GB2204933A - Rack and pinion steering gear - Google Patents

Rack and pinion steering gear Download PDF

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Publication number
GB2204933A
GB2204933A GB08711730A GB8711730A GB2204933A GB 2204933 A GB2204933 A GB 2204933A GB 08711730 A GB08711730 A GB 08711730A GB 8711730 A GB8711730 A GB 8711730A GB 2204933 A GB2204933 A GB 2204933A
Authority
GB
United Kingdom
Prior art keywords
rack
steering gear
length
pinion steering
bar
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
Application number
GB08711730A
Other versions
GB8711730D0 (en
GB2204933B (en
Inventor
Alan Jones
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Burman and Sons Ltd
Original Assignee
Burman and Sons Ltd
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 Burman and Sons Ltd filed Critical Burman and Sons Ltd
Priority to GB8711730A priority Critical patent/GB2204933B/en
Publication of GB8711730D0 publication Critical patent/GB8711730D0/en
Publication of GB2204933A publication Critical patent/GB2204933A/en
Application granted granted Critical
Publication of GB2204933B publication Critical patent/GB2204933B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • F16H19/00—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion
    • F16H19/02—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion
    • F16H19/04—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising a rack
    • 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)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Transmission Devices (AREA)

Abstract

A rack and pinion steering gear which is intended for use in a road or other vehicle utilises a rack 11 which is initially of polygonal form in cross- section along the whole of its length, teeth 17 being machined along a part of the length of said rack. <IMAGE>

Description

"RACK AND PINION STEERING GEAR" This invention relates to a rack and pinion steering gear which is intended for use in a road or other vehicle, the object of the invention being to provide such a steering gear in an improved form which is economical to manufacture.
In accordance with the invention, there is provided a rack and pinion steering gear wherein the rack is formed from a length of bar which is initially of polygonal form in cross-section along the whole of its length, the rack teeth being formed along a part of the length of said bar by means of a machining operation.
Preferably, said bar is initially of regular hexagonal configuration in cross-section along the whole of its length, the toothed part of the rack being machined in forming the teeth so that two adjacent sides of the hexagonal configuration are removed.
The invention will now be more particularly described with reference to the accompanying drawing which is a sectional view of one example of a rack and pinion steering gear in accordance with the invention.
Referring now to the drawing there is shown therein a rack and pinion steering mechanism intended for use in a road or other vehicle, the pinion being indicated by reference numeral 10 and the rack by reference numeral 11. In the example shown the steering gear is power actuated by means of pressurised hydraulic fluid. Thus said pinion 10 forms part of an hydraulic valve, one end of said pinion being formed with teeth 12 whilst the other end is extended to form a sleeve 13 within which is located a valve core 14 which projects at one end from the sleeve namely end 15 which in use would be connected to the driver actuabl e steering wheel of the vehicle concerned.Said valve core 14 and pinion/sleeve 10, 13 are mounted within a housing 16 and relative rotation of the core 14 relative to the sleeve 13 (effected by turning the vehicle steering wheel) has the effect of directing pressurised fluid into one end or the other of a cylinder within which said rack 11 is mounted, thereby providing power assistance for longitudinal movement of said rack. The aforesaid extension 15 of the core 14 is pinned to one end of a torsion bar, the other end of said bar being pinned to the pinion 10. Furthermore opposite ends of said rack 11 would be connected in use to any known mechanism for effecting steerable movement of the associated vehicle wheels. However details of the construction of the aforementioned briefly described power actuated steering mechanism form no part of the present invention.
In accordance with the present invention the aforesaid rack 11 is formed from a metal bar of polygonal configuration in cross-section and conveniently said bar has a cross-section of regular hexagonal configuration. Said bar is then machined so as to remove material along a part of the length of the bar in order to form the rack teeth as indicated by reference numeral 17, such teeth engaging in operation with the pinion teeth 12. In carrying out such machining operation four of the original six sides of the hexagonal bar remain in the machined portion and are indicated respectively by reference numerals 18, 19, 20 and 21 so that the other two adjacent sides of the original hexagon will be removed in forming said teeth 17.
There is also provided within the housing 16 a plug 22 which is shaped so that its inner end is of generally V-shaped configuration a low friction pad which may be formed for example of p.t.f.e. or similar material, said pad being indicated by reference numeral 23, being inserted between the inner end of said plug 22 and the adjacent sides 19 and 20 of the rack 11.
The plug 22 is mounted within a recess formed in the housing 16, said recess being closed by means of a cover plate 24 which is secured to the housing by means of two screws of which one, indicated by reference numeral 25 is shown in the drawing. There is also provided a compression spring 26 which is located between the inner face of the cover plate 24 and the base of a recess formed in the plug 22, said spring exerting an inward force on the plug in order to maintain a corresponding inward force on the rack 11 so as to ensure that the teeth 17 of the rack and the teeth 12 of the pinion are maintained in the desired relationship which eliminates any unwanted play. The force exerted by said spring can be controlled by a shim 27 which is inserted between said cover plate 24 and the adjacent part of the housing 16.
There is also provided a removeable screw 28 which is engageable with a threaded aperture formed in the cover plate 24 which is aligned with a further aperture 29 formed in the plug 22. The back of the rack 11 is also formed with a recess 30 having a diameter which is the same as the diameter of said aperture 29 and initially, when setting up the steering gear assembly the screw 28 is removed and a pin is inserted into the assembly so that it extends into the aperture 29 and the rack moved until the pin can enter also the recess 30 and this procedure is adopted in order to set the rack 11 in its mid-position when the aforesaid torsion bar is not stressed so that the steering gear is in its neutral position. The aforesaid pin can then be removed and the screw 28 replaced.

Claims (3)

1. A rack and pinion steering gear wherein the rack is formed from a length of bar which is initially of polygonal form in cross-section along the whole of its length, the rack teeth being formed along a part of the length of said bar by means of a machining operation.
2. A rack and pinion steering gear as claimed in Claim 1 wherein said bar is initially of regular hexagonal configuration in cross-section along the whole of its length, the toothed part of the rack being machined in forming the teeth so that two adjacent sides of the hexagonal configuration are removed.
3. A rack and pinion steering gear substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
GB8711730A 1987-05-19 1987-05-19 Rack and pinion steering gear Expired - Fee Related GB2204933B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8711730A GB2204933B (en) 1987-05-19 1987-05-19 Rack and pinion steering gear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8711730A GB2204933B (en) 1987-05-19 1987-05-19 Rack and pinion steering gear

Publications (3)

Publication Number Publication Date
GB8711730D0 GB8711730D0 (en) 1987-06-24
GB2204933A true GB2204933A (en) 1988-11-23
GB2204933B GB2204933B (en) 1990-08-15

Family

ID=10617540

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8711730A Expired - Fee Related GB2204933B (en) 1987-05-19 1987-05-19 Rack and pinion steering gear

Country Status (1)

Country Link
GB (1) GB2204933B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2857425A1 (en) * 2003-07-11 2005-01-14 Koyo Steering Europe Kse Yoke device for rack-and pinion steering gear of motor vehicle, has concave profile face including interchangeable shoe plate fixed to end of yoke body, where shoe plate comprises of concave side and convex side
EP2906459A4 (en) * 2012-09-30 2016-04-27 Saint Gobain Performance Plast Steering yoke assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB976661A (en) * 1960-03-02 1964-12-02 Cam Gears Ltd A new or improved rack and pinion steering gear
GB2054798A (en) * 1979-06-23 1981-02-18 Trico Folberth Ltd Fluid pressure actuators
GB2068593A (en) * 1979-12-25 1981-08-12 Nissan Motor Automatic control of vehicle air conditioners
GB2096729A (en) * 1981-03-24 1982-10-20 Cam Gears Ltd A rack bar and pinion assembly and a steering gear including such an assembly
GB2188119A (en) * 1986-03-19 1987-09-23 Trw Cam Gears Ltd A rack and pinion gear assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB976661A (en) * 1960-03-02 1964-12-02 Cam Gears Ltd A new or improved rack and pinion steering gear
GB2054798A (en) * 1979-06-23 1981-02-18 Trico Folberth Ltd Fluid pressure actuators
GB2068593A (en) * 1979-12-25 1981-08-12 Nissan Motor Automatic control of vehicle air conditioners
GB2096729A (en) * 1981-03-24 1982-10-20 Cam Gears Ltd A rack bar and pinion assembly and a steering gear including such an assembly
GB2188119A (en) * 1986-03-19 1987-09-23 Trw Cam Gears Ltd A rack and pinion gear assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2857425A1 (en) * 2003-07-11 2005-01-14 Koyo Steering Europe Kse Yoke device for rack-and pinion steering gear of motor vehicle, has concave profile face including interchangeable shoe plate fixed to end of yoke body, where shoe plate comprises of concave side and convex side
EP2906459A4 (en) * 2012-09-30 2016-04-27 Saint Gobain Performance Plast Steering yoke assembly

Also Published As

Publication number Publication date
GB8711730D0 (en) 1987-06-24
GB2204933B (en) 1990-08-15

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940519