CN218771528U - Mechanical sealing device and driving wheel of mining dump truck with electric wheels - Google Patents

Abstract

The utility model discloses a mechanical sealing device, include: clamp plate, oil baffle ware, bearing frame, bearing, oil baffle dish, spacing ring, device housing bolt, the clamp plate includes: the pressing cylinder is connected to the middle of the transverse pressing ring, and the transverse pressing ring is provided with a plurality of pressing plate through holes; the pressing cylinder is axially provided with a pressing cylinder through hole, and the inner wall of the pressing cylinder is axially provided with a through groove; the bearing block is positioned in the pressing cylinder, and the bearing is arranged on the bearing block; the oil retainer is positioned at the inner side of the pressing cylinder, the end part of the inner side of the pressing cylinder is positioned at the outer end of the oil retainer, two L-shaped annular plates which are arranged along the axis are arranged in an inner cavity of the oil retainer, and the L-shaped annular plate at the outer side is provided with a notch; the outer wall of the oil deflector is provided with a flange, and an oil deflector through hole is formed in the flange; the limiting ring is positioned between the bearing seat and the oil retainer, and the oil retaining disc is sleeved on the outer wall of the limiting ring. The utility model also discloses a mining dump truck drive wheel of electronic round. The utility model discloses can make traction motor and effective isolation of wheel reduction gear.

Description

Mechanical sealing device and driving wheel of mining dump truck with electric wheels

Technical Field

The utility model belongs to mining dump truck field, concretely relates to mechanical seal device and mining dump truck drive wheel of electronic round thereof.

Background

The mining dump truck with electric wheels is equipment for transporting earthwork and mineral materials in an open-pit mine, and generally adopts a rear-drive mode. Wheel motors are respectively installed on two sides of a rear axle box of the electric wheel mining dump truck, and the wheel motors mainly comprise traction motors, a rack, a driving shaft, wheel hubs and wheel-side reducers. The traction motors are arranged in the machine frame, and each traction motor independently drives a wheel on one side. The power output by the traction motor is input into the hub reduction gear through the driving shaft, and drives wheels after being decelerated and torque-increased through the hub reduction gear, so as to further drive the vehicle to run. The wheel reduction gear is usually a planetary gear reduction mechanism, and lubricating oil needs to be filled during operation, so that the wheel reduction gear and the traction motor need to be isolated from each other by adding a seal, and the seal is usually arranged between a driving shaft and a frame.

Traction motor output speed is usually up to thousands of revolutions per minute, for effectively keeping apart wheel reduction and traction motor, adopts the contact sealed between drive shaft and the frame usually, and traction motor leads to the sealed seal lip position linear velocity of contact too high because the rotational speed is high for the sealed life-span of contact seal is shorter, the reliability is relatively poor, and change here sealed need disassemble the wheel motor, and the maintenance cost is higher.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a mechanical seal device and mining dump truck drive wheel of electronic round thereof can make traction motor and wheel reduction gear effectively keep apart.

In order to achieve the above object, the utility model uses the technical solution that:

a mechanical seal, comprising: clamp plate, oil baffle ware, bearing frame, bearing, oil baffle disc, spacing ring, device clamp bolt, the clamp plate includes: the device comprises a transverse compression ring and a compression cylinder, wherein the top of the compression cylinder is connected to the middle of the transverse compression ring, the transverse compression ring is provided with a plurality of compression plate through holes, and compression bolts of the device are arranged in the compression plate through holes; the pressing cylinder is axially provided with a pressing cylinder through hole, the inner wall of the pressing cylinder is axially provided with a through groove, and the inner wall of the inner side of the pressing cylinder is provided with a pressing cylinder retaining shoulder; the bearing seat is positioned in the pressing cylinder, the bearing is arranged on the bearing seat, and the bearing is limited by the bearing seat and the pressing cylinder shoulder; the oil retainer is positioned at the inner side of the pressing cylinder, the end part of the inner side of the pressing cylinder is positioned at the outer end of the oil retainer, two L-shaped annular plates which are arranged along the axis are arranged in an inner cavity of the oil retainer, and the L-shaped annular plate at the outer side is provided with a notch; the outer wall of the oil deflector is provided with a flange, and an oil deflector through hole is formed in the flange; the limiting ring is positioned in the pressing cylinder and the oil deflector, the limiting ring is positioned between the bearing seat and the oil deflector, and the oil deflector disc is sleeved on the outer wall of the limiting ring.

Further, the pressing cylinder is circumferentially provided with an annular groove, the clamping ring is installed in the annular groove and located on the outer side of the bearing, the outer side of the bearing is limited by the clamping ring, and the inner side of the pressing cylinder is limited by a pressing cylinder retaining shoulder on the inner wall of the pressing cylinder.

Further, the outer wall of the oil retainer is provided with an oil retainer sealing groove, and the device sealing ring is arranged in the oil retainer sealing groove.

Mining dump truck drive wheel of electronic round, its characterized in that includes: wheel motor, wheel hub, hub reduction gear, the wheel motor includes: the device comprises a frame, a traction motor, a connecting sleeve, a driving shaft and a mechanical sealing device; an inner cavity which is consistent with the outer contour and is axially communicated is arranged in the frame, a frame annular wall is arranged in the inner cavity, a frame annular wall threaded hole is formed in the frame annular wall, and the frame annular wall threaded hole is connected with a bent connector; the traction motor is fixedly connected to the inner side of the rack, the driving shaft is positioned in the inner cavity, the end part of the inner side of the driving shaft is connected with a rotating shaft of the traction motor through a connecting sleeve, the wheel hub is rotatably connected to the outer side of the rack, the wheel edge reducer is fixed to the side part of the wheel hub, and the end part of the outer side of the driving shaft is connected with the power input end of the wheel edge reducer; the pressing plate, the oil retainer, the bearing seat and the limiting ring are sleeved on the driving shaft, the limiting ring and the bearing seat are in interference fit with the driving shaft, the transverse pressing ring is connected to the outer side end of the rack through a pressing bolt of the device, the outer side of the bearing seat is limited through a shaft shoulder on the driving shaft, and the inner side of the bearing seat is limited through a pressing barrel retaining shoulder on the inner wall of the pressing barrel; the outer wall of the oil deflector is fixed in the inner cavity, and the end part of the inner side of the pressure cylinder is positioned at the outer end of the oil deflector to limit the oil deflector; the limiting ring is positioned between the bearing seat and the oil retainer, the oil retainer disc is sleeved on the outer wall of the limiting ring, the edge of an inner hole of the oil retainer disc is pressed on the outer wall of the limiting ring, and the outer edge of the oil retainer disc is positioned outside the pressure barrel shoulder.

Preferably, the inner cavity outside the annular wall of the frame is provided with a retaining wall, the inner cavity outside the retaining wall is provided with an inner cavity shoulder, the outer wall of the frame between the retaining wall and the inner cavity shoulder is provided with a radial through hole, the retaining wall and the radial through hole are positioned on the same side, and the retaining wall is positioned on the lower part of the driving shaft; the flange of the outer wall of the oil retainer is pressed outside the inner cavity shoulder of the inner cavity, the outer wall of the driving shaft is sleeved with an oil retaining ring, and the oil retaining ring is positioned between the retaining wall and the inner cavity shoulder.

Preferably, the outer side end of the frame is provided with a sealing element fixing threaded hole, and the device pressing bolt penetrates through the pressing plate through hole to be connected to the sealing element fixing threaded hole.

Preferably, the shape of the rack is a hollow horn shape, and a plurality of rack connecting through holes, motor fixing threaded holes and threaded counter bores are arranged at the end part of the horn mouth; a motor fixing plate is arranged on the outer side wall of the traction motor, a motor fixing through hole is formed in the motor fixing plate, and a motor fixing bolt penetrates through the motor fixing through hole and is connected to the motor fixing threaded hole; the traction motor is positioned in the horn mouth, the front end of the traction motor is sleeved in the annular wall of the rack, the outer wall of the traction motor is provided with a motor fixing plate and a supporting plate, the supporting plate is positioned outside the motor fixing plate, the motor fixing plate is provided with a motor fixing through hole, and a fixing bolt penetrates through the motor fixing through hole and is connected to a motor fixing threaded hole; the supporting plate is annular and is provided with an end through hole and a plurality of supporting plate connecting through holes, the screw penetrates through the supporting plate connecting through holes to be connected to the threaded counter bore, and the connecting end is connected to the end through hole; the threaded hole of the annular wall of the rack is connected with the front end of the elbow connector, and a communicating pipe is connected between the rear end of the elbow connector and the connecting end.

Preferably, the rear end of the connecting sleeve is connected to the front end of the traction motor, and the rear end of the driving shaft is sleeved at the front end of the connecting sleeve; the inner wall of the connecting sleeve is provided with a first key groove, the rotating shaft of the traction motor is provided with a second key groove, the rear end of the driving shaft is provided with a third key groove, and the fixed keys are arranged in the first key groove, the second key groove and the third key groove to rigidly connect the rear end of the driving shaft with the rotating shaft of the traction motor.

Preferably, the hub is axially provided with a connecting cavity and a power cavity which are communicated, and the end part of the power cavity is provided with a power component fixing threaded hole; the connecting cavity is sleeved at the rear end of the rack, and an inner hub bearing and an outer hub bearing are arranged between the inner wall of the connecting cavity and the outer wall of the rack; a floating seal is arranged between the inner side of the connecting cavity and the frame; wheel hub outside terminal surface is provided with the wheel hub screw hole, and wheel reduction sets up in the wheel hub cavity in the wheel hub outside, and wheel reduction includes: the device comprises a sun wheel, a planet wheel, a gear ring, a planet carrier, a pin shaft, a planet wheel bearing, a speed reducer end cover, an end cover bolt, a pin shaft fixing bolt and a planet carrier fixing bolt; a plurality of planet carrier through holes are formed in the edge of the planet carrier, a central hole is formed in the middle of the planet carrier, a plurality of end cover fixing threaded holes are formed in the outer side of the central hole, and a plurality of pin shaft fixing through holes are formed between the end cover fixing threaded holes and the planet carrier through holes; a sun wheel cavity is arranged below a central hole in the inner side surface of the planet carrier, a pin shaft cavity is arranged below a pin shaft fixing through hole, a planet carrier fixing bolt penetrates through a planet carrier through hole to be connected to a hub threaded hole, and the planet carrier is fixed on the end surface of the outer side of the hub; the sun wheel is positioned in the sun wheel cavity, the sun wheel is rigidly connected with the driving shaft, the planet wheel bearing is arranged on the pin shaft, the planet wheel is arranged on the radial outer side of the planet wheel bearing, and the outer side end of the pin shaft is provided with a pin shaft thread counter bore; the pin shaft threaded counter bore is positioned on the inner side of the pin shaft fixing through hole, a pin shaft fixing bolt penetrates through the pin shaft fixing through hole and is connected to the pin shaft threaded counter bore, a pin shaft is fixed in a pin shaft cavity, and the planet wheel is positioned outside the pin shaft cavity and meshed with the sun wheel; the end cover of the speed reducer is provided with an end cover through hole, an end cover bolt penetrates through the end cover through hole to be connected with the end cover fixing threaded hole, and the end cover of the speed reducer is fixed at the central hole; the middle part of the gear ring is provided with a gear ring center hole, the inner wall of the outer side of the gear ring is provided with internal teeth, the gear ring is fixed at the end part of the outer side of the rack by utilizing the gear ring center hole, the outer edge of the pressing plate is pressed outside the gear ring center hole, the gear ring is fixed on the rack along the axial direction, the gear ring and the rack are integrally fixed, and the internal teeth are meshed with the planet wheel.

Preferably, a motor sealing ring is arranged between the front end of the traction motor and the annular wall of the frame, an oil deflector sealing groove is arranged on the outer wall of the oil deflector, the device sealing ring is arranged in the oil deflector sealing groove, and the device sealing ring is positioned between the inner cavity and the oil deflector; a planet carrier sealing ring is arranged between the end faces of the outer sides of the planet carrier and the hub 8, a speed reducer sealing gasket is arranged on the lower portion of the speed reducer end cover, and a pin shaft sealing ring is arranged between the outer wall of the pin shaft and the inner wall of the pin shaft cavity.

The utility model discloses technical effect includes:

the utility model discloses a mechanical seal device realizes that traction motor and traction motor's mechanical non-contact are sealed, makes traction motor and wheel reduction gear effectively keep apart, and simultaneously, mechanical seal device still possesses sealed chamber constant voltage effect, further improves sealing device's reliability.

The mechanical sealing device does not need to be frequently checked and maintained in the running process of the wheel motor, has excellent durability and reliability, and greatly prolongs the maintenance interval of the wheel motor.

Drawings

Fig. 1 is a schematic structural view of the middle electric wheel mining dump truck of the utility model;

FIG. 2 is a cross-sectional view of a drive wheel of the present invention;

fig. 3 is a cross-sectional view of the mechanical seal of the present invention;

FIG. 4 is a block diagram of a mechanical seal of the present invention;

fig. 5 is a schematic structural view of the middle press plate of the present invention;

fig. 6 is a front view of the oil deflector of the present invention;

FIG. 7 is a cross-sectional view taken along the line K-K;

fig. 8 is a cross-sectional view of the position of the stop collar and the bearing according to the present invention.

Detailed Description

The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce it.

As shown in fig. 1, it is a schematic structural diagram of the mining dump truck with medium electric wheels of the utility model.

The mining dump truck with electric wheels mainly comprises: the automobile front axle comprises a frame 1, a front axle 2, a rear axle 3, a carriage 4, a cab 5, wheels 6, wheel motors 7 and wheel hubs 8, wherein the front axle 2 and the rear axle are connected to the frame 1, the carriage 4 and the cab 5 are connected to the top of the frame 1, the carriage 4 is positioned at the rear part of the cab 5, and the frame 1 is supported by the front axle 2 and the rear axle 3; the wheel hubs 8 are mounted on two sides of the front axle 2 and the rear axle 3, and the dump truck usually uses the rear wheels as driving wheels, so that the wheel motors 7 are mounted on two sides of the rear axle 3 respectively, the wheel hubs 8 are mounted on the wheel motors 7, the wheels 6 are mounted on the wheel hubs 8, and the output torques of the two wheel motors 7 drive the wheels 6 and the wheel hubs 8 to rotate, so as to drive the electric wheel mining dump truck to travel.

In the following description, the side facing the traction motor 72 is the inside, and the side facing the hub reduction gear 9 is the outside.

As shown in fig. 2, the cross-sectional view of the driving wheel of the present invention is shown.

The driving wheel includes: wheel motor 7, wheel hub 8, hub reduction gear 9, wheel motor 7 includes: frame 71, traction motor 72, connecting sleeve 73, drive shaft 74, mechanical seal device 75. The traction motor 72 is fixedly connected to the inner side of the frame 71, the driving shaft 74 is positioned in the inner cavity of the frame 71, and the inner end part of the driving shaft is connected with the rotating shaft of the traction motor 72 by a connecting sleeve 73; the hub 8 is rotatably connected to the outer side of the frame 71, and the hub reduction gear 9 is fixed to the side of the hub 8; the outboard end of the drive shaft 74 is connected to the power input of the wheel reduction unit 9.

The frame 71 is fixedly installed at one side of the rear axle 3, and the frame 71 plays a role of supporting the wheel motor 7. The shape of the frame 71 is a hollow horn shape, the end part (inner end part) of the horn mouth part with larger diameter is provided with a plurality of frame connecting through holes, motor fixing threaded holes and threaded counter bores, and the end part of the outer side of the frame 71 is provided with a sealing element fixing threaded hole; one end of the frame 71 is fixed at one side of the rear axle 3 through a frame connecting through hole and a frame fixing bolt; an inner cavity which is axially communicated and is consistent with the outer contour is formed in the frame 71, a frame annular wall 711 is arranged in the inner cavity, two frame annular wall threaded holes 712 are formed in the frame annular wall 711, a retaining wall 713 is arranged in the inner cavity on the outer side of the frame annular wall 711, an inner cavity retaining shoulder 714 is arranged in the inner cavity on the outer side of the retaining wall 713, and a radial through hole 715 is formed in the outer wall of the frame 71 between the retaining wall 713 and the inner cavity retaining shoulder 714. The retaining wall 713 and the radial through hole 715 are located on the same side, and the retaining wall 713 is located below the drive shaft 74. The threaded hole 712 of the annular wall of the frame is connected (screwed) to the front end of the elbow 716, and a connection pipe 718 is connected between the rear end of the elbow 716 and the connection head 717.

A motor fixing plate is arranged on the outer side wall of the traction motor 72, a motor fixing through hole is formed in the motor fixing plate, and a motor fixing bolt 721 penetrates through the motor fixing through hole and is connected to the motor fixing threaded hole; the traction motor 72 is positioned in the bell mouth, the front end of the traction motor 72 is sleeved in the frame annular wall 711, and a motor sealing ring 722 is arranged between the front end of the traction motor 72 and the frame annular wall 711. A motor fixing plate 723 and a supporting plate 724 are arranged on the outer wall of the traction motor 72, the supporting plate 724 is positioned on the outer side of the motor fixing plate 723, a motor fixing through hole is formed in the motor fixing plate, and a fixing bolt 721 penetrates through the motor fixing through hole to be connected to a motor fixing threaded hole; the supporting plate 724 is annular and is provided with two end through holes and a plurality of supporting plate connecting through holes, the screw 725 penetrates through the supporting plate connecting through holes to be connected to the threaded counter bore, and the connecting end 717 is connected to the end through hole. The support plate 724 serves to seal the inner chamber by pressing against the inner wall of the inner chamber while fixedly attaching the tip 717.

The rear end of the connecting sleeve 73 is connected (in a threaded connection or welding manner) to the front end of the traction motor 72, and the rear end of the driving shaft 74 is sleeved at the front end of the connecting sleeve 73; the rear end of the driving shaft 74 is rigidly connected with the rotating shaft of the traction motor 72, and the front end of the driving shaft 74 passes through the inner cavity and is rigidly connected with the power input end of the wheel-side reducer 9; an oil baffle ring 741 is sleeved on the outer wall of the driving shaft 74, and the oil baffle ring 741 is located between the retaining wall 713 and the inner cavity shoulder 714. In the preferred embodiment, the connecting sleeve 73 is axially provided with a large cavity and a small cavity which are communicated with each other, the large cavity is connected (threaded or welded) to the front end of the traction motor 72, and the rear end of the driving shaft 74 is sleeved in the small cavity. The inner wall of the connecting sleeve 73 is provided with a first key groove, the rotating shaft of the traction motor 72 is provided with a second key groove, the rear end of the driving shaft 74 is provided with a third key groove, and the fixed keys are arranged in the first key groove, the second key groove and the third key groove to rigidly connect the rear end of the driving shaft 74 and the rotating shaft of the traction motor 72.

Fig. 3 is a cross-sectional view of the mechanical seal device 75 of the present invention; as shown in fig. 4, it is a structural diagram of the mechanical sealing device 75 of the present invention; as shown in fig. 5, the structure of the pressing plate 751 of the present invention is schematically illustrated.

The mechanical sealing device 75 is positioned between the traction motor 72 and the wheel-side reducer 9, and the mechanical sealing device 75 is fixed on the outer side of the frame 71. A mechanical seal 75 fits over the drive shaft 74 to provide a reliable support for the drive shaft while providing a seal. The mechanical seal device 75 includes: the device comprises a pressing plate 751, an oil stopper 752, a bearing seat 753, a bearing 754, a clamping ring 755, an oil baffle disc 756, a limiting ring 757, a device sealing ring 758 and a device pressing bolt 759; the pressing plate 751 includes: the pressing device comprises a transverse pressing ring 7511 and a pressing cylinder 7512, wherein the top of the pressing cylinder 7512 is connected to the middle of the transverse pressing ring 7511, the transverse pressing ring 7511 is provided with a plurality of pressing plate through holes 7513, the pressing cylinder 7512 is axially provided with a pressing cylinder through hole 7514, the inner wall of the pressing cylinder 7512 is axially provided with a through groove 7515, an annular groove 7516 is circumferentially arranged, and the inner side of the pressing cylinder is provided with a pressing cylinder blocking shoulder; a pressing plate 751, an oil stopper 752, a bearing seat 753 and a limiting ring 757 are sleeved on the driving shaft 74, the bearing seat 753 and the limiting ring 757 are fixed on the driving shaft 74, a transverse pressing ring 7511 is positioned at the outer side end of the frame 71, and a device pressing bolt 759 penetrates through a pressing plate through hole 7513 to be connected to a sealing element fixing threaded hole; the bearing seat 753 is positioned in the pressing barrel 7512, the outer side of the bearing seat 753 is limited by a shaft shoulder on the driving shaft 74, the bearing 754 is installed on the bearing seat 753, the snap ring 755 is installed in the annular groove 7516, the snap ring 755 is positioned on the outer side of the bearing 754, the outer side of the bearing 754 is limited by the snap ring 755, and the inner side of the bearing 754 is limited by a pressing barrel shoulder on the inner wall of the pressing barrel 7512; the oil deflector 752 is positioned in the inner cavity of the frame 71, the flange of the outer wall is positioned outside the inner cavity shoulder 714, the flange is pressed outside the inner cavity shoulder 714, and the end part of the inner side of the pressing cylinder 7512 is positioned at the outer end of the oil deflector 752 to limit the oil deflector 752; the limiting ring 757 is positioned between the bearing seat 753 and the oil stopper 752, the oil baffle disc 756 is sleeved on the outer wall of the limiting ring 757, the edge of an inner hole of the oil baffle disc 756 is pressed on the outer wall of the limiting ring 757, and the outer edge of the oil baffle disc 756 is positioned on the outer side of the pressing cylinder blocking shoulder.

As shown in fig. 6, is a front view of the oil deflector 752 according to the present invention; FIG. 7 is a cross-sectional view taken along the direction K-K.

The cavity in the oil stopper 752 is provided with two L-shaped ring plates 7521 arranged along the axis, the inner side of the L-shaped ring plate 7521 is provided with a curled edge, and the L-shaped ring plate 7521 on the outer side is provided with a notch 7522; an oil deflector through hole 7523 is provided at the flange of the oil deflector 752. An oil deflector sealing groove 7524 is formed in the outer wall of the oil deflector 752, a device sealing ring 758 is installed in the oil deflector sealing groove 7524, and the device sealing ring 758 is located between the inner cavity and the oil deflector 752.

The windage tray 756 is an elastic member, and the edge of the inner hole extrudes the outer wall of the limit ring 757 after being subjected to oil pressure, thereby playing a role of sealing. The windage tray 756 is located inside the press drum 7512, and the windage tray 756 is an annular thin disk extending in the circumferential direction, has an approximately L-shaped longitudinal section, and is malleable.

The bearing seat 753 further supports the drive shaft 74 to prevent excessive deflection deformation of the drive shaft 74 at the center while maintaining the drive shaft 74 and the deflector 752 in uniform circumferential clearance. The snap ring 755 is in contact with the outer race of the bearing 754 to fix the outer race to the pressure plate 751, and indirectly to fix the windage tray 756 to the pressure plate 751 and the bearing 754.

The oil deflector 741 is provided on the drive shaft 74 above the radial through hole 715. The oil deflector 741 is made of rubber and is fixed to the drive shaft 74 integrally by elastic force generated by elastic deformation.

As shown in fig. 8, a cross-sectional view of the stop ring 757 and the bearing 754 of the present invention is shown.

The limiting ring 757 and the bearing seat 753 are in interference fit with the driving shaft 74, the end face of the outer side of the limiting ring 757 is in contact with the bearing inner ring of the bearing 754, the fixing of the bearing inner ring and the bearing seat 753 is achieved, and the fixing of the bearing seat 753 and the driving shaft 74 is achieved indirectly. The limiting ring 757 has an L-shaped cross section passing through the central axis, and an arc-shaped groove 7571 is arranged on the outer side surface.

The hub 8 is rotatably connected to the rack 71, the hub 8 is axially provided with a connecting cavity and a power cavity which are communicated, and the end part of the power cavity is provided with a power component fixing threaded hole; the connecting cavity is sleeved at the rear end of the frame 71, an inner hub bearing 81 and an outer hub bearing 82 are arranged between the inner wall of the connecting cavity and the outer wall of the frame 71, and the hub 8 can be rotatably connected around the frame 71 through the inner hub bearing 81 and the outer hub bearing 82. A floating seal 83 is arranged between the inner side of the connecting cavity and the frame 71. In the preferred embodiment, the inner hub bearing 81 and the outer hub bearing 82 are single row tapered roller bearings.

The wheel reduction gear 9 is a planetary gear mechanism, and in the present embodiment, the wheel reduction gear 9 is described by taking a single-stage NGW type planetary gear mechanism as an example, but in actual application, the wheel reduction gear 9 includes, but is not limited to, a single-stage NGW type planetary gear mechanism. The hub reduction gear 9 is arranged in a hub cavity on the outer side of the hub 8, and a hub threaded hole is formed in the end face of the outer side of the hub 8.

The hub reduction gear 9 includes: sun gear 901, planet wheel 902, ring gear 903, planet carrier 904, pin 905, planet wheel bearing 906, reducer end cover 907, end cover bolt 909, pin fixing bolt 912, and planet carrier fixing bolt 913.

A plurality of planet carrier through holes are formed in the planet carrier 904 close to the edge, a central hole is formed in the middle of the planet carrier 904, a plurality of end cover fixing threaded holes are formed in the outer side of the central hole, and a plurality of pin shaft fixing through holes are formed between the end cover fixing threaded holes and the planet carrier through holes; a sun wheel cavity is arranged below a central hole in the inner side surface of the planet carrier 904, a pin shaft cavity is arranged below a pin shaft fixing through hole, a planet carrier fixing bolt 913 penetrates through a planet carrier through hole to be connected to a hub threaded hole, and the planet carrier 904 is fixed on the end surface of the outer side of the hub 8; the sun gear 901 is positioned in a sun gear cavity, the sun gear 901 is rigidly connected with the driving shaft 74, the planet gear bearing 906 is arranged on the pin shaft 905, the planet gear 902 is arranged on the outer side of the planet gear bearing 906, and the outer side end of the pin shaft 905 is provided with a pin shaft thread counter bore; the pin shaft thread counter bore is positioned at the inner side of the pin shaft fixing through hole, a pin shaft fixing bolt 912 passes through the pin shaft fixing through hole and is connected to the pin shaft thread counter bore, a pin shaft 905 is fixed in a pin shaft cavity, and a planet wheel 902 is positioned outside the pin shaft cavity and meshed with a sun wheel 901; an end cover through hole is formed in the speed reducer end cover 907, an end cover bolt 909 penetrates through the end cover through hole to be connected to the end cover fixing threaded hole, and the speed reducer end cover 907 is fixed at the central hole; the middle of the gear ring 903 is provided with a gear ring center hole, the inner wall of the outer side of the gear ring 903 is provided with inner teeth, the gear ring 903 is fixed at the outer end of the rack 71 through the gear ring center hole, the outer edge of the pressing plate 751 presses the outer side of the gear ring center hole to fix the gear ring 903 on the rack 71 along the axial direction, the gear ring 903 and the rack 2 are integrally fixed, and the inner teeth are meshed with the planet gear 902.

The sun wheel 901 is positioned on the inside by the shoulder of the drive shaft 74 and on the outside axially fixed by means of a retaining ring 910. The outer end of the driving shaft 74 is provided with an annular groove, and the retainer ring 910 is installed in the annular groove to position the sun gear 901 and prevent the sun gear 901 and the driving shaft 74 from moving axially.

A planet carrier sealing ring 913 is arranged between the outer side end faces of the planet carrier 904 and the hub 8, a speed reducer sealing gasket 908 is arranged at the lower part of the speed reducer end cover 907, and a pin shaft sealing ring 911 is arranged between the outer wall of the pin shaft 905 and the inner wall of the pin shaft cavity.

The plurality of planet wheels 902 are uniformly arranged around the sun wheel 901, and the axes of the planet wheels 902, the sun wheel 901, the pin 905 and the gear ring 903 are parallel.

Fixed key grooves are respectively formed in the central hole of the gear ring and the outer wall of the outer end of the rack 71, splines are arranged in the fixed key grooves, and the gear ring 903 and the rack 2 are integrally fixed through the splines.

The lubricant level W is a lubricant level height on the side of the hub reduction gear 9, and is lower than the center axis of the drive shaft 74 and between the frame 71 and the inner surface of the hub 8. The lubricating oil level W is the level position after the lubricating oil is correctly filled according to the specification.

The first space S1 is a closed space surrounded by the frame 71, the hub 8, the floating seal 83, the mechanical seal device 75, and the hub reduction gear 9. The lubricating oil is filled in the first space S1, i.e., the first space S1 is a working space for the lubricating oil.

The second space S2 is a closed space surrounded by the frame 71, the frame annular wall 711, the traction motor 72, the connection sleeve 73, the driving shaft 74 and the mechanical sealing device 75.

The wheel motor 7 works according to the principle: when the dump truck operates, the traction motor 72 of the wheel motor 7 drives the driving shaft 74 to rotate at a high speed through the connecting sleeve 73, the driving shaft 74 drives the sun gear 901 to rotate simultaneously, the gear ring 903 and the rack 71 in the wheel-side reducer 9 do not rotate, the sun gear 901 drives the planet gear 902 to rotate around the pin 905, under the combined action of the sun gear 901 and the gear ring 903, the planet gear 902 drives the planet carrier 904 to rotate, and the planet carrier 904 drives the hub 8 to rotate. The hub 8 drives the wheels 6 mounted thereon, which in turn drive the dump truck forward.

During operation, the drive shaft 74 and sun gear 901 rotate at speeds up to thousands of revolutions per minute. The lower part of the closed first space S1 is filled with lubricating oil having a liquid level W. In the rotation process of the planet wheel 902, gear oil is driven, and then splash lubrication of the whole hub reduction gear 9 is achieved. The splashed lubricating oil enters the pressure tube 7512, and the bearing 754 is lubricated. The splashed lubricating oil passes through the gaps between the balls of the bearings 754, and the windage tray 756 provided inside the bearings 754 provides resistance to the lubricating oil flowing into the inside, preventing the lubricating oil from excessively flowing into the inside of the bearings 754.

When the lubricant oil flows into the region between the oil baffle 756 and the stopper ring 757, since the stopper ring 757 has an inner outer diameter larger than an outer diameter and an inner outer circumferential surface provided with the arc groove 7571, since the stopper ring 757 is fixedly connected to the drive shaft 74, the rotation speed of the stopper ring 757 is as high as thousands of revolutions per minute, and the lubricant oil flows into the outer circumferential region where the arc groove 7571 is located, the lubricant oil is thrown out onto the inner surface of the oil deflector 752 by the centrifugal force. The lubricating oil thrown against the inner surface of the oil deflector 752 flows and collects along the inner surface of the oil deflector 752, and the lubricating oil is collected below the oil deflector 752 by the blocking action of the two L-shaped ring plates 7521 of the oil deflector 752, flows outward through the slits 7522 and the through grooves 7515 of the pressure plate 751, and flows back to the first space S1.

After passing over the stop ring 757, not all of the oil is thrown against the inner surface of the oil deflector 752, and a small amount of oil continues to flow inwardly along the surface of the drive shaft 74 into the second space S2. When the lubricant flows to the oil retainer 741 along the surface of the driving shaft 74, the lubricant is subjected to centrifugal force again when flowing through the outer surface of the oil retainer 741 under the action of the oil retainer 741, and is thrown out of the inner cavity wall between the retaining wall 713 and the inner cavity shoulder 714. The lubricant oil flows to the lowest part of the cavity along the cavity wall surface of the frame 71, and the lubricant oil cannot flow inward any more under the block of the blocking wall 713, and the lubricant oil flows back to the first space S1 again through the radial through hole 715. By the above components, most of the lubricant oil leaking from the first space S1 is blocked and flows back into the first space S1 again.

Only very little oil drops or oil mist enters the inner side of the second space S2 by crossing the retaining wall 713, gathers and flows to the lower part of the inner cavity of the frame 71 again, and flows out along the threaded hole 712 of the annular wall of the frame, the bent connector 716, the communicating pipe 718 and the connecting end 717; the connecting head 717 is connected to a reservoir mounted in the rear axle 3 through a pipe, and the lubricating oil flows out through the connecting head 717 and collects in the reservoir, and the reservoir is periodically checked.

The constant pressure action of the mechanical seal device 75 is explained below.

The first space S1 is communicated with the second space S2 through the cylinder pressing through hole 7514 and the oil deflector through hole 7523, and the second space S2 is communicated with the outside through the frame annular wall threaded hole 712, the bent connector 716, the communicating pipe 718 and the connecting end 717. When the wheel motor 7 is in operation, lubricating oil is filled below the first space S1 of the wheel motor 7, the remaining part is air, and the lubricating oil level W is lower than the central axis of the drive shaft 74; the sun gear 901 and the planet gear 902 of the hub reduction gear 9 rotate at high speed, so that the temperature in the first space S1 is increased and the air pressure is increased. Because the first space S1 is communicated with the second space S2 and further communicated with the outside, high-pressure gas in the first space S1 can be discharged through the channel, so that the air pressure of the first space S1 and the air pressure of the second space S2 are reduced, and oil leakage caused by overhigh air pressure is prevented.

When the air pressure in the first space S1 is low, the external air can enter the first space S1 through the above-mentioned passage, so as to further keep the air pressure in the first space S1 constant. Since the fluid level W is much lower than the housing annular wall threaded hole 712 and the housing annular wall threaded hole 712 has a small diameter, it is difficult for the lubricant to leak along the hole. Therefore, the constant pressure action does not cause leakage of the lubricating oil.

According to the driving wheel of the scheme, mechanical non-contact sealing is adopted, so that abrasion and failure caused by using contact sealing are effectively avoided. In the operation process, leaked lubricating oil is reasonably blocked and flows back to the initial oil cavity, the lubricating oil is effectively prevented from leaking to one side of the traction motor 72, the wheel-side speed reducer 9 and the traction motor 72 can be effectively isolated, and the durability and the reliability are excellent. Moreover, according to the scheme, the oil leakage can be avoided, meanwhile, the outside and the high-pressure cavity in the wheel motor 7 can be effectively communicated, and the oil leakage caused by the failure of the sealing ring due to high pressure is further reduced.

The terminology used herein is for the purpose of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (10)

1. A mechanical seal, comprising: clamp plate, oil baffle ware, bearing frame, bearing, oil baffle dish, spacing ring, device housing bolt, the clamp plate includes: the device comprises a transverse compression ring and a compression cylinder, wherein the top of the compression cylinder is connected to the middle of the transverse compression ring, the transverse compression ring is provided with a plurality of compression plate through holes, and compression bolts of the device are arranged in the compression plate through holes; the pressing cylinder is axially provided with a pressing cylinder through hole, the inner wall of the pressing cylinder is axially provided with a through groove, and the inner wall of the inner side of the pressing cylinder is provided with a pressing cylinder retaining shoulder; the bearing seat is positioned in the pressing cylinder, the bearing is arranged on the bearing seat, and the bearing is limited by the bearing seat and the pressing cylinder shoulder; the oil retainer is positioned at the inner side of the pressing cylinder, the end part of the inner side of the pressing cylinder is positioned at the outer end of the oil retainer, two L-shaped annular plates which are arranged along the axis are arranged in an inner cavity of the oil retainer, and the L-shaped annular plate at the outer side is provided with a notch; the outer wall of the oil deflector is provided with a flange, and an oil deflector through hole is formed in the flange; the limiting ring is positioned between the bearing seat and the oil baffle, and the oil baffle disc is sleeved on the outer wall of the limiting ring.

2. The mechanical seal device according to claim 1, wherein the pressing cylinder is circumferentially provided with an annular groove, the snap ring is installed in the annular groove, the snap ring is positioned outside the bearing, the outside of the bearing is limited by the snap ring, and the inside is limited by a pressing cylinder shoulder on the inner wall of the pressing cylinder.

3. The mechanical seal device according to claim 1, wherein an outer wall of the oil deflector is provided with an oil deflector seal groove, and the device seal ring is installed in the oil deflector seal groove.

4. The driving wheel of the electric wheel mining dump truck using the mechanical seal device according to any one of claims 1 to 3, characterized by comprising: wheel motor, wheel hub, hub reduction gear, the wheel motor includes: the device comprises a rack, a traction motor, a connecting sleeve, a driving shaft and a mechanical sealing device; an inner cavity which is consistent with the outer contour and is axially communicated is arranged in the frame, a frame annular wall is arranged in the inner cavity, a frame annular wall threaded hole is formed in the frame annular wall, and the frame annular wall threaded hole is connected with a bent connector; the traction motor is fixedly connected to the inner side of the rack, the driving shaft is positioned in the inner cavity, the end part of the inner side of the driving shaft is connected with a rotating shaft of the traction motor through a connecting sleeve, the wheel hub is rotatably connected to the outer side of the rack, the wheel edge reducer is fixed to the side part of the wheel hub, and the end part of the outer side of the driving shaft is connected with the power input end of the wheel edge reducer; the pressing plate, the oil retainer, the bearing seat and the limiting ring are sleeved on the driving shaft, the limiting ring and the bearing seat are in interference fit with the driving shaft, the transverse pressing ring is connected to the outer side end of the rack through a pressing bolt of the device, the outer side of the bearing seat is limited through a shaft shoulder on the driving shaft, and the inner side of the bearing seat is limited through a pressing barrel retaining shoulder on the inner wall of the pressing barrel; the outer wall of the oil deflector is fixed in the inner cavity, and the end part of the inner side of the pressure cylinder is positioned at the outer end of the oil deflector to limit the oil deflector; the limiting ring is positioned between the bearing seat and the oil baffle, the oil baffle disc is sleeved on the outer wall of the limiting ring, the edge of an inner hole of the oil baffle disc is pressed on the outer wall of the limiting ring, and the outer edge of the oil baffle disc is positioned on the outer side of the pressing barrel shoulder.

5. The driving wheel of the mining dump truck with electric wheels as claimed in claim 4, wherein the inner cavity outside the annular wall of the frame is provided with a retaining wall, the inner cavity outside the retaining wall is provided with an inner cavity shoulder, the outer wall of the frame between the retaining wall and the inner cavity shoulder is provided with a radial through hole, the retaining wall and the radial through hole are located on the same side, and the retaining wall is located on the lower part of the driving shaft; the flange of the outer wall of the oil retainer is pressed outside the inner cavity shoulder of the inner cavity, the outer wall of the driving shaft is sleeved with an oil retaining ring, and the oil retaining ring is positioned between the retaining wall and the inner cavity shoulder.

6. The driving wheel for the mining dump truck with the electric wheels as defined in claim 4, wherein the outer end of the frame is provided with a threaded hole for fixing the sealing member, and the device pressing bolt passes through the through hole of the pressing plate to be connected to the threaded hole for fixing the sealing member.

7. The driving wheel of the mining dump truck with the electric wheels as claimed in claim 4, wherein the shape of the frame is a hollow horn shape, and a plurality of frame connecting through holes, motor fixing threaded holes and threaded counter bores are arranged at the end part of the horn shape; a motor fixing plate is arranged on the outer side wall of the traction motor, a motor fixing through hole is formed in the motor fixing plate, and a motor fixing bolt penetrates through the motor fixing through hole and is connected to the motor fixing threaded hole; the traction motor is positioned in the bell mouth, the front end of the traction motor is sleeved in the annular wall of the rack, the outer wall of the traction motor is provided with a motor fixing plate and a supporting plate, the supporting plate is positioned outside the motor fixing plate, the motor fixing plate is provided with a motor fixing through hole, and a fixing bolt penetrates through the motor fixing through hole and is connected to a motor fixing threaded hole; the supporting plate is annular and is provided with an end through hole and a plurality of supporting plate connecting through holes, the screw penetrates through the supporting plate connecting through holes to be connected to the threaded counter bore, and the connecting end is connected to the end through hole; the threaded hole of the annular wall of the rack is connected with the front end of the elbow connector, and a communicating pipe is connected between the rear end of the elbow connector and the connecting end.

8. The driving wheel of the mining dump truck with the electric wheels as defined in claim 4, wherein the rear end of the connecting sleeve is connected to the front end of the traction motor, and the rear end of the driving shaft is sleeved on the front end of the connecting sleeve; the inner wall of the connecting sleeve is provided with a first key groove, the rotating shaft of the traction motor is provided with a second key groove, the rear end of the driving shaft is provided with a third key groove, and the fixed keys are arranged in the first key groove, the second key groove and the third key groove to rigidly connect the rear end of the driving shaft with the rotating shaft of the traction motor.

9. The driving wheel of the mining dump truck with the electric wheels as claimed in claim 4, wherein the hub is axially provided with a connecting cavity and a power cavity which are communicated with each other, and the end part of the power cavity is provided with a power part fixing threaded hole; the connecting cavity is sleeved at the rear end of the rack, and an inner hub bearing and an outer hub bearing are arranged between the inner wall of the connecting cavity and the outer wall of the rack; a floating seal is arranged between the inner side of the connecting cavity and the frame; wheel hub outside terminal surface is provided with the wheel hub screw hole, and wheel reduction sets up in the wheel hub cavity in the wheel hub outside, and wheel reduction includes: the device comprises a sun wheel, a planet wheel, a gear ring, a planet carrier, a pin shaft, a planet wheel bearing, a speed reducer end cover, an end cover bolt, a pin shaft fixing bolt and a planet carrier fixing bolt; a plurality of planet carrier through holes are formed in the edge of the planet carrier, a central hole is formed in the middle of the planet carrier, a plurality of end cover fixing threaded holes are formed in the outer side of the central hole, and a plurality of pin shaft fixing through holes are formed between the end cover fixing threaded holes and the planet carrier through holes; a sun wheel cavity is arranged below a central hole in the inner side surface of the planet carrier, a pin shaft cavity is arranged below a pin shaft fixing through hole, a planet carrier fixing bolt penetrates through a planet carrier through hole to be connected to a hub threaded hole, and the planet carrier is fixed on the end surface of the outer side of the hub; the sun wheel is positioned in the sun wheel cavity, the sun wheel is rigidly connected with the driving shaft, the planet wheel bearing is arranged on the pin shaft, the planet wheel is arranged on the radial outer side of the planet wheel bearing, and the outer side end of the pin shaft is provided with a pin shaft thread counter bore; the pin shaft threaded counter bore is positioned on the inner side of the pin shaft fixing through hole, the pin shaft fixing bolt penetrates through the pin shaft fixing through hole and is connected to the pin shaft threaded counter bore, the pin shaft is fixed in the pin shaft cavity, and the planet wheel is positioned outside the pin shaft cavity and meshed with the sun wheel; the end cover of the speed reducer is provided with an end cover through hole, an end cover bolt penetrates through the end cover through hole to be connected with the end cover fixing threaded hole, and the end cover of the speed reducer is fixed at the central hole; the middle part of the gear ring is provided with a gear ring center hole, the inner wall of the outer side of the gear ring is provided with internal teeth, the gear ring is fixed at the end part of the outer side of the rack by utilizing the gear ring center hole, the outer edge of the pressing plate is pressed outside the gear ring center hole, the gear ring is fixed on the rack along the axial direction, the gear ring and the rack are integrally fixed, and the internal teeth are meshed with the planet wheel.

10. The driving wheel of the mining dump truck with the electric wheels as recited in claim 9, wherein a motor sealing ring is disposed between the front end of the traction motor and the annular wall of the frame, an oil deflector sealing groove is disposed on the outer wall of the oil deflector, the device sealing ring is installed in the oil deflector sealing groove, and the device sealing ring is located between the inner cavity and the oil deflector; a planet carrier sealing ring is arranged between the end faces of the outer sides of the planet carrier and the hub 8, a speed reducer sealing gasket is arranged on the lower portion of the speed reducer end cover, and a pin shaft sealing ring is arranged between the outer wall of the pin shaft and the inner wall of the pin shaft cavity.

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