RU215969U1 - Driven portal axle with electric drive - Google Patents

Abstract

The utility model relates to self-propelled road vehicles, namely to devices for locating engines in the driving wheels of a vehicle or near them, and concerns the device of a portal drive axle of a low-floor passenger multi-seat wheeled vehicle. The technical problem solved by the proposed utility model is to improve the lubrication conditions of gearboxes, increase the transmission efficiency, reduce the oil temperature, increase the service intervals for changing the oil due to the improvement of its operating conditions. SUBSTANCE: drive portal axle with electric drive contains a connecting beam, at each end of which there is a bearing housing, in which an electric drive motor is located, connected through at least one gearbox with the axis of at least one wheel, a brake mechanism, the motor shaft being located with axial displacement relative to wheel axis down, the connecting beam is located below the wheel axis, the drive gear of the first stage of the gearbox is kinematically connected to the driven gear of the gearbox to transmit torque through the gear unit, consisting of the driven gear of the first stage of the gearbox and the drive gear of the second stage, the gearbox is made as a two-stage reduction gear, the gears of the first the gear stages of which are partially immersed in an oil bath. According to the technical solution, the gearbox is equipped with oil-catching pockets and a storage cavity with a casing, as well as a pocket that limits the volume of oil in the area of the drive gear of the first stage of the gearbox.

Description

The utility model relates to self-propelled road vehicles, namely to devices for locating engines in the driving wheels of a vehicle or near them, and concerns the device of a portal drive axle of a low-floor passenger multi-seat wheeled vehicle.

From the prior art, a portal bridge of a low-floor vehicle is known, including a connecting beam, at each end of which a supporting housing is located, in which a drive motor is located, connected through a gearbox to the wheel axle, twin wheel disks and a brake mechanism, the motor shaft being located with axial displacement relative to wheel axis down, the connecting beam is located below the wheel axis, and the drive gear of the reducer is kinematically connected to transmit torque through the gear block with the driven gear [1].

A disadvantage of the known device is the impossibility of obtaining a high gear ratio of a single-stage gearbox due to its placement and the brake mechanism in the space limited by the rim.

The closest to the proposed technical solution is a portal bridge of a low-floor vehicle, including a connecting beam, at each end of which there is a bearing housing, in which a drive motor is located, connected through a gearbox to the wheel axle, twin wheel disks and a brake mechanism, the motor shaft is located with axial displacement relative to the wheel axis downwards, the connecting beam is located below the wheel axis, and the drive gear of the gearbox is kinematically connected to transmit torque through the gear block with the driven gear, the gearbox is made as a two-stage reduction gear and is equipped with an auxiliary gear, which, being engaged with one of the gears of the specified block, partially immersed in an oil bath, while the gearbox and the actuator of the brake mechanism, at least partially, are located inside the disks of the twin wheels [2].

The disadvantage of this technical solution is the increased hydraulic energy losses during its operation, affecting the reduction in transmission efficiency, the increase in oil temperature.

The reason for the above is as follows. The displacement of the engine when using cylindrical multi-stage reduction gears causes the lower location of high-speed gears, which, if it is necessary to maintain a long service interval for servicing the gearbox under the conditions of layout restrictions, leads to the need for significant immersion in an oil bath. With this arrangement of gears, hydraulic losses increase, the transmission efficiency decreases, and the oil temperature rises. As a result, it is required to reduce the service intervals for changing the oil due to the deterioration of its operating conditions. In addition, at high circumferential speeds of the wheels, centrifugal force throws oil off the teeth, and the engagement works with insufficient lubrication.

The technical problem solved by the proposed utility model is to improve the conditions for lubricating gearboxes and eliminate the above disadvantages.

1. The technical problem is solved by the fact that the leading portal bridge with an electric drive, containing a connecting beam, at each end of which there is a bearing housing, in which an electric drive motor is located, connected through at least one gearbox with the axis of at least one wheel, a brake mechanism , and the motor shaft is located with an axial displacement relative to the wheel axis downwards, the connecting beam is located below the wheel axis, the drive gear of the first stage of the gearbox is kinematically connected to the driven gear of the gearbox for transmitting torque through the gear block, consisting of the driven gear of the first stage of the gearbox and the drive gear of the second stages, the gearbox is made as a two-stage reduction gear, the gears of the first stage of the gearbox are partially immersed in an oil bath, according to the proposed technical solution, the gearbox is equipped with oil-catching pockets and a storage cavity with a casing, as well as a pocket that limits the volume of oil in the drive zone. schey gears of the first stage of the gearbox.

Preferably, the storage cavity is provided with a bottom opening.

The utility model is illustrated by graphic materials, which show the following images:

fig. 1 - General view of the leading portal bridge with electric drive;

fig. 2 - two-stage gearbox, general view;

fig. 3 - diagram of the movement of oil in the gearbox;

fig. 4 - schematic placement of the accumulative cavity of the gearbox, front view;

fig. 5 - schematic placement of the casing of the storage cavity, rear view.

The drawings indicate the following elements:

1 - rest oil level;

2 - oil level during operation of the leading portal axle;

3 - pocket;

4 - drive gear of the first stage of the gearbox;

5 - driven gear of the first stage of the gearbox;

6 - casing;

7 - oil catching pocket;

8 - oil catching pocket;

9 - driven gear of the second stage of the gearbox;

10 - storage cavity;

11 - top hole;

12 - lower edge of the pocket wall;

13 - bearing;

14 - bottom hole;

15 - drive gear of the second stage of the gearbox;

16 - bearing;

17 - bearing;

18 - the first reduction gear;

19 - axis of the engine;

20 - wheel axle;

21 - connecting beam;

22 - drive motor;

23 - suspension elements;

24 - bearing body;

25 - brake mechanism;

26 - brake disc;

27 - second reduction gear;

28 - wheel hub.

29 - oil bath.

The drive portal bridge with electric drive includes a connecting beam 21, at each end of the connecting beam 21 there is a bearing housing 24, in which at least one electric drive motor 22 is located on each side of the bridge. The electric drive motor 22 is connected through gearboxes 18 and 27 with the axle 20 of the wheels (not shown), respectively. The leading portal axle is equipped with a brake mechanism 25 with a brake disc 26 (only shown for one side of the axle). Shaft (not shown) of the electric drive motor 22 is located with an axial offset relative to the axis 20 of the wheels down. The connecting beam 21 is located below the axis 20 of the wheels. The drive gear 4 of the first stage of the gearbox is kinematically connected to the driven gear 9 for transmitting torque through the gear unit, consisting of the driven gear 5 of the first stage of the gearbox and the drive gear of the second stage 15. The gearbox 18 is made of a two-stage reduction gear, the drive gear 4 and the driven gear 5 of the first stage the gearbox is partially immersed in the oil bath 29. Thus, in the two-stage reduction gearbox 18, the crankcase lubrication method is used. The gearbox 18 is equipped with oil-catching pockets 7 and 8 and a pocket 3 that limits the volume of oil in the zone of the drive gear of the first stage of the gearbox 4, as well as a storage cavity 10 with a casing 6. The drive portal axle is also equipped with a second planetary reduction gear 27. The output gear of the first reduction gear 18 axle shaft (not shown) is kinematically connected to the sun gear (not shown) of the planetary reduction gear 27. In addition, the storage cavity 10 is provided with an upper hole 11 and a lower hole 14.

Leading portal bridge with electric drive works as follows.

During rest, the oil in the gearbox crankcase is at the level of line 1. When the gearbox rotates, as the oil splashes and fills the oil-catching pockets 7 and 8, and the storage cavity 10, the oil level drops to the level of line 2, below the level of the upper part of the pocket 3. Pocket 3 limits the volume of oil in the area of the drive gear 4 of the first stage of the gearbox 18, and when the gear rotates, the oil is ejected from the pocket 3. The decrease in the oil level during rotation reduces the hydraulic losses due to mixing and splashing of the oil, and also provides more intensive oil circulation through the bearings 16.

During the rotation of the gearbox 18, the gear 5 of the first stage, due to the small radial clearance with the casing 6, provides a pumping effect. The oil lured by the teeth of the gear 5 enters with the help of the casing 6 through the hole 11 into the oil catch pocket 7.

The oil spreads through the oil-catching pocket 7, enters through the channels in the gearbox housings (not shown) to the bearings 13, 16 and 17 of the shafts (not shown in the drawing). When the oil level in the pocket 7 is above the lower edge 12 of the pocket wall, the oil fills the storage cavity 10, which has a hole 14 in the lower part. From the hole 14, the oil will fall on the small gear 15 of the second stage of the gearbox, providing lubrication of the gearing of the gears 15 and 9. The size of the hole 14 is selected in such a way that the oil is retained in the storage cavity 10.

The proposed design makes it possible to significantly increase the reliability of the electric drive of the drive portal axle due to constant and precise lubrication of all stages of the gearbox and bearings, as well as reduce hydraulic losses in the gearbox and increase the efficiency of the entire transmission. In addition, the complex of proposed solutions allows to increase the service interval of the drive portal axle with electric drive.

Sources of information:

1. CN 202448733, class. B60K 7/00, publ. 09/26/2012.

2. RU 146251 U1, class. B60K 7/00, publ. 10.10.2014.

Claims (2)

1. Leading portal bridge with electric drive, containing a connecting beam, at each end of which there is a bearing housing, in which an electric drive motor is located, connected through at least one gearbox with the axis of at least one wheel, a brake mechanism, and the motor shaft is located with axial displacement relative to the wheel axis down, the connecting beam is located below the wheel axis, the drive gear of the first stage of the gearbox is kinematically connected to the driven gear of the gearbox to transmit torque through the gear set, consisting of the driven gear of the first stage of the gearbox and the drive gear of the second stage, the gearbox is made as a two-stage reduction , the gears of the first stage of the gearbox of which are partially immersed in an oil bath, characterized in that the gearbox is equipped with oil trapping pockets and a storage cavity with a casing, as well as a pocket that limits the volume of oil in the area of the drive gear of the first stage of the gearbox. 2. Leading portal bridge with electric drive according to claim 1, characterized in that the storage cavity is provided with a bottom hole.

Images