A first and/or a second electrical machine is tested using a test apparatus that includes a torque transmitter having torque connections for the first and the second electrical machine and an electrical shaft having respective electrical connections for the first and the second electrical machine. The electrical shaft is designed to transmit at least five times as much electrical power between the respective electrical connections as can be supplied by a supply apparatus of the test apparatus from an external electrical energy source to the electrical shaft. This condition is assumed to be satisfied when the test apparatus lacks such a supply apparatus. A corresponding method using such test apparatus is also disclosed.

An end-connecting type hydraulic loader to solve the difficult loading and assembly on the same side in closed power closed testing in planetary gearbox, includes a transmission shaft (3), an internal output inner gear sleeve (1) on a left end of the transmission shaft (3), a thrust shaft (5) rotatably mounted on the transmission shaft (3) and positioned on a right side of internal output inner gear sleeve (1), an external output inner gear sleeve (2) coaxially installed on the internal output inner gear sleeve (1) and connected to the thrust shaft (5), a spiral floating cylinder (9) on a right end of the thrust shaft (5) and a siding assembly on the transmission shaft (3) meshed with the spiral floating cylinder (9) having a left and right sliding movement along the transmission shaft (3) under a hydraulic oil circuit action of the transmission shaft.

An end-connecting type hydraulic loader to solve the difficult loading and assembly on the same side in closed power closed testing in planetary gearbox, includes a transmission shaft (3), an internal output inner gear sleeve (1) on a left end of the transmission shaft (3), a thrust shaft (5) rotatably mounted on the transmission shaft (3) and positioned on a right side of internal output inner gear sleeve (1), an external output inner gear sleeve (2) coaxially installed on the internal output inner gear sleeve (1) and connected to the thrust shaft (5), a spiral floating cylinder (9) on a right end of the thrust shaft (5) and a siding assembly on the transmission shaft (3) meshed with the spiral floating cylinder (9) having a left and right sliding movement along the transmission shaft (3) under a hydraulic oil circuit action of the transmission shaft.

A planetary gear carrier pack transmission error inspection device is provided. The device includes a planetary gear carrier pack that outputs a rotation speed input to an input side through a planetary gear, a sun gear and a ring gear at a predetermined gear ratio to an output side. An input unit is arranged on an upper side of the planetary gear carrier pack to input a predetermined input rotation speed to the input side of the planetary gear carrier pack. A load unit is arranged on a lower side of the planetary gear carrier pack connected to the output side of the planetary gear carrier pack to apply a predetermined output load to the output side. In addition, an adjusting block is arranged to adjust the planetary gear carrier pack to secure the planetary gear carrier pack.

An experimental system and a method for simulating a gear transmission of an electric multiple unit under wheel-rail excitation are provided. The experimental system includes a gear transmission experimental table and an excitation device. Under the action of the excitation device, the electric multiple unit gear transmission experimental table carries out no-load and load experiments of a gear transmission system to simulate the dynamic characteristic change of the gear transmission system under the wheel-rail excitation environment. The basic experiments of the gear transmission system of the electric multiple unit can be carried out, the wheel-rail excitation received by the gear transmission system during operation of the electric multiple unit can also be simulated, thus making up the vacancy of the experimental researches in the field of electric multiple unit transmission considering the environmental conditions of wheel-rail excitation in China.

An experimental system and a method for simulating a gear transmission of an electric multiple unit under wheel-rail excitation are provided. The experimental system includes a gear transmission experimental table and an excitation device. Under the action of the excitation device, the electric multiple unit gear transmission experimental table carries out no-load and load experiments of a gear transmission system to simulate the dynamic characteristic change of the gear transmission system under the wheel-rail excitation environment. The basic experiments of the gear transmission system of the electric multiple unit can be carried out, the wheel-rail excitation received by the gear transmission system during operation of the electric multiple unit can also be simulated, thus making up the vacancy of the experimental researches in the field of electric multiple unit transmission considering the environmental conditions of wheel-rail excitation in China.

A test fixture for accelerated testing of different loads includes a fixture shaft adapted to be detachably connected to a test shaft. A pulley is fixedly supported by the fixture shaft. A cable has a first end fixedly attached to the pulley and a second end detachably attached to a test mass.

A test fixture for accelerated testing of different loads includes a fixture shaft adapted to be detachably connected to a test shaft. A pulley is fixedly supported by the fixture shaft. A cable has a first end fixedly attached to the pulley and a second end detachably attached to a test mass.

A test bench for testing a planetary transmission is provided. In order to utilize the test bench for a planetary transmission without a planetary carrier bearing, the test bench has a central bearing unit. The central bearing unit is configured to rotatably mount a planetary carrier of a first stage of the planetary transmission, and the central bearing unit is configured, furthermore, to center an internal gear of the planetary transmission with respect to the planetary carrier.

A test bench for testing a planetary transmission is provided. In order to utilize the test bench for a planetary transmission without a planetary carrier bearing, the test bench has a central bearing unit. The central bearing unit is configured to rotatably mount a planetary carrier of a first stage of the planetary transmission, and the central bearing unit is configured, furthermore, to center an internal gear of the planetary transmission with respect to the planetary carrier.