Resin Gear Grease for Low-Temperature Starting and Wear Resistance
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Solution Overview
Problem
Conventional resin gear devices in HVAC systems for vehicles face challenges in noise reduction and longevity, particularly in low-temperature environments, due to issues with grease lubrication and wear resistance, leading to increased noise and reduced lifespan.
Innovation Solution
A grease composition is developed using a low-viscosity poly-alpha-olefin oil, lithium soap as a thickening agent, styrene-isoprene resin or liquid isoprene rubber as a viscosity increasing agent, melamine cyanurate and polytetrafluoroethylene as solid lubricants, and tricresyl phosphate or polymeric ester as an anti-wear agent, applied to the engaging and bearing parts of resin gear devices to enhance wear resistance and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a low-viscosity base oil is used in the grease composition, then the starting performance in low-temperature environment is improved, but the evaporation amount increases and the lifespan is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the base oil from conventional mineral oils to synthetic hydrocarbon oils (poly-α-olefins) with specific viscosity ranges (20-50 cSt at -40°C, 2-6 mm²/s at 100°C). This parameter change allows the grease to maintain low-temperature fluidity for good starting performance while having low evaporation characteristics for extended lifespan.
Solution Approach 2:
The patent creates a composite grease formulation by combining synthetic hydrocarbon base oil with specific thickening agents (lithium complex soap, calcium sulfonate complex soap) and additive packages. This composite material approach synergistically achieves both low-temperature operability and high-temperature stability, resolving the contradiction between starting performance and lifespan.
2Object-generated harmful factors
If elastic gears made of polyurethane rubber or elastomeric material are used, then the noise reducing effect is achieved, but the durability is reduced and the life is short
Solution Approach 1:
The patent changes the material parameter of gears from elastic materials (polyurethane rubber) to rigid but self-lubricating materials (resins with specific friction coefficients). This parameter change maintains noise reduction by using resin materials that are inherently quieter than metal, while simultaneously improving durability and lifespan.
Solution Approach 2:
The patent applies grease composition specifically designed for resin gears to enable self-lubrication. The grease formulation with synthetic hydrocarbon base oil and complex soap thickeners provides continuous lubrication to resin gear surfaces, allowing them to operate quietly without the durability problems of elastic materials.
3Ease of operation
If conventional grease compositions are used on resin gears, then the lubricating performance is provided, but the wear resistance is insufficient and noise increases over time
Solution Approach 1:
The patent develops a composite grease formulation combining synthetic hydrocarbon base oil with multiple thickening agents (lithium complex soap, calcium sulfonate complex soap) and wear protection additives. This composite material provides superior adhesion to resin surfaces and maintains stable lubrication film, ensuring long-term wear resistance and noise reduction.
Solution Approach 2:
The patent optimizes the grease composition specifically for resin gear contact surfaces, using additives that enhance boundary lubrication at the gear interface. This local quality enhancement ensures that the critical engaging parts and bearing parts receive targeted lubrication protection, maintaining wear resistance and quiet operation throughout the gear device lifecycle.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces noise, improves starting performance in low-temperature environments, and extends the lifespan of resin gear devices by minimizing wear and oil separation, resulting in a quieter and more durable actuator.
Implementation Method 1
a base oil including a poly-alpha-olefin oil with a kinematic viscosity at 100° C. of 4 to 6 mm2/s
Implementation Method 2
a thickening agent which is lithium soap
Implementation Method 3
melamine cyanurate and polytetrafluoroethylene as solid lubricants
Data Source
AI summary
An actuator includes a stepping motor; a multi-stage gear device including a first stage gear attached to a rotation shaft of the motor, wherein a gear of each stage engages with a gear of a next stage; and a base member on which the multi-stage gear device and the stepping motor are mounted, wherein in the multi-stage gear device, a grease composition for resin is applied to a bearing part of the gear, and to an engaging part between the gears, and the grease composition for resin includes: (a) a base oil including a poly-alpha-olefin oil with a kinematic viscosity at 100° C. of 4 to 6 mm2/s; (b) a thickening agent which is lithium soap; (c) a viscosity increasing agent; (d) a solid lubricant; and (e) an anti-wear agent, and wherein the NLGI consistency number of the composition is 00, 0, 1, or 2.