Brake structure suitable for touring car trailer

Abstract

The invention discloses a brake structure suitable for a touring car trailer, and belongs to the technical field of brakes, the brake structure comprises a brake assembly, the brake assembly comprises a brake drum, a fixed disc is arranged on the rear side wall of the brake drum, two mounting shoes are slidably connected to the inner side wall of the fixed disc, and a plurality of return springs are fixedly connected between the opposite side walls of the two mounting shoes; two limiting pipes are fixedly connected to the inner side wall of the mounting shoe, two connecting rods are connected to the two limiting pipes in an inserted mode, brake shoes are fixedly connected to the ends, away from the mounting shoe, of the two connecting rods, and brake pads are fixedly connected to the brake shoes. Through alternate braking of the two brake pads, friction originally concentrated in a single area is distributed to the first drum piece and the second drum piece which are independent, so that the first drum piece and the second drum piece cooperatively share the braking frequency, heat loads are dispersed, and the braking heat attenuation risk caused by local overheating is remarkably reduced.

Description

Technical Field

[0001] The invention relates to the technical field of brakes, in particular to a brake structure suitable for a recreational vehicle trailer. Background Art

[0002] A trailer RV is a towable RV, usually consisting of a trailer, equipped with a sturdy frame and replaceable room modules, suitable for long-distance travel or camping. A trailer RV provides spacious space, complete living facilities and living comfort, suitable for families, teams or users who need a larger space.

[0003] A Chinese patent discloses a drum brake with ventilation and heat dissipation function (authorization announcement number CN113915270B), which includes a drum brake component, which includes a brake base plate and a brake drum, a sealing plate movably arranged on the brake base plate and symmetrically distributed, a brake component movably arranged on the inner side of the brake base plate, a driving component movably arranged on the brake component, a buffer mechanism for driving the driving component to keep moving toward the brake drum, a linkage plate with an arc structure is arranged on one side of the sealing plate adjacent to the brake component, and a linkage rod is arranged on one side of the braking component adjacent to the sealing plate. The drum brake with ventilation and heat dissipation function can take out the high-temperature airflow and debris generated by the friction between the brake pad and the brake drum from the opening of the sealing plate through the high-speed airflow outside the drum brake, and at the same time, the driving ring drives the exhaust fan blade to keep rotating under the friction between the brake drum to increase the effect of discharging the high-temperature airflow and debris.

[0004] At present, trailer RVs generally use a collision brake system to achieve braking. The principle is that when the tractor brakes, the trailer RV moves due to inertia to squeeze the hydraulic brake and trigger the brake mechanism. However, in a long downhill scenario, the trailer RV is affected by the combined effects of gravity and inertia, which will cause the collision brake system to frequently trigger the brakes. This causes the drum brake to continuously rub and generate high temperature, causing thermal decay and increasing the risk of brake failure. Although the above-mentioned patent accelerates heat dissipation through a ventilation structure, it is also easy for pollutants such as mud, rainwater, etc. to invade the inside of the brake drum during braking, aggravating the wear and rust of brake components and reducing the protection of brake pads. At the same time, the existing drum brake has a single friction area and lacks heat distribution optimization design. For this reason, we propose a brake structure suitable for RV trailers. Summary of the invention

[0005] The object of the present invention is to provide a brake structure suitable for a recreational vehicle trailer to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A brake structure suitable for a caravan trailer comprises a brake assembly, the brake assembly comprises a brake drum, a fixed plate is arranged on the rear side wall of the brake drum, two mounting shoes are slidably connected to the inner side wall of the fixed plate, a plurality of return springs are fixedly connected between the opposite side walls of the two mounting shoes, two limiting tubes are fixedly connected to the inner side wall of the mounting shoe, two connecting rods are plugged on the two limiting tubes, the ends of the two connecting rods away from the mounting shoe are fixedly connected to the brake shoe, the brake shoe is fixedly connected to the brake pad, the ends of the two connecting rods away from the brake shoe are fixedly connected to the abutment plate, and two sets of transmission components distributed up and down are fixedly connected inside the mounting shoe; The transmission assembly includes a brake cylinder fixedly connected to a fixed plate, brake rods are provided at both ends of the brake cylinder, the ends of the two brake rods away from the brake cylinder are rotatably connected to a rotating top plate, and the rotating top plate is located inside a mounting shoe, an annular block is sleeved on the brake rod, two limit blocks are slidably connected inside the annular block, and two guide rods are fixedly connected between the two limit blocks and the rotating top plate, two straight inclined grooves and two arc-shaped inclined grooves are cut on the inner side wall of the annular block, and the two ends of the straight inclined grooves are connected to the two ends of the arc-shaped inclined grooves, a telescopic elastic block is fixedly connected to the brake rod, and the telescopic elastic block is slidably connected inside the straight inclined groove, the inner side walls of the two mounting shoes are fixedly connected to the limiting assembly, a fixing assembly is fixedly connected between the two brake rods, an alternating assembly is fixedly connected between the two connecting rods, and a sensing assembly is fixedly connected to the brake cylinder.

[0007] As a further solution of the present invention, the limiting assembly includes a fixed ring block fixedly connected to the inner wall of the mounting shoe, and the inner wall of the fixed ring block is cut with two straight sliding grooves.

[0008] As a further solution of the present invention, an annular groove connected to the straight slide groove is bored on the inner wall of the fixed ring block, and two sliding blocks are fixedly connected to the annular block, and the sliding blocks are located inside the straight slide groove.

[0009] As a further solution of the present invention, the brake drum includes a first drum piece, and the first drum piece is fixedly connected to the second drum piece via a temperature-insulating fixing belt.

[0010] As a further solution of the present invention, the fixing assembly includes a fixing plate fixedly connected to the brake rod, and a synchronization rod is fixedly connected between the upper and lower fixing plates.

[0011] As a further solution of the present invention, the alternating assembly includes a rotating block rotatably connected to the inside of the mounting shoe, and rotating columns are rotatably connected to both connecting rods.

[0012] As a further solution of the present invention, a sliding frame is sleeved on each of the two rotating columns, and a short rod is fixedly connected between the two sliding frames and the rotating block.

[0013] As a further solution of the present invention, the sensing component includes a limiting cylinder, and sliding tubes are inserted at both ends of the limiting cylinder. Both ends of the limiting cylinder are fixedly connected with an annular abutment plate, and the annular abutment plate abuts against the fixed disk.

[0014] As a further solution of the present invention, a spring block is fixedly connected to the center of the limiting cylinder, and the spring block is fixedly connected to the brake cylinder, and a connecting spring is fixedly connected between the spring block and the sliding tube.

[0015] As a further solution of the present invention, bimetallic strips are fixedly connected inside the two sliding tubes, plug-in blocks are inserted into the upper side walls of the two sliding tubes, and the bottom of the plug-in blocks abuts against the upper end of the bimetallic strips, and a limiting hole matching the plug-in blocks is drilled on the upper side wall of the limiting cylinder.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention is used, in the case where frequent braking causes the internal temperature of the brake drum to be too high, the friction originally concentrated in a single area is distributed to two independent first drum plates and second drum plates through alternating braking of the two brake pads, so that they can collaboratively share the braking frequency, thereby dispersing the heat load and significantly reducing the risk of brake thermal attenuation caused by local overheating.

[0017] 2. When the present invention is used, dynamic braking mode switching is achieved through the sensing component. Under normal working conditions, a single brake pad is used for braking, which not only improves braking stability but also avoids mechanical wear caused by alternating braking of two brake pads. The high-temperature deformation characteristics of the bimetallic sheet make it possible to achieve alternating braking of the two brake pads only under high-temperature conditions, thereby reducing the probability of thermal attenuation.

[0018] 3. When the present invention is used, it can drive the brake rod fixed with the fixed plate and the synchronization rod to move synchronously, thereby enabling the transmission assembly to be triggered more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional diagram of a brake structure suitable for a motorhome trailer; Figure 2 It is a schematic diagram of the structure inside a brake drum in a brake structure suitable for a motorhome trailer; Figure 3 A schematic diagram of the structure of the inner part of a shoe installed in a brake structure suitable for a motorhome trailer; Figure 4 It is a structural schematic diagram of a transmission component in a brake structure suitable for a motorhome trailer; Figure 5 for Figure 4 The enlarged view of point A in the middle; Figure 6 It is a structural schematic diagram of a limit assembly in a brake structure suitable for a motorhome trailer; Figure 7 It is a structural schematic diagram of a ring block in a brake structure suitable for a motorhome trailer; Figure 8 It is a structural schematic diagram of a sensing component in a brake structure applicable to a motorhome trailer; Fig. 9 The present invention is a cross-sectional diagram of a brake pad in a brake structure suitable for a recreational vehicle trailer during braking.

[0020] In the figure: 1. Brake assembly; 101. Brake drum; 1011. First drum piece; 1012. Second drum piece; 1013. Insulation fixing belt; 102. Fixed plate; 103. Mounting shoe; 104. Return spring; 105. Limiting tube; 106. Connecting rod; 107. Brake shoe; 108. Brake pad; 109. Stop plate; 2. Transmission assembly; 201. Brake cylinder; 202. Brake rod; 203. Rotating top plate; 204. Ring block; 2041. Straight inclined groove; 2042. Arc inclined groove; 205. Limit block; 206. Guide rod; 207. Telescopic elastic block; 3. Limiting assembly; 301. Fixed ring block; 302. Straight slide groove; 303. Annular groove; 304. Sliding block; 4. Fixing assembly; 401. Fixing plate; 402. Synchronous rod; 5. Alternating assembly; 501. Rotating block; 502. Rotating column; 503. Sliding frame; 504. Short rod; 6. Sensing component; 601. Limiting cylinder; 602. Sliding tube; 603. Annular abutment plate; 604. Insert block; 605. Bimetallic strip; 606. Spring block; 607. Connecting spring; 608. Limiting hole. DETAILED DESCRIPTION

[0021] The following will be combined with the 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] Example 1: Please refer to Figures 1 to 7In an embodiment of the present invention, a brake structure suitable for a motorhome trailer includes a brake assembly 1, the brake assembly 1 includes a brake drum 101 fixedly connected to an axle, the brake drum 101 includes a first drum sheet 1011 for friction braking, the first drum sheet 1011 is fixedly connected to a second drum sheet 1012 by a thermal insulation fixing belt 1013 and a plurality of bolts, the thermal insulation fixing belt 1013 can be made of ordinary carbon steel, the carbon steel not only has the hardness of steel, but also has a low thermal conductivity coefficient, it can effectively isolate the heat of the first drum sheet 1011 and the second drum sheet 1012, so that the temperature of the first drum sheet 1011 and the second drum sheet 1012 will not be greatly affected by mutual conduction, the rear side wall of the brake drum 101 is provided with a fixed plate 102 fixedly connected to a frame of a towed motorhome, the inner side wall of the fixed plate 102 is slidably connected to two mounting shoes 103 distributed on the left and right by means of a slide slot clamping connection, the two mounting shoes 103 are fixed between opposite side walls A plurality of return springs 104 are fixedly connected, and the return springs 104 prevent the two mounting shoes 103 on the left and right sides from contacting the brake pads 108 with the brake drum 101 under the pulling force of the return springs 104. The upper and lower ends of the mounting shoes 103 are provided with cavities for mounting components, and the inner side walls of the cavities are fixedly connected with two limiting tubes 105, and two connecting rods 106 are plugged on the two limiting tubes 105. The ends of the two connecting rods 106 away from the mounting shoes 103 are fixedly connected with brake shoes 107, and the brake shoes 107 are fixedly connected with brake pads 108 by bolts. When braking, the two brake pads 108 contact the first drum piece 1011 and the second drum piece 1012 respectively to achieve braking, and the ends of the two connecting rods 106 away from the brake shoes 107 are fixedly connected with abutment plates 109, and the mounting shoes 103 are fixedly connected with two groups of transmission components 2 distributed up and down for achieving alternating braking of the two brake pads 108; The transmission assembly 2 includes a brake cylinder 201 fixedly connected to the fixed plate 102 through a hard oil pipe. The brake cylinder 201 is a hydraulic pump. When the tractor brakes, the impact brake mechanism triggers the hydraulic system, so that the oil pressure is injected into the brake cylinder 201 through the oil pipe. Brake rods 202 are provided at both ends of the brake cylinder 201. Under the action of the hydraulic oil, the piston drives the two pistons inside the brake cylinder 201 to move, thereby prompting the two pistons to drive the brake rods 202 to move. The impact brake mechanism, the hydraulic system and the piston inside the brake cylinder 201 are not shown in the figure. The brake structure and principle are all existing technologies and will not be repeated here. The ends of the two brake rods 202 away from the brake cylinder 201 are rotatably connected to the rotating top plate 2 03, and the two rotating top plates 203 are respectively located inside the left and right mounting shoes 103, an annular block 204 is sleeved on the brake rod 202, and two limit blocks 205 are slidably connected inside the annular block 204, and two guide rods 206 are fixedly connected between the two limit blocks 205 and the rotating top plate 203, and the inner wall of the annular block 204 is cut with two straight inclined grooves 2041 and two arc-shaped inclined grooves 2042, and the straight inclined grooves 2041 and the arc-shaped inclined grooves 2042 are structures inclined inversely to each other, and the two are designed to connect the deeper end and the shallower end, so that the telescopic elastic block 207 can realize periodic switching when the mobile driving annular block 204 rotates to complete the continuous action, and at the same time, the arc-shaped inclined grooves 2042 have 1 When the telescopic elastic block 207 moves from the head end to the tail end of the arc-shaped inclined groove 2042, the annular block 204 can be driven to rotate 180 degrees. The annular block 204 drives the rotating top plate 203 to rotate 180 degrees together through the guide rod 206. When the annular block 204 moves to the tail end of the arc-shaped inclined groove 2042, one end of the straight inclined groove 2041 connected to the tail end of the arc-shaped inclined groove 2042 has a deeper depth, so that the annular block 204 can be switched to the inside of the straight inclined groove 2041, and the two ends of the straight inclined groove 2041 are connected to the two ends of the arc-shaped inclined groove 2042. The brake rod 202 is fixedly connected with the telescopic elastic block 207, and the telescopic elastic block 207 has an elastic telescopic structure, so that the telescopic elastic block 207 can adapt to the concave grooves of different depths. The inner walls of the two mounting shoes 103 are fixedly connected with a limiting component 3 for limiting the annular block 204. A fixing component 4 for improving the movement synchronization of the brake rod 202 is fixedly connected between the two brake rods 202. An alternating component 5 for enabling the two brake shoes 107 to stably and staggeredly move is fixedly connected between the two connecting rods 106. A sensing component 6 for preventing the two brake pads 108 from braking alternately under normal working conditions is fixedly connected to the brake cylinder 201. When the trailer caravan is traveling, the brake drum 101 is driven to rotate through the axle. When braking, the brake cylinder 201 drives the brake rods 202 at both ends to extend outward.The brake rod 202 drives the annular block 204 to move through the telescopic elastic block 207 and the arc-shaped inclined groove 2042 on the annular block 204, so that the rotating top plate 203 abuts against one of the abutment plates 109, and then drives the brake shoe 107 and the mounting shoe 103 to move together until the brake pad 108 contacts the mounting shoe 103, thereby achieving braking. When the brake rod 202 retracts, the brake rod 202 drives the rotating top plate 203 to reset, so that the mounting shoe 103 is reset under the action of the return spring 104, which will cause the mounting shoe 103 to drive the brake pad 108 through the alternating component 5 to no longer contact the brake drum 101, thereby canceling the braking.

[0023] It is worth noting that the present application adds a transmission structure for alternating braking of two brake pads 108 on the basis of the existing structure. This structure will not affect the safety and stability of braking, and the brake rod 202 can still drive the mounting shoe 103 to move to achieve braking.

[0024] The limiting component 3 includes a fixed ring block 301 fixedly connected to the inner wall of the mounting shoe 103, the inner wall of the fixed ring block 301 is chiseled with two straight grooves 302, the inner wall of the fixed ring block 301 is chiseled with an annular groove 303 connected with the straight groove 302, and two sliders 304 are fixedly connected to the annular block 204, and the sliders 304 are slidably connected inside the straight groove 302. When the brake rod 202 retracts, since the telescopic elastic block 207 is located inside the linear inclined groove 2041, and the slider 304 is limited by the straight groove 302, the brake rod 202 can rely on the telescopic elastic block 207 to drive the annular block 204 to move. When the slider 304 on the annular block 204 moves to the inside of the annular groove 303, , the annular block 204 has no space to move further, and the slider 304 moves into the annular groove 303 and is no longer restricted by the straight slide groove 302. As the brake rod 202 continues to move, the telescopic elastic block 207 can move from the head end of the arc-shaped inclined groove 2042 to the end of the arc-shaped inclined groove 2042 and switch to the straight inclined groove 2041. In this process, the annular block 204 rotates 180 degrees under the guidance of the arc-shaped inclined groove 2042, and the annular block 204 drives the rotating top plate 203 to rotate 180 degrees through the guide rod 206. When the brake rod 202 is extended next time, it can drive the rotating top plate 203 to push the other abutment plate 109, thereby achieving the purpose of alternating braking of the two brake pads 108.

[0025] It is worth noting that, considering that the braking depth is not the same and the structure needs to be compatible with the free movement of the brake rod 202, according to the above-mentioned structural process, the brake rod 202 can move freely in any stroke. If the brake rod 202 is not completely retracted, that is, the rotating top plate 203 needs to be braked again after rotating halfway, the brake rod 202 will drive the annular block 204 to rotate in the opposite direction again, and the rotating top plate 203 will also rotate in the opposite direction again. Under the effect of sufficient lubrication of the straight bevel groove 2041 and the arc bevel groove 2042, the movement of the brake rod 202 will not be affected.

[0026] The fixing assembly 4 includes a fixing plate 401 fixedly connected to the brake rod 202 by welding, and a synchronization rod 402 is fixedly connected between the upper and lower fixing plates 401. When the brake rod 202 moves, it can drive the brake rod 202 fixed with the fixing plate 401 and the synchronization rod 402 to move synchronously, thereby enabling the transmission assembly 2 to be triggered more stably.

[0027] The alternating component 5 includes a rotating block 501 rotatably connected to the inside of the mounting shoe 103, and two connecting rods 106 are rotatably connected to a rotating column 502. The two rotating columns 502 are each provided with a sliding frame 503. The sliding frame 503 is provided with a sliding opening, and the rotating column 502 is slidably connected in the sliding opening. A short rod 504 is fixedly connected between the two sliding frames 503 and the rotating block 501. When the rotating top plate 203 pushes one of the abutment plates 109, the connecting rod 106 drives the rotating block 501 to rotate through the rotating column 502, thereby causing the other connecting rod 106 to move into the mounting shoe 103 to prevent the other brake pad 108 from contacting the brake drum 101.

[0028] Example 2: Please refer to Figures 8 to 9Based on the first embodiment, the sensing component 6 includes a limiting cylinder 601, the bottom of the limiting cylinder 601 is an open structure, the left and right ends of the limiting cylinder 601 are plugged with sliding tubes 602, both ends of the limiting cylinder 601 are fixedly connected with an annular abutment plate 603, and the annular abutment plate 603 abuts against the fixed disk 401. When the brake rod 202 moves, the annular abutment plate 603 moves with the movement of the fixed disk 401. Under the action of the connecting spring 607, the annular abutment plate 603 is always in contact with the fixed disk 401. Contact, a spring block 606 is fixedly connected at the center of the limit cylinder 601, and the spring block 606 is fixedly connected to the brake cylinder 201, and a connecting spring 607 is fixedly connected between the spring block 606 and the sliding tube 602, so that the limit cylinder 601 is fixedly connected to the upper side wall of the brake cylinder 201 through the spring block 606, and the two sliding tubes 602 are fixedly connected with bimetallic strips 605 inside. Under normal conditions, the bimetallic strip 605 will push the plug block 604, so that the plug block 604 is inserted into the limit hole 608. The sliding tube 602 is fixed. At this time, the annular abutment plate 603 is in a fixed state. When the brake cylinder 201 retracts, the fixed disk 401 cannot be completely reset due to the obstruction of the annular abutment plate 603. Therefore, the slider 304 on the annular block 204 can only move on the straight slide groove 302. Therefore, under normal conditions, when the brake rod 202 moves, it will only drive the rotating top plate 203 to move, so that the rotating top plate 203 pushes the abutment plate 109 to achieve braking. The two brake pads 108 are not replaced alternately. This is to reduce the wear of the transmission component 2 and the limit component 3 and improve the stability of the brake. The upper side walls of the two sliding tubes 602 are both plugged with plug blocks 604, and the bottom of the plug blocks 604 is against the upper end of the bimetallic strip 605. The upper side wall of the limit cylinder 601 is opened with a limit hole 608 matching the plug blocks 604. When the temperature inside the brake drum 101 rises due to frequent braking, the bimetallic strip 605 is deformed by the temperature, causing the bimetallic strip 605 to pull the plug block 604 downward. At this time, the sliding tube 602 can move inside the limiting cylinder 601. At this time, the fixed disk 401 will not be reset due to the obstruction of the annular abutment plate 603, so that the slider 304 can move smoothly into the annular groove 303, and the annular block 204 can rotate, so as to achieve the purpose of alternating braking of the two brake pads 108. The two brake pads 108 brake alternately, so that the first drum piece 1011 and the second drum piece 1012 can share the frequency of this braking. When the first drum piece 1011 is in contact with friction, the second drum piece 1012 plays a role in heat dissipation, which can greatly reduce the phenomenon of thermal attenuation. At the same time, the two brake pads 108 also increase the service life of the brake drum.

[0029] The working principle of the present invention is: When the present invention is in a normal state, the insert block 604 passes through the limiting hole 608, and the two sliding tubes 602 are in a fixed state, so that the fixed disk 401 is blocked by the annular abutment plate 603, and the brake rod 202 is not completely returned. Therefore, the rotating top plate 203 is restricted by the limiting block 205 and the guide rod 206, and the annular block 204 is not completely returned, that is, the slider 304 on the annular block 204 does not enter the annular groove 303. At this time, the annular block 204 does not rotate but can only move. When braking is needed, the brake cylinder 201 drives the brake rod 202 to extend outward, and the brake rod 202 drives the annular block 204 to move through the telescopic elastic block 207 and the straight inclined groove 2041. At the same time, the brake rod 202 also drives the rotating top plate 203 to move together, so that the rotating top plate 203 can push one of the abutments The plate 109 makes the abutment plate 109 extend outward, and the rotating block 501 rotates, so that the other connecting rod 106 moves into the mounting shoe 103 to prevent the other brake pad 108 from contacting the brake drum 101. As the brake rod 202 continues to move, after the connecting rod 106 moves to a certain distance, the sliding frame 503 will limit the connecting rod 106 from continuing to move, and then the mounting shoe 103 will be driven to move through the rotating block 501. At the same time, the brake rod 202 will also push the mounting shoe 103 to move through the fixed plate 401 until the brake pad 108 contacts and rubs with the brake drum 101 to achieve braking. In this way, the sliding frequency of the telescopic elastic block 207 in the straight inclined groove 2041 and the arc inclined groove 2042 can be reduced, the braking stability can be improved, and the service life of the transmission assembly 2 components can also be extended. When the brake drum 101 is frequently braked and the interior is in a high temperature state, the bimetallic strip 605 is deformed by the temperature, so that the bimetallic strip 605 drives the plug block 604 to move downward. At this time, the sliding tube 602 can move inside the limiting tube 601. At this time, the fixed disk 401 will not be reset due to the obstruction of the annular abutment plate 603. During the reset process, when the brake rod 202 retracts, the slider 304 moves into the annular groove 303 and is no longer restricted by the straight slide groove 302. As the brake rod 202 continues to move, the telescopic elastic block 207 can move from the head end of the arc-shaped inclined groove 2042 to the end of the arc-shaped inclined groove 2042 and switch to the straight inclined groove 2041. In this process, the annular block 204 is in the arc-shaped inclined groove 2042. The annular block 204 drives the rotating top plate 203 to rotate 180 degrees through the guide rod 206. When the brake rod 202 is extended for the next time, the rotating top plate 203 can be driven to push the other abutment plate 109, so as to achieve the purpose of alternating braking of the two brake pads 108. The two brake pads 108 are alternately braked by friction with the first drum plate 1011 and the second drum plate 1012, so that the frequency of the brake can be shared, which can greatly reduce the phenomenon of thermal attenuation. At the same time, the two brake pads 108 also increase the service life of the brake drum. The rotation of the rotating top plate 203 is only carried out when the brake rod 202 is retracted. At the same time, the brake rod 202 is still in a state of automatic movement, and the whole process will not be stuck. When the temperature inside the brake drum 101 drops, the bimetallic strip 605 will restore its deformation, so that the bimetallic strip 605 can exert an upward force on the plug block 604. When the brake rod 202 is moving, the fixed plate 401 will also drive the annular support plate 603 to move, and the annular support plate 603 will drive the sliding tube 602 to move. When the plug block 604 corresponds to the limiting hole 608, the plug block 604 will be inserted into the limiting hole 608 again, so that the sliding tube 602 is in a fixed state again.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A brake structure suitable for a motorhome trailer, comprising a brake assembly (1), characterized in that: The brake assembly (1) comprises a brake drum (101), a fixed plate (102) is arranged on the rear side wall of the brake drum (101), two mounting shoes (103) are slidably connected to the inner side wall of the fixed plate (102), a plurality of return springs (104) are fixedly connected between the opposite side walls of the two mounting shoes (103), two limiting tubes (105) are fixedly connected to the inner side wall of the mounting shoe (103), two connecting rods (106) are plugged on the two limiting tubes (105), the ends of the two connecting rods (106) away from the mounting shoe (103) are fixedly connected to a brake shoe (107), the brake shoe (107) is fixedly connected to a brake pad (108), the ends of the two connecting rods (106) away from the brake shoe (107) are fixedly connected to a stop plate (109), and two groups of transmission assemblies (2) distributed up and down are fixedly connected inside the mounting shoe (103); The transmission assembly (2) comprises a brake cylinder (201) fixedly connected to a fixed plate (102), a brake rod (202) being provided at both left and right ends of the brake cylinder (201), the ends of the two brake rods (202) away from the brake cylinder (201) being rotatably connected to a rotating top plate (203), and the rotating top plate (203) being located inside the mounting shoe (103), an annular block (204) being sleeved on the brake rod (202), two limit blocks (205) being slidably connected inside the annular block (204), and two guide rods (206) being fixedly connected between the two limit blocks (205) and the rotating top plate (203), and the annular block (204) The inner wall is provided with two straight inclined grooves (2041) and two arc-shaped inclined grooves (2042), and the two ends of the straight inclined groove (2041) are connected to the two ends of the arc-shaped inclined groove (2042); a telescopic elastic block (207) is fixedly connected to the brake rod (202), and the telescopic elastic block (207) is slidably connected inside the straight inclined groove (2041); the inner walls of the two mounting shoes (103) are both fixedly connected to a limiting component (3); a fixing component (4) is fixedly connected between the two brake rods (202); an alternating component (5) is fixedly connected between the two connecting rods (106); and a sensing component (6) is fixedly connected to the brake cylinder (201).

2. A brake structure suitable for a recreational vehicle trailer according to claim 1, characterized in that: The limiting assembly (3) comprises a fixed ring block (301) fixedly connected to the inner side wall of the mounting shoe (103), and the inner side wall of the fixed ring block (301) is provided with two straight sliding grooves (302).

3. A brake structure suitable for a recreational vehicle trailer according to claim 2, characterized in that: The inner side wall of the fixed ring block (301) is provided with an annular groove (303) connected to the straight slide groove (302). Two sliding blocks (304) are fixedly connected to the annular block (204), and the sliding blocks (304) are located inside the straight slide groove (302).

4. A brake structure suitable for a recreational vehicle trailer according to claim 1, characterized in that: The brake drum (101) comprises a first drum sheet (1011), wherein the first drum sheet (1011) is fixedly connected to a second drum sheet (1012) via a temperature-insulating fixing belt (1013).

5. The brake structure suitable for a recreational vehicle trailer according to claim 1, characterized in that: The fixing assembly (4) comprises a fixing plate (401) fixedly connected to the brake rod (202), and a synchronization rod (402) is fixedly connected between the upper and lower fixing plates (401).

6. A brake structure suitable for a recreational vehicle trailer according to claim 1, characterized in that: The alternating assembly (5) comprises a rotating block (501) rotatably connected inside the mounting shoe (103), and rotating columns (502) are rotatably connected to the two connecting rods (106).

7. A brake structure suitable for a recreational vehicle trailer according to claim 6, characterized in that: The two rotating columns (502) are both sleeved with a sliding frame (503), and a short rod (504) is fixedly connected between the two sliding frames (503) and the rotating block (501).

8. The brake structure suitable for a recreational vehicle trailer according to claim 5, characterized in that: The sensing component (6) comprises a limiting cylinder (601), the left and right ends of which are both plugged with sliding tubes (602), the two ends of which are both fixedly connected with an annular abutment plate (603), and the annular abutment plate (603) abuts against the fixed disk (401).

9. A brake structure suitable for a recreational vehicle trailer according to claim 8, characterized in that: A spring block (606) is fixedly connected to the center of the limiting cylinder (601), and the spring block (606) is fixedly connected to the brake cylinder (201). A connecting spring (607) is fixedly connected between the spring block (606) and the sliding tube (602).

10. A brake structure suitable for a recreational vehicle trailer according to claim 9, characterized in that: The two sliding tubes (602) are both fixedly connected with a bimetallic strip (605) inside, the upper side walls of the two sliding tubes (602) are both plugged with an insert block (604), and the bottom of the insert block (604) is against the upper end of the bimetallic strip (605), and the upper side wall of the limiting cylinder (601) is drilled with a limiting hole (608) matching the insert block (604).

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