Housing for front final drive of a snow and marsh vehicle

Abstract

A housing for a front final drive of a snow and marsh vehicle is made of metal and is in the form of a plate, the base of which is formed of parts in the shape of a larger-radius circle and a smaller-radius circle, with protruding elements arranged on both sides of the plate; the plate contains two apertures, a first aperture (1) for seating a bearing and mounting an input shaft cover, and a second aperture (2) for seating the shaft of an output shaft; the plate further comprises a cylindrical protrusion (6) for encircling the base of the shaft of the output shaft; in the upper part of the plate there is an arm (10) oriented in a horizontal plane at a right angle to the plate; a thickening in the middle part of the plate, between the first and second apertures, is configured in the form of lugs (18) which extend away from the vertical axis of symmetry and are provided with depressions, the lugs being intended for the mounting of brackets connected to a steering rod; and the joins of the elements are seamless and rounded. The result is that of providing mechanical support for a gear train and making it possible to secure the drive at the mounting site for the purpose of connecting the drive of a drive shaft and taking off torque from a driven shaft.

Description

FRONT FINAL DRIVE GEAR HOUSING OF ALL-TERRAIN VEHICLE

[0001] Technical area. This technical solution relates to transport engineering, specifically gearbox engineering. It can be used in the design of the final drive of the steered (front) wheel. It is used in off-road vehicles such as all-terrain vehicles and all-terrain vehicles.

[0002] The steering wheels determine the direction of the vehicle's movement. The position of the steering wheels relative to the vehicle's longitudinal axis can be changed by steering mechanisms to change the vehicle's direction of travel.

[0003] High torque and reliability are essential for all-terrain vehicles. However, all-terrain vehicles and snow and swamp vehicles typically have relatively large wheels, so reducing the torque in the transfer case is insufficient to transmit the required torque. Therefore, final drives are installed on each wheel.

[0004] The final drive housing design for the drive wheels, both steered and non-steered, differs and is determined by the suspension type and design. The steered (front) wheel housing must allow for wheel rotation and deflection relative to the vehicle's body / frame to change direction.

[0005] The gearbox housing is a component that provides mechanical support for the gear train components, allows the gearbox to be secured in place, connects the drive shaft, and transfers torque from the driven shaft. The gearbox housing is the load-bearing element for moving components. Gearbox housings often contain structural elements that prevent the buildup of pressure inside the gearbox caused by heat buildup during operation. It is traditionally made of cast iron or aluminum using mold casting methods.

[0006] In industrial practice, gearbox housings for machines are usually produced using the casting method from cast iron, steel, and aluminum alloys.

[0007] The final drives of the uncontrolled wheel of the Soviet wheeled armored personnel carrier BTR-80, BTR-60 [1] are known, containing a housing with a cover, with input and output shafts located in it, with a gear transmission, including a pinion and a gear wheel connected to the shafts.

[0008] The final drive housing [1] is made of metal and consists of smoothly connected structural elements, contains two openings located in the same plane on the vertical axis of symmetry of the plate, the first opening, located in the upper part of the plate, is intended for seating the bearing and installing the input shaft cover; the second opening, located in the lower part of the plate, is intended for seating the output shaft axis; on the inner side, coaxially to the second opening, it contains a cylindrical projection intended for embracing the base of the output shaft axis, on the outer surface of the projection there is a seat for the output shaft support bearing. In the upper part of the housing there is a lever rising above the body of the housing, with an opening oriented in the horizontal plane for placing the connecting axis in a horizontal position, for fastening to the upper arm of the APC suspension.At the bottom of the body there is a similar lever with a hole oriented in a horizontal plane for placing the connecting axis in a horizontal position for attachment to the lower arm of the APC suspension.

[0009] The gearbox housing [1] is not suitable for driving the steering wheel of all-terrain vehicles. The housing's fastening elements, shape, and geometric parameters are not suitable for connection to the suspension arms of the all-terrain vehicle's steering wheel. The housing is bulky, excessively thick, and heavy. The design complicates repair and adjustment, and the sealed housing does not provide for the release of excess internal pressure.

[0010] A final drive [2] is known, designed to improve the cross-country capability of a vehicle. It comprises a gear transmission with internal engagement and a bracket supporting the vehicle's wheel axis of rotation. The housing is adapted for installation on the vehicle's standard wheel hub with the ability to rotate relative to it and is equipped with means for fastening to vehicle components.

[0011] To mount the gear transmission mechanism and fasten the gearbox to the installation site, the housing must have the appropriate components with the specified geometry, dimensions, and relative positions appropriate for the installation site. The gearbox housing [2] is not suitable for driving the steered wheel of all-terrain vehicles; the housing fastening elements, shape, and geometric parameters are not suitable for connection to the suspension arms of the steered wheel of an all-terrain vehicle.

[0012] The structural elements of known hulls have different shapes and sizes due to differences in the parameters of the gears used and installation locations, but they are not suitable for all-terrain vehicles (for example, the Burlak type).

[0013] The housing of the front final drive of the all-terrain vehicle is made of metal and consists of smoothly connected structural elements in the form of a plate, the base of which is formed by connected parts, in the form of circles of a larger and smaller radius, with protruding elements located on both sides of the plate; the plate contains two openings located in the same plane on the vertical axis of symmetry of the plate: the first opening 1, located in the upper part of the plate, is intended for seating the bearing and installing the input shaft cover; the second opening 2, located in the lower part of the plate, is intended for seating the output shaft axis; on the inner side 3, coaxially to the second opening, the plate contains a cylindrical protrusion 6, intended for embracing the base of the output shaft axis, on the outer surface of the protrusion there is a seat (75 mm in diameter) for the output shaft support bearing;On the inside, the plate contains two rows of recesses 9 intended for fastening the main cover of the gearbox: the first row of recesses (5 pieces) is located coaxially with the axis of the first hole; the second row of recesses (13 pieces) is located coaxially with the axis of the second hole; the diameter of the circle of the first row of recesses (136 mm) is less than the diameter (276 mm) of the circle of the second row of recesses; on the outside, coaxially with the axis of the first hole, the plate contains a row of recesses (8 pieces) intended for fastening the cover of the input shaft; in the upper part of the plate there is an upper lever 10, oriented in a horizontal plane at a right angle to the plate, directed to the outside, at the end of the upper lever there is a mounting hole (43 mm in diameter) for accommodating a bushing located vertically, intended for accommodating the connecting axis of the upper suspension arm; the side surfaces of the lever and the plate are connected by stiffening ribs;in the lower part of the plate there is a lower lever 14, oriented in a horizontal plane at a right angle to the plate, directed to the outside, at the end of the lower lever there is a mounting hole (43 mm in diameter) for placing a bushing located vertically, intended for placing the connecting axis of the lower suspension arm; the upper lever is longer than the lower lever; in the area around the first and second holes there is a thickening 17, the thickening in the area of ​​the first hole is connected to the stiffening ribs of the upper lever, the thickening in the area of ​​the second hole is made of a rounded shape and is connected by two stiffening ribs to the thickening located along the perimeter of the lower part of the plate;the thickening in the middle part of the plate, between the first and second holes, is made in the form of rectangular bosses 18 diverging from the vertical axis of symmetry, equipped with recesses, intended for mounting brackets connected to the steering rod (for the left or right side), and the connections of the elements are made smooth with roundings.

[0014] Ensures that the gearbox housing is compatible with its installation location for connection to the suspension arms of the all-terrain vehicle's steering wheel, for mounting gear transmission elements with a gear ratio of 3.8, a maximum permissible torque of 3000 Nm, with a sufficient level of reliability and strength.

[0015] The technical task is to improve the design of the final drive housing of the steerable wheel for an all-terrain vehicle, in order to ensure the possibility of placing bearing supports for the input and output shaft of the gear transmission, fixing the main cover of the gearbox, the input shaft cover, and movable fastening of the gearbox housing in a given position to the suspension arms of the all-terrain vehicle, while ensuring the reliability and ability of the part to withstand mechanical loads.

[0016] The problem is solved by constructing a metal housing for the front final drive of the all-terrain vehicle, consisting of seamlessly interconnected structural elements. The housing is designed as a plate, the base of which is formed by mating parts shaped like circles of larger and smaller radii, with protruding elements located on either side of the plate. The plate contains two openings located in the same plane on the plate's vertical axis of symmetry:

[0017] the first hole, located in the upper part of the plate, is intended for seating the bearing and installing the input shaft cover;

[0018] the second hole, located in the lower part of the plate, is intended for mounting the output shaft axis;

[0019] on the inner side, coaxially to the second hole, the plate contains a cylindrical protrusion designed to cover the base of the output shaft axis; on the outer surface of the protrusion, a seat with a diameter of 75 mm is made for the support bearing of the output shaft;

[0020] On the inside, the plate contains two rows of recesses intended for fastening the main cover of the gearbox:

[0021] the first row of recesses, 5 in number, is located coaxially to the axis of the first hole;

[0022] the second row of recesses, 13 in number, is located coaxially to the axis of the second hole;

[0023] the diameter of the circumference of the first row of recesses is 136 mm less than the diameter of the circumference of the second row of recesses is 276 mm;

[0024] on the outside, coaxially with the axis of the first hole, the plate contains a series of recesses, 8 in number, intended for fastening the input shaft cover;

[0025] in the upper part of the plate there is an upper lever, oriented in a horizontal plane at a right angle to the plate and directed outward; at the end of the upper lever there is a mounting hole with a diameter of 43 mm for accommodating a bushing located vertically, designed to accommodate the connecting axis of the upper suspension arm;

[0026] the side surfaces of the lever and the plate are connected by stiffening ribs;

[0027] in the lower part of the plate there is a lower lever, oriented in a horizontal plane at a right angle to the plate directed outward, at the end of the lower lever there is a mounting hole with a diameter of 43 mm, for placing a bushing located vertically, designed to accommodate the connecting axis of the lower suspension arm;

[0028] the upper arm is longer than the lower arm;

[0029] in the area around the first and second holes, a thickening is made, the thickening in the area of ​​the first hole is connected to the stiffening ribs of the upper lever, the thickening in the area of ​​the second hole is made in a round shape and is connected by two stiffening ribs to the thickening located along the perimeter of the lower part of the plate;

[0030] The thickening in the middle part of the plate, between the first and second holes, is made in the form of rectangular bosses diverging from the vertical axis of symmetry, equipped with recesses intended for mounting brackets connected to the steering rod.

[0031] The housing provides mechanical support for the gear train components, allows for mounting the gearbox at the installation site, connects the drive shaft, and transfers torque from the driven shaft. The gearbox housing serves as a load-bearing element for the moving components.

[0032] The design simplifies the manufacturing technology, simplifies the operation of mounting and dismounting the gearbox, and also improves overall reliability, operational and technological characteristics.

[0033] The technical result consists in expanding the arsenal of technical means to ensure that the gearbox housing matches the place of its installation for connection with the suspension levers of the steered wheel of the all-terrain vehicle, for mounting the elements of the gear transmission with a gear ratio of 3.8, a maximum permissible torque of 3000 Nm, with a sufficient level of reliability and strength.

[0034] The above set of features allows us to solve the stated problem and ensures the stated technical result.

[0035] The technical solution can be explained by diagrams showing: Figure 1

[0036] General view of the body, from the outside. Figure 2

[0037] General view of the body, from the inside. Figure 3

[0038] Assembled body, in section. Figure 4

[0039] Complete body, front view. Figure 5

[0040] Final drive, sectional view.

[0041] The housing of the front final drive of an all-terrain vehicle, made of metal, consisting of smoothly connected structural elements in the form of a plate, the base of which is formed by connected parts, in the form of circles of a larger and smaller radius, with protruding elements located on both sides of the plate; the plate contains two openings located in the same plane on the vertical axis of symmetry of the plate: the first opening 1, located in the upper part of the plate, is intended for seating the bearing and installing the input shaft cover; the second opening 2, located in the lower part of the plate, is intended for seating the output shaft axis; on the inner side 3, coaxially to the second opening, the plate contains a cylindrical protrusion 6, intended for embracing the base of the output shaft axis, on the outer surface of the protrusion there is a seat (75 mm in diameter) for the output shaft support bearing;On the inside, the plate contains two rows of recesses 9 intended for fastening the main cover of the gearbox: the first row of recesses (5 pieces) is located coaxially with the axis of the first hole; the second row of recesses (13 pieces) is located coaxially with the axis of the second hole; the diameter of the circle of the first row of recesses (136 mm) is less than the diameter (276 mm) of the circle of the second row of recesses; on the outside, coaxially with the axis of the first hole, the plate contains a row of recesses (8 pieces) intended for fastening the cover of the input shaft; in the upper part of the plate there is an upper lever 10, oriented in a horizontal plane at a right angle to the plate, directed to the outside, at the end of the upper lever there is a mounting hole (43 mm in diameter) for accommodating a bushing located vertically, intended for accommodating the connecting axis of the upper suspension arm; the side surfaces of the lever and the plate are connected by stiffening ribs;in the lower part of the plate there is a lower lever 14, oriented in a horizontal plane at a right angle to the plate, directed to the outside, at the end of the lower lever there is a mounting hole (43 mm in diameter) for placing a bushing located vertically, intended for placing the connecting axis of the lower suspension arm; the upper lever is longer than the lower lever; in the area around the first and second holes there is a thickening 17, the thickening in the area of ​​the first hole is connected to the stiffening ribs of the upper lever, the thickening in the area of ​​the second hole is made of a rounded shape and is connected by two stiffening ribs to the thickening located along the perimeter of the lower part of the plate;the thickening in the middle part of the plate, between the first and second holes, is made in the form of rectangular bosses 18 diverging from the vertical axis of symmetry, equipped with recesses, intended for mounting brackets connected to the steering rod (for the left or right side), and the connections of the elements are made smooth with roundings.

[0042] The front final drive housing of the all-terrain vehicle is cast from grade 35KhNL steel (casting hardness ranges from 241 to 301 HB). The housing consists of seamlessly interconnected structural elements. The housing is designed as a plate, the base of which is formed by mating parts shaped like circles of larger and smaller radii, with protruding elements located on either side of the plate.

[0043] The plate contains two openings 1 and 2, located in the same plane on the vertical axis of symmetry of the plate:

[0044] the first hole 1, located in the upper part of the plate, is intended for seating the bearing and installing the input shaft cover, the diameter of the first hole is 90 mm (the dimensions here and below are indicated taking into account the inevitable permissible deviations, for example, the specified size of 90 mm has a maximum deviation of size according to H7 (tolerance) + 0.035 mm);

[0045] the second hole 2, located in the lower part of the plate, is intended for mounting the output shaft axis, the diameter of the second hole is 55 mm;

[0046] The center distance between the first and second holes is 145 mm.

[0047] The plate has an inner side (3) and an outer side (4). The inner side (3) is closed by the main cover (5) of the gearbox and, together with it, forms a closed internal cavity of the gearbox, which contains a gear transmission filled with lubricant (oil).

[0048] On the inner side 3, coaxial with the second opening 2, the plate contains a cylindrical projection 6 designed to enclose the base of the output shaft axis 7. On the outer surface of the projection 6, a seat 8, 75 mm in diameter, is formed for the output shaft support bearing. The straight-line distance from the outer surface 4 of the plate to the end of the cylindrical projection 6 is 95 mm.

[0049] Axle 7 is installed into bore 2 and projection 6, with an interference fit. Before installation, axis 7 is cooled in liquid nitrogen and installed until it rests against the housing; no gap is allowed between the axle flange and the housing. Axle 7 is connected to the housing with a weld.

[0050] On the inner side 3, the plate contains two rows of recesses 9, intended for fastening the main cover 5 of the gearbox:

[0051] the first row of recesses 9, in the amount of 5 pieces, is located coaxially to the axis of the first hole 1;

[0052] the second row of recesses 9, in the amount of 13 pieces, is located coaxially to the axis of the second hole 2;

[0053] The diameter of the circle of the first row of recesses is 136 mm, the diameter of the circle of the second row of recesses is 276 mm.

[0054] On the outer side 4, coaxially to the axis of the first opening 1, the plate contains a number of recesses 9 intended for fastening the input shaft cover.

[0055] The upper arm 10 is located in the upper part of the plate, oriented in the horizontal plane at a right angle to the plate, directed towards the outer side 4. At the end of the upper arm 10, a mounting hole 11 with a diameter of 43 mm is made for accommodating a vertically positioned bushing 12. Bushing 12 is designed to accommodate the connecting axle of the upper arm of the all-terrain vehicle's steering wheel suspension, for attaching the gearbox to the body / frame. Bushing 12 is installed in hole 11 with an interference fit. Before installation, bushing 12 and the conical washer are cooled in liquid nitrogen. Install it until it stops against the upper arm 10; no gap is allowed between the flanges of the components and the body.

[0056] The side surfaces of the upper arm 10 and the plate are connected by stiffening ribs 13. The straight-line distance from the inner surface of the plate to the axis of the mounting hole 11 of the upper arm 10 is 150 mm. The straight-line distance from the outer surface of the upper arm 10 to the axis of the first hole 1 is 140 mm.

[0057] The lower arm 14 is located in the lower part of the plate, oriented in the horizontal plane at a right angle to the plate and directed towards the outer side 4. At the end of the lower arm 14, a mounting hole 16 with a diameter of 43 mm is made for accommodating a bushing 15 located vertically. Bushing 15 is designed to accommodate the connecting axle of the lower arm 14 of the all-terrain vehicle steering wheel suspension, for attaching the gearbox to the body / frame. Bushing 15 is installed in the hole 16 with an interference fit. Before installation, bushing 15 and the conical washer are cooled in liquid nitrogen. Install it until it stops against the lower arm 14; no gap is allowed between the flanges of the parts and the body.

[0058] The upper arm 10 is longer than the lower arm 14, the center distance between the holes 11 and 16 of the upper and lower arms is 66 mm.

[0059] In the area around the first 1 and second 2 holes, a thickening 17 is made.

[0060] The thickening 17 in the area of ​​the first hole is connected to the stiffening ribs 13 of the upper lever 10.

[0061] The thickening 17 in the area of ​​the second hole is made in a rounded shape and is connected by two stiffening ribs 19 with the thickening 20 located along the perimeter of the lower part of the plate.

[0062] The thickening 17 in the middle part of the plate, between the first 1 and second 2 holes, is made in the form of rectangular bosses 18 diverging from the vertical axis of symmetry, equipped with recesses intended for mounting brackets 22 connected to the steering rod (for the left or right side).

[0063] The transitions and connections of the elements are smooth and rounded.

[0064] The thickness of thickening 17 is equal to the thickness of upper arm 10 and the thickness of lower arm 14 and is 30 mm. The thickness of thickening 20, located along the perimeter of the lower part of the plate, is 10 mm. The thickness of stiffening ribs 13 and 19 is 10 mm.

[0065] Using the case

[0066] The front final drive housing of the all-terrain vehicle provides mechanical support for the gear components of the gearbox with one moving axis (leading input shaft) and one fixed axis (driven output shaft), mechanical protection for the internal components and a sealed container (in combination with the main cover) for the grease that lubricates these gear components.

[0067] The front final drive housing of the all-terrain vehicle allows the gearbox to be attached to the vehicle body / frame using the steering wheel suspension arms, which is necessary for connecting the drive shaft and installing the steering wheel on the gearbox hub to remove torque from the driven shaft.

[0068] Housing 21 is a supporting part of the front final drive of the all-terrain vehicle (type "Burlak"), designed to transmit rotation to the steered wheel of the all-terrain vehicle.

[0069] For intended use, the axis 7 of the output shaft 24 is fitted with tension into the second opening 2 of the housing 21, located in the lower part of the plate.

[0070] Bushing 12 is installed with tension into mounting hole 11 of upper arm 10. Bushing 12 allows the connecting axis of the upper arm of the all-terrain vehicle suspension to be placed in a vertical position and provides a movable connection for fastening the gearbox to the body / frame of the all-terrain vehicle.

[0071] Bushing 15 is installed with tension into mounting hole 16 of lower arm 14. Bushing 15 allows for vertical placement of connecting axis of lower arm 14 of all-terrain vehicle suspension and provides a movable connection for fastening gearbox to body / frame of all-terrain vehicle, with the possibility of turning wheel from longitudinal axis of all-terrain vehicle.

[0072] In the housing 21, there are support bearings 27, 28 of the input shaft 23 and the output shaft 24 of the gear transmission, including the pinion 25 and the gear wheel 26.

[0073] A bearing 27 with an outer diameter of 90 mm of the input shaft 23 is installed in the first hole 1, located in the upper part of the plate. The second bearing 27 of the input shaft 23 is installed in the main cover 5.

[0074] A bearing 28 with an internal diameter of 75 mm of the output shaft 24 is installed on the cylindrical projection 6 in the area of ​​the seat 8. A second bearing 28 of the output shaft 24 is installed on the axis 7. The cylindrical projection 6 covers the axis 7 for a length of 95 mm, which ensures a strong fixation of the axis 7 and sufficient reliability in transmitting rotation, axial and radial loads.

[0075] Output shaft 24 with gear wheel 26 is mounted on bearings 28. The axis of gear 25 of input shaft 23 is mounted on bearings 27. The center distance between the first 1 and second 2 holes ensures the installation of a gear transmission (gear 25 and gear wheel 26) with a gear ratio of 3.8, maximum permissible torque of 3000 Nm.

[0076] The main cover 5 (made of a figured shape formed by mating parts in the form of circles of a larger and smaller radius) is attached to the housing 21 from the inner side 3, fixing it with bolts 30, placed in two rows of recesses 9, the first row of recesses 9, in the amount of 5 pieces, the second row of recesses 9, in the amount of 13 pieces, provide a strong fixation and a hermetic connection of the cover 5 with the housing 21. The recesses 9 of the first row and the second row, made along the circumference, with bolts 30, provide a distribution of the load over the area of ​​the plate, when transmitting mechanical forces from the side of the cover 5 to the housing 21.

[0077] Bearing 27 of input shaft 23 is covered on the outer side 4 by cover 29, which rests against bearing 27. Cover 29 is secured with eight bolts 31, screwed into recesses 9. Recesses 9 ensure a tight fit of the cover and bearing. Input shaft 23 passes through cover 29 using sealing cuffs.

[0078] After assembly, the final drive is filled with lubricant. On the housing, on the inner side 3, in the upper part of the plate, there is a radial cavity (groove) connected to a through hole containing a breather valve, which prevents excessive pressure buildup inside the gearbox caused by heat buildup during operation.

[0079] To install the gearbox on the left side, bracket 22 is mounted to the right boss 18 using bolts 33 placed in the threaded recesses of boss 18.

[0080] To install the gearbox on the right side, bracket 22 is mounted to the left boss 18 using bolts 33 placed in the threaded recesses of boss 18.

[0081] Bracket 22, through boss 18 and thickening 17, transmits forces to housing 21 when transmitting traction force for turning the wheel, from the side of the turning mechanism.

[0082] Wheel hub 32 is attached to the free end of the gearbox's output shaft 24. It transmits torque from input shaft 23 via a gear train. Wheel hub 32 also transmits multidirectional loads to housing 21 from the all-terrain vehicle's wheel.

[0083] The housing allows the final drive to be mounted where needed to transmit torque and turn the steering wheel. The final drive, using levers 10 and 14 of the housing, is secured to the upper and lower suspension arms of the all-terrain vehicle and connected to the steering rod via bracket 22.

[0084] Levers 10 and 14 are oriented in a horizontal plane at a right angle to the plate, directed towards the outer side 4, which allows the housing to be installed in a given position and connected to the suspension arms and steering rod through bracket 22.

[0085] Levers 10 and 14 provide the ability to mount the gearbox housing on the all-terrain vehicle, connect it to the suspension elements, and transmit forces, withstanding the load from the weight of the all-terrain vehicle and the impact load from the wheel, as well as the ability to deflect the plane of rotation of the wheel from the longitudinal axis of the all-terrain vehicle to change the direction of movement.

[0086] The thickness of the levers, the presence of thickenings and stiffening ribs provide the necessary strength and reliability for attaching the gearbox to the body / frame of the all-terrain vehicle.

[0087] Stiffening ribs 13 and 19, thickening 17, and bosses 18 provide mechanical strength to the body, transmit forces, and withstand bending, tensile, compressive, and impact loads. The transitions and joints between the elements are smooth and rounded, reducing localized mechanical stress concentration and the risk of cracks. The dimensional ratio of the body elements allows for the installation of the final drive on the all-terrain vehicle and its attachment to the steerable wheel hub.

[0088] The axis 7 is fixedly secured in the housing 21, and its base is covered by the housing material along its length until it stops at the flange, which makes it possible to withstand mechanical loads.

[0089] Input shaft 23 is made integral with a flange designed to interact with the axle via a cardan drive.

[0090] The support bearing 28 of the output shaft 24, installed on the seat 8 of the projection 6 of the housing, is located in the same plane as the gear transmission, which allows for the optimal distribution of loads on the housing and shafts.

[0091] In the upper part of the housing 1 there is a breather 26 made in the form of a hole with a groove and a tube, which ensures the release of excess internal pressure in the sealed housing.

[0092] The proposed front final drive housing expands the range of gear housings available for wheeled all-terrain vehicles. It allows for the installation of a gear transmission with a 3.8-speed reduction and a torque of up to 3000 Nm to drive the steered (front) wheel. This allows the vehicle to rotate at a maximum speed of 80 km / h, with a vehicle weighing 4 tons. Testing has demonstrated the reliability of the gear housing and its ability to withstand multidirectional loads thanks to its design.

[0093] The advantages over similar products include the ability to use a gearbox with a gear ratio of 3.8 and a maximum permissible torque of 3000 Nm on an all-terrain vehicle, while ensuring sufficient reliability and strength for the steered wheel.

[0094] Manufactured using commercially available components and materials, its components can be manufactured and assembled both in a home-based manner and at modern industrial facilities. It is primarily intended for use in off-road vehicles, heavy-duty amphibious all-terrain vehicles, arctic all-terrain vehicles, and snow and swamp vehicles.

[0095] - first hole (designed to seat the bearing and install the input shaft cover); - second hole (designed to seat the output shaft axle); - inner side of the plate; - outer side of the plate; - gearbox cover; - protrusion; - output shaft axle; - seat; - recess; - upper arm; - hole; - bushing; - stiffeners; - lower arm (designed for connection with the lower arm of the all-terrain vehicle steerable wheel suspension, for attaching the gearbox to the body / frame); - bushing; - hole; - thickening; - boss; - stiffeners; - thickening; - housing; - bracket; - input shaft; - output shaft; - gear; - toothed wheel; - bearing; - bearing; - cover; - bolt; - bolt; - wheel hub; - bolt.

[0096] Source 1: BTR-80 wheel gearbox https: / / triptonkosti.ru / 25-foto / kolesnyj-reduktor-btr-80-shema.html.

[0097] patent RU 179573.

Claims

1. The housing of the front final drive of an all-terrain vehicle, made of metal and consisting of smoothly connected structural elements, characterized in that the housing is made in the form of a plate, the base of which is formed by connected parts, in the form of circles of a larger and smaller radius, with protruding elements located on both sides of the plate; the plate contains two openings located in the same plane on the vertical axis of symmetry of the plate: the first opening, located in the upper part of the plate, is intended for seating the bearing and installing the input shaft cover; the second opening, located in the lower part of the plate, is intended for seating the output shaft axis; on the inner side, coaxially to the second opening, the plate contains a cylindrical protrusion intended to embrace the base of the output shaft axis, on the outer surface of the protrusion there is a seat with a diameter of 75 mm for the output shaft support bearing;On the inside, the plate contains two rows of recesses intended for fastening the main cover of the gearbox: the first row of recesses, 5 in number, is located coaxially with the axis of the first hole; the second row of recesses, 13 in number, is located coaxially with the axis of the second hole; the diameter of the circle of the first row of recesses, 136 mm, is less than the diameter 276 mm of the circle of the second row of recesses; on the outside, coaxially with the axis of the first hole, the plate contains a row of recesses, 8 in number, intended for fastening the cover of the input shaft; in the upper part of the plate there is an upper lever, oriented in a horizontal plane at a right angle to the plate, directed to the outside, at the end of the upper lever there is a mounting hole with a diameter of 43 mm, for accommodating a bushing located vertically, intended for accommodating the connecting axis of the upper suspension arm; the side surfaces of the lever and the plate are connected by stiffening ribs;in the lower part of the plate there is a lower lever, oriented in a horizontal plane at a right angle to the plate, directed to the outside, at the end of the lower lever there is a mounting hole with a diameter of 43 mm, for placing a bushing, located vertically, intended for placing the connecting axis of the lower suspension arm; the upper lever is longer than the lower lever; in the area around the first and second holes there is a thickening, the thickening in the area of ​​the first hole is connected to the stiffening ribs of the upper lever, the thickening in the area of ​​the second hole is made of a rounded shape and is connected by two stiffening ribs with a thickening located along the perimeter of the lower part of the plate; the thickening in the middle part of the plate, between the first and second holes, is made in the form of rectangular bosses diverging from the vertical axis of symmetry, equipped with recesses, intended for mounting brackets connected to the steering rod.

2. The body according to paragraph 1, characterized in that it is cast from 35KhNL steel, and taking into account the inevitable permissible deviations, the thickness of the plate thickening is equal to the thickness of the lower and upper levers and is 30 mm, the thickness of the thickening located along the perimeter of the lower part of the plate is 10 mm, the thickness of the stiffening ribs is 10 mm.

3. The housing according to paragraph 1, characterized in that, taking into account the inevitable permissible deviations, the center-to-center distance between the first and second holes is 145 mm, the straight-line distance from the inner surface of the plate to the axis of the mounting hole of the lever is 150 mm, the straight-line distance from the outer surface of the lever to the axis of the first hole is 140 mm, the straight-line distance from the outer surface of the plate to the end of the cylindrical protrusion is 95 mm, the center-to-center distance between the holes of the upper and lower levers is 66 mm, the diameter of the first hole is 90 mm, the diameter of the second hole is 55 mm.

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