Vehicle Seat Legrest Massage Device with Eccentric Striking Mechanism
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Solution Overview
Problem
Existing vehicle seat massage devices primarily installed in the seatback or seat cushion fail to effectively massage the calves, leading to discomfort and increased fatigue due to impaired blood flow.
Innovation Solution
A massage device for a vehicle seat legrest featuring a motor with a bidirectional rotary shaft, eccentric shafts, motion conversion devices, and a striking body that converts rotational motion into linear reciprocating motion to massage the calves, with a controller adjusting speed based on vehicle speed and passenger feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If massage devices are installed in the seatback or seat cushion, then the upper body and thighs can be massaged, but the calves cannot be massaged
Solution Approach 1:
The massage system is divided into multiple independent modules: seatback massage module for upper body, seat cushion massage module for thighs, and legrest massage module for calves. Each module can operate independently, allowing comprehensive coverage of different body parts without interfering with each other's functionality.
Solution Approach 2:
The massage coverage is extended from the traditional two-dimensional plane of seatback and cushion to include the third dimension of the legrest area. By installing the massage module in the legrest, the system achieves three-dimensional coverage of the entire seated body, including previously inaccessible calf regions.
2Device complexity
If air cells are used for massage, then the structure is simple, but the massage effect on calves is insufficient
Solution Approach 1:
The legrest massage module integrates multiple components including a motor, bidirectional rotary shaft, eccentric shafts, motion conversion devices, and striking bodies into a unified system. This combination of mechanical elements creates an effective striking massage action that targets calf muscles, achieving reliable massage effectiveness while maintaining reasonable structural complexity.
3Force
If cylinders are used for striking massage, then the massage force is strong, but the device complexity increases
Solution Approach 1:
The traditional heavy cylinder-based striking mechanism is replaced with a more compact system using a motor-driven bidirectional rotary shaft connected to eccentric shafts. The eccentric shafts convert rotational motion into linear reciprocating motion of the striking bodies, generating strong massage force with reduced mechanical complexity and smaller component size.
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 device effectively massages the calves, improving blood flow and reducing fatigue, while reducing noise and enhancing massage performance compared to traditional air-cell or cylinder-type systems.
Implementation Method 1
a motor provided in a type including a bidirectional rotary shaft
Implementation Method 2
eccentric shafts respectively eccentrically connected to the bidirectional rotary shafts of the motor, a motion conversion device connected to each of the eccentric shafts to convert a rotational motion of the eccentric shaft into a linear reciprocating motion
Implementation Method 3
a striking body connected to the linear motion device to strike a calf portion of a passenger
Data Source
AI summary
Disclosed is a massage device for a legrest of a vehicle seat in which a massage module capable of massaging the calves of a passenger by striking the same is installed so as to massage the calves of the passenger, thereby improving blood flow to the calves and significantly reducing the fatigue of the passenger.