Method of manufacturing a steering column

• US 8,096,036 B2
• Filed: 08/29/2007
• Issued: 01/17/2012
• Est. Priority Date: 08/29/2007
• Status: Expired due to Fees

• Current Assignee: GM Global Technology Operations Incorporated (General Motors Company), Steering Solutions IP Holding Corporation (Nexteer Automotive Group Ltd.)
• Original Assignee: Nexteer beijing Technology Co Ltd
• Inventors: Dubay, Robert W., Witucki, David E., McDonagh, Dennis G
• Primary Examiner(s): COZART, JERMIE E
• Application Number:
  US11/897,236
• Publication Number:
  US 20090056493A1
• Time in Patent Office: 1,602 Days
• Field of Search: 294/070.9, 294/071, 294/34, 294/46, 294/47, 294/51, 294/53, 295/20, 744/92, 744/93, 280/777
• US Class Current: 29/434
• CPC Class Codes: B23P 15/00 Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
• CPC Class Codes: B62D 1/185 adjustable by axial displacement, e.g. telescopically B62D1/183, B62D1/187, B62D1/19 take precedence
• CPC Class Codes: Y10T 29/4984 Retaining clearance for motion between assembled parts
• CPC Class Codes: Y10T 29/49863 with prestressing of part
• CPC Class Codes: Y10T 29/49865 by temperature differential [e.g., shrink fit]
• CPC Class Codes: Y10T 29/49872 Confining elastic part in socket
• CPC Class Codes: Y10T 29/49934 by axially applying force
• CPC Class Codes: Y10T 29/53439 including provision to utilize thermal expansion of work

Abstract

A method of manufacturing a steering column assembly having a first jacket and a second jacket with a bushing between the first and second jackets. The method utilizes a manufacturing machine having a loadable member, a fixed member, and a thermal fixture. The method comprises the steps of: assembling the first jacket to the second jacket with the bushing located radially between the first and second jackets to interlock the first and second jackets and prevent axial movement between the first and second jackets; connecting the first jacket to the loadable member of the manufacturing machine; connecting the second jacket to a fixed member of the manufacturing machine; loading the loadable member to apply an axial force to the first jacket; heating the thermal fixture of the manufacturing machine; and melting the bushing until the first jacket moves axially relative to the second jacket.

Claims

1. A method of manufacturing a steering column assembly having a first jacket and a second jacket with a bushing between the first and second jackets utilizing a manufacturing machine having a loadable member, a fixed member, and a thermal fixture, said method comprising the steps of:

assembling the first jacket to the second jacket with the bushing located radially between the first and second jackets to interlock the first and second jackets and prevent axial movement between the first and second jackets;

connecting the first jacket to the loadable member of the manufacturing machine;

connecting the second jacket to a fixed member of the manufacturing machine;

loading the loadable member to apply an axial force to the first jacket;

heating the thermal fixture of the manufacturing machine; and

melting the bushing until the first jacket moves axially relative to the second jacket.

2. The method of manufacturing as set forth in claim 1 further comprising the step of engaging the thermal fixture directly against one of the first and second jackets during the step of melting the bushing.

3. The method of manufacturing as set forth in claim 2 further comprising the step of spacing the thermal fixture from the one of the first and second jackets after the first jacket moves axially relative to the second jacket.

4. The method of manufacturing as set forth in claim 1 further comprising the step of placing the steering column assembly in an axially extended position during the steps of connecting the jackets to the loadable and fixed members.

5. The method of manufacturing as set forth in claim 1 wherein the step of melting the bushing further includes the step of migrating the melted bushing about the first and second jackets to thermally size the bushing such that the first and second jackets are uniformly loaded during telescoping movement of the steering column assembly.

6. The method of manufacturing as set forth in claim 1 wherein the step of melting the bushing is further defined as melting the bushing directly through the second jacket.

7. The method of manufacturing as set forth in claim 1 wherein the bushing includes at least one tab and wherein the step of assembling the jackets and the bushing further includes the step of engaging the tab with the first jacket to interconnect the bushing to the first jacket.

8. The method of manufacturing as set forth in claim 7 wherein the bushing includes at least one radially projecting pad and wherein the step of assembling the jackets and the bushing further includes the step of engaging the pad with the second jacket to frictionally interconnect the bushing to the second jacket.

9. The method of manufacturing as set forth in claim 1 wherein the bushing includes at least one radially projecting pad and wherein the step of melting the bushing further includes the steps of aligning the thermal fixture with the projecting pad and melting the pad.