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USH295H - Shift fork support structure in a manual transmission - Google Patents

Shift fork support structure in a manual transmission Download PDF

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Publication number
USH295H
USH295H US06/782,172 US78217285A USH295H US H295 H USH295 H US H295H US 78217285 A US78217285 A US 78217285A US H295 H USH295 H US H295H
Authority
US
United States
Prior art keywords
shift fork
fork
fork shaft
shift
shaft
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.)
Abandoned
Application number
US06/782,172
Inventor
Akio Numazawa
Hajime Arai
Shozi Haga
Tadashi Nozaki
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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
Priority claimed from JP15846181U external-priority patent/JPS5863623U/en
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to US06/782,172 priority Critical patent/USH295H/en
Application granted granted Critical
Publication of USH295H publication Critical patent/USH295H/en
Abandoned 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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/32—Gear shift yokes, e.g. shift forks
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • 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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/32—Gear shift yokes, e.g. shift forks
    • F16H2063/321—Gear shift yokes, e.g. shift forks characterised by the interface between fork body and shift rod, e.g. fixing means, bushes, cams or pins

Definitions

  • This invention relates to a shift fork support structure in a manual transmission of such a type that a shift fork is axially slidable on a fork shaft.
  • frictional resistance during shift operation of the shift fork is greater than where both end portions of the fork shaft are slidably supported by a transmission casing. This is particularly the case where the fork shaft is slidably engaged in a pair of coaxial holes axially spaced at a fixed distance and the length of the contact between the hole peripheral surfaces and the fork shaft is less than the diameter of the fork shaft. This greater frictional resistance adversely affects the feeling of shift operation.
  • an object of the present invention is to provide a shift fork support structure which may reduce the frictional resistance between the fork shaft and the shift fork to keep the feeling of shift operation in a good condition.
  • a shift fork support structure in combination with a manual transmission of such a type that a shift fork is axially slidable on a fork shaft, comprises a bushing press-fitted into coaxial apertures formed on the shift fork and engaging the fork shaft the axial length of the bushings being equal to that of the apertures.
  • the specific feature of the invention is that the inner peripheral surface of the bushing is coated by a Teflon layer.
  • FIG. 1 is an elevational view of the shift fork of the preferred embodiment in accordance with the present invention.
  • FIG. 2 is a sectional view taken along the line II--II of FIG. 1;
  • FIG. 3 is an enlarged fragmentary section of a part of FIG. 2.
  • a shift fork 1 manufactured by press-working is formed with bent portions 1A and 1B at its opposed ends.
  • the bent portion 1A is formed with pawl members 2 engaging a clutch hub sleeve (not shown) of a transmission.
  • the bent portions 1A and 1B are formed with apertures 4 into which a fork shaft 5 is received.
  • the apertures 4 are coaxial with each other.
  • a shift head 3 is formed integrally with the bent portions 1A and 1B at the intermediate position thereof.
  • the fork shaft 5 is inserted into both the apertures 4, and the shift fork 1 is supported by the fork shaft 5 so as to axially slide on the fork shaft 5.
  • the contact length between the apertures of the shift fork and the fork shaft is smaller than the diameter of the fork shaft.
  • bushings 6 have an axial length equal to the apertures 4 and are press-fitted into both the apertures 4, so as to reduce the frictional resistance created between the inner peripheral surface of the apertures 4 and the outer peripheral surface of the fork shaft 5.
  • the bushing 6 is composed of an annular press-fitted member 7 made of metal and a polytetrafluorethylene (PTFE) layer 8 bonded onto the inner peripheral surface of the annular press-fitted member 7 by a bonding material layer 9 such as phosphor bronze.
  • PTFE polytetrafluorethylene
  • the bushing 6 is brought into press-fit with the inner peripheral surface of the apertures 4 of the shift fork 1, and the PTFE layer 8 is brought into contact with the outer peripheral surface of the fork shaft 5 in such a manner that the shift fork 1 is permitted to slide on the fork shaft 5.
  • the frictional resistance between the shift fork 1 and the fork shaft 5 may be reduced by the existence of the PTFE layer 8 of the bushing 6, thereby permitting the shift fork 1 to be smoothly operated. Accordingly, even if a shift mechanism is of such a type that the shift fork 1 is slidable relative to the fork shaft 5, the feeling of shift operation of the shift fork may be kept in a good condition.
  • the PTFE layer 8 is coated on the press-fitted member 7 of the bushing 6 by a bonding material layer, however, the method of coating the PTFE layer 8 onto the press-fitted member 7 is not restricted by this embodiment.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gear-Shifting Mechanisms (AREA)

Abstract

A shift fork support structure in a manual transmission of such a type that a shift fork is axially slidable on a fork shaft comprising a bushing press-fitted into apertures formed on the shift fork and engaging the fork shaft. The inner peripheral surface of the bushing is coated by Teflon layer. With this structure, the frictional resistance between the shift fork and the fork shaft may be reduced, thus permitting the shift fork to be smoothly operated.

Description

This application is a continuation, of application Ser. No. 06/453,904, Dec. 28, 1982 now abandoned.
BACKGROUND OF THE INVENTION
This invention relates to a shift fork support structure in a manual transmission of such a type that a shift fork is axially slidable on a fork shaft.
Where the shift fork is slidably supported on a fork shaft, frictional resistance during shift operation of the shift fork is greater than where both end portions of the fork shaft are slidably supported by a transmission casing. This is particularly the case where the fork shaft is slidably engaged in a pair of coaxial holes axially spaced at a fixed distance and the length of the contact between the hole peripheral surfaces and the fork shaft is less than the diameter of the fork shaft. This greater frictional resistance adversely affects the feeling of shift operation.
Accordingly, an object of the present invention is to provide a shift fork support structure which may reduce the frictional resistance between the fork shaft and the shift fork to keep the feeling of shift operation in a good condition.
According to the present invention, in combination with a manual transmission of such a type that a shift fork is axially slidable on a fork shaft, a shift fork support structure comprises a bushing press-fitted into coaxial apertures formed on the shift fork and engaging the fork shaft the axial length of the bushings being equal to that of the apertures. The specific feature of the invention is that the inner peripheral surface of the bushing is coated by a Teflon layer. With this structure, the frictional resistance between the shift fork and the fork shaft may be reduced, thus permitting the shift fork to be smoothly operated.
This and other objects, features and advantages of the structure according to the present invention will be more apparent from the following description when taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an elevational view of the shift fork of the preferred embodiment in accordance with the present invention;
FIG. 2 is a sectional view taken along the line II--II of FIG. 1; and
FIG. 3 is an enlarged fragmentary section of a part of FIG. 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to FIGS. 1 and 2, a shift fork 1 manufactured by press-working is formed with bent portions 1A and 1B at its opposed ends. As best seen in FIG. 2, the bent portion 1A is formed with pawl members 2 engaging a clutch hub sleeve (not shown) of a transmission. The bent portions 1A and 1B are formed with apertures 4 into which a fork shaft 5 is received. The apertures 4 are coaxial with each other. A shift head 3 is formed integrally with the bent portions 1A and 1B at the intermediate position thereof. As shown in FIG. 2, the fork shaft 5 is inserted into both the apertures 4, and the shift fork 1 is supported by the fork shaft 5 so as to axially slide on the fork shaft 5. As the shift fork must be thin enough to permit press-working, the contact length between the apertures of the shift fork and the fork shaft is smaller than the diameter of the fork shaft.
As seen in FIG. 2, bushings 6 have an axial length equal to the apertures 4 and are press-fitted into both the apertures 4, so as to reduce the frictional resistance created between the inner peripheral surface of the apertures 4 and the outer peripheral surface of the fork shaft 5. As will be apparent from FIG. 3, the bushing 6 is composed of an annular press-fitted member 7 made of metal and a polytetrafluorethylene (PTFE) layer 8 bonded onto the inner peripheral surface of the annular press-fitted member 7 by a bonding material layer 9 such as phosphor bronze. In other words, the bushing 6 is brought into press-fit with the inner peripheral surface of the apertures 4 of the shift fork 1, and the PTFE layer 8 is brought into contact with the outer peripheral surface of the fork shaft 5 in such a manner that the shift fork 1 is permitted to slide on the fork shaft 5.
With this arrangement, when the shift fork 1 is slided relative to the fork shaft 5 during the shift opration of the transmission, the frictional resistance between the shift fork 1 and the fork shaft 5 may be reduced by the existence of the PTFE layer 8 of the bushing 6, thereby permitting the shift fork 1 to be smoothly operated. Accordingly, even if a shift mechanism is of such a type that the shift fork 1 is slidable relative to the fork shaft 5, the feeling of shift operation of the shift fork may be kept in a good condition. In this embodiment, the PTFE layer 8 is coated on the press-fitted member 7 of the bushing 6 by a bonding material layer, however, the method of coating the PTFE layer 8 onto the press-fitted member 7 is not restricted by this embodiment.
While the foregoing description relates to preferred exemplary embodiment, it is to be appreciated that numerous variants and other embodiments are possible within the spirit and scope of the present invention, the scope being defined in the appended claim.

Claims (3)

What is claimed is:
1. A shift fork for an automotive vehicle manual transmission, said shift fork being axially movable relative to a fork shaft, said shift fork comprising:
a. a pair of spaced, coaxial openings for slidably receiving said fork shaft, the axial length of the peripheries of said openings being less than the diameter of said fork shaft; and
b. a bushing press-fitted in each said opening, each said bushing including a polytetrafluorethelene layer coating the inner peripheral surface thereof, said polytetrafluorethelene layer being disposed for slidable contact with said fork shaft, said bushings having axial lengths equal to said openings.
2. A shift fork as defined in claim 1, wherein said bushing further comprises an annular member made of metal which is press-fitted into said apertures and a bonding material layer which is effective to bond said polytetrafluorethlene layer onto the inner peripheral surface of said annular member.
3. A shift fork support structure as defined in claim 2, wherein said bonding material layer is made of phosphor bronze.
US06/782,172 1981-10-22 1985-10-01 Shift fork support structure in a manual transmission Abandoned USH295H (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US06/782,172 USH295H (en) 1981-10-22 1985-10-01 Shift fork support structure in a manual transmission

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP56-158461[U] 1981-10-22
JP15846181U JPS5863623U (en) 1981-10-22 1981-10-22 Shift fork support structure of manual transmission
US45390482A 1982-12-28 1982-12-28
US06/782,172 USH295H (en) 1981-10-22 1985-10-01 Shift fork support structure in a manual transmission

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US45390482A Continuation 1981-10-22 1982-12-28

Publications (1)

Publication Number Publication Date
USH295H true USH295H (en) 1987-07-07

Family

ID=26485570

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/782,172 Abandoned USH295H (en) 1981-10-22 1985-10-01 Shift fork support structure in a manual transmission

Country Status (1)

Country Link
US (1) USH295H (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5027672A (en) * 1990-11-08 1991-07-02 Chrysler Corporation Gear shift fork insert
DE4328439A1 (en) * 1993-08-24 1995-03-02 Kochendoerfer & Kiep Stanz Und Rail for accepting a selector fork
DE19816385A1 (en) * 1998-04-11 1999-10-14 Zahnradfabrik Friedrichshafen Switching device for gear change gearbox
US6318206B1 (en) * 1999-04-28 2001-11-20 INA Wälzlager Schaeffler oHG Shift rocker
US6318205B1 (en) * 1999-04-28 2001-11-20 INA Wälzlager Schaeffler oHG Locking lever for a shift rocker
US6374692B1 (en) * 1999-04-28 2002-04-23 INA Wälzlager Schaeffler oHG Shift rocker for a change-speed gearbox, and process of making a shift rocker
WO2006125494A1 (en) * 2005-05-25 2006-11-30 Schaeffler Kg Selector element
US20070209466A1 (en) * 2006-03-06 2007-09-13 Crf Societa Consortile Per Azioni Gear shift fork for a gearbox with discrete gear ratios
US20080314187A1 (en) * 2007-06-21 2008-12-25 Manfred Keller Selector for arrangement for a manual transmission in a motor vehicle
US20090107279A1 (en) * 2007-10-24 2009-04-30 C.R.F. Societa' Consortile Per Azioni Motor vehicle gearbox
US20090151496A1 (en) * 2007-12-18 2009-06-18 C.R.F. Societa' Consortile Per Azioni Motor-vehicle gearbox

Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1682999A (en) 1926-06-16 1928-09-04 Gen Motors Corp Transmission
US2669316A (en) 1945-11-05 1954-02-16 Gen Motors Corp Remote-control system for gear shifting in angularly disposed vehicle transmissions
US2691814A (en) 1952-11-24 1954-10-19 Glacier Co Ltd Polytetrafluorethylene impregnated bearings
US2809130A (en) 1956-05-18 1957-10-08 Gen Motors Corp Method of bonding a fluorinated synthetic resin to another material
US3016758A (en) 1958-11-24 1962-01-16 Gen Motors Corp Transmission control
US3080769A (en) 1961-04-17 1963-03-12 Gen Motors Corp Transmission control
GB983563A (en) 1963-04-11 1965-02-17 Vauxhall Motors Ltd Improvements relating to change-speed gear mechanisms
US3242757A (en) 1961-10-23 1966-03-29 Linde Eismasch Ag Gear-shift mechanism for motor vehicles
US3425112A (en) 1965-10-02 1969-02-04 Glyco Metall Werke Manufacture of journal bearings
US3495884A (en) 1968-01-02 1970-02-17 Texas Instruments Inc Composite material for use in bearing structures and the like
GB1183140A (en) 1968-01-08 1970-03-04 Opel Adam Ag Shift Forks for Change-Speed Gears
US3707094A (en) 1971-01-22 1972-12-26 Trw Inc Remote shift lever mechanism
US3712150A (en) 1971-08-30 1973-01-23 Ford Motor Co Compound motion transmitting linkage
US3793901A (en) 1970-10-14 1974-02-26 Porsche Kg Shifting mechanism for automatic transmissions of vehicles
US3899934A (en) 1973-02-08 1975-08-19 Peugeot Control device for a gearbox of a vehicle
US4319496A (en) 1979-01-08 1982-03-16 Nissan Motor Co., Ltd. Fork rod slidably supporting device for transfer of vehicles
US4335623A (en) 1980-03-07 1982-06-22 Mack Trucks, Inc. Transmission shift control mechanism
US4432659A (en) 1982-03-12 1984-02-21 Walbro Corporation Fuel pump armature shaft bearing
US4449416A (en) 1981-09-04 1984-05-22 J. I. Case Company Transmission control system
US4472868A (en) 1981-02-20 1984-09-25 Nissan Motor Company, Limited Method of assembling an automotive manual transmission

Patent Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1682999A (en) 1926-06-16 1928-09-04 Gen Motors Corp Transmission
US2669316A (en) 1945-11-05 1954-02-16 Gen Motors Corp Remote-control system for gear shifting in angularly disposed vehicle transmissions
US2691814A (en) 1952-11-24 1954-10-19 Glacier Co Ltd Polytetrafluorethylene impregnated bearings
US2809130A (en) 1956-05-18 1957-10-08 Gen Motors Corp Method of bonding a fluorinated synthetic resin to another material
US3016758A (en) 1958-11-24 1962-01-16 Gen Motors Corp Transmission control
US3080769A (en) 1961-04-17 1963-03-12 Gen Motors Corp Transmission control
US3242757A (en) 1961-10-23 1966-03-29 Linde Eismasch Ag Gear-shift mechanism for motor vehicles
GB983563A (en) 1963-04-11 1965-02-17 Vauxhall Motors Ltd Improvements relating to change-speed gear mechanisms
US3425112A (en) 1965-10-02 1969-02-04 Glyco Metall Werke Manufacture of journal bearings
US3495884A (en) 1968-01-02 1970-02-17 Texas Instruments Inc Composite material for use in bearing structures and the like
GB1183140A (en) 1968-01-08 1970-03-04 Opel Adam Ag Shift Forks for Change-Speed Gears
US3793901A (en) 1970-10-14 1974-02-26 Porsche Kg Shifting mechanism for automatic transmissions of vehicles
US3707094A (en) 1971-01-22 1972-12-26 Trw Inc Remote shift lever mechanism
US3712150A (en) 1971-08-30 1973-01-23 Ford Motor Co Compound motion transmitting linkage
US3899934A (en) 1973-02-08 1975-08-19 Peugeot Control device for a gearbox of a vehicle
US4319496A (en) 1979-01-08 1982-03-16 Nissan Motor Co., Ltd. Fork rod slidably supporting device for transfer of vehicles
US4335623A (en) 1980-03-07 1982-06-22 Mack Trucks, Inc. Transmission shift control mechanism
US4472868A (en) 1981-02-20 1984-09-25 Nissan Motor Company, Limited Method of assembling an automotive manual transmission
US4449416A (en) 1981-09-04 1984-05-22 J. I. Case Company Transmission control system
US4432659A (en) 1982-03-12 1984-02-21 Walbro Corporation Fuel pump armature shaft bearing

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5027672A (en) * 1990-11-08 1991-07-02 Chrysler Corporation Gear shift fork insert
DE4328439A1 (en) * 1993-08-24 1995-03-02 Kochendoerfer & Kiep Stanz Und Rail for accepting a selector fork
DE19816385A1 (en) * 1998-04-11 1999-10-14 Zahnradfabrik Friedrichshafen Switching device for gear change gearbox
US6357316B1 (en) 1998-04-11 2002-03-19 Zf Friedrichshafen Ag Shifting device for pinion gear change boxes
US6318206B1 (en) * 1999-04-28 2001-11-20 INA Wälzlager Schaeffler oHG Shift rocker
US6318205B1 (en) * 1999-04-28 2001-11-20 INA Wälzlager Schaeffler oHG Locking lever for a shift rocker
US6374692B1 (en) * 1999-04-28 2002-04-23 INA Wälzlager Schaeffler oHG Shift rocker for a change-speed gearbox, and process of making a shift rocker
DE102005024611B4 (en) * 2005-05-25 2018-02-01 Schaeffler Technologies AG & Co. KG switching element
WO2006125494A1 (en) * 2005-05-25 2006-11-30 Schaeffler Kg Selector element
US20070209466A1 (en) * 2006-03-06 2007-09-13 Crf Societa Consortile Per Azioni Gear shift fork for a gearbox with discrete gear ratios
US7788989B2 (en) * 2007-06-21 2010-09-07 Selzer Fertigungstechnik Gmbh & Co. Kg Selector fork arrangement for a manual transmission in a motor vehicle
US20080314187A1 (en) * 2007-06-21 2008-12-25 Manfred Keller Selector for arrangement for a manual transmission in a motor vehicle
US20090107279A1 (en) * 2007-10-24 2009-04-30 C.R.F. Societa' Consortile Per Azioni Motor vehicle gearbox
US8413537B2 (en) * 2007-10-24 2013-04-09 C.R.F. Societa Consortile Per Azioni Motor vehicle gearbox
US20090151496A1 (en) * 2007-12-18 2009-06-18 C.R.F. Societa' Consortile Per Azioni Motor-vehicle gearbox
US8397598B2 (en) * 2007-12-18 2013-03-19 C.R.F. Societa Consortile Per Azioni Motor-vehicle gearbox

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