Model JR Structural Member Rail Type
16Pages

TOKYO. JAPAN

Structural Member Rail, Four-way Equal Load Type Upper plate Grease nipple Cross section Balls roll in four rows of raceways precision-ground on an LM rail and an LM block, and endplates incorporated in the LM block allow the balls to circulate. Since retainer plates hold the balls, they do not fall out even if the LM rail is pulled out. Model JR uses the same LM block as model HSR, which has a proven track record and is highly reliable. The LM rail has a sectional shape with high bending rigidity, and therefore can be used as a structural Unlike the conventional LM Guide, whose LM rail was...

Model JR - Product Overview Since the central part of the LM rail is thinly structured, the LM Guide is capable of absorbing an error and achieving smooth motion even if the parallelism between the 2 rails is insufficient. Since the LM rail has a sectional shape with high bending rigidity, this model can be used as a structural I Major applications I Automated warehouse / garage / gantry robot / FMS traveling rail / elevator / conveyance system / welding machine / lifter / crane / forklift / coating machine / shield tunneling machine/stage setting The flange of the LM block has tapped The...

(3 Rated Loads in All Directions Model JR is capable of receiving loads in all four directions: radial, reverse- radial and lateral directions. The basic load ratings are uniform in the four directions (radial, reverse-radial and lateral directions), and their actual values are Reverse-radial direction Radial direction (^Equivalent Load When the LM block of model JR receives loads in all directions simultaneously, the equivalent load is obtained from the equation below. PE Equivalent load (N) PR :Radial load (N) Radial direction PL :Reverse-radial load (N) Reverse-radial direction PT...

Model JR - Product Overview QService life The service life of an LM Guide is subject to variations even under the same operational conditions. Therefore, it is necessary to use the rated life defined below as a reference value for obtaining the service life of the LM Guide. •Rated life The rated life means the total travel distance that 90% of a group of units of the same LM Guide model can achieve without flaking (scale-like exfoliation on the metal surface) after individually running under the same •Service life time Once the rated life (L) has been obtained, the service life time can be...

Preload is an internal load elements (balls, rollers designated value before being shipped. Therefore, it O Radial Clearance Standard Since the radial clearance of an LM Guide greatly affects the running accuracy, load carrying capacity and rigidity of the LM Guide, it is important to select an appropriate clearance according to the In general, selecting a negative clearance (i.e., a preload*1 is applied) while taking into account possible vibrations and impact generated from reciprocating motion favorably affects the service Radial clearance

Model JR - Product Overview The accuracy of model JR is specified in terms of running parallelism ( ), dimensional tolerance for height and width, and height and width difference between a pair (*2 *3) when two or more LM blocks are used on one rail or when two or more rails are mounted on the same plane. Accuracies of model JR are defined by model numbers as indicated in the table below. error between the LM block and the LM rail datum plane when the LM block travels rail with the LM rail secured plane using bolts maximum values of height blocks used on the same width (W2) between each of...

O Shoulder Height of the Mounting Base and the Corner Radius Normally, the mounting base for the LM rail and the LM block has a datum plane on the side face of the shoulder of the base in order to allow easy installation and highly accurate positioning. The corner of the mounting shoulder must be machined to have a recess, or machined to be smaller than the corner radius "r," to prevent interference with the chamfer of the LM rail or the LM

Model JR - Product Overview Q Error Allowance in the Parallelism Between Two Rails The following table shows error allowances in parallelism (P) between two rails that will not affect the service life in normal operation. Q Error Allowance in Vertical Level Between Two Rails The values in the table each indicate the error | ^ | allowances in vertical level between two rails j___ are proportional to the axis-to-axis distances. '— —'_'— ! —' |

Models JR-A/JR-B/JR-R Dimensional Table for Models JR-A/JR-B/JR-R "**" indicates a through hole. ■ Example of model number JR35 R 2 UU +1000L ÖModel number HType of LM block HNo. of LM blocks used on the same rail □Dust prevention accessory symbol (see page 13) 0LM rail length (in mm)

Static permissible moment*: 1 block: static permissible moment value with 1 LM block 2 blocks: static permissible moment value with 2 blocks closely contacting with each other

Standard Length and Maximum Length of the LM Rail The table below shows the standard LM rail lengths and the maximum lengths of model JR variations. If the maximum length of the desired LM rail exceeds them, connected rails will be used. Contact THK for details. Standard Length and Maximum Length of the LM Rail for Model JR Note 1 : If connected rails are not allowed and a greater length than the maximum values above is required, contact THK. Note 2: For connecting two or more rails, a metal fitting like the one shown in the figure below is available. Contact THK for details.

Image JR OPTIONS Options For model JR, dust-prevention accessories are available. Make a selection according to the application and the installation site. 3 Double seals Spacer 1 End seal 4 Metal scraper 2 Side seal

Dust Prevention Accessories When foreign matter enters an LM system, it will cause abnormal wear or shorten the service life. It is necessary to prevent foreign matter from entering the system. Therefore, when possible entrance of foreign matter is predicted, it is important to select an effective sealing device or dust-prevention device that meets the working conditions. Used in locations exposed to Side seal Used in locations where dust may enter the LM block from the side or bottom surface, such as vertical, horizontal and inverted Side seal Double seals Used in locations exposed to much...