Gm Global Technolgoy Operations, Inc.

David E Roberts

Michael Ralph Foster

Jack E Smith

Robert Harold Wind

John I Jalbing

William L Alley

Charles J Root

In a catalytic converter, an air tube is permanently fixed and sealed at an open end thereof between two flanges on one side of a clamshell type housing enclosing reducing and oxidizing catalyst means. The tube extends between the catalyst means and has a closed end slidably mounted between flanges of the housing on the opposite side thereof internal of where these flanges are joined. The tube which has holes for delivering air into the passing exhaust gases prior to reaching the oxidizing catalyst is thus firmly supported by the housing while relative expansion with heat is permitted therebetween and without interrupting the sealed integrity of the housing flanges at the closed end of the tube.

Catalytic converter with air tube

In a catalytic converter, a sheet metal housing has a pair of shell members enclosing a pair of sheet metal catalyst pellet beds each having an inner bed member and an outer bed member with the inner bed members also forming a plenum between the beds. At least one of the inner bed members has the area containing its perforations displaced away from that of the other inner bed member to form the plenum therebetween. A tube receiving cavity is further formed between the inner bed members that is open on opposite sides to the plenum. An air tube extends through an opening between the flanges on the outer bed member and an opening between mating peripheral flanges on the inner bed members and the housing shell members and is received in the tube receiving cavity between the inner bed members. The air tube has a closed end in the plenum and has holes spaced along the length thereof which open to the plenum to deliver air thereto. A weld external of the housing is provided between the air tube and the flanges on the outer bed members and housing shell members whereby the air tube is sealingly fixed to the outer bed members and the housing shell members but is free to expand therein and relative to the inner bed members while also maintaining the predetermined spacing in the plenum therebetween.

Catalytic converter having a pair of catalyst pellet beds with a plenum

In a catalytic converter, a sheet metal housing encloses a pair of sheet metal catalyst pellet beds each having an inner bed member and an outer bed member with the inner bed members having mating peripheral flanges and also forming a plenum between the beds. A shoulder is formed integral with and extends across each of the outer bed members and is engaged on its inner bed side by the flange on one of the inner bed members while the remaining portions of the mating flanges are received between flanges on the outer bed members. The inner bed members thus cooperate with the respective outer bed members to completely separate the pellets in the beds while relative expansion with heat is permitted between the inner bed members and the outer bed members and also between the inner bed members and the housing members.

Catalytic converter with dual catalyst pellet beds and plenum

In a catalytic converter, a sheet metal housing encloses a pair of sheet metal catalyst pellet beds and a stud extends through aligned openings in the members of the housing and both inner and outer member of each bed to reinforce these members and also maintain a certain spacing between the members of each bed. The inner bed members are self-piloted and fixed together in alignment at their respective stud openings prior to their assembly in the converter. An enlarged diameter portion is provided on the stud to maintain predetermined spacing between the inner and outer members of one of the beds and a spacer is added which cooperates with the enlarged diameter stud portion to hold the inner bed members in position while also maintaining a predetermined spacing between the members of the other bed. Then on external clamping of the housing members to the outer bed members at the stud, such clamping and spacing is permanently retained by welding the housing members to the ends of the stud.

Catalytic converter with housing-bed-plenum reinforcing and spacing means

A valve assembly in an air brake truck system which meets minimum response time specifications required by authorities and the maximum response rate required by the wheel lock control system for efficient operation. The valve assembly varies the effective orifice size between the air supply inlet and the outlet to the relay valve. The high minimum specified rate is provided for a short period of time for initial response and the lower maximum rate for efficient operation is provided for the remainder of the stop. The valve assembly has a timing section and a variable orifice section. An initially effective large orifice area is provided by moving the valve from its rest or low rate position with an initial application of control pressure, and passing control pressure through a timing orifice to counterbalance the initially applied pressure in a desired short period of time, thereby permitting the valve to return to its first position which establishes a smaller effective orifice area through which the supply pressure flows. The valve is balanced by suitable balance ports and areas so that the operating conditions of the variable orifice section do not affect the operation of the timing section.

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Flint, MI, United States of America

David E Roberts