Some basic characteristics of videos that will help those parents who are poorly versed in them to navigate and choose videos for their child.
Rollers. Terms
1. Wheel size
Wheel size is measured in mm. Wheel diameter is measured from one outer edge to the other
through the center of the wheel.
Wheels and roller bearings.
64 mm - small wheels with a center of gravity shifted down, designed for beginners,
students to maintain balance. Such wheels are usually placed on children's roller skates of small sizes.
70 mm - 72 mm, - medium-sized wheels, designed for long-distance riding, for sports and fitness, for recreation.
Choosing children's videos.
76 mm - large wheels that allow you to develop maximum speed.
There are wheels of even larger diameter - 8 cm (these are found on ordinary, non-racing, large rollers). (adults) sizes), and even 10-11 cm for special racing rollers.
On children's inexpensive roller skates (up to about 33-34 in size), usually simple small wheels are placed, such roller skates do not skate quickly, but otherwise it is not necessary, for the safety of the child.
Sliding casters- a very convenient invention that allows a child to buy new videos not every year, but at least once every two years.
ATTENTION! Size! If the child has a foot size of 28, you should not take sliding rollers in sizes 26-29. Feel free to take size 30-33 if the child already has 27-28 foot size. Children's videos are almost always very small. It happens that with a size 28 foot, the child immediately has to push new rollers of size 30-33, otherwise they are small! Rolling on rollers of a larger size (even 2-3 sizes) is easy and convenient, but back-to-back and smaller is simply impossible!
See the review of three-wheeled children's sliding rollers, and the review of the protection for skating in the kit for the rollers.
2. Roller bearings (and skateboards, scooters)
ABEC is the bearing manufacturers' council that sets the international standard for
bearing production.
Bearings are divided by accuracy class - 1, 3, 5, 7. The higher the class, the higher the accuracy
bearing.
Bearing 6082 is used for children's roller skates, or for beginners.
On children's roller skates of small sizes (up to about 33-34), you can not look for ABEC: it is not there, for the safety of small children, the wheels and bearings here are simple, you won’t go far and quickly. The task of the child is to learn not to be afraid of the rollers and just move on them, and not skate fast. Fast - that's later.
3. Wheel hardness
The higher the hardness index, the harder the wheel. Wheels with a low hardness index
provides good traction. Hard wheels provide less grip,
used by experienced rollers and have a longer service life.
How to roller skate, instructions
Instructions for using rollers.
Take inline skating lessons from a professional before you start skating on your own.
Ordinary inline skates are for fitness only, not for aggressive skating,
do not try to perform tricks and dangerous maneuvers.
Be sure to use a helmet and protection kits (for knees, elbows and wrists) while riding.
Wear appropriate clothing.
Before riding on the street, learn how to stop and fall properly. Do not try
ride too fast at the beginning of training.
Important: ski protection!
Use the brake on the back of your boot to control your speed. The brake is an auxiliary device and cannot stop you instantly, control your speed and keep your distance, make sure you can stop in time. Be extremely careful on sloped paths.
When riding, always keep to the right side of the sidewalks and paths. Do not roller skate on the roadway and in crowded places.
Overtake cyclists, pedestrians and other skaters on the left. Always warn them before
start of overtaking. Obey the rules of the road.
Do not roller skate in rain, snow or at night.
To prolong the life of the bearings, protect them from sand, dirt and moisture.
Do not ride on uneven and broken sidewalks. Pay attention to road imperfections.
When riding, do not wear headphones to be able to control the situation.
Failure to follow safety rules while roller skating can lead to
to injury and accidents.
If you find that the wheels are worn out, replace them.
To prevent corrosion, store the rollers in a dry, ventilated area away from sunlight.
All articles about videos on the site. Including - reviews of different models of rollers and protection kits.
The hub bearing is the central element of the chassis, on which both the performance of the car and the safety of the driver, passengers and other road users depend. Failure (wear) of any of the bearings leads to the fact that the car becomes uncontrollable. The wheel hubs must be in good condition, and the condition of these elements should be monitored regularly.
What is important to know about the wheel hub?
Hub- the main part of the rotating part with a hole for stringing on a shaft or axle. It can be coupled to the wheel rim, disc or spokes. Hub elements are pressed into the hole inside the part. To give the mechanism reliability and strength, the hub is made 1.5-2 times larger in diameter than the inner hole. Visually, this can be verified by seeing the very part of the machine.
According to its purpose, the hub is a suspension element of the vehicle that rotates. Wheels are attached to it. If they are leading, then the hub will also be a transmission element. Another element can be connected to the brakes and flanges of the axle shafts. The hub is not only designed to mount with wheels, it also allows them to make rotational movements. The brake system of the car is also closely interconnected with this part.
Basically, the hub is made from different grades of steel and cast iron. The front and rear hubs use ball-shaped angular contact bearings. The hub is rarely changed. Basically, any unpleasant knocks indicating a problem with the hub assembly end up replacing the wheel bearing, except when the hub is assembled and is not collapsible. After replacing the hub, pay attention to the condition of the suspension arms.
Front wheel bearing - what is it?
The front suspension of a car performs a huge number of functions, the main one of which is to ensure vehicle controllability. For reliability, two bearings are installed between the axle of the steering knuckle and the hub. They may vary in size, but must have a conical shape.
They are fixed on the axle with a thrust washer and nut. The more you tighten the nut, the tighter the rollers will be pressed. This makes it possible to very accurately adjust to eliminate backlash.
For the driver, there is one not very convenient factor in the operation of the car. Due to the lack of standard protection and the possibility of contamination in case of violation of the integrity of the oil seal, the wheel hub bearing requires constant attention.
Very often, the lubricant leaks from high temperatures or is washed out when the car interacts with water frequently. Accordingly, road dust and sand enter the hub housing. Abrasive debris leads to wear of parts that will have to be changed.
Components of a wheel bearing
The structure of the wheel bearing. The hub bearing consists of two rings (outer and inner), a separator and a rolling element. The last element depends on the configuration and device of the machine. On the driven axles, tapered single-row bearings are usually used.
The main advantage of these elements is their small size and long service life. But they need high-quality installation and adjustment after a certain time. If this is not done, the bearing may cease to be operational.
For drive axles, double-row tapered bearings or angular contact elements in the form of a ball are used. Double row parts are very similar to their counterparts with driven axles. But besides the similarity in appearance, they can withstand a load 2 times more. The closed bearing design ensures that the part can be used until it is completely worn out. Angular contact bearings can withstand both radial and axial loads at the same time.
Hub bearings - what are they?
Among the huge number of types for the chassis, rolling bearings are selected. During lengthy tests, it turned out that this type provides the least resistance to rotation. Depending on the make and model of the car, the following parts can be used in the design of the chassis:
- radial ball;
Radial roller;
Angular contact (conical) roller.
Bearings can be of various designs. In the classic layout, when the front suspension is independent and the rear axle is leading, two tapered bearings are installed on each front hub, and one radial bearing on the rear (more often these are roller or double-row ball bearings).
The key to ensuring their performance is lubrication. Radial bearings are manufactured with double-sided protection. At the factory, they are closed with plastic dust rings.
Naturally, a lubricant is laid inside the case, which is enough for the entire service life. Many manufacturers prohibit opening their products and changing the lubricant. In this case, the tightness of the anthers is not guaranteed. The front wheel hub bearing is thrust and consists of three separate parts: an inner and outer race and a cassette with rollers. During installation, they are washed and lubricated with Litol-type grease, and are protected by oil seals, which are mounted separately on the hub.
Front wheel bearing replacement
A bearing is a part of a vehicle that cannot be repaired. It should be replaced immediately when it fails. The following symptoms indicate that the replacement of this element is really necessary:
- high level of hub heating or wheel play;
Monotonous hum in the process of movement, noted in the area of the front wheels.
Replacing thrust type bearings is carried out using a special type of press-outs, which make it relatively easy to pull out the failed element from the socket.
It is strongly not recommended to use a hammer to remove bearings, since this “folk method” can cause deformation of their landing sites in the hub. In addition, you need to carefully clean these very seats from lubricants, rust and dirt before installing new elements in them.
1. We put the car "on the handbrake" and first gear. We install anti-roll stops under the rear wheels.
2. Loosen the wheel bolts and with a “30” wrench, unscrew the hub bearing nut (if the car has alloy wheels, then you will first have to remove the wheel, ask an assistant to press the brake pedal and unscrew the hub nut).
3. With a screwdriver we wring out the caliper and with a key we unscrew the caliper from the steering knuckle. We tie the caliper so that it does not hang on the brake hose. Unbolt the brake disc from the hub.
Further work can go according to one of three options:
First, bearing replacement, using a puller, without removing the steering knuckle from the car. The second, removing the steering knuckle from the car and further replacing the bearing already on the workbench, using a puller and a vice. And the third way, the removal of the entire rack and the subsequent replacement of the bearing in a vice. Each of the possible methods has its own advantages and disadvantages.
For example, let's take a closer look at the first method: replacing the hub bearing without removing the steering knuckle from the car is good because you don't have to touch the camber adjustment bolt. But its minus lies in inconvenient work, and it will be quite problematic to replace the bearing without a viewing hole or a lift. So knocking out the hub and pressing out / pressing in the bearing in this position is not very convenient.
Second way: it is much easier and more convenient to replace the bearing, but there is a snag in violation of the camber adjustment of the car. Before unscrewing the bolts securing the steering knuckle to the rack, put two marks. With one mark we mark the position of the adjusting bolt to the rack, and with the second mark the position of the steering knuckle to the rack. When assembling, we achieve the coincidence of these marks. It is possible that the initial accuracy will not be achieved, but the error will be minimal. This method is 100% suitable for those who change not only one hub bearing, but also immediately carry out the rest of the suspension repair (replacement of ball bearings, silent blocks of levers, steering tips, etc.).
Third way, the most labor intensive. To remove the rack, you will have to press out the steering tip, and unscrew the nuts securing the upper support to the body. And after that, on the rack removed from the car, replace the bearing. Not much harder and longer, but ... This method is perfect for those who did not fit either the first or the second method. In our case, the work will be carried out according to the second option.
4. Set labels. We unscrew and knock out, with a soft tip, the bolts of the steering knuckle to the rack. We unscrew the two bolts securing the lower ball joint to the steering knuckle. And remove the steering knuckle.
5. Next, with a tip of a suitable diameter, we knock out the hub from the bearing. Remove retaining ring. We install the puller in a vise and press out the bearing. We clean and lubricate the bearing seat in the steering knuckle. Press in the bearing. Install retaining ring. We install the steering knuckle with the bearing on the hub and with a mandrel of a suitable diameter (the force must be applied to the inner race of the bearing) we hammer in until it stops.
The subsequent assembly is carried out in the reverse order. After tightening the hub bearing nut, do not forget to press the side of the nut.
In our online store there are always roller bearings from trustworthy companies - SCRIBE, Kryptonics, SEBA brands sound no worse for a roller than BMW for a car enthusiast. We guarantee that the abbreviation ABEC on the products we offer is spelled rightly, and our customers will receive products with a long service life, easy maintenance, high reliability, in a word - bearings of the highest quality.
High quality - affordable price
Roller bearings offered by Rollerclub have different design features:
- With a fully closed clip;
- With unilateral anthers;
- With an open clip;
- With removable and non-removable anthers.
Thanks to these features, the degree of accessibility of care is determined. Open and semi-open allows you to easily determine the need for cleaning and lubrication of the bearing, but leads to its accelerated contamination. Products with a closed race are better protected, but you can miss the moment - and the bearing will fail prematurely. You can also purchase SKF bushings from us.
In our store, roller bearings are completely inexpensive, and you can choose the version that was suggested by your own experience. In addition to the purchase, we are ready to offer a large number of services of our service, some of which are free. If you want to know which ones, then by all means devote a few minutes to our site. For our part, we wish you easy and pleasant roller skating!
