Electric Engine Braking Device Using Mechanical Linkage
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Solution Overview
Problem
Existing engine braking systems relying on engine oil as a medium face limitations due to oil temperature and viscosity issues, leading to unreliable performance, especially at low temperatures, and prolonged engine braking intervention and exit times, which affect fuel efficiency and vehicle operation.
Innovation Solution
An electric engine braking device with a rocker arm shaft, camshaft, exhaust valves, and an auxiliary rocker arm, utilizing an electric driving mechanism that includes an execution motor, sliding plate frame, and contact leaf spring to control the engine braking function, eliminating the need for engine oil as a medium and allowing operation independent of oil temperature and pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If engine oil is used as a medium for transmitting motion in the valve control mechanism, then the engine braking function can be realized, but the performance becomes unreliable when oil temperature is low and viscosity is high
Solution Approach 1:
The patent replaces the hydraulic oil-based transmission system with a direct mechanical linkage system. The valve control mechanism uses a camshaft directly connected to the valve through a rocker arm, eliminating the need for engine oil as a transmission medium. This mechanical substitution resolves the contradiction by removing the harmful influence of oil viscosity and temperature on braking performance reliability.
2Ease of operation
If engine oil is used as the transmission medium, then the valve motion can be controlled, but the engine braking intervention and exit times are prolonged (>0.4 s)
Solution Approach 1:
The patent replaces the hydraulic control system with a direct mechanical linkage where the camshaft directly actuates the valve through the rocker arm. This eliminates the time delay associated with oil pressure buildup and fluid transmission, reducing the intervention and exit times to within one camshaft rotation cycle, thereby resolving the time loss contradiction.
3Reliability
If engine braking is intervened when oil temperature exceeds a certain limit value (e.g., 40°C), then the oil viscosity issue is avoided, but the operating conditions are limited
Solution Approach 1:
The patent eliminates the dependency on engine oil temperature by using a direct mechanical linkage system. The camshaft directly drives the valve through the rocker arm without requiring oil as a transmission medium. This allows the engine braking function to operate reliably across the full temperature range of the engine, resolving the contradiction between reliability and adaptability.
Data Source
AI summary
An electric engine braking device comprising a control mechanism and an electric driving mechanism, wherein the control mechanism comprises a housing, an execution plunger and a sliding assembly; the sliding assembly comprises a sliding block, a first elastic piece, a transfer plunger and a second elastic piece; the transfer plunger comprises a first position which is completely provided in the sliding block and a second position which extends out of the sliding block to connect the sliding block and the housing into a whole; and the electric driving mechanism comprises an execution motor, a sliding plate frame, a sliding plate and a contact leaf spring, the execution motor can push the sliding plate to slide along the sliding plate frame, drive the contact leaf spring to push the execution plunger to slide, and drive the transfer plunger to move and keep the transfer plunger at the second position.