Unpowered vehicle comprising dragging damping system

Abstract

The invention belongs to the technical field of vehicle operation control, and discloses an unpowered vehicle comprising a dragging damping system, which comprises the dragging damping system, a chassis, wheels and a shaft, the shaft penetrates through the chassis and is in clearance fit with the chassis; the two ends of the shaft are fixedly connected with the wheels respectively; the dragging damping system comprises an inner wheel disc, an inner damping ring, an outer damping ring and a damping fixing plate; the damping fixing plate is fixed to the chassis, the inner damping ring is located in the outer damping ring, and the inner wheel disc is arranged in the inner damping ring. The inner ring of the inner damping ring and the circumferential face of the inner wheel disc are each provided with a circle of ratchets. A waist-shaped through hole is formed in the inner wheel disc; a through hole A is formed in the damping fixing plate, the shaft sequentially penetrates through the through hole A and the kidney-shaped through hole, and the shaft is in clearance fit with the through hole A. The safety risks of unhooking, squeezing, drifting, overturning and the like caused by out-of-control posture of the motor-free car due to acceleration or deceleration of the tractor are avoided, and the problems of impact or collision between the motor-free car and the tractor due to inertia are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle operation control and relates to a non-powered vehicle comprising a drag damping system. Background Art

[0002] During vehicle driving, fluctuations in vehicle speed, complex and changeable road conditions, and driving operations such as turning will cause difficult-to-control vehicle inertia, which poses a severe challenge to vehicle safety, especially in the field of unpowered vehicle towing. Although current vehicle control technology has accumulated certain achievements in trailer safety technology, the negative impact of vehicle inertia on safe driving has not been fundamentally resolved, and further optimization and improvement are urgently needed.

[0003] Patent CN218536236U discloses a trailer buffer brake device, which uses a spring damping buffer brake device to achieve a smooth braking buffer effect; Patent CN109823323A discloses a braking method suitable for characteristic vehicles, which effectively avoids the impact or collision between the trailer and the tractor during emergency braking or deceleration through the reasonable design of the towing rod assembly and the service brake assembly, thereby eliminating potential safety hazards. However, these solutions still have certain limitations when dealing with specific scenarios, as follows:

[0004] (1) In the case of multiple non-powered vehicles towing, since these vehicles are often designed to be relatively flexible for easy disassembly and assembly, they usually do not have braking devices. This makes the above solution effective in the case of a single-section trailer towing, but difficult to apply in similar situations such as multiple non-powered trailers, because the brake system cannot be quickly disassembled and adapted, and thus cannot provide an ideal braking effect.

[0005] (2) Although the above scheme has a certain buffering effect when dealing with sudden deceleration, it cannot effectively avoid the failure of the original traction force constraint caused by the downhill acceleration of the unpowered vehicle when the unpowered device suddenly accelerates due to terrain problems (such as a sloped downhill section, such as a common bridge or undulating section of the road). This may cause serious safety risks such as uncoupling, run, tail swing, and overturning of the unpowered vehicle.

[0006] (3) The above schemes often require the driver of the tractor to actively brake in order to be implemented. The braking effect and safety depend to a large extent on the driver's active braking behavior. If the driver does not operate properly, adverse consequences may easily occur.

[0007] Therefore, it is of great significance to study an unpowered vehicle including a drag damping system to solve the above problems. Summary of the invention

[0008] The purpose of the present invention is to solve the problems existing in the prior art and provide a non-powered vehicle including a drag damping system.

[0009] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0010] A non-powered vehicle including a drag damping system, the non-powered vehicle including the drag damping system comprising a drag damping system, a chassis, wheels and an axle; the axle passes through the chassis and is clearance-matched with the chassis; both ends of the axle are respectively fixedly connected to a wheel;

[0011] The drag damping system includes an inner wheel disc, an inner damping ring, an outer damping ring and a damping fixing plate;

[0012] The damping fixing plate is placed vertically and fixed on the chassis; a convex block A is provided on one side of the damping fixing plate; the outer damping ring is a circular ring structure, and the outer damping ring is fixed on the surface of the damping fixing plate provided with the convex block A; the central axis of the outer damping ring is perpendicular to the damping fixing plate;

[0013] The inner damping ring is a circular ring structure; the inner damping ring is located inside the outer damping ring, and the two are transitionally matched; a circle of ratchet teeth A is provided on the inner ring of the inner damping ring; the protrusion A is located inside the inner damping ring;

[0014] The inner wheel disc is a disc-shaped structure; a waist-shaped through hole is provided on the inner wheel disc; a circle of ratchet teeth B is provided on the circumference of the inner wheel disc;

[0015] A convex block B is provided on one side of the inner wheel disc; the inner wheel disc is arranged inside the inner damping ring, and the convex block B contacts the damping fixing plate; the central axis of the inner wheel disc coincides with the central axis of the inner damping ring;

[0016] The cross section of the shaft is a waist-shaped structure I; the cross section of the waist-shaped through hole is a waist-shaped structure II;

[0017] The length of the straight side of the waist-shaped structure II is greater than that of the straight side of the waist-shaped structure I. The distance between the two straight sides of the waist-shaped structure I is a, and the distance between the two straight sides of the waist-shaped structure II is b. The difference between b and a is in the range of 0.10-0.20 mm. When the shaft rotates within this range, the inner wheel also rotates at the same time.

[0018] The shaft includes a rectangular surface where two straight edges are located and two curved surfaces, and the inner wall of the waist-shaped through hole includes two curved inner side walls and a rectangular inner side wall where two straight edges are located;

[0019] When the inner wheel disc drives the inner damping ring to rotate, since the inner damping ring is located inside the outer damping ring and the two are in transitional fit, the friction between the inner damping ring and the outer damping ring hinders the rotation of the shaft, thereby hindering the movement of the unpowered vehicle. When the tractor accelerates, especially when accelerating downhill, the unpowered vehicle decelerates, thereby avoiding the unpowered vehicle's posture loss, resulting in uncoupling, running, tail swinging, overturning and other safety risks; when the tractor decelerates, the unpowered vehicle decelerates, avoiding the unpowered vehicle from impacting or colliding with the tractor due to inertia, eliminating safety hazards;

[0020] Among them, the reason why the inner wheel disc can be thrown out when accelerating or decelerating is specifically: during normal driving, the centripetal force of the inner wheel disc rotation is balanced. When there is acceleration, there will be extra inertial force, which will destroy the rotation balance and cause lateral sliding.

[0021] As the preferred technical solution:

[0022] In the above-mentioned unpowered vehicle including a drag damping system, a through hole A is provided on the damping fixing plate, and the through hole A is circular; the shaft passes through the through hole A and the waist-shaped through hole in sequence, and the shaft and the through hole A are clearance-matched, and a curved surface of the shaft is fitted with a curved inner side wall of the waist-shaped through hole; the shape design of the circular through hole A on the damping fixing plate can prevent the damping fixing plate from rotating when the shaft rotates;

[0023] The cross section of the shaft can also be a long strip, and the inner wheel disc is provided with a long strip through hole instead of a waist-shaped through hole; the cross section of the shaft is a long strip structure I, and the cross section of the long strip through hole is a long strip structure II;

[0024] The long side of the long strip structure II is greater than the long side of the long strip structure I; the distance between the two long sides of the long strip structure I is c, the distance between the two long sides of the long strip structure II is d, and the difference between d and c is in the range of 0.10-0.20 mm;

[0025] At this time, the axis includes the rectangular surface where the two long sides are located and the surface where the two short sides are located, and the inner wall of the long strip through hole also includes the inner side wall where the two short sides are located and the rectangular inner side wall where the two long sides are located;

[0026] At this time, the shaft passes through the through hole A and the long strip through hole in turn, and the shaft and the through hole A are clearance-matched, and the surface where one short side of the shaft is located is in contact with the inner side wall where one short side of the long strip through hole is located;

[0027] The unpowered vehicle of the towing damping system is connected to the tractor. When the tractor accelerates or decelerates, the inner wheel plate is displaced due to inertia and contacts the inner damping ring through the meshing of ratchet A and ratchet B. Then, under the rotation of the shaft, the inner wheel plate drives the inner damping ring to rotate; in the process of the inner wheel plate driving the inner damping ring to rotate, the bump A contacts the bump B; when the bump A contacts the bump B, the movement direction of the bump B is a, and the direction of the supporting force applied by the bump A to the bump B through the contact surface is b, the angle between a and b is less than 180 degrees, and the shaft is located within the angle range between a and b, that is, after the bump A contacts the bump B, under the action of the force, the inner wheel plate is displaced again, detaches from the inner damping ring, and moves toward the initial position;

[0028] In the unpowered vehicle including the drag damping system as described above, a spring push rod device is provided on the side of the inner wheel disc where the protrusion B is not provided. When the tractor is accelerating, moving at a constant speed or decelerating, the spring push rod device is always in contact with the shaft. The spring push rod device is used to apply pressure to the shaft to hinder the relative movement between the inner wheel disc and the shaft. With such a design, the drag damping system of the tractor traveling at a constant speed cannot work normally under a small acceleration or deceleration, thereby not affecting normal driving.

[0029] In the unpowered vehicle including the drag damping system as described above, the spring push rod device includes a fixing block, a fixing screw, a pressure spring and a sleeve;

[0030] The fixing block is fixed on the inner wheel disc, and a through hole B is provided on the fixing block; the screw of the fixing screw passes through the through hole B and is threadedly connected with the through hole B; the screw of the fixing screw passes through the through hole B and is inserted into the sleeve; the pressure spring is located in the sleeve, one end of the pressure spring is connected to the fixing screw, and the other end of the pressure spring is connected to the bottom of the sleeve;

[0031] The sleeve of the spring push rod device is in contact with the shaft, and when the sleeve of the spring push rod device is in contact with the shaft, the pressure spring is in a compressed state.

[0032] In the unpowered vehicle including the drag damping system as described above, the number of the spring push rod devices is two, each of which contacts a rectangular surface of the shaft.

[0033] As described above, a non-powered vehicle including a drag damping system, the drag damping system also includes plate A, plate B and an adjusting screw; the outer damping ring is an open circular structure; one end of the outer damping ring is connected to plate A, and the other end is connected to plate B; plate A and plate B are opposite to each other; plate A is provided with a through hole C, and plate B is provided with a through hole D; the adjusting screw passes through through hole C and through hole D in turn and is connected with a nut to adjust the distance between plate A and plate B, thereby adjusting the friction between the inner damping ring and the outer damping ring.

[0034] In the unpowered vehicle including the drag damping system as described above, along the length direction of the shaft, the sum of the lengths of the inner wheel disc and the protrusion B is ≤ the length of the inner damping ring;

[0035] The drag damping system also includes a stopper cover; the stopper cover is a circular plate, and a through hole E is provided on the stopper cover, and the diameter of the through hole E is smaller than the diameter of the inner wheel disc; the central axis of the through hole E coincides with the central axis of the stopper cover;

[0036] The stop cover is fixedly connected to the inner damping ring; the shaft passes through the through hole A, the waist-shaped through hole and the through hole E in sequence, and the stop cover is used to prevent the inner damping ring from flying out and prevent the protrusion B from contacting the damping fixing plate.

[0037] As described above, a non-powered vehicle including a drag damping system has a plurality of drag damping systems; the difference between the plurality of drag damping systems is only that the positions of the protrusions A on the surface where the damping fixing plate is located are different, and such a setting can achieve intermittent braking, presenting an effect similar to ABS anti-lock braking.

[0038] Beneficial effects:

[0039] (1) The present invention can hinder the movement of the unpowered vehicle by cooperating with the inner and outer damping rings and the inner wheel disc, so that the unpowered vehicle can decelerate even when the tractor vehicle accelerates or decelerates suddenly, thereby avoiding the unpowered vehicle's posture loss, resulting in safety risks such as uncoupling, running, tail swinging, and overturning. At the same time, it avoids the unpowered vehicle from impacting or colliding with the tractor vehicle due to inertia, eliminating safety hazards.

[0040] (2) The present invention applies pressure to the shaft through the spring push rod device to hinder the relative movement between the inner wheel disc and the shaft, so that the drag damping system of the tractor traveling at a constant speed cannot work normally under a small acceleration or deceleration, thereby not affecting normal driving.

[0041] (3) The present invention designs multiple drag damping systems and adjusts the position of the protrusion A on the surface where the damping fixing plate is located in the multiple drag damping systems to achieve intermittent braking, thereby avoiding the problem of being unable to brake when in use due to the dragging of multiple non-powered vehicles.

[0042] (4) The present invention can achieve the functions of braking and self-disengagement only by mechanical structure, achieving the significant effect of reducing impact and stabilizing the posture of the towing vehicle, and can be applied to multiple fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 An exploded diagram of a drag damping system of the present invention;

[0044] Figure 2 is a schematic diagram of an unpowered vehicle including a drag damping system according to the present invention;

[0045] Figure 3 is a schematic diagram of a drag damping system of the present invention;

[0046] Figure 4 It is a partial exploded view of the inner wheel disc and the spring push rod device of the present invention;

[0047] Figure 5 A schematic diagram of the inner wheel disc and spring push rod device of the present invention;

[0048] Figure 6 A top view of the inner wheel disc and the spring push rod device of the present invention;

[0049] Figure 7 is a schematic diagram of the inner wheel disc of the present invention;

[0050] Figure 8 It is a schematic diagram of an angle after the inner wheel disc of the present invention is connected to the fixing block;

[0051] Fig. 9 It is a schematic diagram of another angle after the inner wheel disc of the present invention is connected to the fixing block;

[0052] Fig.10 It is a schematic diagram of the inner wheel disc and the inner damping ring of the present invention;

[0053] Fig.11 It is a schematic diagram of the inner wheel disc and the inner damping ring of the present invention being gradually disengaged from the meshing state;

[0054] Fig.12 It is a schematic diagram of the inner wheel disc and the inner damping ring being completely separated from each other according to the present invention;

[0055] Fig.13 It is a front view of the shaft of the present invention;

[0056] Fig.14 is a side view of the shaft of the present invention;

[0057] Among them, 1-inner wheel disc, 2-inner damping ring, 3-outer damping ring, 4-damping fixing plate, 5-axle, 6-wheel, 7-chassis, 10-adjusting screw, 11-fixing screw, 12-waist-shaped through hole, 13-bump A, 14-bump B, 15-ratchet A, 16-ratchet B, 17-gear cover, 18-spring push rod device. DETAILED DESCRIPTION

[0058] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0059] An unpowered vehicle including a drag damping system, such as Figure 1 , Figure 2 As shown, the unpowered vehicle including the drag damping system includes a chassis, wheels 6, an axle 5 and a plurality of drag damping systems;

[0060] The shaft 5 passes through the chassis and is in clearance with the chassis; both ends of the shaft 5 are fixedly connected to a wheel 6 respectively;

[0061] The drag damping system includes an inner wheel disc 1, an inner damping ring 2, an outer damping ring 3, a damping fixing plate 4, a plate A, a plate B, an adjusting screw 10, a spring push rod device 18 and a stop cover 17;

[0062] like Figure 2 , Fig.10 As shown, the damping fixing plate 4 is placed vertically and fixed on the chassis 7; a through hole A is provided on the damping fixing plate 4, and the through hole A is circular; a convex block A 13 is provided on one side of the damping fixing plate 4;

[0063] The outer damping ring 3 is an open circular structure, and the outer damping ring 3 is fixed on the surface of the damping fixing plate 4 provided with the protrusion A 13; the central axis of the outer damping ring 3 is perpendicular to the damping fixing plate 4;

[0064] One end of the outer damping ring 3 is connected to the plate A, and the other end is connected to the plate B; the plate A and the plate B are opposite to each other; a through hole C is provided on the plate A, and a through hole D is provided on the plate B;

[0065] The inner damping ring 2 is a circular ring structure; the inner damping ring 2 is located inside the outer damping ring 3, and the two are transitionally matched; a circle of ratchet teeth A 15 is provided on the inner ring of the inner damping ring 2; the protrusion A 13 is located inside the inner damping ring 2;

[0066] like Figure 3 As shown, the adjusting screw 10 passes through the through hole C and the through hole D in sequence and is connected with a nut to adjust the distance between the plate A and the plate B, thereby adjusting the friction between the inner damping ring 2 and the outer damping ring 3;

[0067] The inner wheel disc 1 is a disc-shaped structure; a circle of ratchet teeth B 16 is provided on the circumference of the inner wheel disc 1; a waist-shaped through hole 12 is provided on the inner wheel disc 1;

[0068] like Figure 1 , Figure 7 As shown, a protrusion B 14 is provided on one side of the inner wheel disc 1; the inner wheel disc 1 is arranged inside the inner damping ring 2, and the protrusion B 14 contacts the damping fixing plate 4; the central axis of the inner wheel disc 1 coincides with the central axis of the inner damping ring 2;

[0069] like Figures 13 and 14As shown, the cross section of the shaft 5 is a waist-shaped structure I; the cross section of the waist-shaped through hole 12 is a waist-shaped structure II; the straight side length of the waist-shaped structure II is greater than the straight side length of the waist-shaped structure I; the distance between the two straight sides of the waist-shaped structure I is a, the distance between the two straight sides of the waist-shaped structure II is b, and the difference between b and a is in the range of 0.10-0.20 mm;

[0070] like Figure 1 , Figure 4~Figure 6 As shown, the spring push rod device 18 includes a fixing block, a fixing screw 11, a pressure spring and a sleeve;

[0071] like Figure 1 , Figure 7~Figure 9 As shown, the fixing block is fixed on the side of the inner wheel disc 1 where the protrusion B 14 is not provided, and a through hole B is provided on the fixing block;

[0072] The screw rod of the fixing screw 11 passes through the through hole B and is threadedly connected with the through hole B; the screw rod of the fixing screw 11 passes through the through hole B and is inserted into the sleeve and connected with one end of the pressure spring located in the sleeve, and the other end of the pressure spring is connected to the bottom of the sleeve;

[0073] The stop cover 17 is a circular plate, and a through hole E is provided on the stop cover 17. The diameter of the through hole E is smaller than the diameter of the inner wheel disc 1. The central axis of the through hole E coincides with the central axis of the stop cover 17.

[0074] The shaft 5 passes through the through hole A, the waist-shaped through hole 12 and the through hole E in sequence, and the shaft 5 is clearance-matched with the through hole A, and a curved surface of the shaft 5 is in contact with a curved inner wall of the waist-shaped through hole 12; the sleeve contacts a rectangular surface of the shaft 5, and when the sleeve contacts the shaft 5, the pressure spring is in a compressed state; there are two spring push rod devices 18, each of which contacts a rectangular surface of the shaft;

[0075] Along the length direction of the shaft 5, the sum of the lengths of the inner wheel disc 1 and the bump B 14 is ≤ the length of the inner damping ring 2; the stop cover 17 is threadedly fixedly connected to the inner damping ring 2;

[0076] like Figure 1 , Figure 3 , Figure 10~Figure 12 As shown, the unpowered vehicle including the drag damping system is connected to the tractor. When the tractor accelerates or decelerates, the inner wheel disc 1 is displaced due to inertia and contacts the inner damping ring 2 through the meshing of the ratchet A 15 and the ratchet B 16. Then, under the rotation of the shaft 5, the inner wheel disc 1 drives the inner damping ring 2 to rotate; in the process of the inner wheel disc 1 driving the inner damping ring 2 to rotate, the protrusion A 13 contacts the protrusion B 14; when the protrusion A 13 contacts the protrusion B 14, the movement direction of the protrusion B 14 is a, and the direction of the supporting force applied by the protrusion A 13 to the protrusion B 14 through the contact surface is b, the angle between a and b is less than 180 degrees, and the shaft 5 is located within the angle range between a and b;

[0077] The difference between the multiple drag damping systems is only that the positions of the protrusions A13 on the surface where the damping fixing plate 4 is located are different.

[0078] The use of the above device: Fig.11 , Fig.12 As shown, the above-mentioned unpowered vehicle including the drag damping system is connected to a tractor for use. When the tractor accelerates or decelerates, the inner wheel plate is displaced due to inertia and contacts the inner damping ring through the engagement of ratchet A and ratchet B. Then, under the rotation of the shaft, the inner wheel plate drives the inner damping ring to rotate, so that the protrusion A contacts the protrusion B, thereby realizing the unpowered deceleration including the drag damping system.

[0079] In particular, when there are multiple unpowered drag damping systems including the drag damping system, intermittent braking can be achieved when the tractor accelerates or decelerates because the positions of the protrusions A on the surface of the damping fixing plate are different between different drag damping systems.

Claims

1. An unpowered vehicle including a drag damping system, characterized in that: The unpowered vehicle including the drag damping system comprises the drag damping system, a chassis, wheels (6) and an axle (5); the axle (5) passes through the chassis and is clearance-matched with the chassis; both ends of the axle (5) are respectively fixedly connected to a wheel (6); The drag damping system comprises an inner wheel disc (1), an inner damping ring (2), an outer damping ring (3) and a damping fixing plate (4); The damping fixing plate (4) is placed vertically and fixed on the chassis; a protrusion A is provided on one side of the damping fixing plate (4); the outer damping ring (3) is a circular ring structure, and the outer damping ring (3) is fixed on the surface of the damping fixing plate (4) provided with the protrusion A; the central axis of the outer damping ring (3) is perpendicular to the damping fixing plate (4); The inner damping ring (2) is a circular ring structure; the inner damping ring (2) is located inside the outer damping ring (3), and the two are transitionally matched; a circle of ratchet teeth A is provided on the inner ring of the inner damping ring (2); the protrusion A is located inside the inner damping ring (2); The inner wheel disc (1) is a disc-shaped structure; a waist-shaped through hole is provided on the inner wheel disc (1); and a circle of ratchet teeth B is provided on the circumference of the inner wheel disc (1); A protrusion B is provided on one side of the inner wheel disc (1); the inner wheel disc (1) is arranged inside the inner damping ring (2), and the protrusion B contacts the damping fixing plate (4); the central axis of the inner wheel disc (1) coincides with the central axis of the inner damping ring (2); The cross section of the shaft (5) is a waist-shaped structure I; the cross section of the waist-shaped through hole is a waist-shaped structure II.

2. The unpowered vehicle comprising a drag damping system according to claim 1, characterized in that: A through hole A is provided on the damping fixing plate (4), and the through hole A is circular; the shaft (5) passes through the through hole A and the waist-shaped through hole in sequence, and the shaft (5) and the through hole A are clearance-matched, and a curved surface of the shaft (5) is in contact with a curved inner side wall of the waist-shaped through hole; The unpowered vehicle of the towing damping system is connected to a tractor. When the tractor accelerates or decelerates, the inner wheel disc (1) is displaced due to inertia and contacts the inner damping ring (2) through the meshing of ratchet teeth A and ratchet teeth B. Then, under the rotation of the shaft (5), the inner wheel disc (1) drives the inner damping ring (2) to rotate. In the process of the inner wheel disc (1) driving the inner damping ring (2) to rotate, the protrusion A contacts the protrusion B. When the protrusion A contacts the protrusion B, the movement direction of the protrusion B is a, and the direction of the supporting force applied by the protrusion A to the protrusion B through the contact surface is b. The angle between a and b is less than 180 degrees, and the shaft (5) is located within the angle range between a and b.

3. The unpowered vehicle comprising a drag damping system according to claim 2, characterized in that: A spring push rod device (18) is provided on a side of the inner wheel disc (1) that is not provided with the protrusion B. The spring push rod device (18) is always in contact with the shaft (5). The spring push rod device (18) is used to apply pressure to the shaft (5) to hinder the relative movement between the inner wheel disc (1) and the shaft (5).

4. The unpowered vehicle comprising a drag damping system according to claim 3, characterized in that: The spring push rod device (18) comprises a fixing block, a fixing screw (11), a pressure spring and a sleeve; The fixing block is fixed on the inner wheel disc (1), and a through hole B is provided on the fixing block; the screw rod of the fixing screw (11) passes through the through hole B and is threadedly connected with the through hole B; the screw rod of the fixing screw (11) passes through the through hole B and is inserted into the sleeve; the pressure spring is located in the sleeve, one end of the pressure spring is connected to the fixing screw (11), and the other end of the pressure spring is connected to the bottom of the sleeve; The sleeve of the spring push rod device (18) is in contact with the shaft (5), and when the sleeve of the spring push rod device (18) is in contact with the shaft (5), the pressure spring is in a compressed state.

5. The unpowered vehicle comprising a drag damping system according to claim 4, characterized in that: There are two spring push rod devices, each of which contacts a rectangular surface of the shaft.

6. The unpowered vehicle comprising a drag damping system according to claim 2, characterized in that: The drag damping system further comprises a plate A, a plate B and an adjusting screw (10); the outer damping ring (3) is an open circular structure; one end of the outer damping ring (3) is connected to the plate A, and the other end is connected to the plate B; the plate A and the plate B are opposite to each other; a through hole C is provided on the plate A, and a through hole D is provided on the plate B; the adjusting screw (10) passes through the through hole C and the through hole D in sequence and is connected with a nut to adjust the distance between the plate A and the plate B, thereby adjusting the friction between the inner damping ring (2) and the outer damping ring (3).

7. The unpowered vehicle comprising a drag damping system according to claim 2, characterized in that: Along the length direction of the shaft (5), the sum of the lengths of the inner wheel disc (1) and the protrusion B is ≤ the length of the inner damping ring (2); The drag damping system also includes a stopper cover; the stopper cover is a circular plate, and is provided with a through hole E, the diameter of the through hole E is smaller than the diameter of the inner wheel disc (1); the central axis of the through hole E coincides with the central axis of the stopper cover; The stop cover is fixedly connected to the inner damping ring (2); the shaft (5) passes through the through hole A, the waist-shaped through hole and the through hole E in sequence.

8. The unpowered vehicle comprising a drag damping system according to claim 2, characterized in that: The number of the drag damping systems in the unpowered vehicle including the drag damping system is multiple; the difference between the multiple drag damping systems is only that the positions of the protrusions A on the surface where the damping fixing plate (4) is located are different.

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