Shaft-hub connection with toothing

• US 8,398,327 B2
• Filed: 01/30/2008
• Issued: 03/19/2013
• Est. Priority Date: 01/31/2007
• Status: Active Grant

• Current Assignee: WITTENSTEIN SE
• Original Assignee: Wittenstein AG
• Inventors: Lang, Walter, Melber, Karl-Georg, Old, Christof
• Primary Examiner(s): MACARTHUR, VICTOR L
• Application Number:
  US12/525,109
• Publication Number:
  US 20100003075A1
• Time in Patent Office: 1,875 Days
• Field of Search: 403/1, 4033591-3596, 464179-183, 295/25, 295/57, 295/58, 298/972, 295/251.1, 74/104.5
• US Class Current: 403/1
• CPC Class Codes: B23P 11/00 Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for connecting sheet metal or metal tubes, rods or profiles B21D39/00; riveting B21J; soldering, unsoldering, welding B23K; hand tools for connecting wire or strip B25B25/00; connecting metal parts by adhesives F16B11/00
• CPC Class Codes: F16D 1/06 for attachment of a member on a shaft or on a shaft-end attachment of marine propellers on shafts B63H23/34
• CPC Class Codes: F16D 1/072 involving plastic deformation plastic welding F16D1/068
• CPC Class Codes: F16H 57/0025 with gearing elements rigidly connected to a shaft, e.g. securing gears or pulleys by specially adapted splines, keys or methods
• CPC Class Codes: Y10T 29/49945 by driven force fit
• CPC Class Codes: Y10T 29/49963 Threaded fastener
• CPC Class Codes: Y10T 29/49995 Shaping one-piece blank by removing material
• CPC Class Codes: Y10T 403/10 Selectively engageable hub to shaft connection

Abstract

A method for producing a shaft-hub connection, in particular between a helically toothed pinion (2) and a hub (6), a partial section (3) of the helically toothed running toothing (4) of the pinion is used, during the connection to the hub, as a type of chip-removing cutting tool, by virtue of the partial section cutting with the profiles of its teeth into the hub in an axially aligned fashion.

Claims

1. A shaft-hub connection comprising:

a hub having a multi-step bore comprising a first step of diameter d₁ and a second step of diameter d₂ wherein diameter d₂ is greater than diameter d₁; and

a pinion having a centering bolt portion and a partial section portion, said partial section portion having a helically toothed running toothing and a circumferential cut bevel having an undercut angle, said centering bolt portion is received in the first step and the circumferential cut bevel is cut into an interior surface of the second step defining diameter d₂ to positively lock the hub to the pinion, wherein the circumferential cut bevel is undercut with respect to an end ring surface with an angle of <

15°

, a first elliptical shaped indent is provided between the partial section of the helically toothed running toothing of the pinion and the rest of the running toothing of the pinion and a second elliptical shaped indent is provided between the partial section and the centering bolt wherein the first and second indents relieve any possible notch stresses.

2. The shaft-hub connection as claimed in claim 1, wherein a diameter of a head circle of the partial section portion of the helically toothed running toothing on the pinion is slightly smaller than a diameter of the head circle of the rest of the running toothing of the pinion.

3. The shaft-hub connection as claimed in claim 1, wherein the multi-step is formed by an entry section as the first centering section, and a connecting section and a centering section as the second centering section, wherein these bore sections have different axial lengths and internal diameters of different sizes.

4. The shaft-hub connection as claimed in claim 3, wherein the entry section of the multi-step bore of the hub is shorter in axial length than the axial length of the connecting section, and has an internal diameter which corresponds to the diameter of the head circle of the partial section of the running toothing of the pinion.

5. The shaft-hub connection as claimed in claim 4, wherein the connecting section of the multi-step bore corresponds in axial length to the axial length of the partial section of the running toothing of the pinion, reduced by the axial length of the entry section of the multi-step bore.

6. The shaft-hub connection as claimed in claim 3, wherein the internal diameter of the connecting section of the multi-step bore is made slightly smaller than the diameter of the head circle of the partial section of the running toothing of the pinion.

7. The shaft-hub connection as claimed in claim 3, wherein the centering section which follows the connecting section corresponds in its dimensions to those of the centering bolt which is provided coaxially at the free end of the partial section of the helically toothed running toothing of the pinion.

8. The shaft-hub connection as claimed in claim 1, wherein the running toothing encloses a slope angle (β

) with respect to a central axis (M) of the pinion of 1°

to 30°

.

9. The shaft-hub connection as claimed in claim 1, wherein in a region of the partial section in a region of an external lateral surface, the helically toothed running toothing encloses a clearance angle (α

₁, α

₂) with respect to a lateral surface of the pinion which is in the range from −

5°

to +5°

.

10. The shaft-hub connection as claimed in claim 1, wherein the undercut angle is about 7.5°

.