Track Linear Actuators: When a Rail Beats a Tube

Most linear actuators are tubes: a rod extends from a cylinder, pushes between two mounting eyes, and the load swings through a shallow arc as it moves. That design covers a huge range of jobs — but not all of them. Some mechanisms do not swing. They slide: a sofa bed pulls straight out, a footrest travels forward before it tilts, a panel glides along a frame. For those movements there is a different form of actuator, the track (rail) actuator, and choosing between the two shapes is mostly a question of how your mechanism actually moves. This guide explains how a track actuator is built, when a rail beats a tube, and how the three track models in the Zhiheng range we stock at HyHaven differ.

How a track actuator works

A track actuator replaces the extending rod with a fixed rail and a moving carriage. The motor drives the carriage along the rail in a straight line, and your mechanism bolts to the carriage. Two things follow from that construction. First, the moving part cannot wander sideways — the rail guides it for the whole travel, so alignment is built into the actuator instead of depending on your frame to keep everything true. Second, the whole drive stays flat: there is no long rod sweeping out of a tube, so the unit packages neatly inside a furniture frame or under a seat. All three models below have built-in limit switches that stop the carriage at both ends of travel, and all three are sealed to IP43 for indoor duty.

When a rail beats a tube

• Your mechanism pivots. If the load swings between two mounting eyes — a hatch, a lid, a recline pivot — a tube actuator is the natural fit. Its rod is designed to work at changing angles.
• Your mechanism slides in a straight line. If the moving part runs along a guide — pull-out sofa beds, sliding footrests, recliner linkages, sliding doors and panels, seat rails — a track actuator matches the motion exactly, and the carriage cannot drift off line.
• You need long travel. This is the track design's strongest card. A tube actuator's rod gets long, exposed and hard to package as stroke grows; a rail simply gets longer. The TP41 and TP61 are stocked in strokes from 100 to 450 mm, and the TP41's factory range runs from 30 to 1,000 mm as a custom order — travel a tube actuator reaches awkwardly, if at all.
• Space is flat and shallow. Inside a sofa base or under a sliding panel there is often height for a rail but no room for a tube and its extended rod. The track profile is built for exactly that envelope.

The three models we stock

HH-LA-TP41 — the standard 6,000 N rail. 6,000 N of push force and 4,000 N of pull, running at 5 mm/s under load on 12V or 24V DC. Duty rating is S2-10MIN (a maximum of 10 minutes continuous running), which suits furniture positioning duty comfortably. Installation length is the stroke + 100 mm, the mounting hole is Ø10.2 mm, and the operating temperature range is 0°C to +50°C. Stocked strokes run 100–450 mm; any stroke in the 30–1,000 mm factory range is available as a custom order.

HH-LA-TP61 — the wide-temperature version. The same platform and the same headline figures: 6,000 N push, 4,000 N pull, 5 mm/s under load, 12V or 24V DC, IP43, built-in limit switches. Two things set it apart: an operating temperature range of −26°C to +65°C, for mechanisms that live in unheated spaces, vehicles or warm enclosures; and an end-mounted hexagonal motor housing, which suits frames that give the actuator a different mounting envelope. Choose it over the TP41 when the temperature range or the housing shape decides the fit.

HH-LA-TP21 — the light rail. A smaller unit for lighter mechanisms: 2,000 N push and 1,500 N pull at 4 mm/s, on 12V or 24V DC, IP43 with built-in limit switches. Installation length is the stroke + 190 mm, the mounting hole is Ø10 mm, and the operating temperature range is −26°C to +65°C. Stocked strokes run 100–450 mm. It is the right size for footrest slides, lighter panels and mechanisms where 6,000 N would be wasted.

Fitting and control notes

• Check the closed length before anything else. On the TP41 the closed unit measures stroke + 100 mm, on the TP21 stroke + 190 mm. Measure the space your frame actually offers and pick the stroke from the dimension drawing on the product page, not the other way round.
• Control is standard 12V/24V gear. The TP series takes standard 12V/24V DC control equipment, with controllers sold separately. One warning that saves returns: the TP actuators do not run on the 29V M02/M03 furniture control boxes — those belong to the HH-LA-U9, U10, U4 and U9-2 actuator system. If your mechanism already has a 12V or 24V supply, the TP rail usually drops straight in; ask us to confirm the match before ordering.
• Force is rarely the limit. At 6,000 N (about 612 kg of push) the TP41 and TP61 out-push any sofa or panel mechanism; if a sliding mechanism feels weak, check friction and rail alignment in the frame first.

Every actuator mentioned here carries a 12-month warranty. Not sure whether your mechanism wants a rail or a tube? Send us a photo or a sketch of the movement to support@hyhavenstore.com and we will tell you which family it belongs to before you spend anything.

FAQ

Can a track actuator replace a tube actuator in my mechanism? Only if the mechanism itself runs straight. If the moving part is guided along a line — a sliding footrest, a pull-out bed, a panel — yes, and the carriage will usually run truer than the rod it replaces. If the load pivots between two mounting eyes, keep the tube actuator; a carriage cannot follow an arc.

How long can the travel be? Stocked strokes run from 100 to 450 mm across the range. On the TP41, the factory range extends from 30 to 1,000 mm as a custom order, which covers long pull-out and panel travel that no stocked tube actuator handles cleanly.

Which model should I pick for a cold or hot environment? The TP61 and the TP21 are rated from −26°C to +65°C. The TP41 is rated from 0°C to +50°C, which is fine for heated indoor furniture but not for unheated or vehicle installations.

Do TP actuators work with the HH-CB-M02 or HH-CB-M03 control boxes? No. Those boxes output 29V DC and belong to the 29V furniture system (HH-LA-U9, U10, U4 and U9-2). The TP series runs on standard 12V/24V DC control equipment, sold separately — match the controller to your supply voltage.

What warranty do the track actuators carry? All three models — TP41, TP61 and TP21 — carry a 12-month warranty.