Planetary Roller Power Transmission Inclined Support Shaft
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Solution Overview
Problem
In planetary roller power transmission devices, oil-containing rollers can detach from support shafts due to inclination and centrifugal forces, leading to increased rotational resistance and potential contact with loose ribs or planetary rollers, which reduces the device's lifespan.
Innovation Solution
The support shafts are inclined such that their distal end is closer to the axis of the stationary ring than the base end, and a claw portion is formed on the support shaft to engage the oil-containing roller, preventing detachment and ensuring continuous contact with the planetary rollers for stable lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the support shaft is made vertical to the stationary ring axis, then the structure is simple and easy to manufacture, but the oil-containing roller may detach due to inclination and centrifugal force
Solution Approach 1:
The support shaft is designed with an inclined axis rather than being vertical, creating an asymmetric configuration where the distal end is closer to the stationary ring axis than the base end. This asymmetry generates a component of contact force that counteracts centrifugal force, preventing the oil-containing roller from detaching during rotation.
Solution Approach 2:
The inclined support shaft creates a counterbalancing force component through the contact between the oil-containing roller and planetary roller. This counterforce opposes the detrimental centrifugal force, effectively balancing the forces acting on the oil-containing roller to prevent detachment.
2Device complexity
If the oil-containing roller is allowed to move freely on the support shaft, then the device is simple, but the roller may contact loose ribs or planetary rollers causing increased rotational resistance
Solution Approach 1:
The inclined support shaft configuration creates a counterbalancing force that prevents the oil-containing roller from moving outward due to centrifugal force. This ensures the roller remains properly positioned between the planetary rollers, preventing contact with loose ribs and maintaining low rotational resistance.
Solution Approach 2:
By changing the orientation parameter of the support shaft from vertical to inclined, the system alters the force distribution and roller positioning. This parameter change ensures the roller maintains optimal contact with planetary rollers while preventing harmful contact with loose ribs, thereby reducing rotational resistance.
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 configuration prevents oil-containing rollers from detaching from the support shafts, maintaining stable lubrication and reducing rotational resistance, thereby extending the lifespan of the power transmission device.
Implementation Method 1
due to centrifugal force associated with the rotation of the support plate 144, a force acts on the oil-containing roller 129 in the direction detaching from the support shaft 128
Implementation Method 2
an oil-containing roller formed by mixing synthetic resin powder with oil and baking the resulting mixture in a roller shape is used with grease to increase the lifespan of a device
Data Source
AI summary
A planetary roller power transmission device includes: a stationary ring; a sun shaft disposed radially inside the stationary ring so as to be concentric with an axis of the stationary ring; planetary rollers provided between the stationary ring and the sun shaft so as to be pressed against them; a carrier that rotatably supports the respective planetary rollers and rotates in conjunction with revolution of the planetary rollers; an oil-containing roller configured to be in contact with a peripheral surface of each planetary roller; and a support body having a support shaft that is formed to protrude toward one side in an axial direction of the stationary ring in a cantilevered manner and rotatably supports the oil-containing roller. An axis of the support shaft is inclined such that a distal end of the support shaft is closer to the axis of the stationary ring than a base end thereof.