CN214267351U - Middle axle assembly of electric muck truck - Google Patents

Abstract

The utility model discloses an electric muck vehicle middle axle assembly, which comprises a main reducer with a differential assembly, a middle axle housing assembly, a brake assembly, a hub assembly, a wheel hub reducer assembly, a brake drum, a left half axle, a right half axle, a brake camshaft, a camshaft bracket, a brake clearance adjusting arm, a brake chamber and a brake chamber bracket; the main speed reducer with the differential assembly, the brake assembly, the camshaft bracket and the brake air chamber bracket are respectively arranged on the middle axle housing assembly through bolts; and the left half shaft and the right half shaft respectively penetrate through the left end and the right end of the shell of the middle axle housing assembly, one end of the left half shaft and the right half shaft is connected with the main speed reducer assembly with the differential mechanism, and the other end of the left half shaft and the right half shaft is connected with the wheel-side speed reducer assembly. The utility model discloses simple structure, impact resistance is high, and trafficability characteristic is good.

Description

Middle axle assembly of electric muck truck

Technical Field

The utility model relates to a drive axle assembly of vehicle drive line, concretely relates to axle assembly in electronic dregs car.

Background

The muck truck, commonly known as a mud head truck, is widely used in foundation construction sites, and is mainly used for earthwork transportation. The muck truck basically runs on a non-paved road surface under heavy load, and has severe working conditions, and requires large power and high trafficability of the whole truck. The existing muck vehicle with a chassis of 6 multiplied by 4 or 8 multiplied by 4 and basically a common diesel engine in power configuration has the defects of high oil consumption, high air pollution, high noise and the like, along with the development of domestic new energy sources, particularly pure electric drive technology, the problems of air pollution and noise can be effectively solved by electric drive, the electrically driven muck vehicle has wide market prospect, but the electric drive has short power output response time, has large impact influence on gears in a drive axle assembly, and requires high impact resistance of drive axle gears, particularly driving and driven gears, and the existing drive axle for diesel power is difficult to meet the requirements.

In addition, the muck vehicle is usually driven in muddy, soft or no-road areas because the muck vehicle is used in a non-paved road surface; the existing muck truck has the phenomenon that when the existing muck truck is stopped and starts again, the existing muck truck cannot be separated from the trapped situation and cannot continue to run due to the fact that a single wheel slips to cause driving force loss.

SUMMERY OF THE UTILITY MODEL

The utility model provides an axle assembly in electronic dregs car that simple structure, impact resistance is high, trafficability characteristic is good to the special operation requirement and the use operating mode of pure electric drive dregs car to the transaxle.

The utility model adopts the technical proposal that:

a middle axle assembly of an electric muck truck comprises a main speed reducer assembly with a differential mechanism, a middle axle housing assembly, a brake assembly, a hub speed reducer assembly, a brake drum, a left half axle, a right half axle, a brake cam shaft, a cam shaft bracket, a brake gap adjusting arm, a brake air chamber and a brake air chamber bracket; the main speed reducer with the differential assembly, the brake assembly, the camshaft bracket and the brake air chamber bracket are respectively arranged on the middle axle housing assembly through bolts; the left half shaft and the right half shaft respectively penetrate through the left end and the right end of a shell of the middle axle shell assembly, one end of the left half shaft and the right half shaft is connected with a main speed reducer assembly with a differential mechanism, and the other end of the left half shaft and the right half shaft is connected with a wheel-side speed reducer assembly; the brake drum is sleeved at the rear end of a hub reduction gear shell of the hub reduction gear assembly, and the brake assembly and the rear wheel hub assembly are arranged in the brake drum and the hub reduction gear shell; one end of the brake camshaft is connected with the brake assembly, and the other end of the brake camshaft is connected with the camshaft bracket; the brake chamber is fixed on the brake chamber bracket, and the front end of the brake chamber is rotationally connected with the brake clearance adjusting arm.

Further, the main speed reducer with differential assembly comprises an interaxle differential assembly, a main speed reducer shell, a gap bridge box body cover, a driving gear, a driven gear, a driving cylindrical gear, a driven cylindrical gear, a hollow shaft and a through shaft; the main speed reducer shell is installed on the middle axle housing assembly through bolts, the gap bridge box body is installed at the opening end of the main speed reducer shell through bolts, and the gap bridge box body cover is installed on the gap bridge box body through bolts and used for closing the gap bridge box body; the inter-axle differential assembly is rotatably arranged in a space surrounded by the gap bridge box body and the gap bridge box body cover through a bearing; one end of the hollow shaft penetrates through the driving cylindrical gear and is rotatably arranged in the gap bridge box body, and the other end of the hollow shaft extends into the inter-axle differential assembly and is fixedly connected with a rear half-shaft gear of the inter-axle differential assembly; the driving cylindrical gear is connected with an external spline of the hollow shaft through an internal spline; one end of the through shaft penetrates through the main speed reducer shell and can be rotatably arranged on the main speed reducer shell, and the other end of the through shaft penetrates through the hollow shaft and extends into the inter-axle differential assembly to be connected with the front half axle gear through a spline; the inter-wheel differential assembly is rotatably arranged in a main speed reducer shell through a bearing, a driven gear is fixed on the inter-wheel differential assembly through a bolt, a driving gear is rotatably arranged in the main speed reducer shell through a bearing, and the driving gear is meshed with the driven gear; and the driven cylindrical gear is fixedly sleeved on the driving gear shaft through a spline, and the driven cylindrical gear is meshed with the driving cylindrical gear.

Furthermore, an inter-wheel forced locking antiskid differential lock device is arranged between the left half shaft and the inter-wheel differential assembly, and mainly comprises a fixed meshing sleeve, a sliding meshing sleeve, a first sliding block, a first shifting fork shaft and a first cylinder; the fixed meshing sleeve is in meshed connection with an external spline on a left differential shell of the inter-wheel differential assembly through an internal spline, and the sliding meshing sleeve is in meshed connection with an external spline of a left half shaft through an internal spline; the fixed meshing sleeve is meshed and matched with the sliding meshing sleeve; one end of the first sliding block is inserted into the first shifting fork hole, and the other end of the first sliding block is clamped into the annular groove of the sliding meshing sleeve; one end of the first shifting fork shaft penetrates through the middle axle housing assembly and is inserted into a spline groove of the first shifting fork; the rear end of the first shifting fork shaft is connected with a piston rod head of a first cylinder, and the other end of the cylinder body of the first cylinder is fixed on the middle axle housing assembly through a screw rod.

Furthermore, the outer side of the fixed meshing sleeve is sequentially provided with a locking plate and an outer round nut, and the locking plate and the outer round nut are used for locking the fixed meshing sleeve.

Furthermore, an interaxial forced locking antiskid differential lock device is arranged on the interaxial differential assembly, and mainly comprises a differential lock ring, a differential lock pin, a second slide block, a second shifting fork shaft and a second cylinder; one end of the differential lock pin is clamped into the circular arc-shaped clamping groove of the differential lock ring and then inserted into a differential lock pin mounting hole of a front interaxle differential case of the interaxle differential assembly; one end of the second sliding block is inserted into the second shifting fork hole, and the other end of the second sliding block is clamped into the ring groove of the differential locking ring; one end of the second shifting fork shaft penetrates through a corresponding mounting hole in the gap bridge box cover to be inserted into a spline groove of the second shifting fork, the other end of the second shifting fork shaft is connected with a second cylinder piston rod head, and the other end of the second cylinder body is fixed on the gap bridge box cover through a screw.

Furthermore, the hub reduction gear assembly comprises a planetary gear shaft, a hub planetary gear, a sun gear, a planetary gear carrier mounting bolt, a hub reduction gear shell, a gear ring, an elastic retainer ring and a gear ring support; the hub reduction gear is characterized in that a hub reduction gear shell is arranged on the front side of a rear hub through wheel bolts, one end of a planet wheel shaft is press-fitted on the hub reduction gear shell in an interference fit manner, a hub planet wheel is arranged on the planet wheel shaft in a rolling manner, a mounting hole of a planet wheel carrier is in clearance fit with the other end of the planet wheel shaft and is arranged in the hub reduction gear shell through a mounting bolt of the planet wheel carrier, a sun wheel is arranged at the end parts of a left half shaft and a right half shaft through splines, and the hub planet wheel is meshed with the sun wheel; the gear ring support is arranged at the end part of the middle axle housing assembly, is connected with the outer bearing of the wheel hub in an interference fit manner and is locked and positioned through a locking nut; the gear ring is arranged on the gear ring bracket through an internal spline and is fixed by an elastic retainer ring; the gear ring is meshed with the wheel-side planet wheel.

Furthermore, one end of each of the left half shaft and the right half shaft is installed in a half shaft gear of the inter-wheel differential assembly through an external spline, and the other end of each of the left half shaft and the right half shaft is connected with a sun gear of the hub reduction gear assembly through a spline and fixes the sun gear through an elastic check ring.

Furthermore, the end parts of the left half shaft and the right half shaft are provided with half shaft limiting plugs, the half shaft limiting plugs are pressed on the end covers in an interference fit mode, and the end covers are installed on the hub reduction gear shell through bolts.

Furthermore, the rear wheel hub assembly comprises a wheel bolt, a rear wheel hub, a wheel hub inner bearing, an oil receiving cover, a wheel hub inner oil seal and a wheel hub outer bearing; the rear wheel hub is rotatably arranged at two ends of the middle axle housing assembly through the wheel hub inner bearing and the wheel hub outer bearing, and the wheel bolt is pressed on the rear wheel hub in an interference fit manner; the hub inner bearing and the hub outer bearing are respectively pressed in the rear hub through the outer ring in an interference fit manner, and the hub inner oil seal is pressed on the outer side of the hub inner bearing through the interference fit manner; the oil receiving cover is arranged on the outer side of the oil seal in the hub through a bolt.

Furthermore, the oil receiving cover is of a conical tubular structure with two open ends, the large end of the oil receiving cover is fixed at the rear end of the rear wheel hub through bolts, oil leakage holes are correspondingly formed in the rear wheel hub, the hub reduction gear shell and the brake drum, and the inner cavity of the oil receiving cover is communicated with the oil leakage holes.

The utility model has the advantages that:

1. in order to improve the trafficability of the middle axle assembly, the middle part of the middle axle assembly, namely the main speed reducer assembly with a differential mechanism, is required to have small outline dimension. This application sets up the intermediate axle assembly into second grade speed reduction structure, sets up the second grade speed reduction at the intermediate axle both ends, also is inside that the wheel reduction gear position is in the steel ring promptly, can make main reducer take differential mechanism assembly overall dimension to accomplish minimum like this, promotes the assembly trafficability characteristic.

2. The muck vehicle is usually driven in a muddy, soft or non-road area because the using environment of the muck vehicle is a non-paved road surface; when the vehicle is stopped due to the loss of driving force caused by the slippage of a single wheel, the vehicle can not be separated from the trapped situation and can not continuously run when being started again; in order to solve the problem, the anti-skid differential lock device for forced locking between wheels and the anti-skid differential lock device for forced locking between shafts are arranged in the middle axle assembly.

3. Because of oil blanket is quick-wear part in the wheel hub, and installs inside wheel hub, when the oil blanket damages and causes the oil leak in the wheel hub, from the outside can not directly discover, in the lubricating oil of seepage can flow into the brake drum, and then makes brake friction disc be infected with lubricating oil and arouse the braking inefficacy in the stopper assembly, for avoiding this problem to produce, this application is installed near main reducer area differential mechanism assembly one side direction at rear wheel hub and is connect the oil cover.

Drawings

Fig. 1 is a schematic view of the appearance structure of the middle axle assembly for the electric muck truck of the present invention.

Fig. 2 is a partial sectional view of fig. 1.

Fig. 3 is a schematic view of the mounting structure of the inter-wheel forced locking anti-slip differential lock device of the middle axle assembly for the electric muck truck of the present invention.

Fig. 4 is a schematic view of the installation structure of the inter-axle forced locking anti-slip differential lock device of the middle axle assembly for the electric muck truck of the present invention.

Description of the main part symbols:

1. the main speed reducer is provided with a differential assembly;

53. an inter-axle differential assembly; 54. a front inter-axle differential case; 59. a rear inter-axle differential case; 56. a front half-shaft gear; 57. A differential axis cross; 58. a shaft differential planet gear; 60. a rear half shaft gear;

84. an inter-wheel differential assembly; 83. a left differential case; 88. a right differential case; 87. a wheel differential planetary gear; 89. a half shaft gear; 86. a wheel differential spider;

61. a front flange lock nut; 62. a front flange; 63. a bearing seat; 64. an inter-axle differential outer bearing; 65. a gap bridge box cover; 66. a gap bridge box body; 67. an inter-axle differential inner bearing; 68. a driving cylindrical gear; 69. a hollow shaft; 70. a bearing is installed on the driving cylindrical gear; 71. a bearing cap; 72. a main gear bearing seat; 73. a main gear outer bearing unit; 74. a driving gear; 75. A driven cylindrical gear; 76. a main gear inner bearing; 77. a main reducer case; 79. a through-shaft support bearing; 80. a through shaft; 81. a rear flange lock nut; 82. a rear flange; 85. a driven gear; 90. an inter-wheel differential bearing; 91. an inter-wheel differential bearing adjusting nut;

2. a middle axle housing assembly;

3-1, a left half shaft;

3-2, right half-axis;

4. a brake assembly;

6. a brake drum;

10. a hub assembly;

11. a wheel bolt; 12. a hub; 8. a hub inner bearing; 9. an oil receiving cover; 7. an oil seal is arranged in the hub; 13. a hub outer bearing;

16. a hub reduction gear assembly;

17. a planetary wheel shaft; 18. a hub planet wheel; 19. a sun gear; 23. a planet carrier; 24. a planet wheel carrier mounting bolt; 25. A hub reduction gear case; 26. a ring gear; 27. a circlip; 14. a ring gear support;

28. braking the camshaft;

29. a brake chamber bracket;

30. a brake chamber;

31. a brake gap adjusting arm;

300. the antiskid differential lock device is forcibly locked among the wheels;

33. sliding the meshing sleeve; 36. fixing the meshing sleeve; 37. a first slider; 38. a first shift fork; 39. a first fork shaft; 40. a first cylinder;

400. the antiskid differential lock device is forcibly locked between the shafts;

45. a differential lock ring; 44. a differential lock pin; 46. a second slider; 47. a second fork; 48. a second fork shaft; 49. a second cylinder.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and a preferred embodiment.

Referring to fig. 1 and 2, the intermediate axle assembly mainly comprises a main reducer with differential assembly 1, an intermediate axle housing assembly 2, a brake assembly 4, a hub assembly 10, a wheel-side reducer assembly 16, a brake drum 6, a left half shaft 3-1, a right half shaft 3-2, a brake cam shaft 28, a brake clearance adjusting arm 31, a brake chamber 30, a brake chamber bracket 29 and the like;

the main speed reducer belt differential assembly 1 mainly comprises a front flange lock nut 61, a front flange 62, an inter-axle differential outer bearing 64, a bearing seat 63, an inter-axle differential assembly 53, an inter-axle differential inner bearing 67, a carrier case cover 65, a carrier case 66, a driving cylindrical gear 68, a driven cylindrical gear 75, a hollow shaft 69, a driving cylindrical gear mounting bearing 70, a bearing cover 71, a main gear bearing seat 72, a main gear outer bearing unit 73, a driving gear 74, a main gear inner bearing 76, a main speed reducer case 77, an inter-wheel differential bearing adjusting nut 91, an inter-wheel differential bearing 90, an inter-wheel differential assembly 84, a driven gear 85, a through shaft 80, a through shaft support bearing 79, a rear flange 82 and a rear flange lock nut 81.

The middle axle is arranged on the chassis and cannot be used independently, the middle axle and the rear axle are matched for double-axle driving, one part of power transmitted by the engine is transmitted to the middle axle, and the other part of the power is transmitted to the rear axle through the through shaft; however, in actual operation, there is a case where the rotational speeds of the wheels are not uniform between the intermediate axle and the rear axle or the wheels on both sides of a single axle slip, and for this reason, an inter-wheel differential and an inter-axle differential need to be arranged on the intermediate axle.

The inter-axle differential assembly 53 mainly consists of a front inter-axle differential case 54, a rear inter-axle differential case 59, a front side gear 56, an axle difference cross shaft 57, an axle difference planetary gear 58 and a rear half-axle gear 60; the inter-wheel differential assembly 84 mainly comprises a left differential case 83, a right differential case 88, a wheel difference planetary gear 87, a side gear 89 and a wheel difference cross shaft 86; the interaxle differential and the wheel differential both adopt a symmetrical conical planetary gear structure, and the structure and the differential principle are well known and not described in detail here. In the present embodiment, in order to adjust the backlash of the side gears and the planetary gears in the inter-axle differential assembly 53, a front side gear adjusting washer 55 is provided between the inter-axle differential case 54 and the front side gear 56.

The intermediate box 66 is mounted on a main speed reducer housing 77 through bolts, the driving cylindrical gear mounting bearing 70 is mounted in the intermediate box 66 in an interference fit manner, the hollow shaft 69 penetrates through the main driven cylindrical gear 68 and the driving cylindrical gear mounting bearing 70 to be preassembled for waiting, and the hollow shaft 69 and the driving cylindrical gear 68 are mounted through a spline fit manner. The main gear outer bearing unit 73 is press-fitted into the main gear bearing seat 72 by interference fit and then placed into the gap bridge box 66, and the main gear bearing seat 72 is connected with the gap bridge box 66 through a stud. The main gear inner bearing 76 is press-mounted in the gap bridge box 66 through interference fit, the axial diameter part of the driving gear 74 sequentially passes through the main gear inner bearing 76, the driven cylindrical gear 75 and the inner hole of the main gear outer bearing unit 73, and the front end of the driving gear 74 is fixed by screwing the bearing cover 71 through a hexagon head bolt; the driving gear 74 is in spline fit with the driven cylindrical gear 75. The inter-axle differential outer bearing 64 is press-fitted in the intermediate box cover 65 by interference fit, and the inter-axle differential inner bearing 67 is press-fitted on the rear inter-axle differential case 59 by interference fit; an inter-axle differential assembly 53 with an inter-axle differential inner bearing 67 assembly is placed in an intermediate box body 66, so that a hollow shaft 69 with a main cylindrical gear 68 is in splined connection with a rear half-axle gear 60, and the outer ring of the inter-axle differential inner bearing 67 is arranged in a corresponding hole; the assembly of the intermediate box cover 65 with the inter-axle differential outer bearing 64 is arranged on an intermediate box 66 through a hexagon bolt; the bearing cover 63 is mounted on the gap axle box cover 65 through a hexagon head bolt, the front flange 62 is mounted on the interaxial differential shell 54 through spline fit, and the front flange lock nut 61 is mounted on the interaxial differential shell 54 through threads to press the front flange 62; after the above assembling steps are completed, the main driven cylindrical gear 68 and the driven cylindrical gear 75 are engaged in a tooth form.

The driven gear 85 is fixed on the inter-wheel differential assembly 84 through bolts, the inner ring of a differential bearing 90 is respectively pressed on the left differential case 83 and the right differential case 88 through interference fit, the outer ring of the differential bearing 90 is arranged in a corresponding hole of the main speed reducer case 77, a differential bearing adjusting nut 91 is arranged on the main speed reducer case 77 through threads, and the pretightening force of the differential bearing 90 is adjusted through the screwing length of the threads at two ends; the driving gear 74 and the driven gear 85 are engaged by tooth profiles. The through shaft support bearing 79 is arranged on the through shaft 80 in an interference fit manner, the through shaft 80 with the through shaft support bearing 79 penetrates from the axle housing cover direction, passes through the hollow shaft 69 and the shaft difference cross shaft 57 and is in spline fit connection with the front half axle gear 56, and the rear bearing cover 78 is connected with the middle axle housing assembly 2 through a hexagon bolt to fix the through shaft support bearing 79; the rear flange 82 is spline-fitted to the through shaft 80, and the rear flange lock nut 81 is screw-fitted to the through shaft 80 to fix the rear flange 82.

The wheel hub assembly 10 mainly comprises a wheel bolt 11, a wheel hub 12, a wheel hub inner bearing 8, an oil receiving cover 9, a wheel hub inner oil seal 7 and a wheel hub outer bearing 13; the wheel bolt 11 is pressed on the wheel hub 12 through interference fit, the wheel hub inner bearing 8 and the wheel hub outer bearing 13 are respectively pressed in the wheel hub 12 through the interference fit of the outer ring thereof, the outer side of the wheel hub inner bearing 8 is provided with an oil seal seat ring 5, and the oil seal seat ring 5 is pressed on the middle axle housing assembly 2 through interference fit; the inner side walls of the oil seal seat ring 5 and the hub 12 are provided with an inner hub oil seal 7, and the inner hub oil seal 7 is pressed in the hub 12 through interference fit. The outer side of the oil seal 7 in the wheel hub is provided with an oil receiving cover 9, the oil receiving cover 9 is in a conical cylindrical structure with two open ends, and the large end of the oil receiving cover is mounted on a rear wheel hub 12 through bolts. The oil receiving cover 9 has the functions of: because the wheel hub inner oil seal 7 is a vulnerable part and is arranged in the wheel hub, when the wheel hub inner oil seal 7 is damaged to cause oil leakage, the leaked lubricating oil can flow into the brake drum 6 and further causes the brake friction plate in the brake assembly 4 to be stained with the lubricating oil to cause brake failure, in order to avoid the problem, an oil receiving cover 9 is arranged at one side of the rear wheel hub 12 close to the main speed reducer with the differential assembly 1, when the lubricating oil leakage occurs, the lubricating oil flows into the oil receiving cover, an oil drainage hole is arranged at the part of the rear wheel hub 12 not exceeding the maximum outer diameter of the oil receiving cover 9, and correspondingly, through holes for the lubricating oil to be drained are also arranged at the corresponding parts of the wheel side speed reducer shell 25 and the brake drum 6 in the figure; lubricating oil in the oil receiving cover can flow out to the outermost side of the brake drum through the oil drainage hole, and the oil leakage problem can be directly observed externally due to the steel ring assembled on the outer side of the brake drum, so that brake failure accidents are avoided.

The hub reduction gear assembly 16 mainly comprises a planetary gear shaft 17, a hub planetary gear 18, a sun gear 19, a planetary gear carrier 23, a planetary gear carrier mounting bolt 24, a hub reduction gear shell 25, a gear ring 26, an elastic retainer ring 27 and a gear ring support 14; the hub reduction gear assembly 16 is sleeved on the rear wheel hub assembly 10 through a hub reduction gear shell 25, wherein a sun gear 19 is fixedly arranged at the end parts of the left half shaft 3-1 and the right half shaft 3-2 through splines respectively and is fixed in position through an elastic retainer ring 21; one end of the planet wheel shaft 17 is press-fitted on the hub reduction gear shell 25 in an interference fit manner, the hub planet wheel 18 is arranged on the planet wheel shaft 17 in a rolling manner, an installation hole on the planet wheel carrier 23 is in clearance fit with the other end of the planet wheel shaft and is arranged in the hub reduction gear shell 25 through a planet wheel carrier installation bolt 24, and the hub planet wheel 18 is in meshed connection with the sun wheel 19; an inner hole at the central shaft diameter part of the gear ring support 14 is provided with a spline, the gear ring support 14 is installed on the middle axle housing assembly 2 through the spline, the excircle at the central shaft diameter part of the gear ring support is installed in interference fit with the inner ring of the hub outer bearing 13, and the gear ring support cannot move due to the fact that the gear ring support is fixed through an elastic check ring 27. The gear ring 26 is mounted on the gear ring support 14 through an internal spline, and the gear ring 26 is in meshing connection with the wheel-side planet wheels 18. The speed reducing structure adopts the sun gear 19 as a driving part, the planet gear carrier 23 as a driven part and the gear ring 26 as a fixed part; the specific deceleration principle is well known and will not be described in detail.

One end of the right half shaft 3-2 is arranged in the half shaft gear 89 through an external spline, and the other end is provided with the sun gear 19 through a spline; one end of the left half shaft 3-1 is arranged in the sliding meshing sleeve 33 and the half shaft gear 89 through an external spline, and the other end is provided with the sun gear 19 through a spline; the brake drum 6 is sleeved on the hub reduction gear shell 25; the half shaft limiting plug 20 is pressed on the end cover 22 in an interference fit manner; the end cover 22 is mounted on the hub reduction gear shell 25 through bolts; the brake chamber bracket 29 is arranged on the middle axle housing assembly 2 through a hexagon head bolt; the camshaft support 92 is mounted on the middle axle housing assembly 2 through a hexagon head bolt; the brake camshaft 28 passes through the brake assembly 4 and the camshaft fixing bracket 92, and the brake clearance adjusting arm 31 is in meshed connection with the external spline of the brake camshaft 28 through the internal spline at the inner hole; the brake chamber 30 is fixed on the brake chamber bracket 29 through a screw and a nut which are arranged on the cylinder body, and the front end of the brake chamber extends out of a push rod and is rotatably connected with a brake clearance adjusting arm 31 through a pin shaft.

After the left half shaft 3-1 and the right half shaft 3-2 are assembled, the inner part of the axle is in a full floating type, in order to ensure normal use, a hub end cover 22 is provided with a limiting plug 20, and after the half shafts move outwards to a certain position, the limiting plug 20 is attached to the cross section of the half shafts, so that the damage of the gear of the wheel reduction gear caused by the fact that the outward movement amount of the half shafts exceeds the design value is prevented.

The muck vehicle is usually driven in a muddy, soft or non-road area because the using environment of the muck vehicle is a non-paved road surface; when the vehicle is stopped due to the loss of driving force caused by the slippage of a single wheel, the vehicle can not be separated from the trapped situation and can not continuously run when being started again; in order to solve the problem, an inter-wheel forced locking anti-skid differential lock device 300 and an inter-axle forced locking anti-skid differential lock device 400 are arranged in the middle axle assembly, in the embodiment, an inter-wheel forced locking anti-skid differential lock adopts a meshing sleeve type, and an inter-axle forced locking anti-skid differential lock adopts a finger pin type, so that the two differential locks are simple and reliable in structure, convenient to operate and low in failure rate.

Referring to fig. 3, the inter-wheel forced locking anti-slip differential lock device 300 mainly comprises a fixed engaging sleeve 36, a sliding engaging sleeve 33, an outer round nut 34, a locking plate 35, a first slider 37, a first fork 38, a first fork shaft 39 and a first cylinder 40; the fixed meshing sleeve 36 is meshed with an external spline on the left differential case 83 through an internal spline and is screwed and fixed through an external round nut 34, and a locking plate 35 is arranged between the round nut 34 and the fixed meshing sleeve 36 in order to ensure that the round nut 34 is not loosened in the using process; the sliding sleeve 33 is engaged with the external splines of the left half shaft 3-1 through internal splines. One end of the first sliding block 37 is a cylinder, and the other end is a cuboid; during installation, the first slider 37 is inserted into the corresponding hole of the first fork 38, and the rectangular parallelepiped is engaged into the corresponding ring groove of the sliding engaging sleeve 33. The first shifting fork shaft 39 is a cylinder with a handle at the rear end, and splines are arranged on the surface of the cylinder, so that when the first shifting fork shaft 39 is installed, the cylindrical part of the first shifting fork shaft 39 passes through a corresponding installation hole on the middle axle housing assembly 2 and is inserted into the spline grooves of the first shifting fork 38; the handle-mounted structure at the rear end of the first shifting fork shaft 39 is fixed with the piston rod head of the first cylinder 40 through a pin shaft 41 and a cotter pin 42, and the other end of the cylinder body of the first cylinder 40 is fixed on the middle axle housing assembly 2 through a screw. When the anti-skid differential lock device with forced locking between wheels needs to be started, high-pressure air is injected into the first air cylinder 40, the first air cylinder 40 pushes the first shifting fork shaft 39 to rotate along the center of the shifting fork shaft cylinder, the sliding meshing sleeve 33 is driven to move along the direction facing the fixed meshing sleeve 36 along the spline matching surface with the left half shaft 3-1, and as the sliding meshing sleeve 36 and the fixed meshing sleeve are both provided with the engaging tooth-shaped structures on the end surface, when the sliding meshing sleeve moves to a certain position, the engaging teeth of the sliding meshing sleeve are mutually engaged with the engaging teeth of the fixed meshing sleeve; at this time, the left half shaft 3-1 and the left differential case 83 are rigidly connected, and the differential function between the left wheel and the right wheel of the original inter-wheel differential is lost; at the moment, the power transmitted from the engine of the whole automobile can be directly transmitted to the wheels on two sides, so that the automobile is helped to be separated from the skid road surface of the wheels. When the automobile is out of the trouble, the forced locking anti-skid differential lock device needs to be released, the air cylinder deflates, and the air cylinder push rod contracts under the action of a return spring in the cylinder body; the first shifting fork shaft 39 and the first shifting fork 38 are driven to rotate, so that the sliding meshing sleeve 33 moves backwards along the matching surface with the left half shaft 3-1 spline and is separated from the fixed meshing sleeve 36; the rigid connection between the left half shaft 3-1 and the left differential case 83 is released; and the differential function between the left wheel and the right wheel of the original inter-wheel differential is recovered.

Referring to fig. 4, the inter-axle forced locking antiskid differential lock device 400 is mainly composed of a differential lock ring 45, a differential lock pin 44, a second slider 46, a second fork 47, a second fork axle 48 and a second cylinder 49. The differential lock pin 44 is a cylinder with an annular groove at one end; the outer circumference of the differential lock ring 45 is provided with an annular groove, and the inner circumference is provided with a plurality of arc-shaped clamping grooves which can clamp the differential lock pin 44; during installation, the differential lock pin 44 is placed into the circular arc-shaped slot of the differential lock ring 45, so that the cylindrical end of the differential lock pin 44 is inserted into corresponding differential lock pin mounting holes on the front inter-axle differential case 54, the front side gear adjusting washer 55 and the front side gear 56. One end of the second sliding block 46 is a cylinder, and the other end is a cuboid; during installation, the cylinder of the second sliding block 46 is inserted into the corresponding hole of the second shifting fork 47, and the cuboid is clamped into the ring groove of the differential locking ring 45. The second shifting fork shaft 48 is a cylinder with a handle at the rear end, splines are arranged on the surface of the cylinder, and when the differential locking ring is installed, the cylindrical part of the second shifting fork shaft 48 passes through a corresponding installation hole on the bridge box cover 65 and is inserted into the spline groove of the second shifting fork 47, so that the position of the differential locking ring 45 is relatively fixed; the handle-shaped structure at the rear end of the second shifting fork shaft 48 is fixedly connected with a second cylinder 49 through a pin shaft 50 and a cotter pin 51, and the other end of the second cylinder 49 is fixed on a gap bridge box cover 65 through a screw 52. After normal assembly is completed, the end surface of the cylindrical end of the differential lock pin 44 is positioned in the middle of the half axle gear adjusting washer 55 and is not in contact with the front half axle gear 56; when the inter-axle forced locking antiskid differential lock device needs to be started, high-pressure air is injected into the second air cylinder 49, the second air cylinder 49 pushes the second shifting fork shaft 48 to rotate around the center of the shifting fork shaft cylinder, the differential lock pin 44 and the differential lock ring 45 are driven to move towards the front half axle gear 56 along the matching surface with the front inter-axle differential case 54, and finally the differential lock pin 44 is inserted into the differential lock pin mounting hole corresponding to the front half axle gear 56; at this time, the through shaft 80 and the front inter-axle differential case 54 are rigidly connected, and the inter-axle differential function of the intermediate axle and the rear axle of the original inter-axle differential is lost; the power transmitted from the whole vehicle engine can be directly transmitted to the middle axle and the rear axle, and the vehicle is helped to be separated from the skid road surface of the wheels. When the automobile is out of the trouble, the anti-skid differential lock device is required to be released from forced locking between shafts, the air cylinder deflates, and the air cylinder push rod contracts under the action of a return spring in the cylinder body; the second shifting fork shaft 48 and the second shifting fork 47 are driven to rotate, so that the differential lock ring 45 drives the differential lock pin 44 to move backwards along the matching surface with the front inter-axle differential shell 54 and separate from the contact with the front half-axle gear 56; the rigid connection between the front inter-shaft differential case 54 and the through-shaft 80 is released; and the differential function between the middle axle and the rear axle of the original inter-axle differential is recovered.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and the improvements and modifications are also within the protection scope of the present invention.

Claims (9)

1. The middle axle assembly of the electric muck truck is characterized by comprising a main speed reducer assembly with a differential mechanism, a middle axle housing assembly, a brake assembly, a hub assembly, a wheel hub speed reducer assembly, a brake drum, a left half axle, a right half axle, a brake cam shaft, a cam shaft bracket, a brake gap adjusting arm, a brake air chamber and a brake air chamber bracket;

the main speed reducer with the differential assembly, the brake assembly, the camshaft bracket and the brake air chamber bracket are respectively arranged on the middle axle housing assembly through bolts; the left half shaft and the right half shaft respectively penetrate through the left end and the right end of a shell of the middle axle shell assembly, one end of the left half shaft and the right half shaft is connected with a main speed reducer assembly with a differential mechanism, and the other end of the left half shaft and the right half shaft is connected with a wheel-side speed reducer assembly; the brake drum is sleeved at the rear end of a hub reduction gear shell of the hub reduction gear assembly, and the brake assembly and the rear wheel hub assembly are arranged in the brake drum and the hub reduction gear shell; one end of the brake camshaft is connected with the brake assembly, and the other end of the brake camshaft is connected with the camshaft bracket; the brake chamber is fixed on the brake chamber bracket, and the front end of the brake chamber is rotationally connected with the brake clearance adjusting arm;

the main speed reducer with differential assembly comprises an interaxle differential assembly, a main speed reducer shell, a gap bridge box body cover, a driving gear, a driven gear, a driving cylindrical gear, a driven cylindrical gear, a hollow shaft and a through shaft;

the main speed reducer shell is installed on the middle axle housing assembly through bolts, the gap bridge box body is installed at the opening end of the main speed reducer shell through bolts, and the gap bridge box body cover is installed on the gap bridge box body through bolts and used for closing the gap bridge box body; the inter-axle differential assembly is rotatably arranged in a space surrounded by the gap bridge box body and the gap bridge box body cover through a bearing; one end of the hollow shaft penetrates through the driving cylindrical gear and is rotatably arranged in the gap bridge box body, and the other end of the hollow shaft extends into the inter-axle differential assembly and is fixedly connected with a rear half-shaft gear of the inter-axle differential assembly; the driving cylindrical gear is connected with an external spline of the hollow shaft through an internal spline; one end of the through shaft penetrates through the main speed reducer shell and can be rotatably arranged on the main speed reducer shell, and the other end of the through shaft penetrates through the hollow shaft and extends into the inter-axle differential assembly to be connected with the front half axle gear through a spline; the inter-wheel differential assembly is rotatably arranged in a main speed reducer shell through a bearing, a driven gear is fixed on the inter-wheel differential assembly through a bolt, a driving gear is rotatably arranged in the main speed reducer shell through a bearing, and the driving gear is meshed with the driven gear; and the driven cylindrical gear is fixedly sleeved on the driving gear shaft through a spline, and the driven cylindrical gear is meshed with the driving cylindrical gear.

2. The electric muck vehicle middle axle assembly according to claim 1, wherein an inter-wheel forced locking antiskid differential lock device is arranged between the left half axle and the inter-wheel differential assembly, and mainly comprises a fixed meshing sleeve, a sliding meshing sleeve, a first sliding block, a first shifting fork shaft and a first cylinder; the fixed meshing sleeve is in meshed connection with an external spline on a left differential shell of the inter-wheel differential assembly through an internal spline, and the sliding meshing sleeve is in meshed connection with an external spline of a left half shaft through an internal spline; the fixed meshing sleeve is meshed and matched with the sliding meshing sleeve; one end of the first sliding block is inserted into the first shifting fork hole, and the other end of the first sliding block is clamped into the annular groove of the sliding meshing sleeve; one end of the first shifting fork shaft penetrates through the middle axle housing assembly and is inserted into a spline groove of the first shifting fork; the rear end of the first shifting fork shaft is connected with a piston rod head of a first cylinder, and the other end of the cylinder body of the first cylinder is fixed on the middle axle housing assembly through a screw rod.

3. The electric muck car middle axle assembly as set forth in claim 2, wherein a locking plate and an outer round nut are sequentially disposed on an outer side of the fixed engaging sleeve, and the locking plate and the outer round nut are used for locking the fixed engaging sleeve.

4. The electric muck vehicle middle axle assembly according to claim 1, wherein an inter-axle forced locking antiskid differential lock device is arranged on the inter-axle differential assembly, and the inter-axle forced locking antiskid differential lock device mainly comprises a differential lock ring, a differential lock pin, a second slide block, a second shifting fork shaft and a second cylinder; one end of the differential lock pin is clamped into the circular arc-shaped clamping groove of the differential lock ring and then inserted into a differential lock pin mounting hole of a front interaxle differential case of the interaxle differential assembly; one end of the second sliding block is inserted into the second shifting fork hole, and the other end of the second sliding block is clamped into the ring groove of the differential locking ring; one end of the second shifting fork shaft penetrates through a corresponding mounting hole in the gap bridge box cover to be inserted into a spline groove of the second shifting fork, the other end of the second shifting fork shaft is connected with a second cylinder piston rod head, and the other end of the second cylinder body is fixed on the gap bridge box cover through a screw.

5. The electric muck truck mid-axle assembly according to claim 1, wherein the hub reduction gear assembly comprises a planet wheel shaft, a hub planet wheel, a sun wheel, a planet wheel carrier mounting bolt, a hub reduction gear shell, a gear ring, an elastic retainer ring and a gear ring bracket;

the hub reduction gear is characterized in that a hub reduction gear shell is arranged on the front side of a rear hub through wheel bolts, one end of a planet wheel shaft is press-fitted on the hub reduction gear shell in an interference fit manner, a hub planet wheel is arranged on the planet wheel shaft in a rolling manner, a mounting hole of a planet wheel carrier is in clearance fit with the other end of the planet wheel shaft and is arranged in the hub reduction gear shell through a mounting bolt of the planet wheel carrier, a sun wheel is arranged at the end parts of a left half shaft and a right half shaft through splines, and the hub planet wheel is meshed with the sun wheel; the gear ring support is arranged at the end part of the middle axle housing assembly, is connected with the outer bearing of the wheel hub in an interference fit manner and is locked and positioned through a locking nut; the gear ring is arranged on the gear ring bracket through an internal spline and is fixed by an elastic retainer ring; the gear ring is meshed with the wheel-side planet wheel.

6. The axle assembly in an electric slag car according to claim 5, wherein one end of the left half axle and one end of the right half axle are installed in a side gear of the differential assembly between wheels through external splines, and the other end is connected with a sun gear of the wheel reduction assembly through splines and is fixed with the sun gear through a circlip.

7. The electric muck car middle axle assembly as set forth in claim 6, wherein the ends of the left and right half axles are provided with half axle limit stoppers which are press-fitted on the end caps by interference fit, and the end caps are mounted on the hub reduction gear case by bolts.

8. The electric muck car mid-axle assembly of claim 1, wherein the rear hub assembly includes wheel bolts, a rear hub, an inner hub bearing, an oil receiving cap, an inner hub oil seal, and an outer hub bearing; the rear wheel hub is rotatably arranged at two ends of the middle axle housing assembly through the wheel hub inner bearing and the wheel hub outer bearing, and the wheel bolt is pressed on the rear wheel hub in an interference fit manner; the hub inner bearing and the hub outer bearing are respectively pressed in the rear hub through the outer ring in an interference fit manner, and the hub inner oil seal is pressed on the outer side of the hub inner bearing through the interference fit manner; the oil receiving cover is arranged on the outer side of the oil seal in the hub through a bolt.

9. The electric muck car middle axle assembly according to claim 8, wherein the oil receiving cover is a conical cylindrical structure with openings at two ends, the big end of the oil receiving cover is fixed at the rear end of the rear hub through bolts, oil leakage holes are correspondingly formed in the rear hub, the hub reduction gear shell and the brake drum, and an inner cavity of the oil receiving cover is communicated with the oil leakage holes.

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