TRANSMISSION UNIT OF A VEHICLE WITH CHAIN ​​DRIVE AND TIRE INFLATION THROUGH AXLE SHAFTS

Abstract

This utility model pertains to transport engineering, specifically to transmission units for off-road vehicles with loaded axles, enabling tire inflation while driving. The technical result is to enable tire inflation while driving for an off-road vehicle with a chain drive, while minimizing the number of moving, sealed joints in the air duct.The technical result is achieved in a transmission unit of a vehicle with a chain drive and tire inflation via half-axles, comprising a housing, rotating half-axles mounted on bearings in the housing, driven sprockets of a chain drive secured on the rotating half-axles, and a connecting element of the half-axles for fastening wheels, wherein the rotating half-axles are made hollow, the transmission unit is additionally provided with a central air duct connected to the housing, there are hollow axles connected to the air duct and brought out to the sides of the housing, the rotating half-axles are supported on one side by the hollow axles through bearings, on the other side by the housing through bearings, there are air ducts connecting the internal cavities of the rotating half-axles with the cavities of the tires, there is a movable sealed connection of the air supply tract, made in the form of an oil seal between the rotating half-axle and the hollow axle. 1 Fig.

Description

[0001] The utility model relates to the field of transport engineering, namely to transmission units of vehicles, including off-road vehicles, with loaded axle shafts, providing the ability to inflate tires on the move.

[0002] Analogs of the device are known - half-shafts of the drive axles of VAZ-2101 and Toyota Land Cruiser 70 vehicles, containing loaded half-shafts with wheel mounting flanges and splined ends for connection with the final drive gearboxes, installed in the axle housings on bearings and providing transmission of torque from the gearbox to the drive wheel.

[0003] The disadvantage of analogs is that the design of the axles and bridges does not provide for internal air channels and a movable sealed connection for supplying compressed air, as a result of which it is impossible to inflate tires while driving.

[0004] A known analogue of the device is a vehicle transmission with a chain drive of all wheels - US 4166512 A, selected as a prototype, containing a housing with transverse and longitudinal beams, loaded wheel axles mounted on bearings in the housing, driven sprockets secured to the wheel axles, and drive chains transmitting torque from the engine to the sprockets and then to the wheels.

[0005] The disadvantage of the prototype is that the design of the transmission unit does not provide for a tire inflation system: the wheel axles and body elements do not have internal air cavities and channels for supplying compressed air to the tires, as well as a sealed movable connection of the air duct, which does not allow for tire inflation while driving.

[0006] The technical result of the utility model is to ensure inflation of tires of an off-road vehicle with a chain drive while moving with a minimum number of movable sealed joints of the air duct.

[0007] The technical result is achieved in a transmission unit of a vehicle with a chain drive and tire inflation through half-axles, comprising a housing, rotating half-axles mounted on bearings in the housing, driven sprockets of a chain drive secured on the rotating half-axles, and a connecting element of the half-axles for fastening wheels, wherein the rotating half-axles are made hollow, the transmission unit is additionally provided with a central air duct connected to the housing, there are hollow axles connected to the air duct and brought out to the sides of the housing, the rotating half-axles rest on one side on the hollow axles through bearings, on the other side on the housing through bearings, there are air ducts connecting the internal cavities of the rotating half-axles with the cavities of the tires, there is a movable sealed connection of the air supply tract, made in the form of an oil seal between the rotating half-axle and the hollow axle.

[0008] Fig. 1 shows a sectional view of the transmission unit of a vehicle with a chain drive and tire inflation through the axle shafts.

[0009] The transmission unit of a vehicle with a chain drive and tire inflation through the half-axles comprises a housing 1, rotating half-axles 2 mounted on bearings 3 in the housing 1, driven sprockets 4 of the chain drive secured on the rotating half-axles 2, and a connecting element 5 of the half-axles 2 for fastening wheels 6, wherein the rotating half-axles 2 are made hollow, the transmission unit is additionally provided with a central air duct 7 connected to the housing 1, there are hollow axles 8 connected to the air duct 7 and brought out to the sides of the housing 1, the rotating half-axles 2 rest on one side on the hollow axles 8 through bearings 9, on the other side on the housing 1 through bearings 3, there are air channels 10 connecting the internal cavities 11 of the rotating half-axles 2 with the cavities of the tires 12, there is a movable sealed connection of the feed path air, made in the form of a seal 13 between the rotating axle shaft 2 and the hollow axle 8.

[0010] Let's consider an example of the implementation of a transmission unit of a vehicle with a chain drive and tire inflation through the axle shafts.

[0011] The transmission unit housing 1 is designed as a welded beam, which is part of the off-road vehicle frame. A circular metal air duct 7 is positioned within the beam along the longitudinal axis of the vehicle and is connected to the vehicle's pneumatic system. The transmission is symmetrical relative to the axis of symmetry 14; only one side is shown in Fig.

[0012] Two hollow axles 8, led out to the sides of the housing, are welded to the air duct 7; the internal cavity of each axle communicates with the cavity of the air duct 7. A rotating half-axle 2 is mounted on the outer end of each hollow axle 8 through rolling bearings 9, the outer end of which rests on outer bearings 3, fixed in the housing 1. A driven sprocket 4 of the chain drive is fixed on the middle part of the half-axle 2 along splines 15, connected by a chain to the leading sprocket of the gearbox output. On the outer end of the half-axle 2, a flange 5 is made with holes for fastening bolts 16 for fastening a wheel disk with a tire. Instead of flange 5, there may be another connecting element, for example, a splined connection with a seal in the form of an annular groove with a rubber ring. Axial cavities are formed inside the hollow axle 8 and the half-axle 2. The wheel has an air channel 10 connecting the cavity of the axle shaft 2 with the cavity of the tire.In the area where rotating axle shaft 2 connects to hollow axle 8, seal 13 is installed, forming the only movable, sealed connection of the air duct. Seals 17 are located near the outer bearings 3, preventing the ingress of water and dirt.

[0013] Let's consider the operation of a chain-driven vehicle's transmission unit with tire inflation via the axle shafts. While the off-road vehicle is in motion, the driver turns on the compressed air supply to the central air duct 7. Air flows sequentially through the hollow axles 8, then through the rotating axle shafts 2, and through the radial channels 10 in the disks into the tire cavities. Rotation of the axle shafts 2 relative to the housing 1 does not compromise the air duct's seal, since its only movable joint is provided by a single seal 13. Tire pressure is regulated by varying the pressure in the air duct line 7, and if pressure reduction is necessary, air is released through the standard pneumatic system pressure regulation devices.

Claims

A transmission unit for a vehicle with a chain drive and tire inflation via half-axles, comprising a housing, rotating half-axles mounted on bearings in the housing, driven sprockets of the chain drive secured on the rotating half-axles, and a connecting element of the half-axles for fastening wheels, characterized in that the rotating half-axles are made hollow, the transmission unit is additionally provided with a central air duct connected to the housing, there are hollow axles connected to the air duct and brought out to the sides of the housing, the rotating half-axles rest on one side on the hollow axles via bearings, on the other side on the housing via bearings, there are air ducts connecting the internal cavities of the rotating half-axles with the cavities of the tires, there is a movable sealed connection of the air supply tract, made in the form of a seal between the rotating half-axle and the hollow axle.

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