RU207924U1 - TWO-STAGE TRACTION GEARBOX - Google Patents

Abstract

The utility model relates to transport engineering, namely to rail vehicles, and can be used in devices for transmitting torque from a traction motor to a wheel pair. A two-stage traction drive gearbox is proposed, which consists of a housing with an input gear shaft located inside, connected by a gear transmission with a wheel mounted on an intermediate gear shaft connected by a gear train with a wheel mounted on the output shaft. The shafts are installed in bearing supports. The bearing arrangements of the input pinion shaft and the intermediate pinion shaft consist of a roller bearing and a four-point contact angular contact ball bearing. and increasing the resource of work.

Description

The utility model relates to transport engineering, namely to rail vehicles, and can be used in devices for transmitting torque from a traction motor to a wheelset.

Known traction drives of motor carts (patents SU1492121 (F16H 3/00, B60K 17/08, B61C 9/50, publ. 07.07.1989), SU1745586 (B61C 9/48, publ. 07.07.1992), RU130277 (B61F 3 / 00, В61F 3/04, В61F 5/02, publ. 20.07.2013), RU2674400 (В61F 3/02, В61Н 5/00, В61С 9/00, publ. 07.12.2018), in which for the transmission of torque from The engine uses two-stage gearboxes for the wheelset The design of the bearing arrangements is not specified in these patents.

Known is a single-stage support-axial traction gearbox, configured to be attached to the bogie frame, consisting of a rigid body divided into fastened upper and lower body parts, inside which, in the upper part, there is a pinion shaft with a shank protruding outward, connected by means of gearing through a large a gearwheel with a wheelset, and the lower part of the housing is a sump for oil containing 6 bearings and a lubrication system for gears and bearings, consisting of special channels, grooves and grooves made with the possibility of splashing liquid lubricant. The gearbox contains one cylindrical bearing, one double row tapered bearing and four single row tapered bearings. The housing contains three gears, including a pinion shaft connected through an intermediate gearwheel with a large gearwheel rigidly connected to the hub pressed onto the axle of the wheelset, the axle of the intermediate gearwheel is located below the axis of the wheelset. The teeth of the large gear wheel and the intermediate gear wheel are immersed in an oil bath of the gearbox housing, the suspension on the bogie frame is axial-support, the gear ratio is 2.9 (patent RU40038, IPC B61F 3/00, F16H 37/02, publ. 27.08.2004 ).

The disadvantage of this gearbox is that it is single-stage and has a small gear ratio. Also, the disadvantages include the use of single-row tapered bearings on the intermediate shaft, which require precise installation and complex adjustment, which negatively affects the manufacturability of manufacture and assembly. In addition, the use of tapered bearings does not provide a sufficient service life of the gearbox.

As a prototype for the proposed utility model in terms of the technical essence and the achieved result, a two-stage cylindrical gearbox was selected, which is used in the traction drive of the bogie of a rail vehicle (patent CN110576872 (V61V 15/00, V61V 13/02, V61F 5/10, V61F 5/30 , В61С 9/38, В61С 9/50, F16D 25/061, F16D 25/0638, publ. 12/17/2019). The gearbox consists of an input shaft with a gear, an intermediate shaft with a gear and a wheel, and an output shaft with a wheel. the shaft and the intermediate shaft wheel form the first stage, and the intermediate shaft gear and the driven shaft wheel form the second gear stage.

The design of the bearing arrangements is not described in this patent. However, this can greatly affect the reliability and service life of the gearbox.

The technical result to be achieved by the proposed utility model consists in increasing the manufacturability of manufacturing, assembly and adjustment, as well as reducing wear and increasing the service life.

The specified technical result is achieved by the fact that the two-stage gearbox of the traction drive consists of a housing with an input gear shaft located inside, connected by a gear transmission with a wheel mounted on an intermediate gear shaft connected by a gear transmission with a wheel mounted on the output shaft, the shafts are installed in bearing supports, and differs in that the bearing arrangements of the input gear shaft and the intermediate gear shaft consist of a roller bearing and a four-point contact angular contact ball bearing.

The proposed utility model is illustrated by the following drawings:

FIG. 1 - two-stage traction drive gearbox, general view;

FIG. 2 - two-stage traction drive gearbox, section;

FIG. 3 - gearbox with wheelset;

FIG. 4 - gearbox with electric motor and wheelset.

The two-stage gearbox of the traction drive (Fig. 1) consists of a housing 1, an input gear shaft 2 and an output shaft 3. Between the input gear shaft 2 and the output shaft 3 there is an intermediate gear shaft 4 (Fig. 2) connected by a gear train 5 with a wheel 6 mounted on the output shaft 3. On the intermediate gear shaft 4, a wheel 7 is installed, connected by a gear train 8 with an input gear shaft 2. The input gear shaft 2 is installed in bearing arrangements consisting of roller bearings 9 and ball radial thrust bearing with four-point contact 10. Intermediate gear shaft 4 is installed in bearing arrangements consisting of roller bearings 11 and angular contact ball bearing with four-point contact 12. Output shaft 3 is installed in bearing arrangements consisting of tapered bearings 13. In the output shaft 3, a through hole 14 is made.

The input gear shaft 2 receives torque from the electric motor 15 through the gear coupling 16. The output shaft 3 is connected to the axle of the wheel pair 17, which passes through the through hole 13.

Application.

The reducer is installed on the motor bogie of a subway car and is designed to transmit torque from the traction motor to the axle of the wheelset. The gearbox provides a decrease in the number of revolutions and an increase in the torque transmitted from the electric motor to the wheelset.

The implementation of the bearing supports of the input gear shaft and the intermediate gear shaft, consisting of a roller bearing and a ball angular contact bearing with a four-point contact, makes it possible to improve the manufacturability and assembly of the gearbox. Bearing alignment is not required, as is the case with tapered bearings, allowing for less stringent dimensional tolerances to ensure bearing alignment. More accurate bearing alignment reduces radial and end runout and, consequently, vibration and bearing wear, which leads to increased gearbox reliability and service life. Operating experience has shown that the resource of the gearbox reaches 5,000,000 km, which is unattainable when using tapered bearings.

Thus, the solutions presented in the utility model ensure the achievement of a technical result.

Claims (1)

A two-stage traction drive gearbox, consisting of a housing with an input gear shaft located inside, connected by a gear transmission with a wheel mounted on an intermediate gear shaft connected by a gear transmission with a wheel mounted on an output shaft, the shafts are installed in bearing supports, characterized in that The bearing arrangements of the input pinion shaft and the intermediate pinion shaft consist of a roller bearing and a four-point contact angular contact ball bearing.

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