Slip Clutch

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A modern enterprise specialized in development, design, manufacture, sale and service for agricultural machinery transmission systems, including agricultural pto shaft (driveline), gearbox, and other accessories in complete series.

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Over decades' development and great efforts, Changheng has become one of the biggest manufacturers in the field of Agricultural PTO shaft.

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We've developed our own line of forging, machining, assembly, plastic injection, etc. And we have our own CE testing facilities like Torque, Frozen and UV tester. We also designed our own Square testbay with monitered gearboxes and PTO shafts running over 1000 hours.

Definition of Slip Clutch

A slip clutch is a specialized clutch with an integrated freewheel mechanism, developed for performance-oriented motorcycles to mitigate the effects of engine braking when riders decelerate. The main purpose of a slipper clutch is to prevent over engine rev and rear wheel hop (or clatter) especially under hard braking in a vehicle (usually performance motorcycles). It does so by partially slipping until the engine's speed matches with the vehicle's speed upon sudden braking.

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Benefits of Slip Clutch

01.

Better control

A slipper clutch allows the rider to maintain better control over the bike, especially during rapid downshifts. It prevents the rear wheel from locking up and skidding, reducing the chances of losing bike control.

02.

Smoother ride

Slipper clutches engage and disengage smoothly, making for a smoother ride and fewer jerky gear shifts. This can improve the riding experience and reduce rider fatigue.

03.

Reduced wear and tear

Slipper clutches reduce the stress on the gearbox and other bike parts, resulting in less wear and tear. This can increase the longevity of the bike and reduce maintenance costs.

04.

Faster lap times

In racing, slipper clutches can help riders achieve faster lap times by allowing them to brake later and carry more speed through corners. This can give racers a competitive edge on the track.

How Does a Slip Clutch Work?

Torque is controlled by changing the pressure applied to the clutch pack. In an adjustable style clutch, the torque level is controlled by compressing the springs with the adjusting nut.

In a fixed style clutch, a collar is attached to the hub in a fixed position, and the torque level is set by pushing and locking the spring collar to a calibrated position.

Applications of Slip Clutch

Here are some applications where slip clutches can solve motion control problems

Overload Protection

This is one of the most common applications of slip clutches. Overload protection can be provided by anything from a shear pin or ball detent to a friction plate clutch, but the first two solutions has limitations. A shear pin will effectively save the mechanism but will operate only once. It must then be replaced. A ball detent will slip at the set torque, with a pulsating torque going from zero to the breakaway setting. Once the impediment is removed, it will again provide overload protection. The friction plate design will slip at the breakaway torque and give a constant, continuous torque at this setting. It will continue to slip until the impediment is removed. The basic design uses axially loaded plates and friction pads to transmit the torque. The higher the axial load, the higher the torque that can be transmitted. The axial load is supplied mechanically by various spring arrangements. The load also can be applied pneumatically or electrically, in which case the torque can be changed during operation by varying the air pressure or the voltage. Servomechanisms also can vary the torque to suit the needs of the mechanism. This feature also simplifies setup, as changes are easy to dial in and repeat as needed.

Cushioning & Tension Control

The continuous slip capabilities of slip clutches open up many possibilities to cushion loads or control tension. One such example is increasing the speed of a machine or mechanism. Slip clutches can be designed and manufactured so the static friction is lower than the dynamic friction. This results in gradual application of torque, which can cushion loads that are applied suddenly. When the tension on a web of paper or film, a wire or thread is applied gradually in this manner, it is half of the suddenly applied load. This allows the machine to run faster, without overloading and possibly breaking the material.

Types of Slip Clutch

There are three types of slipper clutches.

Mechanical Slipper Clutch

A mechanical clutch uses balls and ramps to enable slippage. Under high engine braking torque, the ramp pushes up the balls, causing the clutch plates to slip against each other. It has a reliable and simple mechanism but requires regular maintenance to ensure the ramps and balls are lubricated and clean.

Hydraulic Slipper Clutch

A hydraulic clutch has a hydraulic piston that controls the clutch plate pressure. Under high engine braking torque, the piston shifts forward, allowing them to slip against each other with minimal pressure on the plates. It has a complex mechanism but has less maintenance needs and ensures a higher consistency.

Electromagnetic Slipper Clutch

An electromagnetic clutch has an electromagnetic coil that controls the clutch plate pressure. With energy on the coil, it creates a magnetic area that attracts the clutch plates, allowing them to slip with minimal pressure. It is the most advanced mechanism among the three types of clutch plates but also the most expensive and complex.

Significance of Slip Clutch

After understanding what a slipper clutch is, let's take a look at its significance

Preventing Rear Wheel Lockup

One of the primary purposes of a slipper clutch is to prevent the rear wheel from locking up during rapid downshifts. This is particularly crucial in high-speed situations, such as on the racetrack, where precise control is essential.

Enhancing Stability

By reducing the abrupt deceleration caused by engine braking, the slipper clutch contributes to enhanced stability and control. It is especially beneficial when navigating challenging corners or making quick manoeuvres.

Reducing Rider Fatigue

The slipper clutch can help reduce rider fatigue by offering a smoother and more controlled downshifting experience. Riders can confidently execute downshifts without worrying about potential rear wheel instability.

Improving Overall Performance

In the realm of high-performance motorcycles and racing, every component plays a role in optimizing overall performance. The slipper clutch is no exception, contributing to the bike's agility and responsiveness.

How Can I Extend the Lifespan of Slip Clutch?

To extend the lifespan of your slip clutch, you should avoid holding the clutch at the biting point for too long and 'riding' the clutch whilst driving downhill.

You should always use the handbrake and neutral gear to park, so that you can take some strain off of the clutch.

Similarly, you should go into neutral when stopping at red lights or junctions.

Many new drivers hesitate when changing gears, but making swift gear changes can lead to less wear and tear.

If you suspect that your clutch is wearing out, then you should book a clutch replacement as soon as possible.

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How do I know if my slip clutch is bad?

If you are experiencing any of these issues, it could mean that your clutch is going out:
Squeaking or unusual grumbling noise when pressure is applied
Difficulty changing gears.
The clutch pedal feels sticky, is vibrating or appearing to feel spongey or loose.
Poor acceleration but still having the ability to rev your engine.
Momentary loss of acceleration caused by a feeling of a 'slipping' clutch.

How Can You Check Your Slip Clutch?

Move your foot up and down on the clutch pedal - is it engaging and disengaging properly? You should be able to feel it through your foot.

Turn the engine on, push the clutch down, and put the car into gear. As you pull away pay attention to how smoothly your car starts to move. The transmission should be easy and efficient. If you change gear and the engine begins to shake, stick or hesitate then your clutch could be slipping. Driving in a quiet place, such as empty grounds or a clear car park, is the perfect way to test your clutch's response.

As you usually would, begin to drive off from first gear, paying extra-close attention to any abnormal behaviour. Carefully monitor your cars response and take your time setting off.

How to Set the Slip Clutch?

The setting on the slip clutch is dependent on many variables – the work, the size of the tractor, as well as the size and type of material it is being used on. It is best to set up each clutch individually if possible. The aim is to start with a loose clutch and tighten it up to the exact point where it stops slipping in normal work/use. If set in this way the clutch will slip if any load exceeds this point, protecting both machine and tractor. It is best to set up the clutch with the machine on the tractor and in conditions that approximate the normal workload that the machine does.

The bolts that go through the springs and hold tension on the slip clutch determine the point at which the clutch slips. These must all be set evenly, either by measuring the spring length or counting the number of turns the nut has been tightened. The clutch must be quite loose initially to ensure it will slip. Slipping should be identified by marking the edge of the clutch and across the outer edge of the linings. (The clutch will always be quite warm during work as the gearbox gets warmed up). Run the machine for a short distance (i.e.) 60 feet under work load and check to see if the clutch slips. Then tighten each tension bolt up 1-turn (more if the clutch was very loose) tighten evenly around the clutch and then run the machine a short distance again. Keep repeating this procedure until the clutch is no longer slipping – it should only take few stops to complete this process.

As you get to the point at which the slip clutch it is not slipping, tighten the tension bolts a half turn instead of a full turn. Continue to work the machine checking the clutch regularly: you will soon get an idea of how the clutch is performing. You may want to adjust it for varying conditions. If the clutch is too loose it will slip, wearing out the friction discs, get hot and possibly damage the clutch pressure surfaces as well. If the clutch is too tight it will fail to protect the tractor and machine if the machine hits an obstruction (tractor stalls, breakage occurs).

Our Factory

Founded in 1995, Zhejiang Changheng Machinery Group Co., Ltd is now a modern enterprise specialized in development, design, manufacture, sale and service for agricultural machinery transmission systems, including agricultural pto shaft (driveline), gearbox, and other accessories in complete series.
● We've developed our own line of forging, machining, assembly, plastic injection, etc.
● We have our own CE testing facilities like Torque, Frozen and UV tester.
● We also designed our own Square testbay with monitered gearboxes and PTO shafts running over 1000 hours.

Our Certificate

Ultimate FAQ Guide to Slip Clutch

Q: Is a slipper clutch necessary for beginners?

A: Although it is not necessary, it is extremely important for bikers on tracks or if their riding style involves high speeds and fast downshifts.

Q: Which is better, a wet clutch or a slipper clutch?

A: A slipper clutch is better as it can withstand high braking force, aggressive downshifts, and rear wheel lock-ups.

Q: What is the effect of the slipper clutch?

A: It prevents skidding and locking up of the rear wheel, minimising the chances of lost bike control. Consequently, it ensures smooth and safe rides at high speeds.

Q: Can we replace the normal clutch with a slipper clutch?

A: Since it is a complex mechanism, replacing a normal clutch with an after-market slipper clutch is not advisable.

Q: Does the slipper clutch prevent engine braking?

A: The primary function of a slipper clutch is to prevent the transmission of the engine braking force to the rear wheel.

Q: How long does a slip clutch last?

A: A slip clutch is designed to last between 50,000 miles to 100,000 miles, though some factors can impact the lifespan of your clutch:
Mileage – if your car has done a lot of miles, your clutch will most likely have more signs of wear and usage.
Style of driving – If you are prone to fast gear changes or harsh acceleration, the longevity of your clutch will be affected.
Maintenance – If you don't maintain your car and have regular servicing, particularly if you drive more often or drive more miles, then your clutch can be impacted.

Q: What should I do if my slip clutch is slipping?

A: The first thing you should do if you notice your clutch slipping is to stop driving and get your clutch checked. A slipping clutch or a clutch going out is not only dangerous to you, but other motorists on the road. We recommend you pull over wherever is safest to do so and have your vehicle checked over by a professional. Simply locate your nearest Formula One Autocentre where our trained experts can help.

Q: What are the signs of slip clutch failure?

A: Signs your clutch is slipping could help you avoid paying to fix other issues with the vehicle. Examples include unusually high RPMs, challenge to change gear, a grinding noise from the engine, and a strong burning smell. Clutches can be expensive to fix, so knowing when it might be having issues is important – as sorting it before it damages other parts of the vehicle can save a large bill.

Q: How to free up the slip clutch after a period of storage?

A: The slip clutch can seize if left for long periods without use or if stored out in the elements, as water can cause clutch linings to rust and seize as well. The best way to free up a slip clutch is to loosen all the bolts that hold the spring tension on the friction plates (loosen so they are quite loose), then run the machine under heavy work load until the clutch slips. The clutch only needs to be slipped for 30 seconds to a minute to clean up the surfaces. Alternatively, dismantle the clutch and clean it then re-assemble and adjust the tension on springs.

Q: What is a slip clutch made from?

A: Slip clutches typically contain multiple layers within a compact, disc-like mechanism that includes pressure plates, friction plates, and springs. All slip clutches perform the basic function of controlling the torque between two elements. They can be supplied as a shaft-to-shaft coupling or a shaft to pulley, gear, or sprocket model. Slip clutches can be provided with non-standard bore sizes, keyways, low backlash or higher torque, minus housings and with pulley, gear or sprocket. Imagination and ingenuity have resulted in the development of additional slip clutch variations.

Q: How does a slip clutch work?

A: The main difference between a slipper clutch and a normal clutch is the clutch hub. A slipper clutch assembly uses ramps to drive apart from the clutch plates and these ramps are built into the inner basket as well as the pressure plate. These ramps can slip or slide in the direction of the rotation of the wheel. So, with this kind of advanced & complex arrangement, even if you downshift more than one or two gears at a time, the rear wheel won_x0019_t be able to over-rev the engine. In such scenarios, the ramps slide or slip over each other, pushing the pressure plate away from the clutch and thus avoiding engine over-revving, rear-wheel locking or hop.

Q: Is it safe to use a slip clutch?

A: The slip clutch represents a significant advancement in motorcycle technology. Whether on the racetrack or navigating challenging roads, the slipper clutch's ability to mitigate the effects of engine braking contributes to a smoother and safer riding experience. As motorcycle manufacturers continue to innovate and refine their designs, the slipper clutch has become a standard feature in many high-performance and sport-oriented bikes.

Q: What does a slip clutch do?

A: The slip clutch separates the engine from the wheels. This allows you to change gear and to stop your vehicle while the engine is still running. Without it, you'd be unable to drive properly – making it an integral part of your vehicle. The clutch is made up of three parts:
Clutch plate.
Pressure plate.
Flywheel.

Q: How Does a slip clutch Work?

A: Now that you know what a slipper clutch is in a bike, it primarily modifies the connection between the engine and gearbox. While quick deceleration may cause lock-up and instability, a slipper clutch slips and partially disengages in such situations. During a downshift, the clutch hold releases, allowing the plates to slide against each other. It reduces the force on the back wheel, resulting in a controlled slide. It assures bike stability and avoids wheel lock-up or hop, ensuring a smooth and safe ride.

Q: What are the Parts of a slip clutch?

A: It includes clutch plates made of steel and friction plates that engage and release the power gearbox to the rear wheel. Its ramp mechanism has two cams with inclines or ramps – one on the clutch hub and another on the pressure plate. The plates slip when the pressure plate presses against the clutch to keep it engaged. It also has springs that hold the clutch plates under pressure to keep them engaged. Finally, the release mechanism disengages the clutch plates during normal shifting and gets activated when the user lifts the clutch lever.

Q: What are the benefits of a slip clutch?

A: The main purpose of a slip clutch is to prevent over engine rev and rear wheel hop (or clatter) especially under hard braking in a vehicle (usually performance motorcycles). It does so by partially slipping until the engine's speed matches with the vehicle's speed upon sudden braking.

Q: Can you stall with a slip clutch?

A: Once the deceleration and engine braking lessens, the clutch reengages. So, you still have to pull the clutch in to stop the bike from stalling. In short, a slip clutch is designed to limit wheel hop on deceleration and when downshifting into corners, but it will still stall like a full manual clutch.

Q: Can you engine brake with slip clutch?

A: Slip clutch is intended to make aggressive downshifts and engine braking safer. Engine braking not works on slip clutch. But engine braking should be necessary beacuse if breakes fail then their will be no other option to stop bike.

Q: Which is better slip clutch or normal clutch?

A: A slip clutch reduces the effects of engine braking. It also reduces wear and tear on the engine and transmission, thereby improving its durability. A slip clutch prevents the rear-wheel from locking-up in case of any uncertain situation. slip clutch improves the performance of the motorcycle.

Q: Why do you need a slip clutch?

We're well-known as one of the leading slip clutch manufacturers and suppliers in China. If you're going to wholesale customized slip clutch with competitive price, welcome to get quotation from our factory.

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