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EP-OED01 Rear Axle Assembly

Heavy-duty complete rear axle assembly engineered for 15 kW 4WD platforms — supporting 2WD/4WD switching, differential lock, and high/low range gear selection.

Model: EP-OED01 | Rear Drive Axle Assembly

1. Technical & Performance Specifications

The table below lists 20 key technical parameters for the EP-OED01 rear axle assembly. Procurement engineers and workshop technicians are encouraged to cross-reference these against vehicle chassis documentation before specifying a complete rear axle assembly or planning a rear axle assembly replacement project.

พารามิเตอร์	Value	Unit / Notes
Max Input Torque (T max)	180	N.m
Max Input Rotation Rate (n max)	7,500	r/min
Gear Ratio — High Range (U)	11.28 : 1	2WD/4WD highway mode
Gear Ratio — Low Range (U)	22.12 : 1	4WD off-road / crawl mode
Centre-to-Centre Spacing (A)	250.25	mm
Max Transmission Efficiency	≥ 96	%
Overall Length	492	mm
Axle Track Width	517	mm
Overall Height	321	mm
Assembly Weight	46.75	kg
Input Spline Type	Internal Spline	Module m=1, z=23, α=30°, x=−0.2
Output Spline Type	Internal Spline	Module m=1.05833, z=27, α=45°
Differential Type	Bevel-Gear Open + Lockable	Rear differential axle assembly
Drive Mode Switching	2WD / 4WD selectable	Manual shift-on-the-fly
Applicable Power	15	kW nominal
Lubrication System	Sealed splash oil bath	Gear oil GL-5 80W-90
NVH Performance Level	≤ 68	dB(A) at 4,000 r/min
ช่วงอุณหภูมิการทำงาน	−30 to +120	°C
Quality Certification	IATF 16949:2016	Automotive QMS
Endurance Test Standard	500 h bench test	Full-load durability cycle

automatictransmissionpart-products-EP-OED01 Rear Axle Assembly-draft

2. What Is the Rear Axle Assembly?

A rear axle assembly is the structural and mechanical subassembly at the rear of a vehicle responsible for transmitting engine torque to the rear drive wheels. It encompasses the rear axle housing, differential carrier, crown wheel and pinion set, axle shafts, bearings, seals, and all associated mounting hardware. When people ask “What is the rear axle assembly?”, the short answer is: it is the complete drivetrain unit that converts rotational force from the driveshaft into lateral wheel rotation, enabling movement. In four-wheel-drive vehicles, the rear axle assembly also plays a decisive role in traction management, working in concert with a front axle and transfer case.

The EP-OED01 is precisely this kind of rear end axle assembly — a bolt-in, fully tested unit shipped ready for installation. It is currently deployed in 15 kW 4WD platforms where the powertrain must handle both on-road commuting and off-road terrain. The design supports selectable 2WD and 4WD modes, a lockable differential for maximum traction, and a high/low range transfer function, making it one of the more versatile rear wheel axle assemblies on the market for compact utility vehicles and UTVs.

3. Five Key Advantages of the EP-OED01

1. Dual-Mode Gear Ratio

The selectable gear ratios of 11.28:1 (high range) and 22.12:1 (low range) allow operators to optimise between fuel efficiency on paved roads and maximum pulling torque on sand, gravel, or muddy terrain — an essential feature for off-road utility vehicles and rear ATV axle assembly applications in Bahrain’s mixed terrain environment.

2. Integrated Differential Lock

A built-in locking differential eliminates wheel spin on unequal surfaces. When engaged, torque is distributed equally to both rear wheels rather than defaulting to the path of least resistance. This feature is critical for the rear differential axle assembly under heavy load or slippery conditions, and reduces the risk of drivetrain overload that leads to premature rear axle assembly replacement.

3. Compact, Lightweight Construction

Weighing only 46.75 kg with an envelope of 492 × 517 × 321 mm, the EP-OED01 delivers a high torque-to-weight ratio suited to sub-1,000 cc utility platforms. The compact rear axle housing reduces unsprung mass, improving ride comfort and steering response — factors that distinguish a premium rear complete axle assembly from cheaper alternatives.

4. Precision-Machined Spline Interfaces

Both the input and output ends use internal splines machined to tight tolerances — module 1 / 23-tooth at the input and module 1.05833 / 27-tooth at the output. A 45° pressure angle at the output minimises axial thrust while maximising load-carrying capacity, contributing to the extended service life that makes owners less likely to need an expensive rear axle assembly replacement.

5. IATF 16949 Certified Manufacturing

Every unit passes through an online comprehensive performance test bench before shipment. The production facility holds IATF 16949:2016 certification — the highest quality standard recognised in the automotive industry — giving procurement engineers in Bahrain, Saudi Arabia, and the wider GCC region the assurance that each rear axle assembly meets documented process controls and dimensional verification.

4. How the Rear Axle Assembly Works

Understanding the working principle of a rear axle assembly starts at the driveshaft. Engine torque travels along the propeller shaft and enters the EP-OED01 through the input spline (23-tooth, module 1, 30° pressure angle). Inside the rear axle gearbox, a helical gear set reduces this rotational speed while multiplying torque. At high range (U = 11.28:1) the unit outputs moderate torque suitable for normal driving; shifting to low range (U = 22.12:1) roughly doubles the mechanical advantage, critical for climbing steep inclines or extracting a bogged vehicle.

The multiplied torque then enters the bevel-gear differential, which splits the drive equally between the left and right axle shafts under normal conditions. Each axle shaft connects to the wheel hub via the output spline (27-tooth, module 1.05833, 45° pressure angle). When the vehicle turns, the differential allows the outer wheel to rotate faster than the inner wheel, eliminating tyre scrub. Activating the differential lock mechanically couples the two output shafts, forcing identical rotational speeds — invaluable when one wheel loses traction entirely.

The entire drivetrain package — from input spline through differential to output flanges — is enclosed within a die-cast aluminium rear axle housing. Oil lubrication is maintained by a sealed splash system; the housing features dedicated oil inlet ports sized to match common fill-and-drain procedures. This design ensures that components of the rear axle assembly such as bearings, gears, and seals remain protected under sustained high-torque operation up to the rated 7,500 r/min input speed.

5. Materials & Metallurgy

Material selection directly determines how long a rear axle assembly lasts in the field. The EP-OED01 uses a carefully specified material stack derived from proven ATV and UTV drivetrain experience:

Gear Set (Crown Wheel & Pinion, Differential Side Gears): Case-hardening alloy steel 20CrMnTi, carburised and quenched to surface hardness HRC 58–62. This material is equivalent to the European EN 10084 specification and is routinely used in automotive-grade rear axle gearbox components where both surface wear resistance and core toughness are required simultaneously. Tooth profiles are ground to DIN 3960 Class 5 accuracy after heat treatment.

Axle Shafts: Medium-carbon alloy steel 42CrMo4 (equivalent to SAE 4140), induction-hardened along the spline and fillet zones. The material provides tensile strength exceeding 900 MPa and high torsional fatigue resistance — essential for the rear wheel axle assembly under repeated torque reversals during off-road use.

Housing / Casing: High-pressure die-cast ADC12 aluminium alloy (equivalent to EN AC-47100), treated with a corrosion-resistant epoxy primer. The aluminium construction reduces the overall weight of the rear axle housing compared to cast-iron designs while maintaining sufficient rigidity under bending loads from wheel braking forces.

Bearings: Tapered roller bearings to ISO 355 dimensions at all shaft positions, sourced from ISO 9001-certified suppliers. Bearing preload is set on the assembly line using a calibrated torque wrench and verified on the online performance test bench before dispatch.

Seals & Gaskets: Fluoroelastomer (FKM/Viton) shaft seals rated for continuous operation at 120 °C. This choice is deliberate for markets with hot climates — particularly relevant for Bahrain, Qatar, and the UAE where under-bonnet temperatures regularly exceed 90 °C during summer operation.

6. Application Scenarios

The EP-OED01 rear axle assembly is a versatile platform. Below are the primary use cases where this rear complete axle assembly delivers measurable performance advantages.

UTV / Side-by-Side Off-Road Vehicles

The UTV rear axle assembly configuration is the primary target application. Utility terrain vehicles operating on dunes, desert tracks, and rocky trails in Bahrain, Saudi Arabia, and Oman place high cyclic loads on the rear drivetrain. The EP-OED01’s 180 N.m torque rating and lockable differential provide the torque multiplication and traction control these environments demand, while the compact housing clears typical UTV chassis cross-members without modification.

ATV / Quad-Bike Platforms

For rear ATV axle assembly replacement projects, the EP-OED01 is a practical upgrade or OEM equivalent option. Its 250.25 mm centre-to-centre spacing and standardised spline dimensions align with common ATV frame mounting points. The dual gear ratio selector extends the vehicle’s capability from trail riding to agricultural and patrol duties, without requiring chassis modifications or custom driveshaft fabrication.

Light Electric Utility Vehicles

With growing adoption of 15 kW electric drive platforms across campus logistics, port operations, and resort management, the rear CV axle assembly demand in this segment is expanding rapidly. The EP-OED01 accepts standard flanged motor couplings and has been validated at the rated input speed of 7,500 r/min, which corresponds to common permanent magnet motor operating ranges. Its low-range ratio of 22.12:1 provides enough torque multiplication to climb ramps without oversizing the motor.

Agricultural & Survey Vehicles

Small tractors, survey buggies, and orchard carriers used in arid or semi-arid farming environments require a rear drive axle assembly capable of handling uneven ground loads and sustained low-speed operation. The EP-OED01’s sealed splash lubrication eliminates the need for pressurised oil systems, reducing maintenance intervals and parts inventory. The high operating temperature threshold of 120 °C is particularly well matched to outdoor agricultural applications in the Gulf region.

Military & Security Patrol Platforms

Security and border patrol agencies in the GCC region increasingly specify compact 4WD vehicles equipped with proven drivetrain components. The EP-OED01’s dual-range capability, lockable differential, and robust alloy steel gear set make it a credible option for light patrol vehicle procurement. Units are subject to a 500-hour full-load bench endurance cycle prior to approval for this segment, providing independent verification beyond standard commercial axle assembly testing.

Rear axle assembly application in off-road vehicle production

7. Regulatory Compliance & Industry Standards

Procurement of drivetrain components in Bahrain and across the GCC region involves navigating a layered set of national and international standards. Buyers sourcing a rear axle assembly for commercial or government use should confirm that their chosen supplier’s documentation covers the following frameworks:

GCC / Bahrain (GSO Standards): The Gulf Standards Organisation (GSO) has adopted GSO 40 and associated vehicle safety technical requirements, aligned with UN ECE regulations. Vehicles incorporating a complete rear axle assembly must demonstrate compliance with GSO/ASTM load capacity and materials traceability requirements. The Bahrain Authority for Culture & Antiquities (BACA) and the Ministry of Industry & Commerce enforce product conformity marks for automotive parts intended for sale in the Kingdom of Bahrain. Importers should obtain GSO-approved test reports and a valid Certificate of Conformity.

European Union: Under EU Regulation 2018/858 (replacing 2007/46/EC), any axle assembly fitted to a type-approved vehicle in the EU must comply with the applicable whole-vehicle type approval. For off-road machines (category T/L/S), Directive 97/68/EC and its Regulation (EU) 2016/1628 on non-road mobile machinery emissions may also be relevant. Component suppliers must maintain an IATF 16949 or equivalent ISO 9001:2015 quality system and, where required, obtain CE marking under the applicable New Approach Directives.

United States: The Federal Motor Vehicle Safety Standards (FMVSS), administered by NHTSA, do not prescribe specific axle assembly design requirements but set vehicle-level safety performance targets that drivetrain components must support. The Society of Automotive Engineers (SAE) standards SAE J706 (axle terminology), SAE J1297 (ATF lubricants), and SAE J3061 (cybersecurity for connected vehicles) provide the engineering framework for specifying and evaluating rear axle assembly parts. AGMA 2001 governs gear tooth strength calculations.

ISO & Automotive Industry: The EP-OED01 production facility holds IATF 16949:2016 — the automotive sector’s equivalent of ISO 9001 with additional requirements for DFMEA, PFMEA, control plans, and MSA. Gear elements are designed in accordance with ISO 6336 (load capacity of spur and helical gears) and ISO 1328 (gear accuracy). Shaft spline dimensions conform to ISO 4156 (involute splines). These certifications are available to qualified buyers on request and can be submitted to Bahrain Customs and GSO conformity assessment bodies.

8. About Us

We are a high-technology manufacturer specialising in ATV/UTV front and rear axle transmission assemblies, new energy vehicle reduction gear units, and related drivetrain components. Founded in 2005, our operation has grown from a focused axle transmission workshop into a multi-site manufacturing enterprise with production bases, a city-level technology centre, and an international business development office. Over two decades, we have shipped more than 500,000 drivetrain units to vehicle manufacturers in China and across international export markets, accumulating deep engineering experience in rear axle assembly design, validation, and manufacture.

The facility operates an intelligent automated assembly line, online comprehensive performance test benches, and over twenty prototype and pilot-build machines. CAE structural analysis, 1D drivetrain simulation, and 3D transmission design tools are deployed at the concept stage for every new rear complete axle assembly development, ensuring that design intent is verified digitally before any metal is cut. Our quality system is certified to IATF 16949:2016 by DNV·GL and we hold multiple national utility and invention patents across gear systems and differential designs. Recognised honours include being named an Advanced Unit for Energy Conservation, a Safety Production Standardised Enterprise (Grade 3), and a Strategic Supplier by multiple OEM vehicle manufacturers.

เวิร์กช็อป

9. Related Products & System Compatibility

We supply the full drivetrain ecosystem around the EP-OED01 rear axle assembly, enabling one-stop procurement and guaranteed system compatibility. The two accessories below are commonly ordered alongside this rear axle assembly for complete UTV and ATV drivetrain builds.

Wheel Bolts

Precision-machined wheel bolts designed to match the EP-OED01 hub flange bolt-circle diameter and thread pitch. Using mis-matched wheel bolts on a rear wheel axle assembly is one of the most common installation errors that leads to premature loosening under vibration. Our wheel bolts are made from grade 10.9 alloy steel and are batch-tested for tensile strength and thread accuracy before shipment. Pairing OEM-specification bolts with the complete rear axle assembly eliminates one variable in warranty claims and reduces the risk of wheel separation in service.

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Trailer Axle Beam / Trailer Spindle

Operators running a UTV rear axle assembly in agricultural or towing applications frequently ask about companion trailer axle components. Our trailer axle beams and spindles are manufactured to compatible load ratings and hub bolt-circle patterns, making it straightforward to spec a tow-behind trailer that harmonises with the EP-OED01’s rated towing capacity. Consistent metallurgy and surface treatment across your rear axle assembly parts list reduces inspection overhead and simplifies re-ordering. This is the kind of one-stop-supply advantage that distinguishes a specialist drivetrain manufacturer from a generic parts distributor.

ผลิตภัณฑ์ที่เกี่ยวข้องกับเกียร์อัตโนมัติ - คานเพลาล้อรถพ่วง - แกนล้อรถพ่วง

คำถามที่พบบ่อย

Q1. What is the rear axle assembly and why does it matter so much in a 4WD UTV operating in Bahrain’s desert terrain?

The rear axle assembly is the entire structural and mechanical unit at the rear of the vehicle that transmits engine or motor torque to the rear drive wheels. In a Bahrain desert environment, it also handles shock loads from rocks and deep sand, supports braking forces, and — in the case of the EP-OED01 — provides differential lock for maximum traction. Without a correctly rated rear axle assembly, the drivetrain becomes the weak point that fails first under off-road stress.

Q2. Is replacing a rear axle a big job, and how do I remove a rear axle assembly from a compact 4WD UTV?

For a trained workshop technician, replacing the EP-OED01 rear axle assembly typically takes 3–5 hours on a vehicle fitted with standard suspension. The process involves: draining the axle oil; disconnecting the propeller shaft at the pinion flange; unbolting the trailing arm mounts and shock absorber lower eyes; removing the brake callipers and wheel hub assemblies; then lowering the complete rear axle assembly on a transmission jack. Reinsertion reverses the sequence. Using OEM-specification fastener torque values during reassembly is essential — improper torquing of the differential pinion nut is the most common error after DIY rear axle assembly replacement.

Q3. How does the EP-OED01 rear axle gearbox compare to a standard open differential in terms of traction on loose sand?

A standard open differential rear axle gearbox will direct all torque to whichever wheel has the least traction — exactly the wrong behaviour in deep sand or gravel. The EP-OED01’s lockable differential eliminates this limitation by mechanically coupling both outputs. When locked, the rear differential axle assembly behaves as a solid axle for traction purposes, forcing both rear wheels to rotate at identical speeds regardless of grip variation. This makes the EP-OED01 significantly more capable in loose terrain than a comparable rear end axle assembly fitted with only an open differential.

Q4. Where can I find a reliable rear axle assembly parts supplier who stocks differential gears, axle shaft seals, and bearing kits for the EP-OED01?

We supply a complete range of rear axle assembly parts for the EP-OED01, including differential bevel gears, tapered roller bearing sets, FKM axle shaft seals, and spline shaft hardware. All service parts carry the same material certification as the original unit. For buyers in Bahrain, our parts can be shipped FOB or CIF Khalifa Bin Salman Port with standard lead times of 10–15 working days for regular stock items. Contact our after-sales department with your serial number and the components of rear axle assembly you require for a parts-specific quote.

Q5. Is it expensive to replace a rear axle assembly on a 15 kW electric UTV purchased in the GCC, and what drives the cost difference between suppliers?

The cost of rear axle assembly replacement in the GCC market varies widely. Key cost drivers include: the unit price of the complete rear axle assembly itself; the labour rate at the service facility; whether suspension and brake components must also be replaced at the same time; and freight and customs duty from the country of origin. Sourcing an IATF-certified unit with full documentation often costs more upfront than a non-certified alternative, but it reduces the risk of warranty disputes and unexpected re-replacement within the first service interval — which ultimately makes the certified route less expensive over a 3-year total cost of ownership calculation.

Q6. When should I specify a rear CV axle assembly versus a solid rear axle assembly for an independent suspension UTV build?

A rear CV axle assembly suits independent rear suspension (IRS) designs where each wheel moves vertically through its own travel path independent of the other. The constant-velocity joint compensates for the angular misalignment that results. A solid rear axle assembly — such as the EP-OED01 — is preferred in beam axle or live axle layouts where both wheels share a single housing and the entire axle moves as a unit with the suspension. Beam-axle designs are generally more robust under high shock loads and better for off-road torque distribution, while IRS layouts offer superior on-road handling and independent wheel travel.

Q7. How do I know which rear axle assembly is the right fit for my specific UTV or ATV model year and frame type?

The most reliable approach is to match three parameters: (1) the differential centre-to-centre spacing — the EP-OED01 uses 250.25 mm; (2) the output spline specification — 27-tooth, module 1.05833, 45° pressure angle; and (3) the propeller shaft flange bolt circle and flange diameter at the pinion end. If all three match your existing rear wheel axle assembly, the EP-OED01 is likely a direct replacement. Our technical team can review your existing drawing or a dimensional sketch and confirm compatibility before you commit to a purchase order.

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EP-OED01 Rear Axle Assembly

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