{"id":1590,"date":"2026-09-08T02:31:21","date_gmt":"2026-09-08T02:31:21","guid":{"rendered":"https:\/\/superiortransmissioninc.com\/?post_type=product&p=1590"},"modified":"2026-09-08T02:31:21","modified_gmt":"2026-09-08T02:31:21","slug":"ep-ground-helical-gear-precision-finished-helical-gear-for-demanding-transmission-applications","status":"publish","type":"product","link":"https:\/\/superiortransmissioninc.com\/ja\/product\/ep-ground-helical-gear-precision-finished-helical-gear-for-demanding-transmission-applications\/","title":{"rendered":"EP-Ground Helical Gear \u2014 Precision-Finished Helical Gear for Demanding Transmission Applications"},"content":{"rendered":"
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EP-Ground Helical Gear \u2014 Precision-Finished Helical Gear for Demanding Transmission Applications<\/h2>\n

The EP-Ground Helical Gear series represents the upper tier of our helical gear product line \u2014 engineered for applications where surface accuracy, quiet operation, and load consistency are non-negotiable. Unlike standard hobbed gears, every tooth flank in this series is individually ground to tight tolerances, delivering measurably smoother engagement across the full mesh cycle. Whether you’re sourcing for a CNC machining center, an automated packaging line, or a precision conveyor drive, this gear is built to perform where standard gears fall short.<\/p>\n

\u30d8\u30ea\u30ab\u30eb\u30ae\u30a2\u00a0<\/a><\/p>\n<\/div>\n

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Technical Specifications (Module 1, 100T, Left Hand)<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u30d1\u30e9\u30e1\u30fc\u30bf<\/th>\n\u4fa1\u5024<\/th>\n\u6ce8\u8a18<\/th>\n<\/tr>\n<\/thead>\n
Bore Type<\/td>\nGround<\/td>\nH7 bore tolerance, finish-ground<\/td>\n<\/tr>\n
Transverse Module<\/td>\n1<\/td>\nStandard metric module<\/td>\n<\/tr>\n
\u6b6f\u306e\u6570<\/td>\n100<\/td>\nFull helical tooth set<\/td>\n<\/tr>\n
Helix Direction<\/td>\nLeft Hand<\/td>\nRight-hand versions available on request<\/td>\n<\/tr>\n
Shape<\/td>\nS1<\/td>\nStandard hub profile<\/td>\n<\/tr>\n
Bore Diameter (A)<\/td>\n15.0 mm<\/td>\nGround bore, H7 fit<\/td>\n<\/tr>\n
Hub Diameter (B)<\/td>\n50.0 mm<\/td>\nGround face, runout \u2264 0.01 mm<\/td>\n<\/tr>\n
Pitch Diameter (C)<\/td>\n100.00 mm<\/td>\nTransverse pitch diameter<\/td>\n<\/tr>\n
Outer Diameter (D)<\/td>\n102.00 mm<\/td>\nTip circle diameter<\/td>\n<\/tr>\n
Face Width (E)<\/td>\n8.0 mm<\/td>\nActive tooth face<\/td>\n<\/tr>\n
Hub Width (F)<\/td>\n10.0 mm<\/td>\nHub projection dimension<\/td>\n<\/tr>\n
Total Length (G)<\/td>\n18.00 mm<\/td>\nOverall axial length<\/td>\n<\/tr>\n
Helix Angle<\/td>\n21\u00b030′<\/td>\nTransverse contact ratio enhanced<\/td>\n<\/tr>\n
Pressure Angle<\/td>\n20\u00b0<\/td>\nStandard involute tooth form<\/td>\n<\/tr>\n
Quality Class<\/td>\nDIN 5 or better<\/td>\nPost-grinding inspection verified<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

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What Is a Ground Helical Gear \u2014 and How Does It Work?<\/h2>\n

A helical gear is a cylindrical gear whose teeth are cut at an angle \u2014 the helix angle \u2014 relative to the rotational axis. This angled tooth geometry means that, unlike straight-cut spur gears, multiple teeth enter mesh simultaneously rather than a single tooth pair making abrupt contact. The result is a gradual, rolling engagement that distributes load more evenly across the face width, dramatically reducing impact shock, vibration, and audible noise under load.<\/p>\n

What distinguishes the EP-Ground variant from a standard hobbed helical gear is the final grinding operation. After hobbing, each gear blank goes through a precision tooth-grinding process that corrects any accumulated pitch error, profile deviation, and lead irregularity left by the cutting process. The ground tooth surface achieves a much tighter DIN or JIS quality class \u2014 typically DIN 5 or better \u2014 compared to a hobbed gear which commonly lands at DIN 7 to DIN 9. In practical terms, this means the meshing contact patch is more uniform across the entire tooth face, reducing localized stress concentrations that can cause pitting or fatigue spalling over time. For engineers asking how does a helical gear work<\/em> at its best, the answer lies in the combination of the inherent helix geometry and the surface precision that tooth grinding provides.<\/p>\n

The EP-Ground series operates on parallel shafts, with left-hand and right-hand versions available to accommodate opposing thrust requirements or matched-pair configurations. The ground tooth flank also improves lubricant film retention, further extending service life in continuous-duty industrial environments. If you have been comparing a helical gear vs spur gear<\/strong> for your drive train design, the helical type consistently wins on noise, load capacity per unit face width, and fatigue life \u2014 and the ground finish takes all three advantages a step further.<\/p>\n<\/div>\n

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Five Key Advantages<\/h2>\n
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Superior Tooth Surface Accuracy<\/h3>\n

Tooth grinding achieves DIN 5 or better quality class. Profile deviations and pitch errors are corrected after hobbing, providing a contact pattern that remains consistent across the full operating speed range \u2014 critical for precision indexing drives and helical gearbox types used in machine tools.<\/p>\n<\/div>\n

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Low Noise, Smooth Power Delivery<\/h3>\n

The helix angle of 21\u00b030′ ensures gradual tooth engagement \u2014 multiple teeth share load at every instant. Combined with the ground finish, this eliminates the impact-impulse noise that plagues straight-cut or coarsely-finished gears, making this series a preferred choice for food processing and packaging machinery where quiet operation matters.<\/p>\n<\/div>\n

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Higher Load Capacity Per Face Width<\/h3>\n

Are helical gears stronger than straight cut gears? Under equivalent module and face width conditions, yes \u2014 helical teeth develop a larger effective contact ratio, distributing transmitted torque across a greater surface area. The EP-Ground’s precise tooth geometry maximises this advantage, allowing a compact gear to handle loads that would require a wider or larger-module spur gear.<\/p>\n<\/div>\n

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Consistent Interchangeability Across the Series<\/h3>\n

With a standardised transverse module of 1, pressure angle of 20\u00b0, and S1 hub shape, the EP-Ground range integrates directly with our broader helical gear series \u2014 including matched pinion sets and helical rack and pinion configurations. Sourcing left-hand and right-hand pairs from a single series eliminates mismatched tolerance stack-ups that occur when mixing gears from different helical gear suppliers.<\/p>\n<\/div>\n

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Extended Fatigue Life Through Optimised Surface Hardness<\/h3>\n

The ground tooth flanks are case-hardened to provide a hard, wear-resistant surface layer over a tough core. This combination resists pitting, micropitting, and scuffing \u2014 the primary failure modes in high-cycle gear applications. The result is a longer maintenance interval and lower total cost of ownership across the lifecycle of your helical gear shaft assembly.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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\u6750\u6599\u3068\u69cb\u9020<\/h2>\n

The EP-Ground series is produced from high-grade alloy structural steel \u2014 typically 20CrMnTi or 42CrMo4 equivalent \u2014 selected for its combined strength, machinability, and response to case-hardening heat treatment. The blank is first turned and bored to close dimensional tolerances before hobbing the tooth profile. Following heat treatment, the tooth flanks are precision-ground on CNC gear grinding machines, achieving a tooth surface roughness of Ra 0.4 \u00b5m or better.<\/p>\n

The bore is finish-ground to H7 tolerance, ensuring a reliable interference or transition fit onto the mating shaft \u2014 eliminating fretting wear at the bore-shaft interface that is common with poorly-fitted gear assemblies. The hub faces are also finish-ground to maintain runout within 0.01 mm, which is essential for accurate positioning in indexing and precision conveyor drive applications.<\/p>\n

For specific material certifications, hardness values, or material substitutions required by your project specification \u2014 particularly for food-grade, marine, or high-temperature environments \u2014 contact us directly for engineering support. Our team of mechanical transmission specialists has over a decade of experience working with international procurement and engineering teams across North America, Europe, and Southeast Asia.<\/p>\n<\/div>\n

\"superiortransmissioninc-products-EP-Ground<\/p>\n

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Working Principle of the Helical Gear<\/h2>\n

Helical gears transmit rotary motion between parallel shafts through an involute tooth profile cut at a defined helix angle to the gear axis. As the driving gear rotates, the leading edge of each helical tooth begins meshing with its counterpart on the driven gear before the previous tooth pair fully disengages. This overlapping engagement \u2014 characterised by a total contact ratio greater than that of equivalent spur gears \u2014 is the fundamental reason helical gears operate more smoothly and carry more torque per unit of module.<\/p>\n

In the EP-Ground series, the 21\u00b030′ helix angle is chosen to optimise the overlap contact ratio while keeping the axial thrust force within a range manageable by standard angular-contact or tapered roller bearings. The axial thrust force generated by the helix angle is an important design consideration \u2014 it acts along the gear shaft axis and must be reacted by the shaft bearings. Engineers specifying these gears in new helical gearset or helical gear reducer designs should account for this thrust component in their bearing selection calculations. In many cases, paired left-hand and right-hand helical gears mounted on the same shaft cancel axial forces \u2014 an arrangement used in double helical gear configurations for very high-power applications.<\/p>\n

The ground tooth surface reduces the coefficient of sliding friction between mating teeth, lowering heat generation and power loss at the mesh. In precision drives \u2014 robotic joint actuators, medical imaging equipment, coordinate measuring machines \u2014 this translates to more accurate positional repeatability and reduced thermal drift over extended operating cycles. The 20\u00b0 pressure angle follows the internationally accepted standard for industrial helical spur gear geometry, ensuring compatibility with standard gear calculation methods (ISO 6336, AGMA 2101) used globally by mechanical engineers.<\/p>\n<\/div>\n

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\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b7\u30ca\u30ea\u30aa<\/h2>\n

The EP-Ground series precision tooth finish and robust load rating make it a practical choice across a wide range of industries. Below are some of the most common deployment environments where this helical gear type consistently delivers performance advantages over coarser alternatives.<\/p>\n

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CNC Machine Tools<\/h3>\n

Precision helical gears are widely used in the spindle drives, axis feed boxes, and tool changers of CNC machining centres and turning centres. The ground tooth surface is critical here \u2014 even minor pitch errors translate into positional inaccuracies that exceed workpiece tolerance. Ground helical gear shafts in these drives must deliver consistent transmission error below 2 arc-minutes across the full load range.<\/p>\n<\/div>\n

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Industrial Automation & Robotics<\/h3>\n

Articulated robot arms, Cartesian gantries, and servo-driven indexers rely on low-backlash helical gear pinion sets for accurate joint positioning. The ground finish achieves the tooth-to-tooth uniformity needed to keep velocity ripple \u2014 the periodic variation in output speed \u2014 below thresholds that would cause vibration in sensitive end-effectors or optical measurement heads.<\/p>\n<\/div>\n

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Packaging & Food Processing<\/h3>\n

In high-speed filling lines, labelling machines, and form-fill-seal equipment, gears must run quietly at speeds up to 3,000 rpm without generating vibration that disturbs product registration or sealing quality. The EP-Ground series quiet meshing characteristics make it a recurring specification for European and Australian packaging OEMs where noise limits are regulated.<\/p>\n<\/div>\n

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Printing & Textile Machinery<\/h3>\n

High-speed rotary printing presses and warp-beam drives in weaving machines demand gear sets that maintain consistent velocity ratio across millions of cycles. Crossed helical gear stages are used in some textile drive architectures, but parallel-shaft ground helical gear pairs remain the standard for main drive sections where efficiency and low heat generation are paramount.<\/p>\n<\/div>\n

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\u30b3\u30f3\u30d9\u30a2\u304a\u3088\u3073\u30de\u30c6\u30ea\u30a2\u30eb\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/h3>\n

In continuous-duty conveyor drives \u2014 particularly inclined conveyors or accumulation systems where start-stop loading is frequent \u2014 the higher load capacity per face width of helical gears versus spur gears allows a more compact helical gear reducer to be used. Helical gears in parallel shaft gearbox assemblies handle high peak torques during start-up without the tooth impact damage that coarser gears experience.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Helical Gear vs Spur Gear \u2014 Which Is Better for Your Application?<\/h2>\n

The question of which is better \u2014 a spur gear or a helical gear \u2014 doesn’t have a single universal answer, but the EP-Ground series clearly holds the advantage in the majority of precision and continuous-duty scenarios. A helical spur gear (the industry shorthand sometimes used for parallel-shaft helical types) outperforms straight-cut gears on noise, vibration, and torque density. The overlap contact ratio of a helical gear at 21\u00b030′ helix angle is meaningfully higher than that of an equivalent spur gear, meaning each tooth carries load for a shorter fraction of its revolution \u2014 reducing peak tooth stress and fatigue crack initiation.<\/p>\n

The most commonly cited downside of helical gears is the axial thrust force created by the helix angle \u2014 something that does not occur with straight bevel gears or spur gears. What are the downsides of helical gears? In practice, this is the main one, and it is manageable with proper bearing selection. For very high shaft speeds where axial thrust forces become challenging, double helical gear configurations (herringbone geometry) are used \u2014 these cancel the axial force by using opposing helix directions on the same gear body. However, for the majority of industrial drive train applications, a single helical gear at the EP-Ground’s specified helix angle generates perfectly manageable thrust loads.<\/p>\n

For users deciding between spur gear and helical gear options for their next design iteration: if the application runs above 1,000 rpm, carries significant continuous torque, or has noise\/vibration constraints \u2014 helical is the correct choice. The ground finish variant is worth specifying whenever positional accuracy, long maintenance intervals, or high cycle counts are requirements in the design brief.<\/p>\n<\/div>\n

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About Us – Helical Gear Manufacturer<\/h2>\n

With more than ten years of focused experience in mechanical power transmission manufacturing, our facility brings together in-house design engineering, precision machining, heat treatment, gear grinding, and quality inspection under one roof. Our production covers an extensive range of transmission components: agricultural gearboxes, worm gear reducers, planetary gear drives, power take-off shafts, hydraulic cylinders, gears, chains, and motors.<\/p>\n

Our manufacturing operation is ISO 9001:2015 certified \u2014 a quality management framework that governs every stage from incoming material verification through final dimensional inspection before shipment. We design and produce a broad spectrum of industrial and agricultural gearboxes and assemblies using ductile iron, cast iron, cast steel, precision cast steel, and cast aluminium as base materials, alongside gears, sprockets, worm gears, pulleys, worms, shafts, and a range of custom non-standard mechanical parts to customer-supplied drawings or samples.<\/p>\n<\/div>\n

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\u30ef\u30fc\u30af\u30b7\u30e7\u30c3\u30d7<\/h3>\n
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\"Gear
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\n\"\u7a74\u3042\u3051\u30fb\u30d5\u30e9\u30a4\u30b9\u52a0\u5de5\u30bb\u30f3\u30bf\u30fc\"
\n\"\u5de5\u5834\u751f\u7523\u6982\u8981\"<\/div>\n<\/div>\n<\/div>\n

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\u95a2\u9023\u88fd\u54c1 \u2014 \u5b8c\u5168\u306a\u30b7\u30b9\u30c6\u30e0\u4e92\u63db\u6027<\/h2>\n

We supply the full transmission system, not just individual components. Pairing our EP-Ground series with matched components from the same product family eliminates tolerance mismatches and simplifies sourcing. Both related products below are available for single-source procurement alongside your helical gear order.<\/p>\n

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Our full helical gear series covers modules from 0.5 to 6, tooth counts from 10 to 200, and both right-hand and left-hand variants \u2014 enabling complete helical gear set matching for drives from miniature instrumentation to heavy industrial gearboxes. All variants share the same dimensional standards as the EP-Ground series for direct interchangeability.<\/p>\n

\"Full<\/p>\n<\/div>\n

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Helical Rack and Pinion Systems<\/a><\/h3>\n

Our helical rack and pinion systems are designed for direct pairing with the EP-Ground helical pinion gear series. Available in ground and hobbed variants, the helical rack converts rotary motion to linear displacement with the same smooth, low-noise engagement characteristics as the mating helical gear. Widely used in linear axis drives for CNC routers, plasma cutters, and automated sliding gate systems.<\/p>\n

\"Helical<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n
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\nWhat type of industrial machinery in Australia or the UK most commonly uses a precision ground helical gear instead of a standard hobbed gear?<\/summary>\n
Precision gears are most consistently specified in CNC machine tools, servo-driven packaging lines, and high-speed printing presses operating in Australian and UK manufacturing facilities. The key trigger is usually a noise compliance requirement, a tight positional accuracy specification, or a fatigue life target that a hobbed gear cannot reliably meet. Ground gears are also routinely used in food processing drives in these markets, where regulatory cleanliness standards demand sealed, low-vibration drive arrangements that don’t generate metal particulate debris from premature tooth wear.<\/div>\n<\/details>\n<\/div>\n
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\nHow does a ground helical gear reduce noise and vibration compared with a spur gear in a parallel shaft gearbox application?<\/summary>\n
The noise and vibration reduction comes from two compounding factors. First, the helix angle produces a gradual tooth engagement \u2014 multiple teeth are simultaneously in mesh, so the load transfer is continuous rather than impulsive. Second, the ground tooth surface eliminates the pitch error and profile deviation that cause the periodic meshing force variation (transmission error) that drives gear noise. A ground helical gear at 21\u00b030′ helix angle can operate 8 to 15 dB quieter than an equivalent spur gear running at the same pitch line velocity, with the improvement most pronounced at speeds above 1,500 rpm where aerodynamic excitation and tooth mesh frequency align.<\/div>\n<\/details>\n<\/div>\n
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\nWhich helical gear type is best suited for a robotic arm joint actuator where backlash must stay below 3 arc-minutes across the service life?<\/summary>\n
For robotic joint drives with backlash requirements under 3 arc-minutes, precision helical gear sets \u2014 DIN 5 or better \u2014 are the standard starting point. The ground tooth form tightly controls the tooth thickness tolerance and profile deviation, which are the primary contributors to functional backlash in a gear mesh. For extremely demanding service lives, specifying ground gears with a slightly increased tip relief profile modification helps maintain low backlash as the contact zone wears in. Pairing the gear with a matched ground helical pinion gear from the same manufacturing lot ensures the tightest possible total composite error values between the mating pair.<\/div>\n<\/details>\n<\/div>\n
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\nWhere can North American or European engineers source a complete helical gear set \u2014 including matched pinion, gear rack, and gearbox \u2014 from a single factory to simplify their supply chain?<\/summary>\n
Single-source procurement for a complete helical gear drive system \u2014 covering the ground helical gear, matched helical pinion gear, helical rack and pinion, and a parallel shaft gearbox \u2014 is one of the key supply-chain advantages of working directly with a vertically integrated gear manufacturer. Our facility produces all of these components in-house under ISO 9001:2015 quality control, with the option to supply matched sets with verified composite error readings. This eliminates the tolerance accumulation and communication friction that arises when engineers source gears, racks, and gearboxes from three separate helical gear suppliers.<\/div>\n<\/details>\n<\/div>\n
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\nWhat are the main downsides of helical gears in a high-speed conveyor drive, and how can the axial thrust force be managed effectively?<\/summary>\n
The primary downside of helical gears in any drive application is the axial thrust force generated by the helix angle. In a conveyor drive running at continuous high speed, this thrust load must be reacted by angular-contact or tapered roller bearings at both shaft ends \u2014 adding a bearing selection and housing design step that a spur gear drive avoids. The magnitude of the axial force is a function of the tangential load and the tangent of the helix angle. At 21\u00b030′, the axial force is approximately 39% of the tangential force \u2014 a ratio that most standard bearing housings can accommodate without upsizing. For very high torque conveyor applications, double helical gear arrangements eliminate this axial force entirely by using opposing helix angles, but at greater manufacturing and assembly complexity.<\/div>\n<\/details>\n<\/div>\n<\/div>\n<\/div>\n

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EP-Ground Helical Gear: precision ground, Module 1, 100-tooth, left-hand. DIN 5 accuracy, 21\u00b030′ helix angle, 20\u00b0 pressure angle. Quiet, high-load, parallel shaft drive. ISO 9001:2015 factory.<\/p>\n

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

\u306e\u00a0<\/span>EP-Ground Helical Gear (Module 1, 100 Tooth)<\/span><\/strong>\u00a0is a high-precision transmission component designed for smooth and quiet operation. Featuring a left-hand helix with a 21\u00b030′ helix angle and a standard 20\u00b0 pressure angle, this S1 shape gear ensures efficient power transfer and reduced axial load stress. Manufactured with a ground bore (15.0 mm) for superior concentricity, it has a pitch diameter of 100.00 mm and an outer diameter of 102.00 mm. The gear includes a 50.0 mm hub diameter with a 10.0 mm hub width and an 8.0 mm face width, resulting in a compact total length of 18.00 mm. Ideal for precision machinery, robotics, and automation systems requiring accurate motion control and high durability.<\/span><\/p>","protected":false},"featured_media":1592,"template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[60],"product_tag":[],"class_list":["post-1590","product","type-product","status-publish","has-post-thumbnail","product_cat-helical-gear","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/product\/1590","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/media\/1592"}],"wp:attachment":[{"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/media?parent=1590"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/product_brand?post=1590"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/product_cat?post=1590"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ja\/wp-json\/wp\/v2\/product_tag?post=1590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}