Gear

Patent metadata

Field	Value
Publication number	US-12264734-B2
Application number	US-202318367737-A
Country	US
Kind code	B2
Filing date	Sep 13, 2023
Priority date	Sep 16, 2022
Publication date	Apr 1, 2025
Grant date	Apr 1, 2025

Abstract

A gear has a gear body made of a first plastic material. The gear body has an axis of rotation, external toothing arranged around an axis of rotation, a centrally located receiving opening, and an intermediate portion located between the external toothing and the wall of the receiving opening. The gear body is fixedly integrally formed on a support body, which is arranged at least partially in the intermediate portion and is made of a second plastic material having a higher stiffness and lower elasticity than the first plastic material, such that surface portions of the external toothing, of the wall of the receiving opening, of the intermediate portion, and of the support body form a substantially flat end face of the gear. The external toothing is helical toothing with teeth which, at least in portions, extend at a helix angle to the axis of rotation.

First claim

The invention claimed is:

1. A gear ( 1 ) having a gear body ( 200 ) made of a first plastic material, wherein the gear body ( 200 ) has
an axis of rotation (R),
external toothing ( 210 ) arranged around an axis of rotation,
a centrally located receiving opening ( 220 ), and
an intermediate portion ( 225 ) located between the external toothing ( 210 ) and the wall ( 221 ) of the receiving opening ( 220 ),
wherein the gear body ( 200 ) is fixedly integrally formed on a support body ( 100 ), which is arranged at least partially in the intermediate portion ( 225 ) and is made of a second plastic material, which has a higher stiffness and lower elasticity than the first plastic material, such that surface portions of the external toothing ( 210 ), of the wall ( 221 ) of the receiving opening ( 220 ), of the intermediate portion ( 225 ), and of the support body ( 100 ) form a substantially flat end face of the gear ( 1 ), and wherein the support body ( 100 ) has reinforcing portions ( 120 ) for teeth ( 212 ) of the external toothing ( 210 ),
characterized by the following additional features:
the external toothing ( 210 ) is helical toothing with teeth ( 212 ) which, at least in portions, extend at a helix angle (W) to the axis of rotation (R),
at least some of the reinforcing portions ( 120 ) extend at least in portions at an angle (V) which corresponds at least approximately to the helix angle (W) of the helical toothing,
the support body ( 100 ) has an annular carrier structure ( 110 ) which is oriented perpendicularly to the axis of rotation (R) and on which the reinforcing portions ( 120 ) are located,
the annular carrier structure ( 110 ) has first projections ( 111 ) which each project in the radial direction toward a tooth ( 212 ) of the external toothing ( 210 ), and
the first projections ( 111 ) of the carrier structure ( 110 ), which each project in the radial direction toward a tooth ( 212 ) of the external toothing ( 210 ), are set back in the radial direction with respect to the maximum extent of the reinforcing portions ( 120 ).

2. The gear ( 1 ) according to claim 1 , characterized in that the second plastic material is a glass-fiber-reinforced, aramid-fiber-reinforced, or carbon-fiber-reinforced plastic material or a glass-bead or mineral-filled plastic material.

3. The gear ( 1 ) according to claim 1 , characterized in that the first plastic material is a friction-optimized plastic material or a thermoplastic.

4. The gear ( 1 ) according to claim 1 ,
characterized in that the angle (V) is smaller than the helix angle (W).

5. The gear ( 1 ) according to claim 1 ,
characterized in that the reinforcing portions ( 120 ) are set back in the axial direction with respect to the substantially flat end face.

6. The gear ( 1 ) according to claim 1 ,
characterized in that the annular carrier structure ( 110 ) has second projections ( 112 ) which are set back counter to the radial direction toward the wall ( 221 ) of the receiving opening ( 220 ).

7. The gear ( 1 ) according to claim 6 ,
characterized in that a first projection ( 111 ), which projects in the radial direction toward a tooth ( 212 ) of the external toothing ( 210 ), and a second projection ( 112 ), which is set back counter to the radial direction toward the wall ( 221 ) of the receiving opening ( 220 ), are opposite one another at each relevant point of the annular carrier structure ( 110 ).

8. The gear ( 1 ) according to claim 1 ,
characterized in that spindle-nut toothing ( 42 ) is arranged in the receiving opening ( 40 ).

9. The gear ( 1 ) according to claim 1 ,
characterized in that the gear body ( 200 ) has, on the side ( 3 ) opposite the end face formed by portions of the gear body ( 200 ) and portions of the support body ( 100 ), an extension ( 240 ) for receiving a radial and axial bearing ( 60 ).

10. The gear ( 1 ) according to claim 9 ,
characterized in that the extension ( 240 ) is formed as a circumferential ring ( 242 ) having a plurality of evenly distributed ribs ( 241 ) which are directed radially outward, an outer diameter (D 2 ) of the extension ( 240 ) being smaller than an outer diameter (D 1 ) of the external toothing ( 210 ).

11. The gear ( 1 ) according to claim 9 ,
characterized in that a circumferential, concave depression ( 218 ) is provided between the extension ( 240 ) and an axial side ( 3 ) of the gear ( 1 ), the axial side being the side nearest the extension.

12. The gear ( 1 ) according to claim 1 ,
characterized in that radially outwardly pointing end faces of the teeth ( 212 ) of the gear ( 1 ), viewed in the axial direction of the gear ( 1 ), have at least one step ( 216 ).

13. The gear ( 1 ) according to claim 1 ,
characterized in that the teeth ( 212 ) of the external toothing ( 210 ) have, viewed in the axial direction, a peripheral tooth portion ( 212 b ) which transitions from the helical toothing with the angle (W) into spur toothing with the helix angle 0°.

14. The gear ( 1 ) according to claim 1 ,
characterized in that the helix angle (W) is greater than 0° and less than about 25°.

15. A gear ( 1 ) having a gear body ( 200 ) made of a first plastic material, wherein the gear body ( 200 ) has
an axis of rotation (R),
external toothing ( 210 ) arranged around an axis of rotation,
a centrally located receiving opening ( 220 ), and
an intermediate portion ( 225 ) located between the external toothing ( 210 ) and the wall ( 221 ) of the receiving opening ( 220 ),
wherein the gear body ( 200 ) is fixedly integrally formed on a support body ( 100 ), which is arranged at least partially in the intermediate portion ( 225 ) and is made of a second plastic material, which has a higher stiffness and lower elasticity than the first plastic material, such that surface portions of the external toothing ( 210 ), of the wall ( 221 ) of the receiving opening ( 220 ), of the intermediate portion ( 225 ), and of the support body ( 100 ) form a substantially flat end face of the gear ( 1 ), and wherein the support body ( 100 ) has reinforcing portions ( 120 ) for teeth ( 212 ) of the external toothing ( 210 ),
characterized by the following additional features:
the external toothing ( 210 ) is helical toothing with teeth ( 212 ) which, at least in portions, extend at a helix angle (W) to the axis of rotation (R),
at least some of the reinforcing portions ( 120 ) extend at least in portions at an angle (V) which corresponds at least approximately to the helix angle (W) of the helical toothing, and
the relationship between the angle (V) and the helix angle (W) is given by the formula:
V =arctan(tan( W )×( r )/( d 0/2)),

where
d0/2=half the pitch diameter of the external toothing ( 10 ),
r=distance of a reference point of the reinforcing portion from the axis of rotation (R).

16. The gear ( 1 ) according to claim 15 ,
characterized in that the support body ( 100 ) has an annular carrier structure ( 110 ) which is oriented perpendicularly to the axis of rotation (R) and on which the reinforcing portions ( 120 ) are located.

17. The gear ( 1 ) according to claim 16 ,
characterized in that the annular carrier structure ( 110 ) has first projections ( 111 ) which each project in the radial direction toward a tooth ( 212 ) of the external toothing ( 210 ).

18. The gear ( 1 ) according to claim 17 ,
characterized in that the first projections ( 111 ) of the carrier structure ( 110 ), which each project in the radial direction toward a tooth ( 212 ) of the external toothing ( 210 ), are set back in the radial

Assignees

• Ims Gear Se & Co Kgaa

Inventors

• Suess Marius
• Birk Sebastian
• Knoepfle Michael
• Schachtschneider Paul
• Stoppel Eugen
• Dold Michael

Classifications

• F16H55/17 Primary

  Toothed wheels (worm wheels F16H55/22; chain wheels F16H55/30) · CPC title

• F16H2055/065

  Moulded gears, e.g. inserts therefor · CPC title

• F16H55/06 Primary

  Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties · CPC title

• F16H55/0873

  for improving axial engagement, e.g. a chamfer at the end of the tooth flank · CPC title

• F16H55/0853

  Skewed-shaft arrangement of the toothed members (F16H55/082, F16H55/0826, F16H55/0833, F16H55/084 take precedence) · CPC title