CN1824968A - Single cylinder hydraulic shock absorber - Google Patents
Single cylinder hydraulic shock absorber Download PDFInfo
- Publication number
- CN1824968A CN1824968A CN 200610051430 CN200610051430A CN1824968A CN 1824968 A CN1824968 A CN 1824968A CN 200610051430 CN200610051430 CN 200610051430 CN 200610051430 A CN200610051430 A CN 200610051430A CN 1824968 A CN1824968 A CN 1824968A
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- air
- lip
- cylinder body
- core bar
- shock absorber
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- Sealing With Elastic Sealing Lips (AREA)
Abstract
A single-cylinder hydraulic shock absorber ( 1 ) is provided with an air chamber ( 2 ) which is formed by a flexible tubular member ( 2 a) connected air-tightly to each of an upper part of a cylinder ( 11 ) and a piston rod ( 12 ) to enclose air therein. The air chamber ( 2 a) includes at the lower end a tubular protector ( 23 ) engaged to an upper part of the cylinder ( 11 ). A flexion part ( 23 a) in an upper end of the protector ( 23 ) is retained on an upper end surface of the cylinder ( 11 ). A seal member ( 3 ) located between the flexion part ( 23 a) and the upper end surface includes a cored bar (33) fixed on the upper end surface of the cylinder ( 11 ) and having a dust lip ( 31 ) and an oil lip ( 32 ), and a circular air seal ( 5 ) interposed between the cored bar and the flexion part.
Description
Invention field
The present invention relates to be used for the improvement of the single cylinder hydraulic shock absorber with pneumatic spring of suspension device for vehicle.
Background of invention
Disclose a kind of single cylinder hydraulic shock absorber that is used for suspension device for vehicle in the unexamined patent disclosure JP2004-332747A of Japan, this single cylinder vibration damper has an air chamber at an upper portion thereof.
In this example, air chamber is provided with a calendering barrier film (rolling diaphragm), one of this calendering barrier film distolaterally is airtight feud with a piston rod and is connected, and another is distolateral to be airtight feud with a cylinder body side and to be connected, thereby keeps being the hermetic seal state in the air chamber.
Summary of the invention
Under the situation that cylinder body is made by aluminium, the weight of dydraulic shock absorber is reduced greatly.Yet when the calendering barrier film was connected with the airtight feud of aluminium rotor housing by welding, the intensity of aluminium just had been lowered, and this is very disadvantageous.
Because therefore above-mentioned situation, needs a kind of single cylinder hydraulic shock absorber that can overcome above-mentioned defective in this association area.By of the present invention open, those skilled in the art can know significantly, the invention solves the problem that needs of this needs in this association area and other.
The dydraulic shock absorber that the object of the present invention is to provide a kind of gas tightness that can keep air chamber that the intensity of cylinder body is reduced.
To achieve these goals, in one aspect of the invention, provide a kind of single cylinder hydraulic shock absorber.This vibration damper has: a cylinder body; One piston rod, this piston rod can shift out slidably from cylinder body top, and enters the outside; One flexible tubular element is used to form an air chamber, and it is airtight feud respectively with cylinder body top and piston rod and is connected, thereby air tank is trapped among its inside.Flexible tubular element has a lower end, and this lower end is provided with the tube guard with the cylinder body upper bond.The inner periphery of this protector upper end has an aduncate curved section, and this curved section is maintained on the cylinder body upper-end surface.One seal element is inserted between curved section and the cylinder body upper-end surface; the sealing element comprises a dirt lip and the grease proofing lip on the piston outer periphery that is bonded on the inner peripheral surface side; in addition; one core bar is fixed on the cylinder body upper-end surface by ca(u)lk; one circular air seals is inserted between the curved section of core bar and protector; thereby this air seals prevents that the air in the air chamber from leaking from the joint clearance between protector and the cylinder body.
Therefore; according to this aspect of the invention; because the air seals that is inserted between cylinder body upper-end surface and the protector curved section has stoped the air in the air chamber to leak; therefore, between them, need not welding joint part and just can keep tightness in the mating face between cylinder body and the protector well.
Therefore, make by aluminium so that when making vibration damper in light weight, can prevent from reliably to reduce because of welding causes cylinder strength when cylinder body.
To describe preferred embodiments more of the present invention below in detail, and describe and in conjunction with the accompanying drawings by these, those skilled in the art just can be expressly understood these and other purpose, feature, aspect and advantage of the present invention.
Description of drawings
With reference to accompanying drawing, these accompanying drawings constitute the original disclosed part of the present invention.
Fig. 1 is the front sectional elevation of the part of the single cylinder hydraulic shock absorber in the first preferred embodiment of the invention;
Fig. 2 is the part section front elevation of the key component of the amplification of one among Fig. 1;
Fig. 3 is the part section front elevation of the key component of the amplification of one in the second preferred embodiment of the invention;
Fig. 4 is the part section front elevation of the key component of the amplification of one in the third preferred embodiment of the invention;
Fig. 5 is the part section front elevation of the key component of the amplification of one in the four preferred embodiment of the invention.
Detailed description of preferred embodiment
The preferred embodiments of the present invention are described below with reference to accompanying drawings.
First preferred embodiment of the present invention shown in Fig. 1 and Fig. 2 will be described below.
As shown in Figure 1, the single cylinder hydraulic shock absorber 1 in the first preferred embodiment of the invention is provided with a cylinder body 11 and an air chamber 2, and wherein cylinder body 11 is made by aluminium, and air chamber 2 is as a pneumatic spring, and is set in the upper end side of cylinder body 11.But, only expressed the part of air chamber 2 among the figure.
As shown in Figure 2, by the ca(u)lk operation, the whole periphery as the upper end of cylinder body 11 opening ends is curved inwardly.By an aduncate ca(u)lk end 11a, an oil seal is fixed on the upper-end surface of cylinder body 11, the upper end open of cylinder body 11 is closed by this oil seal 3.
One piston rod 12 passes the central authorities of oil seal 3.Oil seal 3 is attached to piston rod 12 surfaces to those and oils to scrape and sweep, thus stop oil from cylinder body 11 internal leakages to the outside.
As shown in Figure 1, air chamber 2 is made of a flexible tubular element 2a, and this flexible tubular element comprises: tubulose calendering barrier film 21, and it is made by the flexible material such as rubber; One piston tube 22, it is made by metal tube or similarity piece, and is connected the inboard of prolonging barrier film 21 lower ends; One protector 23, it is that metal tube or similarity piece are made by identical materials, and is connected the inboard of piston tube 22.
The upper end portion of retainer 23 is connected with cylinder body 11 airtight feuds, and this will be described in the back.The upper end (not shown) of calendering barrier film 21 is connected with the airtight feud, outer periphery of piston rod 12 upper ends, thereby forms the space of a sealing, so that gas is enclosed in the calendering barrier film 21.The effect of pneumatic spring is just played in the compression of this gas enclosed space or expansion, thereby along expansion direction elastic force is applied on the piston rod 12.
More particularly, calendering barrier film 21 is manufactured into tubulose, and have than piston tube 22 much bigger diameter, perhaps be manufactured into other shape, and this calendered film is provided with so-called loose part, and this loose part is manufactured into and can reels in the underpart.Engage with the outer periphery of piston tube 22 upper end portions in inboard retrousse another ends of calendering barrier film 21, and be airtight feud and be clamped on it, for example, utilize a clamp ring 21a to clamp.
Calendering barrier film 21 limits an air space A who is closed in so-called rubber membrane inboard, and as a pneumatic spring, it can be by the air that sealed among the air space A or the pressure of other gas between this space empty, impels piston rod 12 to move towards expansion direction.
In many cases, piston tube 22 all is made into the tubular form that shrink the bottom.The upper end portion of piston tube 22 is connected to the underpart of rolling barrier film 21 by airtight feud, and the underpart of the reduced part of piston tube 22 joins on the outer periphery of retainer 23 underparts, and also is the connection of airtight feud.
The diameter of protector 23 is less than the diameter of piston tube 22, and still, this protector 23 is made into tubulose, and its diameter is a bit larger tham the diameter of cylinder body 11, thereby this protector is lived the top of cylinder body 11 from cylinder body 11 outer side covers.The upper end of protector 23 constitutes an aduncate curved section 23a, and joins on the upper-end surface of cylinder body 11 by this curved section 23a.
Should be noted that protector 23 can be made by aluminium.In this case; welding joint is not passed through in the underpart of the underpart of piston tube 22 and protector 23; but for example be maintained at a kind of like this state; promptly; sealing material is between them; the outer periphery of protector 23 lower ends is press fitted in the underpart of piston tube 22, thereby forms a predetermined hermetic seal structure between them.
Make by aluminium at protector 23, under the situation that cylinder body is made by aluminium, help to reduce to have the weight of the air chamber 2 of protector 23, thereby make that the overall weight of single cylinder hydraulic shock absorber with pneumatic spring can further be reduced.
Curve inwardly by the upper end portion that makes protector 23, thereby curved section 23a is manufactured a bead shape.This method partly is that curved section 23a is made, compared by the method that is connected on the protector 23 by welding then by different parts with bead, easier manufacture component, and it is easier of the advantage that guarantees to have mechanical strength.
The reason that curved section 23a is manufactured the bead shape is, is easier to like this realize that blocks air passes through between a curved section 23a and a sub-Sealing 5, and for sub-Sealing 5 wherein, the back will be described.
In addition, as shown in Figure 2, oil seal integrally comprises a dirt lip 31 and a grease proofing lip 32 for 3 one-tenth, each all has an inner surface, the outer periphery sliding contact of surface, this inside and piston rod 12, and be set at the inner periphery side of the core bar 33 of a circle, in addition, one outer periphery lip 34 is become integrally to remain on the periphery avris of core bar 33, becomes the fluid-tight state so that keep with the inner periphery of cylinder body 11.One outer periphery of core bar 33 partly is placed between the ca(u)lk end 11a and supporting member 4 of cylinder body 11, and is fixed within it by ca(u)lk.
Because oil seal 3 is made in a manner described, therefore, when piston rod 12 enters cylinder body 11, by dirt lip 31 those are scraped attached to the dust on piston rod 12 outer peripherys and to sweep, and when cylinder body 11 shifted out, those were scraped by grease proofing lip 32 attached to the oil on piston rod 12 outer peripherys at piston rod 12.
Because outer periphery lip 34 has above-mentioned liquid seal characteristic, therefore, in oil seal 3, can prevent to leak in the cylinder body 11 by outer periphery lip 34 at the air of holding back between end 11a and the core bar 33 of cylinder body 11.
As shown in Figure 2; sub-Sealing 5 is manufactured into circle; and be set between the curved section 23a of the core bar 33 of oil seal 3 and protector 23, thereby stop air leaking between the 11a of the ca(u)lk end of curved section 23a and cylinder body 11 and between the ca(u)lk end 11a of the core bar 33 of oil seal 3 and cylinder body 11.
Yet, as for air passing through between the ca(u)lk end 11a of the core bar 33 of oil seal 3 and cylinder body 11, because the outer periphery lip 34 of oil seal 3 finally can stop air leakage in cylinder body 11, therefore, there is no need to stop utterly air between the ca(u)lk end 11a of the core bar 33 of oil seal 3 and cylinder body 11, to pass through.
Can conclude from this,, can select any structure, as long as can guarantee to stop air between the ca(u)lk end 11a of the curved section 23a of protector 23 and cylinder body 11, to take place to leak about above-mentioned sub-Sealing 5.
Therefore; sub-Sealing 5 shown in Figure 2 comprises a circular metal spare 51 and a circular air seals 52; said circular metal spare 51 is maintained between the curved section 23a of the core bar 33 of oil seal 3 and protector 23, said circular air seals 52 adjacent metal parts 51 inner peripherys.Air seals 52 is retained with the inner periphery of metalwork 51 in aggregates.The thickness that should be noted that metalwork 51 is manufactured into identical with the thickness of core bar 33.
Aspect this, air seals 52 be designed to can protected device 23 curved section 23a extruding and distortion, therefore, force this air seals 52 closely to contact with the core bar 33 of curved section 23a and oil seal 3.So, air seals 52 stops air leaking between curved section 23a and the air seals 52 and between core bar 33 and air seals 52, just, stop air to flow into outside by the gap between curved section 23a and the ca(u)lk end 11a from the air space A in the air chamber 2.
Yet, be extruded and be out of shape before air seals 52 be constructed such that its two lip end 52a extend up and down, shown in the dotted line among the figure.
Can know that from top description sub-Sealing 5 can adopt Any shape, a straw cord for bundling up rice or wheat stalks Sealing 5 can be carried out intended function and get final product.For example, in second preferred embodiment shown in Figure 3, sub-Sealing 5 is made by O shape ring 53.
At sub-Sealing 5 is under the situation of O shape ring 53, and O shape ring 53 is received among the circular slot part 23c, and this circle slot part is fabricated among the curved section 23a of protector 23 towards the below.
Even in by the O shape ring 53 sub-Sealings of making 5, when group Sealing 5 was maintained among the circular slot part 23c between the curved section 23a of the core bar 33 of oil seal 3 and protector 23, this sub-Sealing 5 was extruded and is out of shape.
Fig. 4 has expressed the 3rd preferred embodiment, and wherein, sub-Sealing 5 forms an integral body with oil seal 3.
Oil seal integrally comprises for 3 one-tenth: a dirt lip 31 and a grease proofing lip 32, each lip all has an internal surface with the outer periphery sliding contact of piston rod 12, and be set at the inner periphery side of the core bar 33 of a circle, in addition, anti-air lip 54 is set at the outside of dirt lip 31 and around this dirt lip 31, and is held in an integral body with core bar 33.Oil seal 3 comprises an outer periphery lip 34, and this outer periphery lip 34 is become integrally to remain on the periphery avris of core bar 33, so that keeping a kind of liquid seal state with the inner periphery of cylinder body 11.
The curved section 23a extruding and the distortion of anti-air lip 54 protected devices 23, thus force this anti-air lip 54 closely to contact with the core bar 33 of curved section 23a and oil seal 3.So anti-air lip 54 has just stoped air to leak between curved section 23a and anti-air lip 54.
Yet before curved section 23a extruding should be prevented air lip 54 and make its distortion, a so-called lip end 54a was upwards standing, as shown in phantom in FIG..
In addition, expressed the 4th preferred embodiment among Fig. 5.Core bar in the oil seal 3 is divided into two-layer, and this is two-layer is made up of a upper strata and a lower floor, i.e. a top core bar 36 and a bottom core bar 33, and anti-air lip 54 is maintained in the top core bar 36.
Especially, anti-air lip 54 is being arranged under the situation of different shape, core bar 36 and core bar 33 with the anti-air lip 54 that is formed by different structure can be combined, and that is to say, can realize any combination of parts.
From top description as can be known, core bar is being divided under the two-layer situation of forming by the upper and lower, have only anti-air lip 54 to be set at top core bar 36 (not shown), the upper end portion of cylinder body 11 is processed by the ca(u)lk operation, thereby make that the core bar 36 that only has anti-air lip 54 is superimposed on existing core bar 33, so, can prevent that air from leaking.
Under the core bar 36 superimposed situations on existing core bar 33 that only have anti-air lip 54, should be noted that the shape of core bar 36, so that the side of core bar 36 inner peripherys can not disturb the dirt lip 31 that is maintained in the core bar 33.
As mentioned above, in single cylinder hydraulic shock absorber 1 according to the present invention, protector 23 is not to be connected by welding on the cylinder body 11.Therefore, even protector 23 and cylinder body 11 boths are made by aluminium, its intensity can not be lowered yet, thereby can reduce its weight.In addition, because this dydraulic shock absorber made by single cylinder body, therefore, when on the suspension arrangement that applies it to vehicle, it is littler that suspension arrangement can be made.
With enclose inside the multi-cylinder vibration damper of atmospheric pressure compare, the air that this vibration damper is sealed in according to air chamber 2 when damping effect that piston rod 12 stretches out/produced when withdrawing with respect to cylinder body 11 or the high pressure of gas improve.In this case, when stretching out of piston rod 12 operated, in air chamber 2, change by the variation of the volume of the air space A that limited of calendering barrier film 21 according to the rod volume of piston rod 12, in this respect, because corresponding to the variation of volume, calendering barrier film 21 expands/shrinks, thereby realizes predetermined pneumatic spring effect.
Because sub-Sealing 5 in the vibration damper 1 or air seals 54 have stoped the anastomosis part of air between protector 23 and cylinder body 11 to be leaked from the air chamber as pneumatic spring; therefore; can make for good and all to keep aeroseal in the air chamber 2, so just can keep the effect of good pneumatic spring always.
The application requires to enjoy the preference of Japanese publication No.2005-050578 and 2005-050579.At this full text of quoting Japanese publication No.2005-050578 and 2005-050579 as a reference.
Although only selected some preferred embodiments to describe the present invention,, from disclosing of being done here, art technology can know clearly, can make various modification and variation, this does not all depart from the scope of the present invention, and scope of the present invention is limited to the appended claims.In addition, the front description of the preferred embodiment of the present invention is indicative, and the present invention is not limited to these and describes, and the present invention is limited by appended claim and their equivalent.
Claims (10)
1, a kind of single cylinder hydraulic shock absorber comprises:
One cylinder body;
One piston rod is moved out to the outside from cylinder body top slidably;
One flexible tubular element is used to form an air chamber, and is aeroseal ground with the top of cylinder body with piston rod respectively and is connected, thus air seal in air chamber, wherein:
Flexible tubular element has a underpart, and this underpart is provided with a tube guard, and this tube guard engages with cylinder body top;
The inner periphery of protector upper end has a crooked to the inside flexible portion;
This flexible portion is by on the cylinder body upper-end surface;
One seal element is inserted between flexible member and the cylinder body upper-end surface;
The sealing element has a dirt lip and the grease proofing lip on the piston rod outer periphery of the inner periphery side of being bonded on; and a core bar is fixed on the upper-end surface of cylinder body by ca(u)lk; one circular air seals is inserted between the curved section of core bar and protector, thereby makes air seals prevent that the air in the air chamber from leaking from the joint clearance between protector and the cylinder body.
2, single cylinder hydraulic shock absorber according to claim 1, wherein:
The outer periphery part of the core bar in the seal element is fixed to by the ca(u)lk end on the upper-end surface of cylinder body, and said ca(u)lk end is by forming on the cylinder body of curved internal periphery side.
3, single cylinder hydraulic shock absorber according to claim 2, wherein:
Air seals comprises the Sealing of a circle, and this circular Sealing is set in the inner periphery of a circular metal, and this circular metal is maintained between the curved section of core bar and protector.
4, single cylinder hydraulic shock absorber according to claim 2, wherein:
Air seals comprises O shape ring, and this O shape ring is maintained between the curved section of core bar and protector.
5, single cylinder hydraulic shock absorber according to claim 2, wherein:
Air seals comprises an anti-air lip, and this anti-air lip is maintained in the core bar.
6, single cylinder hydraulic shock absorber according to claim 5, wherein:
Anti-air lip and dirt lip form an integral body, and are maintained in the core bar.
7, single cylinder hydraulic shock absorber according to claim 5, wherein:
Core bar is divided into two-layer, that is, and and a upper strata and a lower floor;
Anti-air lip is maintained on the upper surface of the core bar in the upper strata.
8, single cylinder hydraulic shock absorber according to claim 7, wherein:
Dirt lip and grease proofing lip are maintained at the core bar inner periphery side in the lower floor.
9, single cylinder hydraulic shock absorber according to claim 2, wherein:
Seal element comprises an outer periphery lip, and this outer periphery lip is set at core bar periphery avris, so that keep a kind of liquid seal state with the cylinder body inner periphery.
10, single cylinder hydraulic shock absorber according to claim 1, wherein:
Flexible tubular element comprises a calendering barrier film, and this calendering barrier film is made by the tubular rubber film;
The upper periphery end of calendering barrier film is connected on the outer periphery of piston rod with air tight manner;
One end of tubular piston pipe is connected on the end, following peripheral of calendering barrier film with air tight manner;
The other end of piston tube is connected on the end of protector with air tight manner.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005050578 | 2005-02-25 | ||
| JP2005050579 | 2005-02-25 | ||
| JP2005050578A JP2006234083A (en) | 2005-02-25 | 2005-02-25 | Single cylinder-shaped hydraulic damper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1824968A true CN1824968A (en) | 2006-08-30 |
| CN100398866C CN100398866C (en) | 2008-07-02 |
Family
ID=36935767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100514301A Expired - Fee Related CN100398866C (en) | 2005-02-25 | 2006-02-24 | Single cylinder hydraulic shock absorber |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2006234083A (en) |
| CN (1) | CN100398866C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8302526B2 (en) | 2006-09-04 | 2012-11-06 | Smc Kabushiki Kaisha | Sealing structure for fluid pressure device |
| CN106233026A (en) * | 2014-05-19 | 2016-12-14 | Ｋｙｂ株式会社 | Buffer |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2118080C3 (en) * | 1971-04-14 | 1974-05-30 | Fichtel & Sachs Ag, 8720 Schweinfurt | Suspension strut with non-return valve |
| JPH0456613A (en) * | 1990-06-27 | 1992-02-24 | Atsugi Unisia Corp | Assembly method for air suspension |
| CN2413086Y (en) * | 1999-04-23 | 2001-01-03 | 淅川汽车配件厂 | Vibration-damper with new seal |
| US6443436B1 (en) * | 2001-05-29 | 2002-09-03 | Tenneco Automotive Inc. | Air spring assembly on shock absorber with combined seal |
| JP2004116549A (en) * | 2002-09-24 | 2004-04-15 | Kayaba Ind Co Ltd | Sliding member of hydraulic equipment |
| JP4181917B2 (en) * | 2003-04-30 | 2008-11-19 | トヨタ自動車株式会社 | Single cylinder hydraulic shock absorber with air spring |
-
2005
- 2005-02-25 JP JP2005050578A patent/JP2006234083A/en active Pending
-
2006
- 2006-02-24 CN CNB2006100514301A patent/CN100398866C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8302526B2 (en) | 2006-09-04 | 2012-11-06 | Smc Kabushiki Kaisha | Sealing structure for fluid pressure device |
| CN101506533B (en) * | 2006-09-04 | 2015-11-25 | Smc株式会社 | For the sealing configuration of fluid pressure device |
| CN106233026A (en) * | 2014-05-19 | 2016-12-14 | Ｋｙｂ株式会社 | Buffer |
| US10626948B2 (en) | 2014-05-19 | 2020-04-21 | Kyb Corporation | Damper |
| CN106233026B (en) * | 2014-05-19 | 2020-05-05 | Ｋｙｂ株式会社 | Buffer device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006234083A (en) | 2006-09-07 |
| CN100398866C (en) | 2008-07-02 |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
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Granted publication date: 20080702 Termination date: 20110224 |