FR2503655A1 - TRANSMISSION HUB FOR BICYCLES OR SIMILAR VEHICLES - Google Patents

Abstract

IN A TRANSMISSION HUB FOR BICYCLETS OR SIMILAR VEHICLES, AN INPUT UNIT OF MOVEMENT 6 IS ROTATED ON AXIS 1. HUB BODY 7 IS ROTATED ON THIS UNIT BY ONE OF ITS ENDS AND ON THE HUB. AXIS AT ITS OTHER END. AN EPICYCLOIDAL TRAIN IS PROVIDED TO TRANSMIT THE MOVEMENT OF THE INPUT BODY 6 TO THE HUB BODY 7. THE CROWN 9 OF THIS TRAIN IS IN CONNECTION WITH THE INPUT BODY. A SATELLITE CARRIER 10 ROTATES AROUND AXIS 1 AND IS AXIALLY MOVABLE ON IT. A SUPPORT RING 12 MOUNTED ON THE SATELLITE CARRIER 10 MOVES AXIALLY WITH IT AND IS CINEMATICALLY LINKED PERMANENTLY WITH THE INPUT BODY. A FIRST RATCHET AND RATCHET COUPLING IS PROVIDED BETWEEN THE RING AND THE HUB BODY. A SECOND SIMILAR COUPLING IS PROVIDED BETWEEN THE SATELLITE CARRIER AND THE SAME BODY. THE FIRST COUPLING 14, 15 CAN BE SWITCHED BETWEEN A WORKING OR TORQUE TRANSMISSION POSITION AND A REST POSITION IN REACTION TO THE AXIAL DISPLACEMENT OF THE SATELLITE CARRIER.

Description

The present invention relates to a transmission hub

  for bicycle or other similar vehicle.

  A bicycle transmission hub includes

  an axe. A movement input member is mounted in a ro-

  tation by means of a first bearing on said axis, near

  of one end, or first end, thereof. Gold-

  movement input gane is provided with a plurality of pi-

  gnons for chain of transmission. A hub body in-

  turning the axis is mounted on the input member of the movement by means of a second bearing and on the axis, near the other end, or second end, of this, by means of a third bearing. An epicyclic train covered by the

  hub and by the movement input member ensures the trans-

  mission of the couple between it and the hub. The epic train

  1Q5 cycloldal includes a sun gear fixed on the axis, a holder

  satellite (s) mounted in rotation around the axis and a

  toothed crown, also mounted for rotation about the axis.

  This crown has internal teeth. At least one satellite is rotatably mounted on the planet carrier; and meshes simultaneously with the planetary and with the

internal toothing of the crown.

  A transmission hub of this type is already known

  by the description given in the patent application

vet in R.F.A. NI 29 40 841.1.

  In this known hub, a ring is provided which carries

  te a first cricket which is constantly engaged with a first ratchet on the hub body and a second pawl,

  which engages with a second ratchet on the holder

  The ratchet ring is axially displaced.

  ble to change the operating mode. In a pre-

  first axial position of the pawl ring, this is kinematically linked to the movement input member and the second pawl is disengaged from the second ratchet. The transmission of torque from the movement input member

  to the hub is therefore carried out via the ring pprte-

  pawls, the first locust and the first ratchet. In u-

  ne second axial position of the pawl ring, this

250 365-

  this is separated from the movement input member and the second pawl is engaged with the second ratchet on the

  satellite carrier (s). The couple is therefore transmitted from the organ-

  entry of the movement to the planet carrier (s) by the planetary gear train and from the planet carrier (s) to the pawl ring by the second ratchet and the second pawl, then from the pawl ring by means the first ratchet and the first ratchet and the first ratchet. Good

  that this known transmission hub has proved to be excellent

  slow both in terms of its construction and in

  concerning its operation, it has been found that it is still

  re possible to make improvements in order to

  simplify its design and assembly and thereby reduce

if the cost of its manufacture.

  To this end, in the transmission hub according to the invention, the satellite carrier (s) can be moved axially along the axis by the actuating means. A ring

  ratchet holder is rotatably mounted on the satellite carrier

  so that you can move axially with it

  this. This pawl ring is permanently linked kinematically with the movement input member. A first ratchet and ratchet coupling is provided between the ring and the hub body. A second ratchet and ratchet coupling is provided between the planet carrier (s),

  near the ring in the axial direction. The first couple

  may, in response to the axial movement of the satellite carrier

  tes (s), be switched between a state in which it transmits

the couple and a state of rest.

  It has been found that this perfect transmission hub

  particularly safe.

  In any case, the invention will be well understood from 1 '

  using the following description, with reference to the drawing

  schematic annexed, representing, by way of examples not li-

  mitatives, two embodiments of this hub: Fig. 1 is a view in partial longitudinal section

  of a transmission hub according to the invention, the train

  picycloidal being in the "normal transmission" position; Fig. 2 is a view similar to FIG. 1, with a train

  modified epicycloidal, in the position "transmission in co-

  te ". In each of these figures, the reference 1 designates the axis of the transmission hub according to the invention, which carries at one of its ends an adjustable cone 2 and at its other end a fixed cone 3. On these cones is mounted a hub body 7 provided with flanges 7a and 7b for fixing

  spokes and an input member of the movement 6, through the

  intermediate ball bearings 4 and 5. The body 7 is further mounted on said member 6 by means of a third ball bearing 8. At each of its bearings, the hub body, which is preferably in light alloy,

  is fitted with a steel bearing cup mounted for-

ce, respectively 4a and 8a.

  The input member of the movement 6 is shaped so that

  lesson to receive several pinions 6a of different diameters, capable of being selectively rotated by a

  chain of transmission, that means of changing gear

  port blow from one gable to another. On its side facing the hub body ", the input member of the movement 6

  presents a part whose shape is approximately that

  the of a bell and it is provided with an internal toothing of

  crown 9, with which the satellites mesh

  tees on a planet carrier 10 and which mesh with the teeth of a sun gear 3a formed on the cone at the same time

  fixed 3. The planet carrier 10 is rotatably mounted and a-

  xially movable on the axis, a sleeve can be

  possibly interposed. In the inner teeth of the neck

  column 9 also meshes with the external toothing 13 of a pawl-carrying ring 12, the pawls 14 of which, arranged axially close to each other, can, under the action of a spring 14a, pivot radially outwardly to engage the hub body 7, more specifically

  with a ratchet with internal teeth 15 formed on the underside

  dull of the bearing cup 8a of said body. The ring 12 is mounted in rotation, but axially immobilized on

  the hollow shaft O10a of the planet carrier 10.

  The embodiment of the transmission hub shown

  felt in Figure 1 has at the end axially

  rear of the ratchet 15 a cam 15a, by means of which the pawls 14 can be controlled in a manner which

  will be described later. On the hollow shaft 10a of the holder

  tellites 10 is mounted another set of pawls 16, which, separated from the pawls 14 by a spacer ring lob, are mounted in pockets 18 of the planet carrier so as to rotate with it and, under the action of a spring, mesh, pivoting radially outwards, with the internal toothing of a ratchet 17, formed on the face

  internal of the bearing cup 8a. The satellite carrier

  tes 10 is axially movable to the left of the figure

  re 1 on axis 1, and this, by means of a traction block, which can move to the left in an opening 21 of axis 1 and which is mounted at the end of a sliding rod 22 in the bore 25 of the axis and actuable by means of this rod by means of a chain 24t, in a traditional manner, by acting on a lever

  (not shown) against the force of a compression spring

  sion 23, which rests, on the one hand, on a rear ring

  ret 23a and, on the other, against a coa-

  xial 19 of the planet carrier 10. The internal teeth of

  crown 2 in the input member of movement 6, the den-

  planetary type 3a on the fixed cone 3 and also the den-

  Inner structure 17 in the bearing cup 8a is pro-

  run axially so that the planet gears 11, the toothing 13 and the pawls 16 are constantly engaged, while on the contrary, the pawls 14 on the ring 12 are disengaged by the cam 15a of the ratchet teeth

  formed in the bearing cup 8a when the holder

  satellites 10 is moved to the left.

  By this axial displacement of the planet carrier 10 and

  sets of pawls 14 and 16 mounted thereon

  rant on the control chain 24, the operating mode of the hub is changed. In the operating position

"503655

  "normal transmission", which is shown in FIG. 1, the torque is transmitted from the input member of the movement 6

  by the internal toothing of crown 9 to the external toothing

  lower 13 of the ring 12 and the, by the pawls 14, to the inner ratchet teeth 14 formed on the inner face of the bearing cup 8a and therefore to the hub body 7, while the pawls 16 do not not participate in the

  transmission.In the operating position "transmitted-

  side elevation ", which can be obtained by moving to the left

  che the planet carrier 10, it no longer turns empty.

  Its rotation, which is slower than that of the organ of-

  trée 6, is on the contrary transmitted by the pawls 16 to the inner ratchet teeth 17 formed in the bearing cup 8a, the pawls 14 being disengaged by the

cam 15a.

  The embodiment of the transmission hub shown

  felt in Figure 2 differs from that just described.

  written with reference to figure 1 in that for games

  ratchets 14a and 16a, an elongated ratchet is provided

  mun 15b, which is formed on the internal face of the bearing cup 8a. In addition, the disengaging cam 9a for the pawls 14a which are driven by the input member

  of movement 6 via the external teeth

  re a of the pawl ring 12 is provided here for ex-

  axially inner end of the crown teeth 9 formed on the input member of the movement, so that the pawls 14a, when the planet carrier 10 is located

  axially on the right under the action of the compression spring

  pressure 23, are disengaged from the internal ratchet teeth 15b formed on the internal face of the bowl

  bearing 8a, while the pawls 16a, which are solid

  rotating in the hollow shaft of the planet carrier by means of a ring 18a, remain engaged with

  the inner ratchet teeth 15b of the roller bowl

  ment 8a of the hub body 7, so that the latter is driven with a transmission ratio "for coast". To bring the hub into the "normal transmission" position, traction is exerted on the control chain 24 and therefore on the rod 22, which has the effect of moving the planet carrier 10 and the sets axially to the left of the figure. crickets, so that the crickets 14a driven by the input member 6 by the sole intermediary of the ring 12, are released from the disengaging cam 9a and therefore come into engagement with the ratchet teeth 15b in the hub 7 The pawls 16a on the planet carrier 10, which rotate more slowly due to the presence in

  the kinematic chain of the planetary gear, are without ef-

  effect on the transmission of torque to the hub body 7,

it spinning faster than them.

  The arrangement of the transmission hub according to the in-

  vention which has just been described considerably facilitates the manufacture and assembly of the constituent elements of the

  only use sets of pawls which act

  feels radially outward. In addition, the

  ment of this hub is favored by the fact that the toothing 13 of the pawl ring 12 cooperates with the inner gear ring 9 and remains coupled in the two operating positions: "normal transmission" and

"hill transmission".

  Thanks to the chain derailleur, which can be actuated

  re known, the pinions 6a mounted on the input member 6, make it possible to obtain a very gradual staggering of the

  transmission ratios in combination with the change

  of speeds to the hub which has just been described.

  One can also imagine an embodiment in which two sets of pawls are mounted in the body of

  hub and pivot radially inward to

  grener. In this case, the associated ratchets are provided side by side on the hollow shaft of the planet carrier and on a

  ring, respectively, said ring being mounted in rotation

  tion on the planet carrier and permanently linked kinematically with the input member. The cam is arranged on this ring so that a movement to the left

  frees pawls from direct transmission.

Claims (9)

- CLAIMS -   1.- Transmission hub for bicycles or   very similar vehicles, comprising: a) an axis (1), b) a movement input member (6) rotatably mounted on the axis (1) near the first end thereof   by means of a first bearing (5), said or-   gane being provided with a plurality of chain sprockets (6a), c) a hub body (7) surrounding the axis (1) and rotatably mounted on the input member (6) via 'a second bearing, as well as on the axis, near the second end thereof, by means of a third bearing (4), d) a planetary gear train covered by the hub body (7)   and by the input member (6), to transmit the movement   ment of the latter to said body, said train comprising a sun gear (3a) mounted in rotation about the axis (1), a planet carrier (s) (10) mounted in rotation around the axis (1 ), a ring gear mounted in rotation about the axis (1) and fixed to the input member (6), said ring being provided with an internal toothing (9), and   at least one satellite (11) rotatably mounted on the carrier   te-satellite (s) and meshing simultaneously with the sun gear (3a) and with the internal toothing (9) of the crown, e) coupling means switchable between a position   working position and a rest position for selected coupling   tively the hub body (7) with the ring gear or with the satellite carriers (10), f) actuating means (24,22,20, 23) for the means   coupling, said actuation means extend   in longitudinally in an axial bore (25) of one axis (1), characterized in that g) the planet carrier (10) is axially displaceable along the axis (1) by means of actuation S03655 (24,22,20,23),   h) a support ring (12) is mounted in rotation on the planet carrier (s) (10) so as to be able to move axially therewith, i) the support ring (12) kinematically permanently connected with the movement input member (6), j) a first ratchet and ratchet coupling (14,15) is provided between the support ring (12) and the hub body (7), k) a second coupling ratchet and ratchet (16,17) east   provided between the planet carrier (10) and the hub body   eu (7) near the support ring (12), and   1) the first coupling (14,15) which can be switched between-   be a torque transmission position and a position   rest position in reaction to the axial movement of the holder satellite (s) (10).   2.- hub according to claim 1, characterized in   that at least one of this first and this second couple-   ment (14,15; 16,17) comprises ratchet means (15, 17) turned radially inwards and fixed to the body of   hub (7) and at least one ratchet (14, 16) turned radially-   outwards, mounted on the ring (12) or on the planet carrier (10) as appropriate, and stressed so   to come into engagement with the respective ratchet (15,17).   3. A hub according to claim 1, characterized in that the first coupling comprises at least one pawl (14) pivotally mounted on one of the two elements: hub body (7) and support ring (12) and biased so as to engage with ratchet means (15) provided on 1 '   other of these elements, a cam profile (15a) for commu-   ter the pawl by contact with it being provided on a support (8a), which is axially displaceable relatively   to the pawl (14) in response to the axial movement of the holder   tellite (s) (10) along the axis (1).   4.- hub according to claim 3, characterized in that the pawl (14) is pivotally mounted on the support ring (12), the ratchet means (15) being provided on the ? EO3655   the hub body (7) and the cam profile (15a) on this   same body (7), near the ratchet means.   5. A hub according to claim 3, characterized in that the pawl (i4a) is pivotally mounted on the support ring (12), the so-called ratchet means (15b) being provided on the hub body (7), while the profile of   cam (9a) is provided on the movement input member (6.   6.- hub according to claim 2, characterized in   what the first (14a, 15b) and the second (16a, 15b) deliver   ratchet and ratchet base include ratchet means   common (15b) on the hub body.   7.- A hub according to claim 2, characterized in that internal ratchet means (15,16) are provided on a bearing insert (8a) of the second bearing (8) in the hub body (7).   8.- hub according to claim 1, characterized in   that the inner gear crown (9) is related cine-   matically permanently with the external teeth (13) of the support ring (12).   9.- hub according to claim 1, characterized in that the ring gear forms only one piece with the input organ of the movement.