Multi-stage buffer type braking device of traction type motor home

Abstract

The invention relates to the technical field of motor home braking, in particular to a multi-stage buffer type braking device of a traction type motor home. Comprising a hub which is fixedly connected with a rotating shaft; the supporting frame is rotationally connected to the hub; the brake disc is rotationally connected to the supporting frame, the brake disc is fixedly connected with a brake pad, and the brake pad is in friction fit with the hub; the brake cylinder is fixedly connected to the supporting frame; the electromagnetic brake is connected to the supporting frame in a sliding mode; the first hydraulic telescopic rods are fixedly connected to the adjacent supporting frames. The telescopic end of the first hydraulic telescopic rod drives the electromagnetic brake to move, the moving range of the magnetic block is changed, then the extension amount of the piston on the brake cylinder is adjusted, the rotation amount of the adjacent brake pad driven by the brake disc is changed, it is ensured that the brake pad can still recover the brake force after being abraded, and the brake efficiency is improved. Synchronous braking of the motor home and the tractor is achieved, and the braking safety of the motor home is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of motorhome braking, and in particular to a multi-stage buffer braking device for a towed motorhome. Background Art

[0002] The braking device of a towed RV (also called a trailer RV or trailer RV) is an important component to ensure its safe operation. A towed RV consists of a tractor and a RV. The driving modes of the tractor include plug-in hybrid drive, pure electric drive and fuel cell drive. The tractor is connected to the RV through a traction device to drive the RV. A brake synchronizer is generally provided in the cockpit of the tractor. The brake synchronizer enables the RV to brake synchronously when the tractor brakes. The existing brake synchronizer drives the brake pads of the RV to move through the electromagnetic brake to brake the RV, and the speed at which the electromagnetic brake drives the brake pads to move can be adjusted through the brake synchronizer to achieve multi-level buffering of the wheel hub. However, with the continuous use of the brake pads on the RV, the brake pads will gradually wear out. After the brake pads are worn out, the electromagnetic brake will not be able to achieve synchronous braking of the RV and the tractor through the originally set magnetic force, thereby affecting the braking performance of the RV and further affecting the safety of the people in the RV. Summary of the invention

[0003] In order to overcome the shortcomings mentioned in the above background technology, the present invention provides a multi-stage buffer brake device for a towable RV.

[0004] The technical solution of the present invention is: a multi-stage buffer brake device for a towed RV, comprising: There are two wheel hubs, and the two wheel hubs are fixedly connected to a rotating shaft; The supporting frames have two and are respectively rotatably connected to the adjacent wheel hubs, and the supporting frames are rotatably connected to the rotating shaft; There are four brake discs, and each two are rotatably connected to the adjacent support frames in a group, and a brake pad is fixedly connected to the position of the brake disc close to the inner side wall of the wheel hub, and the brake pad is frictionally matched with the wheel hub; The brake cylinder has two parts and is respectively fixed to the adjacent support frames, the brake cylinder is located between the symmetrically distributed brake discs, the brake cylinder is connected with a sleeve, and the brake cylinder is provided with two pistons respectively pressed and matched with the adjacent brake discs; The electromagnetic brake has two parts and is respectively slidably connected to the adjacent support frames. The electromagnetic brake is fixedly connected to one end of the adjacent sleeve. A magnetic block that is magnetically matched with the electromagnetic brake is sealed and slidably connected inside the sleeve. The first hydraulic telescopic rods, the number of which is the same as the number of the brake discs, are fixedly connected to the adjacent support frame, and the telescopic end of the first hydraulic telescopic rod is fixedly connected to the electromagnetic brake.

[0005] As a preference, the magnetic part of the electromagnetic brake is covered by the adjacent sleeve, and the sleeve is a magnetic shielding material to isolate the magnetic field generated by the adjacent magnetic block and the adjacent electromagnetic brake.

[0006] As a preferred embodiment, it also includes: The number of second hydraulic telescopic rods is the same as that of the first hydraulic telescopic rods, and the second hydraulic telescopic rods are fixed to the adjacent brake discs, and the second hydraulic telescopic rods are connected to the adjacent first hydraulic telescopic rods through a conduit; The squeezing balls, the number of which is the same as the number of the second hydraulic telescopic rods, are fixedly connected to the telescopic ends of the adjacent second hydraulic telescopic rods, and the squeezing balls are squeeze-fitted with the wheel hub.

[0007] As a preferred embodiment, the projection of the farthest point on the squeezing ball from the adjacent second hydraulic telescopic rod on the support frame coincides with the projection of the adjacent brake pad edge on the support frame.

[0008] As a preference, the force required for the deformation of the extruded ball is greater than the force required for its displacement.

[0009] As a preferred embodiment, it also includes: There are a plurality of first wedge blocks, which are fixedly connected to the telescopic end of the adjacent second hydraulic telescopic rod. The fixed part of the second hydraulic telescopic rod is slidably connected with the second wedge block. A first elastic member is fixedly connected between the second wedge block and the adjacent second hydraulic telescopic rod. The first wedge block is limitedly matched with the adjacent second wedge block.

[0010] As a preferred embodiment, it also includes: There are two pipelines, which are connected to the adjacent brake cylinders, and the first piston is sealingly and slidably connected in the pipelines; The weight block is fixedly connected to the first piston, and a second elastic member distributed up and down is fixedly connected between the weight block and the support frame.

[0011] Preferably, the weight block on one side is located outside the wheel hub, the weight block on the other side is located inside the wheel hub, and the two pipes are distributed in an array.

[0012] As a preferred embodiment, it also includes: The support blocks have two parts and are respectively fixed in adjacent support frames. A third elastic member is fixed to one side of the support block facing the weight block. The elastic member of the support block is squeezed and matched with the weight block. The third elastic member is used to provide resistance for the unidirectional movement of the weight block.

[0013] As a preferred embodiment, it also includes: The second piston is sealingly and slidably connected in the pipeline, and a fourth elastic member is fixedly connected between the second piston and the pipeline.

[0014] Compared with the prior art, the advantages and positive effects of the present invention are as follows: 1. The present invention drives the electromagnetic brake to move through the telescopic end of the first hydraulic telescopic rod, changes the moving range of the magnetic block, and then adjusts the extension amount of the piston on the brake cylinder, so that the rotation amount of the adjacent brake pad driven by the brake disc changes, ensuring that the brake pad can still restore the braking force after wear, so that the RV and the tractor can achieve synchronous braking to ensure the safety of the RV braking, and the operator can adjust the speed of the electromagnetic brake to drive the brake pad to move through the brake synchronizer to achieve multi-level buffering of the wheel hub; 2. Through the unidirectional contraction of the telescopic end of the second hydraulic telescopic rod, the adjacent first hydraulic telescopic rod is transmitted, so that the telescopic end of the first hydraulic telescopic rod is adaptively extended, and the position of the electromagnetic brake is automatically adjusted, so that the brake pads can automatically restore the braking force after wear; 3. By making the space for brake fluid to enter the outer pipe larger than the space for brake fluid to enter the inner pipe, the amount of brake fluid in the inner and outer brake cylinders is adjusted differently, so that the braking strength of the outer wheel hub is smaller than that of the inner wheel hub, the movable distance of the outer wheel hub is larger than that of the inner wheel hub, and the outer wheel hub rotates around the inner wheel hub and automatically straightens to reduce the occurrence of RV tail-swinging and ensure the safety of braking of towed RVs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a three-dimensional structural cross-sectional view of the wheel hub, the rotating shaft and the supporting frame of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of the brake disc and brake pad of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the brake cylinder of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the extruded ball of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the pipeline of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the weight block of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the support block of the present invention.

[0016] Among them, the drawings in the specification include the following figure marks: 1-wheel hub, 2-rotating shaft, 3-support frame, 4-brake disc, 5-brake pad, 6-brake cylinder, 601-casing, 7-electromagnetic brake, 8-magnetic block, 9-first hydraulic telescopic rod, 10-second hydraulic telescopic rod, 11-squeezing ball, 12-first wedge block, 13-second wedge block, 14-pipeline, 15-first piston, 16-weight block, 17-support block, 18-second piston. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention.

[0018] In order to ensure that the brake pads can still guarantee the braking force after being worn, thereby improving the safety of the RV, the present invention proposes a multi-stage buffer brake device for a towing RV. Figure 1-Figure 4As shown, it includes: a wheel hub 1, which has two, and a brake synchronizer is arranged on the outside of the wheel hub 1, wherein the brake synchronizer is not shown in the figure. When using the device, the brake synchronizer is installed on the tractor of the towing RV. The driving mode of the tractor can be plug-in hybrid drive, pure electric drive or fuel cell drive. The brake synchronizer is connected to the power supply of the driving power on the tractor, and is used to adjust the braking force of the RV according to the output degree of the driving power on the tractor. The two wheel hubs 1 are commonly fixed with a rotating shaft 2; a support frame 3, which has two and is respectively rotatably connected to adjacent wheel hubs 1, the support frame 3 is rotatably connected to the rotating shaft 2, and the support frame 3 is installed on the RV by bolts; a brake disc 4, having four, and every two are rotatably connected to the adjacent support frame 3 in a group, the brake disc 4 is made of cast iron or high-strength steel to ensure the strength and durability of the brake disc 4, the brake disc 4 is fixed with a brake pad 5 near the inner wall of the wheel hub 1, the brake pad 5 and the wheel hub 1 are frictionally matched, after the back sides of the two adjacent brake pads 5 are both close to the wheel hub 1, the wheel hub 1 is decelerated until it stops rotating by relying on the friction between the brake pad 5 and the wheel hub 1; the brake cylinder 6, having two and respectively fixed to the adjacent support frame 3, the brake cylinder 6 is located between the symmetrically distributed brake discs 4, the brake cylinder 6 is connected with a sleeve 601, and the sleeve 601 consists of two upper and lower parts that are slidably connected to each other The brake cylinder 6 and the sleeve 601 are composed of a hollow sleeve, brake fluid is set in the brake cylinder 6 and the sleeve 601, the brake cylinder 6 is provided with two pistons respectively squeezed with the adjacent brake disc 4; the electromagnetic brake 7 has two and is slidably connected to the adjacent support frame 3, the electromagnetic brake 7 is fixedly connected to the lower end of the adjacent sleeve 601, and the electromagnetic brake 7 is electrically connected to the brake synchronizer. When the trailer brakes, the brake synchronizer is used to control the start of the electromagnetic brake 7, thereby braking the RV. The sleeve 601 is sealed and slidably connected with a magnetic block 8 that is magnetically matched with the electromagnetic brake 7. The opposite sides of the electromagnetic brake 7 and the magnetic block 8 are of the same pole, and the magnetic part of the electromagnetic brake 7 is attracted by the adjacent sleeve 60 1 is a housing, and the sleeve 601 is a magnetic shielding material to isolate the magnetic field generated by the adjacent magnetic block 8 and the adjacent electromagnetic brake 7, so as to prevent the magnetic field generated by the magnetic block 8 and the electromagnetic brake 7 from affecting the metal materials such as the brake disc 4, thereby preventing the metal in the braking system from being displaced, causing the braking performance of the RV to be affected, and further affecting the safety of the RV; the first hydraulic telescopic rod 9, the number of which is the same as the number of the brake disc 4, is fixedly connected to the adjacent support frame 3. In this embodiment, the first hydraulic telescopic rod 9 is driven by an external hydraulic rod, wherein the external hydraulic rod is not shown in the figure, and the telescopic end of the first hydraulic telescopic rod 9 is fixedly connected to the electromagnetic brake 7, and is used to drive the electromagnetic brake 7 to move.

[0019] The working process is as follows: when the operator needs to use the present device to brake the trailer RV (hereinafter referred to as the RV), the operator controls the electromagnetic brake 7 to start through the brake synchronizer. The electromagnetic brake 7 generates a magnetic field and pushes the magnet 8 to move upward through its magnetic force. The magnet 8 moves upward and squeezes the brake fluid in the sleeve 601. The brake fluid in the sleeve 601 enters the brake cylinder 6. The pistons on both sides of the brake cylinder 6 gradually extend and squeeze the adjacent brake disc 4, so that the brake disc 4 drives the adjacent brake pad 5 to rotate. The brake pad 5 squeezes the inner wall of the wheel hub 1, and relies on the friction between the brake pad 5 and the wheel hub 1 to slow down the wheel hub 1 until it stops rotating. The operator can adjust the speed at which the electromagnetic brake drives the brake pad to move through the brake synchronizer, so that the magnetic force of the electromagnetic brake 7 increases step by step during use, thereby realizing multi-level buffering of the wheel hub 1 to avoid the phenomenon of tail-swinging when the RV stops suddenly.

[0020] When the brake pad 5 is worn, the first hydraulic telescopic rod 9 can be driven by an external hydraulic rod, so that the telescopic end of the first hydraulic telescopic rod 9 extends out and drives the electromagnetic brake 7 to move, so as to adjust the position of the electromagnetic brake 7, change the moving range of the magnetic block 8, and then adjust the extension amount of the piston on the brake cylinder 6, so that the brake disc 4 drives the rotation amount of the adjacent brake pad 5 to change, ensuring that the brake pad 5 can still fit tightly against the wheel hub 1 after being worn, thereby extending the service life of the brake pad 5 and improving the safety of the RV.

[0021] When the operator needs to stop using the device, the operator turns off the power supply of the RV and performs regular maintenance on the device.

[0022] In the following embodiments, there is no need to use an external hydraulic rod to drive the first hydraulic telescopic rod 9 , and the adjacent first hydraulic telescopic rod 9 can be driven by the second hydraulic telescopic rod 10 .

[0023] In order to automatically restore the braking force after the brake pads are worn, Figure 4 and Figure 5As shown, the present invention also includes: second hydraulic telescopic rods 10, the number of which is the same as the number of first hydraulic telescopic rods 9, fixedly connected to the adjacent brake disc 4, the second hydraulic telescopic rod 10 is connected to the adjacent first hydraulic telescopic rod 9 through a conduit, the first hydraulic telescopic rod 9 and the second hydraulic telescopic rod 10 are both provided with hydraulic oil, in this embodiment, the adjacent first hydraulic telescopic rod 9 is transmitted through the second hydraulic telescopic rod 10; squeezing balls 11, the number of which is the same as the number of the second hydraulic telescopic rod 10, fixedly connected to the telescopic end of the second hydraulic telescopic rod 10, the squeezing balls 11 are squeezed and matched with the wheel hub 1, and the squeezing balls 11 are spaced from the adjacent The projection of the farthest point of the second hydraulic telescopic rod 10 on the support frame 3 coincides with the projection of the edge of the adjacent brake pad 5 on the support frame 3. When the brake pad 5 is worn, the wheel hub 1 contacts and squeezes the squeezing ball 11, so that the squeezing ball 11 drives the telescopic end of the second hydraulic telescopic rod 10 to move, so that the wear amount of the brake pad 5 is proportional to the extension amount of the telescopic end of the second hydraulic telescopic rod 10. The force required for the deformation of the squeezing ball 11 is greater than the force required for its displacement, so as to prevent the squeezing ball 11 from being deformed due to the squeezing of the wheel hub 1, resulting in errors in the extension amount of the telescopic end of the second hydraulic telescopic rod 10 during automatic adjustment.

[0024] Comparison Figure 5 As shown, it also includes: a first wedge block 12, which has a plurality of pieces and is fixedly connected to the telescopic end of the adjacent second hydraulic telescopic rod 10, and the fixed part of the second hydraulic telescopic rod 10 is slidably connected with the second wedge block 13, the first wedge block 12 and the second wedge block 13 are both provided with inclined surfaces, and a first elastic member is fixedly connected between the second wedge block 13 and the adjacent second hydraulic telescopic rod 10, wherein the first elastic member is a compression spring and initially has no force stored, the first wedge block 12 and the adjacent second wedge block 13 are limitedly matched, the inclined surface of the first wedge block 12 faces the fixed part of the adjacent second hydraulic telescopic rod 10, and the inclined surface of the second wedge block 13 faces the adjacent first wedge block 12, when the first wedge block 12 passes the adjacent second wedge block 13, the first wedge block 12 squeezes the adjacent second wedge block 13, and the second wedge block 13 is pressed to drive the first elastic member to compress.

[0025] The working process is as follows: when the brake pad 5 is worn, when the brake disc 4 drives the adjacent brake pad 5 to rotate, the brake disc 4 simultaneously drives the squeezing ball 11 to squeeze the wheel hub 1, so that the squeezing ball 11 is in direct contact with the wheel hub 1, and the wheel hub 1 squeezes the adjacent squeezing ball 11, and the squeezing ball 11 drives the telescopic end of the second hydraulic telescopic rod 10 to contract (and when the telescopic end of the second hydraulic telescopic rod 10 contracts, the telescopic end of the second hydraulic telescopic rod 10 drives all the first wedge blocks 12 thereon to move, and after the first wedge block 12 passes through the adjacent second wedge block 13, the first wedge block 12 is stuck by the adjacent second wedge block 13 to prevent the first wedge block 12 from resetting), the second hydraulic telescopic rod 10 injects hydraulic oil into the adjacent first hydraulic telescopic rod 9 through the conduit, and the telescopic end of the first hydraulic telescopic rod 9 extends, and the first hydraulic telescopic rod 9 automatically adjusts the position of the electromagnetic brake 7 through the steps of the above embodiment, so that the brake pad 5 automatically restores the braking force after wear.

[0026] In order to make the RV automatically straighten when there is a risk of tail-swinging, so as to reduce the occurrence of tail-swinging, Figure 3 and Figure 5-Figure 8 As shown, the present invention also includes: a pipe 14, which has two parts and is connected to adjacent brake cylinders 6. A first piston 15 is sealed and slidably connected in the pipe 14. The first piston 15 is parallel to the rotating shaft 2. When the motorhome shakes along the rotating shaft 2, the first piston 15 moves; a weight block 16 is fixedly connected to the first piston 15. A second elastic member distributed up and down is fixedly connected between the weight block 16 and the support frame 3, wherein the second elastic member is a tension spring to increase the resistance of the weight block 16 when it moves forward and backward, thereby preventing the weight block 16 from being accidentally touched when a small amplitude shake occurs during normal driving of the motorhome. The front weight block 16 is located outside the wheel hub 1, and the rear weight block 16 is located inside the wheel hub 1, and the two pipes 14 are distributed in an array.

[0027] Comparison Figure 5-Figure 8 As shown, it also includes: a support block 17, which has two and is respectively fixed in the adjacent support frame 3, and the front support block 17 is fixed with a third elastic member on the side facing the weight block 16, wherein the third elastic member is a compression spring, and the third elastic member of the support block 17 is squeezed and matched with the weight block 16, and the third elastic member is used to provide resistance for the unidirectional movement of the weight block 16. In actual use, the two wheel hubs 1 on different sides are symmetrically placed, and the structures in this embodiment on different sides are array distributed, wherein Figure 7 The front wheel hub 1 is shown in FIG. Figure 8 What is shown is the rear wheel hub 1 , and the third elastic member is not provided on the support block 17 in the rear wheel hub 1 .

[0028] Comparison Figure 5-Figure 7As shown, it also includes: a second piston 18, which is sealed and slidably connected in the pipe 14, and a fourth elastic member is fixedly connected between the second piston 18 and the pipe 14, wherein the fourth elastic member is a spring, and the elastic force of the fourth elastic member is much smaller than the resistance generated by the brake disc 4 on the adjacent piston on the adjacent brake cylinder 6, so that even if the second piston 18 drives the fourth elastic member on it to expand and contract, the piston on the brake cylinder 6 cannot extend. When the first piston 15 moves, the second piston 18 moves, and the fourth elastic member of the second piston 18 is deformed, so that the brake fluid is still located in the pipe 14, avoiding brake triggering. When the operator actively brakes and the first piston 15 moves forward, it means that the RV shakes significantly at this time, and the brake fluid in the pipe 14 flows into the brake cylinder 6, causing the piston of the brake cylinder 6 to extend.

[0029] The working process is as follows: when the RV turns or a large vehicle passes by one side of the RV, the towed RV will have a tail-swinging phenomenon. Taking the RV turning forward as an example, the weights 16 on the outside and inside of the turning point of the RV will move backward, but the centrifugal force on the outside weight 16 is greater, and the distance it moves backward will also be greater. The outside first piston 15 extracts more brake fluid in the pipeline 14, so that the space in the outer pipeline 14 that can enter the brake fluid is larger than the space in the inner pipeline 14 that can enter the brake fluid. More brake fluid in the outer brake cylinder 6 flows into the outer pipeline 14, so that the amount of brake fluid in the outer brake cylinder 6 is less than the amount of brake fluid entering the inner brake cylinder 6, and the braking strength of the outer wheel hub 1 is less than the braking strength of the inner wheel hub 1, so that the movable distance of the outer wheel hub 1 is greater than that of the inner wheel hub 1, and the outer wheel hub rotates around the inner wheel hub 1 and automatically straightens to reduce the occurrence of the RV tail-swinging phenomenon and ensure the safety of the towed RV braking.

[0030] Taking the RV turning backward as an example, the front weight block 16 moves forward to squeeze the third elastic part of the support block 17, and the rear weight block 16 slides normally (because the rear support block 17 is not provided with the third elastic part), so that the front weight block 16 is blocked and moves a smaller distance. At this time, the third elastic part of the front support block 17 is compressed to offset the centrifugal force on the front weight block 16, and the rear weight block 16 moves a longer distance. The front first piston 15 squeezes less brake fluid in the pipeline 14, so that the first piston 15 located on the inner side (that is, the rear side at this time) squeezes more brake fluid into the inner brake cylinder 6. The amount of brake fluid entering the outer brake cylinder 6 is still less than the amount of brake fluid entering the inner brake cylinder 6, and the braking strength of the outer wheel hub 1 is still less than that of the inner wheel hub 1, so that the movable distance of the outer wheel hub 1 is still greater than that of the inner wheel hub 1, and the outer wheel hub rotates around the inner wheel hub 1 and automatically aligns to reduce the occurrence of the RV tail-swinging phenomenon and ensure the safety of the braking of the towed RV.

[0031] When the operator needs to stop using the device, the operator turns off the power supply of the RV and performs regular maintenance on the device.

[0032] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-stage buffer brake device for a towed RV, characterized in that: include: The wheel hubs (1) are provided with two, and the two wheel hubs (1) are commonly fixedly connected to a rotating shaft (2); The support frames (3) have two and are respectively rotatably connected to adjacent wheel hubs (1), and the support frames (3) are rotatably connected to the rotating shaft (2); The brake discs (4) are four in number, and each group of two is rotatably connected to the adjacent support frames (3); a brake pad (5) is fixedly connected to a position of the brake disc (4) close to the inner side wall of the wheel hub (1); and the brake pad (5) is frictionally engaged with the wheel hub (1); The brake cylinder (6) has two parts and is respectively fixed to the adjacent support frames (3); the brake cylinder (6) is located between the symmetrically distributed brake discs (4); a sleeve (601) is connected to the brake cylinder (6); and the brake cylinder (6) is provided with two pistons respectively pressed and matched with the adjacent brake discs (4); The electromagnetic brake (7) has two parts which are respectively slidably connected to the adjacent support frames (3); the electromagnetic brake (7) is fixedly connected to one end of the adjacent sleeve (601); a magnetic block (8) which is magnetically matched with the electromagnetic brake (7) is sealed and slidably connected inside the sleeve (601); The first hydraulic telescopic rods (9) are the same in number as the brake discs (4) and are fixedly connected to the adjacent support frame (3); the telescopic ends of the first hydraulic telescopic rods (9) are fixedly connected to the electromagnetic brake (7).

2. A multi-stage buffer brake device for a towed RV according to claim 1, characterized in that: The magnetic part of the electromagnetic brake (7) is covered by the adjacent sleeve (601), and the sleeve (601) is a magnetic shielding material so as to isolate the magnetic field generated by the adjacent magnetic block (8) and the adjacent electromagnetic brake (7).

3. A multi-stage buffer brake device for a towed RV according to claim 1, characterized in that: include: a second hydraulic telescopic rod (10), the number of which is the same as that of the first hydraulic telescopic rod (9), fixedly connected to the adjacent brake disc (4), the second hydraulic telescopic rod (10) being in communication with the adjacent first hydraulic telescopic rod (9) via a conduit; The squeezing balls (11) are the same in number as the second hydraulic telescopic rods (10) and are fixedly connected to the telescopic ends of the adjacent second hydraulic telescopic rods (10). The squeezing balls (11) are squeeze-fitted with the wheel hub (1).

4. A multi-stage buffer brake device for a towed RV according to claim 3, characterized in that: The projection of the point on the squeezing ball (11) that is farthest from the adjacent second hydraulic telescopic rod (10) on the support frame (3) coincides with the projection of the edge of the adjacent brake pad (5) on the support frame (3).

5. A multi-stage buffer brake device for a towed RV according to claim 4, characterized in that: The force required for the squeezing ball (11) to deform is greater than the force required for its displacement.

6. A multi-stage buffer brake device for a towed RV according to claim 4, characterized in that: include: The first wedge blocks (12) are provided in plurality and are fixedly connected to the telescopic end of the adjacent second hydraulic telescopic rod (10); the fixed portion of the second hydraulic telescopic rod (10) is slidably connected to the second wedge block (13); a first elastic member is fixedly connected between the second wedge block (13) and the adjacent second hydraulic telescopic rod (10); the first wedge block (12) and the adjacent second wedge block (13) are limitedly matched.

7. The multi-stage buffer brake device for a towed RV according to claim 1 is characterized in that: include: There are two pipes (14) connected to adjacent brake cylinders (6), and a first piston (15) is sealingly and slidably connected inside the pipes (14); The weight block (16) is fixedly connected to the first piston (15), and a second elastic member distributed vertically is fixedly connected between the weight block (16) and the support frame (3).

8. A multi-stage buffer brake device for a towed RV according to claim 7, characterized in that: The weight block (16) on one side is located outside the wheel hub (1), the weight block (16) on the other side is located inside the wheel hub (1), and the two pipes (14) are distributed in an array.

9. A multi-stage buffer brake device for a towed RV according to claim 8, characterized in that: include: The support blocks (17) have two portions and are respectively fixed in adjacent support frames (3); a third elastic member is fixed to a side of the support block (17) facing the weight block (16); the elastic member of the support block (17) is pressed and matched with the weight block (16); and the third elastic member is used to provide resistance to the unidirectional movement of the weight block (16).

10. A multi-stage buffer brake device for a towed RV according to claim 7, characterized in that: include: The second piston (18) is sealingly and slidably connected in the pipe (14), and a fourth elastic member is fixedly connected between the second piston (18) and the pipe (14).

Images