and a fixing frame is connected between the external cylinder and the working cylinder, so that the vibration absorber is further stable in work. The piston valve assembly is connected with the piston rod through the central shaft, and the assembly is convenient. The valve core and the high-pressure inflation valve are arranged, so that the gas can be conveniently inflated.

Drawings

FIG. 1 is a cross-sectional view of the present dual chamber shock absorber;

FIG. 2 is an enlarged fragmentary view of the piston valve assembly of FIG. 1;

FIG. 3 is a cross-sectional view of the first piston of the present dual chamber shock absorber;

FIG. 4 is a cross-sectional view of the second piston in the present dual chamber shock absorber.

In the figure, 1, a working cylinder; 1a, an oil applying chamber; 1b, a lower oil chamber; 1c, oil through holes; 1d, a base; 2. an external cylinder; 2a, a second air chamber; 2b, a second oil chamber; 2c, a high-pressure inflation valve; 3. a fixed mount; 4. a director oil seal assembly; 5. a piston rod; 5a, a piston cavity; 5a1, a first air chamber; 5a2, a first oil chamber; 5b, a limiting shoulder; 5c, a valve core; 6. a piston valve assembly; 6a, a piston valve seat; 6a1, center hole; 6b, a central shaft; 6b1, stop ring; 6b2, oil through channel; 7. a first piston; 7a, a first positioning groove; 7b, a first sealing ring; 8. an oil pipe is communicated; 9. a second piston; 9a, a second positioning groove; 9b and a second sealing ring.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1 to 4, the double-air-chamber shock absorber includes a working cylinder 1 and an external cylinder 2, the external cylinder 2 is located outside the working cylinder 1, and a fixing frame 3 is connected between the external cylinder 2 and the working cylinder 1, that is, the external cylinder 2 and the working cylinder 1 are fixedly connected through the fixing frame 3. The fixing frame 3 comprises a supporting bar and two hoops, the two hoops are respectively fixed at two ends of the supporting bar, the working cylinder 1 is fixed in one hoop, and the external cylinder 2 is fixed in the other hoop.

The upper end of the working cylinder 1 is fixed with a guider oil seal assembly 4, a movable piston rod 5 is arranged in the inner cavity of the working cylinder 1, the upper end of the piston rod 5 penetrates through the guider oil seal assembly 4, the lower end of the piston rod 5 is fixed with a piston valve assembly 6, and the piston valve assembly 6 divides the inner cavity of the working cylinder 1 into an upper oil chamber 1a and a lower oil chamber 1 b. A piston cavity 5a is arranged in the piston rod 5, a first piston 7 which can slide is arranged in the piston cavity 5a, the first piston 7 forms a seal with the wall surface of the piston cavity 5a and divides the piston cavity 5a into a first air chamber 5a1 and a first oil chamber 5a2, and the first air chamber 5a1 is positioned above the first oil chamber 5a 2. A first positioning groove 7a is formed in the outer side face of the first piston 7, a first sealing ring 7b is fixed in the first positioning groove 7a, and the outer side face of the first sealing ring 7b abuts against the wall face of the piston cavity 5a to form sealing. The upper end of the piston rod 5 is provided with a valve core 5c, and low-pressure gas is filled into the first air chamber 5a1 through the valve core 5c, wherein the pressure of the low-pressure gas is 0.1 MPa. A convex limiting blocking shoulder 5b is arranged on the cavity wall surface of the piston cavity 5a, the limiting blocking shoulder 5b is positioned above the first piston 7, and the first piston 7 can abut against the limiting blocking shoulder 5 b.

The piston valve assembly 6 comprises a piston valve seat 6a, a compression valve and a recovery valve are arranged on the piston valve seat 6a, a center hole 6a1 is arranged at the center of the piston valve seat 6a, and a center shaft 6b is fixedly connected in the center hole 6a 1. The center shaft 6b has an upper end protruding through the center hole 6a1, and the upper end of the center shaft 6b is inserted into and fixed to the piston chamber 5a of the piston rod 5. A convex ring is arranged on the outer side surface of the upper end of the central shaft 6b and above the piston valve seat 6a, and the upper end surface of the piston valve seat 6a is abutted against the convex ring. The center shaft 6b is screwed into the center hole 6a1, or a nut is screwed into the center shaft 6b after the lower end thereof protrudes through the center hole 6a1, and the center shaft 6b is fixed to the piston valve seat 6a by the nut. The lower end surface of the piston rod 5 abuts against the upper end surface of the stop ring 6b1, the lower end of the piston rod 5 is welded and fixed with the stop ring 6b1, or the upper end of the central shaft 6b is inserted into the piston rod 5 to form threaded connection, and a sealing element is arranged between the upper end of the central shaft 6b and the lower end of the piston rod 5. The piston valve assembly 6 is provided with an oil passage 6b2 that communicates the first oil chamber 5a2 with the lower oil chamber 1b, the oil passage 6b2 is provided on the center shaft 6b, and the oil passage 6b2 penetrates the upper and lower ends of the center shaft 6 b.

A slidable second piston 9 is installed in the inner cavity of the external cylinder 2, the second piston 9 forms a seal with the wall surface of the inner cavity of the external cylinder 2 and divides the inner cavity of the external cylinder 2 into a second air chamber 2a and a second oil chamber 2b, and the second air chamber 2a is positioned above the second oil chamber 2 b. A second positioning groove 9a is formed in the outer side surface of the second piston 9, a second sealing ring 9b is fixed in the second positioning groove 9a, and the outer side surface of the second sealing ring 9b is attached to the wall surface of the cavity of the inner cavity of the external cylinder 2 to form sealing. Two second positioning grooves 9a are arranged, and a second sealing ring 9b is fixed in each second positioning groove 9 a. The upper end of the external cylinder 2 is provided with a high-pressure inflation valve 2c, high-pressure gas is inflated into the second air chamber 2a through the high-pressure inflation valve 2c, and the pressure of the high-pressure gas is 4 MPa. An oil pipe 8 for communicating the second oil chamber 2b with the lower oil chamber 1b is connected between the working cylinder 1 and the external cylinder 2. The side wall of the lower end of the working cylinder 1 is provided with an oil through hole 1c, and the oil through hole 1c is communicated with the lower oil chamber 1 b. The lower extreme of external jar 2 is fixed with the connecting seat, is provided with the oilhole on the connecting seat, crosses the oilhole and communicates with second grease chamber 2 b. One end of the oil pipe 8 is fixed on the outer side surface of the lower end of the working cylinder 1, and an inner hole of the oil pipe 8 is communicated with the oil through hole 1 c. The other end of the oil pipe 8 is inserted into the oil passing hole, and the outer side surface of the oil pipe 8 and the wall surface of the oil passing hole form sealing. The lower end of the working cylinder 1 is fixed with a base 1d, the lower end of the central shaft 6b can abut against the base 1d, and when the lower end of the central shaft 6b abuts against the base 1d, the piston valve seat 6a is located above the oil through hole 1 c. Or the upper end surface of the base 1d is provided with a convex limiting convex column, the central shaft 6b can abut against the upper end surface of the limiting convex column, and when the central shaft 6b abuts against the upper end surface of the limiting convex column, the piston valve seat 6a is positioned above the oil through hole 1c, so that the piston valve assembly 6 is prevented from blocking the oil through hole 1 c.

The first gas chamber 5a1 is filled with low pressure gas, the second gas chamber 2a is filled with high pressure gas, and the first oil chamber 5a2, the upper oil chamber 1a, the lower oil chamber 1b and the second oil chamber 2b are filled with shock absorber oil. When the piston rod 5 is located at the maximum extension stroke, the first piston 7 is located at the lowermost end of the piston chamber 5a, and the second piston 9 is located at the lowermost end of the externally arranged cylinder 2. When the piston rod 5 is compressed downwards, the volume of the upper oil chamber 1a is increased, the volume of the lower oil chamber 1b is reduced, the shock absorber oil in the lower oil chamber 1b enters the upper oil chamber 1a through the compression valve of the piston valve assembly 6, but since the piston rod 5 is located in the upper oil chamber 1a, the increased volume of the upper oil chamber 1a is smaller than the decreased volume of the lower oil chamber 1b, the extra shock absorber oil in the lower oil chamber 1b firstly enters the first oil chamber 5a2 through the oil through passage 6b2, the first piston 7 slides upwards, the gas in the first gas chamber 5a1 is compressed and generates downward pressure on the first piston 7, when the first piston 7 is abutted against the limit retaining shoulder 5b, the shock absorber oil in the lower oil chamber 1b enters the second oil chamber 2b through the oil pipe 8, the second piston 9 moves upwards and the gas in the second gas chamber 2a is compressed and creates a downward pressure on the second piston 9. The pressure generated when the gas in the first air chamber 5a1 and the second air chamber 2a is compressed and the resistance generated when the shock absorber oil passes through the compression valve of the piston valve assembly 6 jointly form the compression damping force of the shock absorber, the compression strokes of the piston rod 5 are different, the volumes of the first air chamber 5a1 and the second air chamber 2a which are compressed are different, so that the generated pressure is different, and different compression strokes are realized to generate different compression damping forces in a self-adaptive manner. When the piston rod 5 is stretched upwards, the volume of the upper oil chamber 1a is reduced, the volume of the lower oil chamber 1b is increased, the shock absorber oil in the upper oil chamber 1a enters the lower oil chamber 1b through the reset valve of the piston valve assembly 6, but because the piston rod 5 is positioned in the upper oil chamber 1a, the reduced volume of the upper oil chamber 1a is smaller than the increased volume of the lower oil chamber 1b, the gas in the second gas chamber 2a pushes the second piston 9 to move downwards, the shock absorber oil in the second oil chamber 2b enters the lower oil chamber 1b through the oil through pipe 8, the gas in the first gas chamber 5a1 pushes the first piston 7 to move downwards, the shock absorber oil in the first oil chamber 5a2 enters the lower oil chamber 1b through the oil through passage 6b2, the vacuum state in the lower oil chamber 1b is avoided, and the formation of an idle stroke is avoided.

The first air chamber 5a1 and the first oil chamber 5a2 are isolated by the first piston 7, the second air chamber 2a and the second oil chamber 2b are isolated by the second piston 9, gas in the first air chamber 5a1 and gas in the second air chamber 2a are prevented from entering the shock absorber oil, bubbles are prevented from being mixed in the shock absorber oil, and therefore the working stability of the shock absorber is improved. The piston cavity 5a is arranged in the piston rod 5, the external cylinder 2 is fixed on the outer side of the working cylinder 1, the space in the piston rod 5 and the space outside the working cylinder 1 are fully utilized, the first air chamber 5a1 and the second air chamber 2a are added to the working cylinder 1 under the condition that the length of the working cylinder 1 is not lengthened, the longitudinal installation space of the working cylinder 1 on the automobile suspension is ensured, and the shock absorber can be assembled in an automobile.

The gas pressure in the first gas chamber 5a1 and the second gas chamber 2a can be set as desired. The first and second gas chambers 5a1 and 2a may be filled with gas at equal pressure, or the first gas chamber 5a1 may be filled with gas at high pressure and the second gas chamber 2a may be filled with gas at low pressure, as conditions permit.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (10)

1. A double-air-chamber shock absorber comprises a working cylinder (1), a movable piston rod (5) is arranged in an inner cavity of the working cylinder (1), the upper end of the piston rod (5) extends out of the working cylinder (1), the lower end of the piston rod (5) is fixedly connected with a piston valve assembly (6), the piston valve assembly (6) divides the inner cavity of the working cylinder (1) into an upper oil chamber (1a) and a lower oil chamber (1b), the shock absorber is characterized in that a piston cavity (5a) is arranged in the piston rod (5), a slidable first piston (7) is arranged in the piston cavity (5a), the first piston (7) forms a seal with the cavity wall surface of the piston cavity (5a) and divides the piston cavity (5a) into a first air chamber (5a1) and a first oil chamber (5a2), and the first air chamber (5a1) is positioned above the first oil chamber (5a2), be provided with the logical oil passageway (6b2) of first grease chamber of intercommunication (5a2) and lower grease chamber (1b) on piston valve assembly (6), the outside of working cylinder (1) is fixed with external jar (2), install slidable second piston (9) in the inner chamber of external jar (2), second piston (9) form sealedly with the chamber wall face of external jar (2) inner chamber and separate the inner chamber of external jar (2) for second air chamber (2a) and second grease chamber (2b), second air chamber (2a) are located the top of second grease chamber (2b), be connected with between working cylinder (1) and external jar (2) and be used for communicateing logical oil pipe (8) of second grease chamber (2b) and lower grease chamber (1 b).

2. Double-chamber shock absorber according to claim 1, wherein the chamber wall of the piston chamber (5a) is provided with a protruding limit stop shoulder (5b), the limit stop shoulder (5b) being located above the first piston (7), the first piston (7) being able to abut against the limit stop shoulder (5 b).

3. The double air chamber shock absorber according to claim 1 or 2, wherein a first positioning groove (7a) is arranged on the outer side surface of the first piston (7), a first sealing ring (7b) is fixed in the first positioning groove (7a), and the outer side surface of the first sealing ring (7b) abuts against the wall surface of the piston cavity (5a) to form a seal; the outer side surface of the second piston (9) is provided with a second positioning groove (9a), a second sealing ring (9b) is fixed in the second positioning groove (9a), and the outer side surface of the second sealing ring (9b) is attached to the wall surface of the cavity of the inner cavity of the external cylinder (2) to form sealing.

4. The double air chamber shock absorber according to claim 1 or 2, wherein the piston valve assembly (6) comprises a piston valve seat (6a), a center hole (6a1) is provided at the center of the piston valve seat (6a), a center shaft (6b) is fixedly connected in the center hole (6a1), the oil passage (6b2) is provided on the center shaft (6b), and the upper end of the center shaft (6b) is inserted into the piston cavity (5a) of the piston rod (5) and fixed.

5. The double air chamber shock absorber as set forth in claim 4, wherein the working cylinder (1) has an oil through hole (1c) in a side wall of a lower end thereof, the inner bore of the oil through pipe (8) communicates with the oil through hole (1c), a base (1d) is fixed to the lower end of the working cylinder (1), the lower end of the center shaft (6b) protrudes through the center hole (6a1), the lower end of the center shaft (6b) can abut against the base (1d), and the piston valve seat (6a) is located above the oil through hole (1c) when the lower end of the center shaft (6b) abuts against the base (1 d).

6. Double air chamber shock absorber according to claim 4, characterized in that on the outer side of the upper end of the central shaft (6b) above the piston valve seat (6a) is arranged a stop ring (6b1), the upper end face of the piston valve seat (6a) abutting against the stop ring (6b 1).

7. Double air chamber shock absorber according to claim 6, wherein the lower end face of said piston rod (5) abuts against the upper end face of the stop ring (6b 1).

8. Double air chamber shock absorber according to claim 7, wherein the lower end of said piston rod (5) is welded to a stop ring (6b 1).

9. The double air chamber shock absorber according to claim 1 or 2, characterized in that a fixed mount (3) is connected between the outer cylinder (2) and the working cylinder (1).

10. A shock absorber with double air chamber according to claim 1 or 2, wherein the upper end of the piston rod (5) is provided with a valve core (5c) and the upper end of the externally arranged cylinder (2) is provided with a high pressure charging valve (2 c).

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