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KML MOTION INDUSTRIES CO. LTD
Wheel Hub Bearing and Hub Units

Wheel Hub Bearing and Hub Units

Product catalog summary

Overview

This document provides comprehensive technical specifications and classification data for second and third generation passenger car wheel hub bearing units, focusing on double row angular contact ball bearings with two inner rings. It covers both driven and non-driven wheel applications, emphasizing dimensional accuracy, bearing configurations, and mounting details essential for automotive wheel assemblies.

1. Bearing Types and Construction

The primary bearing type detailed is the double row angular contact ball bearing featuring two inner rings, designed to enhance load capacity and durability. These bearings are integrated into HUB units suitable for passenger car wheels, supporting both driving and non-driving positions.

2. Technical Specifications and Dimensions

The document contains extensive tabulated data covering key parameters critical for fitment and performance, including:

Flange Diameter (A): Outer ring flange diameter, ranging approximately from 32 mm to over 180 mm depending on the model.
Bolt Circle Diameter (B): Typically between 100 mm and 140 mm.
Bolt Size and Quantity (C): Commonly M10, M12, or M14 bolts with thread pitches such as 1.25 or 1.5, and quantities ranging from 3 to 6 bolts.
Wheel Pilot Diameter (D) and Brake Pilot Diameter (E): Dimensions vary to ensure compatibility with wheel and brake components.
Flange Offset (F) and Hub Pilot Diameter (G): Important for mounting alignment and shaft engagement.
Number of Splines (J): Varies by model, affecting torque transmission and shaft fit.
Bolt Hole Size (H) and Flange Shape (K): Specified to match vehicle requirements and ensure secure mounting.

3. Hub Units and Bearing Models

The document identifies multiple HUB unit models, notably from the DACF and DAC2F series, which are double-row angular contact ball bearings with integrated raceways press-fitted into flanges. These models are categorized by generation and shaft application:

Second Generation Units: Designed for both driven and non-driven shafts with specific part numbers and configurations.
Third Generation Units: Incorporate advanced bearing technology and integrated raceways for improved durability and performance.

4. Flange and Bolt Configurations

Flange types are classified into four main shapes (A, B, C, D), each with distinct bolt hole patterns and sizes. Bolt hole counts range from 3 to 6, with bolt sizes typically M10, M12, or M14. Thread pitches and hole diameters are specified to ensure compatibility with various vehicle wheel hubs and brake assemblies.

5. Bearing Configurations and Features

Bearing configurations are denoted by Roman numerals (I, II, III, V, VII, VIII), indicating internal design variations such as integrated raceways or ABS compatibility. These configurations influence performance characteristics and suitability for specific vehicle systems.

6. Application and Compatibility

The data supports precise selection of wheel hub bearing units for passenger cars, ensuring compatibility with vehicle-specific requirements for driving or non-driving wheels. Detailed dimensional and bolt pattern data facilitate correct installation and reliable operation.

7. Part Number Cross-References and Identification

The document includes extensive part numbers, KML codes, and OEM references to aid in identification, ordering, and maintenance of bearing units and HUB assemblies.

Critical Information and Best Practices

Verify flange type and bolt size compatibility with the vehicle’s wheel hub assembly to ensure secure mounting.
Confirm dimensional tolerances and boundary dimensions to avoid fitment issues.
Use specified double row angular contact ball bearings with two inner rings for optimal load handling and durability.
Cross-reference KML and part numbers carefully for accurate replacement and maintenance.
Consider bearing configuration codes for compatibility with ABS and other vehicle systems.
Follow appropriate bolt torque and installation procedures consistent with bolt specifications.

Conclusion

This document serves as a detailed technical reference for automotive wheel hub bearing units and HUB assemblies, providing essential dimensional data, bearing configurations, flange and bolt specifications, and part number cross-references. It is a critical resource for engineers, technicians, and parts suppliers involved in the selection, installation, and maintenance of passenger car wheel bearings, reflecting evolving technology across multiple bearing generations.

Catalog excerpts

K^fL HUB Units and Bearings Double row angular contact ball bearing

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K^fL HUB Units and Bearings Double row angular contact ball bearing

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KJ^fL HUB Units and Bearings Double row angular contact ball bearing

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KJJrfi- HUB Units and Bearings Double row angular contact ball bearing

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K^fL HUB Units and Bearings Double row angular contact ball bearing Outer ring with flange HUB Units and Wheel Bearings Passenger Car Wheel Bearings Second generation wheel hub bearing units ball bearing type for driving and non-driving wheel Type A Type B Type C Type D Outer ring flange Bolt size Bolt hole

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KML HUB Units and Wheel Bearings Passenger Car Wheel Bearings Second generation wheel hub bearing units ball bearing type for driving and non-driving wheel Type A Type B Type C Type D HUB Units and Wheel Bearings Passenger Car Wheel Bearings Second generation wheel hub bearing units ball bearing type for driving and non-driving wheel Type A Type B Type C Type D Outer ring flange Bolt size Bolt hole

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Passenger Car Wheel Bearings Second generation wheel hub bearing units ball bearing type for driving and non-driving wheel Type A Type B Type C Type D HUB Units and Wheel Bearings Passenger Car Wheel Bearings Second generation wheel hub bearing units ball bearing type for driving and non-driving wheel Type A Type B Type C Type D Outer ring flange Bolt size Bolt hole

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HUB Units and Wheel Bearings HUB Units and Wheel Bearings Passenger Car Wheel Bearings Passenger Car Wheel Bearings Second generation wheel hub bearing units Second generation wheel hub bearing units ball bearing type for driving and non-driving wheel ball bearing type for driving and non-driving wheel Outer ring flange H Bolt size Bolt hole diameter Flange Shape Type D Outer ring flange Bolt size Bolt hole diameter Flange Shape

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HUB Units and Wheel Bearings HUB Units and Wheel Bearings Passenger Car Wheel Bearings Passenger Car Wheel Bearings Third generation wheel hub bearing units Second generation wheel hub bearing units ball bearing type for driving and non-driving wheel Outer ring flange H Bolt size Bolt hole diameter Flange Shape Integrated raceway a DAC bearing is press fit into two flanges 'Wheel 'Bolt 'Bolt pilot circle size Dia. (Quantity) Dia. D B C 'Bolt circle 'Bolt size Bearing 'Flange Config-

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HUB Units and Wheel Bearings 'Wheel 'Bolt 'Bolt pilot circle size Dia. (Quantity) Dia. D B C HUB Units and Wheel Bearings 'Bolt circle 'Bolt size Bearing 'Flange Config- 'Wheel 'Bolt 'Bolt pilot circle size Dia. (Quantity) Dia. D B C 'Bolt circle 'Bolt size Bearing 'Flange Config-

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HUB Units and Wheel Bearings 'Wheel 'Bolt 'Bolt pilot circle size Dia. (Quantity) Dia. D B C HUB Units and Wheel Bearings 'Bolt circle 'Bolt size Bearing 'Flange Config- DAC2F Series double-row angular contact ball bearings Third generation wheel hub bearing units Passenger Car Wheel Bearings Integrated raceway a DAC bearing is press fit into two flanges Outer Flange Bolt Hole Size & Hole Dia. (Q'ty) Bearing Unit Model K Outer Flange Shape S

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HUB Units and Wheel Bearings Wheel Hub Bearing and HUB Units Second generation wheel hub bearing units Passenger Car Wheel Bearings Wheel hub and bearings a DAC bearing is press fit into two flanges 'Wheel pilot 'Brake pilot Dia. Dia. D E Bearing outer Attachment bolt size Dia. (Quantity) G H 'Bolt size (Quantity) C

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Wheel Hub Bearing and HUB Units Wheel Hub Bearing and HUB Units Second generation wheel hub bearing units for driven shafts

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Wheel Hub Bearing and HUB Units Wheel Hub Bearing and HUB Units Second generation wheel hub bearing units for non-driven shaft

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Wheel Hub Bearing and HUB Units Wheel Hub Bearing and HUB Units

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Wheel Hub Bearing and HUB Units Wheel Hub Bearing and HUB Units Second generation wheel hub bearing units for driven shafts [&] Integrated raceway

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Wheel Hub Bearing and HUB Units Wheel Hub Bearing and HUB Units Third generation wheel hub bearing units Third generation wheel hub bearing units for-driven shaft for-driven shaft

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Wheel Hub Bearing and HUB Units Wheel Hub Bearing and HUB Units Third generation wheel hub bearing units for non-driven shaft [&] Integrated raceway [] a DAC bearing is press fit into two flanges

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