Lawn Mower Impact Protection Assembly for Gear Damage Prevention
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Solution Overview
Problem
Lawn mowers with dual blades often experience gear damage due to momentary torque spikes when encountering obstacles, causing the blades to stop and resulting in normal operation failure.
Innovation Solution
Incorporating an impact protection assembly with a first bearing seat, a second bearing seat, an elastic member, and a ball between the two, along with a protrusion on the first bearing seat, which allows for relative rotation between the transmission and driving assemblies when resistance exceeds a preset value, thereby preventing torque transmission and protecting the gears.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the blade rotates at high speed to increase cutting efficiency, then productivity is improved, but when the blade hits obstacles, the momentary torque causes gear damage and reduces reliability
Solution Approach 1:
The patent introduces an elastic member positioned between the driving assembly and transmission assembly that acts as a cushioning element. When the blade hits an obstacle and momentary torque increases, the elastic member compresses to absorb the impact energy, preventing the torque spike from being transmitted to the gears. This beforehand cushioning mechanism protects the gear system while allowing the blade to continue rotating at high speed for efficient cutting.
2Stability of the object's composition
If a rigid connection is used between driving assembly and transmission assembly to ensure synchronous rotation, then operational stability is improved, but impact forces are transmitted directly causing gear damage
Solution Approach 1:
The patent changes the mechanical parameter of the connection between driving and transmission assemblies from rigid to flexible by introducing an elastic member. This elastic member maintains the synchronous rotation relationship under normal operating conditions while changing its stiffness parameter when subjected to impact forces. The elastic member compresses under impact, allowing relative movement between assemblies to prevent force transmission, yet maintains rotational synchronization during normal operation.
3Reliability
If the elastic member allows relative rotation to protect against impact, then gear protection is improved, but cutting precision may be affected
Solution Approach 1:
The patent employs a dynamic connection mechanism where the elastic member's stiffness is not fixed but changes based on operating conditions. During normal cutting operations, the elastic member remains in its elastic state, maintaining sufficient stiffness to ensure synchronous rotation and cutting precision. When impact forces exceed a threshold, the elastic member compresses dynamically, allowing relative rotation to protect the gears. This dynamic behavior ensures both cutting precision and gear protection.
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 absorbs and distributes sudden impact forces, reducing gear damage and ensuring continuous operation by allowing the transmission and cutting assemblies to rotate synchronously while preventing excessive torque from reaching the gears.
Implementation Method 1
an elastic member and a ball that are disposed between the first bearing seat and the second bearing seat... When the resistance received by the cutting assembly is greater than a preset value, the elastic member is continuously compressed
Data Source
AI summary
A lawn mower comprises a driving assembly, an impact protection assembly, a transmission assembly and a cutting assembly. The impact protection assembly comprises a first bearing seat and a second bearing seat which are mated with each other, and an elastic member and a ball which are positioned between the first bearing seat and the second bearing seat. The first bearing seat is provided with a protrusion. When the driving assembly performs driving, the ball is pushed by the elastic member to be in contact with the protrusion of the first bearing seat, so that the transmission assembly and the cutting assembly are driven to rotate synchronously. When the resistance received by the cutting assembly is greater than a preset value, the elastic member is continuously compressed and the ball passes over the protrusion, and a relative rotation between the transmission assembly and the driving assembly occurs.