Novel steering axle drum brake

Abstract

The invention provides a novel steering axle drum brake, which relates to the technical field of commercial vehicle braking and comprises a brake chamber, a positioning outer shell is mounted at the bottom of the brake chamber by matching with a bolt, a power line is mounted above the positioning outer shell, and a positioning inner shell is mounted on the inner side of the positioning outer shell; two symmetrically-distributed stabilizing frames are installed at the bottom of the positioning shell, and two symmetrically-distributed brake piston structures are installed between the positioning shell and the stabilizing frames. After air pressure is input into the drainage pipe, the brake arm can be rapidly pushed to expand outwards, rapid contact braking of the brake pad and a hub is achieved, after the air pressure is relieved, the brake arm can be rapidly reset under the action of the spring, the timeliness of the braking and resetting process is guaranteed, in addition, the two sets of brake piston structures are arranged, the brake pad moves transversely, and the braking effect is improved. The response speed of a braking system is increased, the braking time is effectively shortened, the vehicle driving safety is enhanced, and meanwhile the problem that a traditional brake pad is of a hinged structure is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of commercial vehicle brakes, in particular to a novel steering axle drum brake. Background Art

[0002] In the field of commercial vehicle braking systems, drum brakes are widely used in various types of trucks, buses, and construction vehicles due to their simple structure, low cost, and high braking torque. However, in actual use, traditional drum brakes have exposed many technical defects that need to be addressed, as follows:

[0003] In the field of commercial vehicle braking systems, traditional drum brakes use an articulated brake pad structure, which leads to brake pad response lag and uneven braking torque. This results in long emergency braking distances and is prone to localized wear of the brake pads, shortening their service life by more than 30%.

[0004] Currently, the brake pad clearance adjustment relies on manual operation, which increases labor and takes a long time to adjust. In addition, there are errors in the accuracy of the brake pad clearance adjustment.

[0005] In addition, the brake pads lack real-time wear monitoring methods and require the wheel hub to be disassembled for inspection, which can easily lead to the risk of excessive wear of the brake pads due to missed inspections. In addition, the thermal decay is significant during continuous braking, resulting in reduced braking performance stability. Summary of the Invention

[0006] The present invention relates to a novel steering axle drum brake. When braking is required, air pressure is input into the interior of a drainage pipe. Under the push of the pressure, two brake arms expand outward at the same time. When the brake arms expand outward, they push a stabilizing frame and a brake pad to move outward, so that the brake pad contacts the wheel hub and performs drum braking on the wheel hub. When clearance adjustment is required, an electric motor is controlled to start, and the driving shaft of the electric motor drives the driving bevel gear to rotate. Through engagement with the driven bevel gear, the threaded rod is driven to rotate in place. When the threaded rod rotates, due to its double-thread structure and the opposite spiral directions of the thread grooves on the inner sides of the adjustment arms, the two adjustment arms can be controlled to move synchronously in opposite directions. When the adjustment arms expand outward, the braking distance of the brake pads is fine-tuned, thereby realizing automatic adjustment of the brake pad clearance.

[0007] The present invention provides a new steering axle drum brake, which specifically includes: a brake air chamber, a positioning shell installed at the bottom of the brake air chamber with bolts, a power cord installed above the positioning shell, a positioning inner shell installed on the inner side of the positioning shell, two symmetrically distributed stabilizing frames installed at the bottom of the positioning shell, two groups of symmetrically distributed brake piston structures installed between the positioning shell and the stabilizing frames, two tension springs installed between the two stabilizing frames, two brake pads installed on the outer sides of the stabilizing frames, a group of mounting holes opened on the inner sides of the stabilizing frames, a friction sensor installed inside one of the mounting holes, one side of the friction sensor extending to the inside of the brake pad, and a group of gap adjustment mechanisms installed between the two stabilizing frames.

[0008] Furthermore, a stabilizing plate is installed on the upper portion of the positioning housing with the aid of bolts, a circular arc protrusion is provided in the middle portion of the stabilizing plate, and the bottom of the power cord extends to the inside of the circular arc protrusion.

[0009] Furthermore, a stabilizing seat is provided on one side of the positioning inner shell, and two positioning holes are respectively opened at the upper and lower positions of the stabilizing seat. The positioning hole is a cylindrical structure. A stabilizing sleeve is installed at the bottom position of the stabilizing seat, and a threaded connecting sleeve and a drainage tube are provided above the stabilizing sleeve. A ventilation valve is installed on the inner side of the threaded connecting sleeve, and the threaded connecting sleeve and the drainage tube respectively pass through the interior of the positioning hole.

[0010] Furthermore, a sealing plug and a brake arm are respectively installed on both sides of the drainage tube, and the brake arm passes through the interior of the sealing plug. The stabilizing sleeve, drainage tube, ventilation valve, sealing plug and brake arm cooperate with each other to form a brake piston structure. A sealing column is provided in the middle position of the brake arm, and the sealing column extends to the interior of the drainage tube. A group of annular grooves are opened on the outer side of the sealing column, and a sealing ring is respectively installed on the inner side of the annular groove. The outer side of the sealing ring contacts the inner wall of the drainage tube, a support spring is installed on the outer side of the brake arm, and a locking nut is installed above the drainage tube.

[0011] Furthermore, a push plate is provided on one side of the brake arm, the push plate is an arc structure, a positioning block is provided on the outer side of the push plate, a positioning groove is opened on both sides of the inner side of the stabilizing frame, and the positioning block extends to the inside of the positioning groove.

[0012] Furthermore, two symmetrically distributed positioning pins are installed on the inner side of the stabilizing frame, an annular groove is provided at the bottom of the positioning pins, and both sides of the tension spring are respectively installed on the inner side of the annular groove.

[0013] Furthermore, a first positioning sleeve is provided at the bottom of the positioning inner shell, and an electric motor is installed at the inner side of the first positioning sleeve.

[0014] Furthermore, a second positioning sleeve is installed at the bottom position of the electric motor, and a reinforcement sleeve is provided above the second positioning sleeve. The interior of the reinforcement sleeve is connected to the second positioning sleeve, and the upper part of the reinforcement sleeve extends to the interior of the electric motor. The drive shaft of the electric motor passes through the interior of the reinforcement sleeve, and a driving bevel gear is installed at the outer position of the drive shaft of the electric motor. A rotatably connected threaded rod is inserted into the interior of the second positioning sleeve, and a driven bevel gear is installed at the outer position of the threaded rod. The driving bevel gear and the driven bevel gear are meshed.

[0015] Furthermore, two symmetrically distributed adjusting arms are installed on the outer side of the threaded rod. The threaded rod has a double-thread structure. A thread groove is opened on the inner side of each adjusting arm. The spiral directions of the two thread grooves are opposite. One side of the adjusting arm extends to the interior of the second positioning sleeve. The electric motor, the second positioning sleeve, the threaded rod, and the adjusting arm cooperate with each other to form a gap adjustment mechanism.

[0016] Furthermore, a vertical positioning block is installed on each side of the adjustment arm, a mounting hole is opened on the inner side of the stabilizing frame, and the positioning block passes through the interior of the mounting hole.

[0017] Furthermore, an open slot is provided on one side of the adjusting arm.

[0018] The present invention provides a novel steering axle drum brake, which has the following beneficial effects:

[0019] In the brake piston structure of the present invention, air pressure is input into the drainage tube, which can quickly push the brake arm to expand outward, thereby achieving rapid contact and braking between the brake pad and the wheel hub. After the air pressure is released, the brake arm can be quickly reset under the action of the spring, ensuring the timeliness of the braking and reset process. In addition, the brake piston structure is arranged in two groups, which enables the brake pad to move laterally, improves the response speed of the braking system, effectively shortens the braking time, and enhances the driving safety of the vehicle. At the same time, it solves the problem of the traditional brake pad being a hinged structure and effectively avoids the problem of local wear of the brake pad.

[0020] In addition, the brake arm and the stabilizing frame are stably assembled through the positioning block. During the braking process, it can ensure that the brake pads apply braking force to the wheel hub stably, reducing shaking and deviation during braking, making the braking effect more stable and reliable, and improving the stability of the vehicle during braking.

[0021] The clearance adjustment mechanism drives the threaded rod to rotate through an electric motor. The double-thread structure and the reverse design of the thread groove on the inner side of the adjustment arm can realize the synchronous reverse movement of the two adjustment arms, accurately fine-tune the braking distance of the brake pads, and realize the automatic adjustment function of the distance. There is no need for frequent manual adjustment, which improves the adjustment efficiency and accuracy, ensures that the brake clearance is always within a reasonable range, and maintains good braking performance.

[0022] The friction sensor penetrates deep into the brake pad and can monitor the wear condition of the brake pad in real time. Once the brake pad is worn to a specific position, the friction sensor can promptly sense the change in end friction, reminding the operator to check and replace the brake pad in time, avoiding brake failure due to excessive wear of the brake pad, greatly improving the safety and reliability of the braking system.

[0023] Automatic clearance adjustment and wear alarm functions reduce the workload of manual inspection and adjustment, lower maintenance costs and difficulty, and improve the convenience of brake use and maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0025] The drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0026] In the attached figure:

[0027] Figure 1 It shows the axle-side structure schematic diagram of the drum brake of the present invention after assembly;

[0028] Figure 2 The present invention shows Figure 1 A schematic diagram of the axle-side structure from an upward perspective;

[0029] Figure 3 The present invention shows Figure 1 Schematic diagram of the structure viewed from above;

[0030] Figure 4 It shows a schematic diagram of the axle-side structure after the brake air chamber is removed according to the present invention;

[0031] Figure 5 A schematic diagram of the axial structure of the positioning housing cutaway structure of the present invention is shown;

[0032] Figure 6 It shows a schematic diagram of the axle-side structure after the brake pads are removed according to the present invention;

[0033] Figure 7 It shows a schematic diagram of the axial side structure of the stabilizing frame of the present invention when cut through and looking up;

[0034] Figure 8 The present invention shows Figure 7 Schematic diagram of the axle side structure from a top view angle;

[0035] Figure 9 An axial structural schematic diagram showing the brake piston structure and the cross-sectional structure of the clearance adjustment mechanism of the present invention is shown;

[0036] Figure 10It shows a schematic diagram of the vertical axis structure of the positioning inner shell of the present invention;

[0037] Figure 11 The present invention shows Figure 1 A schematic diagram of the enlarged structure.

[0038] Reference Signs List

[0039] 1. Brake air chamber; 101. Positioning housing;

[0040] 2. Power cord; 201. Stabilizing plate;

[0041] 3. Positioning inner shell; 301. First positioning sleeve;

[0042] 4. Brake piston structure; 401. Stabilizing sleeve; 402. Drainage tube; 403. Ventilation valve; 404. Sealing plug; 405. Brake arm;

[0043] 5. Stable frame; 501. Positioning pin;

[0044] 6. Extension spring;

[0045] 7. Brake pads;

[0046] 8. Friction sensor;

[0047] 9. Gap adjustment mechanism; 901. Electric motor; 902. Second positioning sleeve; 903. Threaded rod; 904. Adjustment arm. DETAILED DESCRIPTION

[0048] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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 described 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.

[0049] Example 1: Please refer to Figures 1 to 11 :

[0050] The present invention proposes a novel steering axle drum brake, comprising: a brake chamber 1, a positioning shell 101 is installed at the bottom of the brake chamber 1 with bolts, a power line 2 is installed above the positioning shell 101, a stabilizing plate 201 is installed above the positioning shell 101 with bolts, a circular arc protrusion is provided in the middle of the stabilizing plate 201, the bottom of the power line 2 extends to the inside of the circular arc protrusion, and the stabilizing plate 201 is installed to achieve the effect of tightening the bottom position of the power line 2, a positioning inner shell 3 is installed on the inner side of the positioning shell 101, and two pairs of positioning inner shells are installed at the bottom of the positioning shell 101. The fixed frame 5 is distributed, and two groups of symmetrically distributed brake piston structures 4 are installed between the positioning outer shell 101 and the fixed frame 5. A fixed seat is provided on one side of the positioning inner shell 3. Two positioning holes are respectively opened at the upper and lower positions of the fixed seat. The positioning hole is a cylindrical structure. A fixed sleeve 401 is installed at the bottom position of the fixed seat. A threaded connection sleeve and a drainage pipe 402 are provided above the fixed sleeve 401. A ventilation valve 403 is installed on the inner side of the threaded connection sleeve. The threaded connection sleeve and the drainage pipe 402 pass through the interior of the positioning hole respectively. The positioning hole cooperates with the threaded connection sleeve and the drainage pipe 402 to fix the fixed sleeve. 401 is positioned circumferentially and laterally, a sealing plug 404 and a brake arm 405 are respectively installed on both sides of the drainage tube 402, the brake arm 405 passes through the interior of the sealing plug 404, and the sealing plug 404 seals the brake arm 405 and the stable sleeve 401. The stable sleeve 401, the drainage tube 402, the ventilation valve 403, the sealing plug 404, and the brake arm 405 cooperate with each other to form a brake piston structure 4. A sealing column is provided in the middle of the brake arm 405, and the sealing column extends to the interior of the drainage tube 402. A group of annular grooves are provided on the outer side of the sealing column, and a The outer side of the sealing ring contacts the inner wall of the drainage tube 402. The setting of the sealing ring enhances the sealing performance of the sealing column. When air pressure is input into the drainage tube 402, the two brake arms 405 expand outward at the same time under the push of the pressure. A supporting spring is installed at the outer position of the brake arm 405. When the air pressure inside the drainage tube 402 is released, the brake arm 405 moves inward under the support of the spring. A locking nut is installed at the upper position of the drainage tube 402. A section of external thread corresponding to the locking nut is set at the upper position of the drainage tube 402. After the locking nut is installed, the position of the sleeve 401 is locked firmly.

[0051] When the brake arm 405 is reset, the stable frame 5 is reset at the same time under the action of the tension spring 6. Two symmetrically distributed positioning pins 501 are installed at the inner position of the stable frame 5, and an annular groove is provided at the bottom position of the positioning pin 501. Both sides of the tension spring 6 are respectively installed at the inner position of the annular groove. The annular groove positions the installation position of the tension spring 6. After the tension spring 6 is installed, the stable frame 5 and the brake pad 7 are stretched inward.

[0052] In this embodiment, a group of mounting holes are provided on the inner side of the stabilizing frame 5, a friction sensor 8 is installed inside one of the mounting holes, and the friction sensor 8 and the power line 2 are electrically connected with reference to the prior art. One side of the friction sensor 8 extends to the inside of the brake pad 7. When the brake pad 7 wears to the position of the friction sensor 8, the end of the friction sensor 8 will generate friction. A group of gap adjustment mechanisms 9 are also installed between the two stabilizing frames 5. A first positioning sleeve 301 is provided at the bottom position of the positioning inner shell 3, and an electric motor 901 is installed on the inner side of the first positioning sleeve 301. The friction positioning structure in the prior art is used to ensure that the electric motor 901 is firmly installed inside the first positioning sleeve 301, and a second positioning sleeve is installed at the bottom position of the electric motor 901. The second positioning sleeve 902 is provided with a reinforcement sleeve above the second positioning sleeve 902. The reinforcement sleeve is connected to the interior of the second positioning sleeve 902. The top of the reinforcement sleeve extends to the interior of the electric motor 901. The drive shaft of the electric motor 901 passes through the interior of the reinforcement sleeve. The reinforcement sleeve reinforces the drive shaft of the electric motor 901. In addition, the extension structure of the reinforcement sleeve also realizes the lateral positioning of the second positioning sleeve 902. A driving bevel gear is installed at the outer position of the drive shaft of the electric motor 901, and a rotatably connected threaded rod 903 is inserted into the interior of the second positioning sleeve 902. A driven bevel gear is installed at the outer position of the threaded rod 903. The driving bevel gear and the driven bevel gear are engaged, so that the electric motor 901 can be controlled to drive the threaded rod 903 to rotate in place.

[0053] In this embodiment, two symmetrically distributed adjustment arms 904 are installed on the outer side of the threaded rod 903. The threaded rod 903 has a double-thread structure. A thread groove is respectively provided on the inner side of the adjustment arm 904. The spiral directions of the two thread grooves are opposite. One side of the adjustment arm 904 extends to the inside of the second positioning sleeve 902. When the threaded rod 903 rotates, it can control the two adjustment arms 904 to move synchronously in opposite directions. The electric motor 901, the second positioning sleeve 902, the threaded rod 903, and the adjustment arm 904 cooperate with each other to form a gap adjustment mechanism 9 A vertical positioning block is installed on one side of the adjusting arm 904, and a mounting hole is opened on the inner side of the stabilizing frame 5. The positioning block passes through the inside of the mounting hole. The positioning block cooperates with the mounting hole to achieve the positioning effect of one side of the adjusting arm 904. Therefore, the adjusting arm 904 can fine-tune the brake spacing of the brake pad 7 when expanding outward, and cooperate with the electric motor 901 to realize automatic adjustment of the brake pad 7. An open groove is opened on one side of the adjusting arm 904. The setting of the open groove facilitates the brake piston structure 4 and the gap adjustment mechanism 9 to control the movement of the brake pad 7 respectively.

[0054] Example 2, based on Example 1, Figures 1-10 As shown, a plug is provided above the power cord 2, and a friction alarm needs to be set. The model of the friction alarm is selected according to actual needs, and the friction alarm and the plug of the power cord 2 are electrically connected. When the brake pad 7 is worn to a thickness that requires replacement, the friction sensor 8 can transmit the friction force to the friction alarm in time, and then the friction alarm alarms, completing the step of automatic alarm for brake pad 7 wear.

[0055] Example 3, based on Example 1, Figures 1-10 As shown, the upper portion of the drainage pipe 402 is connected to the brake air chamber 1 with reference to the prior art.

[0056] The working principle of this embodiment is as follows:

[0057] Use bolts to install the positioning shell 101 on the bottom of the brake air chamber 1, install the power cord 2 above the positioning shell 101, and press its bottom with the stabilizing plate 201, install the positioning inner shell 3 on the inside of the positioning shell 101, install two symmetrically distributed stabilizing frames 5 at its bottom, and install two groups of symmetrically distributed brake piston structures 4 between the positioning shell 101 and the stabilizing frames 5, install two tension springs 6 between the two stabilizing frames 5, install two brake pads 7 on the outside of the stabilizing frames 5, and install the friction sensor 8 in the mounting hole on the inside of the stabilizing frame 5 so that one side extends to the inside of the brake pad 7, and electrically connect the friction sensor 8 to the power cord 2, and electrically connect the selected model of friction alarm to the plug of the power cord 2;

[0058] Install the gap adjustment mechanism 9 between the two stabilizing frames 5, including installing the electric motor 901 in the first positioning sleeve 301 using a friction positioning structure, installing the second positioning sleeve 902 to ensure that it reinforces and laterally positions the drive shaft of the electric motor 901, installing the threaded rod 903 and engaging it with the driving bevel gear of the electric motor 901, installing two symmetrically distributed adjustment arms 904 on the outside of the threaded rod 903, and positioning the positioning blocks on one side of the adjustment arms 904 through the mounting holes on the inside of the stabilizing frame 5;

[0059] Install a sealing plug 404 and a brake arm 405 on both sides of the drainage tube 402, ensuring that the sealing plug 404 seals the brake arm 405 and the stabilizing sleeve 401. The sealing post of the brake arm 405 extends into the interior of the drainage tube 402, and the sealing ring enhances its sealing performance. Use a positioning block to stably assemble the brake arm 405 and the stabilizing frame 5. Install a locking nut above the drainage tube 402 to lock the stabilizing sleeve 401 in place.

[0060] When braking is required, air pressure is input into the drainage tube 402. Under the pressure, the two brake arms 405 expand outward at the same time. When the brake arms 405 expand outward, they push the stabilizing frame 5 and the brake pads 7 to move outward. The brake pads 7 come into contact with the wheel hub, and the wheel hub is subjected to drum braking.

[0061] When braking is completed, the air pressure inside the drainage tube 402 is released, the brake arm 405 moves inward and resets under the action of the outer support spring, and the stabilizing frame 5 is reset at the same time under the action of the tension spring 6, and the brake pad 7 is separated from the wheel hub;

[0062] According to the actual braking situation, if it is found that the braking effect is not good or the gap is too large and the gap needs to be adjusted, the electric motor 901 is controlled to start, and the driving shaft of the electric motor 901 drives the driving bevel gear to rotate, and through the engagement with the driven bevel gear, the threaded rod 903 is driven to rotate in place. When the threaded rod 903 rotates, due to its double-thread structure and the opposite spiral directions of the inner thread grooves of the adjustment arms 904, the two adjustment arms 904 can be controlled to move synchronously in opposite directions. When the adjustment arms 904 expand outward, the braking distance of the brake pads 7 is fine-tuned, thereby realizing automatic adjustment of the gap of the brake pads 7;

[0063] During use, when the brake pad 7 is worn to a thickness that requires replacement, the friction sensor 8 will sense the friction generated at the end and transmit the friction force to the friction alarm. After the friction alarm sounds, check the wear of the brake pad 7 in time. If it is confirmed that it has reached the replacement standard, replace the brake pad 7 according to the corresponding steps.

Claims

1. A new type of steering axle drum brake, comprising: A brake air chamber (1), a brake piston structure (4) and a gap adjustment mechanism (9), wherein a positioning shell (101) is installed at the bottom position of the brake air chamber (1) with a bolt, a power line (2) is installed above the positioning shell (101), and a positioning inner shell (3) is installed on the inner side of the positioning shell (101), characterized in that two symmetrically distributed stabilizing frames (5) are installed at the bottom position of the positioning shell (101), two groups of symmetrically distributed brake piston structures (4) are installed between the positioning shell (101) and the stabilizing frames (5), two tension springs (6) are installed between the two stabilizing frames (5), two brake pads (7) are installed on the outer side of the stabilizing frame (5), a group of heat dissipation grooves are opened on the outer side of the stabilizing frame (5), a group of mounting holes are opened on the inner side of the stabilizing frame (5), a friction sensor (8) is installed inside one of the mounting holes, one side of the friction sensor (8) extends to the inside of the brake pad (7), and a group of gap adjustment mechanisms (9) are also installed between the two stabilizing frames (5).

2. A new steering axle drum brake according to claim 1, characterized in that: A stabilizing plate (201) is mounted on the upper portion of the positioning housing (101) with bolts, and a circular arc protrusion is provided in the middle of the stabilizing plate (201), and the bottom of the power cord (2) extends to the inside of the circular arc protrusion.

3. The novel steering axle drum brake according to claim 1 is characterized in that: A stabilizing seat is provided on one side of the positioning inner shell (3), and two positioning holes are respectively provided at the upper and lower positions of the stabilizing seat. The positioning holes are cylindrical structures. A stabilizing sleeve (401) is installed at the bottom position of the stabilizing seat. A threaded connection sleeve and a drainage tube (402) are provided above the stabilizing sleeve (401). A ventilation valve (403) is installed on the inner side of the threaded connection sleeve. The threaded connection sleeve and the drainage tube (402) respectively pass through the interior of the positioning holes.

4. A new steering axle drum brake according to claim 3, characterized in that: A sealing plug (404) and a brake arm (405) are respectively installed on both sides of the drainage tube (402). The brake arm (405) passes through the interior of the sealing plug (404). The stabilizing sleeve (401), the drainage tube (402), the ventilation valve (403), the sealing plug (404), and the brake arm (405) cooperate with each other to form a brake piston structure (4). A sealing column is provided in the middle position of the brake arm (405). The sealing column extends to the interior of the drainage tube (402). A group of annular grooves are provided on the outer side of the sealing column. A sealing ring is respectively installed on the inner side of the annular groove. The outer side of the sealing ring contacts the inner wall of the drainage tube (402). A supporting spring is installed on the outer side of the brake arm (405), and a locking nut is installed above the drainage tube (402).

5. The novel steering axle drum brake according to claim 4 is characterized in that: A push plate is provided on one side of the brake arm (405), and the push plate is an arc structure. A positioning block is provided on the outer side of the push plate. A positioning groove is provided on both sides of the inner side of the stabilizing frame (5), and the positioning block extends into the interior of the positioning groove.

6. The novel steering axle drum brake according to claim 1 is characterized in that: Two symmetrically distributed positioning pins (501) are installed on the inner side of the stabilizing frame (5), and an annular groove is provided at the bottom of the positioning pin (501). Both sides of the tension spring (6) are respectively installed on the inner side of the annular groove.

7. The novel steering axle drum brake according to claim 1 is characterized in that: A first positioning sleeve (301) is provided at the bottom of the positioning inner shell (3), an electric motor (901) is installed at the inner side of the first positioning sleeve (301), a second positioning sleeve (902) is installed at the bottom of the electric motor (901), a reinforcement sleeve is provided above the second positioning sleeve (902), the interiors of the reinforcement sleeve and the second positioning sleeve (902) are communicated, the upper side of the reinforcement sleeve extends to the interior of the electric motor (901), the driving shaft of the electric motor (901) passes through the interior of the reinforcement sleeve, a driving bevel gear is installed at the outer side of the driving shaft of the electric motor (901), a threaded rod (903) for rotational connection is inserted into the interior of the second positioning sleeve (902), a driven bevel gear is installed at the outer side of the threaded rod (903), and the driving bevel gear and the driven bevel gear are meshed.

8. The novel steering axle drum brake according to claim 7 is characterized in that: Two symmetrically distributed adjusting arms (904) are installed on the outer side of the threaded rod (903). The threaded rod (903) has a double-thread structure. A thread groove is respectively provided on the inner side of the adjusting arm (904). The spiral directions of the two thread grooves are opposite. One side of the adjusting arm (904) extends to the interior of the second positioning sleeve (902). The electric motor (901), the second positioning sleeve (902), the threaded rod (903), and the adjusting arm (904) cooperate with each other to form a gap adjustment mechanism (9).

9. The novel steering axle drum brake according to claim 8, characterized in that: A vertical positioning block is installed on one side of the adjusting arm (904), a mounting hole is opened on the inner side of the stabilizing frame (5), the positioning block passes through the inside of the mounting hole, and an open slot is opened on one side of the adjusting arm (904).

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