GB2397861A - A rack and pinion guide - Google Patents
A rack and pinion guide Download PDFInfo
- Publication number
- GB2397861A GB2397861A GB0326571A GB0326571A GB2397861A GB 2397861 A GB2397861 A GB 2397861A GB 0326571 A GB0326571 A GB 0326571A GB 0326571 A GB0326571 A GB 0326571A GB 2397861 A GB2397861 A GB 2397861A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rack
- yoke
- guide
- adjuster
- noise
- 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
Links
- 229910000831 Steel Inorganic materials 0.000 claims abstract 2
- 230000003100 immobilizing effect Effects 0.000 claims abstract 2
- 239000010959 steel Substances 0.000 claims abstract 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D3/00—Steering gears
- B62D3/02—Steering gears mechanical
- B62D3/12—Steering gears mechanical of rack-and-pinion type
- B62D3/123—Steering gears mechanical of rack-and-pinion type characterised by pressure yokes
-
- 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
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/26—Racks
- F16H55/28—Special devices for taking up backlash
- F16H55/283—Special devices for taking up backlash using pressure yokes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- General Engineering & Computer Science (AREA)
- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
- Vibration Prevention Devices (AREA)
- Transmission Devices (AREA)
- Support Of The Bearing (AREA)
- Power Steering Mechanism (AREA)
Abstract
A guide for the rack 15 of a rack 15 and pinion 14 steering box, comprising a yoke 17 over which the rack 15 moves, a rack adjuster 18 immobilizing the yoke 17 within a corresponding seat provided in the body 13 of the steering box, an elastic member 19 located between the said rack adjuster 18 and the yoke 17 to keep the latter in contact with the rack 15, characterized in that the guide also comprises a noise-preventing member 20 located between the yoke 17 and the rack adjuster 18 to attenuate the axial vibrations induced by the guide when the vehicle is in use. The elastic member 19 may be a helical spring 19, while the noise-preventing member 20 is a ring which could be bonded to the yoke 17 or the rack adjuster 18. The noise preventing ring 20 is preferably made of a plurality of layers of steel and rubber.
Description
239786 1
RACK GUIDE FOR STEERING SYSTEMS
This invention relates to steering systems for motor vehicles comprising rack and pinion steering and relates in particular to the rack guides.
As is known, a steering system substantially comprises steering column, an intermediate shaft and a steering box into which a rack and pinion mechanism is inserted. Rotation of the wheel, assisted by the steering column, is converted into lateral movement of the rack and pinion mechanism within the steering box, which moves the wheels to permit steering. In its lateral movements the rack is supported by a guide which needs an appropriate amount of play for correct functioning of the mechanism.
Generally guides comprise a member supporting the movement proper, known as a yoke, housed in a seat provided in the steering box and configured to enclose the rack, a rack adjuster immobilising the yoke in its respective seat and a helical spring located between the yoke and the rack 2 0 adjuster to provide the necessary axial play for the guide and to compensate for inevitable wear of the yoke.
Because of the aforesaid play, however, axial vibrations are set up in the guide which are substantial, especially when the vehicle is used on rough ground, and gives rise to an irksome noise on account of the metallic nature of the components.
The purpose of this invention is to overcome such a disadvantage by providing a guide which envisages the use of a noise-preventing ring of suitable material and thickness between the yoke and the corresponding rack adjuster designed to attenuate the axial vibration induced in the yoke, especially in the range of frequencies which can be perceived by the human ear.
The invention will be described, by way of example, with reference to theaccompanying drawings, in which: Figure 1 shows a rack and pinion steering box in perspective view, Figure 2 shows the elements of the guide in an exploded perspective view, and - 2 Figure 3 shows a cross- section of the steering box corresponding to a guide.
With reference to Figure 1, a steering box 11 of a mechanical or hydraulic type for conversion of the rotational movement of steering column 12 into a lateral movement controlling the wheels is illustrated. Steering box 11 comprises, in a known manner, a body 13 containing a pinion 14 and a rack 15 meshing therewith. The rack 15, which moves within the body of the steering box, is supported by a bush - not shown - and a guide 16 housed in a corresponding seat provided in the said body 13.
The guide 16 comprises a yoke 17 over which the rack 15 moves, a rack adjuster 18 locking the yoke in the corresponding seat, a helical spring 19 located between the rack adjuster and the yoke to keep the latter in contact with rack 15, and a noise-preventing ring 20 also provided between the yoke and the rack adjuster coaxially with spring 19.
Yoke 17 and rack adjuster 18 have corresponding opposing axial seats to support the ends of helical spring 19 and corresponding opposing 2 0 annular surfaces 17', 18' between which noise-preventing ring 20 is located. The latter may also be bonded to one of the said annular surfaces.
Advantageously ring 20 is a multilayer ring made of sheets of stainless steel and rubber, the thickness of which is selected according to the frequency range in which it is intended that the vibration should be 2 5 attenuated.
In practice the axial vibrations induced in the guide through use of the vehicle, in particular on rough ground, are damped by the noise preventing ring, particularly in the range of frequencies which can be perceived by the human ear. Such a damping function is appreciable both when the vehicle is new and after a high mileage, because wear of the yoke increases the play in the rack. - 3
Claims (5)
1. Guide for the rack of a rack and pinion steering box in a steering system, comprising a yoke (17) over which the rack (15) moves, a rack adjuster (18) immobilizing the yoke within a corresponding seat provided in the body of the steering box and open towards the rack, and an elastic member (19) located between the said rack adjuster and the yoke to keep the latter in contact with the rack, characterized in that it also comprises a noise-preventing member (20) located between the yoke and the rack adjuster to attenuate the axial vibrations induced by the guide when the vehicle is in use.
2. Guide according to claim 1, in which the elastic member is a helical spring restrained between two axial seats made opposite each other in the yoke and the rack adjuster, in which the noise-preventing member is a ring located between two facing annular surfaces bounding the said spring seats.
3. Guide according to claim 2, in which the noise-preventing ring is bonded to one of the said annular surfaces of the yoke and the rack adjuster.
4. Guide according to according to any one of the preceding claims, in which the noise-preventing ring comprises a plurality of layers or sheets of steel and rubber, the thickness of which is selected to attenuate vibrations in a desired frequency range.
5. Guide for the rack of a rack and pinion steering box in a steering system, substantially as herein desribed with reference to the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000011U ITBS20030011U1 (en) | 2003-01-29 | 2003-01-29 | RACK SLIDING SHOE FOR STEERING SYSTEMS |
Publications (3)
Publication Number | Publication Date |
---|---|
GB0326571D0 GB0326571D0 (en) | 2003-12-17 |
GB2397861A true GB2397861A (en) | 2004-08-04 |
GB2397861B GB2397861B (en) | 2005-08-03 |
Family
ID=29727254
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0326571A Expired - Fee Related GB2397861B (en) | 2003-01-29 | 2003-11-14 | Rack guide for steering systems |
Country Status (5)
Country | Link |
---|---|
DE (1) | DE10349787A1 (en) |
ES (1) | ES2246666B1 (en) |
FR (1) | FR2850345B1 (en) |
GB (1) | GB2397861B (en) |
IT (1) | ITBS20030011U1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1808355A1 (en) | 2006-01-12 | 2007-07-18 | TRW ITALIA S.p.A. | Steering group with longitudinally extended support element |
EP2347944A3 (en) * | 2010-01-21 | 2011-08-24 | Jtekt Corporation | Rack-and-pinion mechanism and steering system |
GB2533985A (en) * | 2015-01-09 | 2016-07-13 | Showa Corp | Rack guide mechanism |
US20180257697A1 (en) * | 2017-03-08 | 2018-09-13 | Mando Corporation | Rack bar supporting device of steering apparatus for vehicle |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1235458A (en) * | 1970-03-09 | 1971-06-16 | Cam Gears Ltd | Improvements in or relating to rack and pinion assemblies |
US4788878A (en) * | 1986-06-16 | 1988-12-06 | Nissan Motor Company, Limited | Rack and pinion steering gear |
GB2333079A (en) * | 1998-01-09 | 1999-07-14 | Trw Steering Systems Limited | Rack and pinion assembly |
EP1086880A2 (en) * | 1999-09-23 | 2001-03-28 | Delphi Technologies, Inc. | Automotive steering gear |
EP1184255A2 (en) * | 2000-08-30 | 2002-03-06 | Koyo Seiko Co., Ltd. | Rack-pinion type steering apparatus |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2180157A5 (en) * | 1972-04-10 | 1973-11-23 | Gemmer France | |
JPS59216764A (en) * | 1983-05-24 | 1984-12-06 | Toyota Motor Corp | Rack and pinion type steering device |
US4785685A (en) * | 1986-04-09 | 1988-11-22 | Toyota Jidosha Kabushiki Kaisha | Rack guide of synthetic resin for a rack and pinion type steering device |
US4924976A (en) * | 1987-09-04 | 1990-05-15 | Digital Equipment Corporation | Tuned array vibration absorber |
US5022279A (en) * | 1988-11-08 | 1991-06-11 | Koyo Seiko Co., Ltd. | Rack and pinion steering device |
-
2003
- 2003-01-29 IT IT000011U patent/ITBS20030011U1/en unknown
- 2003-10-24 DE DE10349787A patent/DE10349787A1/en not_active Withdrawn
- 2003-11-03 FR FR0312862A patent/FR2850345B1/en not_active Expired - Fee Related
- 2003-11-10 ES ES200302617A patent/ES2246666B1/en not_active Expired - Fee Related
- 2003-11-14 GB GB0326571A patent/GB2397861B/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1235458A (en) * | 1970-03-09 | 1971-06-16 | Cam Gears Ltd | Improvements in or relating to rack and pinion assemblies |
US4788878A (en) * | 1986-06-16 | 1988-12-06 | Nissan Motor Company, Limited | Rack and pinion steering gear |
GB2333079A (en) * | 1998-01-09 | 1999-07-14 | Trw Steering Systems Limited | Rack and pinion assembly |
EP1086880A2 (en) * | 1999-09-23 | 2001-03-28 | Delphi Technologies, Inc. | Automotive steering gear |
EP1184255A2 (en) * | 2000-08-30 | 2002-03-06 | Koyo Seiko Co., Ltd. | Rack-pinion type steering apparatus |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1808355A1 (en) | 2006-01-12 | 2007-07-18 | TRW ITALIA S.p.A. | Steering group with longitudinally extended support element |
EP2347944A3 (en) * | 2010-01-21 | 2011-08-24 | Jtekt Corporation | Rack-and-pinion mechanism and steering system |
US8348289B2 (en) | 2010-01-21 | 2013-01-08 | Jtekt Corporation | Rack-and-pinion mechanism and steering system |
GB2533985A (en) * | 2015-01-09 | 2016-07-13 | Showa Corp | Rack guide mechanism |
US20180257697A1 (en) * | 2017-03-08 | 2018-09-13 | Mando Corporation | Rack bar supporting device of steering apparatus for vehicle |
US10960918B2 (en) * | 2017-03-08 | 2021-03-30 | Mando Corporation | Rack bar supporting device of steering apparatus for vehicle |
Also Published As
Publication number | Publication date |
---|---|
GB2397861B (en) | 2005-08-03 |
ITBS20030011U1 (en) | 2004-07-30 |
ES2246666B1 (en) | 2006-12-01 |
FR2850345A1 (en) | 2004-07-30 |
GB0326571D0 (en) | 2003-12-17 |
ES2246666A1 (en) | 2006-02-16 |
FR2850345B1 (en) | 2007-10-26 |
DE10349787A1 (en) | 2004-08-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20201114 |