The Master Model passenger car frame is known as the "Y-K" type. It consists of two strong side members, front and rear cross members, engine side support tie bar and a sub frame, tied in by strong gusset members and terminating in a braced channel member. See Fig. 233.
Fig. 233— Master Passenger Car Frame
In shape the sub frame forms a letter "Y" and the second cross member with its braces forms a letter "K", from which the frame derived its name. This frame was designed to be used in conjunction with the new Knee-Action independent front wheel suspension and consequently it imparts the proper support and rigidity exactly where the new suspension unit requires these features.
The front cross member consists of a single steel stamping drawn to a double channel section at its outer ends and a broad flat section at the center. At its ends, the front cross member, is riveted to the upper and lower flanges of the side members, as well as to the sub-frame members.
On Knee Action Models, the king pin support is bolted to the front cross member and forms a rigid support for the king pins and the wheel suspension units. The king pin support is a heavy steel channel stamping extending across the entire car from king pin to king pin. At its outer ends, inverted channel members are butt welded securely along the top edges of the support forming a complete box section which is extremely rigid. At each end a stiff angle bracket attaches the king pin support to the side member. The king pins are supported in heavy drop-forged yokes which are securely butt welded to the box sections at the ends.
The engine support tie bar is drawn to a flanged channel section and bolted to the lower flanges of the side members and the lower gusset plates. With
115the "Y-K" frame design and the five-point cushion balanced engine mounting, this engine support tie bar is relieved of much of its load, and functions principally as a transverse tie bar.
Malleable iron bumper brackets are riveted at the front end of the frame side members. The rear bumper bracket is part of the rear spring rear hanger and is riveted to the frame. The body bolt brackets are riveted to the frame at points which give maxi-mum support to the body.
Four sturdy brackets securely riveted to the side members support the rubber-covered running boards. The one-piece fender, radiator and head-lamp support is securely bolted to the front cross member and insulated from it by a cushion of rubber. This method of mounting the front fenders, radiator and headlamps is called stabilized front-end construction.
The Standard model frame is an "X" type frame. Fig. 234. It consists of two strong side members, front and rear cross members, and an "X" type sub-frame structure rigidly reinforced by strong steel gussets.
The sub-frame consists of four channel section legs which converge at the center of the frame to form the "X" from which the frame dreives its name. All four legs are securely riveted together at the center of the frame in a strong and rigid construction. The forward legs of the sub-frame telescope into the side member channels, forming the sides of the frame. Many rivets and key welds, spaced closely together, securely attach the sub-frame in the side members.
Fig. 234— Standard Passenger Car Frame
The rear legs of the sub-frame structure telescope into the side members a short distance ahead of the rear kick-up into which they extend. Here they form a strong double channel section with the side members. Many rivets through their webs and flanges securely hold them in the side members.