Abstract: An electric actuator includes an electric motor, a drive device that drives the electric motor to output a first rotary motion using power accumulated in a capacitor, and a motion converter that is coupled to the electric motor and converts the first rotary motion into a second rotary motion. The first rotary motion is forward and reverse rotary motions that are output by the electric motor as the drive device drives the electric motor to repeat forward rotation and reverse rotation. The second rotary motion is a unidirectional rotary motion. Regenerative electric power generated in the electric motor by the electric motor repeating the forward rotation and the reverse rotation is supplied to the capacitor.

Abstract: A test device includes an input side drive part that drives a steering shaft of a steering device, a control part that controls the input side drive part, and a position detecting part that detects an angular position of the steering shaft. The control part restricts a maximum value of a torque of the steering shaft when the angular position reaches an end-abutment position. The control part also controls driving of the steering shaft by a position control in which the angular position is used as a controlled variable and a torque control in which the torque is used as a controlled variable. The control part performs the position control when the angular position is outside a first angular range including the end-abutment position and switches the driving of the steering shaft from the position control to the torque control when the angular position reaches within the first angular range.

Abstract: A tire testing device includes a carriage configured to rotatably hold a test wheel provided with a test tire and being capable of travelling on a base along a road surface in a state where the test wheel is made to contact the road surface, and a driving system configured to drive the test wheel and the carriage. The driving system includes a carriage driving part configured to drive the carriage with respect to the road surface in a predetermined speed, a test wheel driving part configured to drive the test wheel in a rotating speed corresponding to the predetermined speed, a driving part configured to generate power to be used to drive the carriage and the test wheel, and a power distributing part configured to distribute power generated by the driving part to the carriage driving part and the test wheel driving part.

Abstract: A tire testing method includes measuring a ?-S characteristic of a test tire using a first tire testing device causing the tire to travel along a road surface where the tire is made to contact the road surface, measuring the ?-S characteristic of the tire using a second tire testing device that causes the tire to rotate where the tire contacts a road surface provided on an outer periphery of a rotating drum, comparing the ?-S characteristic measured by the first testing device with the ?-S characteristic measured by the second testing device and obtaining a relationship between the two ?-S characteristics, converting the p-S characteristic measured by the second testing device to the p-S characteristic by the first testing device based on the relationship between the two ?-S characteristics, and synthesizing the ?-S characteristic measured in the first measurement step and the ?-S characteristic obtained by the conversion.

Abstract: A wheel testing system adapted for testing a wheel of a railroad vehicle includes a first testing device including a rail on which a test wheel rolls, a second testing device including a rail wheel that rotates together with the test wheel while being in contact with the test wheel, and a test data processing device that processes pieces of test data of ?-S characteristics obtained by the first testing device and the second testing device. The test data processing device converts a test result by the second testing device into a test result by the first testing device based on the test result by the first testing device and the test result by the second testing device.

Abstract: A collision simulation test apparatus including a table to which a test piece is to be attached, the table being movable in a predetermined direction, a toothed belt for transmitting power to drive the table, a drive module capable of driving the toothed belt, and a control part capable of controlling the drive module. The control part is capable of controlling the drive module to generate an impact to be applied to the test piece, and the impact generated by the drive module is transmitted to the table by the toothed belt.

Abstract: A tire testing device includes a carriage configured to rotatably hold a test wheel provided with a test tire and being capable of travelling on a base along a road surface in a state where the test wheel is made to contact the road surface, and a driving system configured to drive the test wheel and the carriage. The driving system includes a carriage driving part configured to drive the carriage with respect to the road surface in a predetermined speed, a test wheel driving part configured to drive the test wheel in a rotating speed corresponding to the predetermined speed, a driving part configured to generate power to be used to drive the carriage and the test wheel, and a power distributing part configured to distribute power generated by the driving part to the carriage driving part and the test wheel driving part.

Abstract: A linear actuator comprises a base, a fixed part support mechanism attached to the base, a fixed part elastically supported by the fixed part support mechanism, and a movable part driven to reciprocate in a predetermined drive direction with respect to the fixed part. The fixed part support mechanism comprises a linear guide that couples the fixed part to the base to be slidable in the predetermined drive direction, and an elastic member that couples the fixed part to the base to be elastically movable in the predetermined drive direction. The linear guide includes a rail attached to the fixed part, and a runner block attached to the base, the runner block being engaged with the rail slidably in the drive direction.

Abstract: An oscillating device including a vibrating table, an actuator configured to oscillate the vibrating table in a first direction, a coupling mechanism configured to couple the vibrating table with the actuator in such a manner that the vibrating table is movable relative to the actuator in a second direction orthogonal to the first direction, and a counter balancer attached to the vibrating table and configured to compensate an imbalance of an oscillated portion including at least the vibrating table, the imbalance being caused by attaching the coupling mechanism to the vibrating table.

Abstract: A collision simulation test apparatus including a table to which a test piece is to be attached, the table being movable in a predetermined direction, a toothed belt for transmitting power to drive the table, a drive module capable of driving the toothed belt, and a control part capable of controlling the drive module. The control part is capable of controlling the drive module to generate an impact to be applied to the test piece, and the impact generated by the drive module is transmitted to the table by the toothed belt.

Abstract: A tire testing device includes a carriage configured to rotatably hold a test wheel provided with a test tire and being capable of travelling on a base along a road surface in a state where the test wheel is made to contact the road surface, and a driving system configured to drive the test wheel and the carriage. The driving system includes a carriage driving part configured to drive the carriage with respect to the road surface in a predetermined speed, a test wheel driving part configured to drive the test wheel in a rotating speed corresponding to the predetermined speed, a driving part configured to generate power to be used to drive the carriage and the test wheel, and a power distributing part configured to distribute power generated by the driving part to the carriage driving part and the test wheel driving part.

Abstract: An electric linear actuator includes an outer cylinder, an electric motor attached to the outer cylinder, a ball screw configured to convert rotational motion output by the electric motor into linear motion in a predetermined direction, and a ball spline configured to transmit only the linear motion in the predetermined direction, The ball screw includes a screw shaft coupled to a shaft of the electric motor, and a first nut fitted to the screw shaft. The ball spline includes a spline shaft connected to the first nut, and a second nut attached to the outer cylinder and fitted to the spline shaft.

Abstract: A linear actuator, comprising: a base; a fixed part support mechanism attached to the base; a fixed part elastically supported by the fixed part support mechanism; and a movable part driven to reciprocate in a predetermined drive direction with respect to the fixed part, wherein the fixed part support mechanism comprises: a movable block attached to the fixed part; a linear guide that couples the movable block with the base to be slidable in the predetermined drive direction; and an elastic member that is disposed between the base and the movable block and prevents transmission of a high frequency component of vibration in the predetermined drive direction.

Abstract: A tire testing device includes a road surface, and a carriage configured to rotatably hold a test wheel and traveling along the road surface. The carriage includes an alignment part configured to adjust wheel alignment of the test wheel. The alignment part includes a load adjusting part configured to adjust load acting on the test wheel. The load adjusting part includes a first movable frame movable up and down, a linear guide that guides the movement of the first movable frame, and a first driver that drives the first movable frame up and down. One of a rail and a traveling part of the linear guide is fixed to the first movable frame. The carriage includes a main frame having an alignment mechanism support part that accommodates the alignment part. The other of the rail and the traveling part is fixed to the alignment mechanism support part.

Abstract: A collision simulation test apparatus including a table to which a test piece is to be attached, the table being movable in a predetermined direction, a toothed belt for transmitting power to drive the table, a drive module capable of driving the toothed belt, and a control part capable of controlling the drive module. The control part is capable of controlling the drive module to generate an impact to be applied to the test piece, and the impact generated by the drive module is transmitted to the table by the toothed belt.

Abstract: A dynamic balance testing device includes a vibrating unit configured to rotatably hold a predetermined rotating body being a specimen, a first spring configured to elastically support the vibrating unit and restrict displacement of the vibrating unit in a direction parallel to a rotation axis of the predetermined rotating body, and at least three second springs configured to elastically support the vibrating unit and restrict displacement of the vibrating unit in a predetermined direction orthogonal to the rotation axis. The at least three second springs are attached to the vibrating unit on a same predetermined plane, and the vibrating unit holds the predetermined rotating body such that a projection of a center of gravity of the predetermined rotating body onto the predetermined plane is substantially at the same position as a position where the first spring is attached to the vibrating unit.

Abstract: A collision simulation test apparatus including a table to which a test piece is to be attached, the table being movable in a predetermined direction, a toothed belt for transmitting power to drive the table, a drive module capable of driving the toothed belt, and a control part capable of controlling the drive module. The control part is capable of controlling the drive module to generate an impact to be applied to the test piece, and the impact generated by the drive module is transmitted to the table by the toothed belt.

Abstract: A wheel test device includes a rail wheel support rotatably supporting a rail wheel, a wheel support rotatably supporting a test wheel in contact with the rail wheel, a first electric motor, a power distributor distributing power generated by the first electric motor to the rail wheel and the test wheel, and a torque generator generating torque to be applied to the test wheel. The torque generator includes a rotating frame rotationally driven by the first electric motor, and a second electric motor mounted on the rotating frame. One of or both the rail wheel and the test wheel is connected to the first electric motor via the torque generator. A rated output of the second electric motor is equal to or more than 3 kW, and moment of inertia of a rotating part of the second electric motor is equal to or less than 0.01 kg·m2.

Abstract: A dynamic balance testing device includes a vibrating unit configured to rotatably hold a predetermined rotating body being a specimen, a first spring configured to elastically support the vibrating unit and restrict displacement of the vibrating unit in a direction parallel to a rotation axis of the predetermined rotating body, and at least three second springs configured to elastically support the vibrating unit and restrict displacement of the vibrating unit in a predetermined direction orthogonal to the rotation axis. The at least three second springs are attached to the vibrating unit on a same predetermined plane, and the vibrating unit holds the predetermined rotating body such that a projection of a center of gravity of the predetermined rotating body onto the predetermined plane is substantially at the same position as a position where the first spring is attached to the vibrating unit.

Abstract: An impact test device includes a base, a dolly capable of traveling with a test piece placed thereon, and a fall preventing structure configured to prevent the test piece from falling over. The fall preventing structure includes a first section independent of the dolly The first section is provided so as to be movable in a traveling direction of the dolly with respect to the base.