[et_pb_section fb_built=”1″ _builder_version=”4.19.4″ _module_preset=”default” custom_margin=”-30px||||false|false” custom_padding=”||||false|false” global_colors_info=”{}”][et_pb_row _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Hydraulic cylinders<\/strong> are straight-line devices<\/strong> for converting<\/strong> hydraulic power into work power (mechanical energy). Today, a cylinder is an indispensable device<\/strong> in the hydraulic circuit. It is the link<\/strong> between the hydraulic circuit<\/strong> and the working machine<\/strong>.<\/p>\n In contrast<\/strong> to rotary drives<\/strong> (hydraulic motors), the hydraulic cylinder performs translatory<\/strong> (straight-line) movements<\/strong>. In doing so, it transfers the<\/strong> forces<\/strong> to the working machine<\/strong>.<\/p>\n Cylinders have a wide range<\/strong> of applications<\/strong> and can be found in a wide variety of machines and vehicles. F = p \u22c5 A in kN<\/strong><\/p>\n Where F is the force in newtons<\/strong>, p is the pressure in bar<\/strong>, and A is the cylinder area<\/strong> (piston or ring area). Basic information on the calculation of hydraulic cylinders<\/strong> can be found in our articles.<\/p>\n [\/et_pb_text][et_pb_image src=”https:\/\/hytrade24.com\/hydraulikmagazin\/\/wp-content\/uploads\/2023\/01\/Doppelt-wirkender-hydraulikzylinder.jpg” alt=”Double acting hydraulic cylinder” title_text=”Double acting hydraulic cylinder” align=”center” _builder_version=”4.19.4″ _module_preset=”default” width=”70%” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n When using<\/strong> hydraulic cylinders<\/strong>, the following advantages<\/strong> result for linear movements in working machines:<\/p>\n [\/et_pb_text][et_pb_text _builder_version=”4.19.5″ _module_preset=”default” header_4_font_size=”20px” global_colors_info=”{}”]<\/p>\n Hydraulic cylinders essentially consist of a cylinder tube<\/strong>, a piston rod<\/strong> and a piston<\/strong>. The piston rod<\/strong> moves<\/strong> along the cylinder when fluid pressure<\/strong> is applied to the piston<\/strong>.<\/p>\n [\/et_pb_text][et_pb_image src=”https:\/\/hytrade24.com\/hydraulikmagazin\/\/wp-content\/uploads\/2023\/01\/Schnittdarstellung-hydraulikzylinder.jpg” alt=”Sectional view of a double-acting hydraulic cylinder” title_text=”Sectional view of hydraulic cylinder” align=”center” _builder_version=”4.19.4″ _module_preset=”default” width=”50%” custom_margin=”||50px|||” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n In addition to industrial applications, cylinders are also used<\/strong> in the automotive industry<\/strong>, aircraft industry<\/strong>, agriculture<\/strong> as well as mechanical engineering<\/strong>, construction<\/strong> and mining<\/strong>.<\/p>\n [\/et_pb_text][et_pb_text _builder_version=”4.19.5″ _module_preset=”default” header_5_font_size=”20px” header_6_font_size=”18px” global_colors_info=”{}”]<\/p>\n Hydrocylinders can be divided into two groups according to their mode of action:<\/p>\n Single-acting hydraulic cylinders have only one effective area, they can deliver their force in only one direction. The piston can be returned by a spring, the piston’s own weight or by external force.<\/p>\n [\/et_pb_text][et_pb_image src=”https:\/\/hytrade24.com\/hydraulikmagazin\/wp-content\/uploads\/2023\/01\/Hydraulikzylinder-einfach-wirkend-scaled.jpg” alt=”Single acting hydraulic cylinder” title_text=”Hydraulic cylinder single acting” align=”center” _builder_version=”4.19.4″ _module_preset=”default” width=”60%” custom_margin=”||50px|||” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.19.5″ _module_preset=”default” header_6_font_size=”18px” global_colors_info=”{}”]<\/p>\n These<\/strong> have two oppositely<\/strong> acting surfaces<\/strong>, of the same or different size.Unlike single-acting cylinders, they have two line ports “A” and “B”<\/strong>. By applying pressure via port “A” or “B”, the cylinder piston can transmit tensile or compressive forces in both stroke directions<\/strong>. Double-acting hydraulic cylinders can be found in a wide range of fluid power applications and are further subdivided<\/strong> into differential cylinders and synchronous cylind<\/strong>ers.<\/p>\n [\/et_pb_text][et_pb_image src=”https:\/\/hytrade24.com\/hydraulikmagazin\/\/wp-content\/uploads\/2023\/01\/Doppelt-wirkende-hydraulikzylinder.jpg” alt=”Double acting hydraulic cylinders” title_text=”Double acting hydraulic cylinders” align=”center” _builder_version=”4.19.4″ _module_preset=”default” width=”40%” custom_margin=”||50px|||” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.19.5″ _module_preset=”default” header_6_font_size=”18px” global_colors_info=”{}”]<\/p>\n Cylinder pistons can reach high speeds (> 1 m\/s)<\/strong> or have large masses<\/strong> to move. This can mean that the unbraked stop of<\/strong> the piston in the end position leads to damage to the cylinder<\/strong> and the machine. Hydraulic cylinders with end-position cushioning<\/strong> are usually used for these applications. This damping<\/strong> is normally installed in both end positions<\/strong>, i.e. on both rod and piston sides. The illustration shows a cylinder with end-position cushioning on the piston side. The damping is adjustable via a throttle valve<\/strong>.<\/p>\n [\/et_pb_text][et_pb_image src=”https:\/\/hytrade24.com\/hydraulikmagazin\/\/wp-content\/uploads\/2023\/01\/Hydraulikzylinder-mit-endlagendaempfung.png” alt=”Hydraulic cylinder with end position damping” title_text=”Hydraulic cylinder with end position cushioning” align=”center” _builder_version=”4.19.4″ _module_preset=”default” width=”50%” custom_margin=”||0px|||” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.19.4″ _module_preset=”default” text_font_size=”10px” global_colors_info=”{}”]<\/p>\n 1 Throttle valve<\/p>\n 2 Damping bushing<\/p>\n 3 Piston chamber<\/p>\n 4 Pistons<\/p>\n 5 Piston rod<\/p>\n [\/et_pb_text][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.19.4″ _module_preset=”default” text_font_size=”10px” global_colors_info=”{}”]<\/p>\n 6 Lock valve<\/p>\n 7 Cylinder base<\/p>\n A Connection piston side<\/p>\n B Rod side connection<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.19.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.19.5″ _module_preset=”default” header_6_font_size=”22px” global_colors_info=”{}”]<\/p>\n As a rule, hydraulic cylinders<\/strong> are sealed<\/strong> by elastic seals. These should have the following characteristics:<\/p>\n The frictional forces<\/strong> on the piston<\/strong> and piston rod<\/strong> are so high that a pressure of<\/strong> several<\/strong> bar is required to set the cylinder in motion.<\/p>\n For cylinders with two piston rods (synchronous cylinders), the friction<\/strong> is higher<\/strong> than for a differential cylinder with one piston rod. Without load<\/strong>, a minimum pressure of 10 bar<\/strong> is recommended for hydraulic cylinders with one piston rod to ensure safe retraction and extension<\/strong>.<\/p>\n [\/et_pb_text][et_pb_text _builder_version=”4.19.5″ _module_preset=”default” header_6_font_size=”22px” global_colors_info=”{}”]<\/p>\n
The maximum<\/strong> transmittable cylinder force<\/strong> “F” depends on<\/strong> the maximum permissible operating pressure “p”<\/strong> and the effective area “A”<\/strong>. Under ideal conditions, i.e. neglecting frictional influences, the following applies:<\/p>\nAdvantages of hydraulic cylinders<\/h3>\n
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Structure of a hydraulic cylinder and areas of application<\/h4>\n
Types of hydraulic cylinders<\/h5>\n
Single acting cylinders<\/h6>\n
Double acting cylinders<\/h6>\n
End-position cushioning in a hydraulic cylinder<\/h6>\n
Hydraulic cylinder sealing<\/h6>\n
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Hydraulic cylinder manufacturer<\/h6>\n