{"product_id":"pinion","title":"Precision Steering Pinion","description":"\u003ch2\u003ePrecision Steering Pinion Manufacturing Case\u003c\/h2\u003e\n\u003cp\u003eThis manufacturing case documents a 20CrMo right-hand helical pinion produced to a customer-controlled drawing. The tooth route uses \u003cstrong\u003erough hobbing before carburizing\u003c\/strong\u003e, followed by \u003cstrong\u003efinish hobbing after carburizing\u003c\/strong\u003e. Tooth geometry, heat treatment, metallurgical acceptance, inspection and tool approval are specific to this released component and are not default specifications for every pinion program.\u003c\/p\u003e\n\u003ch3\u003eVerified component specification\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 20CrMo alloy steel according to GB\/T 3077, with controlled gear-steel quality, grain size and cleanliness requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTooth reference:\u003c\/strong\u003e DIN 3960 and DIN 3961; DIN 8 drawing requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTooth geometry:\u003c\/strong\u003e 11 teeth, normal module 1.90110, normal pressure angle 22.5°, right-hand helix angle 20.5°, pitch diameter 22.3260 mm and nominal outside diameter 27.20 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTooth generation:\u003c\/strong\u003e Rough hobbing before heat treatment, with machining allowance retained for post-carburizing finish hobbing. Roughing and finishing pinion-tooth generating tools require product-engineering approval for this program.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat treatment:\u003c\/strong\u003e Carburizing, quenching and tempering at 163 ±5°C for at least one hour, according to the controlled project specification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface hardness:\u003c\/strong\u003e HRC 58–63 after tempering and finishing operations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEffective case depth:\u003c\/strong\u003e Minimum 0.6 mm to 86.4 HR15N.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal case depth:\u003c\/strong\u003e Maximum 1.4 mm across the complete tooth boundary, including below the roots, as defined by the drawing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTraceability and delivery:\u003c\/strong\u003e Burr-free condition, controlled rust prevention and project-specific traceability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eManufacturing process: rough hobbing, carburizing and finish hobbing\u003c\/h3\u003e\n\u003cp\u003eProduction starts with verification of the 20CrMo material condition and the controlled metallurgical requirements. Turning, milling, bore preparation and datum machining establish the pinion blank. The 11-tooth right-hand helical form is then rough-hobbed with a defined finishing allowance. The roughing tool, setup and generated tooth condition are reviewed against the approved process before heat treatment.\u003c\/p\u003e\n\u003cp\u003eThe rough-hobbed component is carburized, quenched and tempered. The heat-treatment route must control surface hardness, effective and total case depth, network carbides, apparent grain size, retained austenite and quench cracks. After heat treatment, the carburized tooth form is finish-hobbed to recover the specified tooth geometry and DIN 8 deviation limits. The finishing hob and tooth-generation setup are subject to the same product-engineering approval requirement as the roughing tool.\u003c\/p\u003e\n\u003cp\u003eThis sequence is important for the case: the first hobbing operation generates the tooth form and leaves controlled stock for distortion and finishing; the second operation is a post-carburizing finish-hobbing step, not a repeat of ordinary soft cutting. Final bore, chamfer and related surfaces are completed according to the released drawing and process plan.\u003c\/p\u003e\n\u003ch3\u003eTooth accuracy and inspection\u003c\/h3\u003e\n\u003cp\u003eFinal inspection is referenced to the drawing’s DIN 8 requirements and agreed datum system. Key drawing limits include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasurement over two 4.000 mm balls:\u003c\/strong\u003e 30.207–30.257 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal pitch deviation:\u003c\/strong\u003e Maximum 0.040 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndividual pitch deviation:\u003c\/strong\u003e Maximum 0.014 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjacent pitch error:\u003c\/strong\u003e Maximum 0.018 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal lead deviation:\u003c\/strong\u003e Maximum 0.020 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal profile deviation:\u003c\/strong\u003e Maximum 0.018 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRadial runout:\u003c\/strong\u003e Maximum 0.029 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRadial composite error:\u003c\/strong\u003e Maximum 0.035 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eInspection also covers the tooth root and active profile limits, bore and lead-in chamfer condition, surface finish, hardness and case depth. Metallurgical verification includes the customer-defined requirements for carbide condition, grain size, retained austenite and freedom from quench cracks. Material certificates, heat-treatment records, tooth inspection reports, dimensional reports and traceability records are retained or supplied according to the purchasing specification.\u003c\/p\u003e\n\u003ch3\u003eApplication and quotation boundary\u003c\/h3\u003e\n\u003cp\u003eThis pinion is presented as a manufacturing example for a steering or transmission program requiring controlled helical-tooth generation before and after carburizing. It does not establish a universal material, module, helix angle, DIN grade or heat-treatment route for other pinions. New programs require independent review of the drawing, standard edition, tooth data, datum system, material, heat treatment, batch size, tool approval and inspection method.\u003c\/p\u003e\n\u003ch3\u003eInformation required for a similar project\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReleased 2D drawing and available 3D model\u003c\/li\u003e\n\u003cli\u003eMaterial grade, cleanliness and metallurgical specification\u003c\/li\u003e\n\u003cli\u003eModule, pressure angle, helix data, tooth count and governing gear standard\u003c\/li\u003e\n\u003cli\u003eRoughing and finishing stock requirements\u003c\/li\u003e\n\u003cli\u003eHeat-treatment, hardness and case-depth requirements\u003c\/li\u003e\n\u003cli\u003eTooth-deviation limits, datums and inspection-report format\u003c\/li\u003e\n\u003cli\u003ePrototype quantity, production quantity, annual demand and delivery target\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eReview our \u003ca href=\"\/es\/pages\/custom-gear-components-manufacturing\"\u003ecustom gear manufacturing capabilities\u003c\/a\u003e and \u003ca href=\"\/es\/pages\/quality-inspection\"\u003equality inspection process\u003c\/a\u003e. To start a technical review, \u003ca href=\"\/es\/pages\/contact?service=Precision%20Steering%20Pinion\"\u003esend the available pinion drawing and project requirements\u003c\/a\u003e.\u003c\/p\u003e","brand":"Jinhua Machinery","offers":[{"title":"Default Title","offer_id":48110182498519,"sku":"(Overall Length：50~250mm Diameter：φ10~φ65 Gear accuracy：Grade 8)","price":0.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0797\/1137\/1479\/files\/01.jpg?v=1781489551","url":"https:\/\/jinhuamach.com\/es\/products\/pinion","provider":"Jinhua Machinery","version":"1.0","type":"link"}