RU2247960C1 - Test stand for coaxial reduction gears - Google Patents

Abstract

FIELD: transport engineering.

SUBSTANCE: invention relates to design of test stands and it can be used for testing coaxial reduction gears in closed circuit. Proposed stand contains drive motor 3 and two coaxially installed reduction gears 1 and 2. Hollow output shafts 7 and 8 are interconnected by flexible coupling 9. Input shafts 4 and 5 arranged inside hollow shafts are connected by coupling 6. Housing of reduction gear 1 is installed stationarily on frame 10of stand, and housing of reduction gear 2 is installed in process support 11 secured on frame 1 for turning through preset angle relative to housing of reduction gear 1. Worm self-braking pair 12 is installed in support 11 to turn housing of reduction gear 2 through preset angle and fixing it in position. Worm wheel of pair can be made in form of sector secured by screws on housing of reduction gear 2. Any mechanical or hydraulic device installed on process support can be used instead of worm pair.

EFFECT: improved testing.

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Description

The invention relates to the field of transport engineering, and in particular to the design of test benches, and can be used to test gearboxes according to a closed loop circuit.

Famous stands operating on a closed loop circuit for testing shafts and gears include at least two process gearboxes for loop closure and are quite complex devices [1].

Closest to the claimed one is a test bench for planetary gearboxes with hollow central shafts according to a closed loop scheme, including two coaxially mounted planetary gearboxes and a loader that creates equal, oppositely directed torques on the planetary gearbox links connected to it [2]. This stand does not have technological reducers in its design, but to simplify the design, it is equipped with a torsion bar installed inside the hollow central shafts of the subjects through a loader.

The disadvantage of this stand is that it is "overloaded" with couplings due to the torsion shaft.

The basis of the invention is the technical task to provide accelerated endurance tests by creating any, limited only by the strength of the power elements of the transmission of loads while reducing drive power and simplifying the design of the stand.

This problem is solved by the fact that in the test bench for coaxial gearboxes according to a closed loop circuit including a drive motor and two coaxially mounted gearboxes, the output hollow shafts of which are connected to each other, according to the invention, the input shafts of the gearboxes are connected directly to each other by a clutch and are located inside the hollow output shafts that are interconnected by an elastic coupling, and the case of one of the gears is fixedly mounted on the frame of the stand, and the case of the second gearbox is installed in the technological pore fixed to the frame rotatable relative to the housing of the first gear by a predetermined angle and provided with a self-locking worm gear pair, worm wheel sector which is secured to the movable gear unit housing.

The difference of the inventive stand is that the loading of the gearboxes occurs provided that one of the gearboxes is mounted motionlessly on the frame, and the housing of the second gearbox is mounted on a technological support mounted on the frame and can be rotated relative to the first gearbox by a predetermined angle. This design eliminates the torsion shaft and reduces the number of couplings, as well as reduce the axial dimension of the stand. Due to this design, due to the rotation of the housing of one gearbox relative to the housing of the other gearbox, twisting of all the shafts and gears included in the kinematic chain of the closed circuit of the two gearboxes takes place. The stand allows you to adjust the magnitude of the twist, and therefore the magnitude of the loads arising in the power elements of the closed loop, which creates the conditions for accelerated bench tests. At the same time, the power consumption for the stand operation will be determined only by friction forces and, according to calculations, amounts to 2 ... 3% of the power that the gearbox can transmit under working loads.

The invention is illustrated by drawings, where figure 1 is a kinematic diagram of the stand; figure 2 - diagram of the rotation mechanism of one of the gears.

The test planetary gearboxes 1 and 2 are mounted on the stand coaxially. The drive motor 3 is connected to the input shaft 4 of one of the gearboxes. The input shafts 4 and 5 of the gearboxes are connected by a coupling 6 and are located inside the output hollow shafts 7 and 8, which are interconnected by an elastic coupling 9. This connection of the gearboxes forms a closed loop, shown in dashed lines in Fig. 1. The gearbox housing 1 is fixedly mounted on the stand frame 10, and the gearbox housing 2 is installed in the technological support 11, mounted on the frame 10 with the possibility of rotation relative to the housing of the first gearbox at a predetermined angle.

To rotate the gearbox housing 2 by a predetermined angle and fix it in this position inside the technological support 11, a self-braking worm pair 12 is mounted, the worm gear 13 (Fig. 2) of which can be made in the form of a sector 14, mounted on the gearbox body 2 with screws 15 Fundamentally, the worm pair can be replaced by any other mechanical or hydraulic device installed in the technological support.

Tests on the stand are as follows.

When the worm of the worm pair is rotated using the drive handle 16, the sector of the worm wheel 13 is rotated, which is rigidly connected to the gear housing 2, therefore, the housing also rotates together with the sector by an angle approximately equal to α = ± (15 ° ... 20 °). Since the gearbox 1 is stationary, the entire shaft drive system of gearboxes 1 and 2 in a closed circuit is loaded with elastic forces, which is facilitated by the elastic coupling 9. Fixing the gearbox 2 in a predetermined position is carried out due to friction forces, since the worm pair is self-braking.

The magnitude of the elastic moment in a closed loop is limited only by the strength of the elastic coupling 9 and the strength of other power elements of the closed loop.

The stand allows for accelerated endurance and wear tests of the shaft system, while consuming little power on the drive.

Industrial applicability.

The developed test bench for coaxial gearboxes can be used for accelerated endurance testing of gears, shafts and bearings of gearboxes of gearboxes of passenger cars and all types of power coaxial gearboxes, including planetary gearboxes, including some types of gearboxes of construction and road machines.

Sources of information taken into account.

1. A.S. 1422052 USSR, IPC G 01 M 13/02. Test bench for transmissions of transport vehicles.

2. A.S. 244672 USSR, IPC G 01 M 13/02. Test bench for planetary gearboxes. O.L. Skoblov. Publ. 05/28/1969. Bull. Number 18.

Claims (1)

Test bench for coaxial gearboxes according to a closed loop scheme, including a drive motor and two coaxially mounted gearboxes, the output hollow shafts of which are interconnected, characterized in that the input shafts of the gears are directly connected to each other by a clutch and are located inside the hollow output shafts that are connected between a flexible coupling, moreover, the case of one of the gearboxes is mounted motionlessly on the frame of the stand, and the case of the second gearbox is mounted in a technological support mounted on the frame with possibly rotation relative to the housing of the first gearbox at a given angle and equipped with a self-braking worm pair, the sector of the worm wheel of which is fixed to the housing of the movable gearbox.

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