Vibration damping device for railway vehicle

Patent metadata

Field	Value
Publication number	US-9328789-B2
Application number	US-201214115768-A
Country	US
Kind code	B2
Filing date	Aug 6, 2012
Priority date	Aug 11, 2011
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

A vibration damping device for railway vehicle includes an actuator and a damper circuit that causes the actuator to function as a damper. The actuator includes a cylinder coupled to a truck of a railway vehicle, a piston, a rod coupled to the piston and a body, a rod-side chamber and a piston-side chamber inside the cylinder, a first on-off valve for a first passage that communicates between a rod-side chamber and a piston-side chamber, a second on-off valve for a second passage that communicates between the piston-side chamber and a tank, and a pump that supplies a hydraulic fluid into the rod-side chamber. The hydraulic fluid has such kinematic viscosity-temperature characteristics that a kinematic viscosity of the hydraulic fluid ranges from 7 mm 2 /s to 50 mm 2 /s in a temperature range of from 20° C. to 60° C.

First claim

The invention claimed is:

1. A vibration damping device for railway vehicle suppressing vibration of a body of a railway vehicle, the vibration damping device for railway vehicle comprising:
an actuator including:
a cylinder coupled to one of a truck and the body of the railway vehicle; a piston slidably inserted into the cylinder;
a rod inserted into the cylinder and coupled to the piston and another one of the truck and the body;
a rod-side chamber and a piston-side chamber partitioned by the piston inside the cylinder;
a tank;
a first on-off valve provided in a middle of a first passage that communicates between the rod-side chamber and the piston-side chamber;
a second on-off valve provided in a middle of a second passage that communicates between the piston-side chamber and the tank; and
a pump capable of supplying a hydraulic fluid into the rod-side chamber;

a damper circuit adapted to cause the actuator to function as a damper under a state in which the first on-off valve and the second on-off valve are closed; and
a controller adapted to control the actuator so as to suppress vibration of the body of the railway vehicle by obtaining, based on a lateral acceleration in a horizontal direction with respect to an advancing direction of the railway vehicle, a control force command value to perform feedback control to cause the actuator to generate a thrust,
wherein the hydraulic fluid has such kinematic viscosity-temperature characteristics that a kinematic viscosity of the hydraulic fluid is in a range of 7 mm 2 /s to 50 mm 2 /s over an entire temperature range of 20° C. to 60° C., and
the controller causes the pump to be rotated and driven at a predetermined normal rotational speed, and when the kinematic viscosity of the hydraulic fluid in the actuator exceeds 50 mm 2 /s, the controller causes the pump to be rotated and driven at a rotational speed lower than the normal rotational speed.

2. The vibration damping device for railway vehicle according to claim 1 , further comprising a rotational speed determining section adapted to determine the rotational speed for the pump, wherein
the rotational speed determining section estimates a temperature of the hydraulic fluid in the actuator, and compares the estimated temperature to a reference temperature satisfying a condition that the kinematic viscosity of the hydraulic fluid is 50 mm 2 /s, to thereby determine the rotational speed for the pump.

3. The vibration damping device for railway vehicle according to claim 2 , wherein
the rotational speed determining section estimates the temperature of the hydraulic fluid in the actuator based on at least one of date information, a traveling position of the railway vehicle, air temperature information of a traveling region of the railway vehicle, time information, and an operation time period of the actuator.

4. The vibration damping device for railway vehicle according to claim 1 , wherein
the hydraulic fluid is a mineral oil.

5. The vibration damping device for railway vehicle according to claim 1 , wherein
the actuator further includes a discharge passage that connects the rod-side chamber to the tank, and a variable relief valve that is provided in a middle of the discharge passage and is capable of varying a valve opening pressure.

6. The vibration damping device for railway vehicle according to claim 1 , wherein
the damper circuit includes suction passage that permits only a flow of a fluid from the tank into the piston-side chamber, and a flow straightening passage that permits only a flow of the fluid from the piston-side chamber into the rod-side chamber.

7. A vibration damping device for railway vehicle suppressing vibration of a body of a railway vehicle, the vibration damping device for railway vehicle comprising:
an actuator including:
a cylinder coupled to one of a truck and the body of the railway vehicle; a piston slidably inserted into the cylinder;
a rod inserted into the cylinder and coupled to the piston and another one of the truck and the body;
a rod-side chamber and a piston-side chamber partitioned by the piston inside the cylinder;
a tank;
a first on-off valve provided in a middle of a first passage that communicates between the rod-side chamber and the piston-side chamber;
a second on-off valve provided in a middle of a second passage that communicates between the piston-side chamber and the tank; and
a pump capable of supplying a hydraulic fluid into the rod-side chamber;

a damper circuit adapted to cause the actuator to function as a damper under a state in which the first on-off valve and the second on-off valve are closed; and
a controller adapted to control the actuator so as to suppress vibration of the body of the railway vehicle by obtaining, based on a lateral acceleration in a horizontal direction with respect to an advancing direction of the railway vehicle, a control force command value to perform feedback control to cause the actuator to generate a thrust, wherein
the hydraulic fluid has such kinematic viscosity-temperature characteristics that a kinematic viscosity of the hydraulic fluid is in a range of 7 mm 2 /s to 50 mm 2 /s over an entire temperature range of 20° C. to 60° C. so as to prevent hunting of the thrust over an entire temperature range of −20° C. to 60° C., and
the controller causes the pump to be rotated and driven at a predetermined normal rotational speed, and when the kinematic viscosity of the hydraulic fluid in the actuator exceeds 50 mm 2 /s, the controller causes the pump to be rotated and driven at a rotational speed lower than the normal rotational speed.

8. A vibration damping device for railway vehicle suppressing vibration of a body of a railway vehicle, the vibration damping device for railway vehicle comprising:
an actuator including:
a cylinder coupled to one of a truck and the body of the railway vehicle; a piston slidably inserted into the cylinder;
a rod inserted into the cylinder and coupled to the piston and another one of the truck and the body;
a rod-side chamber and a piston-side chamber partitioned by the piston inside the cylinder;
a tank;
a first on-off valve provided in a middle of a first passage that communicates between the rod-side chamber and the piston-side chamber;
a second on-off valve provided in a middle of a second passage that communicates between the piston-side chamber and the tank; and
a pump capable of supplying a hydraulic fluid into the rod-side chamber;

a damper circuit adapted to cause the actuator to function as a damper under a state in which the first on-off valve and the second on-off valve are closed; and
a controller adapted to control the actuator so as to suppress vibration of the body of the railway vehicle by obtaining, based on a lateral acceleration in a horizontal direction with respect to an advancing direction of the railway vehicle, a control force command value to perform feedback control to cause the actuator to generate a thrust, wherein
the hydraulic fluid has such kinematic viscosity-temperature characteristics that a kinematic viscosity of the hydraulic fluid is in a range of 7 mm 2 /s to 50 mm 2 /s over an entire temperature range of 20° C. to 60° C., and is out of the range of 7 mm 2 /s to 50 mm 2 /s in at least a part of a temperature range of −20° C. to 20° C., and
the controller causes the pump to be rotated and driven at a predetermined normal rotational speed, and when the kinematic viscosity of the hydraulic fluid in the actuator exceeds 50 mm 2 /s, the controller causes the pump to be rotated and driven at a rotational speed lower than the normal rotational speed.

Assignees

• Ogawa Takayuki
• Aoki Jun
• Suzuki Tsutomu
• Uchida Masaru
• Yabuki Chie
• Kyb Corp

Inventors

• Ogawa Takayuki
• Aoki Jun
• Suzuki Tsutomu
• Uchida Masaru
• Yabuki Chie

Classifications

• F16F9/18 Primary

  with a closed cylinder and a piston separating two or more working spaces therein · CPC title

• F16F9/19

  with a single cylinder {and of single-tube type} · CPC title

• B61F5/24 Primary

  Means for damping or minimising the canting, skewing, pitching, or plunging movements of the underframes · CPC title

• F15B11/028

  for controlling the actuating force (F15B11/024 takes precedence) · CPC title

• F16F9/46

  allowing control from a distance {, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall (attachment of valve units to cylinders F16F9/325)} · CPC title