Railroad coupler knuckle with external weight reducing features and method of forming the same
A railroad coupler knuckler meets AAR contour requirements and it includes unique external weight reducing features that strategically reduce weight without compromising strength or fatigue life. The design of the railroad knuckle of the present invention allows for formation of the knuckle through forging or coreless casting techniques and thus allows for the use of a better grade of steel compared to AAR Grade E and such forged or cast knuckle will yield much higher fatigue life compared to cast knuckles.
1. An E-type coupler knuckle comprising:
a front face configured to transmits the buff forces of the train; and
at least two external weight saving pockets with at least one intervening support ridge on the front face of the knuckle extending into the knuckle from an exterior surface of the knuckle, and wherein each external weight saving pocket is a structure that is capable of being formed in one of a forging operation or casting operation without requiring an internal core.
2. The E-type coupler knuckle according to claim 1 including at least three external weight saving pockets and wherein each weight saving pocket is formed as a substantially rectangular recesses orientated horizontally across the front face.
3. The E-type coupler knuckle according to claim 2 wherein each support ridge is substantially uniform in thickness and extends horizontally across the front face.
4. The E-type coupler knuckle according to claim 2 wherein each rectangular recesses of each pocket extends at least 70% of the width of the front face.
5. The E-type coupler knuckle according to claim 2 wherein the knuckle includes a continuous surface on the front face on the top and the bottom of the front face into which the weight saving pockets do not extend.
6. The E-type coupler knuckle according to claim 5 wherein each continuous surface has a vertical depth at least equal to the vertical depth of a pin protector.
7. The E-type coupler knuckle according to claim 5 wherein the bottom of at least one weight saving pocket is contoured around a pin hole and a flag hole of the coupler.
8. The E-type coupler knuckle according to claim 2 wherein the bottom of each one weight saving pocket is contoured around a pin hole and a flag hole of the coupler.
9. The E-type coupler knuckle according to claim 1 including at least two external weight saving pockets orientated vertically across the front face generally along the length of a pivot pin hole of the coupler.
10. The E-type coupler knuckle according to claim 9 wherein the knuckle includes a continuous surface on the front face on the top and the bottom of the front face into which the weight saving pockets do not extend.
11. The E-type coupler knuckle according to claim 9 including at least three vertical external weight saving pockets.
12. The E-type coupler knuckle according to claim 1 including at least a pair of intersecting support ridges and wherein each external weight saving pockets is formed as a substantially triangular recesses.
13. The E-type coupler knuckle according to claim 1 further including at least two external weight saving pockets with at least one intervening support ridge on a tail of the knuckle extending into the knuckle from an exterior surface of the knuckle.
14. The E-type coupler knuckle according to claim 1 further including at least two external weight saving pockets with at least one intervening support ridge on a spine of the knuckle extending into the knuckle from an exterior surface of the knuckle.
15. The E-type coupler knuckle according to claim 1 further including an external weight saving pocket on a top of a spine of the knuckle extending into the knuckle from an exterior surface of the knuckle.
16. The E-type coupler knuckle according to claim 1 further including an external weight saving pocket on a bottom of a spine of the knuckle extending into the knuckle from an exterior surface of the knuckle.
17. A method of forming an E-type coupler knuckle having a front face configured to transmits the buff forces of the train and at least two external weight saving pockets with at least one intervening support ridge on the front face of the knuckle extending into the knuckle from an exterior surface of the knuckle, comprising the step of one of forging the coupler or casting the coupler without an internal core.
18. The method of forming an E-type coupler knuckle according to claim 17 wherein at least three external weight saving pockets are formed and wherein each weight saving pocket is formed as a substantially rectangular recesses orientated horizontally across the front face.
19. The method of forming an E-type coupler knuckle according to claim 17 wherein at least two external weight saving pockets are formed orientated vertically across the front face generally along the length of a pivot pin hole of the coupler.
20. The method of forming an E-type coupler knuckle according to claim 17 further including the step of forming at least two external weight saving pockets with at least one intervening support ridge on a tail of the knuckle extending into the knuckle from an exterior surface of the knuckle.