{"id":1051,"date":"2026-08-18T09:16:48","date_gmt":"2026-08-18T09:16:48","guid":{"rendered":"https:\/\/superiortransmissioninc.com\/?p=1051"},"modified":"2026-08-18T09:16:48","modified_gmt":"2026-08-18T09:16:48","slug":"single-speed-reducers-for-drill-rig-rotary-head-drives-bearing-reverse-impact-loads","status":"publish","type":"post","link":"https:\/\/superiortransmissioninc.com\/ja\/application\/single-speed-reducers-for-drill-rig-rotary-head-drives-bearing-reverse-impact-loads\/","title":{"rendered":"Single-Speed Reducers for Drill Rig Rotary Head Drives Bearing Reverse Impact Loads"},"content":{"rendered":"
\n
\n

Mining & Quarrying \u00b7 Technical Reference<\/p>\n

An engineering reference for drill rig designers, OEM procurement engineers, and maintenance specialists in open-pit blasthole drilling, geotechnical investigation, and quarry perforation operations across Australia, Canada, South Africa, the United States, and Europe.<\/p>\n<\/div>\n

<\/p>\n

\n

The rotary head drive of a drill rig \u2014 whether a surface blasthole machine, a sonic drill, a reverse-circulation rig, or a geotechnical investigation unit \u2014 subjects its transmission to a category of loading that very few other mining drive applications impose: reverse impact. When a tricone bit or DTH hammer encounters a hard formation boundary, a buried boulder, or a change in rock competency, the rotational resistance of the drill string can reverse abruptly. The drive train decelerates, then the reaction of the rotating drill string mass attempts to back-drive the head through the reducer. The torque direction reverses within milliseconds, applying a load to the back-face of the gear teeth that may be significantly higher than the rated forward torque \u2014 particularly if the string inertia is large.<\/p>\n

This loading mode is what distinguishes drill rig rotary head specification from most other \u30b7\u30f3\u30b0\u30eb\u30b9\u30d4\u30fc\u30c9\u6e1b\u901f\u6a5f<\/strong> applications. Standard catalogue selection based on forward rated torque and a moderate service factor is insufficient. The reducer must be evaluated for back-drive torque capacity, tooth-face compliance under load reversal, housing stiffness under reverse loading, and bearing axial capacity to handle the thrust reversal that accompanies direction change in a helical or worm gear mesh. This article covers each of these engineering requirements and identifies the EP-WPKA and EP-WPKS series as reference products for the mid-to-heavy end of the drill rig rotary head drive market.<\/p>\n<\/div>\n

<\/p>\n

\n

The Mechanics of Reverse Impact in a Rotary Head Drive Train<\/h2>\n

In forward drilling, the rotary head motor accelerates the drill string to operating speed and maintains torque against the formation resistance. The motor current is relatively stable, the gear teeth carry load on their drive faces, and the bearing system handles a steady combination of radial (gear mesh separation force) and axial (worm gear thrust) loads. This is the condition for which the \u30b7\u30f3\u30b0\u30eb\u30b9\u30d4\u30fc\u30c9\u6e1b\u901f\u6a5f<\/strong> catalogue rating applies.<\/p>\n

Reverse impact occurs in three distinct scenarios. The first is bit drop: when a drill breaks through a hard layer into a void or soft formation, the formation resistance drops abruptly, the string accelerates, and the motor \u2014 still commanding torque \u2014 overspeeds momentarily before the control system responds. The second is string stall: the bit jams in a crevice, the string torsional stiffness absorbs energy until the torsional spring-back releases it in the reverse direction at high angular velocity. The third is tool pullout: withdrawing a stuck drill string from a formation grip point releases elastic strain energy stored in the string as torsion, spinning the string in reverse at several times the forward drilling speed. All three scenarios impose reverse torque on the \u30b7\u30f3\u30b0\u30eb\u30b9\u30d4\u30fc\u30c9\u6e1b\u901f\u6a5f<\/strong> that may reach 1.5\u20133.0 times the rated forward torque, at angular velocities that engage the gear tooth back-faces with an impact rather than a gradual contact. Specifying a reducer that accounts for all three requires both a correct service factor and attention to the specific structural features that govern back-drive performance.<\/p>\n<\/div>\n

<\/p>\n

\"Worm<\/div>\n

<\/p>\n

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Manufacturing Structure \u2014 What Makes a Reducer Suitable for Reverse Impact<\/h2>\n

A \u5358\u901f\u30a6\u30a9\u30fc\u30e0\u30ae\u30a2\u6e1b\u901f\u6a5f<\/strong> intended for drill rig rotary head service differs from a standard catalogue unit in several structural details. The worm shaft is manufactured as a one-piece integral forging rather than a built-up assembly, ensuring that the shaft-to-worm joint does not relax under the cyclic torque reversals of drilling service. The worm thread is hobbed and then precision-ground on both flanks \u2014 both the drive flank (which carries forward drilling torque) and the coast flank (which carries reverse impact torque) \u2014 to the same surface finish and profile accuracy. In a standard low-duty reducer, only the drive flank is ground to close tolerances; in a drill rig unit, the coast flank must carry nearly equivalent load and must therefore be prepared to the same quality.<\/p>\n

The worm wheel tooth ring is centrifugally cast in high-tin phosphor bronze for maximum uniformity of the alloy microstructure \u2014 porosity or inclusion concentrations in a sand-cast ring create stress-concentration sites that initiate fatigue cracks under the repeated load reversals of drill rig service. The housing is ribbed ductile iron, machined in a single chucking to ensure the worm shaft bore, worm wheel bore, and all mounting faces are precisely co-axial and perpendicular. Critically, the bearing selection for a drill rig reducer must account for the axial thrust reversal that accompanies torque reversal in a worm gear mesh: both input and output bearing sets must be specified as paired angular-contact or spherical roller bearings capable of carrying design thrust in both directions rather than the single-direction deep-groove bearings sufficient for unidirectional conveyor drives.<\/p>\n<\/div>\n

<\/p>\n

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Material System for Reverse-Impact Drill Rig Service<\/h2>\n
\n
\n
Worm Shaft \u2014 18CrNiMo7-6 Carburised Steel<\/div>\n

Nickel-chromium-molybdenum alloy steel provides both the case hardness (HRC 60\u201362 after carburising and grinding) needed for worm flank contact fatigue life and the core toughness (core hardness HRC 32\u201338) needed to absorb the bending shock of reverse impact loading without brittle fracture. Both drive and coast flanks are ground to Ra 0.4 \u00b5m or better.<\/p>\n<\/div>\n

\n
Worm Wheel \u2014 Centrifugally Cast ZCuSn10Pb1<\/div>\n

High-tin phosphor bronze (10% Sn, 1% Pb) centrifugally cast for dense, uniform microstructure. The tin content provides compressive yield strength adequate for the elevated contact stress of reverse-load engagement, and the lead addition improves the emergency dry-running tolerance that protects the wheel during the brief periods of mixed lubrication at cold start or after a long idle period \u2014 common on drill rigs that run intermittently between formation changes.<\/p>\n<\/div>\n

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Housing \u2014 GGG50 Ductile Iron with External Ribs<\/div>\n

Ductile iron (minimum tensile strength 500 MPa, elongation 7%) provides the fracture toughness to survive repeated shock loading without crack initiation at stress concentrations \u2014 a property that grey cast iron lacks at equivalent wall thickness. External ribs increase torsional stiffness without adding mass, limiting the elastic deformation of the housing under reverse torque peaks that would otherwise cause misalignment between the worm and wheel during the transient.<\/p>\n<\/div>\n

\n
Bearings \u2014 Paired Angular-Contact Ball or Spherical Roller<\/div>\n

Standard catalogue reducers use deep-groove ball bearings optimised for radial load with limited axial capacity in one direction. Drill rig service requires bidirectional axial load capacity: paired face-to-face angular-contact ball bearings (15\u00b0\u201325\u00b0 contact angle) for lighter frame sizes, or spherical roller bearings with a floating\/fixed arrangement for larger frames where the worm shaft thrust forces require higher axial dynamic capacity than ball bearings provide.<\/p>\n<\/div>\n

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Sealing \u2014 V-Ring Plus Radial Lip Seal<\/div>\n

Drill rigs operate in environments with airborne formation dust (silica, coal, mineral particulate) that is highly abrasive to shaft seals. A V-ring pre-seal in front of a PTFE-lipped radial shaft seal provides two barriers against dust ingress: the V-ring excludes the bulk of the particulate, protecting the lip seal from the abrasion that shortens its service life to unacceptable intervals in single-seal arrangements used in standard catalogue reducers.<\/p>\n<\/div>\n

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Coating \u2014 Two-Component Epoxy-Polyurethane<\/div>\n

The external housing surface receives an epoxy primer (80 \u00b5m DFT) followed by an aliphatic polyurethane topcoat (60 \u00b5m DFT), selected for resistance to the diesel fuel, hydraulic oil mist, and alkaline or acid drilling flush water that covers most drill rig drive system surfaces in service. This coating system outlasts standard single-component alkyd paint by a factor of 3\u20135 in field service on drill rigs operating in Australian, South African, and North American mine sites.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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Service Factor Guidelines for Drill Rig Rotary Head Reducer Selection<\/h2>\n

The table below provides service factor guidance for \u30a6\u30a9\u30fc\u30e0\u30ae\u30a2\u6e1b\u901f\u6a5f<\/strong> used in drill rig rotary head applications. These factors are additive: the applicable factors for an installation are summed and applied to the motor rated power before entering the reducer torque-capacity table. The resulting corrected power is the figure used to select the reducer frame size and output torque rating from the \u30b7\u30f3\u30b0\u30eb\u30b9\u30d4\u30fc\u30c9\u6e1b\u901f\u6a5f<\/strong><\/a> product range.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n
Loading Condition<\/th>\nService Factor Addition<\/th>\nTypical Drill Application<\/th>\n<\/tr>\n<\/thead>\n
Base \u2014 smooth, uniform, no shock<\/td>\n1.00<\/td>\nNot applicable for drill rigs<\/td>\n<\/tr>\n
Moderate shock, 2\u20135 starts\/hour<\/td>\n+0.25<\/td>\nGeotechnical investigation, soft formation sonic drill<\/td>\n<\/tr>\n
Heavy shock, >5 starts\/hour<\/td>\n+0.50<\/td>\nOpen-pit blasthole rotary drilling, hard rock<\/td>\n<\/tr>\n
Frequent torque reversal (bit drop or string stall)<\/td>\n+0.50<\/td>\nAll reverse-impact drill rig rotary head drives<\/td>\n<\/tr>\n
Ambient temperature >40 \u00b0C<\/td>\n+0.25 per 10 \u00b0C above 40 \u00b0C<\/td>\nSurface rigs in Australia, Chile, South Africa desert sites<\/td>\n<\/tr>\n
Ambient temperature <\u201310 \u00b0C (cold-start viscosity)<\/td>\n+0.25<\/td>\nCanadian and Northern European drill rig winter operation<\/td>\n<\/tr>\n
Non-horizontal mounting (oil distribution effect)<\/td>\n+0.10\u20130.25<\/td>\nAngled drill mast, off-horizontal head rotation axis<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

<\/p>\n

\u30b7\u30f3\u30b0\u30eb\u30b9\u30d4\u30fc\u30c9\u6e1b\u901f\u6a5f<\/a><\/div>\n

<\/p>\n

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Recommended Products for Drill Rig Rotary Head Drives<\/h2>\n
\n
\"EP-WPKA<\/p>\n
\n

EP-WPKA Single Speed Reducer (5 \u2013 260 kg)<\/h3>\n

\u306e EP-WPKA<\/strong> hollow-shaft configuration connects the reducer directly to the drill head drive shaft through a keyed or shrink-fit bore, eliminating the external coupling that is frequently the first component to fail under the alternating shock loads of a rotary head drive. The hollow shaft design positions the reducer closer to the drill head centreline than a solid-shaft-plus-coupling arrangement, reducing the bending moment imposed on the drill mast structure and improving the mechanical balance of the rotating assembly. This series covers unit weights from 5 to 260 kg \u2014 the bracket appropriate for geotechnical and exploration drill rigs with motor inputs from 1.1 to 15 kW and reduction ratios of 10:1 to 60:1.<\/p>\n<\/div>\n<\/div>\n

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

EP-WPKS Single Speed Reducer (4 \u2013 365 kg)<\/h3>\n

\u306e EP-WPKS<\/strong> extends the hollow-shaft range into the heavy end of the drill rig drive market \u2014 units up to 365 kg unit weight cover blasthole rotary heads, large reverse-circulation drill heads, and multi-pass coring drives where motor inputs exceed 15 kW and the drill string inertia is substantial. The shrink-disc locking assembly available in the KS variant replaces the keyway interface with a uniform radial clamp that distributes the drill string contact force evenly around the shaft circumference, eliminating the stress concentration at the keyway root that is the fatigue initiation point in most shaft failures on high-impact reverse-loaded drill drives.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

\"Heavy-duty<\/div>\n

<\/p>\n

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Lubrication Specification for Reverse-Impact Drill Service<\/h2>\n

The lubricant in a drill rig rotary head \u30a6\u30a9\u30fc\u30e0\u30ae\u30a2\u6e1b\u901f\u6a5f<\/strong> faces conditions that differ substantially from a fixed-installation conveyor reducer: the unit operates in multiple orientations (the drill mast angles from vertical to near-horizontal on some rigs), ambient temperatures swing from sub-zero at cold start in Canadian or Norwegian winter conditions to 50 \u00b0C surface ambient on Australian summer blast sites, and the cyclic torque reversals generate oil pressure spikes in the reducer sump that exceed the steady-state value calculated from forward-load conditions.<\/p>\n

The appropriate lubricant specification for this service is a fully synthetic PAO ISO VG 460 gear oil with extreme-pressure additives (AGMA EP rating) and confirmed tin-bronze compatibility (ASTM D130 copper corrosion test, 120 \u00b0C, 3 hours, maximum rating 2B). The PAO base stock provides a higher viscosity index than mineral oil \u2014 the oil maintains adequate film thickness across a wider temperature range without requiring a winter-grade reformulation for cold-start conditions on Canadian or Scandinavian sites. The extreme-pressure additive package protects both flanks of the worm tooth during the high-contact-stress engagement that occurs at each torque reversal, when the oil film has not yet re-established on the coast flank after the previous forward load cycle. Oil change interval for this specification in drill rig service is 1500\u20132000 hours, with quarterly oil sampling recommended to detect bronze particle generation (early warning of tooth wear progression) before it reaches a level requiring shutdown for wheel replacement.<\/p>\n<\/div>\n

<\/p>\n

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Climate-Specific Considerations for Drill Rig Reducer Performance<\/h2>\n
\n
\n
Cold-Start Duty \u2014 Canada and Nordic Operations<\/div>\n

At ambient temperatures below \u201320 \u00b0C, ISO VG 460 mineral oil becomes viscous enough to prevent adequate distribution within the reducer housing during the first minutes of operation. A drill rig that starts cold and immediately commands high rotary speed subjects the worm mesh to mixed-lubrication contact before the oil has reached operating temperature and viscosity. For Canadian and Nordic sites, the preferred solution is a pre-start oil heater (immersion heater in the sump, thermostatically controlled to maintain oil above 0 \u00b0C during standby) combined with a warm-up protocol of two to three minutes at minimum load before commanding full drilling torque. Alternatively, synthetic PAO ISO VG 220 provides adequate film thickness at \u201330 \u00b0C without requiring active heating on most mid-range frame sizes of the single speed worm reducer<\/strong> series.<\/p>\n<\/div>\n

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High-Temperature Duty \u2014 Australia and African Desert Sites<\/div>\n

On Australian Pilbara and Atacama or Kalahari drill sites where surface ambient temperatures exceed 45 \u00b0C and direct solar radiation adds a further 15\u201320 \u00b0C to the surface temperature of the reducer housing, thermal management of the worm speed reducer<\/strong> requires the same frame-size uplift approach used for other high-ambient mining drives: select one frame size larger than the minimum calculation indicates, specify synthetic PAO ISO VG 460, and consider a small screw-on heat-exchanger that circulates reducer oil through an air-blast cooler mounted in the rig’s air flow path. Confirming that the sump oil temperature stays below 90 \u00b0C at steady state \u2014 measured by a thermocouple during the commissioning run \u2014 validates the thermal adequacy of the selected configuration before extended operation commences.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

\"Worm<\/div>\n

<\/p>\n

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Planned Maintenance and Failure Mode Awareness<\/h2>\n

The dominant failure modes for a \u30b7\u30f3\u30b0\u30eb\u30b9\u30d4\u30fc\u30c9\u6e1b\u901f\u6a5f<\/strong> in drill rig rotary head service, in order of field frequency, are: worm wheel tooth pitting or spalling (progressive contact fatigue on the bronze tooth faces), input shaft bearing failure (usually inner ring fatigue from the combined radial and axial loading of reverse-impact duty), and shaft seal failure leading to oil loss and subsequent oil-starvation damage. Understanding which failure mode has occurred is important for the post-mortem analysis that determines whether the root cause was incorrect service factor selection, inadequate lubrication, misalignment at installation, or exceeding the duty cycle.<\/p>\n

Pitting on the drive flank only \u2014 the flank that carries forward drilling torque \u2014 indicates the reducer was correctly specified for reverse impact but is overloaded in forward drilling, suggesting the application’s motor power or string weight exceeds the assumed values in the selection calculation. Pitting on both flanks equally indicates the reducer is receiving shock loads in both directions at levels close to or exceeding its rated capacity; the appropriate response is to increase the service factor and uprate to a larger frame. Bearing failure on the output (worm wheel) side only, with intact input bearings, suggests that the drill shaft is applying an external radial load to the reducer output bore \u2014 usually caused by misalignment between the reducer bore and the drill head shaft centreline, which adds bending to the axial and radial loads the bearing was designed to carry. Quarterly oil sampling, monthly bearing temperature monitoring, and annual dimensional inspection of the worm wheel tooth profile are the minimum condition monitoring activities that maintain awareness of reducer health between planned maintenance interventions.<\/p>\n<\/div>\n

<\/p>\n

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Manufacturing Background<\/h2>\n

Our manufacturing facility has operated in mechanical power transmission engineering for more than ten years, developing a product range that covers agricultural gearboxes, worm gear reducers, planetary gear drives, power take-off shafts, hydraulic cylinders, precision gears, roller chains, and electric motors \u2014 all produced under ISO 9001:2015 quality management system certification. Structural components are manufactured in ductile iron, grey cast iron, cast steel, precision investment-cast steel, and aluminium alloy, with material grades selected to match the load, temperature, and service environment of each application. Gear teeth, worm shafts, sprockets, and output shafts are finished on multi-axis CNC hobbing, grinding, and turning centres to DIN and ISO dimensional standards. Customers specifying a complete drill rig rotary head drive system \u2014 reducer, motor, coupling hardware, and mounting provisions \u2014 can source all components through a single technically accountable manufacturing supplier rather than managing multi-vendor interface risks and parallel quality qualification processes.<\/p>\n

\u30ef\u30fc\u30af\u30b7\u30e7\u30c3\u30d7<\/h3>\n
\n
\"Worm
\n\"Main
\n\"Composite
\n\"Assembly<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

\n

Compatible Drive Components<\/h2>\n

A complete drill rig rotary head drive station involves more than the reducer. The following component product lines are available from the same manufacturing source, enabling procurement teams to source a fully matched and documented drive system.<\/p>\n

\n
\"Electric<\/p>\n
\n

\u96fb\u6c17\u30e2\u30fc\u30bf\u30fc<\/a><\/h3>\n

\u79c1\u305f\u3061\u306e \u96fb\u6c17\u30e2\u30fc\u30bf\u30fc<\/strong><\/a> range covers IEC frame sizes from fractional-kilowatt up to high-power units in IE2 and IE3 efficiency classes, dimensionally verified against the WPKA and WPKS reducer input flanges before shipment. For drill rig applications where the motor must operate in dusty or wet conditions, IP55 and IP65 variants are available in the same frame and mounting envelope as the standard catalogue motors, allowing drive system configuration to be finalised without separately qualifying a different motor supplier for the increased protection rating.<\/p>\n<\/div>\n<\/div>\n

\"Worm<\/p>\n
\n

\u30a6\u30a9\u30fc\u30e0\u30ae\u30a2\u30dc\u30c3\u30af\u30b9<\/a><\/h3>\n

Ancillary drives on drill rigs \u2014 feed system chain drives, crowd cylinder actuation motors, dust collector fan drives, and rod carousel rotation mechanisms \u2014 commonly use compact NMRV-type \u30a6\u30a9\u30fc\u30e0\u30ae\u30a2\u30dc\u30c3\u30af\u30b9<\/strong><\/a> units with ratios from 5:1 to 100:1. Sourcing these ancillary reducers alongside the primary head drive reducer from the same supplier simplifies spare parts inventory management on the rig \u2014 a meaningful operational advantage on remote sites in Canada, Australia, and southern Africa where parts resupply lead times are significant.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

\n

\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n
\n
\nQ1. Which single speed reducer series is recommended for a blasthole rotary drill head drive in an Australian iron ore open-pit operation where reverse string stall is frequent?<\/summary>\n
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For a blasthole rotary head drive in an Australian iron ore operation with frequent string stall events, the EP-WPKS with shrink-disc output is the appropriate specification. The shrink-disc locking assembly eliminates the keyway stress concentration that causes shaft fatigue failures under the cyclic reverse loading of string stall events. Apply a combined service factor of at least 2.25: 1.0 base + 0.50 for heavy shock + 0.50 for frequent torque reversal + 0.25 for Australian summer ambient temperature above 40 \u00b0C. Select the frame size whose output torque at the required reduction ratio exceeds the corrected motor torque by at least 15%. Specify synthetic PAO ISO VG 460 lubricant and confirm the sump oil temperature stays below 90 \u00b0C during the commissioning run before extended production drilling commences.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

\n
\nHow does a worm gear single speed reducer handle reverse impact loads from drill string torsional spring-back without a hydraulic coupling?<\/summary>\n
\n

A single speed worm reducer<\/strong> handles drill string torsional spring-back through two mechanisms. The first is service factor structural margin: at a 2.0\u20132.5 service factor, the reducer’s tooth contact area, housing wall thickness, and bearing capacity are sized for substantially more than the continuous rated torque, providing structural headroom to absorb the peak reverse torque of a string release without yielding. The second is the inherent compliance of the worm gear mesh: the sliding contact between the curved worm flank and the bronze wheel tooth distributes the reverse impact load across the full tooth face length rather than concentrating it at a point, and the slight elastic deformation of the bronze tooth face absorbs a portion of the impact energy that would otherwise be transmitted directly to the housing. Both mechanisms are passive \u2014 they require no active control system response and cannot fail to activate, unlike a hydraulic coupler that requires correct fluid fill and functional thermal protection to operate as designed.<\/p>\n<\/div>\n<\/details>\n<\/div>\n<\/div>\n<\/div>\n

\u7de8\u96c6\u8005: PXY<\/p>","protected":false},"excerpt":{"rendered":"

Mining & Quarrying \u00b7 Technical Reference An engineering reference for drill rig designers, OEM procurement engineers, and maintenance specialists in open-pit blasthole drilling, geotechnical investigation, and quarry perforation operations across Australia, Canada, South Africa, the United States, and Europe. The rotary head drive of a drill rig \u2014 whether a surface blasthole machine, a sonic drill, a reverse-circulation rig, or a geotechnical investigation unit \u2014 subjects its transmission to a category of loading that very few other mining drive applications impose: reverse impact. When a tricone bit or DTH hammer encounters a hard formation boundary, a buried boulder, or a change in rock competency, the rotational resistance of the drill […]<\/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":[40],"tags":[],"class_list":["post-1051","post","type-post","status-publish","format-standard","hentry","category-mining-quarrying"],"_links":{"self":[{"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/posts\/1051","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/comments?post=1051"}],"version-history":[{"count":2,"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/posts\/1051\/revisions"}],"predecessor-version":[{"id":1053,"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/posts\/1051\/revisions\/1053"}],"wp:attachment":[{"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/media?parent=1051"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/categories?post=1051"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/tags?post=1051"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}