This utility model relates to the field of automotive seat technology and discloses a single-drive four-way adjustable backrest support mechanism, including a backrest spring frame, a synchronous drive
assembly, and adjustment cables. The aforementioned single-drive four-way adjustable backrest support mechanism drives a first chain and a second chain to move simultaneously via a
drive wheel, thereby controlling the tightening or loosening of four adjustment cables. This, in turn, pushes the backrest spring frame to conform to the
human body as needed to provide support. It has advantages such as good overall integrity, light weight, simple molding, low cost, large support area, uniform force distribution, and resistance to wear and loosening, improving backrest comfort and reliability. It also greatly simplifies the drive
system, reduces parts, and avoids abnormal
noise. The synchronous drive
assembly, as a
modular design, is more in line with the current trend of lightweight and cost-effective vehicles, improving product competitiveness, and its simple structure makes it easier to match with all vehicle models.