Cvt belt life spanOn 29.10.2020 by Arakasa
It has been said that to a camera or the common observer, tires are a bunch of round black things. That is doubly true of CVT drive belts.
But even if they look the same, all belts are not equal. Belt technology has had to increase as power output of CVT-equipped machines has gone up.
A CVT belt is a type of V-belt. As such, it is the side of the belt that is doing the work. For that reason, the angle of the side of the belt must be compatible with the faces of the CVT.
The width of the belt must be precise as well. A belt has to be strong along its length. That is what is happening inside your transmission. The only connection between the two is the belt. WHY AND HOW In addition to being strong along the length, the belt must be rigid and highly resistant to bowing from side to side, but bend easily along the length of the belt.
First, it has to transmit all the power the engine can put out. This means there can be over pounds of squeeze force trying to crush the belt from the sidewalls. It does all this while running at temperatures ranging from minus 30 to over degrees. The cog on top also aids bending around the pulleys, but adds side-traction, making the cross section strong and generating cooling air in the CVT case.
Between the top cog and the inner cog is the cord. The cord gives the belt the strength lengthwise. The cords are bound into the fiber-reinforced rubber of the cogs with adhesive. The face of the cogs has a fabric cover. With all of the loads facing modern CVT belts, the search for materials that will perform better is constant. Better compounding, adhesives and the tensile cords are all continuously scrutinized.
High-end SxS racing, high-horsepower machines with paddle tires, and mud-boggers with tall, aggressive tires are the hardest machines on CVT belts.UTVs are heavier, so they are harder on CVT belts, whether they are high-horsepower sport models or not. No matter what your CVT-motivated machine is, it will need a new belt sooner or later. It is a highly popular machine, and it has a lot of power.
Certainly, it is a model that is very popular with belt vendors. We included pricing and information for the stock Polaris belt, but that information can pretty much stand in for all OEM belts. All of these companies sell belts for ATVs and UTVs, and even though we concentrated on the high-end models, each company has guides that will help you select the correct belt.
Some companies have a bewildering number of belt models, but as soon as you look for a specific application, there will usually not be more than one or two belts for your specific machine. Some performance shops believe that Mitsubishi manufactures the stock Polaris belt.
Polaris does claim the stock replacement belt with Kevlar cord is built to the tightest tolerances of any belt and that it doubles the life span of aftermarket belts. The stock belt is almost universally praised for its longevity, but it is more expensive than even the most high-end aftermarket belts.
As part of the Timken group, Carlisle makes a variety of belts and other rubber transportation products, and it makes a wide variety of belt styles for ATVs and UTVs. When you look up the applications for a specific model, there are only one or two that apply. We concentrated on the Ultimax ATV belt, which is designed to deliver maximum performance and dependability. DAYCO www. Dayco claims the XTX is engineered with specially formulated, high-temperature polychloroprene with the highest level of aramid fiber reinforcement available.
Its design features deeper cogs on top and rounded cogs on the bottom for ultimate flexibility and longer belt life. Dayco private-labels belts for other brands. EPI www. EPI introduced its first Severe Duty line of belts in They test to design a clutch kit and belt combination that will operate at an acceptable temperature while providing the most aggressive upshift and backshift possible.
Quality control, close tolerances and the design make the Severe Duty belt ready for high horsepower, heavy loads and aggressive riding styles. A one-year limited warranty is provided. GATES www. Both are solid belts with an aggressive top-cog design. This belt features high-temperature neoprene made with the highest level of aramid fiber loading available.
High Lifter does not manufacture belts, but it has the 3GX made to its specs and sells Dayco belts for its Pro Series. The Pro Series is constructed with P-aramid cord reinforcement and engineered, fiber-loaded, neoprene compounding. The 3GX has a one-year limited warranty.If the belt breaks, you could be left stranded on a trail ride or quickly DNF a race. There are many ways to prolong belt life that depend on proper break-in, using the correct clutch set up and most importantly driving style.
Here we will show you how to inspect your current belt and show tips for installing your next one. This is a brand new belt. The area you want to pay close attention to is between the bumps on the underside.
Before installing a new belt it should be washed with warm soap and water and scuffed up with a green Scotchbrite pad. The clutch should be scuffed up too then cleaned with rubbing alchohal.
Keep in mind when you install a belt, The label should be able to be read from the top in the correct direction. This belt would make an excellent spare or reused. This belt only had miles on it when it failed. It was on a heavy 4-seater that had lots of different drivers behind the wheel. We felt it break apart just as we got on the gas coming out of a corner so we quickly stopped. The best way to prevent belt failure is to never hold the engine and belt in the same rpm range more than ten seconds.
You want to modulate the throttle so the belt rides on cooler parts of the clutch sheaves. Rolling on the throttle when coming out of corners instead of flooring it helps too. We put over miles on this belt and were very easy on the throttle.
It was installed in a lighter weight RZRS. The belt is showing signs of wear and should be replaced. The shape of the angled groove dictates engine braking. View the discussion thread. Skip to main content. Follow us facebook twitter instagram rss.
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Helix Options:. More Stories.A continuously variable transmission CVTalso known as a shiftless transmissionstepless transmission, pulley transmission, or, in case of motorcyclesa 'twist-and-go', is an automatic transmission that can change seamlessly through a continuous range of effective gear ratios. This contrasts with other mechanical transmissions that offer a fixed number of gear ratios. The flexibility of a CVT with suitable control may allow the input shaft to maintain a constant angular velocity even as the output speed varies.
When power is more important than economy, the ratio of the CVT can be changed to allow the engine to turn at the RPM at which it produces greatest power. This is typically higher than the RPM that achieves peak efficiency. In low-mass low-torque applications such as motor scooters a belt-driven CVT also offers ease of use and mechanical simplicity. A CVT does not strictly require the presence of a clutch. Nevertheless, in some vehicles e.
Continuously variable transmission
Simple rubber belt non-stretching fixed circumference manufactured using various highly durable and flexible materials CVTs are commonly used in small motorized vehicles, where their mechanical simplicity and ease of use outweigh their comparative inefficiency.
Nearly all snowmobilesutility vehicles, golf carts and motor scooters use CVTs, typically the rubber belt or variable pulley variety. CVTs, along with several other electronic systems and driver aids were prohibited from Formula 1 in due to concerns over escalating research and development costs, and maintaining a specific level of driver involvement with the vehicles.
More recently, [ when? CVT technology uses only one input from a prime mover and delivers variable output speeds and torque, whereas PST technology uses two prime mover inputs and varies the ratio of their contributions to output speed and power. These transmissions are fundamentally different. Farm equipment, namely harvester combines, used variable belt drives as early as the s, as well. Many small tractors and self-propelled mowers for home and garden also use simple rubber belt CVT.
Hydrostatic systems are more common on the larger units—the walk-behind self-propelled mowers are of the slipping belt variety. Ratcheting CVT converting rotary motion to oscillating motion and back to rotary motion using roller clutches are well adapted to reciprocating engines when the oscillating movement is synchronized with that of the pistons. This solution could have a bright future because such ratcheting CVT are also IVT providing the clutch functionand have a very high energy efficiency.
They could help automakers comply with the future emission standards, while also improving the reciprocating engines' performance.
Instead of being dimensioned according to the maximum torque e. Such CVT is used only at startup or in case of mechanical overload, and may be disconnected most of the time, the engine transferring the torque directly to the output. New concepts adapting the transmission ratio to the resistant torque and centrifugal clutches may be used to make these changes automatic.
Bicycles with CVT gearing have had limited commercial success, and can give comparable shifting to an eight-speed cycle. Hydrostatic CVTs are common in small to medium-sized agricultural and earthmoving equipment. As the engines in these machines are typically run at constant power settings to provide hydraulic power or to power machinery, losses in mechanical efficiency are offset by enhanced operational efficiency, such as reduced forward-reverse shuttle times in earthmoving operations.
Transmission output is varied to control both travel speed and direction. This is particularly beneficial in equipment designed to pivot or skid steer through differential power application as the required differential steering action can easily be supplied by independent CVTs, allowing steering to be accomplished without braking losses or loss of tractive effort and allowing the machine to pivot in place.
In mowing or harvesting operations a CVT allows the forward speed of the tractor or combine harvester to be adjusted independently of the engine speed. This allows the operator to slow or accelerate as needed to accommodate variations in thickness of the crop. Some drill presses and milling machines contain a pulley-based CVT system where the output shaft has a pair of manually adjustable conical pulley halves through which a wide drive belt from the motor loops. The pulley on the motor, however, is usually fixed in diameter, or may have a series of given-diameter steps to allow a selection of speed ranges.
A handwheel on the drill press, marked with a scale corresponding to the desired machine speed, is mounted to a reduction gearing system for the operator to precisely control the width of the gap between the pulley halves.
This gap width thus adjusts the speed ratio between the motor's fixed pulley and the output shaft's variable pulley, changing speed of the chuck. A tensioner pulley is implemented in the belt transmission to take up or release the slack in the belt as the speed is altered.A CVT continuously variable transmission is a single-speed transmission that works like an automatic shifter for seamless shifting through a range of gear ratios, unlike other mechanical shifters that offer access to a fixed number of gear ratios.
So, how long do CVT transmissions last? You should look into it if you have intended to purchase a CVT car. A CVT is a lesser-known option to conventional automatic transmissions. What does CVT mean in cars? How long does a cvt transmission last?
The concerns about the shifters lifespan have started after several issues in the first-generation models. Jeep also had issues in the Compass model along with a few others. It has a steel chain about an inch wide that is the main route for transferring power from the engine to the rest of the car. If this chain breaks down for some reasons, the transmission will stop functioning.
When the chain fails, it shatters into pieces with shrapnel everywhere. A traditional auto shifter does not create such a mess when it fails. There could be worn out valves, burnt out clutches, or cracked sun shell, but nothing messy as metal shrapnel. However, the automakers have been working relentlessly to improve the technology. Almost all the newer models of the brands are better than their predecessors. How long do CVT transmissions last if you take good care of them?
At least more than five years! CVT is still a new technology and the automakers have been working to improve it. But, they will still last for a long time if you do proper maintenance. CVT helps with fuel efficiency by increasing the mileage and it has several other advantages. However, not all the models enjoy all the benefits equally. Hopefully this article is useful for you. If you have any car question, feel free to leave us a comment in the box below, we will answer it for you.
Though Honda guarantee the transmission fluid for a lifetime but it is not like that:. More Honda CVT reliability can be found here. Tsukasa Azuma is an awesome car blogger of Car From Japan. He owns a car repair shop at downtown Osaka, and he put all that experience to good use in his sharing posts.
Login with Google. Likes Followers Followers. Import used cars directly from Japan.Nissan Altima 2013 CVT Transmission Blow CAUGHT LIVE
Facts and Fallacies! Maintenance Tips. By Tsukasa Azuma Last updated Oct 1, Our Address. Kings Mills, OH I found most Honda vehicles are designed with CVT transmission now. I am concerned that the chain used for the CVT will not last for long miles, since this chain is the main path to transfer power from engine to vehicle. Any comments on the CVT, pros? If you want my honest opinion as someone who has worked with transmissions, the CVT is not a good choce for a car application.
CVTs are too young a technology in automotive to predict their longevity. Nissan has had serious problems with theirs made by JATCO and Jeep has also had some issues in the Compass and other models that have used it. Hondas, well the CVTs in Hondas seem to be much better but only time will tell.
Most transmission shops will NOT rebuild a CVT due to the nature of how they fail and they instead get replaced for exorbitant amounts. A conventional automatic may fail in a much less catastrophic way such a burnt out clutches, fractured sunshell, worn valvebody etc.
Point being, you are better off with a conventional automatic or manual long term. A CVT would be fine if you were just keeping the car for 5 years or less while still under warranty. I am looking at Jeep cherokee with AT, the bad is that it has 9-speed transmission that is very problematic. I will probable choose a 6speed AT, such as Accord. Thank you, pro. Good luck with whatever you choose!
They actually just released a service bulletin in the last couple of weeks about the somewhat older CVTs. It would appear that someone either goofed or miscalculated the heat treating process on the cones.
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The cones can fail and leave the car inoperable.Heat build up can be caused by several different factors. Driving habits, lack of belt break-in time, vehicle modifications, and most importantly, improperly aligned or adjusted belt and clutch system. In extreme cases, a well maintained and cared for CVT system can help a belt last up to 10, miles. If your machine is burning-up belts frequently, it is likely that the belt is not the problem.
Driving habits affect the life of your CVT belt. One of the biggest issues regarding driving habits, is using high range for all driving conditions. When high range is used in extreme conditions, it causes belt slippage and in turn excessive heat. Extreme conditions can be described as, slow speed over an extended distance, incline at slow speeds, deep mud, towing or plowing.
Lack of belt break-in time can also affect the longevity of your CVT drive belt. The belt needs to surface itself to the sheaves. Follow belt manufacturer or owners manual guidelines. Use care and allow time for break-in before any extreme riding. More details for proper break-in can be found further down on this page.
Vehicle modifications are a double edged sword as far as performance is concerned. Simple bolt-on modifications let you tailor your UTV to your riding area or conditions, but it also creates a need for adjustments to the CVT system. Over-sized tires feature benefits such as increased ground clearance, better handling, and better traction. The downside would be a loss of power, throttle response, and increased belt slippage.
Over-sized tires weigh more than stock tires, which can contribute to belt slippage, but lightweight aluminum rims can offset some of the weight. The largest problem with oversize tires is that it affects the overall gearing. Ground speed also plays a role in this equation. There are clutch kits available that alter engagement and other aspects of clutch performance to compensate for larger tires.
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