Doppeltwirkender Dämpfungszylinder 210 bar //
Baureihe: HZD4
General Information
The HZD4 series cylinders are double-action pressure cylinders with end position damping that are universally applicable due to their various models and sealing variants. The damping is not adjustable. The piston rod guide is designed to be screwable for maintenance tasks. The piston rod consists of high-tensile structural steel with an approximately 25 μm hard chromium-plated layer. Other materials and coat-ings are available on request.
Please consult us in case of radial forces and non-vertical installation.
Technical Information | |
|---|---|
| Maximal operating pressure | = 210 bar |
| Testing pressure | = 280 bar |
| Piston Ø | = 40 – 125 mm |
| Accepted temperature range of the hydraulic fluid | = -20°C up to +80°C |
| Hydraulic fluid | = mineral oil (HL, HLP) according to DIN 51524 & DIN 51525 (standard) |
| Stroke speed | = ≤ 0,5 m/s |
Length and stroke tolerances according to DIN7168g (see >>Technical Information)
Mounting Type | Data Sheet | ||
|---|---|---|---|
| A | Base-side ball-and-socket joint | (DO – Standard) | >> Bauform A |
| E | Rod-side trunnion | >> Bauform E | |
| F | stangenseitiger Flansch | >> Bauform F |
Accessories | Data Sheet | ||
|---|---|---|---|
| A-.. | Rod clevis | (GE-DO subject to maintenance) | >> Gelenkkopf A |
| B-.. | Rod clevis | (GE..HO wartungspflichtig) | >> Gelenkkopf B |
| G-.. | Gabelkopf | (Tolerance field H11) | >> Gabelkopf G |
Additional Information
Order Key
Click >> this linkto download the order key in PDF format.
The pipe thread of the connecting bore is designed according to ISO 228/1. The position along the perimeter can be changed (Standard P7/P8).
For long strokes, the support width of the piston rod in the cylinder tube can be changed in order to reduce the load on the guide system when fully extended. This also depends on the type of installation and the design of the cylinder.
D1 - Groove ring and scraper made of polyurethane and a compact seal (NBR) on the piston (standard) | |
|---|---|
| Temperature range | -30°C to +80°C |
| Hydraulic fluid | Mineral oil |
| Stroke speed | ≤ 0,5 m/s |
| Application | Standard seal set for normal operating conditions, offers very high resistance to wear |
D2 - Axial seal ring set consisting of PTFE STEP SEALS (O-ring seal made of NBR), double scraper (polyurethane) and a PTFE Glyd ring (NBR O ring seal) on the piston | |
|---|---|
| Temperature range | -30°C to +100°C |
| Hydraulic fluid | Mineral oil, flame-retardant hydraulic fluids HFA and HFB up to +40°C |
| Stroke speed | ≤ 1 m/s |
| Application | Seal set for high sliding speeds, no stick-slip effect, higher leakage compared to D1 and D3 |
D2V - Axial seal ring set consisting of PTFE STEP SEALS (O-ring seal made of Viton) Double scraper(Viton O-ring seals) and a PTFE Glyd ring (Viton O ring seal) on the piston | |
|---|---|
| Application | Sealing set for high sliding speeds, no stick-slip effect, greater leakage than in the case of D1 and D3, for higher temperatures (+200°C) and fluids on a phosphate ester basis (HFD) |
D3 - Tandem sealing set consisting of groove ring (polyurethane) and PTFE STEP SEAL and a compact seal (NBR-PTFE) on the piston | |
|---|---|
| Temperature range | -30°C to +80°C |
| Hydraulic fluid | Mineral oil |
| Stroke speed | ≤ 0,8 m/s |
| Application | Sealing set for high loads at minimum leakage, smooth-running stroke movements |
Theoretical cylinder force in [kN] (efficiency = 100%)
Die Endlagendämpfung gewährleistet ein weiches Abbremsen der Hubgeschwindigkeit des Hydraulikzylinders in den beiden Endlagen. Die Dämpfung wird erreicht durch eine Drosselung des Flüssigkeitsstromes, wobei die aus der Bewegung sich ergebende kinetische Energie in Wärme umgewandelt wird.Die kinetische Energie E als Produkt aller auf die Kolbenstange wirkenden Massen m und der Hubdeschwindigkeit v bei Dämfungsbeginn, darf das Arbeitsvermögen W der Dämpfung nicht überschreiten.
Ausfahrbewegung
| FB = m x a + AK x p | FB [N] | = | Bremskraft |
| m [kg] | = | moving mass | |
| AK [cm²] | = | Piston area | |
| p [N/cm²] | = | Systemdruck | |
| v [m/s] | = | Stroke speed | |
| s [m] | = | Damping distance | |
| a [m/s²] | = | Verzögerung | |
| a [m/s²] | a=v²/2s |
Einfahrbewegung
| FB = m x a + AR x p | FB [N] | = | Bremskraft |
| m [kg] | = | moving mass | |
| AK [cm²] | = | Piston area | |
| p [N/cm²] | = | Systemdruck | |
| v [m/s] | = | Stroke speed | |
| s [m] | = | Damping distance | |
| a [m/s²] | = | Verzögerung | |
| a [m/s²] | = | 1 bar ~ 10 |
Für den vertikalen Einbau muß zur Bremskraft FB noch die Gewichtskraft der äußeren Last und der Kolbenstange addiert bzw. subtrahiert werden.Die Zylinderreibung wird bei Berechnung vernachlässigt.
Berechnung des mittleren Dämpfungsdrucks
| PD = FB/AD | PD [N/ cm²] | = | Average damping pressure |
| FB [N] | = | Bremskraft | |
| AD [cm²] | = | Piston area | |
| 1 bar ~ 10 |
Bei einem zu hohen mittleren Dämpfungsdruck muss entweder die Dämpfungslänge oder der Systemdruck verringert werden.
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