Abstract: There is provided a method for detecting failure of a gas-hydraulic damper for a rail vehicle, comprising: - receiving a first input signal (S1) indicative of a stroke related parameter of the gas-hydraulic damper determined at a first time instance, - determining a first stroke value, based on the first input signal (S1), - receiving, at least one second input signal (Si), wherein each subsequent signal (Si) is indicative of a respective stroke related parameter measured at a respective subsequent time instance, - determining a respective stroke value based on each of the second input signals (Si), - determining a stroke value over time based on the determined stroke values, and - determining that there is a failure of the gas-hydraulic damper if the stroke value over time, fulfils a first criterion. Also provided are a system, a gas-hydraulic damper and computer program product.

Abstract: The present invention relates to a damper for a rail vehicle, the damper comprising —a cylindrical housing (1) wherein a hollow piston (2) is received axially movable, —a working chamber (5) of variable volume in the housing, —a overflow chamber (4) of variable volume in the piston, the hydraulic overflow chamber (5) being connected to the hydraulic working chamber (5) via a throttle (8) that is in a flow passage between the working chamber (5) and the overflow chamber (4), —a spring chamber (3) of variable volume in the piston, the spring chamber (3) being configured to hold a gas volume for acting as a spring, and the spring chamber being separated from the hydraulic overflow chamber (4) by a separator piston (6) that is axially movable, and the damper further comprising a pressure detector (7) that is configured to detect a pressure in at least one of the spring chamber (3), the working chamber (5) and the overflow chamber (4).

Abstract: An energy absorption device absorbs energy that is released upon impact between two objects in relative motion. An exceptional load applied to any of the two objects results in acceleration of one object relative to the other object. The acceleration energy is absorbed by deformation of an element or elements that are put under stress from the objects upon impact. The process of deformation includes a controlled diameter reduction during a forced elongation of a semi-solid or solid deformation bolt made from a cold-formed material in the direction of force generated from the acceleration.

Abstract: A damper for a train coupler is shown, comprising a hydraulic balancing chamber (115) defined in an annular space between a piston (101) and a housing (102) in which the piston is movably received, wherein the balancing chamber is in flow communication with a hydraulic high-pressure chamber (103) via inlet and outlet bores (116; 130) formed through a slip-ring (117) that journals the piston in the housing. A portion (129) of the piston is shielded in a buffer chamber (128) formed in the annular space between the piston and the housing, in axial alignment with the balancing chamber.

Abstract: A damper for a train coupler is shown, comprising a hydraulic balancing chamber (115) defined in an annular space between a piston (101) and a housing (102) in which the piston is movably received, wherein the balancing chamber is in flow communication with a hydraulic high-pressure chamber (103) via inlet and outlet bores (116; 130) formed through a slip-ring (117) that journals the piston in the housing. A portion (129) of the piston is shielded in a buffer chamber (128) formed in the annular space between the piston and the housing, in axial alignment with the balancing chamber.

Abstract: An energy absorption device (3) and method is disclosed for absorption of energy that is released upon impact between two objects in relative motion, wherein an exceptional load applied to any of the two objects results in acceleration of said object relative to the other object, and wherein for retardation of said acceleration energy is absorbed in the process of deformation of an element or elements which are put under stress from the objects upon impact. The process of deformation comprises a controlled diameter reduction during a forced elongation of a semi-solid or solid deformation bolt (4) made of cold-forming material in the direction of force (FX) generated in said acceleration.

Abstract: A valve for controlling a liquid in an hydraulic vehicle shock absorber includes a displacement machine mounted within a passageway in a piston moveable in a cylinder of the shock absorber. The displacement machine includes at least one operative body rotatable by flow of the liquid. A brake is provided for braking the movement of the rotatable body of the displacement machine thereby causes a reduction in the flow velocity of the liquid passing through the valve and a desired damping force. The brake is actuated by an actuating unit.

Abstract: A restriction valve device for hydraulic pressure fluid in a vehicle shock absorbing mechanism comprises a valve seat member with at least one main opening for the passage of said pressure fluid, said main opening being closable by means of a movable spring-biased valve body, and at least one auxiliary opening for the pressure fluid, said auxiliary opening being selectively closable by a closure element. To provide for a fast and reliable change or control of the functional characteristics of the damper, yet making same inexpensive and uncomplicated, a closed variable space is confined between the valve seat member and the valve body, the auxiliary opening being connected with said space so as to admit when the closure element is open, the pressure fluid thereinto and thus apply also the pressure of said fluid onto said valve body to effect an increased pressure force on said body against the force of the biasing spring so as to change the functional characteristics of the restriction valve device.