CN214647361U

CN214647361U - Wet-type brake rear axle of mining dump truck

Info

Publication number: CN214647361U
Application number: CN202120468806.9U
Authority: CN
Inventors: 唐开林; 王玉; 姜鹏威; 李光恒; 李立勇
Original assignee: Liugong Changzhou Mining Machinery Co ltd
Current assignee: Liugong Changzhou Mining Machinery Co ltd
Priority date: 2021-03-04
Filing date: 2021-03-04
Publication date: 2021-11-09
Anticipated expiration: 2031-03-04

Abstract

The utility model relates to the technical field of mining dump trucks, and provides a wet braking rear axle of a mining dump truck, which comprises a rear axle housing, a main speed reducer, and a wheel reduction gear, a half axle sleeve, a half axle and a braking component which are symmetrically arranged at the left side and the right side of the main speed reducer, wherein the braking component comprises the wheel reduction gear, a wheel hub, a wet brake, the half axle sleeve and the rear axle housing, the left side and the right side of the main speed reducer are respectively connected with one end of the half axle in a transmission way, the other end of the half axle extends outwards to be connected with the wheel reduction gear, the wheel reduction gear is fixed at the outer end of the half axle sleeve, the wheel reduction gear planet carrier is connected with the wheel hub, the wheel hub is arranged on the half axle sleeve at the inner side of the wheel reduction gear through a pair of bearings, the wet brake is arranged at the joint of the half axle sleeve and the rear axle housing, and the driving wheel of the wet brake is connected with the wheel hub, and the shell of the wet brake is connected with the rear axle housing. The device has the characteristics of safety, convenience in maintenance, high reliability, long service life, low cost, easiness in manufacturing and the like.

Description

Wet-type brake rear axle of mining dump truck

Technical Field

The utility model relates to a mining dump truck technical field, concretely relates to mining dump truck wet braking rear axle.

Background

With the development of social economy, higher requirements are put forward on the exploitation, transportation and utilization of mineral resources. The mining dump truck is used as main transportation equipment of a strip mine, and has the advantages of large carrying capacity, high transportation efficiency and high price. Users are more concerned about the reliability of the equipment and the rapidity of maintenance. Mining is a complete matching system, and productivity is reduced due to equipment failure, so that efficiency of other equipment in a matching system is also influenced, and waste is caused. How to fully exert the advantages of the equipment, improve the real rate and reduce the unit cost becomes the key point of attention of users.

A traditional rear axle adopts a shoe brake or a dry caliper disc brake, so that the friction plate is large in loss, and the long-time braking performance is reduced. The structure of the traditional rear axle assembly is as follows:

as shown in fig. 1, the conventional rear axle assembly is divided into three parts, namely a rear axle housing 1 ', a left half-axle sleeve 2 ' and a right half-axle sleeve 3 ', the left half-axle sleeve and the right half-axle sleeve are welded into a whole with the rear axle housing, when a certain part of the rear axle assembly is damaged and needs to be replaced, the rear axle assembly needs to be disassembled and decomposed, and then the rear axle assembly is transported to an outside service factory for repair, so that the maintenance cost is high. Meanwhile, when the side parts are broken and damaged and need to be maintained and replaced, the whole rear axle assembly needs to be disassembled, and the other side which is not damaged needs to be completely disassembled. The structure brings a lot of unnecessary disassembly and assembly processes, so that the maintenance and replacement work period is long, the production efficiency is seriously influenced, and spare parts of the rear axle assembly have to be ordered in order to improve the efficiency. Meanwhile, the integral welding structure causes that the whole rear axle assembly is subjected to scrapping treatment as long as the axle shaft sleeve on one side is damaged, so that the maintainability and the interchangeability are poor, unnecessary waste is caused, and the maintenance cost of equipment is increased.

Therefore, the conventional rear axle has the following disadvantages:

(1) poor maintainability: the replacement cycle of the brake friction plate is short; the half shaft replacement causes a large amount of unnecessary disassembly and assembly;

(2) poor maintainability; the whole rear axle cannot be repaired when the rear axle is seriously damaged, so that the whole rear axle is scrapped;

(3) the manufacturing difficulty is high, the spare part cost is high, the axle sleeve and the rear axle housing are welded by different materials, the welding difficulty is high, the axle sleeve and the rear axle housing are easy to crack, in order to ensure the welding quality, the post-welding processing is adopted, the size of the rear axle housing assembly is large, and the processing cost is increased sharply;

(4) the use cost is high, and the spare parts and the maintenance cost are high;

(5) the non-braking cooling system has poor stability, is not closed and is influenced by the environment.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: in order to overcome the defects in the prior art, the utility model provides a wet braking rear axle of a mining dump truck.

The utility model provides a technical scheme that its technical problem will adopt is: the utility model provides a mining dump truck wet braking rear axle, includes that main reducer and symmetry set up the brake subassembly in the main reducer left and right sides, the brake subassembly includes hub reduction gear, wheel hub, wet brake, semi-axis sleeve pipe and rear-axle housing, and wherein, main reducer sets up the inside at the rear-axle housing, and the one end of a semi-axis is connected in the transmission respectively to the left and right sides, the other end of semi-axis outwards extends and connects the hub reduction gear, and the semi-axis outside coaxial sleeve pipe and rear-axle housing are established in proper order to the cover, wheel hub installs on the inboard semi-axis sleeve pipe of hub reduction gear, wet brake sets up the junction of semi-axis sleeve pipe and rear-axle housing, and wet brake's drive wheel links to each other with wheel hub, and wet brake's casing links to each other with the rear-axle housing.

Further, in order to improve maintainability, with the setting of half axle sleeve components of a whole that can function independently, it is specific, the half axle sleeve pipe is two, is left half axle sleeve pipe and right half axle sleeve pipe respectively, left side half axle sleeve pipe and right half axle sleeve pipe are located rear-axle housing left and right ends respectively, and left half axle sleeve pipe and right half axle sleeve's one end insert respectively in the rear-axle housing and be connected with the rear-axle housing, and the left side half axle sleeve pipe other end outwards extends and left wheel reduction gear is connected, and the right half axle sleeve pipe other end outwards extends and is connected with the wheel reduction gear on right side.

Further, in order to enable the axle sleeve to be transversely arranged in the rear axle housing, at least one annular boss for supporting the axle sleeve is axially arranged in the rear axle housing.

Specifically, the connection end faces between the left half shaft sleeve and the rear axle housing, the right half shaft sleeve and the rear axle housing are connected through the positioning pins and the bolts.

Further, in order to avoid loosening or falling off of the bolt, the bolt is provided with a locking structure.

Further, in order to avoid the inside lubricating oil of rear-axle housing to pass through and be connected the outside seepage of face, all be provided with O type sealing washer between the laminating terminal surface of left side axle sleeve pipe and right axle sleeve pipe and rear-axle housing.

Further, wet brake includes casing, drive wheel, spring, first dynamic seal, second dynamic seal, parking brake piston, friction disc group and service brake piston, wherein, friction disc group includes static friction disc and dynamic friction disc, static friction disc installs on the casing, the casing is installed on the rear axle housing, keep fixed, dynamic friction disc installs on the drive wheel, the drive wheel links to each other with wheel hub, it is rotatory to be driven by wheel hub during the travel, the drive wheel outside seals through sealing between first dynamic seal and the fixed casing, the drive wheel inboard seals through second dynamic seal and semi-axis sleeve pipe, parking brake piston and service brake piston set up respectively in friction disc group left and right sides, and spring elastic support is between parking brake piston and wheel hub.

The wet brake has four working states:

(1) in a running state, the parking brake control port is pressurized, and the parking brake is released; the service brake control port releases pressure, the friction plate groups are separated, and service brake is released.

(2) When the service brake works, the parking brake control port is pressurized, and the parking brake is released; the service brake control port is pressurized, the friction plate sets are contacted, and service brake works.

(3) When emergency braking works, the pressure of the parking brake control port is relieved, and parking brake works; the service brake control port is pressurized, the friction plate sets are contacted, and service brake works.

(4) When the automobile is in a parking state, the parking brake control port releases pressure, and parking brake works; the service brake control port releases pressure, the friction plate groups are separated, and service brake is released.

A large amount of heat energy is generated between the friction plates during braking, the heat energy is taken away through cooling oil, and the heat energy is dissipated through an external radiator, so that the temperature during braking is not increased, the cooling oil enters a cavity formed by the driving wheel and the half shaft through the shell, enters the friction plate group from the hole in the driving wheel, and flows out from the hole close to the outer end after fully absorbing the heat energy.

The utility model has the advantages that:

(1) security

The spring force and the low-pressure hydraulic force are directly transmitted to the hub, an intermediate actuating element is not arranged, and spring braking is automatically implemented when no pressure exists. The oil cooling and totally enclosed structure avoids the hidden troubles of high temperature and even open fire and the like generated during braking.

The maintenance is convenient: when any part of the left half-shaft sleeve, the rear axle housing and the right half-shaft sleeve needs to be replaced, the replacement of the left half-shaft sleeve and the right half-shaft sleeve can be carried out on a maintenance site, and particularly, the whole rear axle and the other half-shaft sleeve do not need to be disassembled or assembled, so that a large amount of labor and time cost are saved.

(2) The reliability is high: the oil-cooled and totally-enclosed structure avoids heat fading, is not influenced by water, dust and other environments, and has stable braking efficiency and stable braking. The assembled axle shaft sleeve is of an inserted structure, the performance of the assembled axle shaft sleeve reaches the level of an integral rear axle, a positioning pin is used for bearing torsional moment, and a bolt basically does not bear shearing force; and meanwhile, the half-shaft sleeve extends into the rear axle, so that the stress of the connecting part is reduced, and the inside of the rear axle is reinforced.

(3) Long service life

The friction area of the wet brake is more than 10 times that of a drum brake with the same tonnage and more than 30 times that of a dry disc brake, and the wear rate is extremely low due to oil film contact between friction plate groups, so that the service life of the friction plates is very long.

(4) The cost is low: the wet brake friction plate has long service life and low maintenance cost, improves the attendance rate, can be used as a parking brake and a retarder at the same time, reduces the loads of a front brake and a gearbox retarder, and has higher comprehensive cost performance than a drum brake and a dry disc brake. The whole rear axle does not need to be replaced after the half-axle sleeve is damaged, so that a large amount of spare part cost, labor and time cost for maintenance are saved.

(5) Easy manufacture: the assembly type is adopted, the original welding structure of the integral rear axle is cancelled, the axle sleeve and the rear axle housing are made of different materials, the strength is high, the axle sleeve and the rear axle housing are not easy to weld, the stress is completely borne by a welding line, the requirement on the quality of the welding line is high, and the manufacturing difficulty is reduced due to the adoption of the assembly type structure.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of a rear axle of a conventional mining dump truck.

Fig. 2 is the structure schematic diagram of the wet braking rear axle of the mining dump truck.

Fig. 3 is an enlarged schematic view of a structure at a in fig. 2.

Fig. 4 is an enlarged schematic view of B in fig. 2.

Fig. 5 is a schematic structural view of the wet brake.

In the figure: 1 ' -rear axle housing, 2 ' -left axle housing, 3 ' -right axle housing, 1-wheel reduction gear, 2-wheel hub, 3-driving wheel, 4-wet brake, 41-spring, 42-first dynamic seal, 43-second dynamic seal, 44-parking brake piston, 45-friction plate set, 46-service brake piston, 5-shell, 6-axle shaft, 7-axle housing, 71-left axle housing, 72-right axle housing, 8-rear axle housing, 9-main reduction gear, 10-locating pin, 11-bolt, 12-O type sealing ring, 13-anti-loose structure.

Detailed Description

The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.

As shown in figure 2, the wet braking rear axle of the mining dump truck of the utility model comprises a rear axle housing 8, a main reducer 9 and braking components symmetrically arranged at the left side and the right side of the main reducer 9, the brake assembly comprises a hub reduction gear 1, a hub 2, a wet brake 4, a half shaft 6 and a half shaft sleeve 7, wherein, the main reducer 9 is arranged inside the rear axle housing 8, the left side and the right side are respectively connected with one end of a half shaft 6 in a transmission way, the other end of the half shaft 6 extends outwards to be connected with the wheel-side reducer 1, and the outer side of the half shaft 6 is sequentially coaxially sleeved with a half shaft sleeve 7 and a rear axle housing 8, the hub 2 is arranged on the half shaft sleeve 7 at the inner side of the hub reduction gear 1, the wet brake 4 is arranged at the joint of the half shaft sleeve 7 and the rear axle housing 8, and the driving wheels 3 of the wet brake 4 are connected to the wheel hub 2 and the housing 5 of the wet brake 4 is connected to the rear axle housing 8.

The axle sleeve pipe 7 is two, is left axle sleeve pipe 71 and right axle sleeve pipe 72 respectively, both ends about left side axle sleeve pipe 71 and right axle sleeve pipe 72 are located rear-axle housing 8 respectively, and the one end of left side axle sleeve pipe 71 and right axle sleeve pipe 72 inserts respectively in rear-axle housing 8 and is connected with rear-axle housing 8, and the left side axle sleeve pipe 71 other end outwards extends and is connected with left wheel reduction 1, and the other end of right axle sleeve pipe 72 outwards extends and is connected with right wheel reduction 1. At least one annular boss for supporting the axle sleeve 7 is axially arranged in the rear axle housing 8, and the step surface in the rear axle housing 8 plays a role in supporting the axle sleeve 7.

As shown in fig. 4 and 5, the connection end surfaces between the left and right axle sleeves 71, 72 and the rear axle housing 8 are connected by the positioning pins 10 and the bolts 11. The bolt 11 is provided with a locking structure 13. O-shaped sealing rings 12 are arranged between the joint end faces of the left half shaft sleeve 71, the right half shaft sleeve 72 and the rear axle housing 8.

As shown in fig. 5, the wet brake 4 includes a housing 5, a driving wheel 3, a spring 41, a first dynamic seal 42, a second dynamic seal 43, a parking brake piston 44, a friction plate set 45 and a service brake piston 46, where the friction plate set 45 includes a static friction plate and a dynamic friction plate, the static friction plate is installed on the housing 5, the housing 5 is installed on the rear axle housing 8 and is kept fixed, the dynamic friction plate is installed on the driving wheel 3, the driving wheel 3 is connected with the hub 2 and is driven by the hub 2 to rotate during driving, the outer side of the driving wheel 3 is sealed with the fixed housing 5 through the first dynamic seal 42, the inner side of the driving wheel 3 is sealed with the axle sleeve 7 through the second dynamic seal 43, the parking brake piston 44 and the service brake piston 46 are respectively disposed on the left and right sides of the friction plate set 45, and the spring 41 is elastically supported between the parking brake piston 44 and the hub 2.

The working principle is as follows:

when the vehicle runs, power is input by a main speed reducer 9 to perform primary speed reduction and torque increase, the power is transmitted to the wheel-side speed reducers 1 on two sides through the half shafts 6, the power is transmitted to the wheel hubs 2 after speed reduction and torque increase to drive wheels to rotate to drive the vehicle to run, meanwhile, the wheel hubs 2 also drive the driving wheels 3 of the wet brakes 4 to rotate together, friction plates are mounted on the driving wheels 3, the same number of friction plates are mounted on the shells 5 of the wet brakes 4, when braking is needed, brake oil pushes multiple groups of friction plates in the shells 5 to be in contact with the friction plates on the driving wheels 3, so that the rotation of the driving wheels 3 is limited, braking force is generated and transmitted to the wheel hubs 2 and then to tires, and the vehicle is decelerated.

The assembled rear axle has the main characteristics that:

convenient maintenance and low cost. The half-shaft sleeve 7 can be replaced independently, and spare part cost and maintenance cost are saved.

The rear axle is stressed evenly. The axle shaft sleeve is inserted into the rear axle to transmit the force to the center of the rear axle with the strongest load, rather than the concentrated connecting part, so that the service life of the rear axle is prolonged.

The pin connection is safer. The axle sleeve 7 and the rear axle housing 8 are connected by adopting a pin and bolt structure, main torque is transmitted by the pin, and the bolt only bears a small part of torque, so that the axle sleeve is more reliable.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a mining dump truck wet braking rear axle which characterized in that: including rear axle housing (8), main reducer (9) and the symmetry sets up the brake subassembly in the main reducer (9) left and right sides, brake subassembly includes hub reduction gear (1), wheel hub (2), wet brake (4), semi-axis (6) and semi-axis sleeve pipe (7), wherein, main reducer (9) sets up the inside at rear axle housing (8), and the left and right sides is the one end of transmission connection semi-axis (6) respectively, the other end of semi-axis (6) outwards extends connection hub reduction gear (1), and semi-axis sleeve pipe (7) and rear axle housing (8) are established to the coaxial cover in proper order in the semi-axis (6) outside, wheel hub (2) are installed on the inboard semi-axis sleeve pipe (7) of hub reduction gear (1), wet brake (4) set up the junction of semi-axis sleeve pipe (7) and rear axle housing (8), and the drive wheel (3) of wet brake (4) link to each other with wheel hub (2), the housing (5) of the wet brake (4) is connected with a rear axle housing (8).

2. The wet brake rear axle of the mining dump truck as defined in claim 1, wherein: half axle sleeve pipe (7) are two, are left half axle sleeve pipe (71) and right half axle sleeve pipe (72) respectively, both ends about left side half axle sleeve pipe (71) and right half axle sleeve pipe (72) are located rear-axle housing (8) respectively, and the one end of left side half axle sleeve pipe (71) and right half axle sleeve pipe (72) insert respectively in rear-axle housing (8) and be connected with rear-axle housing (8), and left side half axle sleeve pipe (71) other end outwards extends and is connected with left wheel reduction gear (1), and the other end of right half axle sleeve pipe (72) outwards extends and is connected with wheel reduction gear (1) on right side.

3. The wet brake rear axle of the mining dump truck as defined in claim 1, wherein: at least one annular boss used for supporting the axle sleeve (7) is axially arranged in the rear axle housing (8).

4. The wet brake rear axle of the mining dump truck as defined in claim 2, wherein: the left half shaft sleeve (71), the right half shaft sleeve (72) and the rear axle housing (8) are connected through the positioning pin (10) and the bolt (11).

5. The wet brake rear axle of the mining dump truck as defined in claim 4, wherein: the bolt (11) is provided with a locking structure (13).

6. The wet brake rear axle of the mining dump truck as defined in claim 2, wherein: and O-shaped sealing rings (12) are arranged between the laminating end faces of the left half shaft sleeve (71), the right half shaft sleeve (72) and the rear axle housing (8).

7. The wet brake rear axle of the mining dump truck as defined in claim 1, wherein: the wet brake (4) comprises a shell (5), a driving wheel (3), a spring (41), a first dynamic seal (42), a second dynamic seal (43), a parking brake piston (44), a friction plate set (45) and a service brake piston (46), wherein the friction plate set (45) comprises a static friction plate and a dynamic friction plate, the static friction plate is arranged on the shell (5), the shell (5) is arranged on a rear axle housing (8) and is kept fixed, the dynamic friction plate is arranged on the driving wheel (3), the driving wheel (3) is connected with a wheel hub (2), the wheel hub (2) drives the driving wheel to rotate during running, the outer side of the driving wheel (3) is sealed with the fixed shell (5) through the first dynamic seal (42), the inner side of the driving wheel (3) is sealed with a half-shaft sleeve (7) through the second dynamic seal (43), the parking brake piston (44) and the service brake piston (46) are respectively arranged on the left side and the right side of the friction plate set (45), and the spring (41) is elastically supported between the parking brake piston (44) and the hub (2).