FR2564539A1 - BICYCLE CRANKSHAFT CRANKSHAFT BEARING. - Google Patents

Abstract

IN THIS BEARING WHICH INCLUDES A CRANKCASE COMPOSED OF TWO PARTS2, 3 SCREWED TO ONE ANOTHER AND FORMING THE EXTERIOR TRACKS10 OF THE ROTATING BEARING BODIES13, THE SIDES OF THE SHOULDERS11 OF1 AXLE4 OF THE CRANKS FORM THE INTERNAL TRACKS12. THESE TWO PARTS2 AND 3 HAVE A TUBULAR SHAPE OF WHICH THE SMALLEST DIMENSION IS LARGER THAN THE SHOULDERS11. ON AXIS4 ARE THREADS OF BEARING CAPS15, 16 WHICH OBTAIN THE RING ENCLOSURE DELIMITED BY THIS AXIS AND BY SLEEVE1 OF THE FRAME OF THE BICYCLE. THANKS TO THESE PROVISIONS, IT IS POSSIBLE THAT ONLY ONE OF THE TWO CRANKS BE FIXED REMOVABLE ON AXIS 4, THE OTHER CAN BE REMOVABLE THERE.

Description

The present invention is based on a crank bearing of

  bicycle crankset described in the

utility model DE 83 05001.

  This known bearing consists of a casing which can be inserted removably into the sleeve of the bicycle frame and which is traversed by a crankset crank shaft which has two shoulders arranged in the housing at an axial distance, one of the other and forming internal raceways to the right of which are external raceways formed in the housing. Between these inner and outer raceways are introduced bodies of

  rotating bearings, and the solid raceways

  The casings of the casing can, in order to adjust the play of this bearing, be moved axially and fixed in position, the casing being composed of two parts in the general shape of a pot whose openings face each other and which can be screwed axially. one in the

  other and whose funds crossed by the axis of

  they form, inwardly, coaxial raceways.

  This provision requires, however, that both

  levels are removably attached to the axis of the

  bearing, so that the crankcase parts can be

on this axis.

  The problem to which the invention provides a solution therefore consisted, from a crank bearings crank of the known kind described above, to make it possible, with simple means, to use this bearing with a axle having only one crank attached to it removably, the other crank forming a non-removable unit, this

  to simplify and make it cheaper

tion of the bearing assembly.

  The solution which has reached the invention is distinguished by the following characteristics: -2 - a) the flanks of the shoulders located on the axis of the cranks opposite one another form the inner raceways; b) the two housing parts have a tubular shape whose smaller inner dimension is larger than the shoulders on the axis of the cranks, the outer raceways being each formed at the free end of the screwed housing parts; one to the other, and c) on the axis of the cranks are threaded caps that close off the annular enclosure delimited between this axis

  and the frame sleeve of the bicycle.

  Thanks to these provisions it is now possible to thread together, on the axis of the cranks, the two housing parts screwed to one another, by engaging them on a

  free end of this axis, so that it is no longer

  The two cranks must be attached to the axle in a detachable manner. In addition, it is ensured of being able, after the rolling bodies have been introduced between the races, establish and possibly modify the desired clearance in the bearings, this by means of the two housing parts screwed one into the other. In addition, a sufficient seal of the bearing against projections

water is assured.

  To further reduce the manufacturing cost, it is advantageous for the casing parts which, along their entire length, have annular sections and a small wall thickness, each have at their axially outer end a flared zone whose diameter inside goes increasing towards the free end and

  whose inner wall forms an ex-

  TER AL. These housing parts can be manufactured

  from tube sections which are expanded

mity to form the flared zone.

  So that, with simple means, it can be ensured that the crank bearing will occupy a correct and secure position in the sleeve of the frame, it is provided on the one hand -3 - that a collar directed outwards and taking support against the adjacent end of the frame sleeve is arranged, in particular formed, on a housing portion following the flared zone designed to form an outer raceway, on the other hand that the flared zone of each of the parts of casing can be applied without play against the inner wall of the frame sleeve. For this, it is necessary that the outer circumference

  of this flared zone of the crankcase parts

drique.

  With regard to the bearing caps, a particularly simple and yet very effective embodiment is distinguished by the fact that the first cap has a rim which surrounds the frame sleeve, while the second cap comprises on the one hand a tubing which is engaged in the sleeve of the frame and is held there at least by friction by surrounding without clearance the flared zone of the adjacent housing part, on the other hand a flange directed outwards and bearing against the face of adjacent end of

frame sleeve.

  In this embodiment it is advantageous that the fixing of the first cap in the axial direction is ensured by placing its outer end face against a chain wheel mounted on the axis of the cranks.

  and driven in rotation by this axis.

  Although the parts of crankcase-screwed one to the.-

  can not turn themselves, we can predict

  to complete by a lock nut this screwed assembly.

  In order to exclude such unwanted rotation, a preferred embodiment which further simplifies the assembly is distinguished by the fact that in the casing portion adjacent to the chain wheel is fixedly inserted, in the direction of screwing. another housing part and following a tapping a ring of an elastically compressible material with a high coefficient of friction, in particular of synthetic material,

  and whose bore is, at least approximately,

  coaxially with the said tapping and the diameter of which

  It is smaller than the outside diameter of the threaded zone of the other housing part, so that this threaded zone frictionally penetrates into said ring. With this arrangement it is not necessary to provide a lock nut for the crankcase parts

  screwed together can not unintentionally loosen

  tively. In an embodiment promoting manufacturing, said ring has a polygonal outer periphery and is housed, without the possibility of rotation, in a zone of

  the casing part with corresponding polygonal contour.

  Furthermore, in another advantageous arrangement, provision is made to arrange in the free end face of

  one of the crankcase parts, that is to say in its opposite face

  posed at the chain wheel, key catches, in particular

  in the form of slits. So even after we have introduced

  the bearing in the sleeve of the frame and that one of the parts of the housing is pocketed to turn in this sleeve because at least one friction effect sty opposes, it is possible to correct the play of this bearing bearing in

  rotating the other part of the housing by means of a

  it is suitable for insertion into said slots

of taking.

  In order to further simplify manufacture and to reduce the cost thereof, it is advantageous that the part of the housing which is adjacent to the chain wheel and carries the ring opposing the retrorotation is formed by a deep stamping of which the axial length is less than that of the other housing part, preferably

in the ratio of 1: 4.

  In order to further increase the positioning safety

  of the bearing introduced into the sleeve of the frame, it is advan-

  tageux that the zone of] part of housing opposite to the chain wheel, flared towards its free end,

  extends beyond the adjacent end face of the man-

  The end of the frame and beyond the cap disposed at the free end of the axis of the cranks and comprises a threaded zone on which is screwed a tight nut, by

  through the said hat, against the

  mite of the sleeve adjacent to this hat. In this arrangement, a sealing ring which sealingly surrounds the axis of the cranks can be arranged on the nut, in particular a solidarity ring.

of the last.

  As a variant that may be preferable, a sealing ring that tightly surrounds the axis of the cranks is engaged in a sealed manner in the zone

  flared adjacent to it and held there by friction, is pre-

  seen at the end of said opposite axis to the chain wheel.

  Exemplary embodiments of the invention are described in detail below and with reference to the accompanying drawing; FIG. 1 is a longitudinal sectional view of a crank crank bearing, FIG. 2 is a variant of the bearing according to FIG. 1, also in longitudinal section, and FIG. in longitudinal section of a part of another embodiment of a bearing

cranks crankset.

  In all the illustrated embodiments there is shown a sleeve 1 of a bicycle frame in which is removably mounted a body or housing composed of two tubular parts 2 and 3 and traversed by an axis

  cranks 4 which at one of its extremes

  tees, has a crank crank 5 fixed irremovably. On this axis of crank 4 is mounted a

  chain wheel 6 rotated by this axis.

  The other end of the axis of cranks 4 is, in known manner, formed to receive and train

  another crank handle (not shown)

felt), this one removable.

  Part 2 of the housing has, at its end

-6 - 2564539

  turned towards the part 3 of this case, a tapping 7,

  while at the end of part 3 of the crankcase

  part 2 is provided a threaded zone 8 suitable for

  tapped 7 and screwed into the latter.

  In the exemplary embodiment shown in FIG.

  this axially adjustable screw connection could

  However, by means of a device known per se, for example by means of a counter-nut, it can be blocked for

  it does not loosen untimely.

  At each of the two tubular parts 2 and 3 at

  relatively thin king and annular section is way-

  born, at the end of these parts opposed to tapping 7

  or at the thread 8, a flared zone 9 whose inside diameter

  The interior increases as it moves away from these tapping and threading, the inner wall of this

  zone being designed to serve as an ex-

  10, while outside this zone 9 is cy-

lindrique.

  The axis of cranks 4 furthermore has two shoulder-

  11 arranged axially at a distance from each other and whose flanks facing each other serve as paths of

interior bearing 12.

  Between the tracks 10 and 12 are introduced

  of the rolling bodies 13 constituted by balls.

  The flared zone 9 of the part 2 of the bearing body ends in a flange 14 directed radially outwards and touching the adjacent end face of the flange.

  sleeve 1 of the frame of the bicycle. In addition,

  outside meter of this zone 9 of part 2 of the crankcase is calculated so that this zone is in contact

  without play with the inner wall of the sleeve 1.

  In addition two lids 15 and 16 are provided.

  on the shaft 4 cranks. The hat 15 comprising

  a shaped rim 17 which surrounds the sleeve 1 forming with it a labyrinth seal. By its axially outer face this hat 15 is supported

against the chain wheel 6.

- 7 -

  In the lid 16 came molding, in particular

  In a synthetic material, a tubing 18 in contact without play on the one hand with the inner wall of the sleeve 1, on the other hand with the outer wall of the zone 9 of the housing portion 3. This cover 16 further comprises a collar 1a molding coming touching the face of

adjacent end of the sleeve 1.

  The manufacture of the housing parts 2 and 3 is ef-

  made preferably from sections of cylindrical pipe

  which is widened at one end to form on

each of them the flared zone 9.

  The surface of the raceways 10 and 12 is quenched. To assemble the various components of the crank bearing cranking, first screw the two parts 2 and 3 of the crankcase into one another, then, after having threaded the cap 15 onto the axis 4, these parts are threaded onto this axis and we introduce the bodies

  13 between the races 10 and 12.

  To do this, the two parts of casing 2 and 3 are screwed into each other sufficiently to form between

  zones 9 and shoulders 11, sufficient spaces

  large bodies so that rolling bodies can be engaged through these spaces between

  10 and 12. The parts of the carousel are then unscrewed.

  ter 2 and 3 to separate them from each other until the desired bearing clearance is obtained. Then this

  assembly unit only has to be engaged in the man-

  chon 1 of the bicycle frame, after which the hat

16 can be put in place.

  In the case of crank arm bearings shown in FIGS. 2 and 3, zone 9 of the part of

  housing 3 extends beyond the end face of the

  chon I and has a threaded zone 20 on which is screwed a nut 21 yes, through the hat

  16, is frictionally locked against said end face.

mite of the sleeve 1.

- 2564539

  In addition, a ring 22 in synthetic course is fixed in the housing portion 2, next to the thread 7

  and coaxially to this one. This ring has a cy-

  lindrique smaller than the nominal diameter of the threaded zone 8, so that the latter is screwed frictionally in this bore, so that the threads of the threaded zone 8 elastically push the material in the ring 22, thereby preventing screwed parts

to loosen up unexpectedly.

  So that the ring 22 can not turn in the pa-

  bind, it has a polygonal outer contour and is housed with friction in a section of the zone 9

  which also has a polygonal shape.

  In this arrangement it is rational to manufacture the housing portion 2 by deep drawing from a blank. In this case, this part 2 should have an axial length as small as possible so that the cutting section to obtain the blank is as short

as possible.

  In addition, it can be provided on each of the parts

  2 and 3 a polygonal outer section for

  take vir to an operating key. In the case of

  part 2 described above, this polygo-

  nale should be provided for the right of ring 22 engaged

in this part 2.

  So that, in the case of the bottom crank bearing shown in FIG. 2 the bearing opposite the chain wheel 6 is sealed, there is provided a sealing ring 23 threaded tightly on the shaft 4 and also sealingly engaged in the flared zone 9 of the housing portion 3 in which

  this ring is held by friction.

  In the variant embodiment according to FIG. 3, the

  nut 21 forms a sealing ring 23 'which surrounds

  sealing way the axis 4 cranks- This nut 21 with

--9 -

  the sealing ring 23 'can be made of synthetic material

  so that a soft annular sealing lip can be formed along the inner circumference

of the ring.

  Alternatively, the sealing ring 23 'could be manufactured separately, and then attached to the nut 21; but

  this would result in a longer assembly time.

  The invention can also be used for bearings

  cranks in which the two cranks

  they are fixed removably on the axis 4.

  It is also possible to separately manufacture the shoulders 11 of the axis 4, then report them on

this last.

  The sleeve 1 of the frame has an internal diameter of 34mm,

  dimension that is currently customary on an in-

  ternational. The outer cylindrical range of the flared zone 9 of the housing portion 2 has an outside diameter which, with respect to this inside diameter of the sleeve 1, is adapted so that this cylindrical range can be engaged in the sleeve with a friction stopping his immobilization by friction. The remainder of the housing parts 2 and 3, including their flared zone 9,

  has an outside diameter which, relative to the inside diameter

  inside the sleeve 1, is sufficiently smaller for

  an electrical conductor supplying an artificial light

  of the bicycle passing through the frame tubes and passing through the sleeve, does not interfere with the introduction into this sleeve of the crank

  its axis 4 and can not be damaged by this bearing.

  In addition, the bottom bracket according to the invention can be correctly placed in the sleeve 1

  even when the frame tubes attached to this sleeve

  lightly, so that it is no longer necessary to remove the parts of these tubes

  protrude inside the sleeve, which is an op-

difficult and expensive.

  In addition, the bearing cranks crankset

- 10 -

  according to the invention makes it possible to perform on the one hand

  kill a careful adjustment of the bearing clearance and control the operation of the latter before it is put in place

  in the sleeve, on the other hand a possible correction-

  necessary after the ball has been run in, without

  it must be removed from the sleeve. In addition, before

  to fit this bearing in the sleeve, it can be verified that there are no residues of paint and / or solder in the sleeve, and if there are any, it is easy to remove them, because to install the bearing according to the invention in the correct position in the sleeve is sufficient

  that there is at each end of the latter a cy-

relatively short lindrique.

  - ll - 2564539 1. Crankset of bicycle cranks, consisting of a crankcase that can be removably inserted into the cedar sleeve of the bicycle and is traversed by an axle of the cranks which has two shoulders arranged in the housing at axial distance from one another and forming inner raceways, these shoulders being shaped in particular on said axis and to the right of which there are

  external raceways arranged in the car-

  ter, rotating rolling bodies being arranged in

  these inner and outer raceways, while the housing consists of two generally shaped parts of pots held in the frame sleeve.

  the bicycle and screwed coaxially one into the

  each of these two parts comprises a coaxially-shaped outer raceway, this crank bearing being identical to that which combines the following characteristics: a) the flanks of the shoulders (1-1) located on the axis;

  (4) mivelles opposite one another

  the inner races (12); b) the two casing parts (2, 3) have a tubular shape whose smaller inner dimension is greater than the shoulders (11) on the axis (4) of the cranks, the outer races (10). being each formed at the free end of the housing parts (2, 3) screwed to each other, and c) on the axis (4) of the cranks are threaded

  caps (15, 16) which seal the annular enclosure.

  lair delimited by this axis and the sleeve

(1) the frame of the bicycle.

  2. Bearing cranks according to the claim

  1, remarkable in that the crankcase parts

  (2, 3) which, throughout their entire length, have

- 12 -

  nular and with a small wall thickness, each

  at their axially outer end, an evacuation zone

  (9) whose inner diameter is increasing towards the free end and whose inner wall forms a

  outer raceway (10) ..

  3. Bearing of cranks crankset according to the

  cation 2, remarkable in that a collar (14) directed

  towards the outside and bearing against the

  of the frame sleeve (1) is arranged,

  formed on a housing part (2) as a result of

  the flared zone (9) designed to serve as a rolling path

outside (10).

  4. Bearing of crank cranks according to one

  of the preceding claims, remarkable in that

  the outer circumference of the flared zone (9) of the

  housing parts (2, 3) is cylindrical.

  5. Bearing of crank cranks according to any one

  of the preceding claims, remarkable in that

  that the first cap (15) has a flange (17) which

surrounds the frame sleeve (1).

  6. Bearing of crank cranks according to any one

  of the preceding claims, remarkable in that

  that the second cap (16) comprises on the one hand a tumbler (18) which is engaged in the frame sleeve (1), is held there at least by friction and surrounds without play the flared zone (9) of the adjacent housing part (3), on the other hand an outwardly directed flange (16) bearing against the adjacent end face of the housing

frame sleeve (1).

  30. 7. Bearing of crank cranks according to any one

  of the preceding claims, remarkable in that

  the outer end face of the first cap (15) is applied against a mounted chain wheel (6)

on the axis (4) of the cranks.

  8. Bearing of crank cranks according to any one

  of the preceding claims, remarkable in that

- 13 - 2564539

- 13 _

  than in the housing part (2) adjacent to the wheel

  chain (6) is inserted in a fixed

  screwing the other housing part (3) and to the

  after a tapping (7), a ring (22) of elastic material

  highly compressible with a high coefficient of friction, in particular of synthetic material, whose bore is at

  less approximately coaxially oriented to the said

  the inside diameter is smaller than the outside diameter of the threaded zone (8) of the other housing part (3), which zone is engaged to

friction in said ring (22).

  9. Bearing cranks according to the claim

  8, remarkable in that said ring (22)

  a polygonal outer edge and is housed without

  possibility of rotation in an area of the car-

  ter (2) corresponding polygonal contour.

  10. Crank crank bearing according to any one

  of the preceding claims, remarkable in that

  that in the free end face of one (3) of the

  crankcase elements - opposite to the chain wheel

  (6) - are provided with operating key sockets, in particular

* in the form of slits.

  11. Bearing of crank cranks according to any one

  of the preceding claims, remarkable in that

  the housing part (2) which is adjacent to -

  the chain wheel (6) and carries the ring (22) of elastically compressible material opposing the retrorotation is constituted by a deep stamping whose axial length is less than that of the other housing part (3).

  12. Bearing cranks according to the claim

  11, remarkable in that the axial lengths of the housing portion (2) adjacent to the chain wheel

  (6) and the other housing part (3) are in the

port of about 1: 4.

  13. Bearing of crank cranks according to any one

-14 _ 2564539 '

  of the preceding claims, remarkable in that

  the zone of the housing part (3) opposite to the flared (9) flared wheel (9) extending towards its free end extends beyond the adjacent end face of the frame sleeve ( 1) and beyond the cap (16) disposed at the free end of the axis (4) of the cranks and comprises a threaded zone (20) on which is screwed a nut (21) which, by the intermediate of said cap (16) is pressed against the end face of the sleeve

(1) adjacent to this hat.

  14. Bearing of cranks crankset according to

  claim 13, remarkable in that a ring of

  gap (23 ') which sealingly surrounds the axis (4) of the cranks is arranged on the nut (21), in particular

a ring integral with this nut.

  15. Bearing of cranks crankset according to one

  any of the preceding claims, remarkable

  in that a sealing ring (23) which surrounds

  the crank shaft (4) is sealingly engaged in the adjacent flared zone (9) and frictionally retained therein, is provided at the end of the said

  axis (4) opposite to the chat wheel (6).