• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Summary The invention relates to a rocker cylinder device (10) for a lifting boom (2) of an industrial truck (1), the rocker cylinder device (10) having at least one double-acting hydraulic rocker cylinder (11), which is formed by a piston rod fitted with a piston (14). (13) and a cylinder & (12), where the rocker cylinder (11) has a pressure chamber (15) on the piston side and a pressure chamber (17) on the piston rod side. The object of providing such a tilting cylinder device which is improved in terms of efficiency when tilting the lifting boom is solved according to the invention in that the tilting cylinder (11) is arranged at the industrial truck (1) and the lifting boom (2) so that the pressure chamber (17) can act in the direction of the piston rod side. Forward tilt (V) of the boom (2) and pressure chamber (15) on the carbon side in the direction of tilt (H) of the boom (2). Fig. 1
    公开号:SE1250735A1
    申请号:SE1250735
    申请日:2012-06-29
    公开日:2013-01-21
    发明作者:Stephan Scharf
    申请人:Still Gmbh；
    IPC主号:
    专利说明:

    Description The invention relates to a rocker cylinder device for a boom of an industrial truck, wherein the rocker cylinder device has at least one double-acting hydraulic rocker cylinder, which is formed by a piston rod and a cylinder and a pressure chamber arranged on the piston rod side.
    Such double-acting tilting cylinders for a lifting boom of an industrial truck, for example a counterweight truck, are designed as a differential cylinder with a piston rod projecting on one side of the cylinder tube. In this case, a piston rod of smaller diameter is connected to the piston of the rocker cylinder. Such rocker cylinders can be characterized by different pressure surfaces in the ram pressure chambers. The pressure chamber on the piston side has a circular pressure surface, which corresponds to the entire piston surface or cross-sectional area of the cylinder tube. At the pressure chamber on the piston rod side, a ring surface is designed as a pressure surface, which is the piston surface reduced by the surface of the piston rod.
    Kanda tilt cylinders are with opposite spirits on! Dada sides attached to the industrial truck and the tiltable lifting boom. In this case, the cylinder tube can be fixed to the vehicle chassis with a rear boom facing the lifting boom and with the projecting piston rod arranged in front of the lifting boom at the front end being fixed to the lifting boom. Such a device of a tilting cylinder for a lifting boom is known, for example, from DE 86 02 229 U1. In addition, a completely opposite device of a tilting cylinder jig, in which the piston rod is arranged rearwardly, is previously directed away from the lifting boom at the vehicle chassis and fixed with the rear end to the vehicle chassis and where the cylinder tube is projecting and with the front end fixed to the lifting boom. Such an arrangement of a tilting cylinder for a lifting boom is known, for example, from EP 0 458 184 B2.
    In such a double-sided arrangement of the rocker cylinder, the pressure chamber acts on the piston side, provided with the piston surface as a pressure surface in the direction of a forward inclination of the lifting boom. The pressure chamber on the piston side with the ring surface as the pressure surface acts in the direction of a rear inclination of the lifting boom. Thereby, for forward inclination of the lifting boom, an contact surface is provided for the pressure arising in the pressure chamber, which corresponds to the piston surface of the piston, and for the rear inclination the pressure of an attack surface for the pressure arising in the rocker cylinder, which corresponds to the smaller ring surface. In the case of known devices of tilting cylinders a lower pressure and a larger volume flow is thus required for 1 forward inclination of the lifting boom due to the active piston surface as pressure surface in the pressure chamber on the piston side and for the rear inclination of the lifting boom a pressure surface is required as the pressure surface in the pressure chamber on the piston rod side a reduced volume flow.
    Due to the tilting device of the lifting boom at the vehicle chassis, however, the center of gravity of the lifting boom is usually with a load present with respect to the vehicle body lying against that of the tilting shaft of the lifting boom on the side turned away from the vehicle chassis. A large force and thus effective pressure surfaces at a tilting cylinder for the forward inclination and the rear inclination of the lifting boom are required for the rear inclination of the lifting boom - a higher pressure affects the forward inclination of the lifting boom. In known devices of tilting cylinders, in which the pressure chamber provided on the piston side, with the piston surface as a pressure surface in a forward inclination direction of the lifting boom and the pressure chamber arranged on the piston side with the smaller annular surface as a pressure surface in a rearward inclination direction of the lifting boom is effective. for the rearward inclination in relation to the forward inclination of the boom, a disproportionately higher pressure is required.
    With increasing pressure, however, the lacquer at the rocker cylinder increases, which usually rises linearly with the pressure. These leaks lead to a loss of efficiency and can lead to damage to the environment when leaving the environment.
    The object of the invention is to provide a tilting cylinder device according to the preamble, which is improved with respect to the efficiency when tilting the lifting boom.
    This breath is solved according to the invention in that the tilting cylinder is designed so as to attach to the industrial truck and to the lifting boom so that the pressure chamber on the piston rod side is operative in the direction of the forward inclination of the boom and the pressure chamber on the piston side in the direction of the rear boom.
    The object of the invention is, in contrast to a known device of a tilting cylinder, to use the effective contact surfaces for the emerging pressure and for the tilting of the lifting boom for the pressure chamber on the piston side to use stone piston surfaces as effective pressure surfaces. Compared with a known device of a tilting cylinder, a requirement for the device of the tilting cylinder according to the invention is for the tilting of the boom with the same dimensions of the tilting cylinder and the same required work for the tilting of the boom a smaller pressure, whereby an improvement of efficiency can be achieved. In the arrangement of the tilting cylinder according to the invention, the pressure chamber 2 acts on the side of the piston rod with a smaller annular surface as a pressure surface in the direction of forward inclination of the lifting boom. In the case of a loaded load at the lifting boom, the work for forward tilting of the lifting boom is usually taken over by the picked-up and forward-pulling load, so that a forward inclination can be achieved without pressure work or with less pressure work in the pressure chamber on the piston rod side, so that the reduced surface area. a device of the tilting cylinder according to the invention does not cause any negative effects. In addition, the risk of leakage during the arrangement of the tilting cylinder according to the invention is significantly reduced due to the reduced pressure level when the lifting boom is tilted back.
    According to a preferred embodiment of the invention, the tilting cylinder is fixed with a first articulation point at the industrial truck and with a second articulation point at the lifting boom, the [other articulation points being arranged on one side of the tilting cylinder. With a one-sided arrangement of the two articulation points of the rocker cylinder, to which the rocker cylinder is connected at the boom and at the industrial truck, the rocker cylinder on the side of the piston can be actuated at the rear tilt and the pressure chamber on the piston rod side of the boom.
    Such a one-sided arrangement of the dead joints at the tilting cylinder can be provided at a low cost, since the piston rod of the tilting cylinder is arranged water against the lifting boom with the assigned part projecting from the cylinder tube and is fixed to the industrial truck.
    The cylinder ring of the tilting cylinder is in this case suitably fixed to the lifting boom.
    With the device according to the invention of the tilting cylinder, energetic advantages can be given by the possible reduction and lowering of the pressure level for the rear inclination of the lifting boom.
    In particular, it is possible to provide the tilting cylinder device for tilting the lifting boom backwards with a hydraulic storage device, with which an energy recovery takes place when lowering a load at the lifting boom. Such a hydraulic storage device is filled for energy recovery during a collection movement with pressure medium under pressure. When arranging the tilting cylinder according to the invention, a backward inclination of the lifting boom can already be achieved with a applied pressure in the storage device from such a useful collecting movement, so that for the rear inclination of the load boom a lower energy consumption can be provided and for the rearward inclination the pressure in the storage device can be used.
    Further advantages and features of the invention will become more apparent from the embodiment shown in the schematic figure. The figure shows an industrial truck 1, for example a counterweight forklift, with a tiltable boom 2. The industrial truck 1 has a vehicle chassis 3, which is for instance formed by a frame and / or a load-bearing driver's roof.
    The vehicle chassis 3 is in the front front area 2 facing the lifting boom 2 with front wheel 4 and in the rear, rear rear area away from the lifting boom is provided with at least one rear wheel 5, which is usually designed as a swivel wheel.
    The lifting boom 2 is in the front area of the vehicle chassis 3 pivotally arranged around a horizontal tilting shaft 6 forward V and rear H. Lifting boom but 2 is provided with a height-adjustable load receiving device 7, for example a load fork, for handling a load L. A forward inclination V of the lifting boom 2 corresponds to a tilting movement of the lifting boom 2 counterclockwise around the tilting shaft 8, the lifting boom 2 in the upper area moving away from the vehicle chassis 3. A rear slope H of the lifting boom 2 corresponds to a tilting movement of the lifting boom 2 clockwise around the tilting shaft 6. against the vehicle chassis 3.
    In the case of an industrial truck 1 designed as a counterweight forklift, a counterweight 8 is further arranged in the rear of the vehicle chassis 3 for leveling a loaded load L.
    As a tilting device for tilting the lifting boom 2, a tilting cylinder device 10 is provided, which at least comprises a tilting cylinder 11. The tilting cylinder 11 is designed as a double-acting differential cylinder and consists of a cylinder tube 12 and a piston rod 13. The piston rod 13 is fitted or connected to a cylinder tube 12. piston 14 and extends with one spirit on one side out of the cylinder tube 12. The tilting cylinder 11 has a pressure chamber 15 on the piston side, the effective pressure-affected pressure surface 16 of which is formed by the piston surface of the piston 14 and thus the cross-sectional surface of the cylinder tube 12. The tilting cylinder 11 further has a pressure chamber 17 on the piston rod side, the effective pressure-coated pressure surface 18 of which is formed by the annular surface, which corresponds to the surface of the piston 14 minus the surface of the piston rod 13.
    According to the invention, the tilting cylinder 11 is arranged so as to sit on the vehicle chassis 3 and the lifting boom 2, so that the pressure chamber 17 on the side of the piston rod acts with the pressure surface 18 formed by the ring surface in the direction of a forward inclination V of the lifting boom 2 and the pressure chamber 15 on the larger piston side. The pressure surface 16 formed by the piston surface in the direction of a rearward slope H of the lifting boom 2. 4 In this case a first articulation point 20, with which the tilting cylinder 11 is arranged at the vehicle chassis 3 and a second articulation point 21, with which the tilting cylinder 11 is arranged at the lifting boom 2, arranged on one side and thus with respect to the tilting cylinder 11 arranged on one side of the tilting cylinder 11.
    In the tilting cylinder 11 according to the invention, the piston rod 13 projecting from the cylinder tube 12 and provided with the piston 13 is arranged forwards and thereby arranged with the side facing the lifting boom and articulated to the front end at the leading point 20 to the vehicle chassis 3.
    The cylinder & 12 of the tilting cylinder 11 are articulated at the articulation point 21 and at the lifting boom 2.
    According to the device according to the invention of the tilting cylinder 11, the piston rod 13 is thus arranged on the side of the lifting boom at the vehicle chassis 3 and the cylinder tube 12 at the lifting boom 2, both articulation points 20, 21 being in front of the tilting cylinder 11 and thus between the tilting cylinder 11 and the lifting boom 2.
    When the lift boom 2 is tilted forward around the rocker shaft 8, a loaded load L acts as a support so that the work with the front tilt boom V can 2 usually take place without pressure work or with less pressure in the pressure chamber 17 of the rocker bar 11 provided on the side of the rocker bar 11. the tilting cylinder 11. When tilting back H of the lifting boom 2 around the tilting shaft 6 with a loaded load L, in contrast to the forward inclination V due to the position of the load L with respect to the tilting shaft 6, a larger work is required. Through the pressure chamber 15 on the piston side with the large effective pressure surface 16 of the tilting cylinder 11, the required work for tilting the lifting boom 2 at a tilting cylinder 11 according to the invention can be achieved with a reduced pressure. The lowering of the required pressure level for the rear slope H of the lifting boom 2 in the arrangement of the rocker cylinder 11 according to the invention leads to an improvement of the efficiency and makes it possible to drive the rear slope of the lifting boom 2 with a hydraulic storage device filled during a payload.
    权利要求:
    Claims (5)
    [1]
    A tilting cylinder device for a lifting boom of an industrial truck, wherein the tilting cylinder device has at least one double-acting hydraulic tilting cylinder, which is formed by a piston rod provided with a piston and a cylinder tube, where the tilting cylinder has a pressure chamber on the piston side and a piston cylinder (11) is arranged at the industrial truck (1) and the lifting boom (2) in such a way that the pressure chamber (17) on the piston rod side can act in the direction of forward inclination (V) of the lifting boom (2) and the pressure chamber (15) on the piston side in the direction of retraction (H) of the lifting boom (2).
    [2]
    Rocker cylinder device according to claim 1, characterized in that the rocker cylinder (11) is fixed with a first pivot point (20) at the industrial truck (1) and with a second pivot point (21) at the lifting boom (2), the padded pivot points (20, 21) are arranged on one side of the tilting cylinder (11).
    [3]
    Rocker cylinder device according to Claim 1 or 2, characterized in that the piston rod (13) of the rocker cylinder (11) is arranged with the part projecting water out of the cylinder tube (12) against the load boom (2) and is fixed to the industrial truck (1).
    [4]
    Rocker cylinder device according to one of Claims 1 to 3, characterized in that the cylinder tube (12) of the rocker cylinder (11) is fixed to the lifting boom (2).
    [5]
    Rocker cylinder device according to any one of claims 1 to 4, characterized in that the rocker cylinder device (10) for reclining (H) of the lifting boom (2) is provided with a hydraulic storage device, with which when loading a load (L) at the lifting boom (2) an energy recovery achievement. 6 18663 / P11090-DE / FST = EM-FS10427 20.07.2011 - Geirhos
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    同族专利:
    公开号 | 公开日
    DE102011108176A1|2013-01-24|
    SE538316C2|2016-05-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE8602229U1|1986-01-29|1986-03-06|Linde Ag, 65189 Wiesbaden|A lift truck with a tilting mast|
    DE4022450A1|1990-05-22|1991-11-28|Linde Ag|FORKLIFT|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE201110108176|DE102011108176A1|2011-07-20|2011-07-20|Tilt cylinder arrangement for mast of industrial truck e.g. counterbalance forklift truck, has tilting cylinder with piston-side pressure chamber and piston rod-side pressure chamber|
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