JP3148349U - accumulator - Google Patents

Abstract

An accumulator capable of being miniaturized is provided. A bellows mechanism 50 housed in a pressure vessel 10 of an accumulator 1 includes a seal member 53 provided on a bellows cap 52 attached to the other open end of a metal bellows 51. 60, and a seal 61 formed of an elastic resin material provided on the outer surface of the metal member 60. The seal 61 includes a covering portion 63 that covers the metal member 60, and a communication hole of the cylindrical member 26. 33 has a liquid sealing part 64 that seals the peripheral end surface 26a, a sealing surface 65 of the liquid sealing part 64, and an outer surface of the covering part 63, and an inclined part 66 that is continuous with an inclined or curved surface having a predetermined angle. is doing. [Selection] Figure 1

Description

  The present invention relates to a pressure vessel such as an accumulator used in a hydraulic circuit, and more particularly to one that can be miniaturized.

  Metal bellows type accumulators (accumulation / buffer devices) are used in hydraulic circuits such as hydraulic circuits of hydraulic control devices and hydraulic circuits using shock absorbers. A metal bellows type accumulator is generally a pressure vessel formed by joining an outer shell member and a lid by welding or the like, and a bellows and a trapezoidal cross-section seal are attached to a metal member by a vulcanized adhesive. A bellows mechanism constituted by a partition plate (bellows cap) having a bonded seal member is provided. In such an accumulator, the inside of the pressure vessel is partitioned into a gas chamber and a liquid chamber (oil chamber) by a bellows mechanism. Further, the pressure vessel is configured to buffer the pressure fluctuation of the liquid flowing into the hydraulic circuit and the accumulator by the expansion and contraction action of the gas in the gas chamber accompanying the expansion and contraction of the bellows mechanism.

In the accumulator, when the pressure in the liquid chamber becomes lower than the pressure in the gas chamber, the seal member covers the opening provided in the communicating portion that continuously connects the hydraulic circuit and the oil chamber, and the Close the opening to close the opening. By closing the opening with the seal member, a certain amount of liquid is sealed in the liquid chamber, and the balance between the sealed liquid and the gas in the gas chamber prevents excessive deformation of the bellows toward the liquid chamber. Is known (see, for example, Patent Document 1).
JP 2003-172301 A

  The accumulator described above has the following problems. That is, when the accumulator is elastically deformed by the seal member being in close contact with the communication portion, the elastically deformed seal member escapes in the side surface direction (outward direction) of the seal member. However, since the seal is bonded to the metal member by vulcanization, the surface bonded to the metal member of the seal is fixed to the metal member even when the side surface of the seal protrudes due to elastic stress. Yes.

  In this state, when the elastic deformation of the seal member by repeated contact with the communication portion is repeated, the protrusion of the side surface of the seal member is followed and the adhesive surface of the seal member is also elastically deformed outward (for example, FIG. 6). Therefore, shear stress is intermittently applied between the bonding surface and the metal member. Such an intermittently applied shear stress is applied more to the end of the bonded seal member.

  Due to the shear stress, the seal and the metal member are gradually separated from the end portion. As described above, due to the decrease in the seal member, there is a risk of a decrease in sealability due to the seal member, peeling of the seal, and the like.

  In addition, the capacity of the accumulator decreases when the volume of an internal component such as a seal member or a bellows cap is large. That is, there is a possibility that the accumulator becomes large in order to obtain the required capacity of the accumulator. In particular, such an accumulator is provided on a hydraulic circuit. However, a space is required for the arrangement, and there is a problem that the arrangement space is increased by increasing the accumulator.

  Accordingly, an object of the present invention is to provide an accumulator that can be miniaturized.

  In order to solve the above problems and achieve the object, the accumulator of the present invention is configured as follows.

  A bottomed cylindrical outer shell member, and a pressure vessel including a lid body that closes an opening of the outer shell member and has an inflow hole through which liquid can flow into and out of the outer shell member; A metal bellows formed to be stretchable along the inner wall surface of the pressure vessel, and a partition plate that is provided on the metal bellows and moves following the metal bellows along the inner wall surface of the pressure vessel. A bellows mechanism that partitions the inside of the pressure vessel into a liquid chamber capable of flowing in and out of the liquid and a gas chamber capable of enclosing gas by a bellows and a partition plate, and a disc-like shape provided on the liquid chamber side of the partition plate A metal member, a covering portion covering the surface of the metal member, and protruding from the covering portion, and continuously provided at least one of the covering portion, the inclined portion, and the curved surface portion, and the liquid chamber is formed in the inflow hole. And liquid that can be sealed A seal member having a part, characterized in that it comprises a.

  According to the present invention, the accumulator can be reduced in size.

  1 is a longitudinal sectional view showing a configuration of an accumulator 1 according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing movement of a bellows mechanism 50 of the accumulator 1, and FIG. 3 is a main part of the bellows mechanism 50. FIG. 1 and 2, G represents a gas chamber (air chamber), L represents an oil chamber (liquid chamber), and S represents a welded portion (joined portion) of the pressure vessel 10.

  As shown in FIGS. 1 and 2, the accumulator 1 includes a pressure vessel 10 and a bellows mechanism 50 accommodated in the pressure vessel 10. Such an accumulator 1 is connected to, for example, a brake hydraulic circuit for a vehicle.

  The pressure vessel 10 includes a steel pipe 11 formed of a bottomed cylindrical steel material that is an outer shell member, and a lid 13 that is coupled to an opening 12 of the steel pipe 11. Moreover, the pressure vessel 10 is comprised by welding the steel pipe 11 and the cover body 13 with the welding part (joining part) S, for example. The pressure vessel 10 has therein a gas chamber G formed by the steel pipe 11 and the bellows mechanism 50 and an oil chamber L formed by the lid 13 and the bellows mechanism 50.

  The steel pipe 11 has a pipe part 15 and an end part (hereinafter referred to as “bottom part”, which is located at the upper part in FIGS. 1 and 2) 16, for example, by deep drawing using a press. The steel pipe 11 may be subjected to heat treatment such as annealing after deep drawing. In the steel pipe 11, the opening 12 is located on one end (the other side of the bottom 16) side of the pipe part 15.

  In the steel pipe 11, an inner wall surface 17 is formed by an inner peripheral surface 15 a of the pipe portion 15 and an inner surface 16 a of the bottom portion 16. A gas chamber G is formed by a part of the lid 13, the inner wall surface 17 and the bellows mechanism 50. Note that the lid 13 is inserted into the opening 12, and the lid 13 is welded at the welded portion S.

  A circular through hole 18 is formed in the bottom portion 16. The through-hole 18 is hermetically closed to the gas sealing plug 19 by means of welding or the like after the gas is sealed. Further, the bottom portion 16 is provided with a cover 20 having a hexagonal cross section, for example, outside the through hole 18.

  The lid body 13 includes a lid body 21 formed in a disc shape, a port portion 22 provided on the axis of the lid body 21, and a port portion 22 of the lid body 21. A surface 23 and a second surface 24 opposite to the first surface 23 are provided. Further, the lid body 13 includes a cylindrical member 26 joined on the axis of the lid body 21 and on the second surface 24 side by welding, for example.

  The lid body 21 has an outer diameter at least such that the second surface 24 side is located inside the steel pipe 11 and the first surface 23 is exposed to the outside of the steel pipe 11 by being inserted into the opening 12. It has a diameter. Further, on the second surface 24 side of the side surface portion 27 of the lid body 21, a seal groove 29 into which a ring-shaped blocking seal 28 formed of a resin material or the like is inserted is provided.

  More specifically, the lid body 21 is formed such that the first surface 23 side has a larger diameter than the inner peripheral diameter of the tube portion 15, and the second surface 24 side has a smaller diameter than the inner peripheral diameter of the tube portion 15. . Moreover, the welding part S provided with the curved surface part 12a of the steel pipe 11 is provided in the 1st surface 23 side rather than the seal groove 29 of the side surface of the cover body 21 and melt | dissolves at the time of welding. Here, the blocking seal 28 is formed so as to be able to block spatter (welded pieces or the like) generated when the curved surface portion 12a and the welded portion S are welded. There is no entry into. The blocking seal 28 and the seal groove 29 are exposed to the gas chamber G.

The port portion 22 is provided with an oil passage hole 30 through which the oil chamber L and hydraulic oil flow in and out. Moreover, the port part 22 is connected on piping of the hydraulic circuit which is not illustrated, for example.
The cylindrical member 26 has a hollow portion 31 formed therein and is continuous with the oil passage hole 30. In addition, a communication hole (inflow hole) 33 that connects the cavity 31 and the oil chamber L is provided in the end surface portion 32 of the cylindrical member 26. Further, the cylindrical member 26 has a surface facing the bellows mechanism 50 (hereinafter referred to as “end surface 26a”) with a surface roughness having a predetermined accuracy. That is, the end surface 26 a of the cylindrical member 26 has a surface roughness that allows the oil chamber L to be liquid-sealed from the cavity portion 31 of the cylindrical member 26 by contacting a seal member 53 described later.

  The bellows mechanism 50 is formed in a cylindrical shape, and one end of the opening is a metal bellows 51 disposed on the second surface 24 of the lid body 21 and a disk shape attached to the other of the opening ends of the metal bellows 51. The bellows cap (partition plate) 52 is provided. The bellows mechanism 50 includes a seal member 53 provided on the bellows cap 52 and a guide 54 attached to the outer peripheral portion of the bellows cap 52.

  One end of the metal bellows 51 that contacts the second surface 24 is joined to the second surface 24 of the lid body 21 by welding. The junction between the metal bellows 51 and the lid body 21 has liquid (air) tightness between the oil chamber L and the gas chamber G.

  The bellows cap 52 is provided on the axial center of the bellows cap 52 and has a bottomed cylindrical recess 56 into which the seal member 53 is fitted from the oil chamber L side. The bellows cap 52 has a seal stopper 57 that is fixed to the periphery of the recess 56 by, for example, welding or the like and can prevent the seal member 53 from being detached. The seal stopper 57 only needs to be able to fix the seal member 53, and the shape thereof can be appropriately changed depending on the shape and size (thickness, diameter, etc.) of the seal member 53.

  The bellows cap 52 has a liquid (air) tightness between the oil chamber L and the gas chamber G by welding the other end of the metal bellows 51 to the surface (the surface on the oil chamber L side) facing the lid 13. Are joined.

  The sealing member 53 excludes the disk-shaped metal member 60, the main surface of the metal member 60 facing the end surface 26a of the cylindrical member 26, and the side surface of the metal member 60, that is, the surface of the metal member 60 on the gas chamber G side. A seal 61 provided on the outer surface and formed of an elastic resin material. The metal member 60 is formed so that its thickness is substantially the same as the depth of the recess 56 or thinner than the depth of the recess 56. In order to improve the durability, the corners of the metal member 60 are preferably chamfered. Further, the metal member 60 is formed with a smaller diameter than the recess 56.

  The seal 61 is formed by molding a resin material on the side surface of the metal member 60 and the outer surface facing the end surface 26a. The seal 61 is adhered to the metal member 60 with an adhesive such as a vulcanized adhesive. In addition, the resin material used for the seal | sticker 61 should just have a tolerance with respect to the hydraulic fluid used for the hydraulic circuit of a brake, for example, and should just have a sealing performance by elastically deforming. The resin material and the adhesive material can be appropriately changed depending on the use of the accumulator 1.

  The seal 61 includes a covering portion 63 that covers a part and side surfaces of the outer surface of the metal member 60, and a liquid sealing portion 64 that seals the end surface 26 a around the communication hole 33 of the cylindrical member 26. The covering portion 63 covers the main surface of the metal member 60 and the side surface of the metal member 60 facing the end surface 26a, and the thickness thereof is formed to be substantially constant. The liquid sealing portion 64 protrudes from the covering portion 63 by a predetermined thickness, and is formed in a shape having a sealing surface 65 that seals by contacting the end surface 26 a of the cylindrical member 26.

  More specifically, the liquid sealing portion 64 has a predetermined distance from the axial center of the sealing member 53, here a predetermined distance from the outer peripheral surface of the covering portion 63 from a position slightly larger than the outer diameter of the communication hole 33. It is formed in a shape protruding from the inside. Further, the sealing surface 65 of the liquid sealing portion 64 and the outer surface of the covering portion 63 are continuous with an inclined portion or a curved surface portion (hereinafter, referred to as “inclined portion 66”) having a predetermined angle. . That is, the seal 61 is formed in a shape in which an annular mountain-shaped liquid sealing portion 64 having a sealing surface 65 protrudes from the covering portion 63 and the covering portion 63 and the liquid sealing portion 64 are smoothly continuous by the inclined portion 66. ing.

  The guide 54 is formed of a sliding member that can smoothly slide the inner wall surface 17 when the bellows cap 52 moves in accordance with the expansion and contraction of the metal bellows 51. The guide 54 is merely formed so as to be able to slide smoothly on the inner wall surface 17, and the gas chamber G communicates with the space of the inner wall surface 17 and the metal bellows 51.

  In the accumulator 1 configured as described above, when the pressure in the hydraulic circuit rises and the pressure in the cavity portion 31 becomes higher than the pressure in the gas chamber G, the oil passage hole 30 in the port portion 22 and the cavity portion 31 in the cylindrical member 26. The hydraulic oil in the hydraulic circuit flows into the oil chamber L through the communication hole 33. Due to the inflow of the hydraulic oil, the pressure (hydraulic pressure) in the oil chamber L becomes the same as the pressure in the hydraulic circuit, and the accumulator 1 accumulates the pressure in the hydraulic circuit and buffers the pulsation in the hydraulic circuit. Become. At this time, the gas pressure in the gas chamber G is compressed so as to be the same as the oil pressure in the oil chamber L.

  When the oil pressure in the oil chamber L at this time exceeds the gas pressure in the gas chamber G, the metal bellows 51 expands and the gas in the gas chamber G contracts as shown in FIG. Due to the contraction of the gas in the gas chamber G, the hydraulic oil and the gas are balanced at a predetermined position.

  Next, when the pressure in the hydraulic circuit is increased, the pressure in the oil chamber L is increased, the gas is further contracted, and the metal bellows 51 is expanded. At this time, at least one of the gas pressure and the gas volume in the gas chamber G is adjusted according to the specifications of the accumulator 1 such as the working pressure and temperature in the hydraulic circuit, and the metal bellows 51 has the guide 54 in the pipe portion 15. Only the range in which the peripheral surface 15a slides is expanded and contracted. In the following description, the gas pressure is adjusted. However, the gas pressure may be adjusted instead of the gas pressure, or both the gas pressure and the gas volume may be adjusted.

  Next, when the pressure in the hydraulic circuit decreases, the pressure of the hydraulic oil in the oil chamber L also decreases, and the gas in the gas chamber G expands. As a result, the metal bellows 51 contracts. At this time, when the hydraulic pressure in the oil chamber L becomes lower than the predetermined pressure and drops below the predetermined pressure, the seal surface 65 of the seal 61 and the end surface of the cylindrical member 26 are shown in FIGS. The metal bellows 51 contracts and the bellows cap 52 moves to a position where it abuts against the 26a.

  When the seal surface 65 and the end surface 26 a come into contact with each other, the end surface 26 a around the communication hole 33 of the cylindrical member 26 is sealed by the seal member 53, and the oil chamber L is separated from the oil passage hole 30 of the port portion 22. The space to the communication hole 33 is closed (liquid sealed) through the hollow portion 31 of the cylindrical member 26 and partitioned. Due to the blockage of the oil chamber L, the hydraulic oil located between the outer peripheral surface of the cylindrical member 26 and the metal bellows 51 from the bellows cap 52 does not move from the communication hole 33 into the hydraulic circuit. For this reason, it becomes possible to restrict | deform the deformation | transformation to the center direction of the metal bellows 51 by gas pressure with gas pressure and the hydraulic pressure of hydraulic fluid.

  Thus, when the end surface 26a of the cylindrical member 26 is sealed by the seal member 53, the seal member 53 is pressed toward the end surface 26a by the gas pressure. In the seal 61 of the seal member 53, since the liquid sealing portion 64 protrudes from the covering portion 63, the liquid sealing portion 64 is further elastically deformed with respect to the covering portion 63. At this time, since the liquid sealing portion 64 is pressed in the thickness direction, a part of the liquid sealing portion 64 is elastically deformed in the radial direction, and a lateral force is applied around the boundary between the liquid sealing portion 64 and the covering portion 63. Will be added. That is, a part of the liquid sealing portion 64 is deformed as an elastic deformation into an inclined portion 66 provided at the boundary between the liquid sealing portion 64 and the covering portion 63, and bulges (projects) in the radial direction from the inclined portion 66. It will be. In addition, the broken line in FIG. 3 has shown the shape of the seal | sticker 61 before elastic deformation.

  According to the accumulator 1 configured as described above, when the liquid sealing portion 64 of the seal member 53 abuts against the end surface 26a due to gas pressure and is pressed, the seal 61 is elastically deformed so as to protrude from the inclined portion 66. . For this reason, it is possible to prevent the adhesion between the seal 61 and the metal member 60 from peeling off. As a result, it is possible to prevent deterioration in sealing performance (loss of sealing performance) due to peeling of the seal 61 of the sealing member 53, and durability and reliability are improved.

Next, the peeling of adhesion between the metal member 60 and the seal 61 of the seal member 53 will be described.
FIG. 6 is a view showing an example of a seal member 100A used in the conventional accumulator 100. As shown in FIG. In FIG. 6, the same functional parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. In FIG. 6, a broken line J indicates the elastic deformation shape of the seal 101.

  As shown in FIG. 6, for example, a conventional accumulator 100 includes a seal member 100A. The seal member 100A is configured not to have the covering portion 63 of the seal member 53 according to the present embodiment. That is, the seal 101 of the seal member 100 </ b> A has a liquid seal portion 102, and is provided continuously from the liquid seal portion 102 to the metal member 60 with the inclined portion 103. The seal 101 and the metal member 60 are bonded with a vulcanizing adhesive or the like.

  Here, in the accumulator 1, when the gas pressure in the gas chamber G becomes higher than the oil pressure in the oil chamber L, the seal 101 of the seal member 100A comes into contact with the end surface 26a of the cylindrical member 26 and is pressed in the thickness direction of the seal 101. The Rukoto. For this reason, the liquid sealing portion 102 of the seal 101 is crushed in the thickness direction and elastically deformed so that the inclined portion 103 protrudes in the radial direction as indicated by a broken line J.

  However, since the seal 101 and the metal member 60 are bonded by an adhesive, the seal 101 is elastically deformed so that only the inclined portion 103 protrudes in the radial direction as shown by a broken line J in FIG. .

  That is, in the seal 101, the adhesive surface of the seal 101 is bonded to the metal member 60 and the seal 101 is fixed to the metal member 60. For this reason, the elastic deformation of the seal 101 is elastically deformed into an arcuate projecting shape from the adhesive surface of the seal 101 to the seal surface 65 as indicated by a broken line J.

  At this time, a force to move in the radial direction is applied to the seal 101 by elastic deformation. Due to the force in the radial direction, a force for elastic deformation of the seal 101 is also applied to the bonding surface of the seal 101 and the bonded portion (adhesive) between the seal 101 and the metal member 60. As a result, stress that separates from the metal member 60 of the seal 101 is applied to the seal 101 and the metal member 60. That is, shear stress is generated on the bonding surface of the seal 101 and the boundary between the seal 101 and the metal member 60 in the bonding portion.

  As described above, since the elastic member is repeatedly pressed against the end surface 26a of the cylindrical member 26 when the pressure of the hydraulic oil in the hydraulic circuit fluctuates, the shear stress is repeatedly applied to the bonded portion between the seal 101 and the metal member 60. Applied. When this shear stress is repeatedly applied to the bonded portion, the bonded portion between the seal 101 and the metal member 60, that is, the solidified adhesive, is deteriorated in adhesive force due to a decrease in performance or fatigue due to repeated shear stress or strain. There is a risk of destruction. When such a decrease in adhesive force or fatigue failure occurs, there is a risk of peeling between the seal 101 and the metal member 60.

  Further, since the seal 101 in the vicinity of the adhesive portion (near the adhesive surface of the seal 101) is closer to the adhesive surface than the seal surface, the elastic deformation amount is small although it is slightly elastically deformed. For this reason, similarly, when shear stress is repeatedly applied, there is a possibility that the seal 101 near the adhesion portion may be broken.

  When the seal 101 and the metal member 60 are peeled off or the seal 101 is broken, the seal 101 may be displaced from the metal member 60 or the seal function may be detached. Or, the sealing function may be stopped. Due to such a decrease in sealing performance (function), the reliability of the seal member 100A is decreased. Further, when the sealing function is stopped by the seal member 100A, when the gas pressure in the gas chamber G is high, the metal bellows 51 is pressed and deformed by the gas pressure in the inner diameter direction. When the metal bellows 51 is deformed, fatigue failure of the metal bellows 51 occurs, leading to functional loss of the accumulator 1.

  On the other hand, as shown in FIG. 2, in the seal member 53 of the present invention, when the seal surface 65 and the end surface 26 a abut on the seal 61, the inclined portion 66 protrudes in the radial direction. At this time, the elastic deformation of the seal 61 is an elastic deformation protruding from the inclined portion 66 in the radial direction.

  As described above, the elastic deformation of the seal 61 protrudes from the inclined portion 66 in the radial direction, so that the seal 61 is applied with a force to move in the radial direction due to the elastic deformation. However, a greater radial force due to such elastic deformation is applied to the inclined portion between the liquid sealing portion 64 and the covering portion 63 of the seal 61.

  That is, the deformation stress applied to the bonding portion (adhesive) between the metal member 60 and the covering portion 63 of the seal 61 as described above can be reduced as much as possible. For this reason, even when the sealing member 53 is repeatedly pressed against the end surface 26a of the cylindrical member 26 due to the pressure fluctuation of the hydraulic oil in the hydraulic circuit, the separation between the seal 61 and the metal member 60 is prevented as much as possible. It becomes possible to prevent the seal 61 from being broken in the vicinity of the bonded portion.

  By preventing the peeling between the seal 61 and the metal member 60 and the breakage of the seal 61, it is possible to prevent the seal function of the seal member 53 from being deteriorated (maintaining the seal function). Further, the durability of the seal member 53 by using the accumulator 1 is improved, and the reliability of the seal member 53 is improved. Further, by improving the reliability of the seal member 53, the deformation of the metal bellows 51 in the inner diameter direction is prevented, and the reliability of the accumulator 1 is also improved.

  Further, the seal member 53 is provided with a seal 61 on the outer surface excluding the outer surface of the metal member 60 on the gas chamber G side, so that the thickness of the seal member 53 is reduced to the seal 61 for the outer surface of the metal member 60 on the gas chamber G side. It is possible to reduce the thickness by the thickness of the covering portion 63. Further, the seal member 53 is provided with the seal 61 on the outer surface of the metal member 60 excluding the outer surface on the gas chamber G side, so that the contact area between the seal 61 and the metal member 60 can be increased as much as possible. It is possible to prevent a decrease in adhesive strength as much as possible.

  As a result, the seal member 53 can be reduced in thickness, and the decrease in adhesive strength can be prevented. For this reason, the bellows cap 52 can be reduced without reducing the adhesive strength between the seal 61 of the seal member 53 and the metal member 60, and the volume of the oil chamber L and the gas chamber G in the accumulator 1 can be increased, or The accumulator 1 can be downsized.

  In addition, the downsizing of the accumulator 1 reduces the material necessary for manufacturing the accumulator 1, and can reduce the manufacturing cost. Thereby, the accumulator 1 can be manufactured at low cost.

  As described above, according to the accumulator 1 according to the present embodiment, the seal 61 in which the liquid sealing portion 64 and the covering portion 63 are smoothly and continuously connected to the metal member 60 by the inclined portion 66 is used as the sealing member 53. Thus, it is possible to prevent (maintain) a decrease in the sealing function of the sealing member 53. That is, the durability of the seal member 53 is improved, and the reliability of the seal member 53 can be improved. Further, by making it possible to maintain the sealing function of the sealing member 53 (improvement of durability), it is possible to prevent deterioration of the function of the accumulator 1 and improve reliability.

  Furthermore, by providing the seal 61 on the outer surface of the metal member 60 other than the outer surface on the gas chamber G side, the thickness of the seal member 53 can be reduced and the accumulator 1 can be downsized.

  Next, a first modification of the accumulator 1 according to the present embodiment will be described. FIG. 4 is a partial cross-sectional view showing the configuration of the seal member 53A used in the accumulator 1A according to the first modification of the present invention. 4, the same functional parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, the accumulator 1 </ b> A has a seal member 53 </ b> A that is fitted inside the recess 56 of the bellows cap 52. The seal member 53A is fixed by a seal stopper 57 so as to prevent the seal member 53A from dropping from the recess 56.

  The seal member 53A includes a disk-shaped metal member 60 and a seal 61A provided on an outer surface facing the end surface 26a of the cylindrical member 26 of the metal member 60 and formed of an elastic resin material. . The metal member 60 is formed to have a slightly smaller diameter than the inner diameter of the recess 56 so that the metal member 60 can be fitted into the recess 56.

  The seal 61 </ b> A is formed by molding a resin material with an outer diameter slightly smaller than the outer diameter of the metal member 60. The seal 61A is bonded to the outer surface of the metal member 60 with an adhesive such as a vulcanized adhesive. The seal 61 </ b> A includes a covering portion 63 </ b> A that covers the outer surface of the metal member 60 and a liquid sealing portion 64 that seals the end surface 26 a around the communication hole 33. The covering portion 63A covers a part of the outer surface facing the end surface 26a of the cylindrical member 26 of the metal member 60, and is formed to have a substantially constant thickness. The liquid sealing part 64 is formed in a shape having a sealing surface 65 that protrudes from the covering part 63A by a predetermined thickness and that seals by contacting the end surface 26a.

  The liquid sealing part 64 has the same configuration as the liquid sealing part 64 of the sealing member 53, and the sealing surface 65 of the liquid sealing part 64 and the outer surface of the covering part 63A are inclined parts 66 that are inclined parts or curved parts. Is continuous. That is, the seal 61A is provided with a covering portion 63A having a predetermined thickness on a part of the outer surface of the metal member 60, and an annular mountain-shaped liquid sealing portion 64 having a sealing surface 65 protrudes from the covering portion 63A. The covering portion 63A and the liquid sealing portion 64 are integrally formed in a smoothly continuous shape.

  According to the accumulator 1A configured as described above, when the liquid sealing portion 64 of the seal member 53A comes into contact with the end surface 26a due to gas pressure and is pressed, like the seal member 53 of the accumulator 1, the inclined portion 66 is Elastically deforms. For this reason, it becomes possible to prevent the adhesion between the seal 61A and the metal member 60 from peeling off. Thereby, it becomes possible to prevent the loss of the sealing performance due to the peeling of the seal 61A of the sealing member 53A, and the reliability is improved. Further, by improving the reliability of the seal member 53A, the deformation of the metal bellows 51 in the inner diameter direction is prevented, and the reliability of the accumulator 1A is improved.

  Furthermore, the seal member 53A is provided with a seal 61A only on a part of the outer surface of the metal member 60 facing the end surface 26a of the cylindrical member 26, so that the thickness and diameter of the seal member 53A can be reduced. It is possible to reduce the thickness. For this reason, the bellows cap 52 can also be made small, and the volume of the oil chamber L and the gas chamber G in the accumulator 1A can be increased, or the accumulator 1A can be downsized.

  As described above, according to the accumulator 1A according to the present embodiment, a seal in which the liquid sealing portion 64 and the covering portion 63A are smoothly and continuously connected to a part of the outer surface of the metal member 60 of the sealing member 53A by the inclined portion 66. By providing 61A, it becomes possible to prevent the sealing function of the sealing member 53A from being lowered. This improves the durability and reliability of the seal member 53A, and also improves the reliability of the accumulator 1A. Further, the accumulator 1A can be downsized.

  Next, a second modification of accumulators 1 and 1A according to the present embodiment will be described. FIG. 5 is a partial cross-sectional view showing a configuration of a seal member 53B used in an accumulator 1B according to a second modification of the present invention. 5, the same functional parts as those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, the accumulator 1 </ b> B has a seal member 53 </ b> B fitted inside the recess 56 of the bellows cap 52, and this seal member 53 </ b> B is fixed by a seal stopper 57 so as to prevent dropping. Yes.

  The seal member 53B includes a metal member 60 and a seal 61B provided on the outer surface of the metal member 60 and formed of a resin material having elasticity.

  The seal 61B is formed by being molded on the outer surface of the metal member 60 with a resin material. The seal 61B is bonded to the metal member 60 on the outer surface of the metal member 60 with an adhesive such as a vulcanized adhesive. The seal 61 </ b> B includes a covering portion 63 </ b> B that covers the outer surface of the metal member 60 and a liquid sealing portion 64 that seals the end surface 26 a around the communication hole 33. The covering portion 63 </ b> B covers the outer surface of the metal member 60 and has a substantially constant thickness. The liquid sealing part 64 is formed so as to protrude from the covering part 63B by a predetermined thickness.

  The liquid sealing part 64 is formed in the same manner as the liquid sealing part 64 of the sealing members 53 and 53A, and the sealing surface 65 of the liquid sealing part 64 and the outer surface of the covering part 63B have an inclined part 66. Are continuous.

  According to the accumulator 1B configured as described above, when the liquid sealing portion 64 of the seal member 53B comes into contact with the end surface 26a due to gas pressure and is pressed, like the seal members 53 and 53A of the accumulator 1, 1A, The inclined portion 66 is elastically deformed. For this reason, it becomes possible to prevent the adhesion between the seal 61B and the metal member 60 from peeling off. As a result, it is possible to prevent deterioration of the sealing performance due to the peeling of the seal 61B of the seal member 53B, and durability and reliability are improved. Further, by improving the reliability of the seal member 53B, the deformation of the metal bellows 51 in the inner diameter direction is prevented, and the reliability of the accumulator 1B is improved.

  Further, since the metal member 60 is entirely covered with the seal 61B, the seal 61B can surely prevent the metal member 60 from being detached from the metal member 60 even if the adhesive is peeled off. This makes it possible to increase the contact area between the seal 61B and the metal member 60 as much as possible, and to prevent a decrease in adhesive strength due to the adhesive as much as possible. Since the metal member 60 is entirely covered with the seal 61B and is molded around the metal member 60, the metal member 60 can be applied without using an adhesive.

  The present invention is not limited to the above embodiment. For example, in the above-described example, the accumulators 1 to 1B are used for the brake hydraulic circuit of the vehicle body, but can be applied to other hydraulic circuits. Further, not only the hydraulic circuit but also other pressure circuits can be used. Moreover, although the inclination part 66 mentioned above was made into the inclination or curved surface which has a predetermined angle, a curved surface and a continuous inclination may be sufficient. In addition, various modifications can be made without departing from the scope of the present invention.

Sectional drawing which shows the structure of the accumulator which concerns on one embodiment of this invention. Sectional drawing which shows the movement of the bellows mechanism of the accumulator. The expanded sectional view which shows the principal part of the bellows mechanism. The partial cross section figure which shows the structure of the seal member used for the accumulator which concerns on the 1st modification of this invention. The partial cross section figure which shows the structure of the seal member used for the accumulator which concerns on the 1st modification of this invention. The partial cross section figure which shows an example of a structure of the sealing member used for the conventional accumulator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1-1B ... Accumulator, 10 ... Pressure vessel, 11 ... Steel pipe, 12 ... Opening part, 12a ... Curved surface part, 13 ... Cover body, 15 ... Pipe part, 15a ... Inner peripheral surface, 16 ... End part (bottom part), 16a ... inner surface, 17 ... inner wall surface, 18 ... through hole, 19 ... gas sealing plug, 20 ... cover, 21 ... cover body, 22 ... port portion, 23 ... first surface, 24 ... second surface, 26 ... cylindrical member 26a ... end face, 27 ... side face part, 28 ... blocking seal, 29 ... seal groove, 30 ... oil passage hole, 31 ... hollow part, 32 ... end face part, 33 ... communication hole (inflow hole), 50 ... bellows mechanism, 51 ... Metal bellows, 52 ... Bellows cap (partition plate), 53-53B ... Seal member, 54 ... Guide, 56 ... Recess, 57 ... Seal stopper, 60 ... Metal member, 61-61B ... Seal, 63-63B ... Cover 64, liquid sealing part, 65 ... sealing surface, 66 ... Slope portions, G ... gas chamber, S ... weld, L ... oil chamber.

Claims (4)

A bottomed cylindrical outer shell member, and a pressure vessel including a lid body that closes an opening of the outer shell member and has an inflow hole through which liquid can flow into and out of the outer shell member;
A metal bellows formed to be stretchable along the inner wall surface of the pressure vessel, and a partition plate that is provided on the metal bellows and moves following the metal bellows along the inner wall surface of the pressure vessel. A bellows mechanism that partitions the inside of the pressure vessel into a liquid chamber capable of flowing in and out of the liquid and an air chamber capable of enclosing gas by a bellows and a partition plate;
A disk-shaped metal member provided on the liquid chamber side of the partition plate, a covering portion covering the surface of the metal member, and protruding from the covering portion, and at least one of the covering portion, the inclined portion, and the curved surface portion And a sealing member having a liquid sealing portion formed so that the liquid chamber can be liquid-sealed with the inflow hole.   The accumulator according to claim 1, wherein the covering portion covers at least a part of a surface of the metal member that faces the liquid surface.   The accumulator according to claim 1, wherein the covering portion covers a surface of the metal member facing the liquid chamber and a side surface of the metal member.   The accumulator according to claim 1, wherein the covering portion covers the entire outer surface of the metal member.

Images