What are the factors that affect the starting torque of a cam follower?

Hey there! As a cam follower supplier, I've been in the thick of it when it comes to understanding what makes these little components tick. One of the most crucial aspects that often gets overlooked is the starting torque of a cam follower. In this blog, I'll break down the factors that affect it, so you can make informed decisions when choosing the right cam follower for your application.

SCF16 (5) Cf10 Cam Follower factory

1. Material of the Cam Follower

The material of the cam follower plays a huge role in determining its starting torque. Different materials have different friction coefficients, which directly impact how easily the cam follower can start moving.

Stainless Steel Camshaft: Stainless steel is a popular choice for cam followers due to its corrosion resistance and durability. However, it has a relatively high friction coefficient compared to some other materials. This means that the starting torque for a Stainless Steel Camshaft might be a bit higher. The surface finish of the stainless - steel camshaft also matters. A rougher surface will increase friction and thus raise the starting torque.
Polyurethane Cam Follower: Polyurethane has a lower friction coefficient than stainless steel. This makes Polyurethane Cam Follower easier to start. It's also very flexible and can absorb shocks, which is great for applications where smooth starts are essential. But it might not be as durable as some metal options in high - load or high - temperature environments.
Plastic Cam Followers: Plastic Cam Followers are lightweight and have a low friction coefficient. They are easy to start and are often used in applications where weight and cost are major considerations. However, they may not be suitable for high - load or high - speed applications as they can wear out more quickly.

2. Surface Finish

The surface finish of the cam follower and the cam it interacts with is another important factor. A smooth surface finish reduces friction, which in turn lowers the starting torque.

Polished Surfaces: When the cam follower and the cam have polished surfaces, the contact between them is much smoother. There are fewer irregularities to cause resistance, so the starting torque is reduced. For example, a Cf12 Cam Follower with a highly polished surface will require less force to start moving compared to one with a rough surface.
Rough Surfaces: On the other hand, rough surfaces increase friction. Dirt, debris, or machining marks on the surface can create additional resistance. This means that more torque is needed to overcome the friction and start the cam follower moving.

3. Lubrication

Lubrication is key to reducing the starting torque of a cam follower. It forms a thin film between the cam and the cam follower, reducing direct contact and friction.

Proper Lubrication: Using the right lubricant in the right amount can significantly lower the starting torque. For example, a high - quality grease can provide excellent lubrication for cam followers in most applications. It fills in the small gaps between the surfaces and reduces the coefficient of friction.
Lack of Lubrication: If there is not enough lubrication or if the lubricant has dried out or become contaminated, the friction between the cam and the cam follower will increase. This leads to a higher starting torque and can also cause premature wear and tear.

4. Load

The load applied to the cam follower affects its starting torque. Higher loads mean more force is required to start the cam follower moving.

Static Load: The static load is the load that the cam follower experiences when it is at rest. A higher static load will increase the friction between the cam and the cam follower, resulting in a higher starting torque. For example, if a Cf10 Cam Follower is used in an application where it has to support a heavy weight, more torque will be needed to start it moving.
Dynamic Load: The dynamic load is the load that the cam follower experiences while in motion. It can also affect the starting torque, especially if the load changes suddenly. A sudden increase in the dynamic load can make it more difficult to start the cam follower.

5. Design of the Cam Follower

The design of the cam follower can also have an impact on its starting torque.

Shape: Different shapes of cam followers have different contact areas with the cam. A cam follower with a larger contact area will have more friction and thus a higher starting torque. For example, a flat - faced cam follower may have a higher starting torque compared to a roller - type cam follower because of its larger contact area.
Internal Structure: The internal structure of the cam follower, such as the type of bearing used, can also affect the starting torque. A high - quality bearing with low internal friction will require less torque to start the cam follower moving.

6. Temperature

Temperature can have a significant impact on the starting torque of a cam follower.

High Temperature: At high temperatures, the lubricant can break down, reducing its effectiveness. The material of the cam follower may also expand, increasing the friction between the cam and the cam follower. This leads to a higher starting torque.
Low Temperature: At low temperatures, the lubricant can become more viscous, increasing the resistance to movement. The material of the cam follower may contract, which can also affect the fit and increase the starting torque.

Conclusion

As you can see, there are several factors that affect the starting torque of a cam follower. By understanding these factors, you can choose the right cam follower for your application. Whether you need a Stainless Steel Camshaft for its durability, a Polyurethane Cam Follower for its low friction, or a Cf12 Cam Follower with a specific design, we've got you covered.

If you're in the market for cam followers and want to discuss your requirements, don't hesitate to reach out. We're here to help you make the best choice for your application.