CA2022361A1 - Skeleton structure for steering wheels for motor vehicles - Google Patents
Skeleton structure for steering wheels for motor vehiclesInfo
- Publication number
- CA2022361A1 CA2022361A1 CA 2022361 CA2022361A CA2022361A1 CA 2022361 A1 CA2022361 A1 CA 2022361A1 CA 2022361 CA2022361 CA 2022361 CA 2022361 A CA2022361 A CA 2022361A CA 2022361 A1 CA2022361 A1 CA 2022361A1
- Authority
- CA
- Canada
- Prior art keywords
- steering wheel
- rim
- fluid medium
- skeleton structure
- steering
- 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
Classifications
-
- 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
- B62D1/06—Rims, e.g. with heating means; Rim covers
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D7/00—Steering linkage; Stub axles or their mountings
- B62D7/22—Arrangements for reducing or eliminating reaction, e.g. vibration, from parts, e.g. wheels, of the steering system
- B62D7/222—Arrangements for reducing or eliminating reaction, e.g. vibration, from parts, e.g. wheels, of the steering system acting on the steering wheel
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Controls (AREA)
- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
- Tires In General (AREA)
Abstract
ABSTRACT
In order to reduce the mass moment of inertia the tubular rim of a skeleton structure for steering wheels for motor vehicles is partly filled with a fluid medium.
In order to reduce the mass moment of inertia the tubular rim of a skeleton structure for steering wheels for motor vehicles is partly filled with a fluid medium.
Description
~02~36~
DESCRIPTIO~
~ his invention relates to a skeleton structure for steering wheels for motor vehicles, con-sisting of a steering wheel hub, a tubular steering wheel rim, and steering wheel s~okes, which connect said hub and rim.
Owing to the-relativel~ high active drivi~g safety and the ride comfort of modern motor vehi¢les, they afford 3uch an ov~rall comfort that even very slight disturbances of the vibration level will be regarded as an inconvenien¢e by the driver of the motor vehicle. A significant inconveniencs i8 constituted by the wheelfight, which describes a vibrational state Or the eDtire axle system of the motor vehicle, particularlg of ~the spring suspension of the front axle inclusive of the :
~: steering system. ~hat vibration will be noticed by the driver of the motor vehicle as a rotational vibration ~ ' , ,:
.
, : :: :
2Q22~
(wo~ g) a~d a vertical vibratio~ (shaking, tremDl-i~g) of the steering INheel during a travel at a speed in the ra~ge from about 80 to 130 km/h. A jumping of the wheels resu~ti~lg from static un~alance a.~d the wo~oling motion whic~ is due to dynamic unDalance as well as the rotatio~al vi~ration of the steering ~heel which is caused by fluttering due to a-p~rameter-excited vibr~tion owing to variable spring a~d da~ping characteristics of the tires in the transverse direction may ~e oppo~ed by the use of a steerirlg wheel w~ich has a large moment of inertia or flywheel mass.
The unDalance of the wheels on the rear axle gives rise to a horizontal vibration of the body of the ve~icle and, as a result, to a vertical vi-~ratio~ of the steering wheel. A steering wheel having a small ma~s is desiraole for eliminating the resulting shaki~g of tke steering Nheel.
An overshooting of the steering ~heel will ofte~ occur ~hen a motor vehi~le having a front wheel or all-wheel drive has tqken a corner a~d the steering wheel is then allo~ed to return while the ve-h~icle is accelerated with the largest possiDle driving force. ~he vibration of the vehicle which then occurs around tne roll axis and the vertical axis (roll and yaw) ca~ ~e influenced lrl a sense to stabilize the vehicle by the use o~ a steering wheel having a small , ~..
.
.
DESCRIPTIO~
~ his invention relates to a skeleton structure for steering wheels for motor vehicles, con-sisting of a steering wheel hub, a tubular steering wheel rim, and steering wheel s~okes, which connect said hub and rim.
Owing to the-relativel~ high active drivi~g safety and the ride comfort of modern motor vehi¢les, they afford 3uch an ov~rall comfort that even very slight disturbances of the vibration level will be regarded as an inconvenien¢e by the driver of the motor vehicle. A significant inconveniencs i8 constituted by the wheelfight, which describes a vibrational state Or the eDtire axle system of the motor vehicle, particularlg of ~the spring suspension of the front axle inclusive of the :
~: steering system. ~hat vibration will be noticed by the driver of the motor vehicle as a rotational vibration ~ ' , ,:
.
, : :: :
2Q22~
(wo~ g) a~d a vertical vibratio~ (shaking, tremDl-i~g) of the steering INheel during a travel at a speed in the ra~ge from about 80 to 130 km/h. A jumping of the wheels resu~ti~lg from static un~alance a.~d the wo~oling motion whic~ is due to dynamic unDalance as well as the rotatio~al vi~ration of the steering ~heel which is caused by fluttering due to a-p~rameter-excited vibr~tion owing to variable spring a~d da~ping characteristics of the tires in the transverse direction may ~e oppo~ed by the use of a steerirlg wheel w~ich has a large moment of inertia or flywheel mass.
The unDalance of the wheels on the rear axle gives rise to a horizontal vibration of the body of the ve~icle and, as a result, to a vertical vi-~ratio~ of the steering wheel. A steering wheel having a small ma~s is desiraole for eliminating the resulting shaki~g of tke steering Nheel.
An overshooting of the steering ~heel will ofte~ occur ~hen a motor vehi~le having a front wheel or all-wheel drive has tqken a corner a~d the steering wheel is then allo~ed to return while the ve-h~icle is accelerated with the largest possiDle driving force. ~he vibration of the vehicle which then occurs around tne roll axis and the vertical axis (roll and yaw) ca~ ~e influenced lrl a sense to stabilize the vehicle by the use o~ a steering wheel having a small , ~..
.
.
2~2~3~
moment of il~ertia, i.e., ~ small fl~heel mass. The parameter in~luences affecting the overshooting of the steering wheel caD be evaluated in depende.ice o~ the frequency a~d the decay rate as a fu~ction of the moment of inertia of the steering wheel. A decre~se of the mome~t of i~ertia of the steering wheel will strong-ly staDilize the vehicle. The requireme~ts whi~h snould ~e met ~y the steering ~heel for an optimum ride com-fort and handling of a motor vehicle ca~ be summarized as callillg for a steering wheel having the followi~g features:
- Light weight, and a concentration of the mass as close as possiDle to the axis of rotation ~shaking, tremblin6);
- A moment of inertia or flywheel mass which co~stitutes a compromise ~etween the req~rements to miuimize the rotational vivration of the steering wheel and to preve~t a~ overshooting, which compromise should specificall~ oe selected for vehi~les of each type.
The calculatio~ of the moment of inertia will lndicate that for a steering wheel having giveu dimensions and ~ given diameter the moment of inertia can be influenced only by a decrease of the mass which can be associated with the radius of the steering wheel.
For instauce, EP-A-0 29Z 0~8 describes for steering wheels of motor vehi~les a skeleton structure i~ which the hu~ a~d spo~es of the steering wheel and the portions 20223~
of the spokes in wni~h the rim of 'he steerlng -~heel is embedded are constituted vy an integral die casting of alumi~lum a~d i~ dependence on the ~esired moment of inertia the rim of the steerlng wheel is solid or tubu-l~r alld is made of steel or aluminum or an alumi~um alloy. DE-A-3 625 372 discloses a steering wheel i~
whi~h the huD and spokes are made of synthetic thermo-plastics a~d said huu and spokes as well ~s the rim of the steering wheel are covered by a layer of a deform-able plastic. In dependence on the desired mass moment of inertia the rim of the steering wheel may be made of steel, light metal or wound endless filaments embedded in plastic. In a steering wheel having given dimensions~
a variation of the moment o~ inertia ln conjunctio~
with a minimum mass of the steering wheel ca~ be selected for vehicles of a given type b~J a selection of the de-sign of the rim of the steering wheel in con~unction with a give~ hub geometry a~d witn a spoke geometry selected for a~ optimum weight.
In a steering wheel having a n ~ predetermined style, e.g., in 3 single-spoke steering whéel or in a steering wheel having two spokes 3rranged , ke an arrowhead in the lower portion of the steering wheel, the above measures will be restricted by the strength limits of the overall s~ste~ because a steering " :
- : - ~ . , ~ , ~
202~3~
wheel must have a~l adequate strength under the action of restraining forces iu the direction of travel of the vehi~le. A force of 380 N acting in the direction of st;raight-ahead travel o~ the larger arc must slot ef-fect a permanent deformatio~ of tne steering wheel oy more than 105 mm.
It is a,. ooject of the i~vention to i~rease in the design of a steering wheel having given dime~lsio~s the limits wnich are imposed by the strength requirements and tG urther reduce the mass mome~t of inertia of such steering wheel whereas the relia~ility and safety of the steering wheel should not adversely be affected.
That object is accomplis~ed in that the tubular rim of the steeri~g wheel is filled iu part by a fluid medium.
The quantity of the fluid medium will vary iu depe~dence ou the de~lsity of the fluid me-dium contained in the rim of the steering wheel a~d pre-feraDlg amou~ts to 0~5 to 2,5 %, particularly 1.0 to 2.0 %, of tne weight of the steering wheel.
Suitable fluid media may particularly consist of oil-water emulsions and glycol-water emulsion~.
The accelerating forces acting on the rim of the steerin~ wheel during a return swing of the steering wheel are directly proportional to the mass of the fluid medium aDd the rim of the steeriug ~heel as well , '''' ' " , " . '' .
.
~ ~ :
- 202~
as the fluid medium will be subjected to the same i!li-tial accelerations. For this reason the product of forces will be a linear function of mass so that the return swing of the steering wheel will be damped and there wil; be no overshooti~g. An additional ~raking action is due to the friction between the fluid medium and the inside surf~ce of the rim of the steering wheel.
The measures described hereinbefore will oppose the overshooting of the steering wheel ~ecause there will always be two opposing components of force and the fluid medium will lag Dehind the motion of the rim of the steering wheel. As a result, t~e mass moment of inertia a~d the flywheel mass mag ~e reduced 3~ more tha~ l~h without a need to change the material or the dimension~ which change would adversely affect the stre~gth which will determine the stiffnes_ of the stee-ring wheel.
The invention will now De descriDed more in detail and by wa~ of example.
Figure l is a top plan view showing a steering wheel 1 comprising a skeleton .~h~h is covered oy a sheath 2 of poIyurethane foam. The skeleton com-prises spokes 5, which are arranged on the smaller arc n a configuration like an arrowhead and are connected to the huv 3 and the rim 4 of the steering wheel and clude a~l acute angle of 30. The steerin~ wheel 1 i9 :
: :, ;~;;; ' ` ~
::
~:
. , : ~
: : .
2~22~
shown in Figure 2 iLI a transverse sectio~al view take..
O~l line I~ igure 1 al~d ~veighs 1970.2 g and is 450 mm i~l diameter. The rim 4 of the steering wheel was ~illed with 27.5 g of a~ glycol-water mixture 6.
.
, ,. . . ~ . .
:.:
: . .
,:: : : : .
..
moment of il~ertia, i.e., ~ small fl~heel mass. The parameter in~luences affecting the overshooting of the steering wheel caD be evaluated in depende.ice o~ the frequency a~d the decay rate as a fu~ction of the moment of inertia of the steering wheel. A decre~se of the mome~t of i~ertia of the steering wheel will strong-ly staDilize the vehicle. The requireme~ts whi~h snould ~e met ~y the steering ~heel for an optimum ride com-fort and handling of a motor vehicle ca~ be summarized as callillg for a steering wheel having the followi~g features:
- Light weight, and a concentration of the mass as close as possiDle to the axis of rotation ~shaking, tremblin6);
- A moment of inertia or flywheel mass which co~stitutes a compromise ~etween the req~rements to miuimize the rotational vivration of the steering wheel and to preve~t a~ overshooting, which compromise should specificall~ oe selected for vehi~les of each type.
The calculatio~ of the moment of inertia will lndicate that for a steering wheel having giveu dimensions and ~ given diameter the moment of inertia can be influenced only by a decrease of the mass which can be associated with the radius of the steering wheel.
For instauce, EP-A-0 29Z 0~8 describes for steering wheels of motor vehi~les a skeleton structure i~ which the hu~ a~d spo~es of the steering wheel and the portions 20223~
of the spokes in wni~h the rim of 'he steerlng -~heel is embedded are constituted vy an integral die casting of alumi~lum a~d i~ dependence on the ~esired moment of inertia the rim of the steerlng wheel is solid or tubu-l~r alld is made of steel or aluminum or an alumi~um alloy. DE-A-3 625 372 discloses a steering wheel i~
whi~h the huD and spokes are made of synthetic thermo-plastics a~d said huu and spokes as well ~s the rim of the steering wheel are covered by a layer of a deform-able plastic. In dependence on the desired mass moment of inertia the rim of the steering wheel may be made of steel, light metal or wound endless filaments embedded in plastic. In a steering wheel having given dimensions~
a variation of the moment o~ inertia ln conjunctio~
with a minimum mass of the steering wheel ca~ be selected for vehicles of a given type b~J a selection of the de-sign of the rim of the steering wheel in con~unction with a give~ hub geometry a~d witn a spoke geometry selected for a~ optimum weight.
In a steering wheel having a n ~ predetermined style, e.g., in 3 single-spoke steering whéel or in a steering wheel having two spokes 3rranged , ke an arrowhead in the lower portion of the steering wheel, the above measures will be restricted by the strength limits of the overall s~ste~ because a steering " :
- : - ~ . , ~ , ~
202~3~
wheel must have a~l adequate strength under the action of restraining forces iu the direction of travel of the vehi~le. A force of 380 N acting in the direction of st;raight-ahead travel o~ the larger arc must slot ef-fect a permanent deformatio~ of tne steering wheel oy more than 105 mm.
It is a,. ooject of the i~vention to i~rease in the design of a steering wheel having given dime~lsio~s the limits wnich are imposed by the strength requirements and tG urther reduce the mass mome~t of inertia of such steering wheel whereas the relia~ility and safety of the steering wheel should not adversely be affected.
That object is accomplis~ed in that the tubular rim of the steeri~g wheel is filled iu part by a fluid medium.
The quantity of the fluid medium will vary iu depe~dence ou the de~lsity of the fluid me-dium contained in the rim of the steering wheel a~d pre-feraDlg amou~ts to 0~5 to 2,5 %, particularly 1.0 to 2.0 %, of tne weight of the steering wheel.
Suitable fluid media may particularly consist of oil-water emulsions and glycol-water emulsion~.
The accelerating forces acting on the rim of the steerin~ wheel during a return swing of the steering wheel are directly proportional to the mass of the fluid medium aDd the rim of the steeriug ~heel as well , '''' ' " , " . '' .
.
~ ~ :
- 202~
as the fluid medium will be subjected to the same i!li-tial accelerations. For this reason the product of forces will be a linear function of mass so that the return swing of the steering wheel will be damped and there wil; be no overshooti~g. An additional ~raking action is due to the friction between the fluid medium and the inside surf~ce of the rim of the steering wheel.
The measures described hereinbefore will oppose the overshooting of the steering wheel ~ecause there will always be two opposing components of force and the fluid medium will lag Dehind the motion of the rim of the steering wheel. As a result, t~e mass moment of inertia a~d the flywheel mass mag ~e reduced 3~ more tha~ l~h without a need to change the material or the dimension~ which change would adversely affect the stre~gth which will determine the stiffnes_ of the stee-ring wheel.
The invention will now De descriDed more in detail and by wa~ of example.
Figure l is a top plan view showing a steering wheel 1 comprising a skeleton .~h~h is covered oy a sheath 2 of poIyurethane foam. The skeleton com-prises spokes 5, which are arranged on the smaller arc n a configuration like an arrowhead and are connected to the huv 3 and the rim 4 of the steering wheel and clude a~l acute angle of 30. The steerin~ wheel 1 i9 :
: :, ;~;;; ' ` ~
::
~:
. , : ~
: : .
2~22~
shown in Figure 2 iLI a transverse sectio~al view take..
O~l line I~ igure 1 al~d ~veighs 1970.2 g and is 450 mm i~l diameter. The rim 4 of the steering wheel was ~illed with 27.5 g of a~ glycol-water mixture 6.
.
, ,. . . ~ . .
:.:
: . .
,:: : : : .
..
Claims (8)
1. A skeleton structure for steering wheels for motor vehicles, consisting of a steering wheel hub, a tubular steering wheel rim, and steering wheel spokes, which connect said hub and rim, characterized in that the rim of the steering wheel is filled in part with a fluid medium.
2. A skeleton structure according to claim 1, characterized in that the quantity of the fluid medium amounts to 0.5 to 2.5% of the weight of the steering wheel.
3. A skeleton structure according to claim 1 or 2, characterized in that the fluid medium consists of a water-oil emulsion or of a glycol-water emulsion.
4. A skeleton structure according to claim 1, characterized in that the quantity of the fluid medium amounts to 1 to 2% of the weight of the steering wheel.
5. A steering wheel for motor vehicles which comprises a skeleton structure consisting of a steering wheel hub, a tubular steering wheel rim, and steering wheel spokes, which connect said hub and rim, the rim of the steering wheel being filled in part with a fluid medium.
6. A steering wheel according to claim 5, characterized in that the quantity of the fluid medium amounts to 0.5 to 2.5% of the weight of the steering wheel.
7. A steering wheel according to claim 5, characterized in that the quantity of the fluid medium amounts to 1 to 2% of the weight of the steering wheel.
8. A steering wheel according to claim 5 or 6, characterized in that the fluid medium consists of a water-oil emulsion or of a glycol-water emulsion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3927383.0 | 1989-08-19 | ||
| DE19893927383 DE3927383A1 (en) | 1989-08-19 | 1989-08-19 | SKELETON CONSTRUCTION FOR MOTOR VEHICLE STEERING WHEELS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2022361A1 true CA2022361A1 (en) | 1991-02-20 |
Family
ID=6387419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2022361 Abandoned CA2022361A1 (en) | 1989-08-19 | 1990-07-31 | Skeleton structure for steering wheels for motor vehicles |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0414300A1 (en) |
| JP (1) | JPH0396475A (en) |
| CA (1) | CA2022361A1 (en) |
| DE (1) | DE3927383A1 (en) |
| PT (1) | PT95022A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19756482C2 (en) * | 1997-12-18 | 2000-03-16 | Bayerische Motoren Werke Ag | steering wheel |
| DE29910991U1 (en) * | 1999-06-23 | 1999-11-04 | TRW Automotive Safety Systems GmbH & Co.KG, 63743 Aschaffenburg | Vehicle steering wheel |
| JP2002053047A (en) * | 2000-08-11 | 2002-02-19 | Nippon Plast Co Ltd | Steering wheel |
| DE20120221U1 (en) * | 2001-12-13 | 2002-04-18 | TRW Automotive Safety Systems GmbH & Co. KG, 63743 Aschaffenburg | Steering device for a motor vehicle |
| US20050155449A1 (en) * | 2004-01-21 | 2005-07-21 | Greg Birchmeier | Steering wheel damper |
| JP2008502521A (en) * | 2004-06-15 | 2008-01-31 | タカタ・ペトリ アーゲー | Vibration-controlled vehicle steering wheel |
| US20060278034A1 (en) * | 2005-06-13 | 2006-12-14 | Mark Daly | Fluidic steering wheel |
| DE102017220275A1 (en) | 2017-11-14 | 2019-05-16 | Volkswagen Aktiengesellschaft | Steering wheel and method of making a steering wheel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3625372A1 (en) * | 1986-07-26 | 1988-02-04 | Kolbenschmidt Ag | STEERING WHEEL |
| DE3717002A1 (en) * | 1987-05-21 | 1988-12-08 | Kolbenschmidt Ag | SKELETON CONSTRUCTION FOR MOTOR VEHICLE STEERING WHEELS |
| DE3827794A1 (en) * | 1987-08-31 | 1989-03-16 | Toyoda Gosei Kk | Steering wheel core |
-
1989
- 1989-08-19 DE DE19893927383 patent/DE3927383A1/en not_active Withdrawn
-
1990
- 1990-07-31 CA CA 2022361 patent/CA2022361A1/en not_active Abandoned
- 1990-08-04 EP EP90202127A patent/EP0414300A1/en not_active Withdrawn
- 1990-08-14 JP JP2214891A patent/JPH0396475A/en active Pending
- 1990-08-17 PT PT9502290A patent/PT95022A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| PT95022A (en) | 1992-04-30 |
| EP0414300A1 (en) | 1991-02-27 |
| JPH0396475A (en) | 1991-04-22 |
| DE3927383A1 (en) | 1991-02-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |