General Information
Model Numbers: 334 - 9968 and 3349968
Applicable Equipment: Caterpillar 320C, E320C, and E320D
Function: The swing motor, along with the associated hydraulic gearbox, is a critical component that provides the rotational force necessary to swing the upper structure of the excavator. This enables the excavator to change the direction of its digging and loading operations effectively.
2. Performance Specifications
2.1 Torque Output
Rated Torque: The swing motor is designed to provide a rated torque of [X] Nm (Newton - meters). This torque value is essential for smoothly and efficiently swinging the excavator's upper structure, even under load. It determines the ability of the motor - gearbox combination to handle the inertia and resistance during the swing operation.
Peak Torque: The system can generate a peak torque of [Y] Nm for short - term, high - load situations such as sudden stops or starts of the swing motion. The peak torque capacity allows the motor and gearbox to handle unexpected loads without stalling or causing damage to the components.
2.2 Speed Ratings
Rated Speed: The rated rotational speed of the swing motor is [N1] revolutions per minute (rpm). This speed is optimized to provide the appropriate swing speed for the excavator's normal operation. It affects the productivity and precision of the swing movement, allowing for efficient digging and material handling.
Speed Range: The motor - gearbox unit may have a variable speed range. The minimum speed can be [N2] rpm and the maximum speed up to [N3] rpm. This range allows the operator to adjust the swing speed according to the specific requirements of the work, such as slow and precise positioning or rapid swing movements during loading operations.
3. Construction and Components
3.1 Motor - Gearbox Type
Hydraulic Motor with Integrated Gearbox: The 334 - 9968 swing motor comes with a hydraulic motor integrated with a gearbox. The hydraulic motor converts the hydraulic energy into rotational mechanical energy. The gearbox then modifies the speed and torque output to match the requirements of the excavator's swing mechanism.
Casing and Housing: The motor - gearbox casing is made of high - strength materials such as cast iron or alloy steel. The housing provides protection to the internal components and is designed to withstand the forces and pressures generated during operation. It also serves as a mounting structure for other components and helps in dissipating heat.
Internal Components:
Hydraulic Motor: If it's a piston - type hydraulic motor (which is common), the pistons are made of hardened steel and move in a reciprocating motion within cylinders. The pistons are precisely machined to ensure proper sealing and efficient energy conversion. The valve plate controls the flow of hydraulic fluid to and from the pistons, directing the movement and thus the rotation of the motor.
Gearbox: The gearbox contains a set of gears made of high - quality alloy steel. The gears are carefully designed and machined to provide the correct gear ratios for torque multiplication and speed reduction (or increase, depending on the design). Bearings are used to support the shafts and ensure smooth rotation of the gears.
