German Monninghoff clutch Monninghoff model Monninghoff price

Monninghoff clutches are one of the most widely used and historically oldest types of clutches. They basically consist of four parts: the driving part, the driven part, the clamping mechanism, and the operating mechanism. The driving and driven parts together with the clamping mechanism form the basic structure that ensures the clutch remains engaged and can transmit power, while the operating mechanism is primarily a device for disengaging the clutch.

Monninghoff clutch function

Friction clutches are important components in ship propulsion shafting systems. They use the mechanical friction between friction surfaces to transmit torque from the driving shaft to the driven shaft, and can engage or disengage the main engine from the driven shaft as required. Typically, propulsion systems of various power ratings using non-reversing engines (high-speed diesel engines) as the prime mover often employ friction clutches. In recent years, clutches have also been widely used in single-unit or parallel-drive units with high-power medium-speed diesel engines. In addition to transmitting power, the function of a friction clutch is to engage or disengage the driving and driven shafts at appropriate times, facilitating no-load starting of the main engine; during multi-engine parallel operation, it allows partial units to operate; it enables reversing and two-speed transmission for non-reversing diesel engines; and it supports micro-speed navigation. Friction clutches are generally located between the engine and the gearbox, or integrated with the gearbox into an assembly with clutching and forward/reverse capabilities, serving as the main connection component between the engine and the shafting system. The output shaft of the clutch is the input shaft of the gearbox. If there is no clutch between the engine and the load, a large inertial force will be generated as soon as the engine starts, creating a huge resistance torque on the engine, causing a sharp drop in engine speed or even stalling. With a clutch during startup, the engine can first be separated from the gearbox via the clutch, and then gradually engaged with the clutch while increasing the throttle. The torque transmitted through the clutch gradually increases, and the ship's propulsion force also gradually increases. When the propulsion force exceeds the running resistance, the ship begins to move from a stationary state and accelerates gradually, thus ensuring smooth departure is one of the main functions of the clutch. Another function of the clutch is to ensure smooth transition of operating conditions. During emergency braking, without a clutch, the huge inertial force would cause the transmission system to work under overload, which not only affects the transmission device but may even damage engine components. Furthermore, the combination of clutch and gearbox allows the transmission device to have a reverse function.

Monninghoff clutch working principle

The engine flywheel is the driving member of the clutch. The driven disc with friction linings and the driven hub are connected to the driven shaft (i.e., the input shaft of the transmission) via sliding splines. The pressure spring presses the driven disc against the face of the flywheel. Engine torque is transmitted to the driven disc through the friction between the contact surfaces of the flywheel and the driven disc, and then from there to the drive wheels via the driven shaft and a series of components in the drivetrain. The greater the clamping force of the pressure spring, the greater the torque the clutch can transmit. Since vehicles need to maintain power transmission frequently during driving, and interruption of transmission is only temporarily required, the driving and driven parts of automotive clutches are normally in an engaged state. The spring-loaded clamping device for the friction pair is adopted to meet this requirement. When disengagement of the clutch is desired, simply pressing the pedal in the clutch operating mechanism causes the shift fork, seated in the annular groove of the driven hub, to push the driven disc against the pressure of the clamping spring in the release direction, separating it from the flywheel. Friction disappears, thereby interrupting power transmission. When it is necessary to restore power transmission, to ensure smoother changes in vehicle speed and engine speed, the release speed of the clutch pedal should be appropriately controlled so that the driven disc moves in the engagement direction under the pressure of the clamping spring and restores contact with the flywheel. The pressure between the two contact surfaces gradually increases, and the corresponding friction torque also gradually increases. When the flywheel and driven disc are not yet tightly engaged and the friction torque between them is relatively small, they can rotate at different speeds, meaning the clutch is in a slipping state. As the engagement between the flywheel and driven disc gradually tightens, their rotational speeds tend to equalize. Only when the clutch is fully engaged and slipping stops does the vehicle speed become proportional to the engine speed. The maximum torque that a friction clutch can transmit depends on the maximum static friction torque between the friction surfaces, which in turn is determined by the maximum clamping force between the friction surfaces and the size and nature of the friction surfaces. Therefore, for a clutch of a given structure, the static friction torque is a fixed value. Once the input torque reaches this value, the clutch will slip, thus limiting the torque on the drivetrain and preventing overload.

Monninghoff clutch surface material

Friction elements are the main components of friction clutches, and the physical and mechanical properties of their working surface materials directly affect the performance of the clutch. The main requirements for the material are: a high and stable coefficient of friction, with the dynamic coefficient of friction as close as possible to the static coefficient; high strength to withstand impact, without cracking or spalling at high speeds; good wear resistance, high temperature resistance, corrosion resistance, and thermal conductivity, with minimal thermal deformation; and no sticking after long periods of static storage. Additionally, long service life, ease of processing, and low cost are required. Commonly used friction surface materials include powder metallurgy materials, asbestos-based materials, and paper-based materials. Powder metallurgy materials: These have higher permissible surface temperatures, permissible pressures, coefficients of friction at high temperatures, and service life. Copper-based powder metallurgy materials are mainly used for wet friction surfaces. Iron-based powder metallurgy materials have higher coefficients of friction and permissible pressures than copper-based ones, but lower wear resistance, and are mostly used for dry friction surfaces. Asbestos-based materials: Made by molding asbestos with binders and fillers, consolidated on steel or iron backing plates, with lower permissible operating temperatures. Paper-based materials: Made by interweaving asbestos, plant fibers, or a mixture of both, adding fillers, and bonding with resin or other binders. This material is porous, has good friction performance, similar dynamic and static coefficients of friction, and lower cost.

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