GB977434A - Improvements in variable-ratio toothed gearing mechanisms - Google Patents

Improvements in variable-ratio toothed gearing mechanisms

Info

Publication number
GB977434A
GB977434A GB2741162A GB2741162A GB977434A GB 977434 A GB977434 A GB 977434A GB 2741162 A GB2741162 A GB 2741162A GB 2741162 A GB2741162 A GB 2741162A GB 977434 A GB977434 A GB 977434A
Authority
GB
United Kingdom
Prior art keywords
teeth
pinion
pitch
sections
rack
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.)
Expired
Application number
GB2741162A
Inventor
Henry Edward Merritt
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.)
Merritt & Co Engineering Ltd
Original Assignee
Merritt & Co Engineering 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 Merritt & Co Engineering Ltd filed Critical Merritt & Co Engineering Ltd
Priority to GB2741162A priority Critical patent/GB977434A/en
Publication of GB977434A publication Critical patent/GB977434A/en
Expired 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
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/08—Profiling
    • F16H55/0806—Involute profile
    • 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
    • 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
    • F16H55/08—Profiling
    • F16H2055/0893—Profiling for parallel shaft arrangement of toothed members

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)

Abstract

977,434. Toothed gearing. MERRITT & CO. (ENGINEERING) Ltd. Sept. 25, 1963 [July 17, 1962], No. 27411/62. Heading F2Q. In a variable ratio toothed gear mechanism a circular driving pinion 1, concentrically mounted and having all its teeth identical, meshes with a rack or sector 2 having at least one group of teeth of progressively varying form and pitch. In a vehicle steering gear, a rack has a central section 2 with teeth 3 at a minimum pitch, end sections 2a with teeth 8 at a maximum pitch, and transition sections 2b having progressively varying tooth pitch. At sections 2a the straight sided teeth 8 have a larger contact angle than the teeth 3 at section 2, so that the effective pitch circle 10 of the pinion 1 when meshed with section 2a is of greater diameter than the effective pitch circle 4 of the pinion when meshed with section 2. At sections 2b, the rack pitch line 12 is not linear, and the pitch line 11 of the pinion is not circular, the rack being accelerated when these sections pass under the pinion. A method of constructing the profiles of the transition teeth is described. The pinion 1 may be driven directly by a hand wheel, or through reduction gears which may themselves be of variable ratio, and a servo mechanism may be combined with the gearing mechanism of the invention.
GB2741162A 1962-07-17 1962-07-17 Improvements in variable-ratio toothed gearing mechanisms Expired GB977434A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2741162A GB977434A (en) 1962-07-17 1962-07-17 Improvements in variable-ratio toothed gearing mechanisms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2741162A GB977434A (en) 1962-07-17 1962-07-17 Improvements in variable-ratio toothed gearing mechanisms

Publications (1)

Publication Number Publication Date
GB977434A true GB977434A (en) 1964-12-09

Family

ID=10259135

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2741162A Expired GB977434A (en) 1962-07-17 1962-07-17 Improvements in variable-ratio toothed gearing mechanisms

Country Status (1)

Country Link
GB (1) GB977434A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135013A (en) * 1983-02-10 1984-08-22 Tokai Trw & Co Variable ratio rack pinion steering gear and method for cutting rack teeth therein
GB2169567A (en) * 1985-01-11 1986-07-16 Trw Cam Gears Ltd Power assisted steering gear assembly
EP3281843A1 (en) * 2016-08-10 2018-02-14 Jtekt Corporation Steering system
CN107757590A (en) * 2017-10-16 2018-03-06 上海同驭汽车科技有限公司 The rack and pinion drive mechanism and EHB of a kind of variable ratio

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135013A (en) * 1983-02-10 1984-08-22 Tokai Trw & Co Variable ratio rack pinion steering gear and method for cutting rack teeth therein
GB2169567A (en) * 1985-01-11 1986-07-16 Trw Cam Gears Ltd Power assisted steering gear assembly
EP3281843A1 (en) * 2016-08-10 2018-02-14 Jtekt Corporation Steering system
CN107719462A (en) * 2016-08-10 2018-02-23 株式会社捷太格特 Steering apparatus
US10150498B2 (en) 2016-08-10 2018-12-11 Jtekt Corporation Steering system
CN107757590A (en) * 2017-10-16 2018-03-06 上海同驭汽车科技有限公司 The rack and pinion drive mechanism and EHB of a kind of variable ratio

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