Browse Prior Art Database

Suspension Alignment Positioning and Fastener Anti-rotation Device

IP.com Disclosure Number: IPCOM000032848D
Publication Date: 2004-Nov-15
Document File: 2 page(s) / 102K

Publishing Venue

The IP.com Prior Art Database

Abstract

In automotive suspensions, two common methods for controlling the alignment of a vehicle are a net build strategy and a trend set strategy. A common way to react torque is to use a flag or anti-rotation device attached to a nut or bolt. This allows the assembler to secure the joint without the need to react the non-driven fastener. The invention is a combination alignment positioning device and anti-rotation/self-wrenching fastener. The invention consists of a nut (or bolt), a plate that is pressed onto the fastener and a pin. The pin to fastener centerline distance serves to locate the fastener within a body/frame slot to set alignment. The pin is also used to react torque and provide a self-wrenching feature to the fastener. For service, the pin can be removed to adjust the alignment within the slot. The invention allows use of either a net build strategy (fixed distance between pin and fastener) or a trend set build strategy (multiple releases with unique distances between the pin and the fastener) with a self-wrenching feature. The combination of features saves labor time during assembly, reduces plant complexity, and achieves net build alignment variation without sacrificing serviceability.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 65% of the total text.

Suspension Alignment Positioning and Fastener Anti-rotation Device

In automotive suspensions, two common methods for controlling

the alignment of a vehicle are a net build strategy and a trend set strategy.  A common way to react torque is to use a flag or anti-rotation device attached to a nut or bolt.  This allows the assembler to secure the joint without the need to react the non-driven fastener.

A net build strategy consists of controlling the attaching holes with sufficiently tight tolerances such that the suspension alignment is built within specification without adjustment.  A net build strategy does not typically allow for adjustment in the field without a special replacement part.

A trend set strategy commonly uses shims or plates that provide an attaching hole within a slot.  Typically, multiple shims are released.  Each shim locates the hole in a different location in specific increments along the slot length.  Based on SPC data, the appropriate shim is chosen for production.  For service alignment, the shim is removed.  The presence of the shim in practice increases alignment variation due to sizing differences between the shim and vehicle structure that exceed those between a net built hole and fastener.

The invention (shown below) is a combination alignment positioning device and anti-rotation/self-wrenching fastener.  The invention consists of a nut (or bolt), a plate that is pressed onto the fastener and a pin.  The pin to fastener centerline distan...