WO2006065197A1 - A holder for a sensor body for a position sensor - Google Patents

A holder for a sensor body for a position sensor Download PDF

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Publication number
WO2006065197A1
WO2006065197A1 PCT/SE2005/001802 SE2005001802W WO2006065197A1 WO 2006065197 A1 WO2006065197 A1 WO 2006065197A1 SE 2005001802 W SE2005001802 W SE 2005001802W WO 2006065197 A1 WO2006065197 A1 WO 2006065197A1
Authority
WO
WIPO (PCT)
Prior art keywords
spring
head
sensor body
holder
sensor
Prior art date
Application number
PCT/SE2005/001802
Other languages
French (fr)
Inventor
Magnus Hagberg
Sten Jiewertz
Original Assignee
Scania Cv Ab (Publ)
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 Scania Cv Ab (Publ) filed Critical Scania Cv Ab (Publ)
Priority to BRPI0517878A priority Critical patent/BRPI0517878B1/en
Priority to DE602005020975T priority patent/DE602005020975D1/en
Priority to US11/719,837 priority patent/US20090145717A1/en
Priority to AT05813311T priority patent/ATE466255T1/en
Priority to EP05813311A priority patent/EP1828721B1/en
Publication of WO2006065197A1 publication Critical patent/WO2006065197A1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/30—Supports specially adapted for an instrument; Supports specially adapted for a set of instruments
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D13/00—Friction clutches
    • F16D13/58—Details
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D25/00—Fluid-actuated clutches
    • F16D25/12—Details not specific to one of the before-mentioned types

Definitions

  • the invention relates to a holder for a sensor body for a position sensor, comprising a holder housing, a circular cylindrical recess with a bottom in the holder housing, a head connected to one end of the sensor body and adapted, concentrically and by being to a limited extent tiltable from a normal position, to being accommodated and fastened in the cylindrical recess, and a compression spring between said head and bottom for flexibly preloading the head towards the normal position.
  • Such a holder is particularly usable for inductive position sensors where the sensor body has a shape of an elongate rod made of a soft iron alloy.
  • the sensor body it is possible for the sensor body to elastically give way without being deformed if it is subjected to mechanical action in the form of pressure and impacts, e.g. when being fitted in or removed from confined spaces in a vehicle.
  • the sensor body can give way without being subject to harmful wear if for any reason it has to be situated obliquely in the duct of a cooperating sensor body in which it moves to and fro during operation.
  • the head is arranged with radial clearance in the recess, with the result that the sensor body may risk being permanently displaced sideways from the normal position by said action, thereby disadvantageously altering the signal characteristic, i.e. the relationship between sensor position and signal amplitude.
  • the known sensor also uses as compression spring an O-ring, which has a relatively steep spring characteristic, thereby risking the sensor body becoming permanently deformed or being subject to harmful wear against a sensor duct wall even after a relatively small elastic giving way.
  • An object of the present invention is therefore to provide a holder of the kind indicated in the introduction which overcomes the shortcomings indicated above of the state of the art. This is achieved by the features indicated in the claims set out below.
  • the head has the shape of a central spherical segment with a diameter corresponding to the diameter of the recess.
  • the sensor body can perform pivoting movements about the centrepoint of the head and only move axially in the sensor duct. It is thus ensured that after relief of spring pressure the sensor body will always revert to the normal position.
  • the compression spring takes the form of a flat wire spring.
  • a flat wire spring in this specification means a compression spring where the spring material is leaf-shaped with the broad sides of the leaf oriented mainly to facing towards the springing direction.
  • Such a spring may with advantage be designed with a very flat spring characteristic which with little fitting depth allows a relatively large, gently resilient giving way of the sensor body, so that the latter does not become deformed and is not subject to wear that would be detrimental to the signal characteristic.
  • the flat wire of the spring is of the type where spring turns have an undulating shape extending in a springing direction of the spring.
  • Such a spring may be made very short and with almost constant spring force.
  • FIG. 1 is a side view of a sensor body which may be combined with a holder according to the invention
  • FIG. 2 is an oblique view from the side, partly in section and with cutaway portions, of the FIG. 1 holder;
  • FIG. 3 is a longitudinal sectional view, with cutaway portions, of the FIG. 1 holder with the sensor body situated obliquely;
  • FIG. 4 is a view obliquely from above on a larger scale of a compression spring usable in a holder according to the invention.
  • the holder 10 for the sensor body 30 in FIG. 1 is depicted only by way of example in the form of a threaded bolt 12 fitted to a schematically illustrated vehicle component 40.
  • the vehicle component 40 may typically be a part 42 of an undepicted gearbox which may perform a linear relative movement with respect to a cooperating sensor body 50 depicted in chain-dotted lines and fitted to another part of the gearbox.
  • the cooperating sensor body 50 has in a conventional manner a cylindrical duct 52 for accommodating a sensor rod 32 of the sensor body 30.
  • the sensor arrangement thus constituted may in a well-known but undepicted manner signal the mutual positions of the parts 42, 54 to control equipment in order, for example, to indicate when various gears of the gearbox are in correct engagement. Many other applications are also possible, however, e.g. for indicating mutual positions between friction linings in a vehicle friction clutch (not depicted).
  • the sensor arrangement is of inductive type and the elongate sensor rod 32 of the sensor body 30 is made of a relatively soft iron alloy, e.g. 50% Fe and 50% Ni.
  • a relatively soft iron alloy e.g. 50% Fe and 50% Ni.
  • the soft sensor body 32 should not become deformed or otherwise become situated obliquely or risk being subject in its movement path to harmful wear in the duct 52 of the cooperating sensor body 50.
  • the holder 10 is adapted to flexibly restraining the sensor body 30 from deflection (FIG. 3) from an axially oriented normal position (FIGS. 1 and 2) as follows.
  • the holder 10 has a holder housing 14 in which there is a drilled hole or a circular cylindrical recess 16 with a bottom 17.
  • the recess 16 is adapted to accommodating a head 36 of one end of the sensor body 30.
  • the head 36 is formed by injection moulding of a plastic material, particularly polyamide containing glass fibre for high abrasion resistance, on an end portion of the sensor rod 32.
  • the sensor rod 32 further has a peripheral groove 34 for positive keying of the cast-on head 36.
  • the head 36 has a shape of a central spherical segment, i.e. with the appearance of an equatorial symmetrical slice of a sphere.
  • the spherical diameter corresponds to the diameter of the recess 16, with the result that the sensor body 30 can to a limited extent be tilted or deflected in all directions from the normal position without the spherical centrepoint of the head 36 deviating from the centreline 19 of the recess 16.
  • a compressive flat wire spring 24 exerts preloading between the bottom 17 of the recess 16 and a base surface of the head 36.
  • the opposite base surface of the head 36 is urged by the preloading force of the spring 24 towards a planar apertured disc 20, which itself abuts in a planar manner against a retaining ring 22 clamped in a peripheral groove 18 of the recess 16.
  • the apertured disc 20 serves to equalise the unevenness in the planar abutment which may be caused by the undepicted opening in the retaining ring 22 which makes it possible for the latter to be inserted in the groove 18.
  • the disc 20 and the retaining ring 22 further have such large central holes that they neither engage with the sensor rod 32 nor hinder the intended deflection of the sensor body 30.
  • flat wire spring means a compression spring where the spring material is leaf-shaped or strip-shaped with the broad sides of the leaf oriented mainly to facing towards the springing direction.
  • a spring may with advantage be made very short, i.e. require very little fitting depth, while at the same time it has a very flat spring characteristic, i.e. the spring force increases only slightly with compression over the whole working range.
  • FIGS. 2 and 3 depict a flat wire spring 24 of conventional helical type, other types of flat wire springs are also possible.
  • FIG. 4 depicts a suitable known flat wire spring 26 of helical type where the spring turns have an undulating shape extending in the springing direction and the tops 28 and bottoms 29 of the undulations abut against one another.
  • Such a flat wire spring need not necessarily be of helical type in one piece, it may also comprise a number of layers of separate undulating spring discs (not depicted) stacked on one another and possibly bonded to one another at the respective tops and bottoms of the undulations.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Springs (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Finger-Pressure Massage (AREA)
  • Vehicle Body Suspensions (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Support Of The Bearing (AREA)

Abstract

Holder (10) for a sensor body (30) for a position sensor, comprising a holder housing (14), a circular cylindrical recess (16) with a bottom (17) in the holder housing, a head (36) firmly connected to one end of the sensor body (30) and adapted, concentrically and by being to a limited extent tiltable from a normal position, to being accommodated and fastened in the cylindrical recess (16), and a compression spring (24; 26) between said head (36) and bottom (17) in order flexibly to preload the head towards the normal position. To ensure that the sensor body (30) cannot permanently change position in the recess (16) and does not risk being subject to wear against a cooperating sensor body, it is proposed inter alia that the head (36) have the shape of a central spherical segment with a diameter corresponding to the diameter of the recess (16) and that the compression spring (24; 26) be a flat wire spring.

Description

Δ holder for a sensor body for a position sensor
TECHNICALFIELD
The invention relates to a holder for a sensor body for a position sensor, comprising a holder housing, a circular cylindrical recess with a bottom in the holder housing, a head connected to one end of the sensor body and adapted, concentrically and by being to a limited extent tiltable from a normal position, to being accommodated and fastened in the cylindrical recess, and a compression spring between said head and bottom for flexibly preloading the head towards the normal position.
Such a holder is particularly usable for inductive position sensors where the sensor body has a shape of an elongate rod made of a soft iron alloy. In such cases it is possible for the sensor body to elastically give way without being deformed if it is subjected to mechanical action in the form of pressure and impacts, e.g. when being fitted in or removed from confined spaces in a vehicle. Above all, however, the sensor body can give way without being subject to harmful wear if for any reason it has to be situated obliquely in the duct of a cooperating sensor body in which it moves to and fro during operation.
BACKGROUND
In such a known holder, the head is arranged with radial clearance in the recess, with the result that the sensor body may risk being permanently displaced sideways from the normal position by said action, thereby disadvantageously altering the signal characteristic, i.e. the relationship between sensor position and signal amplitude. The known sensor also uses as compression spring an O-ring, which has a relatively steep spring characteristic, thereby risking the sensor body becoming permanently deformed or being subject to harmful wear against a sensor duct wall even after a relatively small elastic giving way. SUMMARY OF THE INVENTION
An object of the present invention is therefore to provide a holder of the kind indicated in the introduction which overcomes the shortcomings indicated above of the state of the art. This is achieved by the features indicated in the claims set out below.
According to one version of the invention, the head has the shape of a central spherical segment with a diameter corresponding to the diameter of the recess. This means that the sensor body can perform pivoting movements about the centrepoint of the head and only move axially in the sensor duct. It is thus ensured that after relief of spring pressure the sensor body will always revert to the normal position. Moreover, the compression spring takes the form of a flat wire spring. A flat wire spring in this specification means a compression spring where the spring material is leaf-shaped with the broad sides of the leaf oriented mainly to facing towards the springing direction. Such a spring may with advantage be designed with a very flat spring characteristic which with little fitting depth allows a relatively large, gently resilient giving way of the sensor body, so that the latter does not become deformed and is not subject to wear that would be detrimental to the signal characteristic.
According to one embodiment, the flat wire of the spring is of the type where spring turns have an undulating shape extending in a springing direction of the spring. Such a spring may be made very short and with almost constant spring force.
Other features and advantages of the invention are indicated by the following detailed description and the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view of a sensor body which may be combined with a holder according to the invention; FIG. 2 is an oblique view from the side, partly in section and with cutaway portions, of the FIG. 1 holder;
FIG. 3 is a longitudinal sectional view, with cutaway portions, of the FIG. 1 holder with the sensor body situated obliquely; and
FIG. 4 is a view obliquely from above on a larger scale of a compression spring usable in a holder according to the invention.
DETAILED DESCRIPTION OF AN EMBODIMENT
The holder 10 for the sensor body 30 in FIG. 1 is depicted only by way of example in the form of a threaded bolt 12 fitted to a schematically illustrated vehicle component 40. The vehicle component 40 may typically be a part 42 of an undepicted gearbox which may perform a linear relative movement with respect to a cooperating sensor body 50 depicted in chain-dotted lines and fitted to another part of the gearbox. The cooperating sensor body 50 has in a conventional manner a cylindrical duct 52 for accommodating a sensor rod 32 of the sensor body 30. The sensor arrangement thus constituted may in a well-known but undepicted manner signal the mutual positions of the parts 42, 54 to control equipment in order, for example, to indicate when various gears of the gearbox are in correct engagement. Many other applications are also possible, however, e.g. for indicating mutual positions between friction linings in a vehicle friction clutch (not depicted).
In the example depicted, the sensor arrangement is of inductive type and the elongate sensor rod 32 of the sensor body 30 is made of a relatively soft iron alloy, e.g. 50% Fe and 50% Ni. For maximum possible assurance that the signal characteristic from the sensor arrangement is repeatably constant, it is of great importance that the soft sensor body 32 should not become deformed or otherwise become situated obliquely or risk being subject in its movement path to harmful wear in the duct 52 of the cooperating sensor body 50. To this end, the holder 10 is adapted to flexibly restraining the sensor body 30 from deflection (FIG. 3) from an axially oriented normal position (FIGS. 1 and 2) as follows.
The holder 10 has a holder housing 14 in which there is a drilled hole or a circular cylindrical recess 16 with a bottom 17. The recess 16 is adapted to accommodating a head 36 of one end of the sensor body 30. The head 36 is formed by injection moulding of a plastic material, particularly polyamide containing glass fibre for high abrasion resistance, on an end portion of the sensor rod 32. The sensor rod 32 further has a peripheral groove 34 for positive keying of the cast-on head 36.
As may most clearly be seen in FIG. 3, the head 36 has a shape of a central spherical segment, i.e. with the appearance of an equatorial symmetrical slice of a sphere. The spherical diameter corresponds to the diameter of the recess 16, with the result that the sensor body 30 can to a limited extent be tilted or deflected in all directions from the normal position without the spherical centrepoint of the head 36 deviating from the centreline 19 of the recess 16.
A compressive flat wire spring 24 exerts preloading between the bottom 17 of the recess 16 and a base surface of the head 36. The opposite base surface of the head 36 is urged by the preloading force of the spring 24 towards a planar apertured disc 20, which itself abuts in a planar manner against a retaining ring 22 clamped in a peripheral groove 18 of the recess 16. The apertured disc 20 serves to equalise the unevenness in the planar abutment which may be caused by the undepicted opening in the retaining ring 22 which makes it possible for the latter to be inserted in the groove 18. The disc 20 and the retaining ring 22 further have such large central holes that they neither engage with the sensor rod 32 nor hinder the intended deflection of the sensor body 30.
As indicated above, flat wire spring means a compression spring where the spring material is leaf-shaped or strip-shaped with the broad sides of the leaf oriented mainly to facing towards the springing direction. Such a spring may with advantage be made very short, i.e. require very little fitting depth, while at the same time it has a very flat spring characteristic, i.e. the spring force increases only slightly with compression over the whole working range. Whereas FIGS. 2 and 3 depict a flat wire spring 24 of conventional helical type, other types of flat wire springs are also possible. FIG. 4 depicts a suitable known flat wire spring 26 of helical type where the spring turns have an undulating shape extending in the springing direction and the tops 28 and bottoms 29 of the undulations abut against one another. Such a flat wire spring need not necessarily be of helical type in one piece, it may also comprise a number of layers of separate undulating spring discs (not depicted) stacked on one another and possibly bonded to one another at the respective tops and bottoms of the undulations.

Claims

1. A holder (10) for a sensor body (30) for a position sensor, comprising a holder housing (14); a circular cylindrical recess (16) with a bottom (17) in the holder housing; a head (36) firmly connected to one end of the sensor body (30) and adapted, by being to a limited extent tillable from a normal position, to being accommodated and fastened in the cylindrical recess (16); a compression spring (24; 26) between said head (36) and bottom (17) in order flexibly to preload the head towards the normal position; characterised in that the head (36) has the shape of a central spherical segment with a diameter corresponding to the diameter of the recess (16); and that the compression spring (24; 26) is a flat wire spring.
2. A holder according to claim 1, whereby the flat wire spring is a helical spring (24).
3. A holder according to claim 1 or 2, whereby the flat wire spring (26) is of the type where spring turns have an undulating shape extending in a springing direction of the spring.
4. A holder according to claim 3, whereby the flat wire spring (26) is of the type where respective tops and bottoms of undulations in adjacent spring turns abut against one another.
5. A holder according to any one of the foregoing claims, whereby the head is formed on the end of the sensor body by injection moulding of a plastic material.
6. A holder according to claim 5, whereby the plastic material is polyamide containing glass fibre.
PCT/SE2005/001802 2004-12-14 2005-12-01 A holder for a sensor body for a position sensor WO2006065197A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BRPI0517878A BRPI0517878B1 (en) 2004-12-14 2005-12-01 retainer for a sensor body for a position sensor
DE602005020975T DE602005020975D1 (en) 2004-12-14 2005-12-01 HOLDING DEVICE FOR A SENSOR BODY FOR A POSITION SENSOR
US11/719,837 US20090145717A1 (en) 2004-12-14 2005-12-01 Holder for a sensor body for a position sensor
AT05813311T ATE466255T1 (en) 2004-12-14 2005-12-01 HOLDING DEVICE FOR A SENSOR BODY FOR A POSITION SENSOR
EP05813311A EP1828721B1 (en) 2004-12-14 2005-12-01 A holder for a sensor body for a position sensor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0403022A SE527576C2 (en) 2004-12-14 2004-12-14 Holder for inductive position sensor for vehicle, comprises flat wire spring between head having shape of central spherical segment, and lower portion of recess to preload head towards normal position
SE0403022-7 2004-12-14

Publications (1)

Publication Number Publication Date
WO2006065197A1 true WO2006065197A1 (en) 2006-06-22

Family

ID=33563190

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2005/001802 WO2006065197A1 (en) 2004-12-14 2005-12-01 A holder for a sensor body for a position sensor

Country Status (7)

Country Link
US (1) US20090145717A1 (en)
EP (1) EP1828721B1 (en)
AT (1) ATE466255T1 (en)
BR (1) BRPI0517878B1 (en)
DE (1) DE602005020975D1 (en)
SE (1) SE527576C2 (en)
WO (1) WO2006065197A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0595366A1 (en) * 1988-01-22 1994-05-04 Data Instruments Inc. Linear displacement transducer particularly useful for hydraulic and pneumatic cylinders
SE525792C2 (en) * 2004-07-13 2005-04-26 Scania Cv Abp Position sensor for e.g. automatic vehicle clutch actuator component, comprises movable sensor body in contact free cooperation with stationary sensor body

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3421369A (en) * 1967-01-31 1969-01-14 Gen Dynamics Corp Pressure indicating probe
IT1238266B (en) * 1990-03-06 1993-07-12 Marposs Spa HEAD FOR THE CONTROL OF LINEAR DIMENSIONS OF PIECES.
GB9116044D0 (en) * 1991-07-24 1991-09-11 Nat Res Dev Probes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0595366A1 (en) * 1988-01-22 1994-05-04 Data Instruments Inc. Linear displacement transducer particularly useful for hydraulic and pneumatic cylinders
SE525792C2 (en) * 2004-07-13 2005-04-26 Scania Cv Abp Position sensor for e.g. automatic vehicle clutch actuator component, comprises movable sensor body in contact free cooperation with stationary sensor body
WO2006006916A1 (en) * 2004-07-13 2006-01-19 Scania Cv Ab (Publ) Position sensor for vehicle mechanism

Also Published As

Publication number Publication date
SE0403022D0 (en) 2004-12-14
EP1828721B1 (en) 2010-04-28
ATE466255T1 (en) 2010-05-15
DE602005020975D1 (en) 2010-06-10
US20090145717A1 (en) 2009-06-11
BRPI0517878A (en) 2008-10-21
SE0403022L (en) 2006-04-11
BRPI0517878B1 (en) 2018-05-08
EP1828721A1 (en) 2007-09-05
SE527576C2 (en) 2006-04-11

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