Freelance Gear Design Engineer Jobs (NOW HIRING)

A globally leading consumer device company based in Sunnyvale, CA is seeking a highly skilled Gear Design Subject Matter Expert (SME) to join our Hardware Technologies team, focusing on the design, analysis, and optimization of micro-scale gear systems. The ideal candidate will bring deep expertise in precision gear engineering with a primary focus on size reduction and acoustic noise minimization. This role will drive innovation in compact mechanical drive systems for next-generation consumer hardware products.

Key Responsibilities:

• Lead micro gear design efforts from concept through production, including gear tooth geometry definition, material selection, and tolerance analysis for miniaturized assemblies.

• Develop and optimize gear profiles (involute, cycloidal, and non-standard tooth forms) to minimize transmission error, contact stress, and audible noise in sub-millimeter to single-digit-millimeter scale geartrains.

• Perform detailed acoustic and vibration analysis of gear mesh interactions, identifying root causes of noise (mesh harmonics, ghost frequencies, hunting tooth effects) and implementing design countermeasures.

• Drive gear system miniaturization by evaluating novel architectures (planetary, harmonic drive, strain wave, compound epicyclic) and emerging micro-manufacturing processes (LIGA, micro-EDM, micro-injection molding, photochemical etching).

• Define and validate gear specifications including module/DP, pressure angle, profile shift, tip relief, lead/profile crowning, and surface finish requirements tailored to micro-scale constraints.

• Collaborate with cross-functional teams including mechanical design, acoustics, materials science, manufacturing, and reliability engineering to deliver integrated solutions meeting aggressive size, noise, and lifetime targets.

• Develop and maintain predictive models (FEA, multi-body dynamics, semi-analytical contact models) for gear mesh stiffness variation, transmission error, and NVH performance.

• Establish design guidelines and best practices for micro gear systems, including DFM/DFA rules, inspection criteria, and qualification test protocols.

• Evaluate and qualify new materials and coatings (engineering polymers, MIM metals, DLC coatings, ceramic composites) for noise reduction and wear performance at micro scale.

Required Qualifications:

• M.S. or Ph.D. in Mechanical Engineering, Applied Mechanics, or closely related field

• 5+ years of hands-on gear design experience, with at least 3 years focused on miniature/microscale gear systems

• Expert-level knowledge of gear mesh theory, contact mechanics, and gear noise generation mechanisms

• Demonstrated experience reducing gear noise through profile optimization, micro-geometry modifications, and system-level tuning

• Proficiency with gear-specific software (KISSsoft, MASTA, Penn State GearLab tools, or equivalent) and general FEA (ANSYS, Abaqus)

• Deep familiarity with micro-manufacturing processes and their impact on achievable tolerances and surface quality

• Experience with gear metrology (CMM, gear checkers, surface profilometry) at fine pitch/module scales

Preferred Qualifications:

• Experience with polymer and composite gears for noise-sensitive applications

• Familiarity with acoustic measurement and analysis (sound power, order tracking, transfer path analysis)

• Knowledge of tribology and lubrication strategies for enclosed micro gearboxes

• Experience with tolerance stack-up and statistical methods (Monte Carlo, Six Sigma) applied to micro assemblies

• Background in consumer electronics, medical devices, or watchmaking (industries with strict size and noise constraints)

• Publications or patents in gear noise reduction or micro-mechanism design

• Hands-on prototyping experience with additive manufacturing (SLA, etc.) for micro gear feasibility studies

Type: Contract

Duration: 6 months with extension

Work Location: Sunnyvale, CA (hybrid)

Pay Rate: $80.00 - $95.00 ph (DOE)