SU1250877A1 - Bench with closed power circuit for testing vehicle transmissions - Google Patents

Abstract

The invention can be used for life tests of tracked vehicle transmissions. The purpose of the invention is to improve the accuracy of reproduction of the operating modes of loading the transmission when the direction of the vehicle changes. The bench contains a technological transmission 1, identical in kinematic parameters of the tested transmission 2. The input shafts 3 and 4 are kinematically connected to each other by means of cardan gear 5. The output wajas 8–11 of both sides of the test and technological transmissions are kinematically interconnected to form a closed power circuit by means of two four-link articulated parallelogram mechanisms. The stand contains a bootloader included in a closed power circuit. Cranks 12 and 13 are shifted in f ase by 90 relative to cranks 14 and 15, 2 Il. (L с: ю э about 00 | FIG.

Description

The invention relates to a transport engineering and can be used for life-long tests of tracked vehicles.

The purpose of the invention is to show the accuracy of reproducing the operating modes of loading the transmission when the direction of the vehicle changes.

Fig. 1 shows the kinematic scheme of the proposed stand; Fig. 2 shows a kinematic diagram of four axle articulated parallelogram mechanisms.

The bench contains a technological transmission 1, identical in kinematic parameters of the ejected transmission 2, the input shafts 3 and which, by means of Cardan transmission 5, are kinematically connected to each other, a drive motor 6 connected to the power transmission shaft 7 of the technological transmission 1 and kinematically connected with shafts 3 and 4. The output shafts 8-11 of both sides of the test 2 and technological transmission are kinematically connected to each other to form a closed power circuit through two four-star joints paraplelogramme mechanisms, consisting of cranks 12-15, installed respectively on the output shafts

U

8-11, and connecting rods 16 and 17, cranks 12 and 13 are out of phase 90 relative to cranks 14 and 15. The stand also includes a loader included in a closed power circuit and having levers 18 and 19 associated with salt gears a planetary rotation mechanism of the process transmission 1, and push levers 20 and 21 connected to the levers 18 and 19 by means of springs 22 and 23. The ends of the levers 20 and 21 are connected with displacement drives, for example power cylinders (not shown)

The loader may also be in the form of two flanges, having centrally arranged through holes, mounted on the split cardan shaft of the cardan gear 5, rotated relative to each other and connected in a loaded state by means of a bolt joint.

The stand works as follows.

By means of push levers 20 and 21 in units of the tested trans

MISSIONS 2 and in the stand nodes create loads of a given average level. When the drive engine 6 is turned on, the units of the tested transmission 2 and the stand assembly are rotated. On the output shafts 8-11, the variable component of the torque is equal to.

M gR-sin,

where g is the radius of the crank;

P - axial force in the connecting rod; d is the angle of rotation of the crank. When the cranks 12 and 13 are rotated by an angle and the variable, the torque component is zero. Since cranks 14 and 15 are out of phase by 90 relative to cranks 12 and 13, cranks 14 and 15 at this moment turn through an angle d -J0 ° and. In this position, the variable component of the torque is equal to the maximum value determined from the expression

When the output shafts 8 and 9 are rotated one turn, the torque component on these shafts is variable twice at and takes the maximum value. In the same ideas, the torque component at the same time on the output shafts 10 and 11 of the other side takes on a maximum value. When the output shafts 10 and 11 are rotated by an angle d 0 ° and the torque component on these shafts is variable, it takes on a maximum value, and at the same time, the torque component on the output shafts 8 and 9 takes on a minimum value.

Claims (1)

Invention Formula Stand with closed power circuit for testing the transmission of vehicles containing technological transmission c. an input shaft that has a kinematic connection with the input shaft of the transmis- sion 1 under test, and a drive motor and a loader included in a closed power circuit, characterized in that, in order to improve the accuracy of reproducing the operating modes of loading the transmission means, it is equipped with two four-link articulated parallelogram mechanisms, blood tips of which are installed on the output shafts of both sides in the technological transmission and are designed to be installed on the output shafts of both sides of the tested transmission, while cranks installed on the output shafts of one side of the technological transmission and intended for the output of one side of the tested transmission, are out of phase by 90 ° relative to the cranks mounted on the output shafts of the other mouth technological transmission, and cranks with the ability to install on the output shafts of the other side of the test transmission. 90 - 77 -.7 (rig. g Editor S. Lisin Compiled by N. Mazepov Tehred V.Kadar Proofreader V.But ha Order 4400/36 Circulation 778 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4