JP2011163439A - Shock absorber with air spring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a shock absorber from causing circumferential pollution even if oil leakage from a shock absorber body arises owing to failure or the like of a sealing member and to prevent shortage of working fluid in the shock absorber body. <P>SOLUTION: In the shock absorber with an air spring which has the shock absorber body SA which has a cylinder body 1 and a rod body 2 and conducts damping action and an air chamber AC which defines an air chamber A outside the shock absorber body SA and produces an air spring force when the air chamber A is compressed and decompressed with the cylinder body 1 composed of an inner tube 11 and an outer tube 12 and the air chamber AC composed of a shell 21, a diaphragm 23 and a piston pipe 22, the clearance A1 defined between the piston pipe 22 and the outer tube 12 is brought into fluid communication with a reservoir R defined between the inner tube 11 and the outer tube 12 via a communication hole 12a perforated in the outer tube 12. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a shock absorber with an air spring, and more particularly, to an improvement of a shock absorber with an air spring in which a shock absorber body having a damping action during expansion and contraction has an air chamber that functions as an air spring by expansion and contraction of the air chamber.

  There have been various proposals so far for shock absorbers with air springs. Among them, for example, in the proposal disclosed in Japanese Patent Application Laid-Open No. H10-133707, as is the case with shock absorbers with almost all kinds of air springs, The shock absorber main body that has a damping action during the expansion and contraction operation has an air chamber that functions as an air spring by expansion and contraction of the air chamber.

  That is, first, the shock absorber body can be extended and retracted by inserting and retracting a rod body that is an upper end side member into a cylinder body that is a lower end side member. A predetermined damping action is realized by the damping means.

  Incidentally, in the shock absorber with an air spring disclosed in Patent Document 1, the shock absorber main body is disposed so that the cylinder body defines an inner cylinder and a reservoir communicating with the inside of the inner cylinder outside the inner cylinder. It is a multi-cylinder type having an outer cylinder, and has a damping means in the inner cylinder, and this damping means realizes a predetermined damping action at the time of telescopic operation in the shock absorber body in which the rod body protrudes and retracts from the cylinder body. .

  The air chamber, on the other hand, forms an air chamber with a diaphragm made of rubber or the like, and this diaphragm is arranged with a gap so that the lower end portion is folded so as to surround the cylinder body in the shock absorber body from the outside. It is fixedly connected in an airtight state to the upper end portion of the provided piston pipe, which is a cylindrical body, using a metal fastening band or the like.

  Note that the lower end portion of the piston pipe is drawn and fixedly connected to the outer periphery of the cylinder body in an airtight state by welding or the like.

  The upper end of the diaphragm is fixedly connected to the lower end of the shell that is fixedly held in an airtight state on the rod body side, and is fixedly connected to the lower end of the shell in the airtight state by using a metal fastening band or the like. Is done.

  Therefore, in this air chamber, when the rod body moves in and out of the cylinder body by the expansion and contraction operation of the shock absorber main body, the air chamber has an air spring force that expands and contracts and acts as a reaction force.

  As a result, when the shock absorber with an air spring disclosed in Patent Document 1 described above is an air suspension mounted on a vehicle, for example, the cylinder body is connected to the wheel side of the vehicle and the rod body is a vehicle body in the vehicle. In the shock absorber body connected to the side, the air chamber exerts a predetermined damping action when expanding and contracting due to vibration input from the road surface on which the vehicle travels, and the air chamber exerts air spring force due to expansion and contraction of the air chamber. The shock absorber body is urged in the extending direction to maintain the vehicle height.

Japanese Patent Laid-Open No. 2000-186736 (see paragraph 0012 in FIG. 1, FIG. 1)

  However, in the shock absorber with an air spring disclosed in Patent Document 1 described above, there is basically a problem in that the shock absorber body realizes a predetermined damping action and the air chamber functions as an air spring. Although there is no, there is a possibility that it is pointed out that there is a minor defect when looking at the actual situation of use.

  That is, when the shock absorber with an air spring is used as an air suspension and is mounted on a vehicle, the shock absorber main body repeatedly expands and contracts while the vehicle is running, and thus becomes so-called hot. When near the engine in the vehicle, the shock absorber body can be quite hot, for example, close to 150 degrees.

  At this time, each component constituting the shock absorber body is set to exhibit a predetermined function without being deteriorated by the above-described heat, and in particular, a component made of metal has a permanent setting function. To maintain.

  However, the seal member that prevents the so-called leakage of the working fluid that is the working fluid contained in the shock absorber body is often made of a rubber material, and the seal member made of the rubber material has an optimum temperature environment. Therefore, the seal member in different temperature environments, such as too high or too low, will not perform its setting function due to deterioration, etc. Cause leakage.

  By the way, in the shock absorber with the air spring, the air chamber forming the air chamber is composed of a diaphragm, a shell, and a piston pipe, and is disposed so as to surround the shock absorber main body from the outside. Mechanical failures can be confirmed by visual inspection from the outside, and can be dealt with appropriately.

  However, the failure of the sealing member, particularly the sealing member disposed at the protruding end portion of the rod body in the cylinder body, is concealed in the air chamber so that the protruding end portion of the cylinder body is concealed. Disable visual confirmation from outside.

  Therefore, when this shock absorber with an air spring is used as, for example, an air suspension in a vehicle, it has been a common practice to check whether oil leakage has occurred in a so-called periodic inspection in a vehicle-mounted state. However, the mileage of the vehicle and the usage time of the shock absorber with air springs, which are the elements that realize this periodic inspection, vary depending on the usage status of the vehicle, and it is actually not known until oil leaks. It is.

  Therefore, the present invention has been created in view of the above-described present situation, and the object of the invention is not only to exhibit a predetermined function but also from a shock absorber body due to a failure of a seal member or the like. Air springs that are optimal for expecting improved versatility, not only by causing the surrounding dirt to appear, but also by causing the working fluid to be insufficient in the shock absorber body. It is to provide a shock absorber.

  In order to achieve the above-described object, the structure of the shock absorber with an air spring according to the present invention basically includes a cylinder body that is a lower end side member, and an upper end side member that is inserted and retracted into the cylinder body. A shock absorber body having a predetermined damping action, and an upper end portion held by the rod body side and a lower end portion connected to the cylinder body, and an air chamber outside the shock absorber body. An air chamber having an air spring force when the air chamber expands and contracts, and an inner cylinder that fills the working fluid while the cylinder body allows the rod body to be inserted and retracted, and An outer cylinder that is disposed outside the inner cylinder and communicates with the inner cylinder to define a reservoir that allows inflow of the working fluid. The shell that holds the In a shock absorber with an air spring comprising a piston pipe for connecting the lower end to the body and a diaphragm for connecting the lower end to the upper end of the piston pipe and connecting the upper end to the lower end of the shell, It is assumed that a gap appears between the piston pipe and the outer cylinder, and the gap is communicated with the reservoir via the recovery means while allowing the working fluid leaking from the shock absorber body to flow in.

  Therefore, in the present invention, when the working fluid accommodated in the cylinder body leaks out of the cylinder body due to a reduction in the function of the seal member in the cylinder body constituting the shock absorber body, this oil leakage The working fluid that has flowed into the gap that appears between the piston pipe that forms the air chamber and the outer cylinder of the cylinder body that forms the shock absorber body along with the outer periphery of the cylinder body Is recovered in the reservoir via the recovery means.

  Therefore, according to the present invention, even if the working fluid leaks in the shock absorber main body, the shock absorber main body is not short of the working fluid for realizing the predetermined damping action, and the working fluid Peripheral dirt due to leakage is not expressed.

  At this time, in the case where the collecting means is formed of a communicating hole opened in the outer cylinder, the configuration is simplified as compared with the case where a sensor or pumps are provided as the collecting means.

  In the case where the collecting means is formed with a communicating hole opened in the outer cylinder, it is sufficient to open the communicating hole in the outer cylinder in the existing shock absorber with an air spring when the invention is put into practice. It is possible to avoid an unnecessarily high product cost.

  In addition, according to the present invention, it is possible to easily manage the accuracy of the tightening allowance in the packing of the packing in the so-called seal portion which is the upper end portion of the cylinder body forming the shock absorber body. This can be overlooked even if leakage occurs, and it can be overlooked even if leakage of the working fluid is caused, which can make it possible to omit packing, etc., contributing to lower product costs. To do.

It is a cross-sectional front view which shows the shock absorber with an air spring by this invention halfway. It is a fragmentary sectional view which expands and shows the protrusion end part of the rod body in the cylinder body which constitutes a shock absorber main part, and (A) shows the part composition used regularly, and (B) shows arrangement of an internal part. The state where the setting is omitted is shown. It is a partial longitudinal cross-sectional view which expands and shows an oil leak collection | recovery means.

  Hereinafter, the present invention will be described based on the illustrated embodiment. A shock absorber with an air spring according to the present invention is integrally held by a shock absorber main body SA and the shock absorber main body SA as shown in FIG. The shock absorber main body SA exhibits a damper function, and the air chamber AC has an air chamber A in which the air chamber AC expands and contracts to exert an air spring force.

  Incidentally, in the shock absorber with an air spring of the present invention, the shock absorber main body SA is configured not to make the damping action variable in the drawing, but instead, it is made to make the damping action variable. May be.

  Further, in the shock absorber with an air spring of the present invention, the air chamber AC is configured to vary the air pressure in the air chamber A in the drawing, but instead, the air pressure in the air chamber A is variable. It may be configured not to be.

  First, the shock absorber main body SA exhibits a damper function, that is, implements a predetermined damping action. The shock absorber main body SA has a cylinder body 1 as a lower end member and an upper end member in the cylinder body 1. The rod body 2 is inserted so as to be able to appear and retract.

  At this time, the shock absorber main body SA shown in the figure is a double cylinder type. Therefore, the cylinder body 1 supplies hydraulic oil as a working fluid while allowing the tip end side, which is the lower end side of the rod body 2 in the drawing, to be inserted and retracted. An inner cylinder 11 to be filled and an outer cylinder 12 which is disposed outside the inner cylinder 11 and communicates with the inside of the inner cylinder 11 between the inner cylinder 11 and defines a reservoir R which allows hydraulic oil to flow in and out. It has.

  The reservoir R contains an appropriate amount of hydraulic oil, and has an air chamber (not shown) that expands and contracts when the shock absorber main body SA expands and contracts above the hydraulic oil surface O. In the embodiment shown in the drawing, the height position is determined in relation to the collection means described later.

  In the cylinder body 1, the lower end opening of the outer cylinder 12 is closed by welding the bottom member 13 (see reference M), and the bottom member 13 has the base valve 4 closing the lower end opening of the inner cylinder 11 as the inner bottom. Place.

  Incidentally, when the shock absorber with an air spring according to the present invention constitutes an air suspension in a vehicle, the bottom member 13 has a bracket (not shown) integrally, and the bracket is attached to the axle or the axle side. By connecting, the cylinder body 1 is connected to the wheel side in the vehicle.

  On the other hand, the base valve unit 4 has a pressure side damping means (not shown), and the pressure side damping means has a pressure side damping valve and a pressure side check valve in parallel with the pressure side damping valve.

  In this compression side damping means, the compression side damping valve realizes a predetermined damping action when the hydraulic oil in the inner cylinder 11 flows out to the reservoir R, and the check valve is used for the hydraulic oil in the inner cylinder 11. The outflow to the reservoir R is prevented, and the hydraulic oil in the reservoir R is allowed to flow into the inner cylinder 11.

  Further, in the cylinder body 1, a piston body 3 is slidably accommodated in the inner cylinder 11, and the piston body 3 has an upper chamber R <b> 1 above the piston body 3 in the inner cylinder 11. A lower chamber R2 that is below the piston body 3 is defined.

  The rod body 2 is connected to the piston body 3 at the distal end portion as the lower end portion in the drawing and to the base end portion as the upper end portion in the drawing at an arbitrary portion. The piston body 3 slides in the cylinder body 1 when the SA is extended or contracted, that is, when the rod body 2 protrudes and protrudes from the cylinder body 1.

  Incidentally, when the shock absorber with an air spring according to the present invention constitutes an air suspension in a vehicle, the base end portion of the rod body 2 constitutes a mount (not shown) as a connection structure to the vehicle body side of the air suspension. The piston body 3 includes an extension side damping means (not shown), and the extension side damping means is connected to the extension side damping valve and the extension side damping valve. Side check valve.

  The extension side damping valve implements a predetermined damping action when the hydraulic oil in the upper chamber R1 flows into the lower chamber R2, and the check valve prevents the hydraulic oil in the upper chamber R1 from flowing out into the lower chamber R2. The hydraulic oil in the lower chamber R2 is allowed to flow into the upper chamber R1.

  The base valve portion 4 described above is disposed below the lower chamber R2 in the inner cylinder 11, that is, below the lower end of the inner cylinder 11 in the drawing.

  Further, in the cylinder body 1, as shown in FIG. 2, the upper end opening of the outer cylinder 12 and the upper end opening of the inner cylinder 11 are closed by the rod guide 14, and the rod guide 14 is connected to the shaft core portion. The rod body 2 is penetrated under the arrangement of the bush 15.

  At this time, in the illustrated embodiment, the lower end of the seal case 16 is fitted inside the upper end of the outer cylinder 12, and the lower end of the seal case 16 is welded to the outer cylinder 12 (reference number M). However, instead of this, the outer periphery of the upper end portion of the outer cylinder 12 for fitting the lower end portion of the seal case 16 inside is rolled and crimped or the like. Furthermore, both welding and caulking may be used in combination.

  Further, in the illustrated embodiment, the seal case 16 has a gap that allows passage of hydraulic oil in the shaft core portion and allows the rod body 2 to pass therethrough and is connected to the inside of the upper end portion of the outer cylinder 12. Previously, the rod guide 14 that allows the rod body 2 to penetrate the shaft core portion is fitted inside the lower end portion.

  Therefore, while the upper end opening of the inner cylinder 11 is in a state of being directly closed by the rod guide 14, the upper end opening of the outer cylinder 12 is in a position of being closed by the rod guide 14 under the seal case 16.

  2A, reference numeral 17 denotes a packing, and the packing 17 scrapes off dust adhering to the outer periphery of the rod body 2 outside the cylinder body 1 to remove dust. Is prevented from entering the inside of the cylinder body 1, and the lubricating oil film on the inside of the cylinder body 1 and adhering to the outer periphery of the rod body 2 is scraped off so that the hydraulic oil flows out of the cylinder body 1. Stop.

  2A, reference numeral 18 denotes a packing plate. The packing plate 18 fixes the packing 17 in a predetermined position and locks the upper end of the lower biasing member 19. To do.

  The urging member 19 is disposed between the packing plate 18 and the rod guide 14 and urges the rod guide 14 downward, that is, so as to project the rod guide 14 from within the seal case 16.

  Therefore, in the seal case 16 that holds the rod guide 14 under the arrangement of the urging member 19, the rod guide 14 is first inserted when the lower end portion is fitted inside the upper end portion of the outer cylinder 12. Then, the upper end opening of the inner cylinder 11 is closed, and then the urging member 19 contracts, so that the lower end portion of the seal case 16 can be fitted inside the upper end portion of the outer cylinder 12 and integrated. .

  On the other hand, as shown in FIG. 2, the rod guide 14 is provided at the outer peripheral side (not shown), that is, at a portion closing the upper portion of the reservoir R between the inner cylinder 11 and the outer cylinder 12. A passage that allows communication between the upper end side and the lower end side, that is, a drain passage 14a, and a portion that closes the drain passage 14a on the inner peripheral side portion (not shown), that is, the upper end opening of the inner cylinder 11 It has a notch passage 14b that communicates upward.

  Therefore, in the rod guide 14, the hydraulic oil in the inner cylinder 11 and attached to the outer periphery of the rod body 2 passes through the sliding gap between the rod body 2 and the bush 15. The hydraulic oil that has flowed upward and has been overflowed on the rod guide 14 is allowed to flow into the reservoir R through the notch passage 14b and the drain passage 14a, that is, be recovered.

  Next, as shown in FIG. 1, the air chamber AC is held at the upper end portion on the rod body 2 side in the shock absorber main body SA, and the lower end portion is connected to the cylinder body 1 in the shock absorber main body SA. An air chamber A is defined outside the SA, and an air spring force is provided when the air chamber A expands and contracts to urge the shock absorber body SA in the extending direction.

  That is, the air chamber AC is shown in the figure, and includes a shell 21 that holds the upper end portion on the rod body 2 side, a piston pipe 22 that connects the lower end portion to the cylinder body 1, and an upper end portion of the piston pipe 22. And a diaphragm 23 for connecting the lower end to the lower end of the shell 21.

  At this time, the shell 21 and the piston pipe 22 are made of a metal material that does not easily deform due to a predetermined mechanical strength, that is, a change in atmospheric pressure in the air chamber A. In particular, the piston pipe 22 has a diaphragm 23 closely in contact with its outer periphery. The diaphragm 23 is formed of an elastic material such as rubber that is elastically deformed in response to a change in atmospheric pressure in the air chamber A.

  The upper end portion of the shell 21 is connected to a nut portion N that constitutes a mount that is a connection structure to the vehicle body described above, for example, by welding (see symbol M), and connected in an airtight state.

  The piston pipe 22 has a lower end portion that is drawn and welded to the outer periphery of the outer cylinder 12 that constitutes the shock absorber body 1 (see reference M), and is connected in an airtight state. A gap A1 having an appropriate width appears between the outer cylinder 12 and the outer cylinder 12.

  Then, as shown in the figure, the upper end position of the piston pipe 22 is blown out from the seal case 16 portion, assuming that the upper end position of the rod body 2 in the shock absorber main body SA is higher than the upper end position of the seal case 16. Thus, it is considered that the hydraulic oil flowing out is reliably guided to the gap A1 described later.

  Incidentally, the illustrated piston pipe 22 has a socket 24 in the vicinity of the lower end by brazing or the like, and this socket 24 is in the air chamber AC, that is, the air chamber A and the atmosphere through the gap A1. For example, when a pressurized air supply / exhaust source is connected to the socket 24, the level of air pressure in the air chamber A can be adjusted.

  Although not shown, the socket 24 may be provided on the shell 21 instead of being provided on the piston pipe 22 as shown in the figure. Of course, it may be possible to realize the atmospheric pressure adjustment in the air chamber A.

  Incidentally, when the product is shipped with the socket 24 provided, although not shown, a sealing plug is fitted to prevent intrusion of dust from the outside. It is important to prevent leakage of hydraulic oil as a working fluid contained in the SA.

  The diaphragm 23 is also referred to as a rolling diaphragm. The diaphragm 23 is generally formed in a substantially cylindrical shape, and the upper end of the drawn shape is formed on the outer periphery of the lower end of the shell 21 using a metal fastening band 25. Connected together.

  At this time, the upper end position of the diaphragm 23 is set so as to protrude upward from the upper end position of the piston pipe 22 as shown in the figure, so that the hydraulic oil flowing out from the seal case 16 part flows out of the piston pipe 22. Even if the situation exceeds the upper end, this can be prevented and the hydraulic oil can be reliably guided to the gap A1 described later.

  And in this diaphragm 23, the lower end part turned back inside is integrally connected to the outer periphery of the upper end part of the piston pipe 22 under the use of the fastening band 25.

  As a result, in this diaphragm 23, the folded portion (not shown) positioned outside the piston pipe 22 during the expansion / contraction operation in which the rod body 2 protrudes and retracts with respect to the cylinder body 1 in the shock absorber body SA is provided in the piston pipe 22. Ascends and descends along the outer periphery.

  As a result, in the air chamber AC, expansion / contraction corresponding to the protrusion / disintegration integral of the rod body 2 when the rod body 2 protrudes / projects from the cylinder body 1 is embodied in the air chamber A, and a predetermined air spring force is obtained. To express.

  The shock absorber with an air spring according to the present invention having the air chamber AC formed as described above integrally with the shock absorber main body SA has a collecting means for collecting the leakage oil as the working oil accumulated in the gap A1. Do it.

  That is, in the shock absorber with an air spring according to the present invention, even if the hydraulic oil leaks from the protruding and retracting end of the rod body 2 in the cylinder body 1 in the shock absorber main body SA, the oil leakage of the cylinder body 1 It flows along the outer periphery and flows into the gap A1 and is collected in the reservoir R in the cylinder body 1 through the collecting means.

  That is, in the shock absorber main body SA, a seal member (not shown and not shown) for avoiding leakage of the working oil as the working fluid stored in the cylinder body 1 to the outside is appropriately disposed. However, if this seal member deteriorates due to, for example, high heat in the shock absorber main body SA and the set sealability is no longer ensured, the hydraulic oil flows out to cross outside the seal member. That is, oil leaks and flows out.

  At this time, in the shock absorber body SA having the air chamber AC on the outer peripheral side, as described above, the protruding end of the rod body 2 in the cylinder body 1 is covered and the hydraulic oil leaks from the protruding end. Cannot be confirmed visually.

  And if leakage of hydraulic oil can be confirmed by using sensors, it can be dealt with by disassembling the oil before it becomes unimportant, but the sensors are not used or can not be seen visually. In such a case, it is conceivable that the above-described leakage of oil accumulates in the gap A1 in the air chamber AC, that is, the shock absorber main body SA becomes inoperable due to insufficient hydraulic oil in the shock absorber main body SA.

  Therefore, in the present invention, even if there is oil leakage, the oil leakage can be recovered in the shock absorber main body 1 by the recovery means, that is, in the cylinder body 1. In this case, it is possible to realize a predetermined damping action without causing a shortage of hydraulic oil, and to prevent peripheral contamination due to so-called overflow of leaked oil.

  At this time, as shown in FIG. 3, the collecting means includes a communicating hole 12a opened in the outer cylinder 12 of the cylinder body 1 constituting the shock absorber body SA (see FIG. 1). Communication between the gap A1 in the chamber AC (see FIG. 1) and the reservoir R defined in the cylinder body 1 is allowed.

  The communication hole 12a is positioned below the socket 24 as shown in the figure, and flows into the outside, for example, a pressurized air supply / discharge source via the socket 24 when hydraulic oil flows into the gap A1. We are careful not to get it.

  Incidentally, the oil level O in the reservoir R is set so as to be below the communication hole 12a as the collecting means even when the shock absorber main body SA is in the most contracted state and reaches the highest level in the reservoir R. .

  In view of the above, in the shock absorber body SA, the so-called seal portion, which is the protruding end portion of the cylinder body 1, is normally formed as shown in FIG. 2 (A). First, it is not necessary to set the sealing function in the packing 17 to high performance. Therefore, when the packing 17 is formed, precise dimensional management is not required, and it is possible to keep the component cost low and high. Since the sealing property is not required, that is, the high sealing property is not exhibited, the telescopic operation property in the shock absorber body SA can be improved.

  Further, in the shock absorber main body SA, even if the deterioration of the packing 17 in the seal portion is caused and leakage of the hydraulic oil is caused, this can be overlooked, and even if the leakage of hydraulic oil is caused, it can be overlooked. Therefore, the expansion / contraction operability in the shock absorber can be improved.

  Accordingly, in the shock absorber main body SA, the structure of the seal portion that is the protruding and retracting end portion of the cylinder body 1 is replaced with the above-described configuration, and as shown in FIG. Alternatively, the arrangement of the packing plate 18 and the urging member 19 may be omitted, and the rod guide 14 may be simply covered with the seal case 16.

  In this case, further parts can be omitted from the seal portion which is the protruding and retracting end portion of the cylinder body 1, which contributes to a reduction in the product cost and further improves the telescopic operation in the shock absorber.

  Further, the embodiment of the present invention can be realized by simply opening the communication hole 12a in the outer cylinder 12 constituting the cylinder body 1 as a collecting means. Since no major design changes are required, it is possible to prevent an unreasonable increase in product costs.

  In the above description, the case where the shock absorber with an air spring according to the present invention is used as an air suspension mounted on a vehicle has been described as an example. However, according to the configuration of the present invention, for example, the tilt operation is performed in a large vehicle. It may be embodied in a cab suspension that absorbs vibrations input to the cabin, and in this case, the operational effects are not different.

  The upper end side is connected to the vehicle body side of the vehicle and the lower end side is connected to the wheel side of the vehicle, which is mounted on the vehicle, and is suitable for improving the ride comfort in the vehicle by absorbing vibration input to the vehicle body.

DESCRIPTION OF SYMBOLS 1 Cylinder body 2 Rod body 3 Piston body 4 Base valve part 11 Inner cylinder 12 Outer cylinder 12a Communication hole which is collection means 13 Bottom member 14 Rod guide 14a Drain flow path 14b Notch path 15 Bush 16 Seal case 17 Packing 18 Packing plate 19 Energizing member 21 Shell 22 Piston pipe 23 Diaphragm 24 Socket 25 Tightening band A Air chamber A1 Gap AC Air chamber M Welding N Nut portion O Oil level R Reservoir R1 Upper chamber R2 Lower chamber SA Buffer body

Claims (4)

  A shock absorber body which has a cylinder body which is a lower end side member and a rod body which is inserted into the cylinder body so as to be able to protrude and retract and which is an upper end side member, and has a predetermined damping action, and the upper end portion is the rod described above An air chamber which is held on the body side and has a lower end connected to the cylinder body to define an air chamber outside the shock absorber body and has an air spring force when the air chamber expands and contracts. The cylinder body is disposed between the inner cylinder that fills the working fluid while allowing the rod body to be inserted and retracted, and the inner cylinder that is disposed outside the inner cylinder and communicates with the inside of the inner cylinder. An outer cylinder that defines a reservoir that allows inflow, a shell in which an air chamber holds the upper end on the rod body side, a piston pipe that connects the lower end to the cylinder body, and a piston pipe of the piston pipe Connect the lower end to the upper end. And a shock absorber with an air spring having an upper end connected to the lower end of the shell, and a gap appears between the piston pipe and the outer cylinder. A shock absorber with an air spring, wherein the working fluid leaking from the main body of the container is communicated with the reservoir through the recovery means while flowing in.   The cylinder body has a rod guide that closes the upper end opening of the inner cylinder and closes the upper end opening of the outer cylinder to allow the rod body to pass through the shaft core, and the rod guide has a lower end on the outer peripheral side. It has a drain channel that opens into the reservoir and opens the upper end to the upper end of the rod guide. The upper part of the rod guide is connected to the upper end of the outer cylinder and penetrates the rod body through the shaft core. The shock absorber with an air spring according to claim 1, wherein the shock absorber is covered with a seal case, and the rod case is inserted through the seal case with a gap in the shaft core portion.   The piston pipe or the shell is connected to the piston pipe and has a socket that allows communication between the air chamber in the air chamber and the atmosphere, and the gap communicates with the reservoir below the socket. The shock absorber with an air spring according to claim 1 or 2, wherein a collecting means to be positioned is positioned.   2. The recovery means is formed by a communication hole that is opened in the outer cylinder and allows communication between the gap and the reservoir, and an oil level in the reservoir is positioned below the communication hole. 4. A shock absorber with an air spring according to claim 2 or claim 3.

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