Linear Motion Bushing

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  • GTA Linear Motion Bushing The GTA linear motion bushing features easy and convenient lubrication, maintenance and replacement. It offers lower power consumption, making it energy saving. The rail shaft features high durability, lasting accuracy and reliable performance, as it is made of quality alloy steel that has undergone medium frequency induction quenching to reach HRC58-63 hardness.
  • GTB Linear Motion Bushing The GTB linear motion bushing can operate in high speed motion and it can also realize flexible, accurate and smooth motion at low speed. As the linear motion bushing can adjust its own structure to fit the size of its mating parts, the requirement on the accuracy of the mating parts is lowered.

Linear Motion Bushing

The linear motion bushing has a low friction coefficient within 0.001-0.004, allowing for smooth motion and a long service life. Not only can it operate in high speed motion, it can also realize flexible, lasting accuracy and smooth motion at low speed. In addition, the linear motion bushing can adjust its own structure to fit the size of its mating parts, so the requirement on the accuracy of the mating parts is lowered.

The rail shaft features high durability and reliable performance because it is made of quality alloy steel that has undergone medium frequency induction quenching to reach the hardness of HRC58-63. The linear motion bushing has low power consumption, making it energy saving. It is also easy and convenient to lubricate, maintain and replace.

The linear motion bushing consists of linear motion ball bearing, rail shaft and their supporting bases. It can be classified into open type linear motion bushing and close type linear motion bushing.

GTA (general series) or GTAt (special series) open type linear motion bushing can have over two supporting bases for the rail shaft if necessary. This design can eliminate the influence of rail shaft dead weight on the total height of ball bearing supporting bases and motion parallelism, to achieve higher accuracy in motion. The open type linear motion bushing is especially suitable for the use in long travel distance equipment. In addition, the clearance of open type linear motion bushing is adjustable.

The close type linear motion bushing has the following types: GTB (general series), GTBt (special series), GTB-T with adjustable clearance (general series) and GTB-t with adjustable clearance (special series). Equipped with two rail shaft supporting bases, it is commonly used for short travel distance equipment or when high motion accuracy is not required.

The linear motion bushing is packed in paper based packages for export or in wooden cases marked with IPPC. The strong and moisture proof package makes it suitable for long distance transport.

As a professional linear motion bushing manufacturer based in China, YiGong also supplies CNC worktable, precision ball screw, linear guide, water jet cutting machine, and much more.

1.Configuration
Cylindrical ball bushing consists of linear motion ball bearing,rail shaft,ball bearing supporting base ,shaft supporting base,other parts and so on. There are two types:close type and open type;they both are classified according to products'structure.The former has two type:clearance-adjustable and clearance-nonadjustable ;the latter has only one :clearance-adjustable type.Thereinto GTC type linear motion bushing is other model of open type linear motion bushing.The difference of GTC and GTA is different mounting way .It is more flexible than GTA..It can not only save mounting space,but also keep relevant accuracy.

When necessary ,two more suporting bases for rail shaft may be fitted with GTA(general series)and GTAt(special series)open type.It is to eliminate the influence caused by deadweight of rail shaft on total height(H) of ball bearing supporting base and motion parallelism. This configuration is special suitable for specifications of large travel distance,so higher motion accuracy could be achieved.
Two or more supporting bases could not be fitted with these type ball bushing:such as GTB(general series),GTBt(special series),GTB-t clearance-adjustbale(general series)and GTBt-t clearance -nonadjustable(special series).Therefore,the deadweight of rail shaft will inevitably influence the total height of bearing supporting base and motion parallelism.Thus,these type are generally used in short travel distance or low motion accuracy occasions.

2. Characters and features
(1)Friction coefficient value is very small,only 0.001~0.004.Power consumption is very low and energy could be economized.
(2)Flexible accurate motion performance in trace amount;no crawling at low speed.
(3)Self-adjustable structure,so the lower accuracy of supplementary parts could be used.
(4)Lubrication is easy and maintenance is convenient.Replacing parts can be done promptly.
(5)Motion speed and positoning accuracy are very high and long travel distance is available.
(6)Rail shaft is made of good-quality alloy steel after quenching HRC58-63,capable of standing wearp;stability performance and accuracy-keeping function.

3. Accuracy grade
(1)Accuracy grade are classified as three precision grade(grade J),common grade (including two kinds:grade P, grade P1) according to manufacturing accuracy of balls bearing.Permission tolerance values of cach grade are shown in following table.
(2)Mate of rail shaft with inscribed circle of ball bearing is g6/H7.the same for mounting external circle with inner bore of supporting base. Different type for different use
Clearance-nonadjustable type :GTB,GTBt
Clearance-adjustable type :GTA GTAt GTB-t GTBt-t and GTC
If special requirements are demanded,please consult with us.
(3)With both are fitted in parallelism on the same surface,if each size H is requested in a coherence with the others,please make the notify in your contact.

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