113112
Throttle Shaft
Cummins®

The Cummins 113112 Throttle Shaft is a critical component in the engine systems of commercial trucks. It facilitates the control of engine speed and power output by regulating the flow of air into the engine. Understanding its function and significance can provide valuable insights into the performance and efficiency of truck engines.

Basic Concepts of Throttle Shafts

A throttle shaft is a mechanical component that regulates the flow of fuel and air into an engine. It operates by adjusting the position of the throttle valve, which controls the amount of air entering the engine. This regulation is essential for maintaining the desired engine speed and power output. The throttle shaft interacts with various engine components, including the accelerator pedal, to ensure smooth and responsive operation ¹.

Purpose of the 113112 Throttle Shaft

The Cummins 113112 Throttle Shaft is designed to control engine speed and power output in commercial trucks. By modulating the airflow into the engine, it allows for precise adjustments, ensuring that the engine operates efficiently under a wide range of conditions. This component is vital for maintaining the balance between fuel consumption and engine performance ².

Key Features

This Cummins part is engineered with precision to ensure optimal performance and durability. It is constructed from high-quality materials that can withstand the rigors of heavy-duty use. The design includes features such as smooth bearing surfaces and robust construction, which enhance its reliability and longevity. These attributes contribute to the overall efficiency and effectiveness of the engine system ³.

Benefits

The 113112 Throttle Shaft offers several advantages. It provides improved engine responsiveness, allowing for quicker adjustments to engine speed and power. This results in enhanced drivability and performance. Additionally, the precise control of airflow contributes to better fuel efficiency, reducing operating costs. The reliable performance of the throttle shaft under varying conditions ensures consistent engine operation.

Installation and Integration

Proper installation of the 113112 Throttle Shaft is crucial for ensuring optimal performance. It must be correctly aligned and secured within the engine system to function effectively. Compatibility with other engine components is important, and any necessary adjustments should be made to ensure smooth operation. Following manufacturer guidelines during installation will help maintain the integrity and performance of the engine system.

Troubleshooting and Maintenance

Identifying common issues with the Throttle Shaft can help in maintaining its performance. Regular inspection for signs of wear or damage is recommended. Diagnostic procedures should be followed to address any malfunctions promptly. Maintenance practices, such as cleaning and lubricating moving parts, can enhance the longevity and reliable operation of the throttle shaft.

Performance Enhancements

There are potential modifications and upgrades that can be made to the 113112 Throttle Shaft to further enhance engine performance. Aftermarket options and tuning considerations can provide additional benefits, such as improved throttle response and increased power output. These enhancements should be approached with caution to ensure compatibility and maintain the integrity of the engine system.

Cummins Corporation

Cummins Inc. is a renowned manufacturer in the automotive industry, known for its commitment to innovation and quality. With a rich history of producing reliable engine components, Cummins has established a strong reputation for excellence. The company’s dedication to advancing technology and maintaining high standards in manufacturing ensures that their products, including the 113112 Throttle Shaft, deliver exceptional performance and durability.

Role of Throttle Shaft (Part 113112) in Engine Systems

The throttle shaft (part 113112) is integral to the operation of various engine systems, facilitating precise control over the airflow into the engine. This component is a key player in the throttle body assembly, where it interacts with several other components to regulate engine performance.

Interaction with Throttle Body

The throttle shaft is centrally located within the throttle body, where it connects to the throttle plate. As the shaft rotates, it adjusts the angle of the throttle plate, thereby controlling the volume of air entering the intake manifold. This direct mechanical linkage ensures that the engine receives the appropriate amount of air for combustion, based on the driver’s input via the accelerator pedal.

Connection to Throttle Position Sensor (TPS)

The throttle shaft is also mechanically linked to the throttle position sensor (TPS). As the shaft rotates, it moves the TPS, which sends a signal to the engine control unit (ECU) indicating the position of the throttle plate. This data is essential for the ECU to make real-time adjustments to fuel delivery and ignition timing, ensuring optimal engine performance and efficiency.

Integration with Idle Air Control Valve (IACV)

In conjunction with the idle air control valve (IACV), the throttle shaft helps maintain engine idle speed. The IACV modulates the bypass air around the throttle plate, and the position of the throttle shaft influences how much air is allowed to pass through the primary intake path. This interplay is vital for stable idling, especially when the engine is under varying loads or during cold starts.

Role in Electronic Throttle Control (ETC) Systems

In modern engines equipped with electronic throttle control (ETC) systems, the throttle shaft is actuated by an electric motor rather than a cable. The ECU controls this motor based on driver input and various sensor data. The throttle shaft’s precise movement is critical for the ETC system to deliver smooth and responsive throttle transitions, enhancing both drivability and fuel economy.

Coordination with Cruise Control

When cruise control is engaged, the throttle shaft works in tandem with the cruise control actuator. This actuator adjusts the position of the throttle shaft to maintain a constant vehicle speed, ensuring a consistent airflow into the engine. The throttle shaft’s reliable operation is therefore essential for the cruise control system to function correctly.

Influence on Emissions Control

The throttle shaft also plays a part in emissions control systems. By accurately controlling airflow, it helps the engine operate within optimal parameters for reduced emissions. This is particularly important during cold starts and when the engine is under light load, conditions where emissions can be higher if not properly managed.

Conclusion

In summary, the throttle shaft (part 113112) is a fundamental component that ensures the engine receives the correct amount of air for combustion, working in harmony with various sensors and actuators to maintain engine performance, efficiency, and emissions compliance.