GB2116646A - Improvements in the lubrication of rack and pinion apparatus - Google Patents

Improvements in the lubrication of rack and pinion apparatus Download PDF

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Publication number
GB2116646A
GB2116646A GB08306681A GB8306681A GB2116646A GB 2116646 A GB2116646 A GB 2116646A GB 08306681 A GB08306681 A GB 08306681A GB 8306681 A GB8306681 A GB 8306681A GB 2116646 A GB2116646 A GB 2116646A
Authority
GB
United Kingdom
Prior art keywords
rack
bush
pinion
lubricant
teeth
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
GB08306681A
Other versions
GB8306681D0 (en
GB2116646B (en
Inventor
Peter Erenest Harding
Richard George Symes
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.)
HARCROSS ENGINEERING
Original Assignee
HARCROSS ENGINEERING
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 HARCROSS ENGINEERING filed Critical HARCROSS ENGINEERING
Priority to GB08306681A priority Critical patent/GB2116646B/en
Publication of GB8306681D0 publication Critical patent/GB8306681D0/en
Publication of GB2116646A publication Critical patent/GB2116646A/en
Application granted granted Critical
Publication of GB2116646B publication Critical patent/GB2116646B/en
Expired legal-status Critical Current

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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
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/041—Coatings or solid lubricants, e.g. antiseize layers or pastes
    • 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
    • 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
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0463—Grease lubrication; Drop-feed lubrication
    • 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
    • F16N—LUBRICATING
    • F16N15/00—Lubrication with substances other than oil or grease; Lubrication characterised by the use of particular lubricants in particular apparatus or conditions
    • F16N15/02—Lubrication with substances other than oil or grease; Lubrication characterised by the use of particular lubricants in particular apparatus or conditions with graphite or graphite-containing compositions

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Of Bearings (AREA)

Abstract

A rack and pinion apparatus has lubrication for the rack (14) provided by a split bush (20) of graphite or other solid lubricant. The bush is pressed into contact with the surface of the rack by means of a circumferential spring (22), a sealing lip (23) being provided between the spring (22) and the bush (20) to seal the interior of the apparatus against dust and other foreign matter. The graphite lubricates not only the bearing surfaces (15 and 16) for the rack (14) but also the teeth on the rack and the pinion (11). <IMAGE>

Description

SPECIFICATION Improvements in the lubrication of rack and pinion apparatus This invention is concerned with the lubrication of rack and pinion apparatus.
Die lifters are used extensively in the car industry and to meet the demands of the production line must operate reliably for many thousands of cycles with minimal maintenance. Die lifters are essentially rack and pinion devices and satisfactory lubrication is a problem that has existed for many years. In particular, it is now the practice in the car industry to steam clean dies and this practice very effectively cleans grease lubricants out of the die lifters requiring them to be re-lubricated.
It is therefore an object of the present invention to provide improved lubrication of rack and pinion apparatus.
The present invention is rack and pinion apparatus comprising a rotatable pinion, a reciprocating rack having teeth in engagement with the teeth of the pinion, bearings for said rack and a supply of lubricant for said bearings, said supply comprising solid lubricant constrained to press against said rack while aliowing the rack to move relative to the lubricant.
The lubricant may be provided in the form of a split bush.
Preferably a constraining spring is provided around the periphery of the bush to press the internal bush surface onto the rack.
A sealing lip may be provided between the spring and the periphery of the bush.
An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawing which is a cross-section of a rack and pinion gearbox.
Referring now to the drawing, a rack and pinion gearbox is provided with a housing 10 in which is mounted a pinion 11 on a shaft 12. The shaft 12 is supported in nylon bushes (not illustrated) filled with a solid lubricant, namely molybdenum disulphide.
Teeth 13 on a reciprocable rack 14 engage the teeth of the pinion, and the rack 14 is mounted on bearing surfaces 15 and 16 in the housing 10.
At the outer end of each of the bearing surfaces 15 and 16 is provided a supply of lubricant in the form of a split bush 20 of solid lubricant, in this embodiment graphite. The bush 20 has an external flange 21 located againstthe housing 10.Acircumferential constraining spring 22 bears on a sealing lip 23 to seal it against the periphery of the bush 20 and so retains the halves of the bush 20 in contact with the shaft despite wear. The sealing lip 23 is preferably elastomeric and is bonded to a metal reinforcement ring 24 which is mounted in and seals against the housing 10. In this way the bushing is retained in the housing by the flange between the sealing lip and the housing and foreign matter such as dust is excluded from the interior of the housing.
In use, the lubricant from the bush 20 is deposited on the surface of the rack 14 and conveyed onto the bearing surfaces 15 and 16. Also particles of lubricant are shaved off the bushing by the teeth of the rack and are deposited on the pinion thus providing satisfactory lubrication for the gearbox over a long period. It should also be noted that if the bush 20 wears out it is a quick and simple operation to replace it with a new bush.
It has also been found, somewhat surprisingly, that the bushing 20 and the lubricant coating on the various surfaces survive steam cleaning so that the apparatus requires no lubrication.
Molybdenum disulphide is also a suitable solid lubricant.
1. Apparatus comprising a rotatable pinion, a reciprocating rack having teeth in engagement with the teeth of the pinion, bearings for said rack and a supply of lubricant for said bearings, said supply comprising solid lubricant constrained to press against said rack while allowing the rack to move relative to the lubricant.
2. Apparatus as claimed in claim 1, in which the lubricant is provided in the form of a split bush.
3. Apparatus as claimed in claim 2, in which a constraining spring is provided around the periphery of the bush to press the internal bush surface onto the rack.
4. Apparatus as claimed in claim 2 or claim 3, in which a sealing lip is provided between the spring and the periphery of the bush.
5. Apparatus substantially as hereinbefore described with reference to, and as shown in, the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in the lubrication of rack and pinion apparatus This invention is concerned with the lubrication of rack and pinion apparatus. Die lifters are used extensively in the car industry and to meet the demands of the production line must operate reliably for many thousands of cycles with minimal maintenance. Die lifters are essentially rack and pinion devices and satisfactory lubrication is a problem that has existed for many years. In particular, it is now the practice in the car industry to steam clean dies and this practice very effectively cleans grease lubricants out of the die lifters requiring them to be re-lubricated. It is therefore an object of the present invention to provide improved lubrication of rack and pinion apparatus. The present invention is rack and pinion apparatus comprising a rotatable pinion, a reciprocating rack having teeth in engagement with the teeth of the pinion, bearings for said rack and a supply of lubricant for said bearings, said supply comprising solid lubricant constrained to press against said rack while aliowing the rack to move relative to the lubricant. The lubricant may be provided in the form of a split bush. Preferably a constraining spring is provided around the periphery of the bush to press the internal bush surface onto the rack. A sealing lip may be provided between the spring and the periphery of the bush. An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawing which is a cross-section of a rack and pinion gearbox. Referring now to the drawing, a rack and pinion gearbox is provided with a housing 10 in which is mounted a pinion 11 on a shaft 12. The shaft 12 is supported in nylon bushes (not illustrated) filled with a solid lubricant, namely molybdenum disulphide. Teeth 13 on a reciprocable rack 14 engage the teeth of the pinion, and the rack 14 is mounted on bearing surfaces 15 and 16 in the housing 10. At the outer end of each of the bearing surfaces 15 and 16 is provided a supply of lubricant in the form of a split bush 20 of solid lubricant, in this embodiment graphite. The bush 20 has an external flange 21 located againstthe housing 10.Acircumferential constraining spring 22 bears on a sealing lip 23 to seal it against the periphery of the bush 20 and so retains the halves of the bush 20 in contact with the shaft despite wear. The sealing lip 23 is preferably elastomeric and is bonded to a metal reinforcement ring 24 which is mounted in and seals against the housing 10. In this way the bushing is retained in the housing by the flange between the sealing lip and the housing and foreign matter such as dust is excluded from the interior of the housing. In use, the lubricant from the bush 20 is deposited on the surface of the rack 14 and conveyed onto the bearing surfaces 15 and 16. Also particles of lubricant are shaved off the bushing by the teeth of the rack and are deposited on the pinion thus providing satisfactory lubrication for the gearbox over a long period. It should also be noted that if the bush 20 wears out it is a quick and simple operation to replace it with a new bush. It has also been found, somewhat surprisingly, that the bushing 20 and the lubricant coating on the various surfaces survive steam cleaning so that the apparatus requires no lubrication. Molybdenum disulphide is also a suitable solid lubricant. CLAIMS
1. Apparatus comprising a rotatable pinion, a reciprocating rack having teeth in engagement with the teeth of the pinion, bearings for said rack and a supply of lubricant for said bearings, said supply comprising solid lubricant constrained to press against said rack while allowing the rack to move relative to the lubricant.
2. Apparatus as claimed in claim 1, in which the lubricant is provided in the form of a split bush.
3. Apparatus as claimed in claim 2, in which a constraining spring is provided around the periphery of the bush to press the internal bush surface onto the rack.
4. Apparatus as claimed in claim 2 or claim 3, in which a sealing lip is provided between the spring and the periphery of the bush.
5. Apparatus substantially as hereinbefore described with reference to, and as shown in, the accompanying drawing.
GB08306681A 1982-03-17 1983-03-11 Improvements in the lubrication of rack and pinion apparatus Expired GB2116646B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08306681A GB2116646B (en) 1982-03-17 1983-03-11 Improvements in the lubrication of rack and pinion apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8207827 1982-03-17
GB08306681A GB2116646B (en) 1982-03-17 1983-03-11 Improvements in the lubrication of rack and pinion apparatus

Publications (3)

Publication Number Publication Date
GB8306681D0 GB8306681D0 (en) 1983-04-20
GB2116646A true GB2116646A (en) 1983-09-28
GB2116646B GB2116646B (en) 1985-07-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08306681A Expired GB2116646B (en) 1982-03-17 1983-03-11 Improvements in the lubrication of rack and pinion apparatus

Country Status (1)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0404006A1 (en) * 1989-06-23 1990-12-27 Power Components, Inc. Rack and pinion lifter
EP0551028A1 (en) * 1991-11-08 1993-07-14 Neyrpic Framatome Mecanique Method and device for lubricating the metal contact surfaces of the moving parts in a mechanical system and a roller-screw-assembly with such a lubricating device
EP0585563A1 (en) * 1992-09-04 1994-03-09 Lean-Technik R. Janzen Device for generating a synchronous translational/rotational movement
US5638921A (en) * 1995-12-05 1997-06-17 Chrysler Corporation Die mounted unitized lubricant delivery apparatus
GB2388876A (en) * 2002-05-20 2003-11-26 Rolls Royce Plc Gear lubricant/grease retention arrangement

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB378338A (en) * 1931-11-20 1932-08-11 Georges Regnac Paille An improved trolley for electrically driven vehicles
GB779243A (en) * 1952-08-19 1957-07-17 Nat Res Dev Improvements in or relating to dry lubrication methods
GB964619A (en) * 1962-07-31 1964-07-22 James Henry Adamson Drawer runner lubricating device
GB1095160A (en) * 1964-01-27 1967-12-13 Specialties Dev Corp A ball screw and nut assembly
GB1127414A (en) * 1965-07-23 1968-09-18 Worthington Corp Self lubricating system for reciprocating compressors
GB1144768A (en) * 1966-04-12 1969-03-12 Hermsdorf Keramik Veb Improvements in or relating to the manufacture of electrical components

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB378338A (en) * 1931-11-20 1932-08-11 Georges Regnac Paille An improved trolley for electrically driven vehicles
GB779243A (en) * 1952-08-19 1957-07-17 Nat Res Dev Improvements in or relating to dry lubrication methods
GB964619A (en) * 1962-07-31 1964-07-22 James Henry Adamson Drawer runner lubricating device
GB1095160A (en) * 1964-01-27 1967-12-13 Specialties Dev Corp A ball screw and nut assembly
GB1127414A (en) * 1965-07-23 1968-09-18 Worthington Corp Self lubricating system for reciprocating compressors
GB1144768A (en) * 1966-04-12 1969-03-12 Hermsdorf Keramik Veb Improvements in or relating to the manufacture of electrical components

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0404006A1 (en) * 1989-06-23 1990-12-27 Power Components, Inc. Rack and pinion lifter
EP0551028A1 (en) * 1991-11-08 1993-07-14 Neyrpic Framatome Mecanique Method and device for lubricating the metal contact surfaces of the moving parts in a mechanical system and a roller-screw-assembly with such a lubricating device
EP0585563A1 (en) * 1992-09-04 1994-03-09 Lean-Technik R. Janzen Device for generating a synchronous translational/rotational movement
US5638921A (en) * 1995-12-05 1997-06-17 Chrysler Corporation Die mounted unitized lubricant delivery apparatus
GB2388876A (en) * 2002-05-20 2003-11-26 Rolls Royce Plc Gear lubricant/grease retention arrangement

Also Published As

Publication number Publication date
GB8306681D0 (en) 1983-04-20
GB2116646B (en) 1985-07-17

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 19980311