JPH06129500A - Hub for speed change gear by planetary gear - Google Patents

Abstract

PURPOSE: To lessen the installation space by installing a plurality of sun gears, meshing with respective planet gears and a selector key on a spindle and fixing one of the sun gears by the selector key onto the spindle, so that the sun gear does not rotate. CONSTITUTION: Sun gears 41 and 42 mesh with gears 43 and 44 of a plurality of planet gears 45 mounted rotatably in a cage 46 for planet gears, and the planet gears 45 mesh with a gear ring 47. One-way clutches 48 and 49 and a manually operated selecting mechanism part 51 are installed between the cage 46 and a hub shell 50, and between the gear ring 47 and hub shell 50. One of the sun gears 41 and 42 is selectively fixed on a hub spindle 33 in such a way as to be incapable of rotation, and a select key 52 puts the selected sun gears 41, 42 in a certain drive transmission mode. The select key 52 slides freely in a slot 53 in the hub spindle 33 and meshes selectively with the sun gears 41, 42. This allows for the free use of the intra-rim space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary gearbox transmission gear hub for bicycles and the like, and more particularly to selectively mesh with each gear element of a plurality of planetary gears in a drive mode. It relates to a hub with two or more sun gears.

[0002]

2. Description of the Prior Art A hub of a five-speed transmission gear by a planetary gear device for a bicycle using a plurality of pinion gears meshing with a common gear ring is known, in which each pinion gear is in a drive mode. Selectively mesh with and cooperate with each sun gear.

In the above hub, the sun gear is rotatably and slidably mounted on the hub spindle, and when it is moved by a predetermined length in the axial direction, one sun gear or another sun gear is moved relative to the spindle. Selectively engage to form a non-rotating state. The cage of the planetary gear on the hub can be connected to the hub shell,
The drive force is transmitted from the cage of the planetary gears to the hub shell according to the state of the hub. The transmission is provided by axially movable pawls mounted on the planet gear cage and capable of cooperating with ratchet teeth formed on the end caps of the hub.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a switching device capable of selectively bringing this sun gear into a driving force transmission mode. In particular, the present invention has a simpler structure than the conventional one, requires a small space for mounting, and can more freely take space for reconfiguring the hub or changing the design of other parts. The purpose is to provide.

To achieve the above object, the present invention provides a hub spindle and a plurality of sun gears rotatably mounted adjacent to each other on the hub spindle and selectively coupled to the hub spindle in a non-rotating state. And a cage for planetary gears arranged concentrically with the hub spindle, and rotatably mounted on the cage so as to take radial positions with respect to the sun gear and drively mesh with the sun gear. A plurality of planetary gears each having a gear element, a gear ring (crown gear) disposed concentrically with the planetary gear cage and the sun gear and drivingly meshing with the plurality of planetary gears, a hub shell, and A one-way clutch acting between the cage for the planetary gear and the hub shell, and between the gear ring and the hub shell, and one of the sun gears is connected to the hub spin. A coupling device for selectively fixing the sun gear in a non-rotating state, wherein the sun gear is axially fixed to the hub spindle, and the coupling device includes the hub spindle. A selector key that is axially movable relative to each other and that is selectively engageable with each one of the sun gears to lock one of the sun gears against rotation with respect to the hub spindle. The present invention provides a transmission gear hub using a planetary gear device.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a known five-speed bicycle hub incorporating a cable operated brake. The hub has first and second sun gears (11), (12) rotatably and slidably mounted on a hub spindle (13). The sun gears (11) and (12) are planetary gear cages (1) coaxially provided on the hub spindle (13).
7) It meshes with each of the gear members (14), (15) of the plurality of planetary gears (16) held inside. A gear ring (18) is provided outside the plurality of planetary gears (16) and drivingly meshes with the plurality of planetary gears.

Further, the hub includes a planetary gear cage (1
7) and the hub shell (21), and the gear ring (1
8) and the hub shell (17) between the unidirectional clutch (1
9), (20), a drive transmission path through the planetary gears, and thus a manually operable selection mechanism for determining the gear ratio provided by the hub quite conventionally. (22) is provided.

The hub shown in FIG. 1 slides a plurality of planet gears (16) and is non-rotatably fixed to the hub spindle, ie cooperates by means of a suitable arrangement provided on the hub spindle. One of the sun gears (11), (12) is fixed to the hub spindle (13) so as to be fitted together to provide a responsive member for the plurality of planet gears (16).

More specifically, the sun gear (11) is a radial dog (do) mounted on the hub spindle (13).
gs) (24) has an axial dog (23) cooperating with it while the first sun gear (12) is a sun gear (12).
Inner teeth (2) for receiving and engaging the teeth (27) of the
6) with a collar (25). The sun gear (1) for selectively fixing to the hub spindle (13)
Axes (1), (12) are moved axially of the hub via a key (29) slidable in a slot (30) in the hub spindle and inside the sun gear (11) at a shoulder ( 31) is operated by axially adjusting a display rod (28) operated to move the sun gears (11), (12) to the outside of the hub by the return spring (32). It is performed against the restraint.

The necessary gears are fixed to the fixing devices (24) and (23).
It is apparent that the sun required to engage non-rotatably with the hub spindle (13) and to disengage unselected sun gears from the associated fixtures (27), (24). Axial movement of the gears (11), (12) is required. Space is required in the hub for the movement, and other integrated devices must limit the space available in the hub. For example,
A unidirectional clutch (19) between the planetary gear cage (17) and the hub shell (21) provides a radial paw.
ls) is not provided enough space to provide an axial pawl that acts on the hub end cap (34).

Further, the sun gear system and the device for selectively securing the sun gear system to the hub spindle include:
It is relatively complex and therefore expensive.

The object of the invention is not to provide an axially displaceable sun gear in this particular part of the hub, which can be selectively meshed with the individual fixing devices. An object of the present invention is to fix the sun gear and the hub spindle in the axial direction, and selectively fix the sun gear to the hub spindle by meshing the gears with the gears. It is proposed to be carried out by means of a selection key which is axially displaceable and which is non-rotatably fixed on the hub spindle in such a way that it locks a selected gear.

FIG. 2 shows a bicycle hub having a planetary gear type speed change gear and a cable-operated brake according to an embodiment of the present invention. The hub is free to rotate on an axis (33) and comprises a primary sun gear and auxiliary sun gears (41), (42) axially arranged with respect to the axis. The sun gears (41), (42) are drivingly meshed with the respective gears (43), (44) of a plurality of planetary gears (45) rotatably mounted in the planetary gear cage (46). On the other hand, the plurality of planetary gears (45) are drivably meshed with the gear ring (47).

Unidirectional clutches (48), (49) between the planetary gear cage (46) and the hub shell (50) and between the gear ring (47) and the hub shell (50).
And a manually operated selection mechanism (51) for determining the drive transmission path through the effective planetary gears.

One of the sun gears (41) and (42) is selectively fixed to the hub spindle (33) in a non-rotatable state, and the sun gear (4) selected in this way is
In order to put 1) and (42) into a certain drive transmission mode, the selection key (52) is set to the sun gears (41) and (4).
It is provided inside 2) in the radial direction. Select key (5
2) is free to slide into the diametrical slot (53) of the hub spindle (33), and the sun gears (41), (4)
2) extending from the hub spindle to be selectively meshed with and driven by. The hub has a selection key (52)
A return spring (55) which is fixed to the shaft and which, in operation, is located between the shaft (43) and the adjacent sleeve (56) which is screwed on the inside with the opposite surface of the selection key (52).
An adjusting device (54) for moving the selection key (52) in the axial direction of the hub spindle (33) under the control of.

As shown in detail in FIGS. 3A, 3B, 3C and 4, the selection key 52 has a hexagonal shape in plan view, and the top and bottom surfaces 57 and 58 are cylindrical surfaces. And a side surface (59) is flat. The side surfaces (60) and (61) of the selection key (52) are read / read.
Slopes (62) on both sides of the trading edge (63)
It has a tapered shape. Select key (5
The outermost surface (60) of 2) is a recess as shown by (64). The center of the recess is provided with a threaded hole (65) for receiving the threaded end of the selection rod (66) of the adjusting device (54). A groove (67) is provided at the bottom of the recess for accommodating the inner end of the return spring (55) in a valve seated manner.
It is provided coaxially with the threaded hole (5).

In FIG. 5, the main sun gear (41)
Has a splined inner surface of the gear as shown at (68) to accommodate the free end of the select key (52) but slidably in close contact. The hole for the gear is thus cruciform to provide a fit with the select key in a plurality of relative angular positions.

In FIG. 6, the auxiliary sun gear (42)
Are similarly splined. The auxiliary sun gear is flared in a conical shape with the face of the gear adjacent the main sun gear as shown at (69). As a result, the selection key (5
2) to provide clearance for the leading surface, and more particularly, to the side of the select key (42) before mating with the other spline of the sun gear (41), (42) by actuation of the adjuster (54). 59) is the sun gear (41),
(2) The fitting can be surely released from one spline.

In order to adjust the deviation of the angular arrangement between the selection key (52) and the splines of the sun gears (41), (42) to which the selection key moves, more specifically, in case of such adjustment, the deviation is caused. In order to avoid undue load on the connection of the sun gear and the select key in some cases, the auxiliary sun gear (42) is mounted as follows. That is, the auxiliary sun gear (42) resists the restraining force of the return spring (70) arranged between the auxiliary sun gear (2) and the planetary gear cage (46). It is mounted to limit axial movement of the hub in the outward direction. The return spring (70) allows the auxiliary sun gear (42) to move slightly in the axial direction, while selecting key (52) and spline (68).
Move to form a straight line so that the tapered leading end of the selection key can fit between the splines.

The selection key is dimensioned in the axial direction of the hub to avoid drivingly mating the sides of the selection key with both the main sun gear and the auxiliary sun gear at the same time. ing. The tapered end surface of the selection key, when fitted to both gears by repulsion between the tepper shape and the corresponding spline of the sun gear, provides axial movement of the selection key in the adjustment direction. It is formed to promote.

Axially disposing a freely rotatable sun gear with respect to the hub spindle and selectively fixing the sun gear to the hub spindle according to the required planetary gear train. It has now been found by the Applicant that the space in the rim for other devices integral with the hub can be freed. In the case of the hub illustrated here, the use of radially actuated pawls to transfer drive modes from the planetary gear cage to the hub shell replaces the axially actuated pawls in the prior art. You can

Further, in the embodiment of the present invention, the complicated structure necessary to provide the device for fixing the axially movable sun gear to the hub spindle of the prior art is eliminated and the structure is simplified. It can be a structure.

As described above, the present invention relates to selectively providing one of a plurality of sun gears in an effective gear train of a planetary gear type transmission gear having a plurality of planetary gears, and the selection is effectively performed. A method and apparatus for performing and selecting a selected sun gear in a drive transmission mode.

Due to the effective gear train selected, adjustments in the input or individual drive transmission path from the driver to the hub are made by methods well known in the art, and the apparatus and device for making such adjustments. The detailed description of the operating method is omitted because it is clear.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a conventionally known planetary gear device for a 5-speed hub.

FIG. 2 is a vertical cross-sectional view of the planetary gear device according to the embodiment of the present invention.

3 shows a gear selection key of the apparatus shown in FIG. 2, wherein a, b, and c are a longitudinal sectional view, a front view, and a plan view, respectively.

FIG. 4 is a schematic perspective view of the gear selection key shown in FIG.

5 is a front view of the main sun gear of the device shown in FIG. 2. FIG.

FIG. 6 is a front view of an auxiliary sun gear corresponding to FIG.

[Explanation of symbols]

 11 Sun Gear 12 Sun Gear 13 Hub Spindle 17 Planetary Gear Cage 18 Gear Ring 19 Clutch 20 Clutch 25 Color 28 Display Rod 29 Key 30 Slot 32 Return Spring 33 Hub Spindle 41 Sun Gear 42 Sun Gear 48 Clutch 49 Clutch 50 Hub Shell 52 selection key 53 slot 65 hole 68 spline

Claims (8)

[Claims] 1. A hub spindle, a plurality of sun gears rotatably mounted adjacent to each other on the hub spindle, and concentrically arranged with the sun spindle that can be selectively coupled to the hub spindle in a non-rotating state. A plurality of planetary gear cages, and a plurality of planetary gears that are rotatably mounted on the cages and each have a gear element that is radially positioned with respect to the sun gear and that drivingly meshes with the sun gear. A gear, a gear ring (crown gear) that is concentrically arranged on the planet gear cage and the sun gear, and that drivingly meshes with the plurality of planet gears, a hub shell, and between the planet gear cage and the hub shell, And a one-way clutch acting between the gear ring and the hub shell, and selectively rotating one of the sun gears relative to the hub spindle. A coupling device for fixing, the sun gear is axially fixed to the hub spindle, the coupling device is axially movable with respect to the hub spindle, A transmission gear according to a planetary gear set, characterized in that it is provided with a selector key which can be selectively engaged with each one sun gear for fixing one of the gears to the hub spindle so as not to rotate. Hub of. 2. The selector key is disposed in a slot of the hub spindle and is movable within a limited range in the axial direction of the hub spindle, the sun gear is annular, and the inner surface thereof receives the selector key. The hub according to claim 1, wherein the hub is splined so as to cooperate with each other. 3. The selector key is a lead.
A hub according to claim 1 or 2, characterized in that it is provided with inclined surfaces (chamfered portions) at both ends so as to form edges for ing) and trailing. 4. The hub according to claim 2, wherein the selector key has a flat end surface so as to engage with the slot. 5. The hub according to claim 1, wherein the hub is provided with two sun gears. 6. The hub according to claim 1, wherein at least one surface of any two adjacent sun gears facing each other is provided with a countersink-shaped portion. 7. At least one of the sun gears is movably mounted within an axially restricted range against an elastic force. Hub of. 8. The hub according to claim 1, wherein the selector key has a hexagonal shape in plan view, and an upper end surface and a lower end surface are formed by a part of a cylindrical shape. .