Rack-and-Sector Motion Converter for Stable Reciprocating Rotation
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Solution Overview
Problem
Existing reciprocating linear/rotational motion conversion devices, such as crank link mechanisms and sector-gear engines, suffer from low transmission efficiency, high energy consumption, and unstable operation due to mechanical friction and misalignment issues.
Innovation Solution
A reciprocating linear/rotational motion conversion device with a reversing mechanism that synchronously rotates with the main shaft and reversing block, ensuring accurate engagement and disengagement of the sector gear with the gear rack pair, reducing mechanical friction and allowing smooth, continuous operation by constraining the rack frame along a predetermined trail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a crank link mechanism is used for motion conversion, then the structure is simple and easy to manufacture, but the transmission efficiency is low and energy consumption is high
Solution Approach 1:
The motion conversion is divided into two independent stages: first the piston converts reciprocating motion to rotational motion of the main shaft, then the rack and pinion mechanism converts rotational motion to reciprocating motion of the crosshead. This segmentation allows each stage to be optimized independently, improving overall transmission efficiency while maintaining manufacturing simplicity
Solution Approach 2:
The main shaft acts as an intermediary element between the piston and the rack mechanism. It receives rotational motion from the piston and transmits it to the rack, enabling efficient motion conversion while reducing mechanical friction and energy loss compared to direct crank link mechanisms
2Loss of energy
If a sector-gear mechanism is used for motion conversion, then the transmission efficiency is improved, but the operation stability deteriorates due to inaccurate reengagement
Solution Approach 1:
The rack frame serves as a feedback element that guides the reversing block along a predetermined trail. This ensures that the sector gear and gear rack maintain accurate relative positions during disengagement and reengagement, preventing misalignment and ensuring stable operation while maintaining high transmission efficiency
Solution Approach 2:
The reversing mechanism performs preliminary actions by synchronously rotating with the main shaft to prepare the sector gear and gear rack for accurate reengagement before the actual motion conversion begins. This preliminary positioning ensures smooth and stable operation without impact or misalignment
3Productivity
If a shaft type connecting rod transmission system is used, then the motion conversion capability is achieved, but the mechanical friction increases and the system vibrates
Solution Approach 1:
The invention replaces the traditional shaft type connecting rod mechanical system with a rack and pinion mechanism driven by a main shaft. This substitution eliminates the sliding friction between connecting rod surfaces and reduces vibration by using rolling contact in the gear mechanism, while maintaining full motion conversion capability
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 significantly improves transmission efficiency, reduces energy consumption, and ensures stable, continuous operation by minimizing mechanical friction and impact, enabling accurate reengagement of the sector gear with the gear rack pair.
Implementation Method 1
a linear motion guiding mechanism 2, a sector gear 3 and a rack frame 4 linearly moving along the linear motion guiding mechanism 2
Implementation Method 2
A gear rack pair is arranged on the inner wall of the rack frame 4. The gear rack pair comprises a first gear rack 41 and a second gear rack 42 separately arranged on both sides of the sector gear 3
Implementation Method 3
enables accurate constraint on the rack frame by the reversing mechanism in the transitional phase and reversing phase
Implementation Method 4
the reciprocation of the slide block in operation increases load and mechanical friction of the system
Data Source
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AI summary
The invention discloses a reciprocating linear/rotational motion conversion device and a cylinder device, in particular to a reciprocating linear/rotational motion conversion device and a cylinder device used in the mechanical transmission field. The reciprocating linear/rotational motion conversion device comprises a main shaft, a linear motion guiding mechanism, a sector gear and a rack frame. The sector gear is fixedly connected with the main shaft. A rack pair is arranged on the inner wall of the rack frame. The rack pair comprises a first gear rack and a second gear rack separately arranged on both sides of the sector gear. The reciprocating linear/rotational motion conversion device further comprises a reversing mechanism fixedly connected with the main shaft. The cylinder device comprises the reciprocating linear/rotational motion conversion device, connecting rods, pistons and cylinder bodies. The cylinder body is sleeved on the piston, and a cylinder head is arranged on one end of the cylinder body. With the solution of the invention, the transmission efficiency can be significantly improved to reduce energy consumption and achieve smooth and continuous operation.