Toothed-rotor shaft, toothed rotor equipped with such a shaft and rotary electrical machine equipped with such a rotor

A shaft for a claw-pole rotor, comprising:

• a front end portion with a plurality of sections, one of the sections being of radially larger size;
• a rear end portion;
• and
• an intermediate section for supporting and fixing the claw-pole rotor;
• the intermediate section having two knurled crimping areas (150, 156-250, 256) adapted to be assembled with the claw-pole rotor (2) by local deformation of the material of the claw-pole rotor (2), and a centring area (54) between the crimping areas (150, 156-250, 256) adapted to centre the claw-pole rotor and projecting radially relative to the crimping areas;
• the crimping areas (150, 156-250, 256) projecting radially relative to the section (32) of the front end portion of the shaft (3) of radially larger size;
• each crimping area (150, 156-250, 256) being separated from the centring area (54) by a separation groove (61, 62);
• at least one of the crimping areas (150, 156) including a knurled area (56, 150) with axially-oriented splines and a crimping groove (55, 51) formed on the intermediate section;
• each of the crimping areas (150, 156-250, 256) being separated from the centring area (54) by a separation groove (61, 62) formed on the intermediate section;
• the crimping groove (51, 55) and the separation groove (61, 62) being of circular section and the diameter of the bottom of the separation groove (61, 62) being greater than the diameter of the bottom of the crimping groove (51, 55).

A shaft for a claw-pole rotor, comprising:

• a front end portion with a plurality of sections, one of the sections being of radially larger size;
• a rear end portion;
• and
• an intermediate section for supporting and fixing the claw-pole rotor;
• the intermediate section having two knurled crimping areas (150, 156-250, 256) adapted to be assembled with the claw-pole rotor (2) by local deformation of the material of the claw-pole rotor (2), and a centring area (54) between the crimping areas (150, 156-250, 256) adapted to centre the claw-pole rotor and projecting radially relative to the crimping areas;
• the (150, 156-250, 256) projecting radially relative to the section (32) of the front end portion of the shaft (3) of radially larger size;
• each crimping area (150, 156-250, 256) being separated from the centring area (54) by a separation groove (61, 62);
• at least one of the crimping areas (250, 256) including a knurled area with crossed splines;
• one of the crimping areas (250) being connected to a knurled part with axially-oriented splines via a connecting groove (151).

A shaft for a claw-pole rotor, comprising:

• a front end portion with a plurality of sections one of the sections being of radially larger size;
• a rear end portion;
• and
• an intermediate section for supporting and fixing the claw-pole rotor;
• the intermediate section having two knurled crimping areas (150, 156-250, 256) adapted to be assembled with the claw-pole rotor (2) by local deformation of the material of the claw-pole rotor (2), and a centring area (54) between the crimping areas (150, 156-250, 256) adapted to centre the claw-pole rotor and projecting radially relative to the crimping areas;
• the crimping areas (150, 156-250, 256) projecting radially relative to the section (32) of the front end portion of the shaft (3) of radially larger size;
• each crimping area (150, 156-250, 256) being separated from the centring area (54) by a separation groove (61, 62);
• the centring area (54), the crimping areas (150, 156-250, 256) and the section (32) of the front end portion of the shaft (3) of radially larger size being of circular section;
• the diameter (D1) of the centring area (54) being greater than the diameter (D2) of the crimping areas (150, 156-250, 256) and the diameter (D2) of the crimping areas (150, 156-250, 256) being greater than the diameter D3) of the section (32) of the front end portion of the shaft (3) of radially larger size;
• the difference in diameter (D1-D2) between the centring area (54) and the crimping areas (150, 156-250, 256) being between 0.1 mm and 1 mm.

A claw-pole rotor in combination with a shaft supporting the claw-pole rotor so that the claw-pole rotor being fixedly secured thereon, the shaft including:

• a front end portion with a plurality of sections (31, 32), one of the sections being of radially larger size;
• a rear end portion;
• and
• an intermediate section for supporting and fixing the claw-pole rotor;
• the intermediate section having two knurled crimping areas (150, 156-250, 256) assembled with the claw-pole rotor (2) by local deformation of the material of the claw-pole rotor (2), and a centring area (54) between the crimping areas (150, 156-250, 256) centring the claw-pole rotor and projecting radially relative to the crimping areas;
• the crimping areas (150, 156-250, 256) projecting radially relative to the section (32) of the front end portion of the shaft (3) of radially larger size;
• each crimping area (150, 156-250, 256) being separated from the centring area (54) by a separation groove (61, 62);
• the centring area (54) having an axial length (L1) greater than that of each crimping area (150, 156-250, 256).

A claw-pole rotor in combination with a shaft supporting the claw-pole rotor so that the claw-pole rotor being fixedly secured thereon, the shaft including:

• a front end portion with a plurality of sections (31, 32), one of the sections being of radially larger size;
• a rear end portion;
• and
• an intermediate section for supporting and fixing the claw-pole rotor;
• the intermediate section having two knurled crimping areas (150, 156-250, 256) assembled with the claw-pole rotor (2) by local deformation of the material of the claw-pole rotor (2), and a centring area (54) between the crimping areas (150, 156-250, 256) centring the claw-pole rotor and projecting radially relative to the crimping areas;
• the crimping areas (150, 156-250, 256) projecting radially relative to the section (32) of the front end portion of the shaft (3) of radially larger size;
• the claw-pole rotor including a crimping imprint (75, 85) at each of axial ends (71, 81) thereof.

A claw-pole rotor in combination with a shaft supporting the claw-pole rotor so that the claw-pole rotor being fixedly secured thereon, the shaft including:

• a front end portion with a plurality of sections (31, 32), one of the sections being of radially larger size;
• a rear end portion;
• and
• an intermediate section for supporting and fixing the claw-pole rotor;
• the intermediate section having two knurled crimping areas (150, 156-250, 256) assembled with the claw-pole rotor (2) by local deformation of the material of the claw-pole rotor (2), and a centring area (54) between the crimping areas (150, 156-250, 256) centring the claw-pole rotor and projecting radially relative to the crimping areas;
• the crimping areas (150, 156-250, 256) projecting radially relative to the section (32) of the front end portion of the shaft (3) of radially larger size;
• each crimping area (150, 156-250, 256) being separated from the centring area (54) by a separation groove (61, 62);
• the rotor further comprising two pole wheels (7, 8) each including a flange carrying at its external periphery a plurality of teeth (9) and at its internal periphery a half-core (74, 84) and the half-cores (74, 84) being juxtaposed.

A rotary electrical machine, comprising:

• a claw-pole rotor;
• and
• a shaft supporting the claw-pole rotor so that the claw-pole rotor being fixedly secured thereon;
• the shaft including:
• a front end portion with a plurality of sections (31, 32), one of the sections being of radially larger size;
• a rear end portion;
• and
• an intermediate section for supporting and fixing the claw-pole rotor;
• the intermediate section having two knurled crimping areas (150, 156-250, 256) adapted to be assembled with the claw-pole rotor (2) by local deformation of the material of the claw-pole rotor (2), and a centring area (54) between the crimping areas (150, 156-250, 256) adapted to centre the claw-pole rotor and projecting radially relative to the crimping areas;
• the crimping areas (150, 156-250, 256) projecting radially relative to the section (32) of the front end portion of the shaft (3) of radially larger size;
• each crimping area (150, 156-250, 256) being separated from the centring area (54) by a separation groove (61, 62);
• the centring area (54) having an axial length (L1) greater than that of each crimping area (150, 156-250, 256).