Hiwin Hgr20 20mm Linear Guide Rail with Blocks

Since our establishment, we have adhered to the road of technological innovation, continuously committed to the research and development of Linear Guide Ways, XY Work Table Linear Guides, Linear Motion Guides, and invested a lot of money in technology, equipment and modern management. We constantly improve our professional and technical capabilities, optimize processing technology, improve efficiency and reduce costs and enhance the market competitiveness of our customers. Our company is a customer-oriented, service-oriented, sincere company. We provide customers with perfect service in line with years of industry experience accumulation according to the city changes. Since its establishment, our company has designed and manufactured high quality products to serve the public with its enterprise management and high standard quality management system.

The motion of linear guideway is realized by rolling of steel ball, there will be no deviation or slipping phenomenon when it makes linear guide run.

The frictional force is very small when the linear guideway moves. detected by laser and other advanced process.

Linear guides are mainly used in mechanical structures with high precision requirements, such as grinding machines.

Model	M	W	L	B	C	S	W1	W2	M1	F
TRH15B	28	34	61.8	26	26	M4×0.7×5	15	9.5	15	60
TRH20B	30	44	77.4	32	36	M5×0.8×6	20	12	18	60
TRH20BL	30	44	93.4	32	50	M5×0.8×6	20	12	18	60
TRH25B	40	48	83.5	35	35	M6×8	23	12.5	22	60
TRH25BL	40	48	102.6	35	50	M6×8	23	12.5	22	60
TRH30B	45	60	100.5	40	40	M8×10	28	16	26	80
TRH30BL	45	60	123	40	60	M8×10	28	16	26	80
TRH35B	55	70	113.9	50	50	M8×12	34	18	29	80
TRH35BL	55	70	139.2	50	72	M8×12	34	18	29	80
TRH45B	70	86	138.5	60	60	M10×17	45	20.5	38	105
TRH45BL	70	86	169.5	60	80	M10×17	45	20.5	38	105
TRH55B	80	100	163	75	75	M12×18	53	23.5	44	120
TRH55BL	80	100	201	75	95	M12×18	53	23.5	44	120

Data unit is mm

Oil whirl can be prevented by a stabilising force applied to the journal. A number of bearing designs seek to use bearing geometry to either provide an obstacle to the whirling fluid or to provide a stabilising load to minimize whirl. One such is called the lemon bore or elliptical bore. In this design, shims are installed between the two halves of the bearing housing and then the bore is machined to size. After the shims are removed, the bore resembles a lemon shape, which decreases the clearance in one direction of the bore and increases the pre-load in that direction. The disadvantage of this design is its lower load carrying capacity, as compared to typical journal bearings. It is also still susceptible to oil whirl at high speeds, however its cost is relatively low.

Another design is the pressure dam or dammed groove,^[35] which has a shallow relief cut in the center of the bearing over the top half of the bearing. The groove abruptly stops in order to create a downward force to stabilize the journal. This design has a high load capacity and corrects most oil whirl situations. The disadvantage is that it only works in one direction. Offsetting the bearing halves does the same thing as the pressure dam. The only difference is the load capacity increases as the offset increases.^[11]

A more radical design is the tilting-pad design, which uses multiple pads that are designed to move with changing loads. It is usually used in very large applications but also finds extensive application in modern turbomachinery because it almost completely eliminates oil whirl.

One disadvantage specific to fluid-lubricated, hydrodynamic journal bearings in high-speed machinery is oil whirl—a self-excited vibration of the journal. Oil whirl occurs when the lubrication wedge becomes unstable: small disturbances of the journal result in reaction forces from the oil film, which cause further movement, causing both the oil film and the journal to "whirl" around the bearing shell. Typically the whirl frequency is around 42% of the journal turning speed. In extreme cases oil whirl leads to direct contact between the journal and the bearing, which quickly wears out the bearing. In some cases the frequency of the whirl coincides with and "locks on to" the critical speed of the machine shaft; this condition is known as "oil whip". Oil whip can be very destructive.

With the diversified marketing mode, we can provide you with the best Hiwin Hgr20 20mm Linear Guide Rail with Blocks solution according to the different needs of customers. Best Source will always stand ready to cooperate with you. We will work hard to provide customers with high-quality products and services with a pragmatic and innovative spirit.