SU315079A1 - TESTS OF BOX SPEED SYNCHRONIZERS - Google Patents

Description

The invention relates to the field of automotive industry, in particular to installations for testing automobile components. There are known stands for testing gear box synchronizers, containing a test box drive motor, a flywheel mounted on the input shaft of the box, and a shift lever drive mechanism. However, on such stands, the conditions for loading the synchronizers are not sufficiently stable due to the imperfection of the mechanism for the drive of the shift lever drive. The proposed stand differs from the known ones in that the mechanism for driving the shift lever is formed in the form of a rocker arm with weights, connected with cables to the shift lever and interacting with the cam driven from the electric motor, and the flywheel is equipped with an electromechanical brake controlled by a microswitch interacting with the cam drive . When taco, the stand is stabilized, the conditions for loading the chiffon conditioners are stabilized. The drawing schematically shows the described stand. The stand is a base, which is equipped with an electric motor 1, a gearbox 2 of the gearbox drive, a gearbox 3, on the shaft of the wheel of which cams 4, 5 and the gearbox drive motor 6 are mounted. On the base there is also a rack 7 mounted on it. 8. Weights are secured to the rocker arm 9. A cable 10 connects the arms of the rocker arm to the gear shift lever 11. A flywheel 13 is mounted on the input shaft of the test gearbox 12, which is fitted with an electromechanical brake. The brake is automatically controlled when a microswitch 14 interacts through a pusher with a cam 5. Before testing, a node consisting of gearbox 3, electric motor 6 and microswitch 14 is installed under one arm of the rocker arm. Depending on the gear, the arm arm will be selected included in the process of testing the synchronizer. After starting the electric motors of the stand, they press the pedal 15 and release the rocker. When the roller 16 is sliding off the cam 4, the transmission starts. During synchronization, the arm 8, rigidly connected to the shift lever, remains stationary. Cam 4 moves away from the roller 16, n cargo 9 freely act on the lever 11 during the entire synchronization process. In doing so, the flywheel 13 accelerates to revolutions at which the gear is engaged. Some time after switching on the transmission, the cam 4, interacting with the roller 16, returns the beam to the initial position, and the transmission is turned off. Then the cam 5 pushes against the pushbutton of the microswitch 14, the electromechanical brake is activated, and the flywheel 13 stops. The flywheel is de-energized by starting the transmission.

On the bench, in addition to testing the synchronizers for wear, you can determine the synchronization time depending on the switching effort, the degree of heating of the synchronizer parts depending on the specified operating mode, the effect of lubrication conditions on the synchronization efficiency, the relationship between synchronization time, speed and inertial mass value and you can also determine the moment of friction of the blocking ring in

depending on effort, speed, lubrication, degree of heating, etc.

Subject invention

A test bench for gearbox synchronizers, containing a test gear drive electric motor, a flywheel on the input shaft of the gearbox and a gearshift drive mechanism, which means that, in order to stabilize the loading conditions of the synchronizers, the gearshift drive gear mechanism is in the form of a rocker arm with weights connected cables with a shift lever and interacting with a cam driven by an electric motor, and the flywheel is equipped with an electromechanical brake controlled by microswitch, interacting with the drive rocker cam.