GB2038249A - Mounting bicycle pedal crank axles - Google Patents

Mounting bicycle pedal crank axles Download PDF

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Publication number
GB2038249A
GB2038249A GB7919071A GB7919071A GB2038249A GB 2038249 A GB2038249 A GB 2038249A GB 7919071 A GB7919071 A GB 7919071A GB 7919071 A GB7919071 A GB 7919071A GB 2038249 A GB2038249 A GB 2038249A
Authority
GB
United Kingdom
Prior art keywords
journal
ring
bearing
tubular portion
unit
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.)
Withdrawn
Application number
GB7919071A
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.)
PEROTTI OFMEGA SNC
Original Assignee
PEROTTI OFMEGA SNC
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 PEROTTI OFMEGA SNC filed Critical PEROTTI OFMEGA SNC
Publication of GB2038249A publication Critical patent/GB2038249A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K19/00—Cycle frames
    • B62K19/30—Frame parts shaped to receive other cycle parts or accessories
    • B62K19/34—Bottom brackets
    • 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
    • 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
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/06—Ball or roller bearings
    • 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
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F16C33/586—Details of specific parts of races outside the space between the races, e.g. end faces or bore of inner ring
    • 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
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/50—Positive connections
    • F16C2226/60—Positive connections with threaded parts, e.g. bolt and nut 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/20—Land vehicles
    • F16C2326/28—Bicycle propulsion, e.g. crankshaft and its support
    • 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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/067—Fixing them in a housing

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Steering Devices For Bicycles And Motorcycles (AREA)
  • Motorcycle And Bicycle Frame (AREA)

Abstract

A bicycle pedal crank axle (2) is journalled in a tubular portion (1) of the frame of the bicycle by means of two bearings (5) each having an inner ring (6) in forced association with a cylindrical neck (3) of the axle (2) and bearing against a shoulder (4) of the axle, and an outer ring (7) having a peripheral thread (7') screw engaged in an internally threaded portion (10) of the tubular portion (1). The bearings may have seals (9) and lock-nuts 11 may be screwed onto the outer rings (7). <IMAGE>

Description

SPECIFICATION Central drive unit for bicycles The present invention concerns a drive unit for bicycles and more particularly the journal assembly for the pedal arms.
As is well known, the journal of the central drive of bicycles is generally central and supported on anti-friction roller means which, hitherto, have been provided by the use of a plurality of balls each disposed and guided between a shoulder arrangement having a spherical front surface formed on the journal and a cap member screwed in the tubular portion of the frame in which said journal extends and having in turn a cavity with a spherical surface opposed to the spherical surface of said shoulder arrangement to define together the annular track or ball race for the ball bearings. The balls may be freely mounted in said track or retained by a so-called positioning cage, but in any case both the construction and the assembly of the unit are complicated and tedious and without, however, the desired assembly precision always being present.
Furthermore, such a construction requires special treatments for the journal and of the cap-like members to reduce the wear resulting from contact thereof with the ball bearings.
It is an object of the present invention to provide a central drive unit (or journal assembly for the pedal arms) of bicycles, said unit being of very simple construction and assembly and also economical, since it comprises a smaller number of components, whilst the mentioned cap-like members are eliminated.
A further object of the invention is the advantageous reduction of wear on the components, giving longer life to the unit and permitting convenient maintenance, since it makes possible easy and rapid dismantling and assembling of the journal of the unit even by any rider of the bicycle.
Afurther object is to provide a unit which is stronger and reliably efficient than hitherto arrangements as well as being of less weight relative to the above-described conventional constructions.
According to the present invention there is provided a central drive unit for bicycles, comprising a journal extending axially th rough a tubular portion connected to the frame of the bicycle and supported by rolling bearing means, said journal having two spaced apart cylindrical necks defined towards the centre of the journal by abutment shoulders; said rolling bearing means supporting the journal being constituted by two ball-bearing arrangements each having an inner ring in forced association with the corresponding cylindrical neck of said journal and bearing against said shoulder, and an outer ring having a peripheral thread screw engaged in an internally threaded portion of said tubular portion.
The invention will be described further, by way of example, with reference to the accompanying drawings, in which Figure I is a longitudinal section through the assembly and mounting of the journal of a central drive unit; and Figure 2 is a perspective view of one of the two journal bearings having an outer threaded ring.
With reference to the drawings, a bicycle has a tubular portion 1 of its frame in which a journal 2 extends and carries members of the central drive (not shown).
In accordance with the present invention, the journal 2 is provided with two cylindrical necks 3 suitably spaced apart and defined towards the centre of the journal by an abuting shoulder4. The journal is also centred and supported on two roller bearing arrangements 5 each having an inner ring 6, an outer ring 7 with a threaded outer surface 7', a plurality of balls 8 (or other rollers) on a track defined by said two rings 6, 7 and two seals (packings) 9 held between the rings themselves so as to perform part of the track of said balls 8.
On assembly, the inner ring 6 of each bearing is in force connection with the associated cylindrical neck 3 and bears against the shoulder 4 of the journal 2, whilst the other ring 7 is screwed by means of its peripheral thread 7' into an internally threaded portion 10 of the tubular portion 1.
In this arrangement, the inner ring 6 of the bearing rotates with the journal 2, whilst the outer threaded ring 7, 7' remains locked in position and hence stationary with respect to the tubular portion 1, thus ensuring correct support of said journal.
It is therefore clear how the use of previously prepared ball-bearings having the associated threaded outer ring 7, 7' makes it possible to obtain rapid and exact assembly of the journal, to reduce the number of components of the unit and to eliminate the necessity of maintenance since the bearings have a perfect seal against penetration of dust and other particles.
It should also be noted that the outer threaded ring of each bearing may be provided with an internally threaded ring 11 adapted to bear against the corresponding end of the tubular portion 1 in order to lock the bearing in the exact position.
1. A central drive unit for bicycles, comprising a journal extending axially through a tubular portion connected to the frame of the bicycle and supported by rolling bearing means, said journal having two spaced apart cylindrical necks defined towards the centre of the journal by abutment shoulders; said rolling bearing means supporting the journal being constituted by two ball-bearing arrangements each having an inner ring in forced association with the corresponding cylindrical neck of said journal and bearing against said shoulder, and an outer ring having a peripheral thread screw engaged in an internallythreaded portion of said tubular portion.
2. A unit as claimed in claim 1, in which a locking ring is screwed on the outer threaded ring of each bearing.
3. A unit as claimed in claim 1, in which the journal is supported on two ball-bearings having seals mounted at the sides of the roller bearing track of said ball and with an externally threaded outer ring.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Central drive unit for bicycles The present invention concerns a drive unit for bicycles and more particularly the journal assembly for the pedal arms. As is well known, the journal of the central drive of bicycles is generally central and supported on anti-friction roller means which, hitherto, have been provided by the use of a plurality of balls each disposed and guided between a shoulder arrangement having a spherical front surface formed on the journal and a cap member screwed in the tubular portion of the frame in which said journal extends and having in turn a cavity with a spherical surface opposed to the spherical surface of said shoulder arrangement to define together the annular track or ball race for the ball bearings. The balls may be freely mounted in said track or retained by a so-called positioning cage, but in any case both the construction and the assembly of the unit are complicated and tedious and without, however, the desired assembly precision always being present. Furthermore, such a construction requires special treatments for the journal and of the cap-like members to reduce the wear resulting from contact thereof with the ball bearings. It is an object of the present invention to provide a central drive unit (or journal assembly for the pedal arms) of bicycles, said unit being of very simple construction and assembly and also economical, since it comprises a smaller number of components, whilst the mentioned cap-like members are eliminated. A further object of the invention is the advantageous reduction of wear on the components, giving longer life to the unit and permitting convenient maintenance, since it makes possible easy and rapid dismantling and assembling of the journal of the unit even by any rider of the bicycle. Afurther object is to provide a unit which is stronger and reliably efficient than hitherto arrangements as well as being of less weight relative to the above-described conventional constructions. According to the present invention there is provided a central drive unit for bicycles, comprising a journal extending axially th rough a tubular portion connected to the frame of the bicycle and supported by rolling bearing means, said journal having two spaced apart cylindrical necks defined towards the centre of the journal by abutment shoulders; said rolling bearing means supporting the journal being constituted by two ball-bearing arrangements each having an inner ring in forced association with the corresponding cylindrical neck of said journal and bearing against said shoulder, and an outer ring having a peripheral thread screw engaged in an internally threaded portion of said tubular portion. The invention will be described further, by way of example, with reference to the accompanying drawings, in which Figure I is a longitudinal section through the assembly and mounting of the journal of a central drive unit; and Figure 2 is a perspective view of one of the two journal bearings having an outer threaded ring. With reference to the drawings, a bicycle has a tubular portion 1 of its frame in which a journal 2 extends and carries members of the central drive (not shown). In accordance with the present invention, the journal 2 is provided with two cylindrical necks 3 suitably spaced apart and defined towards the centre of the journal by an abuting shoulder4. The journal is also centred and supported on two roller bearing arrangements 5 each having an inner ring 6, an outer ring 7 with a threaded outer surface 7', a plurality of balls 8 (or other rollers) on a track defined by said two rings 6, 7 and two seals (packings) 9 held between the rings themselves so as to perform part of the track of said balls 8. On assembly, the inner ring 6 of each bearing is in force connection with the associated cylindrical neck 3 and bears against the shoulder 4 of the journal 2, whilst the other ring 7 is screwed by means of its peripheral thread 7' into an internally threaded portion 10 of the tubular portion 1. In this arrangement, the inner ring 6 of the bearing rotates with the journal 2, whilst the outer threaded ring 7, 7' remains locked in position and hence stationary with respect to the tubular portion 1, thus ensuring correct support of said journal. It is therefore clear how the use of previously prepared ball-bearings having the associated threaded outer ring 7, 7' makes it possible to obtain rapid and exact assembly of the journal, to reduce the number of components of the unit and to eliminate the necessity of maintenance since the bearings have a perfect seal against penetration of dust and other particles. It should also be noted that the outer threaded ring of each bearing may be provided with an internally threaded ring 11 adapted to bear against the corresponding end of the tubular portion 1 in order to lock the bearing in the exact position. CLAIMS
1. A central drive unit for bicycles, comprising a journal extending axially through a tubular portion connected to the frame of the bicycle and supported by rolling bearing means, said journal having two spaced apart cylindrical necks defined towards the centre of the journal by abutment shoulders; said rolling bearing means supporting the journal being constituted by two ball-bearing arrangements each having an inner ring in forced association with the corresponding cylindrical neck of said journal and bearing against said shoulder, and an outer ring having a peripheral thread screw engaged in an internallythreaded portion of said tubular portion.
2. A unit as claimed in claim 1, in which a locking ring is screwed on the outer threaded ring of each bearing.
3. A unit as claimed in claim 1, in which the journal is supported on two ball-bearings having seals mounted at the sides of the roller bearing track of said ball and with an externally threaded outer ring.
4. A journal assembly for the pedal arms of a bicycle substantially as herein described with reference to and as illustrated in the accompanying drawings.
GB7919071A 1978-12-22 1979-05-31 Mounting bicycle pedal crank axles Withdrawn GB2038249A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT05290/78A IT1103503B (en) 1978-12-22 1978-12-22 CENTRAL MOVEMENT GROUP FOR BICYCLES

Publications (1)

Publication Number Publication Date
GB2038249A true GB2038249A (en) 1980-07-23

Family

ID=11120152

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7919071A Withdrawn GB2038249A (en) 1978-12-22 1979-05-31 Mounting bicycle pedal crank axles

Country Status (6)

Country Link
DE (1) DE2918199A1 (en)
DK (1) DK238179A (en)
ES (1) ES480771A1 (en)
FR (1) FR2444843A1 (en)
GB (1) GB2038249A (en)
IT (1) IT1103503B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD410556S (en) 1997-11-17 1999-06-01 John Manufacturing Ltd. Multi function lantern
CN102062151A (en) * 2010-12-01 2011-05-18 吴江市金茂五金有限公司 Thread bearing and assembling method thereof
US20190136959A1 (en) * 2017-11-09 2019-05-09 GM Global Technology Operations LLC Locking bearing assembly
CN113719531A (en) * 2021-09-01 2021-11-30 珠海格力电器股份有限公司 Tapered roller bearing, RV reduction gear, robot

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016209361B4 (en) * 2016-05-31 2022-03-10 Schaeffler Technologies AG & Co. KG Bottom bracket for a bicycle

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB145153A (en) * 1919-03-25 1920-06-25 Louis Beaton Mcdonald Improvements in or connected with ball bearings
GB615255A (en) * 1946-05-03 1949-01-04 Jameson Aero Engines Ltd Improvements in reduction gear arrangements for the propeller drive of aircraft
FR1013184A (en) * 1950-02-23 1952-07-23 Improvements to bearing systems for cycles
FR1252564A (en) * 1960-04-02 1961-01-27 Improvements to cycle cranksets
US3903754A (en) * 1974-06-07 1975-09-09 Pino International Ltd Bicycle crank hub assembly
FR2329504A1 (en) * 1975-10-30 1977-05-27 Roulements Soc Nouvelle CRANKSET HUB FOR CYCLES

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD410556S (en) 1997-11-17 1999-06-01 John Manufacturing Ltd. Multi function lantern
CN102062151A (en) * 2010-12-01 2011-05-18 吴江市金茂五金有限公司 Thread bearing and assembling method thereof
US20190136959A1 (en) * 2017-11-09 2019-05-09 GM Global Technology Operations LLC Locking bearing assembly
CN113719531A (en) * 2021-09-01 2021-11-30 珠海格力电器股份有限公司 Tapered roller bearing, RV reduction gear, robot

Also Published As

Publication number Publication date
IT1103503B (en) 1985-10-14
IT7805290A0 (en) 1978-12-22
ES480771A1 (en) 1980-01-16
FR2444843A1 (en) 1980-07-18
DE2918199A1 (en) 1980-07-10
DK238179A (en) 1980-06-23

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)