Chain CVT Cone Disc and Pulley Layout for Low-Loss Torque Transfer

Solution Overview

Problem

Existing continuously variable transmissions (CVT) rely on friction, limiting their widespread use due to inefficiencies and power loss, and there is a need for a stepless transmission that uses engagement mechanisms rather than friction for power transmission.

Innovation Solution

A stepless transmission system utilizing a pair of active and passive cone discs with a chain and a movable friction plate chain wheel, where the distance between the cone discs adjusts to change the pulley's position, engaging and disengaging the chain for power transmission and speed regulation through a cam mechanism and pressure spring.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a friction-based CVT is used for stepless transmission, then continuous variable speed control is achieved, but power loss increases and transmission efficiency decreases

Engineering Contradiction:

Improvecontinuous variable speed controlVSAvoidpower loss

Core Design Contradiction:

Ease of operationVSLoss of energy

Solution Approach 1:

The patent replaces the friction-based mechanical transmission system with a chain engagement system. The chain engages with sprocket teeth to transmit power, substituting the friction contact mechanism with a positive engagement mechanism that eliminates sliding friction and associated power losses while maintaining continuous variable speed control capability through adjustable sprocket pitch radii.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If a friction-based CVT is used for stepless transmission, then continuous variable speed control is achieved, but transmission efficiency decreases

Engineering Contradiction:

Improvecontinuous variable speed controlVSAvoidtransmission efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent replaces the friction-based mechanical transmission system with a chain engagement system. The chain engages with sprocket teeth to transmit power, substituting the friction contact mechanism with a positive engagement mechanism that eliminates sliding friction and associated power losses while maintaining continuous variable speed control capability through adjustable sprocket pitch radii.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If friction is used for power transmission, then stepless speed variation is possible, but torque handling capability is limited

Engineering Contradiction:

Improvespeed variation rangeVSAvoidtorque handling capability

Core Design Contradiction:

Adaptability or versatilityVSForce

Solution Approach 1:

The patent replaces the friction-based mechanical transmission system with a chain engagement system. The chain engages with sprocket teeth to transmit power, substituting the friction contact mechanism with a positive engagement mechanism that eliminates sliding friction and associated power losses while maintaining continuous variable speed control capability through adjustable sprocket pitch radii.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

This design achieves high power transmission efficiency with low power loss and allows for mechanical stepless transmission, enabling flexible speed regulation and improved torque handling.

Implementation Method 1

the elastic force of a pressure spring acts on the movable friction plate chain wheel through the wheel seat, the pressure bar, the second pressure hinge plate, the pressure plate, and the pressurizing shaft

Methodology Applied

Scientific EffectElastic force: Elasticity

Implementation Method 2

The wheel rotates about the wheel shaft and rolls on a cam. The cam is fixedly connected to the box.

Methodology Applied

Scientific EffectCam mechanism: Cam

Implementation Method 3

a chain type stepless transmission... a chain, and a chain wheel

Methodology Applied

Scientific EffectChain transmission: Chain

Implementation Method 4

a pair of active cone discs, a pair of passive cone discs... transmits power by using a pair of active cone discs

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentEP3730813B1Chain type stepless transmission

Publication Date: 2023.03.22 TAN BO

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AI summary

The disclosure provides a chain type stepless transmission, including: a box (60), a pair of active cone discs including a fixed cone disc (33) and a moving cone disc (2), a pair of passive cone discs including a fixed cone disc (33) and a moving cone disc (2), an input shaft (42), an output shaft (31) and a chain (34), there are a group of pulleys (3) in the middle of each pair of passive cone discs and in the middle of each pair of active cone discs respectively, and the number of the group of pulleys (3) may be an arbitrary value, such as 2, 3, 4, 5, 6, 7, 8, etc.. In the stepless transmission, the fixed cone disc (33) and the moving cone disc (2) then transmit power from the input shaft (42) to the output shaft (31) through the chain (34), thereby realizing a high power of power transmission and a high torque.