LME..LUU Series

The LME..LUU series double-wide linear ball bearing is a high-performance linear motion component designed to withstand heavy loads and high speeds. This series of products adopts a double-width structure, providing greater load-bearing capacity and higher stability, and is suitable for use in harsh environments. LME..LUU bearings contain high-precision spheres inside, ensuring smooth motion and low friction coefficients, thereby improving the efficiency and life of mechanical equipment. This kind of bearing is easy to install and requires low maintenance, and is widely used in automation equipment, robots, CNC machine tools and other precision machinery. Through its superior design, the LME..LUU series effectively reduces the gaps between moving parts and improves overall motion accuracy and reliability. It is an indispensable key component in modern industry.

Send inquiry

AUTOMATIC TRANSMISSION · DOUBLE-WIDE · LUU SEALED

LME..LUU Series Double-Wide Linear Ball Bearing

double-wide carriage LUU seals linear ball bearing metric bore

The LME..LUU series is a double-wide linear ball bearing engineered specifically for automatic transmission applications where precise linear motion and high load capacity are required. The extended length-to-diameter ratio provides increased moment resistance and load-carrying capability compared to standard single-width bearings. Equipped with LUU (dual-lip urethane) seals on both ends, the bearing effectively retains lubricant while preventing ingress of transmission fluid contaminants and metallic debris. The precision ball circulation circuit ensures smooth, low-friction motion with consistent rolling resistance across the full stroke. Manufactured from case-hardened bearing steel with ground raceways, this series is designed to withstand the oscillatory motion and variable load conditions found in valve body mechanisms, shift fork guides, and clutch actuator systems. Operating temperature range spans -20°C to +100°C, compatible with standard automatic transmission fluids.

Double-wide design

Increased length-to-diameter ratio provides higher load capacity and improved moment resistance compared to standard single-width linear bearings.

LUU sealing system

Dual-lip urethane seals on both ends effectively retain lubricant and prevent ingress of transmission fluid contaminants and metallic debris.

Ball circulation circuit

Precision-machined ball tracks and recirculation channels ensure smooth, low-friction linear motion with consistent rolling resistance.

Transmission specific

Engineered to withstand oscillatory motion and variable load conditions in valve body mechanisms, shift fork guides, and clutch actuator systems.

Technical specifications

Bore diameter (mm)12mm - 40mm

Outer diameter22mm - 62mm

Length (double-wide)32mm - 80mm

Dynamic load capacity520N - 2650N

Static load capacity800N - 4200N

Seal typeLUU (dual-lip urethane)

Operating temperature-20°C to +100°C

Ball materialGCr15 / SAE 52100

Transmission application scenarios

Shift fork guides

Linear guidance for shift forks in automatic transmission valve bodies, providing precise axial positioning.

Valve spool supports

Bearings for hydraulic valve spools requiring precise axial motion with minimal friction.

Park lock mechanisms

Guiding components in parking lock actuators with intermittent linear motion requirements.

Clutch actuator guides

Supporting linear motion in clutch control and engagement systems within the transmission assembly.

Technical inquiries

What is the advantage of double-wide design over standard linear bearings?

The double-wide configuration provides increased load capacity and improved moment resistance due to the longer length-to-diameter ratio. This allows the bearing to handle higher radial loads and better resist tilting moments in automatic transmission applications where space constraints limit housing length.

How does the LUU seal differ from standard seals?

LUU seals are dual-lip urethane seals that provide enhanced protection against transmission fluid contaminants and metallic debris. The urethane material offers excellent resistance to ATF (Automatic Transmission Fluid) and maintains sealing performance across the full operating temperature range.

What shaft hardness is recommended for LME..LUU bearings?

Recommended shaft hardness is 60-64 HRC with a surface roughness Ra ≤ 0.2 µm. This ensures optimal rolling contact and extends the service life of both the bearing and the shaft in automatic transmission environments.

Is relubrication required for LME..LUU bearings?

LME..LUU bearings are pre-lubricated with transmission-compatible grease. Relubrication interval depends on stroke frequency and environmental contamination level. For high-cycle applications, periodic relubrication through the seal lip is recommended using compatible grease.

Installation guidance

Press the bearing into the housing using a mounting tool that contacts the outer ring only. Ensure shaft surface roughness Ra ≤ 0.2 µm for optimal performance and extended service life.

Lubrication

Pre-lubricated with transmission-compatible grease. Relubrication interval depends on stroke frequency and environmental contamination level.

Storage

Store in original packaging in a clean, dry environment. Avoid exposure to solvents or extreme temperature fluctuations.

Shaft hardness

Recommended shaft hardness: 60-64 HRC for extended service life and consistent linear accuracy in transmission applications.

Bearing Number

Nominal shaft diameter

Major dimensions and tolerance

Eccentricity

Basic load rating(kN)

Weight(Kg)

LME…LUU

Ball circuit

Tolerance

D mm

Tolerance(μm)

L mm

Tolerance(μm)

B mm

Tolerance(μm)

W(mm)

D1(mm)

Dynamic

Static

LME8LUU

-9

0/-9

0/-300

1.1

15.2

421

804

LME12LUU

-9

0/-11

0/-300

45.8

0/-300

1.3

813

1570

LME16LUU

-11

0/-11

0/-300

49.8

0/-300

1.3

24.9

921

1780

115

LME20LUU

-11

0/-13

0/-300

1.6

30.5

1370

2740

180

LME25LUU

-6.5

0/-13

112

0/-400

1.85

1570

3140

430

LME30LUU

-6.5

0/-13

123

0/-400

104.2

0/-400

1.85

44.5

2500

5490

615

LME40LUU

-4

0/-15

151

0/-400

121.2

0/-400

2.15

3430

840

1400

LME50LUU

-4

0/-15

192

0/-400

155.2

0/-400

2.65

680

15900

2320

LME60LUU

-4

0/-20

209

0/-400

170

0/-400

3.15

86.5

7550

200

3920

LME..LUU Series

Submit feedback