How and from whom did the O-ring and X-ring motorcycle chains appear? Motorcycle chains RK: O-RING, X-RING and W-RING O-rings with x-shaped section

• The friction coefficient is lower compared to O-rings;
• The ring does not twist in the sealing joint;
• Can be used at operating pressures up to 40 MPa;
• Suitable for sealing rods and pistons.

The S-Agroservice company sells x rings at manufacturer prices. The catalog on the website contains rubber goods made from nitrile rubber (NBR) and fluoride rubber (FPM). The inner diameter of the rings ranges from 0.74 mm to 494.16 mm. Most items are in stock and can be ordered for delivery throughout Russia.

Fluoride rubber O-rings can withstand harsher environments. They can be used at temperatures from -40 to + 200 C 0 (short-term up to 230 C 0). This material is not afraid of mineral, silicone, vegetable and animal oils and fats, aromatic, aliphatic and chlorinated hydrocarbons, a number of heavy flammable liquids, and fuel. Our products perform well during use. Their quality is confirmed by numerous certificates.

You need x-rings non-standard size?! We will produce them according to your drawings in a short time!

In an article about how to correctly change the drive chain of an O-ring or X-ring system on a motorcycle, I described the procedure for replacing the chain (you can read the article), but said practically nothing about the chains themselves, who invented them and how they appeared . Who is interested in this, then this short article is for you.

Located on the west coast of Japan for almost 80 years, the EK CHAINS company, at the beginning of its rapid activity, produced conventional drive chains for various machines, including chains for low-power motorcycles of those times. The company was founded back in 1941, and for 33 years (just like in Pushkin’s fairy tale: thirty years and three years, but this is a fact from the life of the company) it riveted ordinary chains, approximately the same as our domestic chains, familiar to our domestic motorcyclists.

After 33 years of activity, in 1974, the company made a huge leap forward when it was the first in the world to produce O-ring system chains. On these chains, the company was the first to install links on each axis, tiny rubber rings, which are both oil seals and boots at the same time, and which reduce the loss of lubricant in the link and at the same time prevent dust and dirt from entering the rubbing elements of the chain links. Naturally, as a result of these bells and whistles, the working life of this company’s chains has significantly increased compared to conventional chains, which caused a sensation among the world’s chain manufacturers, and they eventually adopted this experience.

But O-ring chains immediately revealed their disadvantage: when the links of such a chain begin to bend, the rings create a slight friction, and that’s basically the whole disadvantage. But despite such a trifle, the company decided not to stand still and get rid of it. And here is the next stage of evolution in the development of chain technologies of this company: the company is creating a new generation chain - Quadra-X-ring. The oil seals (rings) of this chain have an X-shaped cross-section, with sharp edges at the ends. Thanks to this exclusive shape, these tiny X-shaped seals are much more effective at protecting chain links from dirt, better retaining lubricant inside the link, and on top of that, they also create much less friction when bending (operating) the chain.

The EK CHAINS company produces chains for almost all classes of motorcycles, and I would like to especially note that even heavy-duty chains for drag racing machines, whose engine power can reach more than 500 horses, now imagine what loads these chains can withstand. And more recently, the company made another quantum leap in its development: it began producing chains with Zero Stretch Technology, which added even greater durability to the company’s chains. So know that a chain that is marked with the ZST mark lasts much longer on your motorcycle, as it wears out much more slowly. Having purchased and installed such a chain on your motorcycle, no matter how abruptly you start from a traffic light, you will notice that, unlike other chains, such a chain will not stretch more than a millimeter during the first thousand kilometers. This unique property It was appreciated primarily by athletes, since they can now go on several races without adjusting the chain tension.

The latest feature of this famous company is chains of different colors. Such chains are no different from each other except for color, and their properties are the same, but you must agree that a chain of the same color as your motorcycle will look quite original.

Cage-ring "transformer". Octagon cell shape. The shape of the podium is octagon. The diameter of the combat zone of the MMA cage is 9 m, the size of the combat zone of the boxing ring is 6.1 x 6.1 m. Ideal for competitions and training high level, as in Boxing, Thai boxing, mixed and other martial arts.

The implementation of our unique design developments allows us to transform an MMA cage into a Boxing ring that meets international AIBA standards and back in an hour and a half. No one in the world does this - only SPARTA.

The polymer coating of the chain-link mesh ensures safe contact of fighters with the mesh wire. Chain-link mesh thickness: 4.2 mm. + 1.5 mm. polymer coating. Upon request, it is possible to apply logos to the flooring (bottom) and side and top protective cushions of the cage.

The pillows and sleeves are made of high-quality polyethylene foam filler, covered with expensive, strong, beautiful matte eco-leather.

The design of the cage podium is made using a unique patented “Hook-Up System” technology, which allows you to assemble it using simple tools (a list of which we will send you) in 25 minutes.
No bolts and nuts.
No constipation.
Everything is very simple.

Also, the assembly process is facilitated by the fact that all elements of the metal frame of the podium are covered with a durable polymer composition, and each type of interchangeable elements is painted in its own color, thanks to this you will never mix up the details.

Possible color combinations can be obtained from our managers.

Many of you were probably interested in the issue of motorcycle chains and their varieties. I am sure that almost everyone has come across the products of the Japanese company RK, which has been specializing in motorcycle chains for about 60 years. In 1975 they began developing the first chains with simple O-ring seals. And by 1982, chains of this type were already highly valued and used on many motorcycles, in principle, they are still very popular today, due to their quality and low price. In addition to O-ring chains, the Japanese company RK also produces X-ring chains and the newest W-ring chains.

When choosing a chain, it is also worth remembering its type (420, 428, 520, 525, 530/532), by which you can find out everything in the reference book important parameters chains: pitch, roller diameter, etc.

Materials used in production Q-ring seals :
- nitrile rubber (NBR), Shore hardness 70ShA, 80ShA, 90ShA, operating temperature range from -30 to +100 °C;
- fluoride rubber (FPM, FKM), Shore hardness 70ShA, operating temperature range from -20 to +200 °C;
- ethylene-propylene rubber (EPDM), Shore hardness 70ShA, operating temperature range from -40 to +140 °C.

Specifications Q-ring seals :
- for static or reciprocating movement of the mechanism, the maximum operating pressure is 40 MPa, maximum speed relative displacement 0.5 m/s, at pressures above 10 MPa it is recommended to use support rings;
- for the oscillatory-rotational movement of the mechanism, the maximum operating pressure is 1 MPa, the maximum speed for rotational movement is 2.0 m/s.

Sectional view of the X-ring