Crankshaft nose end design

1 . A vehicle comprising:

an engine configured to produce a linear motion output;

a crankshaft configured to convert the linear motion output to rotational motion and terminating at an end with a tapered exterior surface extending to a central surface;

an annular ring having a proximal ring surface, a distal ring surface, a ring opening, and a tapered inner surface, wherein the end of the crankshaft is received in the ring opening;

a friction shim located between the tapered exterior surface and the tapered inner surface; and

a fastener fixed to the crankshaft and holding the annular ring against the tapered exterior surface.

2 . The vehicle of claim 1 , wherein:

the crankshaft is formed with a cavity in the central surface;

the fastener includes an abutment surface and an extension extending from the abutment surface; and

the extension is received in and engaged with the cavity of the central surface.

3 . The vehicle of claim 1 , wherein:

the crankshaft extends along an axis;

the crankshaft is formed with a cavity in the central surface extending along the axis to a cavity bottom;

the cavity bottom defines a cavity plane perpendicular to the axis; and

the cavity plane is located between the proximal ring surface and the distal ring surface.

4 . The vehicle of claim 1 , wherein:

the crankshaft further comprises an annular shoulder extending radially outward from the tapered exterior surface; and

the annular shoulder is distanced from the proximal ring surface by a gap.

5 . The vehicle of claim 1 , wherein the tapered exterior surface is formed with an angle of from 2 degrees to 60 degrees.

6 . The vehicle of claim 1 , wherein:

the crankshaft is formed with a cavity in the central surface;

the proximal ring surface is distanced from the distal ring surface by a ring length;

the fastener includes an abutment surface and an extension extending from the abutment surface to an extension end;

the extension end is distanced from the abutment surface by an extension length;

the extension is received in and engaged with the cavity of the central surface; and

the extension length is less than the ring length.

7 . The vehicle of claim 1 , wherein:

at the proximal ring surface, the ring opening has a first diameter;

the central surface has a second diameter; and

the first diameter is at least 1.2 times the second diameter.

8 . The vehicle of claim 1 , wherein:

at the proximal ring surface, the ring opening has a first diameter;

the central surface has a second diameter; and

the first diameter is at least 1.5 times the second diameter.

9 . The vehicle of claim 1 , wherein at least a portion of the tapered exterior surface and/or the tapered inner surface is laser-treated to form a hardened rough surface region.

10 . The vehicle of claim 1 , wherein the friction shim comprises a metal layer coated with a diamond dust slurry.

11 . A crankshaft assembly for a vehicle, the crankshaft assembly comprising:

a crankshaft comprising a shaft portion with a shaft end and comprising a nose portion located at the shaft end and having a distal nose surface formed with a cavity, and wherein the nose portion has a conical exterior surface increasing in diameter in a proximal direction from the distal nose surface;

an annular ring having a proximal ring surface, a distal ring surface, a ring opening, and a conical inner surface, wherein the ring opening extends from the proximal ring surface to the distal ring surface, wherein the ring opening is defined by the conical inner surface, and wherein the conical inner surface is configured for receiving the conical exterior surface of the nose portion;

a friction shim configured to be compressed between the conical exterior surface and the conical inner surface; and

a connection element having a proximal abutment surface and an extension extending in the proximal direction from the proximal abutment surface, wherein the extension is configured to be received and secured in the cavity of the nose portion to compress the annular ring between the conical exterior surface of the nose portion and the proximal abutment surface of the connection element.

12 . The crankshaft assembly of claim 11 , wherein the crankshaft further comprises an annular shoulder joining the conical exterior surface; wherein the annular shoulder has a distal shoulder surface configured to be distanced from the proximal ring surface by a gap when the annular ring is compressed between the conical exterior surface of the nose portion and the proximal abutment surface of the connection element.

13 . The crankshaft assembly of claim 11 , wherein the conical exterior surface is formed with an angle of from 2 degrees to 60 degrees.

14 . The crankshaft assembly of claim 11 , wherein the conical exterior surface is formed with a first angle and the conical inner surface is formed with a second angle equal to the first angle.

15 . The crankshaft assembly of claim 11 , wherein:

the proximal ring surface is distanced from the distal ring surface by a ring length;

the extension extends from the proximal abutment surface to an extension end;

the extension end is distanced from the proximal abutment surface by an extension length; and

the extension length is less than the ring length.

16 . The crankshaft assembly of claim 11 , wherein:

at the proximal ring surface, the ring opening has a first diameter;

at the distal nose surface, the nose portion has a second diameter; and

the first diameter is at least 1.5 times the second diameter.

17 . The crankshaft assembly of claim 11 , wherein at least a portion of the conical exterior surface and/or the conical inner surface is laser-treated to form a hardened rough surface region.

18 . The crankshaft assembly of claim 11 , wherein the friction shim comprises a metal layer coated with a diamond dust slurry.

19 . A method for connecting a vehicle accessory component to a crankshaft, the method comprising:

locating a friction shim on a tapered exterior surface at an end of the crankshaft;

locating an end of the crankshaft in an opening of the vehicle accessory component, wherein the tapered exterior surface extends to a central surface formed with a cavity, and wherein the vehicle accessory component has a proximal surface, a distal surface, and a tapered inner surface defining the opening;

inserting an extension of a fastener in the cavity, wherein the fastener has an abutment surface; and

tightening the fastener to contact the distal surface of the vehicle accessory component and force the vehicle accessory component toward the tapered exterior surface, wherein tightening the fastener comprises compressing the friction shim between the tapered exterior surface and the tapered inner surface.

20 . The method of claim 19 , wherein at least a portion of the tapered exterior surface and/or the tapered inner surface is laser-treated and has a hardened rough surface region.