MOTORIZED ARRANGEMENT FOR A DARKING ARRANGEMENT

Description

TECHNICAL FIELD

[0001] The present invention relates to a motorized assembly for a blackout system such as a roller shutter, where the motorized assembly has a motor and a reduction system where the motor shaft of the motor is mounted in a ball bearing blocked by an element of said reduction system.

[0002] The invention also relates to a blackout system comprising such a motorized assembly. PREVIOUS STATE OF THE ART

[0003] A state-of-the-art blackout system, for example a roller shutter or an awning, classically comprises a tubular motor, a winding tube driven in rotation by the tubular motor and a curtain or fabric which winds around the winding tube.

[0004] The tubular motor comprises, among other things, a motor with a drive shaft, a reduction system with an input (which is the motor shaft) and an output shaft, and a motor tube in which the motor and reduction system are housed. The motor tube is itself housed within the winding tube, which is driven in rotation by the output shaft.

[0005] The reduction system is classically made up of reduction stages made by gears which are housed in a barrel closed by two bases.

[0006] The motor shaft is mounted in a ball bearing, which is itself secured in a housing within a support piece fixed to the motor tube. The support piece is typically a molded plastic part, and therefore, a cut is provided on the housing walls to facilitate demolding. Because of this cut, the outer race of the ball bearing is not fully secured, and in the event of vibrations, the ball bearing may move, potentially causing vibrations.

[0007] Document DE-A-35 26 140 discloses a state-of-the-art motorized assembly. DESCRIPTION OF THE INVENTION

[0008] An object of the present invention is thus to propose a motorized assembly for a blackout system such as a roller shutter, where the motorized assembly has a motor and a reduction system where the motor shaft of the motor is mounted in a ball bearing which is blocked by an element of said reduction system.

[0009] For this purpose, a motorized system is proposed comprising: a coaxial motor tube with a longitudinal axis, a motor fixed in the motor tube and having a motor shaft coaxial with the longitudinal axis, a reduction system housed in the motor tube and having a coupler cooperating with the motor shaft, wherein the reduction system comprises a barrel and a base fixed to one end of the barrel around the coupler, a support piece fixed in the motor tube and having a housing with a side wall and a bottom wall where the side wall externally delimits the housing by extending around it and takes the form of a cylinder, where the bottom wall takes the form of a ring extending inside the side wall, and a ball bearing with an outer ring, an inner ring and balls between the rings, wherein the motor shaft is fitted into the inner ring,where the ball bearing is housed in the housing so that the outer ring rests against the bottom wall and is surrounded by the side wall, where the base has a rim which rests against the outer ring on the side opposite the bottom wall.

[0010] The presence of the rim helps to hold the outer ring in place.

[0011] According to a particular embodiment, the rim takes the form of a cylinder, one end face of which is in contact with the outer ring.

[0012] According to a particular embodiment, the rim takes the form of teeth distributed angularly around the longitudinal axis and which are supported against the outer ring.

[0013] The invention also proposes a blackout system comprising a curtain, a winding tube around which the curtain winds, and a motorized assembly according to one of the previous variants and housed in the winding tube, and where the reduction system comprises an output shaft which drives the winding tube in rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The features of the invention mentioned above, as well as others, will become clearer upon reading the following description of an exemplary embodiment, said description being made in relation to the accompanying drawings, among which: Fig. 1 is a perspective view of an obscuring system comprising a reducing system according to the invention, and Fig. 2 is a cross-sectional view through an axial plane of the motorized assembly according to the invention. DETAILED EXPLANATION OF IMPLEMENTATION METHODS

[0015] There Fig. 1 shows a 100 blackout system which here takes the form of a roller shutter.

[0016] The blackout system 100 includes a curtain 102, a winding tube 104 around which the curtain 102 winds, and a tubular motor 150 housed in the winding tube 104 and which includes a motor tube 152, a motor 154 and a reduction system 156.

[0017] The motor 154 and the reduction system 156 are housed permanently in the motor tube 152 which is fixedly mounted for example on the structure of a building.

[0018] The motor 154 has a drive shaft 158 ​​which rotates when the motor 154 is in operation.

[0019] The reduction system 156 includes an output shaft 160 which constitutes a power take-off intended to drive the winding tube 104 in rotation. The reduction system 156 includes a coupler which cooperates with the motor shaft 158 ​​and which is driven in rotation by the latter.

[0020] The drive shaft 158 ​​and the output shaft 160 are coaxial with a longitudinal axis X around which the various elements rotate. The drive tube 152 is also coaxial with the longitudinal axis X.

[0021] In the embodiment of the invention presented on the Fig. 1 The output shaft 160 here has a rectangular shape and the winding tube 104 includes a rectangular hole 162 which receives the output shaft 160. Thus, the rotation of the output shaft 160 causes the winding tube 104 to rotate in one direction or the other to raise or lower the curtain 102. Of course, the output shaft 160 and the hole 162 can take other shapes.

[0022] In the case of a shutter, the apron 102 classically takes the form of slats.

[0023] The 100 blackout system could take another form such as an awning and the curtain would then be made of a fabric.

[0024] There Fig. 2 shows a motorized assembly 200 according to the invention which is housed in the winding tube 104.

[0025] The motorized assembly 200 includes the motor tube 152, the motor 154 and the reduction system 156.

[0026] The reduction system 156 comprises a body, cylindrical in shape around the longitudinal axis X, which carries a coupler 204 at one end of the body for connecting to the motor shaft 158 ​​and the output shaft 160 at the other end. The body is fixed within the motor tube 152, for example, by screws or pins. The coupler 204 and the output shaft 160 are mounted to rotate relative to the body around the longitudinal axis X.

[0027] The body comprises a first base 206 around the coupler 204, a second base around the output shaft 160, and a shaft 210 fixed between the two bases 206. The various elements of the reduction system 156 are arranged inside the body. The first base 206 is thus fixed to one end of the shaft 210, and the second base is fixed to the other end of the shaft 210.

[0028] The coupler 204 is mounted to rotate freely around the longitudinal axis X inside the first base 206 and it has an input pinion coaxial with the longitudinal axis X.

[0029] The reduction system 156 conventionally comprises reduction stages, which are not described in further detail as they are not part of the invention. The input pinion meshes with the first reduction stage, which in turn meshes with the next, and so on up to the output shaft 160. The reduction stages are housed in the shaft 210 between the two bases 206.

[0030] To support and guide the motor shaft 158, the motorized assembly 200 includes a ball bearing 220 which conventionally comprises an outer ring 222, an inner ring 224 and balls 226 between the rings 222 and 224, where the rings 222 and 224 are coaxial with the longitudinal axis X. The motor shaft 158 ​​is fitted into the inner ring 224.

[0031] The motorized assembly 200 also includes a support part 228, in particular a molded part made of plastic materials, which is fixed in the motor tube 152.

[0032] The support piece 228 has a housing 230 with a side wall 232 and a bottom wall 234. The side wall 232 externally delimits the housing 230 by extending around it and is cylindrical in shape. The bottom wall 234 is crown-shaped and extends inside the side wall 232. The side wall 232 and the bottom wall 234 are coaxial with the longitudinal axis X.

[0033] The ball bearing 220 is housed in the housing 230 so that the outer ring 222 is in contact with the bottom wall 234 in a direction parallel to the longitudinal axis X and surrounded by the side wall 232.

[0034] The ball bearing 220 is placed between the motor 154 and the first base 206 and the bottom wall 234 is between the ball bearing 220 and the motor 154.

[0035] The first base 206 has a rim 240 which, when the reduction system 156 is fixed in the motor tube 152, comes to rest against the outer ring 222 on the side opposite the bottom wall 234. Thus, the rim 240 holds the outer ring 222, in particular for the purpose of controlling mechanical adjustments and vibrations.

[0036] In the embodiment of the invention presented on the Fig. 2 , the rim 240 takes the form of a cylindrical coaxial with the longitudinal axis X and whose end face is in contact with the outer ring 222, but the rim 240 can take other forms such as teeth distributed angularly around the longitudinal axis X and which are in contact with their ends against the outer ring 222.

[0037] The outer ring 222 is thus sandwiched between the bottom wall 234 and the rim 240, which ensures retention even when there is a cutout on the side wall 232.

Claims

1. Motorised unit (200) comprising: - motor tube (152) coaxial with a longitudinal axis (X), - a motor (154) secured in the motor tube (152) and having a motor shaft (158) coaxial with the longitudinal axis (X), - a stepping-down system (156) housed in the motor tube (152) and having a coupler (204) cooperating with the motor shaft (158), where the stepping-down system (156) comprises a barrel (210) and a base (206) secured at one end of the barrel (210) around the coupler (204), - a support piece (228) secured in the motor tube (152) and having a housing (230) with a lateral wall (232) and a bottom wall (234), where the lateral wall (232) externally delimits the housing (230) while extending around the latter and takes the form of a cylinder, where the bottom wall (234) takes the form of a ring that extends inside the lateral wall (232), and - a ball bearing (220) with an external raceway (222), an internal raceway (224) and balls (226) between the raceways (222, 224), where the motor shaft (158) is fitted in the internal raceway (224), where the ball bearing (220) is housed in the housing (230) so that the external raceway (222) is in abutment against the bottom wall (234) and surrounded by the lateral wall (232), where the base (206) comprises a rim (240) that is in abutment against the external raceway (222) on the side opposite to the bottom wall (234).

2. Motorised unit (200) according to claim 1, characterised in that the rim (240) takes the form of a cylinder an end face of which is in abutment against the external raceway (222).

3. Motorised unit (200) according to claim 1, characterised in that the rim (240) takes the form of teeth angularly distributed around the longitudinal axis (X) and which are in abutment against the external raceway (222).

4. Shading system (100) comprising an apron (102), a winding tube (104) around which the apron (102) winds, and a motorised unit (200) according to one of the preceding claims housed in the winding tube (104), and wherein the stepping-down system (156) comprises an output shaft (160) that rotates the winding tube (104).