US20020066333A1 - Steering column for motor vehicle - Google Patents
Steering column for motor vehicle Download PDFInfo
- Publication number
- US20020066333A1 US20020066333A1 US09/730,228 US73022800A US2002066333A1 US 20020066333 A1 US20020066333 A1 US 20020066333A1 US 73022800 A US73022800 A US 73022800A US 2002066333 A1 US2002066333 A1 US 2002066333A1
- Authority
- US
- United States
- Prior art keywords
- end plate
- structural housing
- socket
- mast jacket
- longitudinal centerline
- 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.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0409—Electric motor acting on the steering column
Definitions
- This invention relates to a motor vehicle steering column having thereon an electric power assist apparatus.
- a typical motor vehicle steering column includes a tubular mast jacket supported on a body of the motor vehicle, a steering shaft supported on the mast jacket for rotation about a longitudinal centerline of the mast jacket, and a steering handwheel attached to the top of the steering shaft. Manual effort applied at the steering handwheel is transferred by the steering shaft to a steering gear of the motor vehicle connected to the bottom of the steering shaft.
- a “column mounted” electric power assist apparatus for supplementing the manual effort applied at the steering handwheel includes a housing rigidly attached to the bottom of the mast jacket, an electric motor supported on the housing, reduction gears in the housing for transferring the output torque of the electric motor to the steering shaft, a transducer in the housing for determining the magnitude and direction of the applied manual effort, and an electronic control for turning the electric motor on and off.
- a housing rigidly attached to the bottom of the mast jacket an electric motor supported on the housing
- reduction gears in the housing for transferring the output torque of the electric motor to the steering shaft
- a transducer in the housing for determining the magnitude and direction of the applied manual effort
- an electronic control for turning the electric motor on and off.
- This invention is a new and improved motor vehicle steering column having thereon a column mounted electric power assist apparatus including a tubular mast jacket, a structural housing of the assist apparatus, a socket in an end wall of the housing consisting of an annular seat in a plane perpendicular to a longitudinal centerline of the housing and a cylindrical guide wall around the annular seat machined concentric with the longitudinal centerline of the housing, and an annular end plate rigidly attached to the bottom of the mast jacket in a plane perpendicular to a longitudinal centerline thereof having a circular edge machined concentric with the longitudinal centerline of the mast jacket after the end plate is attached.
- the end plate plugs into the socket and bears flush against the seat with the circular edge of the end plate fitted closely in the cylindrical guide wall of the socket so that the longitudinal centerlines of the mast jacket and the housing are precisely aligned.
- a C-shaped retainer in an annular groove in the cylindrical guide wall overlaps the end plate to prevent dislodgment of the mast jacket from the housing.
- the retainer has a beveled shoulder which bears on an edge of the groove and converts resilient circumferential expansion of the retainer into longitudinal thrust on the end plate against the seat of the socket thereby to eliminate lash between the end plate and the housing in the direction of their longitudinal centerlines.
- FIG. 1 is a fragmentary exploded perspective view of a motor vehicle steering column according to this invention
- FIG. 2 is a broken-away view of a structural housing of an electric power assist apparatus of the motor vehicle steering column according to this invention.
- FIG. 3 is an enlarged view of the portion of FIG. 2 identified by the reference circle 3 in FIG. 2.
- a motor vehicle steering column 10 includes a column mounted electric power assist apparatus 12 , a mast jacket 14 , and a steering shaft 16 supported on the mast jacket for rotation about a longitudinal centerline 18 of the mast jacket.
- the mast jacket includes a tubular lower portion 20 and a tubular upper portion 22 supported on the lower portion for linear translation in the direction of the centerline 18 .
- a steering handwheel is rigidly attached to an upper end 24 of the steering shaft.
- the column mounted electric power assist apparatus 12 includes a structural housing 26 and an electric motor 28 rigidly attached to the housing at a mounting flange 30 , FIG. 2.
- the housing 26 includes a pair of integral external tubular mounting lugs 32 A, 32 B and an internal chamber 34 open through an end wall 36 of the housing in a plane perpendicular to a longitudinal centerline 38 of the housing.
- An annular seat 40 in a plane perpendicular to the centerline 38 of the housing and a cylindrical guide wall 42 machined to precise concentricity relative to the centerline 38 constitute a socket 44 on the housing in the end wall 36 .
- An annular end plate 46 is rigidly attached, preferably by fusion bonding, e.g. arc welding or spin welding, to the bottom of the mast jacket 14 at the exposed end of the tubular lower portion 20 of the mast jacket.
- the end plate includes an annular flat flange portion 48 in a plane perpendicular to the longitudinal centerline 18 of the mast jacket having an outer circular edge 50 .
- the outer circular edge 50 of the flange portion is machined to a diameter only slightly smaller than the diameter of the cylindrical guide wall 42 of the socket 44 and to precise concentricity relative to the longitudinal centerline 18 of the mast jacket.
- the housing 26 of the assist apparatus 12 is united with the mast jacket 14 by plugging the end plate 46 into the socket 44 .
- the cylindrical guide wall 42 closely surrounds the outer edge 50 of the flange portion of the end plate and cooperates therewith in guiding the end plate to a seated position, FIG. 3, in which the flange portion bears flush against the annular seat 40 with the longitudinal centerlines 38 , 18 of the housing and the mast jacket in precise colinear alignment.
- the bottom of the steering shaft 16 is connected to a steering gear, not shown, of the motor vehicle through a support in the internal chamber 34 of the assist apparatus housing so that manual effort applied at the steering handwheel is transferred to the steering gear.
- a transducer, not shown, in the internal chamber 34 monitors the direction and magnitude of the manual effort applied at the steering handwheel and provides a corresponding electronic signal to an electronic control module which turns the electric motor 28 on and off accordingly.
- Reduction gears, not shown, in the internal chamber 34 transfer torque from an output shaft of the electric motor to the steering shaft to supplement the manual effort applied at the steering handwheel.
- the precise alignment of the longitudinal centerlines 18 , 38 attained simply and automatically when the end plate 46 is plugged into the socket 44 to its seated position maximizes the structural integrity of the steering column and the functional reliability of the column mounted electric power assist apparatus 12 .
- the cylindrical guide wall 42 of the socket 44 is interrupted by an annular groove 52 in the housing 26 .
- a first side 54 of the groove 52 is separated in the direction of the centerline 38 of the housing from the seat 40 by a span which is slightly less than a thickness dimension “T 1 ”, FIG. 3, of the flange portion 48 of the end plate so that an outboard side 56 of the flange portion is slightly above the first side of the groove in the seated position of the end plate.
- a second side 58 of the annular groove 52 is separated from the first side by less than a thickness dimension “T 2 ” of a flat C-shaped retainer 60 .
- the retainer includes a pair of flexible arms 62 A, 62 B and a beveled shoulder 64 along an outer edge of the retainer.
- the arms 62 A, 62 B of the retainer are flexed resiliently toward each other to reduce the diameter of the retainer to less than the diameter of the guide wall 42 so that the retainer fits within the guide wall flush against the outboard surface 56 of the flange portion 48 and expands circumferentially into the annular groove 52 when the arms are released.
- the beveled shoulder 64 bears against and slides along the edge of the annular groove where the second side 58 thereof intersects the cylindrical guide wall to convert the expansion of the retainer into thrust on the flange portion toward the seat 40 .
- the retainer expands until it overlaps the flange portion and the annular groove 52 with the flange portion thrust firmly and flush against the seat 40 . Dislodgment of the end plate 46 from the socket 44 is thus foreclosed and all lash between the assist apparatus housing 26 and the mast jacket 14 in the direction of the centerlines 18 , 38 is eliminated with the simple step of releasing the arms 62 A, 62 B of the retainer. Because the assist apparatus housing 26 is secured to the mast jacket 14 without threaded fasteners, the steering column 10 according to this invention is less susceptible to misalignment between the centerlines 18 , 38 than comparable prior steering columns in which improper tightening of such threaded fasteners is known to contribute to such misalignment.
- the steering column 10 is supported on a motor vehicle body, not shown, at the tubular bosses 32 A, 32 B on the assist apparatus housing for up and down pivotal movement about a lateral axis 66 to adjust the vertical position of the steering handwheel on the steering shaft.
- a support bracket 68 surrounds the tubular upper portion 22 of the mast jacket and is attached to the vehicle body above the steering column through a pair of capsules 70 A, 70 B.
- a clamp between the mast jacket and the support bracket is actuated by a lever 72 to secure the mast jacket to and release the mast jacket from the support bracket.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
Abstract
Description
- This invention relates to a motor vehicle steering column having thereon an electric power assist apparatus.
- A typical motor vehicle steering column includes a tubular mast jacket supported on a body of the motor vehicle, a steering shaft supported on the mast jacket for rotation about a longitudinal centerline of the mast jacket, and a steering handwheel attached to the top of the steering shaft. Manual effort applied at the steering handwheel is transferred by the steering shaft to a steering gear of the motor vehicle connected to the bottom of the steering shaft. A “column mounted” electric power assist apparatus for supplementing the manual effort applied at the steering handwheel includes a housing rigidly attached to the bottom of the mast jacket, an electric motor supported on the housing, reduction gears in the housing for transferring the output torque of the electric motor to the steering shaft, a transducer in the housing for determining the magnitude and direction of the applied manual effort, and an electronic control for turning the electric motor on and off. For maximum structural integrity and functional reliability, it is imperative that the longitudinal centerline of the steering column be precisely aligned with a longitudinal centerline of the housing of the assist apparatus. To that end, it is known to weld an end plate to the bottom of the mast jacket, to guide the end plate to a seated position on the housing with guide pins on the housing and guide holes in the end plate, and to bolt the end plate to the housing. Manufacturers, however, continue to seek improved steering columns in which precise alignment of the housing of the electric power assist apparatus relative to the mast jacket is achieved reliably and at less manufacturing cost.
- This invention is a new and improved motor vehicle steering column having thereon a column mounted electric power assist apparatus including a tubular mast jacket, a structural housing of the assist apparatus, a socket in an end wall of the housing consisting of an annular seat in a plane perpendicular to a longitudinal centerline of the housing and a cylindrical guide wall around the annular seat machined concentric with the longitudinal centerline of the housing, and an annular end plate rigidly attached to the bottom of the mast jacket in a plane perpendicular to a longitudinal centerline thereof having a circular edge machined concentric with the longitudinal centerline of the mast jacket after the end plate is attached. The end plate plugs into the socket and bears flush against the seat with the circular edge of the end plate fitted closely in the cylindrical guide wall of the socket so that the longitudinal centerlines of the mast jacket and the housing are precisely aligned. A C-shaped retainer in an annular groove in the cylindrical guide wall overlaps the end plate to prevent dislodgment of the mast jacket from the housing. The retainer has a beveled shoulder which bears on an edge of the groove and converts resilient circumferential expansion of the retainer into longitudinal thrust on the end plate against the seat of the socket thereby to eliminate lash between the end plate and the housing in the direction of their longitudinal centerlines.
- FIG. 1 is a fragmentary exploded perspective view of a motor vehicle steering column according to this invention;
- FIG. 2 is a broken-away view of a structural housing of an electric power assist apparatus of the motor vehicle steering column according to this invention; and
- FIG. 3 is an enlarged view of the portion of FIG. 2 identified by the
reference circle 3 in FIG. 2. - Referring to FIG. 1, a motor
vehicle steering column 10 according to this invention includes a column mounted electricpower assist apparatus 12, a mast jacket 14, and asteering shaft 16 supported on the mast jacket for rotation about a longitudinal centerline 18 of the mast jacket. The mast jacket includes a tubularlower portion 20 and a tubularupper portion 22 supported on the lower portion for linear translation in the direction of the centerline 18. A steering handwheel, not shown, is rigidly attached to anupper end 24 of the steering shaft. - The column mounted electric
power assist apparatus 12 includes astructural housing 26 and anelectric motor 28 rigidly attached to the housing at amounting flange 30, FIG. 2. Thehousing 26 includes a pair of integral externaltubular mounting lugs internal chamber 34 open through anend wall 36 of the housing in a plane perpendicular to alongitudinal centerline 38 of the housing. Anannular seat 40 in a plane perpendicular to thecenterline 38 of the housing and acylindrical guide wall 42 machined to precise concentricity relative to thecenterline 38 constitute asocket 44 on the housing in theend wall 36. - An
annular end plate 46 is rigidly attached, preferably by fusion bonding, e.g. arc welding or spin welding, to the bottom of the mast jacket 14 at the exposed end of the tubularlower portion 20 of the mast jacket. The end plate includes an annularflat flange portion 48 in a plane perpendicular to the longitudinal centerline 18 of the mast jacket having an outercircular edge 50. After theend plate 46 is attached to the tubularlower portion 20 of the mast jacket, the outercircular edge 50 of the flange portion is machined to a diameter only slightly smaller than the diameter of thecylindrical guide wall 42 of thesocket 44 and to precise concentricity relative to the longitudinal centerline 18 of the mast jacket. - The
housing 26 of theassist apparatus 12 is united with the mast jacket 14 by plugging theend plate 46 into thesocket 44. Thecylindrical guide wall 42 closely surrounds theouter edge 50 of the flange portion of the end plate and cooperates therewith in guiding the end plate to a seated position, FIG. 3, in which the flange portion bears flush against theannular seat 40 with thelongitudinal centerlines 38, 18 of the housing and the mast jacket in precise colinear alignment. At the same time, the bottom of thesteering shaft 16 is connected to a steering gear, not shown, of the motor vehicle through a support in theinternal chamber 34 of the assist apparatus housing so that manual effort applied at the steering handwheel is transferred to the steering gear. - A transducer, not shown, in the
internal chamber 34 monitors the direction and magnitude of the manual effort applied at the steering handwheel and provides a corresponding electronic signal to an electronic control module which turns theelectric motor 28 on and off accordingly. Reduction gears, not shown, in theinternal chamber 34 transfer torque from an output shaft of the electric motor to the steering shaft to supplement the manual effort applied at the steering handwheel. Importantly, the precise alignment of thelongitudinal centerlines 18, 38 attained simply and automatically when theend plate 46 is plugged into thesocket 44 to its seated position maximizes the structural integrity of the steering column and the functional reliability of the column mounted electricpower assist apparatus 12. - The
cylindrical guide wall 42 of thesocket 44 is interrupted by anannular groove 52 in thehousing 26. Afirst side 54 of thegroove 52 is separated in the direction of thecenterline 38 of the housing from theseat 40 by a span which is slightly less than a thickness dimension “T1”, FIG. 3, of theflange portion 48 of the end plate so that anoutboard side 56 of the flange portion is slightly above the first side of the groove in the seated position of the end plate. A second side 58 of theannular groove 52 is separated from the first side by less than a thickness dimension “T2” of a flat C-shaped retainer 60. The retainer includes a pair offlexible arms beveled shoulder 64 along an outer edge of the retainer. - With the
end plate 46 in its seated position in thesocket 44, thearms guide wall 42 so that the retainer fits within the guide wall flush against theoutboard surface 56 of theflange portion 48 and expands circumferentially into theannular groove 52 when the arms are released. At the same time, thebeveled shoulder 64 bears against and slides along the edge of the annular groove where the second side 58 thereof intersects the cylindrical guide wall to convert the expansion of the retainer into thrust on the flange portion toward theseat 40. The retainer expands until it overlaps the flange portion and theannular groove 52 with the flange portion thrust firmly and flush against theseat 40. Dislodgment of theend plate 46 from thesocket 44 is thus foreclosed and all lash between theassist apparatus housing 26 and the mast jacket 14 in the direction of thecenterlines 18, 38 is eliminated with the simple step of releasing thearms assist apparatus housing 26 is secured to the mast jacket 14 without threaded fasteners, thesteering column 10 according to this invention is less susceptible to misalignment between thecenterlines 18, 38 than comparable prior steering columns in which improper tightening of such threaded fasteners is known to contribute to such misalignment. - The
steering column 10 is supported on a motor vehicle body, not shown, at thetubular bosses lateral axis 66 to adjust the vertical position of the steering handwheel on the steering shaft. Asupport bracket 68 surrounds the tubularupper portion 22 of the mast jacket and is attached to the vehicle body above the steering column through a pair ofcapsules lever 72 to secure the mast jacket to and release the mast jacket from the support bracket. With the mast jacket clamped to the support bracket, an impact on the steering handwheel reacts to the vehicle body through the uppertubular portion 22 of the mast jacket and initiates separation of themounting bracket 68 from thestationary capsules flat metal straps 74A, 74B anchored to the vehicle body whereby a fraction of the kinetic energy of the impact is converted into work. - While only a preferred embodiment of this invention has been described herein, it will be appreciated that other forms could be readily adapted by one skilled in the art. Accordingly, the scope of this invention is to be considered limited only by the following claims.
- The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/730,228 US6389924B1 (en) | 2000-12-05 | 2000-12-05 | Steering column for motor vehicle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/730,228 US6389924B1 (en) | 2000-12-05 | 2000-12-05 | Steering column for motor vehicle |
Publications (2)
Publication Number | Publication Date |
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US6389924B1 US6389924B1 (en) | 2002-05-21 |
US20020066333A1 true US20020066333A1 (en) | 2002-06-06 |
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ID=24934483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/730,228 Expired - Lifetime US6389924B1 (en) | 2000-12-05 | 2000-12-05 | Steering column for motor vehicle |
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US (1) | US6389924B1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020070618A1 (en) * | 2000-12-08 | 2002-06-13 | Riichiro Ikeda | Electric power steering apparatus |
US20050016314A1 (en) * | 2003-06-18 | 2005-01-27 | Shigetaka Kinme | Tilt steering assembly |
US20050242561A1 (en) * | 2002-07-25 | 2005-11-03 | Nsk Ltd. | Steering column device |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6550568B2 (en) * | 2001-05-29 | 2003-04-22 | Delphi Technologies, Inc. | Column assist isolation system |
US7591342B2 (en) * | 2001-08-01 | 2009-09-22 | Delphi Technologies, Inc. | Apparatus and method for steering a vehicle |
US7293626B2 (en) * | 2001-08-01 | 2007-11-13 | Delphi Technologies, Inc. | Apparatus and method for steering a vehicle |
US6488115B1 (en) * | 2001-08-01 | 2002-12-03 | Delphi Technologies, Inc. | Apparatus and method for steering a vehicle |
JP3975823B2 (en) * | 2002-05-15 | 2007-09-12 | 株式会社ジェイテクト | Vehicle steering system |
US6814374B2 (en) * | 2002-06-28 | 2004-11-09 | Delphi Technologies, Inc. | Steering column with foamed in-place structure |
US7048306B2 (en) * | 2002-09-05 | 2006-05-23 | Delphi Technologies, Inc. | Steering column with tubular structure |
US6854765B2 (en) * | 2002-09-23 | 2005-02-15 | Delphi Technologies, Inc. | Steering shaft assembly |
US6925714B2 (en) | 2002-12-19 | 2005-08-09 | Delphi Technologies, Inc. | Upper steering shaft-assembly |
US6829055B1 (en) | 2003-08-07 | 2004-12-07 | Delphi Technologies, Inc. | Angular position sensor assembly for use with steering column |
US7055647B2 (en) * | 2004-07-02 | 2006-06-06 | Nacam France Sa | Electrically-assisted steering mechanism for vehicles |
US20080093156A1 (en) * | 2006-10-24 | 2008-04-24 | Peringat Jagadish K | Modular steering gear housing |
JP2008184083A (en) * | 2007-01-31 | 2008-08-14 | Fuji Kiko Co Ltd | Variable steering angle ratio steering device |
US7866435B2 (en) * | 2008-04-21 | 2011-01-11 | Nexteer (Beijing) Technology Co., Ltd. | Electric power steering rotation isolator |
US10807633B2 (en) | 2017-05-12 | 2020-10-20 | Ka Group Ag | Electric power steering assembly and system with anti-rotation coupler |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4650019A (en) * | 1984-07-30 | 1987-03-17 | Nissan Motor Company, Limited | Electrical motor type power-steering system |
US5482128A (en) * | 1993-12-07 | 1996-01-09 | Koyo Seiko Co., Ltd. | Power steering apparatus |
US5664459A (en) * | 1995-03-21 | 1997-09-09 | Deutsche Star Gmbh | Rolling-member worm-drive |
US5738183A (en) * | 1995-06-14 | 1998-04-14 | Koyo Seiko Co., Ltd. | Motor operated power steering device |
US6129648A (en) * | 1997-11-19 | 2000-10-10 | Harmonic Drive Systems, Inc. | Planetary gear device |
-
2000
- 2000-12-05 US US09/730,228 patent/US6389924B1/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4650019A (en) * | 1984-07-30 | 1987-03-17 | Nissan Motor Company, Limited | Electrical motor type power-steering system |
US5482128A (en) * | 1993-12-07 | 1996-01-09 | Koyo Seiko Co., Ltd. | Power steering apparatus |
US5664459A (en) * | 1995-03-21 | 1997-09-09 | Deutsche Star Gmbh | Rolling-member worm-drive |
US5738183A (en) * | 1995-06-14 | 1998-04-14 | Koyo Seiko Co., Ltd. | Motor operated power steering device |
US6129648A (en) * | 1997-11-19 | 2000-10-10 | Harmonic Drive Systems, Inc. | Planetary gear device |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020070618A1 (en) * | 2000-12-08 | 2002-06-13 | Riichiro Ikeda | Electric power steering apparatus |
US6913108B2 (en) * | 2000-12-08 | 2005-07-05 | Koyo Seiko Co., Ltd. | Electric power steering apparatus |
US20050242561A1 (en) * | 2002-07-25 | 2005-11-03 | Nsk Ltd. | Steering column device |
US20050016314A1 (en) * | 2003-06-18 | 2005-01-27 | Shigetaka Kinme | Tilt steering assembly |
EP1488984A3 (en) * | 2003-06-18 | 2005-04-13 | Koyo Seiko Co., Ltd. | Tilt steering assembly |
US7275458B2 (en) | 2003-06-18 | 2007-10-02 | Jtekt Corporation | Tilt steering assembly |
Also Published As
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