Parking braking system teaching aid

Abstract

The utility model discloses a parking braking system teaching aid which comprises a supporting frame and a parking braking component. Wherein the supporting frame is fixedly arranged on the teaching ground and can conveniently move on the teaching ground; the parking braking component is fixedly arranged at the upper end and the interior of the supporting frame according to the installation condition of the parking braking component in an actual vehicle; the teaching aid provided by the utility model effectively reproduces the working principle and the structural layout of an actual vehicle parking brake system according to the configuration mode in an actual vehicle, maintenance personnel can directly observe and operate the parts, the actual operation skill and maintenance capability are improved, and meanwhile, the teaching aid is convenient to use. Maintenance personnel learn and get familiar with the parking brake system in a safe teaching environment, risks and dangers possibly faced during maintenance on an actual vehicle are reduced, in addition, the open design of the teaching aid enables the teaching aid to be suitable for team training, promotes knowledge sharing and team cooperation, improves the maintenance level of the whole team, and improves the maintenance efficiency of the whole team. Therefore, the teaching efficiency and quality are improved.

Description

Technical Field

[0001] The embodiments of the present utility model belong to the technical field of automotive teaching aids, and more specifically, relate to a parking brake system teaching aid. Background Art

[0002] With the rapid development of the automotive industry, the safety performance of vehicles has been increasingly emphasized. As an important part of vehicle safety, the parking brake system is used to lock the wheels when the vehicle is parked, preventing accidents caused by the vehicle accidentally sliding or rolling, especially playing a key role when parking on a slope. Since the parking brake system is directly related to the safety and reliability of the vehicle, road safety, and the life and property safety of drivers and passengers, it is particularly important to perform effective maintenance and repair on it. However, the parking brake system usually consists of a series of mechanical components, such as a handbrake lever, a cable, a brake, etc., resulting in relatively complex maintenance and repair work, which poses relatively high requirements for the professional skills and practical experience of maintenance personnel. Therefore, a large number of maintenance personnel familiar with its mechanical structure and working principle are required to perform daily maintenance and fault repair to ensure the safety performance of the vehicle.

[0003] Traditional maintenance materials and training textbooks are mainly based on paper carriers and teaching videos. This one-way information transmission method lacks interactivity and practicality, and it is difficult to meet the actual operation experience required by maintenance personnel for the maintenance and troubleshooting of the parking brake system. Secondly, since the cost of using real vehicles for practical training is high and time-consuming, this approach is not conducive to quickly training a large number of maintenance personnel. In addition, frequent disassembly of the vehicle to understand its internal structure may cause damage to the vehicle and increase the maintenance cost. With the continuous development of the automotive industry, the technology and design of the parking brake system are also constantly evolving. It is inconvenient to update paper carriers and teaching videos, and it is difficult to reflect the latest technological changes and repair methods in a timely manner. At the same time, there may be safety hazards when using actual vehicles for maintenance training without proper supervision. Novice maintenance personnel may cause accidental injuries or equipment damage when operating without sufficient guidance. On the other hand, the sharing of traditional textbooks and resources is limited by physical distribution, which restricts the rapid dissemination and wide sharing of knowledge, especially in remote areas or resource-poor environments. Modern educational concepts emphasize the combination of practice and theory, immersive learning, and interactive teaching. The existing training methods for the parking brake system fail to fully utilize these modern educational technologies, which may affect the learning effect. In addition, since different regions may adopt different training standards and methods, this may lead to uneven skill levels of maintenance personnel, affecting the unity and reliability of service quality. Therefore, there is an urgent need for a training bench that can efficiently simulate the parking brake system of a real vehicle to provide comprehensive practical experience and skill training for maintenance personnel. Summary of the Utility Model

[0004] In view of the above deficiencies or improvement requirements of the prior art, the present utility model provides a teaching aid for a parking brake system, which effectively reproduces the working principle and structural layout of the parking brake system in an actual vehicle according to the configuration method in the actual vehicle. When using this teaching aid for teaching, maintenance personnel can directly observe and operate these components, improving their practical operation skills and maintenance capabilities. At the same time, maintenance personnel can learn and become familiar with the working principle of the parking brake system in a safe teaching environment, reducing the risks and hazards that may be faced during maintenance on an actual vehicle. Secondly, maintenance personnel can detect and eliminate faults through operation and observation, improving their fault diagnosis and maintenance capabilities. In addition, the open design of the teaching aid makes it suitable for team training, and multiple maintenance personnel can participate in the operation and discussion together, promoting knowledge sharing and teamwork, and improving the maintenance level of the entire team, thereby improving the teaching efficiency and quality.

[0005] To achieve the above object, the present utility model provides a teaching aid for a parking brake system, including: a support frame and parking brake components, wherein:

[0006] The support frame includes: a first frame, a first bracket, and a second frame; the first frame is fixedly arranged at the upper part of the support frame and a cross beam is fixedly arranged in the middle; both upper ends of several first brackets are fixedly arranged at the bottom end of the first frame, and the outer sides of both lower ends are respectively fixedly connected to the inner sides of the corresponding second frames;

[0007] The parking brake components include: a rear axle main reducer, a brake, a handwheel, a caliper bracket, a spring air chamber, a brake handle, and an auxiliary air storage cylinder assembly; the rear axle main reducer is fixedly arranged at the upper right side of the first frame through several second brackets; the brake is fixedly arranged at the upper end of the first frame; the handwheel is fixedly arranged on the left side of the brake; the caliper bracket is fixedly connected to the caliper; the spring air chamber is fixedly arranged on the left side of the caliper and is fixedly connected to the caliper; the brake handle is fixedly arranged at the outer side of the upper end of the first frame through a fourth bracket; the auxiliary air storage cylinder assembly is fixedly arranged inside the support frame.

[0008] Furthermore, the support frame includes a roller component; the roller component includes a first roller and a second roller; the first roller is fixedly arranged at the bottom end of the left top corner of the second frame, and it is a universal wheel with a locking device; the second roller is fixedly arranged at the bottom end of the right top corner of the second frame, and it is a directional wheel.

[0009] Furthermore, the first frame, the first bracket, and the second frame are mainly made of aluminum profiles, and the cross-sectional dimension is from 70mm×70mm to 90mm×90mm.

[0010] Furthermore, the auxiliary air storage cylinder assembly includes an air source connector; the air source connector is fixedly arranged at the upper left side of the second frame.

[0011] Further, the brake handle is fixedly connected to the spring air chamber and the auxiliary air storage cylinder assembly respectively through air pipes.

[0012] Further, the bottom end of the front side of the fourth bracket is fixedly connected to the upper end of the first frame, and a through hole adapted to the brake handle is fixedly provided at the rear side.

[0013] Further, the parking brake component includes: a fifth bracket, a sixth bracket and a flexible belt; the fifth bracket is fixedly arranged at the upper end of the cross beam of the first bracket on the front side, and a triangular rib plate is fixedly provided at the connection with the first bracket; several sixth brackets are respectively fixedly arranged at the rear side of the fifth bracket and the rear side of the left end of the first bracket on the front side; both ends of the flexible belt are fixedly connected to the upper end and the bottom end of the sixth bracket respectively.

[0014] Further, the parking brake component includes: a third bracket; the outer side of the upper end of the long side of the third bracket is fixedly connected to the caliper bracket, the bottom end of its short side is fixedly connected to the upper end of the cross beam, and the inner corner of the third bracket faces away from the caliper bracket.

[0015] Further, the parking brake component includes: a second bracket; the inner side of the upper end of the long side of the second bracket is fixedly connected to the rear axle main reducer, and the overall contour of its upper end is adapted to the structure of the rear axle main reducer at the connection, the bottom end of its short side is fixedly connected to the upper end of the first frame and is fixedly arranged below the rear axle main reducer.

[0016] Further, the brake includes: a brake disc; the brake disc is fixedly arranged on the left side of the rear axle main reducer and is fixedly connected to the hand crank, and the caliper is fixedly arranged on the front side of the brake disc and is movably connected to the brake disc.

[0017] Generally speaking, compared with the prior art by the above technical solutions conceived by the present utility model, the following beneficial effects can be achieved:

[0018] (1) The teaching aid of the present utility model effectively reproduces the working principle and structural layout of the parking brake system of an actual vehicle by fixedly installing the parking brake components at the upper end and inside of the support frame according to the configuration mode in the actual vehicle. When using this teaching aid for teaching, maintenance personnel can directly observe and operate these components, improving their practical operation skills and maintenance capabilities. At the same time, maintenance personnel can learn and become familiar with the working principle of the parking brake system in a safe teaching environment, reducing the risks and dangers that may be faced during maintenance on an actual vehicle. Secondly, maintenance personnel can detect and troubleshoot faults through operation and observation, improving their fault diagnosis and maintenance capabilities. In addition, the open design of the teaching aid makes it suitable for team training, and multiple maintenance personnel can jointly participate in the operation and discussion, promoting knowledge sharing and teamwork, and improving the maintenance level of the entire team, thereby improving the teaching efficiency and quality.

[0019] (2) The teaching aid of the present utility model conveniently simulates the scenario where the wheel drives the brake disc to rotate in an actual vehicle through the hand crank, improving the use safety of the parking brake teaching aid.

[0020] (3) The teaching aid of the present utility model realizes the convenient movement of the teaching aid by installing roller components at the bottom of the support frame, improving the flexibility and convenience of the teaching aid. At the same time, the use safety of the teaching aid is further enhanced by installing the first roller.

[0021] (4) The teaching aid of the present utility model further enhances the stability and service life of the device by adding rib plates at several joints of the support frame. Description of the Drawings

[0022] Figure 1 is the front view of the teaching aid in the embodiment of the present utility model;

[0023] Figure 2 is the left view of the teaching aid in the embodiment of the present utility model;

[0024] Figure 3 is the right view of the teaching aid in the embodiment of the present utility model;

[0025] Figure 4 is the top view of the teaching aid in the embodiment of the present utility model.

[0026] In all the drawings, the same reference numerals denote the same technical features, specifically: 1 - support frame, 101 - first frame, 101a - cross beam, 102 - first bracket, 103 - second frame, 104 - roller assembly, 104a - first roller, 104b - second roller, 2 - rear axle main reducer, 3 - second bracket, 4 - brake, 401 - brake disc, 402 - caliper, 5 - handwheel, 6 - caliper bracket, 7 - third bracket, 8 - spring chamber, 9 - brake handle, 10 - fourth bracket, 11 - fifth bracket, 12 - sixth bracket, 13 - flexible belt, 14 - auxiliary air storage tank assembly, 1401 - air source connector. Detailed implementation manners

[0027] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. In addition, the technical features involved in the various implementation manners of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0028] As Figures 1 to 4 shown, an embodiment of the present utility model provides a teaching aid for a parking brake system, including: a support frame 1 and a parking brake component; wherein, the support frame 1 is fixedly arranged on the teaching ground and can be conveniently moved on the teaching ground; the parking brake component is fixedly arranged at the upper end and inside of the support frame 1 with reference to the installation situation of the parking brake component in an actual vehicle; the teaching aid of the present utility model fixedly installs the parking brake component at the upper end and inside of the support frame 1 according to the configuration mode in an actual vehicle, effectively reproducing the working principle and structural layout of the parking brake system of an actual vehicle. By using this teaching aid for teaching, maintenance personnel can directly observe and operate these components, improving their practical operation skills and maintenance capabilities. At the same time, maintenance personnel learn and familiarize themselves with the working principle of the parking brake system in a safe teaching environment, reducing the risks and dangers that may be faced during maintenance on an actual vehicle. Secondly, maintenance personnel can detect and eliminate faults through operation and observation, improving their fault diagnosis and maintenance capabilities. In addition, the open design of the teaching aid makes it suitable for team training, and multiple maintenance personnel can jointly participate in the operation and discussion, promoting knowledge sharing and teamwork, and improving the maintenance level of the entire team, thereby improving the teaching efficiency and quality.

[0029] Specifically, as Figures 1 to 4 shown, the support frame 1 is used to support other components, and its overall is a rectangular frame body, which includes a first frame 101, a first bracket 102, a second frame 103 and a roller assembly 104;

[0030] The first frame 101 is a rectangular frame as a whole, which is fixedly arranged on the upper part of the support frame 1 and is used to support the parking brake component. A cross beam 101a is fixedly arranged in the middle thereof, and triangular gusset plates are fixedly arranged on both sides of the connection between the cross beam 101a and the inner sides of both sides of the first frame 101;

[0031] The first bracket 102 is a concave frame as a whole. The upper ends of both sides thereof are fixedly arranged at the bottom end of the first frame 101, and the outer sides of the lower ends of both sides are respectively fixedly connected with the inner sides of the corresponding second frames 103, and are used to support the first frame 101;

[0032] Preferably, triangular gusset plates are fixedly arranged at the connections between both sides of the first bracket 102 and the first frame 101, and triangular gusset plates are fixedly arranged on the inner sides of the connections between both sides of the first bracket 102 and its bottom edge. The triangular gusset plates are used to improve the stability and service life of the device;

[0033] The second frame 103 is a rectangular frame as a whole, which is fixedly arranged on the outer side of the lower end of the first bracket 102 and is used to support the first bracket 102;

[0034] Preferably, the length of the long side of the second frame 103 is greater than the length of the long side of the first frame 101 to facilitate the pushing and transferring of the teaching aid;

[0035] Preferably, the first frame 101, the first bracket 102, and the second frame 103 are mainly made of aluminum profiles, and the cross-sectional dimension is from 70mm×70mm to 90mm×90mm;

[0036] As Figure 1 shown, the roller component 104 is fixedly arranged at the bottom end of the top corner of the second frame 103 to realize the convenient movement of the teaching aid, improve the flexibility and convenience of the teaching aid, and it includes: a first roller 104a and a second roller 104b;

[0037] The first roller l04a is fixedly arranged at the bottom end of the left top corner of the second frame 103, and it is a universal wheel with a locking device to further enhance the use safety of the teaching aid;

[0038] The first roller l04b is fixedly arranged at the bottom end of the right top corner of the second frame 103, and it is a directional wheel;

[0039] Preferably, the roller component 104 is mainly made of nylon rollers to adapt to the weight of the parking brake component and ensure the use stability of the teaching aid;

[0040] Specifically, as Figures 1 to 4As shown, the parking brake component is fixedly arranged at the upper end and inside of the support frame 1 based on the physical object of the parking brake system of the Mengshi B platform vehicle model, and is used for immersive and interactive training and teaching of the parking brake system of this vehicle model. It includes: rear axle main reducer 2, second bracket 3, brake 4, handwheel 5, caliper bracket 6, third bracket 7, spring chamber 8, brake handle 9, fourth bracket 10, fifth bracket 11, sixth bracket 12, flexible belt 13 and auxiliary air storage cylinder assembly 14;

[0041] The rear axle main reducer 2 is fixedly arranged at the upper right side of the upper end of the first frame 101 through a plurality of the second brackets 3, and is used for controlling the reduction of speed, increasing torque and changing the power output direction;

[0042] Preferably, the second bracket 3 is an L-shaped bracket as a whole. The inner side of the long side's upper end is fixedly connected to the rear axle main reducer 2, and the overall contour of its upper end is adapted to the structure of the rear axle main reducer 2 at the connection part, realizing immersive learning of the parking brake system and enhancing connection stability. The bottom end of its short side is fixedly connected to the upper end of the first frame 101 and is fixedly arranged below the rear axle main reducer 2, making the inner corner of the second bracket 3 face the rear axle main reducer 2, and is used for reasonably distributing the use area of the upper end of the first frame 101 and saving space;

[0043] As Figure 4 shown, the brake 4 is fixedly arranged at the upper end of the first frame 101, and is used for locking the wheels after the parking command is issued. It includes a brake disc 401 and a caliper 402;

[0044] The brake disc 401 is fixedly arranged on the left side of the rear axle main reducer 2 and is fixedly connected to the rear axle main reducer 2. In an actual vehicle, it is fixedly arranged on the wheel and rotates with the wheel. In this teaching aid, it is used to simulate the rotation and braking conditions of the vehicle wheel;

[0045] The handwheel 5 is fixedly arranged on the left side of the brake 4 and is fixedly connected to the middle part of the outer side of the brake disc 401 through a connecting rod. It includes a three-rib handwheel and a hand crank fixedly arranged at one end of the connecting rod. Through the handwheel 5, the scene where the wheel drives the brake disc 401 to rotate in an actual vehicle can be conveniently simulated, improving the use safety of this teaching aid;

[0046] As Figure 1 and Figure 4 shown, the caliper 402 is fixedly arranged on the front side of the brake disc 401 and is movably connected to the brake disc 401, and is used for locking the brake disc 401;

[0047] The caliper bracket 6 is integrally a concave block, and its inner sides at both ends are fixedly connected to the caliper 402, and it is fixedly arranged at the middle part of the upper end of the first frame 101 through the third bracket 7, and it is used to keep the caliper 402 stable in an actual vehicle;

[0048] Preferably, the third bracket 7 is integrally an L-shaped bracket, the outer side of the upper end of its long side is fixedly connected to the caliper bracket 6, the bottom end of its short side is fixedly connected to the upper end of the cross beam 101a, and the inner corner of the third bracket 7 faces away from the caliper bracket 6, and it is used to keep the caliper 402 stable when the spring air chamber 8 acts on the caliper 402;

[0049] The spring air chamber 8 is fixedly arranged on the left side of the caliper 402 and is fixedly connected to the caliper 402, and it is used to control the caliper 402 to brake the brake disc 401;

[0050] The brake handle 9 is fixedly arranged on the outer side of the upper end of the first frame 101 through the fourth bracket 10, and is fixedly connected to the spring air chamber 8 and the auxiliary air storage cylinder assembly 14 respectively through air pipes, and it is used to control the entire parking brake process;

[0051] Preferably, the fourth bracket 10 is integrally a rectangular block, the bottom end of its front side is fixedly connected to the upper end of the first frame 101, and a through hole adapted to the brake handle 9 is fixedly arranged on the rear side, so as to stably fix the brake handle 9 conveniently;

[0052] The fifth bracket 11 is fixedly arranged on the upper end of the cross beam of the front first bracket 102, and a triangular rib plate is fixedly arranged at the connection with the first bracket 102, and its cross-sectional dimension is from 70mm×70mm to 90mm×90mm;

[0053] The sixth bracket 12 is a folding plate with a horizontal outer side and an arc-shaped inner side. A plurality of the sixth brackets 12 are respectively fixedly arranged on the rear side of the fifth bracket 11 and the rear side of the left end of the front first bracket 102, and the horizontal positions of a plurality of the sixth brackets 12 correspond to each other;

[0054] Both ends of the flexible belt 13 are respectively fixedly connected to the upper end and the bottom end of the sixth bracket 12, and it cooperates with the sixth bracket 12 to flexibly fix the auxiliary air storage cylinder assembly 14 to avoid damage to the auxiliary air storage cylinder assembly 14;

[0055] The auxiliary air storage cylinder assembly 14 is fixedly arranged inside the support frame 1, and is fixedly arranged on the rear side of the sixth bracket 12 through the flexible belt 13, and is used to store the gas compressed from the air source for braking; the left side of the auxiliary air storage cylinder assembly 14 is fixedly connected to the brake handle 9 through an air pipe, and it includes an air source connector 1401;

[0056] The air source connector 1401 is fixedly arranged at the upper left end of the second frame 103 and is used to connect with an air source to provide the braking power for the teaching aid.

[0057] Preferably, the rear axle main reducer 2, the brake 4, the caliper bracket 6, the spring brake chamber 8 and the brake handle 9 are all original parts of the parking brake system of the Mengshi B platform vehicle model.

[0058] The working principle of this new teaching aid is as follows: Based on the physical object of the parking brake system of the Mengshi B platform vehicle model, the parking brake components are fixedly arranged at the upper end and inside of the support frame 1; by connecting the air source, the hand crank 5 is used to simulate the rotation of the wheel to drive the brake disc 401, and the brake handle 9 is used to control the auxiliary air storage tank assembly 14 and the spring brake chamber 8 to make the caliper 402 brake the brake disc 401, so as to realize the simulation of the parking braking process; maintenance personnel can observe and understand the working principles and interactions between various components, and learn how to correctly install, adjust and maintain the parking brake system; the design of the teaching aid enables maintenance personnel to be familiar with different components of the parking brake system, understand their functions and roles, so as to learn how to correctly install each component of the parking brake system, and how to adjust components such as the brake handle and caliper bracket to ensure the normal operation of the brake and adjust the braking force; by simulating the real parking brake system, a practical operation and practice platform is provided for maintenance personnel, enabling them to learn and be familiar with the usage method, maintenance and troubleshooting of the parking brake system, and providing comprehensive practical experience and skill training for maintenance personnel.

[0059] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then such directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0060] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0061] In this patent, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus. Without further limitation, an element defined by the statement "comprising..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. It is easy for those skilled in the art to understand that the above description is only a preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A parking brake system teaching aid, characterized in that: include: Support frame (1) and parking brake components, wherein: The support frame (1) comprises: a first frame (101), a first bracket (102) and a second frame (103); the first frame (101) is fixedly arranged on the upper part of the support frame (1) and a crossbeam (101a) is fixedly arranged in the middle part; the upper ends of the first brackets (102) are fixedly arranged on the bottom end of the first frame (101) and the outer sides of the lower ends of the two sides are respectively fixedly connected to the inner sides of the corresponding second frames (103); The parking brake component comprises: a rear axle main reducer (2), a brake (4), a hand wheel (5), a caliper bracket (6), a spring air chamber (8), a brake handle (9) and an auxiliary air reservoir assembly (14); the rear axle main reducer (2) is fixedly arranged on the right side of the upper end of the first frame (101) through a plurality of second brackets (3); the brake (4) is fixedly arranged on the upper end of the first frame (101); the hand wheel (5) is fixedly arranged on the left side of the brake (4); the caliper bracket (6) is fixedly connected to the caliper (402); the spring air chamber (8) is fixedly arranged on the left side of the caliper (402) and is fixedly connected to the caliper (402); the brake handle (9) is fixedly arranged on the outer side of the upper end of the first frame (101) through a fourth bracket (10); and the auxiliary air reservoir assembly (14) is fixedly arranged inside the support frame (1).

2. The teaching aid according to claim 1, characterized in that: The support frame (1) comprises a roller component (104); the roller component (104) comprises a first roller (104a) and a second roller (104b); the first roller (104a) is fixedly arranged at the bottom end of the left top corner of the second frame (103), and is a universal wheel with a locking device; the second roller (104b) is fixedly arranged at the bottom end of the right top corner of the second frame (103), and is a directional wheel.

3. The teaching aid according to claim 1, characterized in that: The first frame (101), the first bracket (102), and the second frame (103) are mainly made of aluminum profiles, and the cross-sectional dimensions are 70 mm×70 mm to 90 mm×90 mm.

4. The teaching aid according to any one of claims 1 to 3, characterized in that: The auxiliary air storage cylinder assembly (14) comprises an air source connector (1401); the air source connector (1401) is fixedly arranged at the upper left end of the second frame (103).

5. The teaching aid according to any one of claims 1 to 3, characterized in that: The brake handle (9) is fixedly connected to the spring air chamber (8) and the auxiliary air reservoir assembly (14) respectively through air pipes.

6. The teaching aid according to any one of claims 1 to 3, characterized in that: The front bottom end of the fourth bracket (10) is fixedly connected to the upper end of the first frame (101), and a through hole matching the brake handle (9) is fixedly provided on the rear side.

7. The teaching aid according to any one of claims 1 to 3, characterized in that: The parking brake component comprises: a fifth bracket (11), a sixth bracket (12) and a flexible belt (13); the fifth bracket (11) is fixedly arranged on the upper end of the cross beam of the first bracket (102) on the front side and a triangular rib is fixedly arranged at the connection with the first bracket (102); a plurality of sixth brackets (12) are respectively fixedly arranged on the rear side of the fifth bracket (11) and the rear side of the left end of the first bracket (102) on the front side; and the two ends of the flexible belt (13) are respectively fixedly connected to the upper end and the bottom end of the sixth bracket (12).

8. The teaching aid according to any one of claims 1 to 3, characterized in that: The parking brake component comprises: a third bracket (7); the outer side of the upper end of the long side of the third bracket (7) is fixedly connected to the caliper bracket (6), the bottom end of the short side is fixedly connected to the upper end of the cross beam (101a), and the inner corner of the third bracket (7) faces away from the caliper bracket (6).

9. The teaching aid according to any one of claims 1 to 3, characterized in that: The parking brake component comprises: a second bracket (3); the inner side of the upper end of the long side of the second bracket (3) is fixedly connected to the rear axle main reducer (2), and the overall contour of the upper end is adapted to the structure of the rear axle main reducer (2) at the connection, and the bottom end of the short side is fixedly connected to the upper end of the first frame (101) and is fixedly arranged below the rear axle main reducer (2).

10. The teaching aid according to any one of claims 1 to 3, characterized in that: The brake (4) comprises: a brake disc (401); the brake disc (401) is fixedly arranged on the left side of the rear axle main reducer (2) and is fixedly connected to the hand-cranked wheel (5); and the caliper (402) is fixedly arranged on the front side of the brake disc (401) and is movably connected to the brake disc (401).

Images