WO2006060882A1

WO2006060882A1 - Planetary gear system

Info

Publication number: WO2006060882A1
Application number: PCT/BE2005/000178
Authority: WO
Inventors: Luc Achiel Emiel Etienne De Baets
Original assignee: De Baets Luc Achiel Emiel Etie
Priority date: 2004-12-06
Filing date: 2005-12-05
Publication date: 2006-06-15
Also published as: BE1016340A5

Abstract

Planetary system which mainly consists of a sun wheel, a planet carrier and a toothed ring which are coaxially provided around a central shaft, whereby one or several planetary gears are eccentrically bearing-mounted on the planet carrier with an external toothing which meshes with an external toothing of the sun wheel and which meshes with an internal toothing of the toothed ring, characterised in that two of the above- mentioned elements, i.e. the sun wheel (3) , the planet carrier (4), the toothed ring (5) and the planetary gears (6) are mutually bearing-mounted and are made as freewheels (11) blocked in the opposite sense.

Description

system .

The present invention concerns a planetary gear system.

More specifically, the invention concerns the use of such a system for transforming a to-and-fro movement in a rotational movement with a fixed sense of rotation.

Known planetary gear systems mainly consist of a central shaft around which a sun wheel, a toothed ring and a planet carrier with planetary gears are coaxially provided, which planetary gears are eccentrically bearing-mounted on the planet carrier with an external toothing which meshes with an external toothing of the sun wheel and which works in conjunction with an internal toothing of the toothed ring.

Such known planetary gear systems are mainly applied in transmission houses and the like.

The present invention aims a planetary gear system which makes it possible to transform a to-and-fro movement in a rotational movement with a constant sense of rotation.

To this end, the invention concerns a planetary gear system which mainly consists of a sun wheel, a planet carrier and a toothed ring which are coaxially provided around a central shaft, whereby one or several planetary gears are eccentrically bearing-mounted on the planet carrier with an external toothing which meshes with an external toothing of the sun wheel and which meshes with an internal toothing of the toothed ring, characterised in that two of the above-mentioned elements, i.e. the sun wheel, the planet carrier, the toothed ring and the planetary gears are mutually bearing-mounted and are made as freewheels blocked in the opposite sense.

In order to better explain the characteristics of the present invention, the following embodiments of a planetary gear system according to the invention are described as an example only without being limitative in any way, with reference to the accompanying figures, in which:

figure 1 represents a planetary system according to the invention; figures 2 and 3 represent sections according to line II-II, line III-III respectively in figure 1; figure 4 represents a section according to line IV- IV in figure 3.

Figures 1 to 3 represent a planetary system 1 according to the invention which mainly consists of a housing 2 in which a sun wheel 3, a planet carrier 4 and a toothed ring 5 are coaxially and rotatably provided, whereby planetary gears 6, in this case three, are eccentrically provided on the planet carrier 4 with an external toothing 7 which meshes with an external toothing 8 of the sun wheel 3 on the one hand, and with an internal toothing 9 of the toothed ring 5 on the other hand.

The above-mentioned sun wheel 3 in this case comprises a central shaft 10 which is bearing-mounted in the housing 2. The above-mentioned planet carrier 4 is provided with a central shaft 16 which is bearing-mounted in the housing 2 and which, as is represented in figure 4, is made as a freewheel 11 at its free end.

This freewheel 11 in this case consists of a disc 12 which is provided to the shaft 16 in a fixed manner and which is provided in a rotating manner in a ring 13 which is fixed in the housing 2.

The disc 12 is hereby provided with an external toothing 14 with asymmetrical teeth, whereas in the ring 13 is provided a pawl 15 which is hinge-mounted to the inside of the ring 13 and which can work in conjunction with the above-mentioned toothing 14, whereby this pawl 15 allows the disc 12 to rotate in one sense of rotation Dl and prevents it from rotating in the other sense of rotation D2, in this case clockwise.

The above-mentioned planetary gears 6 in this case consist of two gear wheels 18 and 19 with a different diameter which are coaxially fixed to each other, whereby one of the above-mentioned gear wheels 18 meshes with its external toothing 20 in the external toothing 8 of the sun wheel 3 and whereby the other gear wheel 19, with its toothing 21, works in conjunction with the internal toothing 9 of the toothed ring 5. This embodiment makes it possible to optimise the rotational movement between the different parts of the planetary system 1 as a function of the mass, diameter, etc. of the sun wheel 3, the planet .carrier 4 and the toothed ring 5.

Further, the planetary gears 6 are made as freewheels 11 which make it possible to rotate the planetary gears 6 in a sense of rotation D2 , opposite to the sense of rotation Dl in which the planet carrier 4 can be rotated, whereas the sun wheel 3 is fixed to an outgoing shaft 22.

The toothed ring 5 in this case comprises an external toothing 23 which can work in conjunction with a toothed lath 24.

According to the invention, this variant makes it possible to transform a linear to-and-fro movement of the toothed lath 24 in a rotational movement of the sun wheel 3 with a fixed sense of rotation.

The working of the above-described gear system according to the invention is simple and as follows.

When the toothed lath 24 is moved over the toothed ring 5 in a sense according to arrow F2, the toothed ring 5 is rotated in a corresponding sense of rotation D2, as a result of which the toothed ring 5 exerts a pressure on the teeth of the planetary gears 6. As the planet carrier 4 is locked in the sense of rotation D2, the planetary gears 6 will rotate around their own shaft in this sense of rotation D2, while maintaining their position in relation to the housing 2, which rotation results in a drive of the sun wheel 3 in a sense of rotation Dl.

When the toothed lath 24 is then moved in an opposite sense Fl, the sense of rotation of the toothed ring 5 is reversed, as a result of which the planetary gears 6 are stopped as their teeth are pushed in a sense of rotation Dl.

Since the planetary wheels 6 are locked in a sense of rotation Dl, the planet carrier 4 will in this case be rotated in a sense of rotation Dl, whereas the planetary wheels 6 stand still in relation to the planet carrier 4 and drive the sun wheel 3 with their toothing in a sense of rotation Dl, identical to the sense of rotation that was obtained while moving the toothed lath 24 in the opposite sense F2.

It is clear that in this last variant, the toothed ring 5 must not necessarily be driven by means of toothed lath 24, but that the drive can be realised in different manners, for example by means of a rotational to-and-fro movement.

It should be noted that the drive moreover must not necessarily mesh with the toothed ring 5, but can also be provided on the sun wheel 3, to which end the outgoing shaft 22 must be coupled to the toothed ring 5 in that case .

Finally, it should be noted that in order to transform a to-and-fro movement with a planetary system 1 according to the invention, the planetary gears and the planet carrier 4 must not necessarily be blocked.

Indeed, also blocking two elements which are directly bearing-mounted on each other in an opposite sense, i.e. the sun wheel, the planet carrier, the planetary gears and the toothed ring, makes it possible to transform a to-and-fro movement in a rotational movement with a fixed sense of rotation.

The present invention is by no means limited to the above- described embodiments represented in the figures; on the contrary, such a planetary gearwheel system 1 according to the invention can be made according to different variants while still remaining within the scope of the invention.

Claims

Claims .

1.- Planetary system which mainly consists of a sun wheel, a planet carrier and a toothed ring which are coaxially provided around a central shaft, whereby one or several planetary gears are eccentrically bearing- mounted on the planet carrier with an external toothing which meshes with an external toothing of the sun wheel and which meshes with an internal toothing of the toothed ring, characterised in that two of the above- mentioned elements, i.e. the sun wheel (3), the planet carrier (4) , the toothed ring (5) and the planetary gears (6) are mutually bearing-mounted and are made as freewheels (11) blocked in the opposite sense.

2.- Planetary system according to claim 1, characterised in that the two elements which are mutually bearing-mounted are each bearing-mounted on a separate shaft.

3.- Planetary system according to claim 1, characterised in that the planet carrier (4) and at least one of the planetary gears (6) are made as two freewheels (11) blocked in the opposite sense.

4.- Planetary system according to claim 3, characterised in that the toothed ring (5) has an external toothing (23) which can work in conjunction with the toothing of a toothed lath (24) and in that the sun wheel (3) is connected to an outgoing shaft (22) of the system (1) .

5.- Planetary system according to claim 3, characterised in that the toothed ring (5) is connected to an outgoing shaft (22) of the system (1) .

6. - The use of a planetary gear system according to claim 1 or 4 for transforming a to-and-fro movement in a rotational movement with a fixed sense of rotation.