Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D33/00—Superstructures for load-carrying vehicles
  • B62D33/06—Drivers' cabs
  • B62D33/063—Drivers' cabs movable from one position into at least one other position, e.g. tiltable, pivotable about a vertical axis, displaceable from one side of the vehicle to the other
  • B62D33/067—Drivers' cabs movable from one position into at least one other position, e.g. tiltable, pivotable about a vertical axis, displaceable from one side of the vehicle to the other tiltable
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
  • F15B15/08—Characterised by the construction of the motor unit
  • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
  • F15B15/1423—Component parts; Constructional details
  • F15B15/1447—Pistons; Piston to piston rod assemblies
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
  • F15B15/20—Other details, e.g. assembly with regulating devices
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
  • F15B20/007—Overload

Definitions

• a hydraulic device a vehicle comprising such a hydraulic device and the use of such a hydraulic device for tilting of a cab arranged on a chassis
• the invention relates to a hydraulic device comprising a piston and a cylinder for a vehicle.
• the device is suitable to be used in heavy vehicles, e.g a lorry or the like, and may be used for connecting a chassis or frame of the vehicle with a cab for carrying out
• the invention is suitable for a vehicle comprising a chassis which supports a cab where the cab is intended, in the event of collision from the front, to be displaced backward.
• Deformation structure means a structure which is intended to be deformed at a given load when exposed to an impulse, for example generated by a collision. Deformation structures are used in
• This invention relates to a deformation structure which is intended to separate two elements fastened to one
• JP 0828346 discloses an example of a vehicle comprising a deformation structure which is used in a tiltable
• the vehicle comprises a cab which is supported by a frame via an upper bracket which is fastened to the cab and is connected rotatably to a lower bracket fastened to the frame.
• the lower bracket has a break indication and the cab is freed from the frame during a collision and the cab may move rearwards until the bracket reaches a stop element a stop
• Still another deformation structure for a tiltable cab is described in WO 03 / 101 809.
• the vehicle described therein comprises in a conventional manner a chassis and a cab which is supported on said chassis and at its lower end has a bearing plate which is fastened to a cab bracket.
• Cab bracket means a bracket which supports the cab.
• the cab bracket is arranged with a swivel joint.
• the cab bracket and the bearing plate are anchored to one another via, in the direction of the vehicle, a front rigid joint and at least one rear deformable joint, said cab being intended, in the event of collision in the direction from the front, to be displaced backward while rotation of the cab bracket around its swivel joint and deformation of the at least one rear deformable joint take place.
• deformable joint comprises a bolt which is fastened to said bracket and passes through a lead-through arranged in a deformable area of said bearing plate, where the geometry of the lead-through is such that it fixes said bolt in a radial direction at right angles to a
• An object of the invention is to provide a device which reduces force stresses in the event of an accident related to equipment or machinery comprising a
• the device may for example be used for improved impact energy absorbing properties in vehicles and the device is intended to allow an
• the invention is in particular suitable for a vehicle comprising a tiltable cab and having a deformable joint between the cab and the frame and another hydraulic connection between the cab and the frame which may be modified in a simple way in order to obtain the intended impact energy absorbing characteristics .
• a hydraulic device comprising a cylinder and a piston fitted at least partly in the cylinder.
• the piston is arranged to be able to move back and forth in the cylinder such that the overall length of the hydraulic device, comprising the cylinder and piston, may be varied.
• the piston comprises a piston rod and a piston disc.
• the piston disc divides the cylinder in the longitudinal extension in a first chamber and a second chamber.
• decrease of the volume of the second chamber, through which the piston extends imply an extension of the overall length of the hydraulic device by pushing the piston rod such that a longer part of the piston is extending out of the cylinder while a decrease of the volume in the first chamber and an accordingly increase of the volume of the second chamber corresponds to a pulling of the piston rod into the cylinder such that the part of the piston extending out of the cylinder is shortened.
• the control of the position of the piston rod is made by controlling the flow of hydraulic liquid to and from the first and second chambers.
• the hydraulic device is arranged with at least a first inlet opening in the first chamber to which hydraulic liquid may flow via a first, push pipe and to a second inlet opening in the second chamber via a second, pull pipe.
• the hydraulic device serving as the basic hydraulic element for the present invention is intended to be an ordinary hydraulic cylinder which may be controlled by the flow of hydraulic liquid to retract respectively to extend.
• the device according to the invention provided with an instant pressure relief arrangement. The arrangement is intended to react to an external force above a certain limit acting to extend or retract the piston rod or some other parts indicating the need of a pressure relief.
• the pressure relief arrangement may for example either be directly influenced by a sudden change of the pressure or a certain pressure value in the hydraulic device and thus be actuated directly by this pressure change or pressure, to be actuated by a triggering signal indicating the need of instant pressure relief in the hydraulic device or to be directly influenced by a relative movement of the parts connected by the hydraulic device.
• a signal may be triggered by some kind of safety system for the system comprising the hydraulic device indicating the need or desire of relieving the pressure instantly so as to allow the piston and cylinder to move essentially without any hydraulic forces acting to keep them in a specific position relatively each other.
• the pressure may be chosen as desired.
• the pressure should of course be chosen such that no other part of the hydraulic device is deformed or breaks before the pressure relief mechanism or be chosen so low that the pressure release mechanism will be released during ordinary use of the device.
• the piston disc of the hydraulic device may be adapted to break or rupture when subjected to a certain
• Another way of providing the hydraulic device with a pressure relief mechanism is to provide the first, push pipe and /or the second, pull pipe with a pressure release arrangement such that there is a controlled breakage of the first, push pipe and /or the second, pull pipe as a direct consequence of an increased pressure in the pipe or pipes or triggered by some safety mechanism.
• a pressure relief of the first, push pipe by breakage of the pipe will allow the piston rod to easily move into the cylinder and a correspondingly breakage of the second, pull pipe will allow the piston rod to be extended further with low resistance forces.
• the hydraulic device may be provided with a pressure release valve located in the first, push pipe and/or the second, pull pipe in order to provide a pressure relief of the hydraulic device.
• a pressure release valve located in the first, push pipe and/or the second, pull pipe in order to provide a pressure relief of the hydraulic device.
• all the above described pressure relief mechanisms of the hydraulic device may be actuated directly in response to an increased pressure or a pressure impulse in the hydraulic device. Hence, it is the pressure increase or pressure pulse which directly influence the pressure relief mechanism.
• the pressure relief mechanism in the hydraulic devices may also be actuated by a signal indicating the need of instant pressure relief.
• Still another possible way of actuating the pressure relief mechanism may be a mechanical arrangement which effects a force upon a desired part of the hydraulic system as consequence of large forces causing a change of the overall
• the hydraulic device may form part of a hydraulic system of a vehicle and may for example be used as hydraulic suspensions or an actuator for tilting or lifting desired parts of the vehicle.
• the hydraulic device may be located on a vehicle comprising a chassis and a cab supported on said chassis wherein said hydraulic device forms a first connection between said cab and said chassis.
• the vehicle may further comprise a second
• connection between said chassis and cab which is adapted to deform in the event of a collision in the direction from the front so as to allow the cab to move relatively said chassis in a direction towards the rear end of the chassis.
• These connections may be arranged such that said second connection is able to pivot and said first connection formed by said hydraulic device is adapted to raise and lower said cab relatively said chassis such that said first and second connections together form a tilting structure for the cab
• the hydraulic device described herein may for example be a part of the cab tilting arrangement described in WO 03 / 101 809, e.g. the use of the hydraulic device for the hydraulic tilting of a cab arranged on a chassis.
• the pressure relief arrangement may be connected to the crash detecting arrangement and using relevant data from the crash detecting arrangement to trigger an actuator of the pressure relief arrangement.
• said pressure relief arrangement in said hydraulic device could be arranged to be triggered by deformation of the second connection between the cab and the chassis.
• Fig. 1 Describes a hydraulic device suitable for the invention
• Fig. 2 Describes a hydraulic device comprising a pressure relief arrangement according to a first embodiment of the invention
• Fig. 3 Describes a hydraulic device comprising a
• Fig. 4 Describes a hydraulic device comprising a
• Fig. 5 Describes a hydraulic device according to the invention mounted on a vehicle
• a hydraulic device 1 suitable for the invention comprises a cylinder 2 and a piston 3 located in the cylinder 2.
• the piston 3 is arranged to be able to move back and forth in the cylinder 2.
• the piston 3 comprises a piston rod 4 and a piston disc 5 provided at the central end of the piston rod 4, i.e. the end of the piston rod 4 provided in the cylinder 2.
• the piston rod further comprises a distal end 14 provided outside the cylinder 2.
• the cylinder 2 comprises a central end 15 which is provided with a hole through which the piston rod 4 extends and a distal end 13 located at the opposite end of the cylinder.
• the piston disc 5 divides the cylinder 2 in the longitudinal extension in a first chamber 6 and a second chamber 7 whereof the first chamber 6 is defined by the piston disc 5, walls of the cylinder 2 and the distal end 13 of the cylinder 2 while the second chamber 7, through which the piston rod 4 extends, is defined by the piston disc 5, walls of the cylinder 2 and the central end 15 of the
• an increase of the volume in the first chamber 6, and an accordingly decrease of the volume of the second chamber 7, which is effectuated by moving the piston disc 5 attached to the piston rod towards the central end 15 of the cylinder 2, corresponds to an extension of the length of the part of the piston rod 4 outside the cylinder 2 and thus an extension of the overall length of the hydraulic device 1.
• a decrease of the volume in the first chamber 6, and an accordingly increase of the volume of the second chamber 7, which is effectuated by moving the piston disc 5 attached to the piston rod 4 towards the distal end 13 of the cylinder corresponds to a retraction of the length of the part of the piston rod 4 outside the cylinder 2 and thus a shortening of the overall length of the
• the control of the position of the piston rod 4 relatively the cylinder 2 is made by controlling a flow of hydraulic liquid by a pump 12 to a first inlet opening 8 in the first chamber 6 via a first, push pipe 9 and to a second inlet opening 10 in the second chamber 7 via a second, pull pipe 11.
• a pump 12 controls a flow of hydraulic liquid by a pump 12 to a first inlet opening 8 in the first chamber 6 via a first, push pipe 9 and to a second inlet opening 10 in the second chamber 7 via a second, pull pipe 11.
• FIG 2 is described an arrangement which will allow the hydraulic device 1 to extend or contract when the pressure release mechanism is actuated.
• the piston disc 5 used herein is in the form of a rupture disc. This disc is arranged to break or rupture in the case of an emergency such that there will be communication between the first and second chamber 6, 7. Even though the hydraulic liquid in the cylinder 2 may be still pressurized after the breakage or rupture of the disc 5, there will be no, or small, forces acting to keep the piston in its original location and the piston may move either way, i.e. the overall length of the
• FIG 3 is another pressure release mechanism shown in which a breakage of the second, pull pipe 11 is effectuated in case of the need for emergency pressure release.
• the pressure in the second chamber 7 will be lowered and the piston disc 5 will thus easily move in a direction towards the central end 15 of the cylinder 2 such that the piston rod 4 attached to the piston disc 5 will extend further through the cylinder 2 and the overall length of the hydraulic device will increase.
• the arrangement disclosed in figure 4 represents a third embodiment of the invention. In this embodiment has the second, pull pipe 11 been provided with
• pressure release pipe 16 extending between the pull pipe 11 and an oil reservoir in the pump 12.
• the pressure release pipe 16 is provided with a pressure relief valve 17 adapted to break when there is a need for a pressure relief in the pull pipe 11 and thus a pressure relief in the second chamber 7 and there will be essentially the same effect of this arrangement as described for the arrangement in figure 3.
• the pressure release arrangement may be provided at desired locations, i.e. connected so as to be able to influence the pressure in the the pull pipe 11 and/or in the push pipe 9.
• the above described pressure release arrangements may be actuated by being directly influenced by pressure or in response to a signal indicating the need of instant pressure relief whereby an actuator activates the pressure relief arrangement.
• a vehicle 101 comprising a hydraulic device 1 provided with a pressure release arrangement such as for example described in any of the embodiments described in association with figures 2 - 4.
• the vehicle exemplified in fig. 5 comprises a chassis 102 and a cab 103 supported on said chassis 102.
• the hydraulic device 1 forms a first connection 104 between the cab 103 and the chassis 102.
• the vehicle 101 further comprises a second connection 105 between said chassis 102 and cab 103.
• the second connection 105 is adapted to deform in the event of a collision in the direction from the front so as to allow the cab 103 to move relatively said chassis 102 in a direction towards the rear end of the chassis 102.
• the second connection 105 is further able to pivot.
• the first connection 104 formed by said hydraulic device 1 is adapted to raise and lower said cab 103 relatively said chassis 102 by controlling the flow of hydraulic liquid to and from the hydraulic device 1 such that said first and second connections 104, 105 together form a tilting structure for the cab 103 relatively said chassis 102.
• the vehicle also comprises a crash detecting arrangement comprising a control unit 106 and sensors 107 a, b.
• the signals from the sensors may be used as input to the control unit 106 which uses the information from the sensors 107 a, b for deciding if a triggering signal shall be sent to an actuator 108 for activation of the pressure relief arrangement of the hydraulic device 1.
• the control unit 106 may further inputs to the control unit 106 in order to trigger the activation of the pressure relief arrangement or it may be sufficient with only one sensor, e.g. to only use the deformation sensor 107 a for the activation of the pressure relief arrangement.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Fluid-Pressure Circuits (AREA)
• Actuator (AREA)
• Fluid-Damping Devices (AREA)

Applications Claiming Priority (1)

Publications (2)

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Family Applications (1)

Country Status (5)

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Citations (3)

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• 2010
  • 2010-12-14 BR BR112013014762A patent/BR112013014762A2/pt not_active IP Right Cessation
  • 2010-12-14 WO PCT/SE2010/000298 patent/WO2012082018A1/en active Application Filing
  • 2010-12-14 EP EP10860839.9A patent/EP2652338A4/de not_active Withdrawn
  • 2010-12-14 CN CN2010800707116A patent/CN103261708A/zh active Pending
  • 2010-12-14 RU RU2013132349/11A patent/RU2555588C2/ru not_active IP Right Cessation

Patent Citations (3)

Non-Patent Citations (1)

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