WO2006019907A1 - Shock absorber with integrated displacement sensor - Google Patents

Shock absorber with integrated displacement sensor Download PDF

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Publication number
WO2006019907A1
WO2006019907A1 PCT/US2005/024986 US2005024986W WO2006019907A1 WO 2006019907 A1 WO2006019907 A1 WO 2006019907A1 US 2005024986 W US2005024986 W US 2005024986W WO 2006019907 A1 WO2006019907 A1 WO 2006019907A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston rod
shock absorber
magnetic phase
displacement sensor
cylinder
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.)
Ceased
Application number
PCT/US2005/024986
Other languages
French (fr)
Inventor
Geert Sas
Mario Maes
Xavier Lauwerys
Pol Mermans
David Chiaradia
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tenneco Automotive Operating Co Inc
Original Assignee
Tenneco Automotive Operating Co Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tenneco Automotive Operating Co Inc filed Critical Tenneco Automotive Operating Co Inc
Priority to CN2005800235665A priority Critical patent/CN1985104B/en
Priority to KR1020077000892A priority patent/KR101253361B1/en
Priority to JP2007521635A priority patent/JP4713584B2/en
Priority to GB0700333A priority patent/GB2429757B/en
Priority to DE112005001650T priority patent/DE112005001650B4/en
Publication of WO2006019907A1 publication Critical patent/WO2006019907A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • B60G17/019—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the type of sensor or the arrangement thereof
    • B60G17/01933—Velocity, e.g. relative velocity-displacement sensors
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • 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
    • 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
    • F16F9/3207—Constructional features
    • F16F9/3221—Constructional features of piston rods
    • 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
    • F16F9/3292—Sensor arrangements
    • 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
    • B60G2204/11—Mounting of sensors thereon
    • B60G2204/112—Mounting of sensors thereon on dampers, e.g. fluid dampers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/25—Stroke; Height; Displacement
    • B60G2400/252—Stroke; Height; Displacement vertical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2401/00—Indexing codes relating to the type of sensors based on the principle of their operation
    • B60G2401/17—Magnetic/Electromagnetic

Definitions

  • One embodiment of the present invention is directed to a shock absorber for a vehicle. More particularly, one embodiment of the present invention is directed to a shock absorber for a vehicle that includes an integrated displacement sensor.
  • a number of vehicle/automotive applications require as an input signal the distance between the vehicle body (i.e., the sprung mass) and the suspension (i.e., the non-sprung mass).
  • Examples of such applications include automated vehicle leveling systems, semi-active and active suspension systems, and leveling systems for high-intensity discharge headlights.
  • the input signal is usually provided by separately mounted displacement sensors. These sensors are typically mounted on the sprung mass with a bracket and connected to the non-sprung mass by means of a connecting rod and bracket. Each of these sensors is separately connected to the electrical system of the vehicle by means of its dedicated wiring loom.
  • One embodiment of the present invention is a shock absorber that includes a cylinder, a piston rod coupled to the cylinder, and a piston coupled to the piston rod.
  • the piston rod is magnetically encoded so that it includes a plurality of magnetic phase shifts. The phase shifts allow the position of the piston rod relative to the cylinder to be determined so that it can function as a displacement sensor.
  • FIG. 1 is a cut-away diagram of a shock absorber in accordance with one embodiment of present invention.
  • Fig. 2 is a profile view of a piston rod and illustrates manufacturing steps for magnetic encoding in accordance with one embodiment of the present invention.
  • Fig. 3 is a profile view of a piston rod and illustrates manufacturing steps for magnetic encoding in accordance with one embodiment of the present invention.
  • Fig. 4 is a profile view of a piston rod with an integrated displacement sensor in accordance with one embodiment of the present invention.
  • Fig. 5 is a profile view of a piston rod and illustrates manufacturing steps for magnetic encoding in accordance with one embodiment of the present invention.
  • Fig. 6 is a profile view of a piston rod and tube assembly and illustrates multiple embodiments of the assembly of a stainless steel tube over the rod.
  • Fig. 7 is a profile view of a piston rod and tube assembly and illustrates multiple embodiments of the assembly of an aluminum tube over the rod.
  • Fig. 8 is a profile view of a piston rod and tube assembly and illustrates another embodiment of the assembly of a stainless steel tube over a rod.
  • One embodiment of the present invention is a shock absorber mounted on a vehicle that has a piston rod that is magnetically encoded.
  • the magnetically encoded piston rod allows the position of the piston rod relative to the shock absorber cylinder to be determined, thus providing a displacement sensor integrated into the shock absorber for the vehicle.
  • Fig. 1 is a cut-away diagram of a shock absorber 10 in accordance with one embodiment of present invention.
  • Shock absorber 10 includes a piston 12, a cylinder 14, a piston rod 16, and oil 18.
  • Shock absorber 10 functions in a known manner to absorb shock in a vehicle.
  • Piston rod 16 is encoded with magnetic material 20 that allows shock absorber 10 to also function as a displacement sensor.
  • the encoded magnetic material 20 of piston rod 16 produces local material phase changes at the surface of piston rod 16, which results into transitions of material phases with high and low magnetic permeability.
  • the transitions can be detected by means of known magnetic sensor techniques, and piston rod 16 can be used as part of a displacement sensor that is integrated into shock absorber 10.
  • known magnetic sensor techniques is disclosed in French patent application no. 04-02175, filed on March 3, 2004 and entitled "Dispositif telescopique Malawi electromagnetique de position" (publication no. ).
  • a groove profile is milled in the surface of piston rod 26.
  • the upper parts of the grooves are deformed by means of a hammering or other compressing operation, providing the required local phase change.
  • the flattened profile of the rod is grinded flat to a requested diameter and roughness.
  • Fig. 3 is a profile view of a piston rod 36 and illustrates manufacturing steps for magnetic encoding in accordance with one embodiment of the present invention.
  • piston rod 36 is formed from of stainless steel.
  • piston rod 36 can be formed from any material which is susceptible to phase changes under influence of cold deformation or other type of deformation.
  • step 30 On the initial rod surface (step 30), a groove profile is deformed into the surface of piston rod 36 (step 32), providing the needed deformation for the local material phase change.
  • step 34 rod 36 is grinded to the required diameter, eliminating the peaks of the applied deformation and giving the magnetic profile.
  • the material phase under the deformed portions 38 of the surface of piston rod 36 will have a different relative magnetic permeability as the initial material phase and will provide the magnetic encoding.
  • Fig. 4 is a profile view of a piston rod 46 with an integrated displacement sensor in accordance with one embodiment of the present invention.
  • piston rod 46 is formed from stainless steel.
  • piston rod 46 is manufactured as follows: a mask 42 is mounted on the surface of piston rod 46. The not masked parts of rod 16 are cooled down to a temperature of at least M 8 (the start of the martensitic transformation). Due to the local cooling of the material the present phase will shift to a different phase and have a different magnetic permeability. Rod 16 is further grinded to the correct diameter and straightness.
  • Fig. 5 is a profile view of a piston rod 56 and illustrates manufacturing steps for magnetic encoding in accordance with one embodiment of the present invention.
  • piston rod 56 is formed from stainless steel.
  • grooves are made in the surface of the piston rod.
  • these grooves are filled by means of a thermal spraying technique, using as spray filler material a material with a significant different relative magnetic permeability compared to the piston rod material.
  • the excessive filler material is grinded, providing the rod its final diameter and roughness.
  • a surface treatment is added to the rod to provide the needed surface hardness, corrosion resistance and wear resistance.
  • Embodiments of the piston rod with an integrated displacement sensor can be formed from a stainless steel rod.
  • a low carbon, hard chrome plated rod that is typically used in a shock absorber can be used in conjunction with the assembly of an aluminum or a stainless steel tube over the rod, as disclosed below.
  • Fig. 6 is a profile view of a piston rod and tube assembly and illustrates multiple embodiments of the assembly of a stainless steel tube over the rod.
  • a thin stainless steel tube 61 is assembled over a rod core 63.
  • the fixation of the thin stainless steel tube can be done in different ways: heating up the tube and press fitting it on the steel core (step 60); welding the tube on the steel core (step 62); or mechanical fixation of the tube on the steel core (step 64).
  • the assembly can be heat treated or surface treated in order to increase the surface roughness.
  • Fig. 7 is a profile view of a piston rod and tube assembly and illustrates multiple embodiments of the assembly of an aluminum tube over the rod.
  • An aluminum thin tube is anodized in order to achieve the needed surface hardness.
  • An anodized aluminum tube 73 is assembled over a steel core rod 71 and fixed at the stem end side with a rubber seal 74. Fixation at the piston post side can be done in different ways including welding the tube on the steel core (step 70) and mechanical fixation of the tube on the steel core (step 72).
  • Fig. 8 is a profile view of a piston rod and tube assembly and illustrates another embodiment of the assembly of a stainless steel tube over a rod.
  • a thin stainless steel tube 80 is slid over a steel metal core 82.
  • the tube is positioned on the rod core by means of a collar (rebound stop) 84 which is resistance welded to the steel rod core.
  • a collar (rebound stop) 84 which is resistance welded to the steel rod core.
  • O-ring 86 O-ring
  • Fixation of the stainless steel tube can be done by means of the top mount fixation, welding of the stainless steel tube to the rod core or mechanical fixation between stainless steel tube and rod core.
  • shock absorber having a piston rod that is magnetically encoded allow the shock absorber to function as a displacement sensor, without requiring a large number of parts, multiple sensors, and calibration of the sensor after it is installed on the vehicle.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Fluid-Damping Devices (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

A shock absorber (10) include a cylinder (14), a piston rod (16 ) coupled to the cylinder, and a piston coupled to the piston rod (16). The piston rod is magnetically encoded so that it includes a plurality of magnetic phase shifts. The phase shifts allow the position of the piston rod relative to the cylinder to be determined so that it can function as a displacement sensor.

Description

SHOCK ABSORBER WITH INTEGRATED DISPLACEMENT SENSOR
RELATED APPLICATIONS
[0001]This application claims the benefit of U.S. Provisional Patent Application No. 60/587,552 filed July 14, 2004, the specification of which is herein incorporated by reference.
FIELD OF THE INVENTION
[0002] One embodiment of the present invention is directed to a shock absorber for a vehicle. More particularly, one embodiment of the present invention is directed to a shock absorber for a vehicle that includes an integrated displacement sensor. BACKGROUND INFORMATION
[0003] A number of vehicle/automotive applications require as an input signal the distance between the vehicle body (i.e., the sprung mass) and the suspension (i.e., the non-sprung mass). Examples of such applications include automated vehicle leveling systems, semi-active and active suspension systems, and leveling systems for high-intensity discharge headlights.
[0004] In known applications, the input signal is usually provided by separately mounted displacement sensors. These sensors are typically mounted on the sprung mass with a bracket and connected to the non-sprung mass by means of a connecting rod and bracket. Each of these sensors is separately connected to the electrical system of the vehicle by means of its dedicated wiring loom.
[0005] However, known displacement sensors such as described above can be expensive due to the large number of parts involved, the amount of labor required to mount the sensor, and the necessity of calibrating the sensor after the vehicle exits the manufacturing production line.
[0006] Based on the foregoing, there is a need for a displacement sensor that has a reduced number of parts and requires a reduced amount of labor and calibration.
SUMMARY OF THE INVENTION
[0007] One embodiment of the present invention is a shock absorber that includes a cylinder, a piston rod coupled to the cylinder, and a piston coupled to the piston rod. The piston rod is magnetically encoded so that it includes a plurality of magnetic phase shifts. The phase shifts allow the position of the piston rod relative to the cylinder to be determined so that it can function as a displacement sensor.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Fig. 1 is a cut-away diagram of a shock absorber in accordance with one embodiment of present invention.
[0009] Fig. 2 is a profile view of a piston rod and illustrates manufacturing steps for magnetic encoding in accordance with one embodiment of the present invention.
[0010] Fig. 3 is a profile view of a piston rod and illustrates manufacturing steps for magnetic encoding in accordance with one embodiment of the present invention.
[0011] Fig. 4 is a profile view of a piston rod with an integrated displacement sensor in accordance with one embodiment of the present invention.
[0012] Fig. 5 is a profile view of a piston rod and illustrates manufacturing steps for magnetic encoding in accordance with one embodiment of the present invention.
[0013] Fig. 6 is a profile view of a piston rod and tube assembly and illustrates multiple embodiments of the assembly of a stainless steel tube over the rod.
[0014] Fig. 7 is a profile view of a piston rod and tube assembly and illustrates multiple embodiments of the assembly of an aluminum tube over the rod.
[0015] Fig. 8 is a profile view of a piston rod and tube assembly and illustrates another embodiment of the assembly of a stainless steel tube over a rod.
DETAILED DESCRIPTION
[0016] One embodiment of the present invention is a shock absorber mounted on a vehicle that has a piston rod that is magnetically encoded. The magnetically encoded piston rod allows the position of the piston rod relative to the shock absorber cylinder to be determined, thus providing a displacement sensor integrated into the shock absorber for the vehicle.
[0017] Fig. 1 is a cut-away diagram of a shock absorber 10 in accordance with one embodiment of present invention. Shock absorber 10 includes a piston 12, a cylinder 14, a piston rod 16, and oil 18. Shock absorber 10 functions in a known manner to absorb shock in a vehicle.
[0018] Piston rod 16 is encoded with magnetic material 20 that allows shock absorber 10 to also function as a displacement sensor. The encoded magnetic material 20 of piston rod 16 produces local material phase changes at the surface of piston rod 16, which results into transitions of material phases with high and low magnetic permeability. When the difference in magnetic susceptibility is high enough, the transitions can be detected by means of known magnetic sensor techniques, and piston rod 16 can be used as part of a displacement sensor that is integrated into shock absorber 10. One example of known magnetic sensor techniques is disclosed in French patent application no. 04-02175, filed on March 3, 2004 and entitled "Dispositif telescopique avec detection electromagnetique de position" (publication no. ).
[0019] Fig. 2 is a profile view of a piston rod 26 and illustrates manufacturing steps for magnetic encoding in accordance with one embodiment of the present invention. In one embodiment, piston rod 26 is formed from stainless steel. In other embodiments, piston rod 26 can be formed from any material which is susceptible to phase changes under influence of cold deformation or other type of deformation.
[0020] At step 20, a groove profile is milled in the surface of piston rod 26. At step 22, the upper parts of the grooves are deformed by means of a hammering or other compressing operation, providing the required local phase change. Finally, at step 24, after the hammering operation, the flattened profile of the rod is grinded flat to a requested diameter and roughness. As a result, the material phase under the deformed portions 28 of the surface of piston rod 26 will
have a different relative magnetic permeability ("μr") as the initial material phase
and will provide the magnetic encoding.
[0021] Fig. 3 is a profile view of a piston rod 36 and illustrates manufacturing steps for magnetic encoding in accordance with one embodiment of the present invention. In one embodiment, piston rod 36 is formed from of stainless steel. In other embodiments, piston rod 36 can be formed from any material which is susceptible to phase changes under influence of cold deformation or other type of deformation.
[0022] On the initial rod surface (step 30), a groove profile is deformed into the surface of piston rod 36 (step 32), providing the needed deformation for the local material phase change. At step 34, rod 36 is grinded to the required diameter, eliminating the peaks of the applied deformation and giving the magnetic profile. As a result, the material phase under the deformed portions 38 of the surface of piston rod 36 will have a different relative magnetic permeability as the initial material phase and will provide the magnetic encoding.
[0023] Fig. 4 is a profile view of a piston rod 46 with an integrated displacement sensor in accordance with one embodiment of the present invention. In one embodiment, piston rod 46 is formed from stainless steel. In one embodiment, piston rod 46 is manufactured as follows: a mask 42 is mounted on the surface of piston rod 46. The not masked parts of rod 16 are cooled down to a temperature of at least M8 (the start of the martensitic transformation). Due to the local cooling of the material the present phase will shift to a different phase and have a different magnetic permeability. Rod 16 is further grinded to the correct diameter and straightness.
[0024] Fig. 5 is a profile view of a piston rod 56 and illustrates manufacturing steps for magnetic encoding in accordance with one embodiment of the present invention. In one embodiment, piston rod 56 is formed from stainless steel.
[0025] At step 50, grooves are made in the surface of the piston rod. At step 52, these grooves are filled by means of a thermal spraying technique, using as spray filler material a material with a significant different relative magnetic permeability compared to the piston rod material. At step 54, the excessive filler material is grinded, providing the rod its final diameter and roughness. At step 58, as an optional final step, a surface treatment is added to the rod to provide the needed surface hardness, corrosion resistance and wear resistance.
[0026] Embodiments of the piston rod with an integrated displacement sensor can be formed from a stainless steel rod. However, in other embodiments, a low carbon, hard chrome plated rod that is typically used in a shock absorber can be used in conjunction with the assembly of an aluminum or a stainless steel tube over the rod, as disclosed below.
[0027] Fig. 6 is a profile view of a piston rod and tube assembly and illustrates multiple embodiments of the assembly of a stainless steel tube over the rod. First, a thin stainless steel tube 61 is assembled over a rod core 63. The fixation of the thin stainless steel tube can be done in different ways: heating up the tube and press fitting it on the steel core (step 60); welding the tube on the steel core (step 62); or mechanical fixation of the tube on the steel core (step 64). In one embodiment, after the fixation of the tube to the rod core, the assembly can be heat treated or surface treated in order to increase the surface roughness.
[0028] Fig. 7 is a profile view of a piston rod and tube assembly and illustrates multiple embodiments of the assembly of an aluminum tube over the rod. An aluminum thin tube is anodized in order to achieve the needed surface hardness. An anodized aluminum tube 73 is assembled over a steel core rod 71 and fixed at the stem end side with a rubber seal 74. Fixation at the piston post side can be done in different ways including welding the tube on the steel core (step 70) and mechanical fixation of the tube on the steel core (step 72).
[0029] Fig. 8 is a profile view of a piston rod and tube assembly and illustrates another embodiment of the assembly of a stainless steel tube over a rod. A thin stainless steel tube 80 is slid over a steel metal core 82. The tube is positioned on the rod core by means of a collar (rebound stop) 84 which is resistance welded to the steel rod core. At the other side the opening between stainless steel tube and steel core is sealed by means of an O-ring 86. Fixation of the stainless steel tube can be done by means of the top mount fixation, welding of the stainless steel tube to the rod core or mechanical fixation between stainless steel tube and rod core.
[003O]As described, embodiments of the present invention of a shock absorber having a piston rod that is magnetically encoded allow the shock absorber to function as a displacement sensor, without requiring a large number of parts, multiple sensors, and calibration of the sensor after it is installed on the vehicle.
[0031] Several embodiments of the present invention are specifically illustrated and/or described herein. However, it will be appreciated that modifications and variations of the present invention are covered by the above teachings and within the purview of the appended claims without departing from the spirit and intended scope of the invention.

Claims

WHAT IS CLAIMED IS:
1. A shock absorber comprising: a cylinder; a piston rod coupled to said cylinder; and a piston coupled to said piston rod; wherein said piston rod comprises a first portion of a first magnetic phase and a second portion of a second magnetic phase.
2. The shock absorber of claim 1 , wherein said piston rod comprises a surface, and wherein said first portion is formed by deforming a part of said surface.
3. The shock absorber of claim 1 , wherein said first portion is formed by cooling a portion of said piston rod.
4. The shock absorber of claim 1 , wherein said first portion is formed by forming a first groove in said piston rod and filling said first groove with a material having a different magnetic phase than said piston rod.
5. The shock absorber of claim 1 , wherein said piston rod is a stainless steel rod.
6. The shock absorber of claim 1 , wherein said piston rod comprises a stainless steel tube fastened to a steel core.
7. The shock absorber of claim 1 , wherein said piston rod comprises an aluminum tube fastened to a steel core.
8. The shock absorber of claim 1 , further comprising circuitry to detect a magnetic transition between said first portion and said second portion to calculate a displacement of said piston rod in said cylinder.
9. A method of sensing displacement of a vehicle comprising: detecting at least one transition of a magnetic phase shift on a shock absorber piston rod; calculating a first displacement of the piston rod within a shock absorber cylinder based on the transition; and calculating a second displacement of the vehicle based on the first displacement.
10. The method of claim 9, wherein said piston rod comprises a first portion of a first magnetic phase and a second portion of a second magnetic phase.
11. The method of claim 10, wherein said piston rod comprises a surface, and wherein said first portion is formed by deforming a part of said surface.
12. The method of claim 10, wherein said first portion is formed by cooling a portion of said piston rod.
13. The method of claim 10, wherein said first portion is formed by forming a first groove in said piston rod and filling said first groove with a material having a different magnetic phase than said piston rod.
14. A displacement sensor for a vehicle comprising: a shock absorber cylinder; a piston rod disposed within said cylinder; a first magnetic phase portion disposed on said piston rod; and a second magnetic phase portion disposed on said piston rod.
15. The displacement sensor of claim 14, wherein said first magnetic phase portion has a different magnetic phase than said second magnetic phase portion.
16. The displacement sensor of claim 14, wherein said first magnetic phase portion has a different relative magnetic permeability than said second magnetic phase portion.
17. The displacement sensor of claim 14, wherein said first magnetic phase portion is formed by cooling a portion of said piston rod.
18. The displacement sensor of claim 14, wherein said first magnetic phase portion is formed by forming a first groove in said piston rod and filling said first groove with a material having a different magnetic phase than said piston rod.
PCT/US2005/024986 2004-07-14 2005-07-14 Shock absorber with integrated displacement sensor Ceased WO2006019907A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN2005800235665A CN1985104B (en) 2004-07-14 2005-07-14 Shock absorber with integrated displacement sensor and displacement sensor
KR1020077000892A KR101253361B1 (en) 2004-07-14 2005-07-14 Shock absorber with integrated displacement sensor
JP2007521635A JP4713584B2 (en) 2004-07-14 2005-07-14 Shock absorber with integrated displacement sensor
GB0700333A GB2429757B (en) 2004-07-14 2005-07-14 Shock absorber with integrated displacement sensor
DE112005001650T DE112005001650B4 (en) 2004-07-14 2005-07-14 Shock absorber with integrated displacement sensor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US58755204P 2004-07-14 2004-07-14
US60/587,552 2004-07-14

Publications (1)

Publication Number Publication Date
WO2006019907A1 true WO2006019907A1 (en) 2006-02-23

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Country Status (7)

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US (1) US7493995B2 (en)
JP (1) JP4713584B2 (en)
KR (1) KR101253361B1 (en)
CN (1) CN1985104B (en)
DE (2) DE112005001650B4 (en)
GB (1) GB2429757B (en)
WO (1) WO2006019907A1 (en)

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JP2009002513A (en) * 2007-06-20 2009-01-08 Stabilus Gmbh Position adjustment element
WO2010086582A3 (en) * 2009-01-27 2010-09-23 Renishaw Plc Magnetic encoder scale

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US7621382B2 (en) * 2006-06-28 2009-11-24 Nissan Technical Center North America, Inc. Shock absorber
US7654370B2 (en) * 2007-02-02 2010-02-02 Arvin Technologies, Inc. Shock absorber with integrated position sensor
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