{"id":200,"date":"2026-06-12T05:11:02","date_gmt":"2026-06-12T05:11:02","guid":{"rendered":"https:\/\/planetary-gearboxes.cn\/?post_type=product&p=200"},"modified":"2026-06-12T05:11:02","modified_gmt":"2026-06-12T05:11:02","slug":"ep-wpbl-wpbf-series-high-precision-right-angle-planetary-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.cn\/ko\/%ec%a0%9c%ed%92%88\/ep-wpbl-wpbf-series-high-precision-right-angle-planetary-gearbox\/","title":{"rendered":"EP-WPBL\/WPBF Series High Precision Right-Angle Planetary Gearbox \u2014 \u22648 Arcmin, IP65, 90\u00b0 Output"},"content":{"rendered":"
\n

<\/p>\n

EP-WPBL\/WPBF High Precision Right-Angle Planetary Gearbox<\/h2>\n
\n
\n

The EP-WPBL\/WPBF occupies a unique position in the Korea Ever-Power planetary gearbox portfolio: it is the only series that combines high precision backlash (\u22648 arcmin), IP65 environmental sealing, and 90-degree right-angle output in a single unit. When your application demands both tight positional accuracy and perpendicular motor mounting, this is the series that eliminates the compromise.<\/p>\n

Internally, the EP-WPBL\/WPBF right-angle planetary gearbox uses the same upgraded gear quality and bearing class as the inline EP-PBL\/PBF high precision series, with a hardened spiral-bevel input stage that redirects the motor axis by 90 degrees. Three frame sizes \u2014 70, 90, and 120 \u2014 cover servo motor power from 50 W to 2,000 W across single-stage and two-stage configurations.<\/p>\n

The bevel input stage adds a small amount of angular play compared to the inline EP-PBL\/PBF, which is why the achievable backlash is \u22648 arcmin rather than \u22645 arcmin. This is a fundamental characteristic of right-angle planetary reducer architectures and represents the tightest backlash achievable in a 90-degree output configuration at this price point.<\/p>\n

Request a Quote \u2192<\/a><\/p>\n<\/div>\n

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\"EP-WPBL\/WPBF<\/p>\n

\n
\n
\u22648\u2032<\/div>\n
Backlash<\/div>\n<\/div>\n
\n
90\u00b0<\/div>\n
\uc0b0\ucd9c<\/div>\n<\/div>\n
\n
IP65<\/div>\n
\ubc00\ubd09\ub428<\/div>\n<\/div>\n
\n
280<\/div>\n
N.m Max<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

Where the EP-WPBL\/WPBF Fits \u2014 The Selection Matrix<\/h2>\n

Korea Ever-Power offers four planetary gearbox families across two axes: output direction (inline vs right-angle) and precision grade (standard vs high precision). The matrix below positions the EP-WPBL\/WPBF in context. If your application falls in the highlighted quadrant \u2014 requiring both 90\u00b0 output and \u22648 arcmin precision \u2014 this is the correct series.<\/p>\n

\"EP-WPBL_WPBF<\/p>\n

<\/p>\n

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PLANETARY GEARBOX SELECTION MATRIX<\/div>\n
\n

<\/p>\n

\n
<\/div>\n
INLINE OUTPUT<\/div>\n
RIGHT-ANGLE 90\u00b0<\/div>\n<\/div>\n

<\/p>\n

\n
STANDARD<\/div>\n
\n
EP-PL\/PF<\/div>\n
\u22648\u2032<\/div>\n
IP54 \u00b7 Fr 60\u2013160<\/div>\n<\/div>\n
\n
EP-WPL\/WPF<\/div>\n
\u226416\u2032<\/div>\n
IP54 \u00b7 Fr 60\u2013120<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

\n
PRECISION<\/div>\n
\n
EP-PBL\/PBF<\/div>\n
\u22645\u2032<\/div>\n
IP65 \u00b7 Fr 70\u2013120<\/div>\n<\/div>\n

<\/p>\n

\n
\u25b6 EP-WPBL\/WPBF<\/div>\n
\u22648\u2032<\/div>\n
IP65 \u00b7 90\u00b0 \u00b7 Fr 70\u2013120<\/div>\n<\/div>\n<\/div>\n<\/div>\n

Orange highlight = current page. The EP-WPBL\/WPBF is the only series offering both high precision and right-angle output.<\/p>\n<\/div>\n

If your installation permits inline mounting and tighter backlash is preferred, the EP-PBL\/PBF high precision planetary gearbox<\/a> achieves \u22645 arcmin at the same IP65 protection level. The EP-WPBL\/WPBF is the correct choice only when 90\u00b0 output is a non-negotiable installation constraint.<\/p>\n

<\/p>\n

Technical Specifications<\/h2>\n

All performance values apply equally to round flange (EP-WPBL) and square flange (EP-WPBF) models within the same frame. Only single-stage and two-stage planetary gearbox configurations are available in this high precision right-angle tier.<\/p>\n

\"EP-WPBL70 \"EP-WPBF70<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nEP-WPBL\/WPBF(70)<\/th>\nEP-WPBL\/WPBF(90)<\/th>\nEP-WPBL\/WPBF(120)<\/th>\n<\/tr>\n<\/thead>\n
Rated Output Torque (N.m)<\/td>\n22 \u2013 50<\/td>\n70 \u2013 135<\/td>\n125 \u2013 280<\/td>\n<\/tr>\n
Emergency Stop Torque (N.m)<\/td>\n66 \u2013 150<\/td>\n210 \u2013 405<\/td>\n375 \u2013 840<\/td>\n<\/tr>\n
Gear Ratios (1-stg \/ 2-stg)<\/td>\n3\u201310 \/ 12\u2013100<\/td>\n3\u201310 \/ 12\u2013100<\/td>\n3\u201310 \/ 12\u2013100<\/td>\n<\/tr>\n
Backlash (1-stg \/ 2-stg)<\/td>\n\u22648 \/ \u226410 arcmin<\/td>\n\u22648 \/ \u226410 arcmin<\/td>\n\u22648 \/ \u226410 arcmin<\/td>\n<\/tr>\n
Efficiency (1-stg \/ 2-stg)<\/td>\n\u226596% \/ \u226594%<\/td>\n\u226596% \/ \u226594%<\/td>\n\u226594% \/ \u226592%<\/td>\n<\/tr>\n
Noise Level<\/td>\n\u226465 dB(A)<\/td>\n\u226468 dB(A)<\/td>\n\u226470 dB(A)<\/td>\n<\/tr>\n
Torsional Stiffness (N.m\/arcmin)<\/td>\n7<\/td>\n14<\/td>\n25<\/td>\n<\/tr>\n
Protection \/ Life \/ Coupling<\/td>\nIP65 \u00b7 2,000 hours \u00b7 OP2 split-type (standard)<\/td>\n<\/tr>\n
Motor Shaft Diameter (mm)<\/td>\n6 \u2264 d \u2264 19<\/td>\n8 \u2264 d \u2264 22<\/td>\n14 \u2264 d \u2264 35<\/td>\n<\/tr>\n
Weight (1-stg \/ 2-stg)<\/td>\n2.3 \/ 2.8 kg<\/td>\n5.5 \/ 6.1 kg<\/td>\n15 \/ 17 kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

(1) Backlash tested at 2% of rated torque. (2) Noise measured at 3,000 rpm input, 1 m distance. (3) The EP-WPBL\/WPBF uses OP2 split-type coupling as standard. (4) Frame 120 efficiency is lower than Frame 70\/90 due to larger bevel gear contact loads.<\/p>\n

<\/p>\n

Precision Under Constraint \u2014 How the Bevel Stage Affects Accuracy<\/h2>\n
\n
\n

Every right-angle planetary gearbox adds a spiral-bevel gear pair to redirect the motor axis. This bevel stage inherently introduces additional angular play that stacks with the planetary stage backlash. Understanding this relationship is essential for correct specification:<\/p>\n

\n
\u25c6 Inline EP-PBL\/PBF<\/strong>: planetary stage only \u2192 \u22645 arcmin total
\n\u25c6 Right-angle EP-WPBL\/WPBF<\/strong>: bevel stage (~3 arcmin) + planetary stage (~5 arcmin) \u2192 \u22648 arcmin total
\n\u25c6 The 3-arcmin bevel contribution is the fundamental physics floor for a 90\u00b0 gear mesh at this precision tier<\/div>\n<\/div>\n

Korea Ever-Power minimises the bevel stage backlash contribution through precision spiral-bevel gear grinding (post-hardening), individual tooth contact pattern verification, and tapered roller bearing preloading. These measures compress the bevel-stage play to the theoretical minimum, ensuring the EP-WPBL\/WPBF consistently meets the \u22648 arcmin specification rather than merely averaging it.<\/p>\n

\u26a0 Selection Guidance:<\/strong> If your application requires \u22645 arcmin and can accommodate inline mounting, always specify the EP-PBL\/PBF. Reserve the EP-WPBL\/WPBF for installations where the 90\u00b0 output is physically necessary and \u22648 arcmin is sufficient for the positional accuracy requirement.<\/div>\n<\/div>\n
\"Planetary<\/div>\n<\/div>\n

<\/p>\n

Target Applications \u2014 Where Precision Meets Compact Layout<\/h2>\n

The EP-WPBL\/WPBF right-angle planetary gearbox serves a focused set of applications where both positional accuracy and perpendicular motor orientation are non-negotiable design requirements. Three representative scenarios illustrate the engineering rationale:<\/p>\n

\"High<\/p>\n

<\/p>\n

\n
Industrial Robot Joint Drives<\/div>\n

Six-axis articulated robots position their motors perpendicular to each joint axis to maintain a compact arm profile. The EP-WPBL70 at \u22648 arcmin provides the positional repeatability required for arc welding, palletising, and machine tending operations, while its IP65 sealing protects the planetary gearbox against weld spatter, coolant mist, and grinding dust. The 7 N.m\/arcmin torsional stiffness ensures rapid settling after each move, minimising cycle time in high-throughput production cells.<\/p>\n<\/div>\n

<\/p>\n

\n
AGV \/ AMR Precision Wheel Hub Modules<\/div>\n

Warehouse AGVs and autonomous mobile robots require precision path tracking while keeping the motor profile below the vehicle chassis line. The EP-WPBF80 right-angle planetary reducer mounts the servo motor horizontally within the chassis, driving the wheel through a 90\u00b0 output with \u22648 arcmin backlash. This accuracy level enables path deviation below \u00b15 mm at navigation speed, meeting the requirements of narrow-aisle warehouse and cleanroom transport applications. Pair with a drive shaft<\/a> for suspension-articulated wheel assemblies.<\/p>\n<\/div>\n

<\/p>\n

\n
Servo-Driven Press Brake Back Gauge<\/div>\n

CNC press brakes position the back gauge fingers along the X-axis using ball-screw drives that are perpendicular to the servo motor mounting surface. The EP-WPBL90 right-angle planetary gearbox at 10:1 ratio with \u22648 arcmin backlash achieves finger positioning repeatability within \u00b10.05 mm, meeting the tolerance requirements for precision sheet metal bending. The IP65 seal protects against hydraulic oil mist and metal particles common in press brake environments.<\/p>\n<\/div>\n

<\/p>\n

Manufacturing Quality & Korea Ever-Power Standards<\/h2>\n
\n
\n

Building a right-angle planetary gearbox to \u22648 arcmin requires both the planetary stage and the bevel stage to be individually held to tighter tolerances than their backlash contribution targets. At Korea Ever-Power, the EP-WPBL\/WPBF manufacturing process adds two critical steps beyond the standard right-angle EP-WPL\/WPF production:<\/p>\n

\u25c6 Post-hardening bevel gear grinding<\/strong> \u2014 the spiral-bevel gear pair is profile-ground after case hardening to remove heat-treatment distortion, achieving tooth surface finish below Ra 0.8 \u03bcm. This step is not performed on the standard-precision EP-WPL\/WPF bevel gears.
\n\u25c6 Individual bevel gear set matching<\/strong> \u2014 each pinion-and-gear pair is assembled, checked for contact pattern, and measured for backlash as a matched set. Only pairs that meet the target bevel-stage backlash proceed to final assembly.
\n\u25c6 Precision planetary gear train<\/strong> \u2014 identical to the EP-PBL\/PBF inline series: DIN\/JIS Class 5 ground planet gears, vacuum-degassed alloy steel blanks, HRC 58\u201362 case depth.
\n\u25c6 100% assembled-unit verification<\/strong> \u2014 every completed EP-WPBL\/WPBF is tested under load with backlash values recorded on an individual test certificate.
\n\u25c6 IP65 seal integrity test<\/strong> \u2014 dust and water-jet simulation per IEC 60529 before final packing.<\/div>\n<\/div>\n
\"Korea
\n\"Korea<\/div>\n<\/div>\n

<\/p>\n

Complementary Products & Ecosystem<\/h2>\n
\n
\"Korea<\/div>\n
\n

The EP-WPBL\/WPBF integrates into the wider Korea Ever-Power precision drive platform:<\/p>\n

\u25c6 EP-PBL\/PBF Series<\/strong> \u2014 Inline variant of this precision platform (\u22645 arcmin, IP65). Specify when installation depth permits and tighter backlash is preferred over right-angle output.
\n\u25c6 EP-WPL\/WPF Series<\/strong> \u2014 Standard-precision right-angle alternative (\u226416 arcmin, IP54). Select when the application tolerates wider backlash and IP65 sealing is not required.
\n\u25c6 EP-HAB Series<\/strong> \u2014 Ultra-precision inline gearbox (\u22643 arcmin) with the highest torsional stiffness in the portfolio for CNC and robotics applications requiring maximum positional accuracy.
\n\u25c6 Agricultural Gearbox<\/a><\/strong> \u2014 Heavy-duty right-angle and inline gearbox solutions for farming and off-highway equipment from the Ever-Power ecosystem.<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

What Our Customers Say<\/h2>\n
\n
\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n

\u201cWe integrate EP-WPBL70 units into our 6-axis collaborative robot arm joints. The 8-arcmin backlash delivers the repeatability our welding customers require, and the IP65 rating means we do not need additional sealing for automotive body-shop environments. Consistent quality across 200+ units delivered so far.\u201d<\/p>\n

Mr. Baek, CTO<\/strong> \u2014 Daegu, Korea \u00b7 Collaborative Robot Manufacturer<\/div>\n<\/div>\n
\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n

\u201cOur AGV fleet needed a right-angle gearbox that could handle precision path tracking in a semiconductor fab cleanroom. The EP-WPBF80 met both the accuracy requirement (\u22648 arcmin) and the particle containment need (IP65). Path deviation dropped from \u00b112 mm to \u00b14 mm after the upgrade. Excellent result.\u201d<\/p>\n

Dr. Nakamura, Automation Division<\/strong> \u2014 Kumamoto, Japan \u00b7 Semiconductor Fab Equipment<\/div>\n<\/div>\n
\n
\u2605\u2605\u2605\u2605\u2606<\/div>\n

\u201cThe EP-WPBL120 handles the 1.5 kW servo on our CNC press brake back gauge without issue. Positioning repeatability measured at \u00b10.04 mm over 10,000 cycles. Build quality is solid. Only suggestion: it would help to have a CAD model download on the website for faster integration into our machine design.\u201d<\/p>\n

Mr. Huang, Senior Engineer<\/strong> \u2014 Dongguan, China \u00b7 Sheet Metal Machinery<\/div>\n<\/div>\n
\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n

\u201cWe tested three brands of right-angle precision gearbox for our palletising robot wrist joint. The EP-WPBL90 had the best price-to-backlash ratio and passed our 5,000-hour accelerated life test without measurable backlash degradation. Now standardised across our entire robot product line for the ASEAN market.\u201d<\/p>\n

Pham Robotics<\/strong> \u2014 Hanoi, Vietnam \u00b7 Industrial Robot Assembly<\/div>\n<\/div>\n
\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n

\u201cSpecified EP-WPBF70 for our compact pick-and-place module. The square flange output simplifies mounting to our linear rail carriage, and the right-angle layout keeps the motor clear of the conveyor belt below. Backlash is within spec, noise is acceptable, and delivery to Bangkok was two weeks from order confirmation.\u201d<\/p>\n

Thai Precision Automation<\/strong> \u2014 Bangkok, Thailand \u00b7 Electronics Assembly<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

Frequently Asked Questions<\/h2>\n
\n
\n\u25b6 Why is the EP-WPBL\/WPBF backlash (\u22648 arcmin) wider than the EP-PBL\/PBF (\u22645 arcmin)?<\/summary>\n
The EP-WPBL\/WPBF adds a spiral-bevel input stage to redirect the motor axis by 90 degrees. This bevel gear mesh inherently introduces approximately 3 arcmin of angular play that stacks with the planetary stage. Even with precision-ground bevel gears and preloaded bearings, the 3-arcmin bevel contribution represents the physics floor for a 90\u00b0 gear mesh at this level. The total \u22648 arcmin is the tightest achievable backlash in a right-angle planetary gearbox configuration at this price tier.<\/div>\n<\/details>\n
\n\u25b6 Can the EP-WPBL\/WPBF be used in a continuous-rotation robot joint?<\/summary>\n
Yes. The EP-WPBL\/WPBF supports continuous rotation in both CW and CCW directions with no angular limitation. The grease lubrication system is designed for omni-directional operation, and the IP65 sealing maintains integrity during sustained rotation. For applications with frequent direction reversals, specify the OP4 reinforced coupling option instead of the standard OP2 to handle the cyclic clamping loads on the motor shaft.<\/div>\n<\/details>\n
\n\u25b6 What is the maximum radial and axial load capacity of the EP-WPBL\/WPBF?<\/summary>\n
Radial and axial load capacity varies by frame size and is measured at the output distance position when the output shaft rotates at 100 rpm. Typical permissible radial loads range from 500 N (Frame 70) to 2,050 N (Frame 120), and axial loads from 500 N to 2,050 N. Exact values depend on the gear ratio selected, as higher ratios reduce the output speed and thus the bearing dynamic load. Contact our engineering team with your specific load case for a confirmed capacity verification.<\/div>\n<\/details>\n
\n\u25b6 Is the EP-WPBL\/WPBF suitable for outdoor or washdown installations?<\/summary>\n
Yes. The IP65 protection grade provides complete dust-tightness and resistance to low-pressure water jets from any direction. This covers outdoor installations in tropical or coastal climates, food processing washdown areas, and environments with airborne particulates such as wood dust or metal filings. For applications involving high-pressure steam cleaning or temporary submersion, additional protective measures such as a drip shield or enclosure should be considered, as IP65 does not cover these conditions.<\/div>\n<\/details>\n
\n\u25b6 What is the difference between EP-WPBL (round flange) and EP-WPBF (square flange)?<\/summary>\n
The EP-WPBL and EP-WPBF share identical internal gear trains, bevel stage, bearings, seals, and performance specifications. The only difference is the output flange geometry: EP-WPBL uses a round bolt-circle flange, while EP-WPBF uses a square corner-bolt flange. Choose based on your machine frame mating interface. Round flanges are common in rotary joint applications, while square flanges suit linear-motion and carriage-mounted installations.<\/div>\n<\/details>\n
\n\u25b6 How quickly can Korea Ever-Power deliver EP-WPBL\/WPBF units?<\/summary>\n
Standard configurations with common ratios are typically available within 7\u201312 business days from our Ansan-si facility. Delivery to Korea and Japan is 3\u20135 days after dispatch; Southeast Asian destinations typically receive shipments within 7\u201310 days. Custom configurations (special shaft, non-standard ratio, or modified housing) require 15\u201325 business days. All units ship with individual backlash test certificates as standard.<\/div>\n<\/details>\n<\/div>\n

<\/p>\n

\n
Specify Your EP-WPBL\/WPBF Right-Angle Planetary Gearbox<\/div>\n

Tell us your motor model, required ratio, available installation envelope, and positional accuracy target. Our engineers will confirm the optimal EP-WPBL or EP-WPBF configuration within one business day.<\/p>\n

Contact Our Application Engineers \u2192<\/a><\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Korea Ever-Power EP-WPBL\/WPBF Series<\/strong>
\nThe high precision right-angle planetary gearbox that combines \u22648 arcmin<\/strong> backlash with 90\u00b0 output<\/strong> and IP65<\/strong> sealed protection. Frame sizes 70, 90, and 120 deliver rated output torque up to 280 N.m<\/strong> with torsional stiffness reaching 25 N.m\/arcmin. Available in round flange (EP-WPBL) and square flange (EP-WPBF) output. Standard OP2 split-type coupling. Engineered for industrial robotics, AGV wheel drives, and compact precision servo applications where both accuracy and perpendicular motor mounting are required.<\/div>","protected":false},"featured_media":220,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[16],"product_tag":[],"class_list":["post-200","product","type-product","status-publish","has-post-thumbnail","product_cat-high-precision-planetary-gearbox","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/product\/200","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/comments?post=200"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/media\/220"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/media?parent=200"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/product_brand?post=200"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/product_cat?post=200"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.cn\/ko\/wp-json\/wp\/v2\/product_tag?post=200"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}