{"id":1074,"date":"2026-06-24T03:16:19","date_gmt":"2026-06-24T03:16:19","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?p=1074"},"modified":"2026-06-24T03:16:19","modified_gmt":"2026-06-24T03:16:19","slug":"track-drive-planetary-gearbox-for-demolition-robots","status":"publish","type":"post","link":"https:\/\/planetary-gearboxes.com\/cs\/track-drive-planetary-gearbox-for-demolition-robots\/","title":{"rendered":"Track Drive Planetary Gearbox for Demolition Robots"},"content":{"rendered":"
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Korea Ever-Power \u00b7 Application Engineering \u00b7 Demolition Robots<\/p>\n

Track Drive Planetary Gearbox for Demolition Robots \u2014 Maximum Torque, Minimum Volume<\/h1>\n

The machine weighs 6 tonnes. The breaker hits with 2,000 joules. The track drive absorbs every reflected impact \u2014 600 to 1,200 times per minute \u2014 from a gearbox half the size of an excavator final drive. This is power density at its engineering limit.<\/strong><\/p>\n

Browse Track Drive Planetary Gearboxes \u2192<\/a><\/p>\n<\/div>\n<\/section>\n

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What Is a Demolition Robot \u2014 And Why Its Track Drive Is the Most Stressed Per Kilogram<\/h2>\n

A demolition robot (also known as a remote-controlled demolition machine) is a compact, electrically or hydraulically powered tracked machine designed to work where humans and full-size excavators cannot: inside buildings being demolished, in tunnels, in nuclear decommissioning zones, on elevated floors with weight restrictions, and in confined industrial spaces. The machines range from 1 to 12 tonnes \u2014 with the 3 to 6 tonne class being the most common.<\/p>\n

Ten\/Ta\/To track drive planetary gearbox<\/a> on a demolition robot must deliver the same performance characteristics as a 15 to 25 tonne excavator track drive \u2014 counter-rotation steering, gradeability, vibration resistance \u2014 but in a package that weighs 30 to 50% less and occupies 40 to 60% less volume. This is the definition of power density: more newton-metres per kilogram and per cubic centimetre than any other track drive application in the equipment industry.<\/p>\n<\/div>\n

\"Track<\/p>\n
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Compact track drive assembly: the same planetary gear principle as a 30-tonne excavator \u2014 but engineered to fit inside a 3-tonne demolition robot undercarriage.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Power Density \u2014 Why a 6-Tonne Robot Needs the Track Drive Torque of a 20-Tonne Excavator<\/h2>\n
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A 6-tonne demolition robot carries a hydraulic breaker rated at 1,500 to 2,500 joules \u2014 the same breaker class fitted to 18 to 25 tonne excavators. The robot achieves this mismatch through a higher power-to-weight ratio: 30 to 50 kW per tonne versus 8 to 12 kW per tonne on a standard excavator. The consequence for the track drive is severe: the machine generates forces disproportionate to its weight, and the track drive must handle these forces in a housing and gear set that is sized for the smaller machine footprint.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
Parametr<\/th>\n6 t Demolition Robot<\/th>\n20 t Excavator<\/th>\n<\/tr>\n<\/thead>\n
Engine\/motor power<\/td>\n120 \u2013 160 kW<\/td>\n110 \u2013 130 kW<\/td>\n<\/tr>\n
Power-to-weight ratio<\/td>\n20 \u2013 27 kW\/t<\/td>\n5.5 \u2013 6.5 kW\/t<\/td>\n<\/tr>\n
Breaker class<\/td>\n1,500 \u2013 2,500 J<\/td>\n1,200 \u2013 2,000 J<\/td>\n<\/tr>\n
Track drive torque<\/td>\n8,000 \u2013 18,000 Nm<\/td>\n28,000 \u2013 50,000 Nm<\/td>\n<\/tr>\n
Track drive weight<\/td>\n25 \u2013 55 kg<\/td>\n120 \u2013 200 kg<\/td>\n<\/tr>\n
Torque per kg of drive<\/td>\n320 \u2013 330 Nm\/kg<\/td>\n230 \u2013 250 Nm\/kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The demolition robot track drive achieves 30 to 40% higher torque-per-kilogram than a standard excavator track drive \u2014 the price of fitting excavator-class performance into a robot-class envelope.<\/p>\n<\/div>\n

\"Compact<\/p>\n
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Compact planetary reducer. Demolition robot track drives use similar 2 to 3 stage planetary architectures compressed into housings 40 to 60% smaller by volume than excavator equivalents.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

\"Track<\/p>\n
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Demolition robots operate where full-size excavators cannot: inside buildings, tunnels, and confined industrial spaces. The compact track drive must deliver full propulsion and steering capability within a machine footprint narrow enough to pass through a standard doorway.<\/p>\n<\/div>\n<\/div>\n

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Breaker Vibration \u2014 The Continuous Impact That Travels Through the Chassis to the Track Drive<\/h2>\n

A hydraulic breaker strikes 600 to 1,200 times per minute at 1,500 to 2,500 joules per blow. Each strike generates a vibration impulse that propagates through the boom, the turret, the chassis, and into the track drives. On a 20-tonne excavator, the large chassis mass attenuates this vibration before it reaches the track drives \u2014 the ratio of machine mass to impact energy is high. On a 6-tonne demolition robot, the ratio is 3 times lower \u2014 the vibration reaches the track drives at 3 times the amplitude per unit of machine mass.<\/p>\n

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Bearing Fretting<\/div>\n

The high-frequency vibration causes micro-oscillation of the planet pin bearings \u2014 the rollers rock back and forth without completing a full revolution. This “fretting” removes the oil film from a narrow band of the bearing raceway, producing a wear pattern (false brinelling) unique to vibration-loaded bearings. Over 2,000 to 4,000 hours, the fretting marks deepen into pits that propagate into spalling.<\/p>\n<\/div>\n

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Mounting Bolt Fatigue<\/div>\n

The continuous vibration at 10 to 20 Hz (breaker frequency) fatigues the track drive mounting bolts through preload relaxation and cyclic stress at the bolt head radius \u2014 the same mechanism that loosens trencher bolts, but at higher frequency and closer proximity to the vibration source. Without thread-locking compound, mounting bolts can loosen within 200 to 500 hours.<\/p>\n<\/div>\n<\/div>\n

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Vibration isolation is not possible:<\/strong> Unlike an engine (which is rubber-mounted to isolate vibration), the track drive is rigidly bolted to the track frame \u2014 it must be, because any compliance in the mounting would allow the sprocket to shift and derail the track. The track drive must be designed to withstand the transmitted breaker vibration as a continuous operating condition, not an occasional event.<\/p>\n<\/div>\n<\/div>\n

\"Heavy-duty<\/p>\n
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Robust bearing and housing structure. Robot track drives use full-complement needle bearings (no cage) for maximum radial capacity within the compact envelope.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Confined-Space Operation \u2014 Five Environments That Only Demolition Robots Can Enter<\/h2>\n
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Interior Demolition<\/div>\n

Inside buildings with floor load limits of 500 to 2,000 kg\/m2 \u2014 too low for any excavator but within the ground pressure range of a 3 to 6 tonne robot on wide tracks. The track drive must propel across concrete floors, over rebar, and through rubble piles in spaces as narrow as 800 mm.<\/p>\n<\/div>\n

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Tunnel and Underground<\/div>\n

Tunnel cross-sections, mine drifts, and underground chambers where ceiling height limits the machine to under 2 metres. The track drive must handle slopes of 10 to 25% on wet, uneven tunnel floors. Water ingress and high humidity accelerate seal and housing corrosion in underground environments.<\/p>\n<\/div>\n

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Nuclear Decommissioning<\/div>\n

Radiation-contaminated zones where human access is prohibited. The robot is controlled remotely, and the track drive must operate for the entire shift without manual intervention. Any track drive failure requires a contamination-controlled recovery operation that can cost 10 to 50 times the value of the gearbox itself.<\/p>\n<\/div>\n

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Metal Processing and Foundries<\/div>\n

Slag removal, furnace lining demolition, and ladle cleaning inside steel mills and foundries. Ambient temperatures of 40 to 60 degrees C at the machine level, with radiant heat from molten metal reaching 80+ degrees C at the track drive housing. The thermal environment approaches asphalt paver conditions \u2014 but with the added challenge of metal dust and slag particles.<\/p>\n<\/div>\n

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Process Plant Maintenance<\/div>\n

Cement kiln cleaning, chemical reactor vessel demolition, and refinery unit turnaround work. The track drive must propel through chemical residues, cement clinker, and process dust \u2014 corrosive and abrasive environments that combine the worst characteristics of Korea Ever-Power planetary gearbox<\/a> applications across multiple industries.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Three Failure Modes Specific to Demolition Robot Track Drives<\/h2>\n
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1<\/div>\n
Bearing false brinelling from continuous breaker vibration<\/div>\n<\/div>\n

The high-frequency micro-oscillation from the breaker (10 to 20 Hz, 600 to 1,200 impacts per minute) causes the planet pin bearing rollers to rock without rotating. This removes the oil film from a narrow contact band and produces a wear pattern identical to static indentation. After 2,000 to 4,000 hours, the false brinelling marks become deep enough to generate vibration and noise \u2014 and then propagate rapidly into full spalling.<\/p>\n

Prevention: Full-complement needle bearings (no cage) with EP synthetic oil. Consider solid bronze bushings for machines with breaker duty exceeding 60% of operating hours.<\/div>\n<\/div>\n
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2<\/div>\n
Housing fatigue cracking from vibration-amplified stress at the compact envelope<\/div>\n<\/div>\n

The compact housing has thinner walls than an excavator track drive of the same torque class \u2014 the volume constraint demands it. Thinner walls have less fatigue margin. The breaker vibration adds a continuous cyclic stress component on top of the static torque load. At stress concentration points (bolt holes, seal grooves, internal corners), the combined steady + cyclic stress can exceed the fatigue endurance limit of standard ductile iron within 3,000 to 5,000 hours.<\/p>\n

Prevention: Specify housings with radiused internal corners (no sharp transitions). Use QT600-3 or QT700-2 ductile iron for vibration-loaded applications. Inspect housing at 2,000-hour intervals using dye-penetrant testing.<\/div>\n<\/div>\n
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3<\/div>\n
Rubble and debris ingestion in confined-space environments<\/div>\n<\/div>\n

Demolition robots operate surrounded by the material they are demolishing \u2014 concrete chips, rebar fragments, brick dust, and plaster particles. The track drives, at ground level, are buried in this debris. Unlike outdoor construction (where wind and rain disperse debris), indoor demolition concentrates the debris around the machine with no natural clearance. Concrete dust is as abrasive as rock dust (Mohs 6 to 7) and combines with water from dust suppression systems to form an abrasive paste that accelerates seal wear.<\/p>\n

Prevention: Pressurised breathers. Heavy-duty seal guards. Oil change at 500 hours for indoor demolition. Clean the sprocket and seal area at every shift change \u2014 do not allow debris to accumulate between shifts.<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\"Multi-stage
\n\"ZR120<\/p>\n
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Multi-stage planetary architecture. Demolition robot drives use 2 to 3 stage configurations to achieve ratios of 50:1 to 120:1 within the compact housing envelope.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Track Drive Planetary Gearbox for Demolition Robots \u2014 Frequently Asked Questions<\/h2>\n
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Why do demolition robot track drives fail faster than excavator track drives at the same torque?<\/h3>\n

Three compounding factors: (1) the compact housing has thinner walls and smaller bearings than an excavator drive of the same torque, reducing the safety margin; (2) the breaker vibration produces continuous false brinelling damage on the planet bearings that no excavator experiences at the same frequency and amplitude; and (3) the confined-space operating environment concentrates abrasive debris around the track drive with no natural clearance. The combination reduces the typical service life to 2,000 to 4,000 hours \u2014 roughly half that of an excavator track drive at similar torque. Proactive maintenance (500-hour oil changes, vibration monitoring, dye-penetrant housing inspection at 2,000 hours) is essential to achieving the upper end of this range.<\/p>\n<\/div>\n

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Can I use a standard mini-excavator track drive on a demolition robot?<\/h3>\n

Only if the torque rating is matched and the vibration environment is considered. A mini-excavator track drive at the correct torque rating will fit mechanically \u2014 but mini-excavator drives are not designed for the continuous high-frequency breaker vibration that demolition robots produce. The standard caged needle bearings in a mini-excavator drive are more susceptible to false brinelling than the full-complement needles or bronze bushings specified for demolition duty. If a mini-excavator drive is used as a stop-gap, reduce the oil change interval to 500 hours and monitor for bearing noise at every shift start.<\/p>\n<\/div>\n

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What is the typical service life of a demolition robot track drive?<\/h3>\n

2,000 to 4,000 hours for breaker-intensive demolition work. 3,000 to 5,000 hours for concrete crushing, sorting, and material handling (lower vibration). Nuclear decommissioning and process plant work falls between these ranges depending on the proportion of breaker versus handling duty. The cost of track drive failure in nuclear or hazardous environments \u2014 where contamination-controlled recovery is required \u2014 makes proactive replacement at 2,500 to 3,000 hours the standard practice for risk-sensitive operators, regardless of the condition of the outgoing drive.<\/p>\n<\/div>\n

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How does the floor load limit affect track drive specification?<\/h3>\n

Indoor demolition on elevated floors requires the machine ground pressure to stay below the floor structural capacity \u2014 typically 500 to 2,000 kg\/m2 for reinforced concrete slabs. A 6-tonne robot on 400 mm wide tracks at 2.5 m length per side achieves approximately 3,000 kg\/m2 \u2014 too high for most elevated slabs. Wider tracks (500 to 600 mm) or longer track frames reduce the pressure to 2,000 to 2,500 kg\/m2. But wider and longer tracks require more torque from the track drive for steering (the counter-rotation friction area increases). The track drive specification must be coordinated with the track geometry \u2014 which is in turn constrained by the floor load limit. This is a three-way optimisation unique to indoor demolition robots.<\/p>\n<\/div>\n

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Does Korea Ever-Power supply compact track drives rated for breaker vibration?<\/h3>\n

Yes. Korea Ever-Power manufactures compact track drive planetary gearboxes for demolition robots from 3,000 to 18,000 Nm in housings designed for the power-dense envelope of 1 to 12 tonne remote-controlled machines. Full-complement needle bearings, vibration-rated QT600-3 housings with radiused internal geometry, and pressurised breather options are available for breaker-intensive service. Provide the robot manufacturer, model, breaker class, and primary operating environment (indoor\/outdoor\/nuclear) for a vibration-rated specification.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Demolition Robot Track Drives \u2014 Compact, Vibration-Rated, Power-Dense<\/div>\n

Korea Ever-Power provides demolition robot track drive planetary gearboxes from 3,000 to 18,000 Nm \u2014 the highest torque-per-kilogram in the track drive catalogue. Vibration-rated bearings, compact QT600-3 housings, and nuclear\/hazardous-environment specifications available. Provide your robot model and breaker class for a specification recommendation.<\/p>\n<\/div>\n

View Track Drive Range \u2192<\/a><\/p>\n
sales@planet\u00e1rn\u00ed-p\u0159evodovky.com<\/div>\n<\/div>\n<\/div>\n<\/section>\n

St\u0159iha\u010d: Cxm<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Korea Ever-Power \u00b7 Application Engineering \u00b7 Demolition Robots Track Drive Planetary Gearbox for Demolition Robots \u2014 Maximum Torque, Minimum Volume The machine weighs 6 tonnes. The breaker hits with 2,000 joules. The track drive absorbs every reflected impact \u2014 600 to 1,200 times per minute \u2014 from a gearbox half the size of an excavator […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[965],"tags":[],"class_list":["post-1074","post","type-post","status-publish","format-standard","hentry","category-application-and-technical-guid"],"_links":{"self":[{"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/posts\/1074","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/comments?post=1074"}],"version-history":[{"count":2,"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/posts\/1074\/revisions"}],"predecessor-version":[{"id":1077,"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/posts\/1074\/revisions\/1077"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/media?parent=1074"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/categories?post=1074"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/tags?post=1074"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}