Explosion-proof differential steering wheel system with caliper brake

Abstract

The invention discloses an anti-explosion differential steering wheel system with a caliper brake, which can solve the problem that a steering wheel is unstable due to different rotating speeds between two wheels during turning, can stably run in an anti-explosion environment, and realizes short-time and short-distance emergency braking. Torque is input through the driving motor, passes through the gearbox, the differential mechanism and the driving speed reducer and then is output to the tires, forward and backward power is provided for the differential steering wheel system, an inner wheel and an outer wheel can rotate at different speeds when a steering wheel turns at a high speed under the action of the differential mechanism assembly, the driving efficiency is improved, and the running stability of a vehicle is effectively guaranteed. Brake torque provided by the caliper brake assembly acts on tires through the gear box, the differential mechanism and the driving speed reducer, so that the steering wheel can complete braking in a short time and a short distance. All components of the differential steering wheel are subjected to explosion-proof sealing, and explosion-proof electric appliance elements are adopted, so that fire disasters or explosions in the external environment caused by the differential steering wheel can be effectively prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of differential steering wheel systems, and in particular to an explosion-proof differential steering wheel system with a caliper brake. Background Art

[0002] In recent years, with the continuous improvement of my country's intelligent manufacturing level, AGV (automatic guided vehicle) has been increasingly valued in the market, especially in aerospace, military industry, new energy, heavy machinery factories, railway transportation, special industries, ports and airports, large voltage equipment factories and other places.

[0003] In these applications, there are dangerous factors such as flammable and explosive gases, steam, dust or mixtures, and the AGV needs to be able to travel in these explosion-hazardous areas without increasing the risk of danger; in some emergency situations, the AGV needs to be able to achieve emergency braking in a short time and short distance. At this time, the AGV and its driving part steering wheel system need to be explosion-proof and able to achieve emergency braking.

[0004] Common steering wheel systems, when an emergency occurs and an emergency stop is required, generally use a solution that the drive motor gradually reduces the speed and the drive motor parking brake simultaneously holds the motor shaft. This solution has a small braking torque, a long braking distance, and great damage to the motor parking brake, which will seriously reduce the life of the parking brake. Common steering wheel systems are generally not explosion-proof.

[0005] Therefore, in such application occasions, it is necessary to provide an explosion-proof differential steering wheel system with caliper brakes. Summary of the invention

[0006] In order to solve the above technical problems, the implementation of the present invention provides an explosion-proof differential steering wheel system with caliper brakes, which can solve the steering wheel instability problem caused by the different rotation speeds between the two wheels when turning, can operate stably in an explosion-proof environment, and can achieve short-time and short-distance emergency braking.

[0007] To achieve the above object, the embodiments of the present invention adopt the following technical solutions: An explosion-proof differential steering wheel system with a caliper brake, the steering wheel system comprising a caliper brake assembly, the caliper brake assembly is used for emergency braking of the differential steering wheel, the caliper brake assembly is mounted on the steering wheel base assembly, and is kept sealed and isolated from the steering wheel base assembly; The brake disc in the caliper brake assembly is connected to the gear box of the steering wheel base assembly through the brake input shaft; The pressure is transmitted through hydraulic pipelines or signals are transmitted through cables, acting on the caliper. The caliper friction plate closes, applying pressure to the middle brake disc, generating braking torque on the brake disc.

[0008] Further, the caliper brake assembly includes a brake input shaft, a caliper, a brake disc, a brake explosion-proof housing, an explosion-proof gland, a caliper bracket and a seal; the caliper bracket is mounted on the steering wheel base assembly, and the caliper is mounted on the caliper bracket; The brake input shaft is mounted on the brake input gear through bearings and screws; the brake disc is mounted on the brake input shaft through screws; The explosion-proof cable gland is installed on the brake explosion-proof housing, and the brake explosion-proof housing is equipped with a sealing ring and installed on the steering wheel base assembly.

[0009] Furthermore, the caliper brake assembly and the steering wheel base assembly are kept sealed and isolated by means of a sealing plug cover and a rotating skeleton sealing ring.

[0010] Furthermore, the steering wheel system also includes a steering wheel base assembly, a differential assembly, a driving wheel assembly and a steering swing assembly; The steering wheel base assembly is used for bearing the differential steering wheel and transmitting the power of the differential steering wheel, and the differential assembly is used for power distribution of the differential steering wheel, and is installed on the steering wheel base assembly through bearings and fixed sleeves; The driving wheel assembly is used for the running of the differential steering wheel, and the steering and swinging assembly is used for the steering and small-angle swing of the differential steering wheel.

[0011] Furthermore, the steering wheel base assembly includes a drive motor, a base, a motor input gear, a transmission gear, an output gear, a brake input gear, a bearing end cover, a gear box end cover, a base end cover, and a seal; The base is a bearing structure of the steering wheel, a driving motor is arranged on the base, a transmission gear is arranged outside the motor input gear, the transmission gear transmits the output of the motor to the output gear located in the middle of the base, and the other side of the transmission gear is a brake input gear; Each gear is provided with a bearing end cover, a sealing member is provided outside the bearing end cover, and the bearing end cover is fixed to the gear box end cover by screws.

[0012] Furthermore, the differential assembly includes a differential, a bowl gear, and a differential input gear, wherein the bowl gear is connected to the differential by screws; and the differential input gear is fixed to the output gear by bearings, screws, and screw end covers.

[0013] Furthermore, the driving wheel assembly includes a tire, a driving reducer, a transmission shaft, a fixed sleeve, and a seal; the driving reducer is located on the axle center side of the tire, and the transmission shaft is connected between the driving reducer and the differential; the fixed sleeve is installed on the base assembly, and the fixed sleeve is embedded with the transmission shaft; the differential assembly is installed on the fixed sleeve through a bearing; and the transmission shaft is connected to the differential assembly through a key.

[0014] Furthermore, the steering swing assembly includes a steering motor, a steering reducer, a steering pinion, a slewing bearing, a mounting plate, a swing plate, a sliding bearing end cover, a mechanical limit block, and an explosion-proof proximity switch; the swing plate is divided into a left part and a right part, and is mounted on the base through a sliding bearing and a sliding bearing end cover; The slewing bearing and the mounting plate are mounted on the swing plate; the steering motor is mounted on the steering reducer; the steering reducer is mounted on the mounting plate; the steering pinion is mounted on the steering reducer; the mechanical limit block is mounted in the bottom groove of the slewing bearing; the explosion-proof proximity switch is fixed to the swing plate by threads. Beneficial Effects

[0015] The explosion-proof differential steering wheel system with caliper brake provided by the present invention inputs torque through the drive motor, and after being shunted by the gear box, the differential, and the drive reducer, it is output to the tire, providing forward and backward power for the differential steering wheel system, enabling the inner and outer wheels of the steering wheel to rotate at different speeds when turning at high speed, improving the driving efficiency, effectively ensuring the stability of the vehicle operation, and providing better maneuverability in emergency obstacle avoidance or complex road conditions. When encountering an unexpected situation and emergency braking is required, the braking torque provided by the caliper brake assembly acts on the tire through the gear box, the differential, and the drive reducer, which can provide a great braking torque for the steering wheel, so that the steering wheel can complete braking in a short time and a short distance, and the caliper brake assembly has a long service life and is easy to replace. The differential steering wheel system is sealed in all parts, uses explosion-proof electrical components, and is flameproofed, which can effectively prevent fire or explosion in the external environment caused by the electrical, transmission, and braking reasons of the steering wheel itself.

[0016] Compared with the prior art, the beneficial effects of this application are: The brake disc in the caliper brake assembly of the present invention is connected to the gear box of the steering wheel base assembly through the brake input shaft. When emergency braking is required, the pressure is transmitted through the hydraulic pipeline or the signal is transmitted through the cable to act on the caliper. At this time, the caliper friction plate begins to apply pressure to the middle brake disc, generating a braking torque on the brake disc. The braking torque acts on the tire through the gear box, differential, and reducer, and the differential steering wheel brakes. This method of using caliper brakes can generate a larger braking torque than the motor parking brake, making the differential steering wheel braking distance shorter, and the caliper brake has a longer life and is easy to replace.

[0017] The swing plate in the steering swing assembly of the present invention is connected to the steering wheel base assembly through two sets of bearings and bearing end covers. When the differential wheel travels on an uneven road surface, the swing cylinder can swing 3° through the bearing to ensure that the differential wheel is connected to the vehicle body in a horizontal state, preventing the cargo from tipping over due to the instability of the vehicle body; When the steering angle of the slewing bearing in the steering swing assembly of the present invention exceeds a specified angle, the mechanical limit block at the bottom of the slewing bearing will trigger the explosion-proof proximity switch, and the explosion-proof proximity switch will generate a signal to transmit to the driver, and the motor will gradually decrease to stop. At the same time, the mechanical limit block will hit the mounting plate, causing the steering action to stop; The differential steering wheel system of the present invention is flameproofed for the high-speed gear system and caliper brake assembly in response to explosion-proof requirements, and explosion-proof electrical components are selected, making the differential steering wheel system more suitable for environments requiring explosion-proof. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution in the present invention, the drawings required for use in the present invention will be briefly introduced below. It is obvious that the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a structural front view of an embodiment of the present invention; Figure 2 is a rear view of the structure in an embodiment of the present invention; Figure 3 is a front cross-sectional view of a structure in an embodiment of the present invention; Figure 4 is a side cross-sectional view of a structure in an embodiment of the present invention;

[0020] Figure 5 is a schematic structural diagram of a caliper brake assembly in an embodiment of the present invention; The symbols in the figure indicate: 1-drive motor; 2-base; 3-steering motor; 4-steering reducer; 5-steering gear; 6-slewing bearing; 7-mounting plate; 8-drive motor reducer; 9-tire; 10-base cover; 11-swing plate; 12-drive shaft; 13-fixed sleeve; 14-differential; 15-pot gear; 16-differential input gear; 17-motor input gear; 18-drive gear; 19-output gear; 20-brake input gear; 21-first bearing end cover, 22-second bearing end cover, 23 third-bearing end cover; 24-gearbox end cover; 25-brake input shaft; 26-caliper; 27-brake disc; 28-brake explosion-proof housing; 29-explosion-proof gland; 30-sliding bearing end cover; 31-nylon protective cover; 32-caliper bracket; 33-mechanical limit block; 34-explosion-proof proximity switch. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The explosion-proof differential steering wheel system with caliper brakes comprises a steering wheel base assembly, a driving wheel assembly, a differential assembly, a steering swing assembly, and a caliper brake assembly.

[0023] The steering wheel base assembly is used for bearing the differential steering wheel and transmitting the power of the differential steering wheel, and includes a drive motor 1, a base 2, a motor input gear 17, a transmission gear 18, an output gear 19, a brake input gear 20, a bearing end cover, a gear box end cover 24, a brake explosion-proof housing 28, and a seal (sealing ring, a rotating skeleton sealing ring, and a sealing plug cover); in this embodiment, three bearing end covers are included, as shown in the figure, including a first bearing end cover 21, a second bearing end cover 22, and a third bearing end cover 23, which are respectively used to adjust the bearing clearances of the motor input gear, the transmission gear 18, and the output gear; and are used to seal the gear box assembly.

[0024] The motor input gear 17, transmission gear 18, output gear 19, and brake input gear 20 are installed on the base 2 through bearings. After the bearings and sealing rings are installed, the gearbox end cover 24 is installed on the base 2 through cylindrical pins, screws, and stoppers. After the bearings and sealing rings are installed, the bearing end covers are installed on the base 2 through stoppers and screws. At this time, the gears are completely positioned, and then the remaining seals of the gearbox part of the base 2 are installed. The drive motor 1 is installed on the base 2 through keys, screws, and stoppers. After the differential assembly and the drive wheel assembly are installed on the base, the brake explosion-proof housing 28 is pressed into the sealing ring and connected to the base 2 with screws.

[0025] The differential assembly is used for power distribution of the differential steering wheel, and includes a differential 13, a basin gear 15, and a differential input gear 16. The basin gear 15 is connected to the differential 13 by screws. The differential input gear is fixed to the output gear 19 by bearings, screws, and screw end caps. The differential assembly is installed on the base 2 by bearings and fixed sleeves 13.

[0026] The driving wheel assembly is used for the travel of the differential steering wheel, and includes a tire 9, a driving reducer 8, a transmission shaft 12, a fixed sleeve 13, and a seal. After the fixed sleeve 13 is installed with a sealing ring and a bearing, it is installed on the base assembly by screws. Through the other side of the base, the differential assembly is installed on the fixed sleeve 13 through the bearing, and another fixed sleeve 13 is installed at this time. The transmission shaft 12 passes through the internal skeleton sealing ring of the fixed sleeve 13 and is connected to the differential assembly by a key. The driving reducer 8 is installed on the fixed sleeve 13 by screws and stoppers, and is connected to the driving shaft 12 by a key. The tire 9 is installed on the driving reducer 8 by screws and stoppers.

[0027] The steering swing assembly is used for steering and small-angle swing of the differential steering wheel, and includes a steering motor 3, a steering reducer 4, a steering pinion 5, a slewing bearing 6, a mounting plate 7, a swing plate 11, a sliding bearing end cover 30, a nylon protective sleeve 31, a mechanical stop block 33, and an explosion-proof proximity switch 34. The swing plate 11 is divided into left and right parts, and is mounted on the base 2 through a sliding bearing and a sliding bearing end cover 30. The nylon protective sleeve 31 is fixed to the swing plate 11 by screws. The slewing bearing 6 and the mounting plate 7 are mounted on the swing plate 11 by screws and cylindrical pins. The steering motor 3 is mounted on the steering reducer 4 by screws and stoppers. The steering reducer 4 is mounted on the mounting plate 7 by screws and stoppers. The steering pinion 5 is mounted on the steering reducer 4 by gaskets and screws. The mechanical stop block 33 is mounted in the bottom groove of the slewing bearing 6 by screws. The explosion-proof proximity switch 34 is fixed to the swing plate 11 by screws.

[0028] The caliper brake assembly is used for emergency braking of differential steering wheels, and includes a brake input shaft 25, a caliper 26, a brake disc 27, a brake explosion-proof housing 28, an explosion-proof gland 29, a caliper bracket 32, and a seal. The brake input shaft 25 is installed on the brake input gear 20 through bearings, screws, and keys, and the caliper brake assembly is sealed and isolated from the steering wheel base assembly through a sealing plug cover and a rotating skeleton sealing ring. The caliper 26 is installed on the caliper bracket 32 ​​through screws. The caliper bracket 32 ​​is installed on the steering wheel base assembly through screws and cylindrical pins. The brake disc 27 is installed on the brake input shaft 25 through screws. The explosion-proof gland 29 is installed on the brake explosion-proof housing 28 through threaded connection. After the sealing ring is installed, the brake explosion-proof housing 28 is installed on the steering wheel base assembly through screws.

[0029] The differential steering wheel system, driving, steering motor anti-torsion cables, and caliper brake components (anti-torsion oil pipes or cables) enter the nylon protective cover 31 of the steering swing component and exit from the slewing bearing 6.

[0030] When the differential steering wheel system is in use, since the differential and the gears of the base gear box rotate at high speed, gear oil needs to be added to the inner cavity of the base 2, and the gear oil submerges 3 / 4 of the height of the basin gear.

[0031] The present application discloses an explosion-proof differential steering wheel system with caliper brakes, which can solve the problem of instability of the steering wheel caused by the different rotation speeds between the two wheels when turning, and can operate stably in an explosion-proof environment to achieve short-time and short-distance emergency braking. The method of the present invention includes a steering wheel base assembly, a differential assembly, a driving wheel assembly, a steering swing assembly, and a caliper brake assembly.

[0032] The torque is input by the driving motor, and after passing through the gearbox, differential, and drive reducer, it is output to the tire, providing forward and backward power for the differential steering wheel system. Under the action of the differential assembly, the inner and outer wheels of the steering wheel can rotate at different speeds when turning at high speed, which improves the driving efficiency and effectively ensures the stability of vehicle operation. In the event of an unexpected situation and emergency braking is required, the braking torque provided by the caliper brake assembly acts on the tire through the gearbox, differential, and drive reducer, so that the steering wheel can complete braking in a short time and short distance. All components of the differential steering wheel are flameproof sealed and use explosion-proof electrical components, which can effectively prevent fire or explosion in the external environment caused by the differential steering wheel itself.

[0033] The brake disc in the caliper brake assembly of the present invention is connected to the gear box of the steering wheel base assembly through the brake input shaft. When emergency braking is required, the pressure is transmitted through the hydraulic pipeline or the signal is transmitted through the cable to act on the caliper. At this time, the caliper friction plate begins to apply pressure to the middle brake disc, generating a braking torque on the brake disc. The braking torque acts on the tire through the gear box, differential, and reducer, and the differential steering wheel brakes. This method of using caliper brakes can generate a larger braking torque than the motor parking brake, making the differential steering wheel braking distance shorter, and the caliper brake has a longer life and is easy to replace.

[0034] The swing plate in the steering swing assembly of the present invention is connected to the steering wheel base assembly through two sets of bearings and bearing end covers. When the differential wheel travels on an uneven road surface, the swing cylinder can swing 3° through the bearing to ensure that the differential wheel is connected to the vehicle body in a horizontal state, preventing the cargo from tipping over due to the instability of the vehicle body; When the steering angle of the slewing bearing in the steering swing assembly of the present invention exceeds a specified angle, the mechanical limit block at the bottom of the slewing bearing will trigger the explosion-proof proximity switch, and the explosion-proof proximity switch will generate a signal to transmit to the driver, and the motor will gradually decrease to stop. At the same time, the mechanical limit block will hit the mounting plate, causing the steering action to stop; The differential steering wheel system of the present invention is flameproofed for the high-speed gear system and caliper brake assembly in response to explosion-proof requirements, and explosion-proof electrical components are selected, making the differential steering wheel system more suitable for environments requiring explosion-proof.

Claims

1. An explosion-proof differential steering wheel system with caliper brakes, characterized in that: The steering wheel system includes a caliper brake assembly, which is used for emergency braking of the differential steering wheel. The caliper brake assembly is installed on the steering wheel base assembly and is sealed and isolated from the steering wheel base assembly. The brake disc in the caliper brake assembly is connected to the gear box of the steering wheel base assembly through the brake input shaft; The pressure is transmitted through hydraulic pipelines or signals are transmitted through cables, acting on the caliper. The caliper friction plate closes, applying pressure to the middle brake disc, generating braking torque on the brake disc.

2. The explosion-proof differential steering wheel system with caliper brake according to claim 1, characterized in that: The caliper brake assembly includes a brake input shaft, a caliper, a brake disc, a brake explosion-proof housing, an explosion-proof cable gland, a caliper bracket and a seal; the caliper bracket is mounted on the steering wheel base assembly, and the caliper is mounted on the caliper bracket; The brake input shaft is mounted on the brake input gear through bearings and screws; the brake disc is mounted on the brake input shaft through screws; The explosion-proof cable gland is installed on the brake explosion-proof housing, and the brake explosion-proof housing is equipped with a sealing ring and installed on the steering wheel base assembly.

3. The explosion-proof differential steering wheel system with caliper brake according to claim 2, characterized in that: The caliper brake assembly and the steering wheel base assembly are kept sealed and isolated by means of a sealing plug cover and a rotating skeleton sealing ring.

4. The explosion-proof differential steering wheel system with caliper brake according to claim 2, characterized in that: The steering wheel system also includes a steering wheel base assembly, a differential assembly, a driving wheel assembly and a steering swing assembly; The steering wheel base assembly is used for bearing the differential steering wheel and transmitting the power of the differential steering wheel, and the differential assembly is used for power distribution of the differential steering wheel, and is installed on the steering wheel base assembly through bearings and fixed sleeves; The driving wheel assembly is used for the running of the differential steering wheel, and the steering and swinging assembly is used for the steering and small-angle swing of the differential steering wheel.

5. The explosion-proof differential steering wheel system with caliper brake according to claim 4, characterized in that: The steering wheel base assembly includes a drive motor, a base, a motor input gear, a transmission gear, an output gear, a brake input gear, a bearing end cover, a gear box end cover, a base end cover, and a seal; The base is a bearing structure of the steering wheel, a driving motor is arranged on the base, a transmission gear is arranged outside the motor input gear, the transmission gear transmits the output of the motor to the output gear located in the middle of the base, and the other side of the transmission gear is a brake input gear; Each gear is provided with a bearing end cover, a sealing member is provided outside the bearing end cover, and the bearing end cover is fixed to the gear box end cover by screws.

6. The explosion-proof differential steering wheel system with caliper brake according to claim 4, characterized in that: The differential assembly comprises a differential, a bowl gear, and a differential input gear. The bowl gear is connected to the differential through screws; the differential input gear is fixed to the output gear through bearings, screws, and screw end covers.

7. The explosion-proof differential steering wheel system with caliper brakes according to claim 4, characterized in that: The driving wheel assembly includes a tire, a driving reducer, a transmission shaft, a fixed sleeve, and a seal; the driving reducer is located on the tire axis side, and the transmission shaft is connected between the driving reducer and the differential; the fixed sleeve is installed on the base assembly, and the fixed sleeve is embedded with the transmission shaft; the differential assembly is installed on the fixed sleeve through a bearing; the transmission shaft is connected to the differential assembly through a key.

8. The explosion-proof differential steering wheel system with caliper brakes according to claim 4, characterized in that: The steering swing assembly includes a steering motor, a steering reducer, a steering pinion, a slewing bearing, a mounting plate, a swing plate, a sliding bearing end cover, a mechanical limit block, and an explosion-proof proximity switch; the swing plate is divided into a left part and a right part, and is mounted on the base through a sliding bearing and a sliding bearing end cover; The slewing bearing and the mounting plate are mounted on the swing plate; the steering motor is mounted on the steering reducer; the steering reducer is mounted on the mounting plate; the steering pinion is mounted on the steering reducer; the mechanical limit block is mounted in the bottom groove of the slewing bearing; the explosion-proof proximity switch is fixed to the swing plate by threads.

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