GB2297819A - Vehicle hydraulic damper with tube and stabiliser bar connector both of aluminium or aluminium alloy - Google Patents
Vehicle hydraulic damper with tube and stabiliser bar connector both of aluminium or aluminium alloy Download PDFInfo
- Publication number
- GB2297819A GB2297819A GB9502736A GB9502736A GB2297819A GB 2297819 A GB2297819 A GB 2297819A GB 9502736 A GB9502736 A GB 9502736A GB 9502736 A GB9502736 A GB 9502736A GB 2297819 A GB2297819 A GB 2297819A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- bar connector
- stabiliser bar
- aluminium
- hydraulic damper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G13/00—Resilient suspensions characterised by arrangement, location or type of vibration dampers
- B60G13/001—Arrangements for attachment of dampers
- B60G13/005—Arrangements for attachment of dampers characterised by the mounting on the axle or suspension arm of the damper unit
- B60G13/006—Arrangements for attachment of dampers characterised by the mounting on the axle or suspension arm of the damper unit on the stub axle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
- B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
- B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
- B60G15/067—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper characterised by the mounting on the vehicle body or chassis of the spring and damper unit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
- B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
- B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
- B60G15/07—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper the damper being connected to the stub axle and the spring being arranged around the damper
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/54—Arrangements for attachment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/10—Mounting of suspension elements
- B60G2204/12—Mounting of springs or dampers
- B60G2204/122—Mounting of torsion springs
- B60G2204/1224—End mounts of stabiliser on wheel suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/10—Mounting of suspension elements
- B60G2204/12—Mounting of springs or dampers
- B60G2204/129—Damper mount on wheel suspension or knuckle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
- B60G2204/43—Fittings, brackets or knuckles
- B60G2204/4304—Bracket for lower cylinder mount of McPherson strut
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
- B60G2204/43—Fittings, brackets or knuckles
- B60G2204/4305—Bracket for mounting of hydraulic lines on a damper cylinder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
- B60G2204/43—Fittings, brackets or knuckles
- B60G2204/4307—Bracket or knuckle for torsional springs
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Vehicle Body Suspensions (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The hydraulic damper (10) comprises a longitudinally extending tube (12) formed from extruded aluminium or aluminium alloy and a stabiliser bar connector (80) which is separately formed from aluminium or aluminium alloy. The connector (80) may be secured on the tube (12) by deforming the tube (12) in the region of the connector (80). Time-consuming welding is thus avoided and the use of aluminium gives weight advantages.
Description
HYDRAULIC DAMPER
This invention relates to a hydraulic damper for a motor vehicle, and to a method of forming such a hydraulic damper. By hydraulic damper is meant a eusspenslon etrut or shock absorber.
A hydraulic damper for use in the suspension system of a motor vehicle typically comprise. a tube; a piston sealably slldably mounted in the tube and attached to a piston rod, the piston separating a compression chamber frcm a rebound chamber within the tube; a compression stroke valve mounted on the piston which allow fluid flow from the comprog610n chamber to the rebound chamber; and a rebound stroke valve mounted on the piston which allows fluid flow from the rebound chamber to the compression chamber. The piston rod extends out of the tube at one end thereof, and is sealably sldably mounted in that one end.
Such hydraulic dampers either comprise an inner tube and an outer tube (fiOmetimes referred to as a twin tube damper) in which the piston sealably slides in the inner tube, or comprise a single tube (sometime.
referred to as a monotube damper).
It is usual practice to form the cr each tube of a hydraulic damper by rolling a sheet of steel and welding together the adjacent longitudinal edges.
External parts, such as the spring seat and the mounting bracket or steering knuckle, which are also formed from steel, are then welded to the single tube or the outer tube. The other end of the tube is sealed closed by welding on an end plate or by arc-heating and rolling the tube end, and the internal components of the suspension strut (such a. those mentioned above) are inserted into the tube by way of the one end thereof, which is then sealed closed. The use of several welding steps has disadvantages in that welds are time consuming operations. Further, welds are susceptible to corrosion. Still further, the use of steel has disadvantages with regard to weight.
It is an object of the present invention to overcome one or more of the above mentioned disadvantages.
To this end, a hydraulic damper in accordance with the present invention comprises a longitudinally extending tube and a separately formed stabiliser bar connector secured on the tube, wherein the tube is formed from extruded aluminium or aluminium alloy, and the stabiliser bar connector is formed from aluminium or aluminium alloy.
A method of forming a hydraulic damper in accordance with the present invention comprises extruding a tube of aluminium or aluminium alloy; forming a stabiliser bar connector of aluminium or aluminium alloy; and securing the stabiliser bar connector on the extruded tube.
The present invention is a modification of the invention described in our patent application no.
9420637.2, filed 13 October 1994, incorporated herein by reference.
This invention removes the steps of welding, thereby removing time consuming operations. Further the use of aluminium or aluminium alloy has advantages with regard to weight when compared to previously known arrangements.
The present invention will now be described, by way of example, with reference to the accovpanying drawings, in which:
Figure 1 is a perspective view of a hydraulic damper in accordance with the present invent ion; Figure 2 is a cross-sectional view of the hydraulic damper of Figure 1 with the spring seat, stabiliser bar connector and their attachment arrangement omitted for clarity;
Figure 3 is a cross-sectional view of the spring seat, stabiliser bar connector and extruded tube of the hydraulic damper of Figure 1;
Figure 4 is a perspective view of the stabilises bar connector shown in Figure 3J and
Figure 5 is a cross-sectional view of apparatus for forming the bead shown in Figure 3.
Referring to Figure 2 of the drawings, the hydraulic damper 10 shown is of the twin tube damper type, and comprises an outer tube 12, and an inner tube 14 substantially coaxial with the outer tube on an axis L. The outer tube 12, and preferably the inner tube 14, are formed from extruded aluminium or aluminium alloy. The inner tube 14 has a substantially constant cross-section along its length.
The hydraulic damper 10 further comprises conventional components such as a piston assembly 16, a piston rod 18 having a longitudinal axis on axis L, a compensation valve 20, and a rod guide 22. The piston assembly 16 includes a compression valve and a rebound valve (not shown). Tha piston assembly 16, the compensation valve 20 and the rod guide 22 may be any suitable conventional design well known to those skilled in the art, and will not be described in detail.The inner tube 14 is substantially closed at one end 24 by the compensation valve 2D, and is substantially closed at the other end 26 by the rod guide 22, The outer tube 12 is closed at one end 28 by flame heating and rolling the outer tube walls, and is substantially closed at the other end 30 (the open end) by the rod guide 22 and by spin closing the end 30 of the outer tube.An example of apparatus suitable for spin closing is disclosed in our patent application no. 9412806.3, incorporated herein by reference, in which a pair of rollers initially push a portion of the outer tube at the open end over at approximately 45', and a second pair of rollers than push a sect: ion of the portion over at approximately 90n, whilst the outer tube is spinning about its longitudinal axis. The piston rod iS extends through, and makes a sealing sliding fit with the rod guide 22.
The piston assembly 16 makes a sealing sliding fit with the inner surface 32 of the inner tube 14. The piston rod 18 is secured to the piston assembly 16 by a nut 34 or any other suitable means. The piston assembly 16 divides the inner area of the inner tube 14 into a rebound chamber 36 and a compression chamber 38. The area between the inner tube 14 and the outer tube 12 defines a compensation chamber 40. The rebound and compression chambers 36 and 3B are substantially filled with fluid to damp reciprocating movement of the piston assembly 16 and piston rod 18 along axis L relative to the outer and inner tubes 12 and 14. The compensation chamber 40 is partly filled with fluid and acts as a reservoir for the fluid in the rebound and compression chamber 36 and 39.
The hydraulic damper 10 is mounted in a motor vehicle (not shown) using mounting means in the form of a mounting bracket 46. The mounting bracket 46 is extruded from aluminium or aluminium alloy to integrally form a tubular portion 43 with a pair of spaced arms 42 which are substantially parallel. The tubular portion 43 has an internal diameter which is sized to make a close sliding fit on the outer tube 12. Plr of holes 44 are cut in each arm 42 to form mounting apertures for the mounting bracket 46. The mounting bracket 46 is then slid into position on the outer tube 12, and is secured in place by pressing or punching a tangentially extending groove 47 in the tubular portion 43 and the outer tube 12.Other forms of mounting means may be used as an alternative to the bracket 46, or other attachment arrangements may be used besides the groove 47, As an alternative to flame heating and rolling closed the one end 28 of the outer tube 12, the one end may be sealed and closed by a separately formed end plate or by flattening the one end of the outer tube into a substantially planar formation, and then rolling the planar formation in the longitudinal direction. As a further alternative, however, a mounting means of aluminium or aluminium alloy may be cast with an integral end cap and secured to the one end of the extruded tube to seal and close the one end.
A stabiliser bar connector SO is secured to the outer tube 12. The stabiliser bar connector 80 is required in certain uses of the hydraulic damper 10 for attaching a stabiliser bar (not shown) between the hydraulic damper and the motor vehicle. The stabiliser bar connector 80, as shown in Figures 3 and 4, is of aluminium or aluminium alloy and is preferably formed by extrusion and then cut, bored and/or drilled to the required shape. Alternatively, the stabiliser bar connector may be formed by casting or by any other suitable means.The arrangement for securing the stabiliser bar connector 80 to the outer tube 12 comprises squeezing a portion 92 of the outer tube between the position required for the stabiliser bar connector and the other end 30 of the outer tube in suitable dies. This squeezing action reduces the diameter of the outer tube 12 at the portion 82 and forms a shoulder B4 in the outer surface 86 of the outer tube.The shoulder 84 is preferably at an angle to the longitudinal axis L. The stabiliser bar connector 80 is formed with a cylindrical portion 8e having a through bore 90 which has an internal shape and izo which is substantially the same as the external shape and size of the portion 82 of the outer tube 12 between the shoulder 84 and the other end 30 that is, the stabiliser bar connector SO can make a close sliding fit on the portion 82 of the outer tube.
A shoulder 92 is formed in the through bore 90 which substantially corresponds to the shape and size of the shoulder 84 formed in the external surface 86 of the outer tube 12, The cylindrical portion 88 of the stabiliser bar connector SO has an external extension 94 with an aperture 96 for attachment of a stabiliser bar (not shown) . The stabilises bar connector 80 is alid into the required position on the outer tube 12 from the other end 30 thereof and then subjected to a force in the direction of the longitudinal axis L to form an interference fit between the shoulders 84,92.
The force is preferably high enough to effect a fit at the shoulders 84,92 which prevent subsequent rotation of the stabiliser bar connector So relative to the outer tube 12 about the longitudinal axis L. An external, circumforentially extending, bead 48 is formed in the outer tube 12, preferably as described below, between the stabiliser bar connector SO and the other end 30 of the outer tube to substantially prevent the stabiliser bar connector from moving in a direction along the longitudinal axis L relative to the outer tube towards the other end 30.The stabiliser bar connector 80 may be secured to the outer tube 12 in any other suitable manner, for example, by forming external. circumferentially extending. beads, similar to bead 48, in the outer tube at either end of the stabiliser bar connector.
A spring seat 5 0 is attached to the outer tube 12 as shown in Figures 1 and 3. The spring seat 50, which is of aluminium or aluminium alloy, is formed by pressing or casting and includes a cylindrical section 52 which has an internal shape and size which is substantially the same as the external shape and size of the portion 8a of the outer tube 12 between the shoulder 84 and the other end 30 - that is, the cylindrical section can make a close sliding fit on the portion 82 of the outer tube. The spring seat 50 is slid onto the outer tube 12, with the tube passing through the cylindrical section 52. One end 54 of the cylindrical section rests on the bead 48.A second external, circumferentially extending, bead (not shown) may be formed in the outer tube 12 adjacent the other end 58 of the cylindrical section 52 to secure the spring seat 50 on the outer tube.
The second bead is optional and may be omitted because, in use, a coil spring (not shown) acts on the spring saat 50 to bias the one end 54 of the cylindrical section 52 into contact with the bead 48.
The external clrcumferentially extending bead 48 of Figure 3 is preferably formed as shown in
Figure 5 by positioning one end of the extruded tube 12 in a die 70 having a correspondingly shaped closed bore 72, and by positioning a pair of substantially identical dies 74 having substantially semi-circular grooves 76 therein around the extruded tube but slightly spaced from che die 70. The dies 74 are then moved towards one another to grip the extruded tube 12 and the die 70 moved towards the dies 74 to form the bead 48, the relative movement between the dies being indicated by the arrows in Figure 5. In a preferred arrangement, the spring seat 50 of Figure 3 is slid into position on the outer tube 12 before the formation of the bead 48. The bead 48 is then formed as described above.This arrangement reduces the risk of the outer tuba la expanding adjacent the bead 48 (because of the presence of the cylindrical section 52 of the spring seat 50) and causing problems with any subsequent attempt to slide the spring seat into position.
As an alternative to this arrangement, the spring seat SO may be secured by forming two rings of external dimples rather than beads, or by rivets, or any other suitable alternative arrangement. Either prior to, or after, attachment of the spring seat 50, the one end 28 of the outer tube 12 is closed. Having formed the outer tube 12 with the mounting bracket 46 the spring scant 50, and the stabiliser bar connector 80 secured thereto, and having closed the one end 28, the other components (as described above) of the hydraulic damper 10 can then be assembled therein.
Whilst the above described embodiments refer to the twin tube type of hydraulic damper, it will be appreciated that at least aome of these arrangements are also applicable to hydraulic dampers of the monotube type in which the sole tube of the damper is formed from extruded aluminium or aluminium alloy and has an aluminium or aluminium alloy stabiliser bar connector secured thereon.
Preferably the extruded tube and the stabilising bar connector are formed from aluminium alloy conforming to ES 6082 and which comprises, by weight percentage, 0.70 to 1.3% Si, 0.5 Fe, O Cu, 0.4 to 1,0 Mn, 0.6 to 1.2* Mg, 0.256 Cr, 0.26 Zn, o.1* Ti, 0.05 to 0.15% impurities, with the remainder being aluminium. Other compositions of aluminium alloy may be used.
All of the above described arrangements have advantages in terms of easier manufacture and assembly, and of providing a hydraulic damper of reduced weight compared to previously known arrangement.
Attention is drawn to our patent application nos. 9420639.8 and 9420640.6, filed the 13 October 1994.
Claims (12)
1. A hydraulic damper for a motor vehicle comprising a longitudinally extending tube and a separately formed stabiliser bar connector secured to the tube, wherein the tube is formed from extruded aluminium or aluminium alloy, and the stabiliser bar connector in formed from aluminium or aluminium alloy.
2. A hydraulic damper as claimed in Claim 1, wherein the stabiliser bar connector comprises a cylindrical portion which overlies a portion of the extruded tube.
3. A hydraulic damper as claimed in Claim 2, wherein the cylindrical portion of the stabiliser bar connector has an internal shoulder, and wherein the tube has a correspondig external shoulder, the shoulders being in contact with one another.
4. A hydraulic damper as claimed in Claim 3, wherein the shoulders are at an angle to the extruded tube and the cylindrical portion of the stabilier bar connector.
5. A methcd of forming a hydraulic damper comprising extruding a tube of aluminium or aluminium alloy; forming a stabiLlser bar connector of aluminium or aluminium alloy; and securing the stabiliser bar connector on the extruded tube,
6. A method as claimed in Claim 5, wherein the stabiliser bar connector is formed by extruding a substanrially cylindrical portion with an external extension, and cutting an aperture in the extension.
7. A method as claimed in Claim 5 or Claim 6, in which the stabiliser bar connector includes a cylindrical portion, further comprising farming an internal circumferentially extending shoulder in the cylindrical portion; forming an external circumferentially extending shoulder in the extruded tube; and sliding the stabiliser bar connector onto the extruded tube until the shoulders engage.
8. A method as claimed in Claim 7, further comprising applying a force between the stabiliser bar connector and the extruded tube to form an interference fit between the stabiliser bar connector and the extruded tube at the shoulders.
9. A method as claimed in Claim a, further comprising forming an external circumferentiaily extending bead in the extruded tube to secure the stabiliser bar connector between the bead and the shoulder on the extruded tube.
10, A method as claimed in any one of lairs 7 to 9, wherein the shoulder on the extruded tube is formed by squeezing a portion of the extruded tube to reduce the diameter of the extruded tube at the portion thereof.
11. A method substantially as hereinbefore described with reference to the accompanying drawings.
12. A hydraulic damper substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9502736A GB2297819A (en) | 1995-02-13 | 1995-02-13 | Vehicle hydraulic damper with tube and stabiliser bar connector both of aluminium or aluminium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9502736A GB2297819A (en) | 1995-02-13 | 1995-02-13 | Vehicle hydraulic damper with tube and stabiliser bar connector both of aluminium or aluminium alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9502736D0 GB9502736D0 (en) | 1995-03-29 |
| GB2297819A true GB2297819A (en) | 1996-08-14 |
Family
ID=10769485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9502736A Withdrawn GB2297819A (en) | 1995-02-13 | 1995-02-13 | Vehicle hydraulic damper with tube and stabiliser bar connector both of aluminium or aluminium alloy |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2297819A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2324588A (en) * | 1995-04-28 | 1998-10-28 | Mannesmann Sachs Ag | Vibration damper |
| US5848676A (en) * | 1995-04-28 | 1998-12-15 | Fichtel & Sachs Ag | Shock absorbing strut with an aluminum container for a motor vehicle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2283711A (en) * | 1993-11-09 | 1995-05-17 | Acg France | Hydraulic damper |
-
1995
- 1995-02-13 GB GB9502736A patent/GB2297819A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2283711A (en) * | 1993-11-09 | 1995-05-17 | Acg France | Hydraulic damper |
| GB2283712A (en) * | 1993-11-09 | 1995-05-17 | Acg France | Hydraulic damper |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2324588A (en) * | 1995-04-28 | 1998-10-28 | Mannesmann Sachs Ag | Vibration damper |
| US5848676A (en) * | 1995-04-28 | 1998-12-15 | Fichtel & Sachs Ag | Shock absorbing strut with an aluminum container for a motor vehicle |
| GB2324588B (en) * | 1995-04-28 | 1999-01-06 | Mannesmann Sachs Ag | Vibration damper |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9502736D0 (en) | 1995-03-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |