WO2008091217A1 - A force measuring device - Google Patents

A force measuring device Download PDF

Info

Publication number
WO2008091217A1
WO2008091217A1 PCT/SE2008/050081 SE2008050081W WO2008091217A1 WO 2008091217 A1 WO2008091217 A1 WO 2008091217A1 SE 2008050081 W SE2008050081 W SE 2008050081W WO 2008091217 A1 WO2008091217 A1 WO 2008091217A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake pad
insert
brake
force measuring
pad holder
Prior art date
Application number
PCT/SE2008/050081
Other languages
French (fr)
Inventor
Fredrik Blennow
Original Assignee
Faiveley Transport Nordic Ab
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 Faiveley Transport Nordic Ab filed Critical Faiveley Transport Nordic Ab
Publication of WO2008091217A1 publication Critical patent/WO2008091217A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61H—BRAKES OR OTHER RETARDING DEVICES SPECIALLY ADAPTED FOR RAIL VEHICLES; ARRANGEMENT OR DISPOSITION THEREOF IN RAIL VEHICLES
    • B61H5/00—Applications or arrangements of brakes with substantially radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • 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
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
    • F16D65/092—Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes
    • 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
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • 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
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D2066/005—Force, torque, stress or strain

Definitions

  • the present invention relates to a force measuring device for measuring forces at disc braking of a rail vehicle by means of a brake pad attached to a brake pad holder and brakingly engaging a rotating brake disc.
  • the attachment is preferably accomplished in that the insert is provided on its upper side with a dovetail groove for cooperation with a corresponding longitudinal ridge arrangement on the lower side of the brake pad and on its lower side with a longitudinal ridge arrangement for cooperation with a dovetail groove on the upper side of the brake pad holder.
  • the brake pad may be kept in proper position in the insert in that the latter is provided with end closures.
  • the force measuring means preferably comprise elastically yieldable tongues machined out of the insert and strain gauges attached to the tongues.
  • FIG. 1 is an isometric view of a conventional brake pad holder with an insert according to the invention and with a conventional brake pad
  • Fig 2 is an isometric view corresponding to Fig 1 but without the brake pad
  • Fig 3 is an isometric view of only the insert according to the invention seen from above as in Fig 2
  • Fig 2 is an isometric view corresponding to Fig 1 but without the brake pad
  • Fig 3 is an isometric view of only the insert according to the invention seen from above as in Fig 2
  • Fig 2 is an isometric view corresponding to Fig 1 but without the brake pad
  • Fig 3 is an isometric view of only the insert according to the invention seen from above as in Fig 2
  • Fig 4 is a corresponding view of the insert seen from below.
  • a brake disc rotating with an axle is to be brakingly engaged by a brake pad, normally at each axial side of the disc.
  • the replaceable brake pad is attached to a brake pad holder, which is suspended from a member of the vehicle undercarriage or bogie and is normally a part of a disc brake caliper, comprising a brake actuator for supplying a brake force to the brake pad holder substantially transverse to the brake disc.
  • the present invention relates to a force measuring device in connection with the brake pad holder for supplying measurement data regarding forces occurring at brake application of the brake pads against the brake disc.
  • Fig 1 Depicted in Fig 1 is a conventional brake pad holder 1.
  • the brake pad holder has a planar upper surface, against which a planar portion of the lower surface of a brake pad 2 is to bear.
  • this planar upper surface has a longitudinal dovetail groove for cooperation with a corresponding longitudinal ridge arrangement on the lower surface of the brake pad 2.
  • the cooperating groove and ridge arrangement may be defined as attachment means.
  • the dovetail groove of the brake pad holder 1 is open at the short end to the right in the drawing or the lower end in mounted condition.
  • the brake pad holder 1 is here provided with fastening means 3 for a closure device (not shown) for the dovetail groove, so that the brake pad 2 is held in position after mounting.
  • the brake pad holder 1 is also provided with a suspension bore 4 for pivotal suspension of the brake pad holder, as is well known to any person skilled in the art.
  • the bore 4 shall be parallel with the brake disc.
  • an insert 5 is mounted between the brake pad holder 1 and the brake pad 2.
  • the insert 5 is provided on its upper side with a dovetail groove 6 corresponding to the dovetail groove in the brake pad holder 1 and on its lower side with a longitudinal ridge arrangement (Fig 4) corresponding to the ridge arrangement of the brake pad 2 and comprising two longitudinal ridges 7 and an intermediate, somewhat lower portion.
  • Fig 4 a longitudinal ridge arrangement corresponding to the ridge arrangement of the brake pad 2 and comprising two longitudinal ridges 7 and an intermediate, somewhat lower portion.
  • the insert 5 may be mounted between the brake pad holder 1 and the brake pad 2, as is shown in Fig 1.
  • the latter may be held in position in the insert 5 by removable end closures 8 attached to the ends of the insert 5, preferably by screws. (The left end closure 8 in Fig 2 is removed for clearly showing the dovetail shape of the groove 6. )
  • Tongues 9 are machined out of the insert 5 at the dovetail groove 6 and over the ridges 7 at its lower side, for example to shapes shown in the Figures. These tongues 9 may for example be four at each side of a center line of the insert and may be symmetrically arranged. The tongues 9 may elastically yield to a certain extent under forces acting thereon. The central portion of each tongue 9 has a substantially square cross-section and can accordingly yield in two directions: in the longitudinal direction of the insert 5 and perpendicular thereto, i e normal to the insert. These two directions correspond to yield under friction forces and application forces, respectively, at brake application by means of the brake pad attached to the insert 5 on the brake pad holder 1.
  • the yield and thus the forces may be measured by strain gauges 10 attached to the central portion of each tongue 9, preferably at all four sides of the square.
  • the tongues 9 and the strain gauges 10 may together be defined as force measuring means .
  • strain gauges in a bridge for measuring friction force and application force or brake force, respectively.
  • the dovetail groove 6 may be provided with a central longitudinal channel 11 for connecting wires from the strain gauges 10. Wires may leave the insert 5 through bores 12 leading to the channel 11.
  • a cover 13 may be arranged over each pair of tongues 9.
  • Thermo elements 14 may be arranged at the side of the insert 5 for assessing the temperature attained at braking.
  • strain gauges have been shown and described as strain gauges, but other technical solutions are feasible for the person skilled in the art. With the use of strain gauges or similar means the thickness of the insert 5 can be so small that an ordinary brake pad 2 can be used. If not, a brake pad with reduced thickness may be used for the measurement.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

A force measuring device for measuring forces at disc braking of a rail vehicle by means of a brake pad (2) attached to a brake pad holder (1) and brakingly engaging a rotating brake disc comprises an insert (5), which contains force measuring means (9, 10), is to be arranged between the brake pad holder (1) and the brake pad (2) and has similar attachment means (6, 7) as the brake pad holder and the brake pad.

Description

A FORCE MEASURING DEVICE
Technical Field
The present invention relates to a force measuring device for measuring forces at disc braking of a rail vehicle by means of a brake pad attached to a brake pad holder and brakingly engaging a rotating brake disc. Background of the Invention
For different reasons, it may be desirable to measure the forces occurring at such disc braking. Conventionally, it has been customary to measure such forces somewhere in the brake rigging connecting the brake pad holder to a brake actuator.
The main problem is that such measurement, which for example may be performed by means of one or several strain gauges, will not be especially exact, as it is not performed where the forces actually occur. Another problem is that the measurement shall not introduce undue disturbances in the normal braking sequence and shall not be cumbersome and expensive to carry out. The Invention These and other problems are according to the invention solved in that an insert, which contains force measuring means, is to be arranged between the brake pad holder and the brake pad and has similar attachment means as the brake pad holder and the brake pad.
The attachment is preferably accomplished in that the insert is provided on its upper side with a dovetail groove for cooperation with a corresponding longitudinal ridge arrangement on the lower side of the brake pad and on its lower side with a longitudinal ridge arrangement for cooperation with a dovetail groove on the upper side of the brake pad holder. The brake pad may be kept in proper position in the insert in that the latter is provided with end closures.
The force measuring means preferably comprise elastically yieldable tongues machined out of the insert and strain gauges attached to the tongues.
Brief Description of the Drawings
The invention will be described in further detail below under reference to the accompanying drawings, in which Fig 1 is an isometric view of a conventional brake pad holder with an insert according to the invention and with a conventional brake pad,
Fig 2 is an isometric view corresponding to Fig 1 but without the brake pad, Fig 3 is an isometric view of only the insert according to the invention seen from above as in Fig 2, and
Fig 4 is a corresponding view of the insert seen from below.
Detailed Description of an Embodiment In a disc brake arrangement for a rail vehicle, a brake disc rotating with an axle is to be brakingly engaged by a brake pad, normally at each axial side of the disc. The replaceable brake pad is attached to a brake pad holder, which is suspended from a member of the vehicle undercarriage or bogie and is normally a part of a disc brake caliper, comprising a brake actuator for supplying a brake force to the brake pad holder substantially transverse to the brake disc.
The present invention relates to a force measuring device in connection with the brake pad holder for supplying measurement data regarding forces occurring at brake application of the brake pads against the brake disc.
Depicted in Fig 1 is a conventional brake pad holder 1. The brake pad holder has a planar upper surface, against which a planar portion of the lower surface of a brake pad 2 is to bear. For the releasable attachment of the brake pad 2, this planar upper surface has a longitudinal dovetail groove for cooperation with a corresponding longitudinal ridge arrangement on the lower surface of the brake pad 2. The cooperating groove and ridge arrangement may be defined as attachment means.
The dovetail groove of the brake pad holder 1 is open at the short end to the right in the drawing or the lower end in mounted condition. The brake pad holder 1 is here provided with fastening means 3 for a closure device (not shown) for the dovetail groove, so that the brake pad 2 is held in position after mounting.
The brake pad holder 1 is also provided with a suspension bore 4 for pivotal suspension of the brake pad holder, as is well known to any person skilled in the art. The bore 4 shall be parallel with the brake disc.
When it is desired to measure forces occurring at brake application, an insert 5 is mounted between the brake pad holder 1 and the brake pad 2. For this purpose, the insert 5 is provided on its upper side with a dovetail groove 6 corresponding to the dovetail groove in the brake pad holder 1 and on its lower side with a longitudinal ridge arrangement (Fig 4) corresponding to the ridge arrangement of the brake pad 2 and comprising two longitudinal ridges 7 and an intermediate, somewhat lower portion. In this way the insert 5 may be mounted between the brake pad holder 1 and the brake pad 2, as is shown in Fig 1. The latter may be held in position in the insert 5 by removable end closures 8 attached to the ends of the insert 5, preferably by screws. (The left end closure 8 in Fig 2 is removed for clearly showing the dovetail shape of the groove 6. )
Tongues 9 are machined out of the insert 5 at the dovetail groove 6 and over the ridges 7 at its lower side, for example to shapes shown in the Figures. These tongues 9 may for example be four at each side of a center line of the insert and may be symmetrically arranged. The tongues 9 may elastically yield to a certain extent under forces acting thereon. The central portion of each tongue 9 has a substantially square cross-section and can accordingly yield in two directions: in the longitudinal direction of the insert 5 and perpendicular thereto, i e normal to the insert. These two directions correspond to yield under friction forces and application forces, respectively, at brake application by means of the brake pad attached to the insert 5 on the brake pad holder 1.
The yield and thus the forces may be measured by strain gauges 10 attached to the central portion of each tongue 9, preferably at all four sides of the square. The tongues 9 and the strain gauges 10 may together be defined as force measuring means .
In the shown example there are 16 strain gauges in a bridge for measuring friction force and application force or brake force, respectively. The dovetail groove 6 may be provided with a central longitudinal channel 11 for connecting wires from the strain gauges 10. Wires may leave the insert 5 through bores 12 leading to the channel 11. A cover 13 may be arranged over each pair of tongues 9. Thermo elements 14 may be arranged at the side of the insert 5 for assessing the temperature attained at braking.
The force measuring means have been shown and described as strain gauges, but other technical solutions are feasible for the person skilled in the art. With the use of strain gauges or similar means the thickness of the insert 5 can be so small that an ordinary brake pad 2 can be used. If not, a brake pad with reduced thickness may be used for the measurement.

Claims

1. A force measuring device for measuring forces at disc braking of a rail vehicle by means of a brake pad (2) attached to a brake pad holder (1) and brakingly engaging a rotating brake disc, c h a r a c t e r i z e d in that an insert (5), which contains force measuring means (9, 10), is to be arranged between the brake pad holder (1) and the brake pad (2) and has similar attachment means (6, 7) as the brake pad holder and the brake pad.
2. A device according to claim 1, wherein the insert
(5) is provided on its upper side with a dovetail groove
(6) for cooperation with a corresponding longitudinal ridge arrangement on the lower side of the brake pad (2) and on its lower side with a longitudinal ridge arrangement (7) for cooperation with a dovetail groove on the upper side of the brake pad holder (1) .
3. A device according to claim 1, wherein the insert
(5) is provided with end closures (8) for keeping the brake pad (2) in proper position in the insert.
4. A device according to claim 1, wherein the force measuring means (9, 10) comprise elastically yieldable tongues (9) machined out of the insert (5) and strain gauges (10) attached to the tongues.
PCT/SE2008/050081 2007-01-26 2008-01-24 A force measuring device WO2008091217A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0700181A SE530800C2 (en) 2007-01-26 2007-01-26 Power measuring device for disc braking of rail vehicles
SE0700181-1 2007-01-26

Publications (1)

Publication Number Publication Date
WO2008091217A1 true WO2008091217A1 (en) 2008-07-31

Family

ID=39644722

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2008/050081 WO2008091217A1 (en) 2007-01-26 2008-01-24 A force measuring device

Country Status (2)

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SE (1) SE530800C2 (en)
WO (1) WO2008091217A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012078266A (en) * 2010-10-05 2012-04-19 Akebono Brake Ind Co Ltd Dragging torque measuring apparatus of disc brake, and pad equipped with the same
WO2019025723A1 (en) * 2017-08-01 2019-02-07 Tallano Technologie Friction assembly for a railway braking system
WO2019025722A1 (en) * 2017-08-01 2019-02-07 Tallano Technologie Friction assembly for a railway braking system
US20220299082A1 (en) * 2019-06-13 2022-09-22 Brembo S.P.A. Method and system for detecting and measuring a braking force of a braking system for vehicle, by means of photonic sensors incorporated in a brake pad

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1016761A (en) * 1996-04-30 1998-01-20 Nippon Soken Inc Dragging torque measuring device of disk brake
WO2003035444A2 (en) * 2001-10-24 2003-05-01 Lucas Automotive Gmbh Disk brake

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1016761A (en) * 1996-04-30 1998-01-20 Nippon Soken Inc Dragging torque measuring device of disk brake
WO2003035444A2 (en) * 2001-10-24 2003-05-01 Lucas Automotive Gmbh Disk brake

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012078266A (en) * 2010-10-05 2012-04-19 Akebono Brake Ind Co Ltd Dragging torque measuring apparatus of disc brake, and pad equipped with the same
WO2019025723A1 (en) * 2017-08-01 2019-02-07 Tallano Technologie Friction assembly for a railway braking system
WO2019025722A1 (en) * 2017-08-01 2019-02-07 Tallano Technologie Friction assembly for a railway braking system
FR3069832A1 (en) * 2017-08-01 2019-02-08 Tallano Technologie FRICTION ASSEMBLY FOR RAIL BRAKING SYSTEM
FR3069831A1 (en) * 2017-08-01 2019-02-08 Tallano Technologie FRICTION ASSEMBLY FOR RAIL BRAKING SYSTEM
US11359685B2 (en) 2017-08-01 2022-06-14 Tallano Technologie Friction set for railway braking system
US11371571B2 (en) 2017-08-01 2022-06-28 Tallano Technologie Friction set for railway braking system
US20220299082A1 (en) * 2019-06-13 2022-09-22 Brembo S.P.A. Method and system for detecting and measuring a braking force of a braking system for vehicle, by means of photonic sensors incorporated in a brake pad

Also Published As

Publication number Publication date
SE530800C2 (en) 2008-09-16
SE0700181L (en) 2008-07-27

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