Демпфер фаркопа («яйця на фаркоп»)

What a Hitch Shock Absorber Is and How It Works

The damper is a polyurethane insert that sits around the ball of the coupling. A trailer coupler is built with a working clearance over the ball: without it the coupling would not drop on at all and would bind in turns. That same clearance produces the familiar thump every time the towing force changes sign — pulling away, braking, shifting gear or crossing a bump.

The damper fills that clearance with an elastic material. The ball is held against the face of the insert, the free movement disappears, and a change in force is passed on smoothly instead of as an impact. As a side effect it reduces wear on the ball and on the coupler itself, cuts shock loading on the towbar bracket and the rear of the body, and makes the rig calmer in traffic and when reversing.

Signs of a Worn Hitch Shock Absorber

The part works in compression and abrasion, so its life is finite and depends on towing mileage, trailer weight and road surface. Condition is checked every time the trailer is hitched: the insert comes off the ball and the working face is inspected.

• the knock is back in the coupling when pulling away, braking and crossing bumps
• the insert has lost its shape, flattened out or shows a clear wear step
• cracks, tears and crumbling material along the edges of the working face
• the part sits loose on the ball, rotates or slides out of place while driving
• the coupler closes with excessive effort or, on the contrary, with play
• uneven bright wear marks and scoring on the ball itself

A worn insert stops damping and starts acting as an abrasive, so it is replaced along with a check of the towbar bolts.

Polyurethane or Rubber

A rubber damper is softer and simpler to produce, but it soaks up grease from the coupling, swells in contact with road salt and goes stiff in the cold. After a couple of seasons it flattens, and the clearance between ball and coupler comes back together with the knock.

Polyurethane holds its shape under constant compression and stands up better to abrasion, oils and temperature swings, so the working profile of the insert survives much longer. At the same time the material stays elastic: it does not pass the impact through rigidly the way a plastic spacer would, it absorbs it. For trailers used all year round and towed fully loaded, that is the main argument for polyurethane. The Shore hardness is listed on every product page.

How to Choose a Hitch Shock Absorber

Selection is driven by ball diameter, the geometry of the coupling and the duty the rig sees. Dimensions are taken from the ball and the coupler themselves, not from the vehicle name.