Linear Guideway Type VR1-5Z
The Type VR1-5Z Linear Guideway is composed of two guide rails with V-shaped rails and roller cages.
产品概述 (Product Overview)
The Features of Crossed Roller Guides and Ball Guides
“In the VR type, the roller retainer with precision rollers arranged orthogonally is combined with the 90-degree V-shaped groove rolling surface set on the dedicated track. By assembling two rows of roller guides in parallel, the guide system can withstand loads in four directions. Moreover, since pre-load can be applied to the crossed roller guide, a gap-free, high-rigidity, and smooth sliding mechanism can be achieved.
The VB type is a limited linear motion system with low friction and high precision, which combines the ball retainer B type that holds precision steel balls at short pitch intervals with the dedicated track V type. Crossed roller guides and ball guides are widely used in the sliding parts of precision machines such as office equipment and their peripheral devices, various measuring instruments, printed circuit board drilling machines, optical measurement equipment, optical tables, control mechanisms, X-ray devices, etc.”
“【Long Service Life and High Rigidity】
By using a unique roller retention method, the effective contact length of the rollers is increased by 1.7 times compared to traditional products. Moreover, due to the shortened pitch interval of the rollers and the increased number of rollers, the rigidity is doubled and the service life is extended by six times. Therefore, for the vibration and shock problems that are prone to occur in the linear motion section, a fully safe design can be achieved.”
产品概述 (Product Overview)
The Features of Crossed Roller Guides and Ball Guides
“In the VR type, the roller retainer with precision rollers arranged orthogonally is combined with the 90-degree V-shaped groove rolling surface set on the dedicated track. By assembling two rows of roller guides in parallel, the guide system can withstand loads in four directions. Moreover, since pre-load can be applied to the crossed roller guide, a gap-free, high-rigidity, and smooth sliding mechanism can be achieved.
The VB type is a limited linear motion system with low friction and high precision, which combines the ball retainer B type that holds precision steel balls at short pitch intervals with the dedicated track V type. Crossed roller guides and ball guides are widely used in the sliding parts of precision machines such as office equipment and their peripheral devices, various measuring instruments, printed circuit board drilling machines, optical measurement equipment, optical tables, control mechanisms, X-ray devices, etc.”
“【Long Service Life and High Rigidity】
By using a unique roller retention method, the effective contact length of the rollers is increased by 1.7 times compared to traditional products. Moreover, due to the shortened pitch interval of the rollers and the increased number of rollers, the rigidity is doubled and the service life is extended by six times. Therefore, for the vibration and shock problems that are prone to occur in the linear motion section, a fully safe design can be achieved.”
“【Smooth movement】
In the VR type, each roller is separated and retained by a cage, and since the roller pockets in the cage have a surface contact with the rollers, they have good lubricating oil retention, resulting in less wear and smooth rolling motion.”
“【High corrosion resistance】
The VR and VB series also offer stainless steel types with excellent corrosion resistance.”
Types of Crossed Roller Guides / Ball Guides
Crossed Roller Guide VR Type
”
This is a small, high-rigidity linear motion system in which the precision rollers are arranged perpendicularly in a cage and only move along the V-shaped groove of the track for half of the stroke.”
Ball Guide VB Type
”
This is a low-friction, high-precision linear motion system in which precision steel balls are retained by a ball retainer with short pitch intervals and only move along the V-shaped groove of the track for half of the stroke.”
Rated Load and Rated Life
“[Rated Loads in All Directions]
The basic dynamic rated load (Cz) and basic static rated load (Coz) in the dimension table represent the values for one rolling element in the direction shown in the figure. When calculating the rated life, the basic rated loads (C) and (Co) for the actual number of rolling elements in use can be calculated using the following formula.”
” Cz : Basic dynamic rated load of one rolling element in the dimension table (kN)
Coz : Basic static rated load of one rolling element in the dimension table (kN)
Z : Number of rolling elements in use (number of rolling elements in the effective load-carrying area)
P : Spacing of rollers (refer to the specification parameter table)” “【Static Safety Factor fs】
The basic dynamic rated load (Cz) and basic static rated load (Coz) in the dimension table represent the values for one rolling element in the direction shown in the figure. When calculating the rated life, the basic rated loads (C) and (Co) for the actual number of rolling elements in use can be calculated using the following formula.”
“fs : Static Safety Factor (refer to Table 1)
Co : Basic Static Rated Load (kN)
Pc : Calculated Load Value (KN)”
Table 1 The Reference Value of Static Safety Factor (fs)
Use Machinery Load Condition Lower Bound of fs
“【Rated Life】
After calculating the basic dynamic rated load, the rated life of VR and VB models can be calculated according to the following formula. ”
VR type application VB type application
” L : Rated life (km) (the total running distance that a batch of the same VR models (VB models) can reach when they
move separately under the same conditions, and 90% of them do not produce surface peeling. )
C : Basic dynamic rated load (kN)
Pc : Calculated value of load (kN)
fT : Temperature coefficient (refer to Figure 1)
fw : Load factor (refer to Table 2)”
“[Calculation of Life Time]
After the rated life (L) has been obtained, if the stroke length and the number of round trips per minute are fixed, the working life time can be calculated by using the following formula.”
” Lh : Working Life Time (h)
lS : Stroke Length (mm)
n1 : Round Trip Times Per Minute (min-1)”
“fw : load factor
Usually, the reciprocating machinery is accompanied by vibration or impact in operation, especially it is very difficult to correctly calculate the vibration generated during high-speed operation and all the impacts caused by frequent start and stop. Therefore, when the load actually acting on the VR or VB model cannot be obtained, or when the speed and vibration have great influence, please divide the basic rated loads (c) and (C0) by the load factor obtained from experience in Table 2.”