CA2123010A1 - Vehicle steering wheel - Google Patents
Vehicle steering wheelInfo
- Publication number
- CA2123010A1 CA2123010A1 CA002123010A CA2123010A CA2123010A1 CA 2123010 A1 CA2123010 A1 CA 2123010A1 CA 002123010 A CA002123010 A CA 002123010A CA 2123010 A CA2123010 A CA 2123010A CA 2123010 A1 CA2123010 A1 CA 2123010A1
- Authority
- CA
- Canada
- Prior art keywords
- steering wheel
- layer
- sheet
- switch
- momentary
- 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.)
- Abandoned
Links
- 229920000642 polymer Polymers 0.000 claims abstract description 9
- 229920005830 Polyurethane Foam Polymers 0.000 claims abstract description 7
- 239000011496 polyurethane foam Substances 0.000 claims abstract description 7
- 239000004065 semiconductor Substances 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 229920001169 thermoplastic Polymers 0.000 claims description 2
- 239000004416 thermosoftening plastic Substances 0.000 claims description 2
- 239000011888 foil Substances 0.000 abstract 3
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/0076—Switches therefor
- B60Q1/0082—Switches therefor mounted on the steering wheel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
- B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
- B62D1/04—Hand wheels
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/9625—Touch switches using a force resistance transducer
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K2017/9602—Touch switches characterised by the type or shape of the sensing electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Steering Controls (AREA)
- Push-Button Switches (AREA)
Abstract
The invention concerns a vehicle steering wheel (1) covered with a layer of polyurethane foam with a higher-density skin.
Integrated in the part of the layer facing the driver, in the region of the spokes (2) and/or the dished boss (4), is at least one touch pad (5) connected to the electromechanical slip ring. In order to ensure reliable operation, the touch pad (5) comprises a contact plate (10) located on the side nearest the steering wheel, a semiconducting-polymer foil (8) lying directly over the contact plate and a conductor-track foil (9) lying directly over the semiconducting-polymer foil on the side facing the driver.
Integrated in the part of the layer facing the driver, in the region of the spokes (2) and/or the dished boss (4), is at least one touch pad (5) connected to the electromechanical slip ring. In order to ensure reliable operation, the touch pad (5) comprises a contact plate (10) located on the side nearest the steering wheel, a semiconducting-polymer foil (8) lying directly over the contact plate and a conductor-track foil (9) lying directly over the semiconducting-polymer foil on the side facing the driver.
Description
~1~3010 Re: International Applica~ion PCT/EP 92/02642 English Translation of a ~ Description Accompanying the Paper ~a~d J~lt~uary 979 1994 This invention relates to a steering wheel for motor vehicles9 in which the rim and spokes of'the steer-ing wheel and ~he means for impact protection provided in the steering wheel oYer i~s hub are covered with a layer of polyure~hane foam having an integral skin or of a syn-~hetic thermoplastic, such as PVC or PP, and at least one momentary con~act switch tha~ is connected to an electrical and mechanical rotary transformer is inteyrated in that portion of the layer which faces the passenger compartment alld is disposed adjacent to the spokes and/or the means ~or impact protection~
By its appearance and its handle, such a: steer-ing wheel is desired to emphasize the special character of the type o~ vehicle and the steering wheel m~ provide ~or ~he driver the desired comfort and is often required also to raise his or her pre~ige. The com~or~ can be increased in ~hat various con~rol func~ions are incorporated in the steering wheel~ But momentary contact switches which are in-corporated in the layer of polyurethane foam or plastic and are distinctly visible will adversely affect the appearance:
and the handle of the s~eering wheel.
r 2.1~ 3 i~
In order to improve the appearance, the steer~
ing wheel which is described in DE-B-1,948,615 and is provided with a deformable body for impact protection ls provided on tha~ side of the deformable body which faces away from the passenger compartment with one of the two contacts of the switch for the horn, the other o~f~Said con~acts and two springs are mounted on ~he steering wheel itself and one o~ said springs opposes an approach and the other opposes a departure of the deformable body to and from the steering wheel so that the deformable body is resiliently held to maintain a contact clearance. In that case the deformable body is used as a circuit-closing member of the electric switch and conceals the components of said switch.
From DE~A-3,~36,2~7 it is known in a steering wheel that is sheathed with a layer of polyurethane foam a platelike circuit-closing member, which coopera~es with the spoke or hub of the steering wheel and consists of a metal-plastic composite that is embedded in the layer of polyurethane ~oam. The metal layer is connected by a cable to the slip ring of the switch and an elastic foam layer, :
which has an aperture adJacent to the contacts and is arranged to maintain a contact clearance, is provided be-tween the metal layer of the metal-plastic composite sheet and the other contact provided on the spoke or hub o~ the steering wheelO That arrangement has the disadvantage that the repeated actuation o~ the circuit-closing member will result in a considerable wear in the course of time so that the ~unctional reliability of the circuit-closing member f ~ ~ ! wl I1 aldversely be affected~ Besides, the circuit closing member cannot reliably be held in its OFF position as the layer of polyurethane foam is formed around said member because the pressure and/or the temperature employed during that operatlon may e~fect a change of that position. A
~ 3 similar design is embodied in the membrane switch which is described in DE-A-3 506 332 and is used with steering wheels of motor vehicles and comprises at least two film electrodes~ between which a layer is disposed as a spacer which consists of a rubber which is rendered electrically conductive by an application of pressure. ~ ~
, __ This object is accomplished by ~he features of the claim~
The semiconductor polymer sheet constitutes an insulator between the con~act shee~, which is mounted on the skeleton of the steering wheel, and the sheet provided with the printed conductors and will be conductive only when pressure is applied ~o the momen~ary contact switch ~rom the outside, e.g., by the fingers. The higher the pressure which is applied, the higher will be the conduc-tlvity of the semiconductor polymer sheet. That effect is selected to match the forces exerted in momentary contact switches and can be reproduced with~n said llmits. The currents flowing through the momentary contact switch are of an order of microamperes, as a rule. In the dependence on the pressure applied -the internal resistance of the momentary contact switch is decreased from more than 5 megohms to 1 kiloohm~
Because the active contact and switching sheets of the momentary contact switch are always in direct con-tact with each other there is no need for spacers and the sheets of the momentary contact switch may have any de-siredlconfiguration without a rlsk of drop-outs at the in-terfaces. Jhe momentary contact switches have a relatively long li~e because they do not comprise movable parts. Be-sides9 the momentary contact switches have a response time of 1 to 2 milliseconds and for this reason are insen-sitive to loud noise and to vibrations at audible fre-quencies or harmonics thereof~
~ ~ 2123~10 T~le ~omentary contact swi~ch is connected to an electronic comparator, by which the changes of ~he re-sistance of the momentary contact switch are eliminated which are due to the pressures ~nd temperatures employed during the coating operation in which the momentary contact switch has been incorporated in the polyurethane~ f-oam la-yer or plastic layer.
The document: Electro Conference Record lG
(1991~, April 16-18, New York, pages 666-668, shows a mo-mentary cvntact switch which consists of a semiconductor polymer sheet and a momentary contact switch, which lies directly on that sheet and the resistance of which decrea-ses as the pressure is increased. That momentary contact switch can be used for machine control systems, input de-vices and touch control syste~s but a use in steering wheels has not been contemplated because such a momentary cantact switch cannot be used to control ~he horn.
The invention will now be explained more in de-tail and by way of example with reference to a drawing.
Figure 1 is a top plan view showing a steering wheel 1~ in which ~he four spokes 2 and the rim 3 of the steering wheel and the means 4 for impact protection, which are attached over the hub o~ the steering wheel and are ~irmly connected to the steering wheel 1, are coated with a layer of polyurethane foam having an integral skin.
The audible signal is generated by four separate momentary contact switches 4, which are èmbedded in the polyurethane foam liayer o~ the means 4 for impact protection.
According to Figure 2 the momentary contact switch 5 is connected to the circuit 6 o~ the motor vehicle, not shown. The current flows through the amplifier 7 to the horn9 not shown.
"` 2123010 The basic design of the momentary contact switch i5 shown in Figure 3. That switch comprises the se-miconductor polymer sheet 8, which constitutes an insu-lator between the contact sheet 10, which is directly moun-ted on the steering wheel l, and the sheet 9 that is pro-Yided wi~h prin~ed conductors and lies directl~oh the -:
polymer sheet 8 and faces the passenger compartment.
. I
.
By its appearance and its handle, such a: steer-ing wheel is desired to emphasize the special character of the type o~ vehicle and the steering wheel m~ provide ~or ~he driver the desired comfort and is often required also to raise his or her pre~ige. The com~or~ can be increased in ~hat various con~rol func~ions are incorporated in the steering wheel~ But momentary contact switches which are in-corporated in the layer of polyurethane foam or plastic and are distinctly visible will adversely affect the appearance:
and the handle of the s~eering wheel.
r 2.1~ 3 i~
In order to improve the appearance, the steer~
ing wheel which is described in DE-B-1,948,615 and is provided with a deformable body for impact protection ls provided on tha~ side of the deformable body which faces away from the passenger compartment with one of the two contacts of the switch for the horn, the other o~f~Said con~acts and two springs are mounted on ~he steering wheel itself and one o~ said springs opposes an approach and the other opposes a departure of the deformable body to and from the steering wheel so that the deformable body is resiliently held to maintain a contact clearance. In that case the deformable body is used as a circuit-closing member of the electric switch and conceals the components of said switch.
From DE~A-3,~36,2~7 it is known in a steering wheel that is sheathed with a layer of polyurethane foam a platelike circuit-closing member, which coopera~es with the spoke or hub of the steering wheel and consists of a metal-plastic composite that is embedded in the layer of polyurethane ~oam. The metal layer is connected by a cable to the slip ring of the switch and an elastic foam layer, :
which has an aperture adJacent to the contacts and is arranged to maintain a contact clearance, is provided be-tween the metal layer of the metal-plastic composite sheet and the other contact provided on the spoke or hub o~ the steering wheelO That arrangement has the disadvantage that the repeated actuation o~ the circuit-closing member will result in a considerable wear in the course of time so that the ~unctional reliability of the circuit-closing member f ~ ~ ! wl I1 aldversely be affected~ Besides, the circuit closing member cannot reliably be held in its OFF position as the layer of polyurethane foam is formed around said member because the pressure and/or the temperature employed during that operatlon may e~fect a change of that position. A
~ 3 similar design is embodied in the membrane switch which is described in DE-A-3 506 332 and is used with steering wheels of motor vehicles and comprises at least two film electrodes~ between which a layer is disposed as a spacer which consists of a rubber which is rendered electrically conductive by an application of pressure. ~ ~
, __ This object is accomplished by ~he features of the claim~
The semiconductor polymer sheet constitutes an insulator between the con~act shee~, which is mounted on the skeleton of the steering wheel, and the sheet provided with the printed conductors and will be conductive only when pressure is applied ~o the momen~ary contact switch ~rom the outside, e.g., by the fingers. The higher the pressure which is applied, the higher will be the conduc-tlvity of the semiconductor polymer sheet. That effect is selected to match the forces exerted in momentary contact switches and can be reproduced with~n said llmits. The currents flowing through the momentary contact switch are of an order of microamperes, as a rule. In the dependence on the pressure applied -the internal resistance of the momentary contact switch is decreased from more than 5 megohms to 1 kiloohm~
Because the active contact and switching sheets of the momentary contact switch are always in direct con-tact with each other there is no need for spacers and the sheets of the momentary contact switch may have any de-siredlconfiguration without a rlsk of drop-outs at the in-terfaces. Jhe momentary contact switches have a relatively long li~e because they do not comprise movable parts. Be-sides9 the momentary contact switches have a response time of 1 to 2 milliseconds and for this reason are insen-sitive to loud noise and to vibrations at audible fre-quencies or harmonics thereof~
~ ~ 2123~10 T~le ~omentary contact swi~ch is connected to an electronic comparator, by which the changes of ~he re-sistance of the momentary contact switch are eliminated which are due to the pressures ~nd temperatures employed during the coating operation in which the momentary contact switch has been incorporated in the polyurethane~ f-oam la-yer or plastic layer.
The document: Electro Conference Record lG
(1991~, April 16-18, New York, pages 666-668, shows a mo-mentary cvntact switch which consists of a semiconductor polymer sheet and a momentary contact switch, which lies directly on that sheet and the resistance of which decrea-ses as the pressure is increased. That momentary contact switch can be used for machine control systems, input de-vices and touch control syste~s but a use in steering wheels has not been contemplated because such a momentary cantact switch cannot be used to control ~he horn.
The invention will now be explained more in de-tail and by way of example with reference to a drawing.
Figure 1 is a top plan view showing a steering wheel 1~ in which ~he four spokes 2 and the rim 3 of the steering wheel and the means 4 for impact protection, which are attached over the hub o~ the steering wheel and are ~irmly connected to the steering wheel 1, are coated with a layer of polyurethane foam having an integral skin.
The audible signal is generated by four separate momentary contact switches 4, which are èmbedded in the polyurethane foam liayer o~ the means 4 for impact protection.
According to Figure 2 the momentary contact switch 5 is connected to the circuit 6 o~ the motor vehicle, not shown. The current flows through the amplifier 7 to the horn9 not shown.
"` 2123010 The basic design of the momentary contact switch i5 shown in Figure 3. That switch comprises the se-miconductor polymer sheet 8, which constitutes an insu-lator between the contact sheet 10, which is directly moun-ted on the steering wheel l, and the sheet 9 that is pro-Yided wi~h prin~ed conductors and lies directl~oh the -:
polymer sheet 8 and faces the passenger compartment.
. I
.
Claims
CLAIM
A steering wheel for motor vehicles, in which the rim (3) and spokes (2) of the steering wheel and the means for impact protection (4) provided in the steering wheel over its hub are covered with a layer of polyurethane foam having an integral skin or of a synthetic thermo-plastic, such as PVC or PP, and at least one momentary con-tact switch (5) that is connected to an electrical and me-chanical rotary transformer is integrated in that portion of the layer which faces the passenger compartment and is disposed adjacent to the spokes and/or the means for impact protection, characterized in that the momentary contact switch (5) consists of a contact sheet (10), which faces the steering wheel, a semiconductor polymer sheet (8) directly contacting said contact sheet, and a sheet (9) provided with printed conductors and contacting said polymer sheet and facing the passenger compartment, and is connected to an electronic comparator.
A steering wheel for motor vehicles, in which the rim (3) and spokes (2) of the steering wheel and the means for impact protection (4) provided in the steering wheel over its hub are covered with a layer of polyurethane foam having an integral skin or of a synthetic thermo-plastic, such as PVC or PP, and at least one momentary con-tact switch (5) that is connected to an electrical and me-chanical rotary transformer is integrated in that portion of the layer which faces the passenger compartment and is disposed adjacent to the spokes and/or the means for impact protection, characterized in that the momentary contact switch (5) consists of a contact sheet (10), which faces the steering wheel, a semiconductor polymer sheet (8) directly contacting said contact sheet, and a sheet (9) provided with printed conductors and contacting said polymer sheet and facing the passenger compartment, and is connected to an electronic comparator.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4137975.6 | 1991-11-19 | ||
| DE4137975A DE4137975A1 (en) | 1991-11-19 | 1991-11-19 | STEERING WHEEL FOR MOTOR VEHICLES |
| PCT/EP1992/002642 WO1993009976A1 (en) | 1991-11-19 | 1992-11-17 | Vehicle steering wheel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2123010A1 true CA2123010A1 (en) | 1993-05-27 |
Family
ID=6445098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002123010A Abandoned CA2123010A1 (en) | 1991-11-19 | 1992-11-17 | Vehicle steering wheel |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0612292B1 (en) |
| JP (1) | JP3153240B2 (en) |
| KR (1) | KR940703759A (en) |
| BR (1) | BR9206773A (en) |
| CA (1) | CA2123010A1 (en) |
| CZ (1) | CZ121494A3 (en) |
| DE (2) | DE4137975A1 (en) |
| ES (1) | ES2103979T3 (en) |
| MX (1) | MX9206601A (en) |
| PT (1) | PT101074A (en) |
| WO (1) | WO1993009976A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995010441A1 (en) * | 1993-10-13 | 1995-04-20 | Allhoff Cramer Adalbert | Vehicle steering wheel |
| DE4436291C1 (en) * | 1994-10-11 | 1995-09-28 | Opel Adam Ag | Automobile steering wheel with incorporated switch contacts |
| DE102004013821A1 (en) * | 2004-03-20 | 2005-10-06 | Volkswagen Ag | Foil keypad for use in an automobile has an electroluminescent foil with a pressure sensitive foil |
| DE102005037685B4 (en) * | 2005-08-10 | 2021-06-10 | Bayerische Motoren Werke Aktiengesellschaft | Storage compartment in a vehicle |
| DE102010026291A1 (en) | 2009-08-06 | 2011-02-10 | Volkswagen Ag | motor vehicle |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4228115A (en) * | 1979-03-22 | 1980-10-14 | General Motors Corporation | Method of making a horn pad |
| DE3236257A1 (en) * | 1982-09-30 | 1984-04-05 | Karl Schmidt Gmbh, 7107 Neckarsulm | SAFETY STEERING WHEEL |
| US4453088A (en) * | 1982-12-10 | 1984-06-05 | General Motors Corporation | Multiplex system for steering wheel mounted switches |
| JPS59230849A (en) * | 1983-06-14 | 1984-12-25 | Toyoda Gosei Co Ltd | Impact energy absorbing structure for steering wheel |
| JPS60136241U (en) * | 1984-02-22 | 1985-09-10 | 豊田合成株式会社 | steering wheel |
| JPS6144034A (en) * | 1984-08-07 | 1986-03-03 | Omron Tateisi Electronics Co | Switch control device in vehicle |
-
1991
- 1991-11-19 DE DE4137975A patent/DE4137975A1/en not_active Withdrawn
-
1992
- 1992-11-17 CA CA002123010A patent/CA2123010A1/en not_active Abandoned
- 1992-11-17 ES ES92923733T patent/ES2103979T3/en not_active Expired - Lifetime
- 1992-11-17 MX MX9206601A patent/MX9206601A/en not_active IP Right Cessation
- 1992-11-17 EP EP92923733A patent/EP0612292B1/en not_active Expired - Lifetime
- 1992-11-17 CZ CZ941214A patent/CZ121494A3/en unknown
- 1992-11-17 JP JP50899093A patent/JP3153240B2/en not_active Expired - Fee Related
- 1992-11-17 WO PCT/EP1992/002642 patent/WO1993009976A1/en active IP Right Grant
- 1992-11-17 DE DE59208615T patent/DE59208615D1/en not_active Expired - Fee Related
- 1992-11-17 BR BR9206773A patent/BR9206773A/en not_active IP Right Cessation
- 1992-11-17 KR KR1019940701658A patent/KR940703759A/en not_active Application Discontinuation
- 1992-11-18 PT PT101074A patent/PT101074A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| DE4137975A1 (en) | 1993-05-27 |
| CZ121494A3 (en) | 1994-10-19 |
| JPH07501024A (en) | 1995-02-02 |
| MX9206601A (en) | 1993-06-01 |
| ES2103979T3 (en) | 1997-10-01 |
| KR940703759A (en) | 1994-12-12 |
| DE59208615D1 (en) | 1997-07-17 |
| PT101074A (en) | 1994-05-31 |
| WO1993009976A1 (en) | 1993-05-27 |
| JP3153240B2 (en) | 2001-04-03 |
| EP0612292A1 (en) | 1994-08-31 |
| BR9206773A (en) | 1994-12-20 |
| EP0612292B1 (en) | 1997-06-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |