Products

Product Description

A power spring (Prestressed), when installed on a product, appears similar in appearance to a traditional power spring. However, because it is wound in the opposite direction, it takes on an "S" shape when released it. Compared to traditional power springs, power springs(Prestreessed) can provide a more streamlined force output and offer more working turns and greater force within a limited space. 

A power spring is a flat strip of steel coiled into a spiral that works like a compact energy storage device. When the spring is wound up, it stores energy as torque, and as it unwinds, it releases that energy smoothly to create a steady, turning motion. This makes it ideal for mechanisms that require a smooth return movement or controlled retraction, rather than a sudden pull.

Made from high-carbon steel or stainless-steel strips, Teng Yao’s power springs combine excellent fatigue resistance with stable torque output. The lineup includes open-band designs for compact assemblies like timers and clocks, multi-layer types for long-stroke or heavy-duty retraction systems, and housed versions for convenient integration in seat-belt retractors, vacuum cleaners, and other automatic rewind mechanisms.

A constant force spring is a flat strip of stainless or carbon steel tightly wound into a coil. When pulled, this constant tension spring delivers nearly uniform tension from start to finish, unlike ordinary coil springs, which get stiffer as they stretch. This steady force makes constant force spring applications ideal for tools and systems that require smooth, controlled motion or balanced lifting.

Teng Yao’s constant springs cover a broad range of designs. Models vary by end attachment – such as T-tab, round-hole, or double-hole mounts – to suit different installation styles. Other options include crimp or bent-over ends for guided or electrical applications, as well as keyhole designs for quick-release assembly. Specialized versions are also available, including perforated types for high-speed or long-stroke movement and non-magnetic options for use in precision electronic or medical equipment.

Compact, durable, and customizable in force and size, our springs with constant force are used in adjustable desks, printer carriages, sliding panels, and automation systems to ensure smooth, consistent performance over long service life.

A motor brush spring, also known as a constant-pressure spring for the carbon brush, maintains steady contact between the brush and the commutator to ensure smooth current flow. This consistent pressure minimizes sparking, noise, and electromagnetic interference, allowing the brush to wear evenly for a longer service life and quieter motor performance.

Teng Yao’s carbon brush springs are available in diverse configurations to meet specific operational needs. Compact types deliver precise tension for household appliances and handheld power tools, while long-stroke designs sustain constant force in continuous-duty motors, pumps, and electric vehicles. Deep-reach models fit recessed brush holders in generators and alternators, and corrosion-resistant variants perform reliably in automotive and outdoor systems exposed to moisture or heat. For dual-brush assemblies, twin-coil springs maintain balanced pressure across wider commutators, enhancing durability and efficiency in industrial and EV drive systems.

A constant torque spring is a pre-stressed strip of stainless or carbon steel wound into a coil to deliver a steady rotary force during winding and unwinding. When one end is mounted on a storage drum and the other on an output drum, it produces nearly uniform torque through the full range of motion.

This design ensures consistent and repeatable performance, making it ideal for applications such as cable reels, counterbalancing mechanisms, rotary dampers, and controlled return systems.

Teng Yao’s constant torque springs can be customized for torque value, dimensions, and material selection to suit specific installation needs. Their compact form and smooth, stable operation make them a reliable choice for automation equipment, precision instruments, and motion-control devices.

A variable force spring is a flat steel strip that pulls as it unwinds – and this pulling force increases the farther the variable spring is drawn out. In display and feeding systems, the spring connects to a sliding pusher plate: as shoppers remove items, the spring pulls the strip inward, and the pusher plate moves forward, keeping products nearly front-faced. The longer the stroke becomes, the stronger the spring pulls, compensating for reduced weight and maintaining smooth, continuous movement without jerks or gaps.

Teng Yao offers several configurations to support different presentation needs. Dense, tightly wound coils with curved crimped tabs provide stronger pull for heavier items such as canned drinks, glass cosmetics, or boxed goods. Looser coils with T-tab ends give gentler tension for lightweight products like snacks, pouches, blister packs, and stationery. For fixed installations, such as chilled cases, angled shelves, or track-based POP displays, designs with an extended arm and a round mounting hole provide stable screw-mounted positioning.