ZURCON L-CUP

Get a quote

ZURCON L-CUP

Introduction

The rod sealing system is the most critical part of a hydraulic cylinder. Therefore it is expected that a rod sealing system performs under leak-free conditions in the static and dynamic state. Moreover it has to fulfil the lifetime of several thousand hours.

To meet these requirements, Busak+Shamban has developed the ZurconR L-CupR*, a highly effective and innovative rod sealing component.

*Patent for: Europe No. EP 0724693
*Patent for: US No. 5,649,711
*Patent for: China No. ZL 94193869.7

Zurcon L-Cup is a trade name.

Description
Zurcon L-Cup is a single acting polyurethane rod seal with a unique design offering a hydrodynamic backpumping ability over the complete working pressure range. The pressure-independent, hydrodynamic sealing ability of this new sealing element requires no lubrication reservoir in the sealing area and ensures a constant and controlled pressure distribution over a wide pressure range. Additionally, the seal’s dynamic sealing edge has a highly effective friction-reducing microstructure**. This structure creates a constant lubrication film to prevent dry running, thus enabling an increased service life.

The advantages of the new Zurcon L-Cup design lead to the following improved properties:

Advantages

– Hydrodynamic back-pumping ability over the complete working pressure range
– Low friction and therefore a reduction of heat generated
– Low breakout force even after a long period of non-operation
– Very low stick-slip
– Low increase in friction at increasing pressure
– High extrusion resistance
– Optimum geometry of the static sealing lip for higher sealing ability
– No entrapped oil and grease between seal and groove (due to notches)
– No pressure build-up between seal and groove OD
– Long service life

The new Zurcon L-Cup was designed in accordance with customers’ demands.
– Groove dimensions according to ISO 5597 Part 2
– Interchangeable with existing U-Cup grooves
– Installation into closed grooves
– Wear and extrusion resistant high-performance polyurethane

** Patent No. DE4300889C1

Application Examples

Zurcon L-Cup can be used in all applications in which
previously a conventional U-Cup was applied, such as:

  • Fork lifts
  • Agricultural machines
  • Light and medium mobile hydraulics
  • Industrial hydraulics
  • Machine tools
  • Injection moulding machines
  • hydraulic presses.

Another preferred solution for tandemrod sealing systems is the combination with the TurconR StepsealR K as primary seal and L-CupR as secondary seal, in conjunction with a double acting scraper.

Technical Data

Operating conditions

Pressure: Up to 40 MPa
Velocity: Up to 0.5 m/s
Temperature:-30_C to +80_C
Media: Hydraulic fluids based on mineral oil

Important Note:

The above data are maximum values and cannot be used at the same time. e.g. the maximum operating speed depends on material type, pressure, temperature and gap value.

Materials

Zurcon Z04
Special polyurethane Shore A 93
Colour: turquoise

Method of Operation

Busak+Shamban’s experience in the production of hydrodynamic back-pumping seals such as Turcon Stepseal K, and the use of Finite Element Analysis (FEA) and other laboratory tests have led to the development of Zurcon L-Cup. The main objective in the development of this seal was the ability to achieve an optimum pressure distribution over the complete pressure range.

The pressure distribution curve under the sealing lip needs to have a steep gradient on the high-pressure side and a shallow gradient on the rear of the seal.

operating principles and function of Zurcon L-Cup is similar to the well-known Turcon Stepseal K.

Friction

In Figure 34 the friction values of a conventional U-Cup and of Zurcon L-Cup are being compared. A high increase in friction of the U-Cup is clearly shown between approximately 5 and 15 MPa. This is due to the U-Cup being totally pressed on the rod surface at increased pressure, causing elimination of the oil reservoir and dry running of the U-Cup.

In comparison, the L-Cup shows only a low increase in friction which is due to the smaller contact area and better tribological behaviour. The result is a very low friction heat generation.

Zurcon L-cup figuur 34

Surface microstructure reduces the effective contact area to the rod and therefore the breakout and dynamic friction are reduced compared to seals with smooth sealing surfaces. The hollow spaces between the peaks of the seal and the rod are filled with oil even during long periods without operation. When starting the movement after this period, a lubrication film is still present. This reduction of a large surface contact area into many small contact points also prevents excessive breakout friction and stick-slip.

During short stroke oscillation, oil is retained in the microstructures. This result would be unlikely with smooth sealing surfaces where full contact with the rod causes the oil to be pressed out.

Friction Heat

The effect described above can be made visible by simply measuring the temperature. Figure 36 shows the increase in temperature on the rod surface caused by friction, measured at a pressure of 40 MPa after 20 000 cycles. This explains the prolonged service life of L-Cup.

Zurcon L-cup figuur 36

Test Conditions (Fig. 36)

Dimension: 50 x 60 x 11 mm
Pressure: 0/40 MPa
Velocity: 0.1 m/s
Temperature: ambient

 

Sealing Gap

The recommended gap dimensions described in Figure 37, depend on pressure and temperature.

Zurcon L-cup figuur 37

Design Instructions

Lead-in chamfers
In order to avoid damage to the rod seal during installation, lead-in chamfers and rounded edgesmust be provided on the piston rods. If this is not possible for design reasons, a separate installation tool must be used.

The minimum length of the lead-in chamfer depends on the profile size of the seal and can be seen from the following tables.

Zurcon L-cup figuur 38

 

Installation Recommendation

Zurcon L-cup figuur 39

 

Rod Dia. Groove Dia. Groove Width Ra- dius Ring Width Order No.
dN
f8
D
H10
L
+0.25
r
max.
T
6 10 4,5 0,2 3,6 RLM000060-Z04
8 12 3,6 0,2 3,2 RLM000080-Z04
8 16 5,0 0,3 4,2 RLS400080-Z04
8 16 6,3 0,3 5,7 RLS100080-Z04
10 18 6,3 0,3 5,7 RLS100100-Z04
12 16 3,6 0,2 3,2 RLM100120-Z04
12 17 4,0 0,3 3,6 RLM000120-Z04
12 20 6,3 0,3 5,7 RLS100120-Z04
12 22 8,0 0,3 7,2 RLS500120-Z04
14 22 6,3 0,3 5,7 RLS100140-Z04
15 21 5,0 0,3 4,5 RLM000150-Z04
15 23 5,0 0,3 4,2 RLS400150-Z04
16 22 6,0 0,3 5,4 RL38N0160-Z04
16 24 6,3 0,3 5,7 RLS100160-Z04
18 26 6,3 0,3 5,7 RLS100180-Z04
20 26 5,5 0,3 5,0 RLM000200-Z04
20 28 6,3 0,3 5,7 RL08N0200-Z04
22 28 5,0 0,3 4,5 RLM100220-Z04
22 29 5,6 0,5 5,0 RLS000220-Z04
22 30 6,3 0,3 5,7 RL08N0220-Z04
22 30 7,0 0,3 6,3 RL09N0220-Z04
25 33 6,3 0,3 5,7 RLS100250-Z04
25 35 8,0 0,3 7,2 RLS500250-Z04
26 36 11,0 0,3 9,9 RL17N0260-Z04
Rod Dia. Groove Dia. Groove Width Ra- dius Ring Width Order No.
dN
f8
D
H10
L
+0.25
r
max.
T
28 36 6,3 0,5 5,7 RLS100280-Z04
28 38 8,0 0,3 7,2 RL14N0280-Z04
28 38 11,0 0,3 9,9 RL17N0280-Z04
28 40 9,5 0,3 8,1 RLM000280-Z04
30 38 6,3 0,3 5,7 RLM000300-Z04
30 38 8,0 0,3 7,2 RL10N0300-Z04
30 40 11,0 0,3 9,9 RLM100300-Z04
32 40 7,0 0,3 6,3 RLM000320-Z04
32 42 8,0 0,3 7,2 RL14N0320-Z04
32 42 11,0 0,3 9,9 RLM100320-Z04
32 47 11,0 0,3 9,9 RL24N0320-Z04
35 43 6,3 0,3 5,7 RLM000350-Z04
35 45 8,0 0,3 7,2 RL14N0350-Z04
35 45 11,0 0,3 9,9 RL17N0350-Z04
36 44 6,3 0,5 5,7 RLS100360-Z04
36 46 6,9 0,3 5,5 RLM000360-Z04
36 46 10,0 0,3 9,0 RL16N0360-Z04
36 46 8,0 0,3 7,2 RLS500360-Z04
37 47 11,0 0,3 9,9 RL17N0370-Z04
38 48 11,0 0,3 9,9 RL17N0380-Z04
38 45 7,0 0,3 6,3 RLM000380-Z04
38 55 10,7 0,3 9,2 RL39N0380-Z04
38,6 50 8,0 0,3 7,2 RL37N0386-Z04
40 48
6,3
0,3 5,7 RLM400400-Z04
40 48 7,0 0,3 6,3 RL09N0400-Z04
40 48 9,0 0,3 8,1 RL11N0400-Z04
40 50 7,0 0,3 6,3 RL40N0400-Z04
40 50 8,0 0,3 7,2 RLS500400-Z04
40 50 10,0 0,3 9,0 RL16N0400-Z04
40 50 11,0 0,3 9,9 RL17N0400-Z04
40 52 9,0 0,3 8,1 RLM500400-Z04
40 55 9,4 0,4 8,1 RLM000400-Z04
45 53 8,0 0,3 7,2 RL10N0450-Z04
45 53 9,0 0,3 8,1 RL11N0450-Z04
45 55 8,0 0,3 7,2 RL14N0450-Z04
45 55 10,0 0,3 9,0 RL16N0450-Z04
45 60 9,4 0,4 8,1 RLM000450-Z04
46 56 11,0 0,3 9,9 RL17N0460-Z04
48 60 11,0 0,3 9,9 RL36N0480-Z04
50 58 8,0 0,3 7,2 RL10N0500-Z04
50 58 9,0 0,3 8,1 RL11N0500-Z04
50 60 8,0 0,3 7,2 RLS500500-Z04
50 60 10,0 0,3 9,0 RL16N0500-Z04
50 60 11,0 0,3 9,9 RL17N0500-Z04
50 65 11,0 0,4 9,9 RLM200500-Z04
50 65 12,5 0,4 11,3 RL26N0500-Z04
52 62 11,0 0,3 9,9 RL17N0520-Z04
55 63 9,0 0,3 8,1 RL11N0550-Z04
55 65 8,0 0,3 7,2 RL14N0550-Z04
55 65 10,0 0,3 9,0 RL16N0550-Z04
55 65 11,0 0,3 9,9 RL17N0550-Z04
55 70 11,0 0,4 9,9 RLM400550-Z04
56 71 12,5 0,4 11,3 RL26N0560-Z04
58 68 11,0 0,3 9,9 RL17N0580-Z04
60 68 9,0 0,3 8,1 RL11N0600-Z04
60 70 10,0 0,3 9,0 RL16N0600-Z04
60 70 11,0 0,3 9,9 RL17N0600-Z04
60 75 12,5 0,4 11,3 RL26N0600-Z04
63 75 9,6 0,3 8,6 RL20N0630-Z04
63 75 10,0 0,3 9,0 RLM000630-Z04
63 78 12,5 0,4 11,3 RL26N0630-Z04
65 73 7,0 0,3 6,3 RL09N0650-Z04
65 75 10,0 0,3 9,0 RL16N0650-Z04
Rod Dia. Groove Dia. Groove Width Ra- dius Ring Width Order No.
dN
f8
D
H10
L
+0.25
r
max.
T
65 75 11,0 0,3 9,9 RL17N0650-Z04
68 78 11,0 0,3 9,9 RL17N0680-Z04
70 80 8,0 0,3 7,2 RL14N0700-Z04
70 80 10,0 0,3 9,0 RL16N0700-Z04
70 85 12,5 0,4 11,3 RL26N0700-Z04
75 85 10,0 0,3 9,0 RL16N0750-Z04
75 85 11,0 0,3 9,9 RL17N0750-Z04
75 90 12,5 0,3 11,3 RL26N0750-Z04
80 92 9,6 0,3 8,6 RLM000800-Z04
80 95 12,5 0,4 11,3 RL26N0800-Z04
80 100 12,5 0,6 10,8 RLM100800-Z04
80 100 16,0 0,6 14,4 RL30N0800-Z04
85 100 13,1 0,4 11,8 RL27N0850-Z04
90 105 13,1 0,4 11,8 RL27N0900-Z04
90 105 12,5 0,4 11,3 RL26N0900-Z04
90 110 12,5 0,6 10,8 RLSA00900-Z04
95 110 13,1 0,4 11,8 RL27N0950-Z04
100 120 12,5 0,6 10,8 RLSA01000-Z04
100 120 16,0 0,6 14,4 RL30N1000-Z04
101,6 114,3 10,6 0,6 9,5 RLE304000-Z04
105 125 12,5 0,6 10,8 RL29N1050-Z04
110 125 12,0 0,4 10,8 RL25N1100-Z04
110 130 16,0 0,6 14,4 RL30N1100-Z04
115 135 16,0 0,6 14,4 RL30N1150-Z04
119 134 9,4 0,4 8,1 RL22N1190-Z04
120 135 12,5 0,4 11,3 RL26N1200-Z04
120 140 12,5 0,6 10,8 RLSA01200-Z04
120 140 16,0 0,6 14,4 RL30N1200-Z04
125 140 12,0 0,4 10,8 RL25N1250-Z04
125 145 16,0 0,6 14,4 RL30N1250-Z04
130 150 16,0 0,6 14,4 RL30N1300-Z04
135 155 16,0 0,6 14,4 RL30N1350-Z04
140 160 16,0 0,6 14,4 RL30N1400-Z04
142 157 9,4 0,4 8,1 RL22N1420-Z04
150 170 12,5 0,6 10,8 RL29N1500-Z04
150 170 16,0 0,6 14,4 RL30N1500-Z04
160 180 12,5 0,6 10,8 RLSA01600-Z04
160 180 16,0 0,6 14,4 RL30N1600-Z04
160 185 16,0 0,8 13,5 RLSC01600-Z04
180 205 20,0 0,8 18,0 RL32N1800-Z04
195 220 20,0 0,6 18,0 RL32N1950-Z04
200 220 16,0 0,6 14,4 RL30N2000-Z04
200 225 20,0 0,8 18,0 RL32N2000-Z04
220 240 16,0 0,6 14,4 RL30N2200-Z04
220 250 20,0 0,8 16,2 RLSE02200-Z04
250 280 20,0 0,8 16,2 RLSE02500-Z04

 

Merk

Busak Shamban

Beoordelingen

Er zijn nog geen beoordelingen.

Wees de eerste om “ZURCON L-CUP” te beoordelen

Het e-mailadres wordt niet gepubliceerd. Vereiste velden zijn gemarkeerd met *

WE’D LOVE TO HELP

Get a qoute