Automatic braking method and automatic braking mechanism of unpowered traveling device

Abstract

The present invention relates to the field of wheelchair travel control methods and discloses an automatic braking method and automatic braking mechanism for an unpowered travel device. A hydraulic pump linked to the wheels of the unpowered travel device is connected to the hydraulic pump, and the hydraulic pump serves as the hydraulic braking power source for the unpowered travel device. During the travel of the unpowered travel device, the running wheels drive the hydraulic pump to operate, and the operation of the hydraulic pump drives the circulation of brake medium fluid. A flow control valve is provided on the circulation flow path of the brake medium fluid, and the opening of the flow control valve is controlled to control the braking speed point of the unpowered travel device. When the travel speed of the unpowered travel device reaches the braking speed point, hydraulic braking is automatically performed. The automatic braking method provided by the present invention can not only achieve automatic braking, but also change the braking speed point to meet the braking application requirements of different types of unpowered travel devices.

Description

Technical Field

[0001] The present invention relates to the field of wheelchair travel control methods, and in particular to an automatic braking method and an automatic braking mechanism for a non-powered walking device. Background Art

[0002] Push wheelchairs, shopping carts, elderly walkers, and children's scooters are all very common non-powered mobility devices. Push wheelchairs are widely used as a means of transportation for the elderly, people with disabilities, and other mobility impairments. To improve the safety of non-powered mobility devices such as push wheelchairs, some are equipped with downhill speed limiters.

[0003] For example, the Chinese invention patent application with publication number CN111494113A and publication date 2020.08.07 discloses an automatic speed limiting device for a wheelchair, comprising a frame and an arc sleeve, wherein the arc sleeve is fixedly mounted on one side of the frame, a clutch that can stably close and link as the speed increases is rotatably mounted on the bottom of the frame, and an opener and closeer that can stably change the resistance is mounted on the top of the frame, and the opener and closeer are transmission-connected to the clutch; this automatic speed limiting device for a wheelchair is fixed to the wheelchair through the arc sleeve, and when the wheelchair moves at an excessive speed, the clutch is pushed by the airflow to rotate at a high speed, thereby touching the opener and closeer to open the windward side, thereby increasing the resistance of the device. Although this invention application has the function of automatically limiting the wheelchair, since it uses wind resistance to limit the speed, the braking speed limiting effect is not ideal. Not only is the sensitivity not high, but the braking force cannot be increased as the travel speed increases.

[0004] Another example is a Chinese invention patent application with publication number CN112914861A and publication date June 8, 2021, which discloses a downhill speed-limited anti-fall wheelchair. The wheelchair comprises a housing, a seating assembly disposed on the upper side of the housing, a reinforced forward assembly disposed on the front and rear sides of the housing, and a power generation test assembly disposed in the middle of the housing. The seating assembly comprises a seating mechanism for a user to sit on, and an anti-fall mechanism to prevent a passenger from falling forward when braking. The reinforced forward assembly comprises a forward mechanism for the wheelchair to move forward, and a stabilizing mechanism to make the wheelchair more stable when braking. The wheelchair can utilize the rotation of the wheels to generate electricity and store the electricity. When the speed is too fast, the wheels can be tilted to increase the stability of the vehicle and prevent the occurrence of rollover accidents. At the same time, the seat back rotates backward, causing the human body to lean back, preventing the passenger from being thrown out due to speed changes. While achieving the above two points, the wheel rotation speed is limited to reduce the speed. However, the invention does not involve a specific brake speed-limiting structure, but only achieves the purpose of anti-fall by improving the wheelchair structure. Summary of the Invention

[0005] The purpose of the present invention is to provide an automatic braking method and automatic braking mechanism for an unpowered walking device, which can output different braking forces according to different travel speeds, avoid the danger caused by excessive travel speed, and further provide at least a beneficial option or create conditions for solving one or more technical problems existing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions.

[0007] An automatic braking method for an unpowered traveling device, the main innovation of which lies in: connecting a hydraulic pump linked to the wheels of the unpowered traveling device, and using the hydraulic pump as the hydraulic braking power source of the unpowered traveling device; during the movement of the unpowered traveling device, the running wheels drive the hydraulic pump to operate, and the operation of the hydraulic pump drives the circulation of the brake medium fluid; a flow control valve is provided on the circulation flow path of the brake medium fluid, and the braking speed point of the unpowered traveling device is controlled by controlling the opening of the flow control valve. When the travel speed of the unpowered traveling device reaches the braking speed point, hydraulic braking is automatically performed.

[0008] More preferably, the hydraulic pump is a gear pump that can operate in forward and reverse directions, and a corresponding protection circuit is provided corresponding to the reverse operation of the hydraulic pump to prevent the hydraulic pump from idling, and a first one-way valve is provided on the protection circuit. The first one-way valve is used to prevent the brake medium fluid from flowing into the protection circuit when the hydraulic pump operates in the forward direction.

[0009] More preferably, the hydraulic pump is a gear pump capable of forward and reverse rotation, and a circulation flow circuit of the brake medium fluid is provided corresponding to the forward and reverse rotation of the hydraulic pump, and a corresponding flow control valve is provided on each of the circulation flow circuits.

[0010] More preferably, each of the circulation flow circuits shares one flow control valve.

[0011] More preferably, the braking force of the hydraulic brake increases with the increase of the inflowing brake fluid.

[0012] During the braking process, if the travel speed of the unpowered traveling device is still increasing, the amount of brake medium fluid output by the hydraulic pump will continue to increase, thereby allowing more brake medium fluid to enter the hydraulic braking mechanism and increase the braking force of the hydraulic brake.

[0013] During braking, if the speed of the unpowered traveling device decreases, the amount of brake fluid output by the hydraulic pump will decrease, thereby reducing the amount of brake fluid entering the hydraulic brake mechanism and the braking force of the hydraulic brake.

[0014] On the other hand, the present invention also provides an automatic braking mechanism for an unpowered traveling device, which is used to implement the automatic braking method as described above. The automatic braking device includes a medium liquid storage box, a hydraulic pump, several one-way valves, a flow control valve and a hydraulic braking mechanism; the medium liquid storage box is used to store braking medium liquid, and the hydraulic pump is connected to the wheels of the unpowered traveling device through a transmission mechanism, and the forward running direction of the hydraulic pump is consistent with the travel direction of the wheels of the unpowered traveling device; the forward inlet of the hydraulic pump is connected to the medium liquid storage box through a liquid inlet pipe, and the forward outlet of the hydraulic pump is connected to the hydraulic braking mechanism through a liquid outlet pipe, and the hydraulic braking mechanism is used to implement braking of the unpowered traveling device; a return pipe is connected between the connection node between the forward outlet of the hydraulic pump and the hydraulic braking mechanism and the medium liquid storage box, and the flow control valve is installed on the return pipe, and the flow regulating valve is a flow regulating valve with adjustable opening.

[0015] More preferably, a protection pipe is connected between the forward inlet and the forward outlet of the hydraulic pump, and the protection pipe and the hydraulic pump together constitute a reverse protection circuit.

[0016] More preferably, the hydraulic brake mechanism comprises a hydraulic chamber, a brake valve rod slidably mounted in the hydraulic chamber and sealed, and a return spring connected to the brake valve rod.

[0017] More preferably, the transmission mechanism is a gear transmission mechanism or a chain transmission mechanism, which can perform speed change according to actual needs.

[0018] More preferably, a second one-way valve is provided on the liquid inlet pipe, and the second one-way valve is unidirectionally conducted from the medium liquid storage box to the forward inlet direction of the hydraulic pump; a third one-way valve is provided on the liquid outlet pipe, and the third one-way valve is unidirectionally conducted from the forward outlet of the hydraulic pump to the direction of the braking mechanism, and the flow control valve is connected between the outlet of the third one-way valve and the medium liquid storage box; a second liquid inlet pipe is also connected between the forward outlet of the hydraulic pump and the medium liquid storage box, and a fourth one-way valve is provided on the second liquid inlet pipe, and the fourth one-way valve is unidirectionally conducted from the medium liquid storage box to the forward outlet direction of the hydraulic pump.

[0019] The technical solution provided by the present invention has at least the following technical effects or advantages.

[0020] First, a hydraulic pump is connected to the wheels of the unpowered travel device and serves as the hydraulic braking power source for the unpowered travel device. During operation, the rotating wheels drive the hydraulic pump, which, using a suction and discharge principle, delivers fluid to the hydraulic brake mechanism for braking. When the unpowered travel device's speed is below the braking speed point, the hydraulic pump outputs a small amount of fluid, which flows back into the fluid storage tank through a flow control valve, and the hydraulic brake mechanism does not activate. When the unpowered travel device's speed exceeds the braking speed point, the hydraulic pump outputs a large amount of fluid, which enters the hydraulic brake mechanism, activating it for braking, thus achieving automatic braking. Furthermore, the braking speed point of the unpowered travel device can be adjusted by varying the opening of the flow control valve. When the unpowered travel device reaches the braking speed point, hydraulic braking is automatically initiated. This meets the braking requirements of various unpowered travel devices, such as wheelchairs, shopping carts, and children's scooters.

[0021] 2. Since the braking force of the hydraulic brake will increase with the increase of the inflowing brake fluid during the braking process, and vice versa; thus, during the braking process, if the speed of the unpowered travel device is still increasing, the amount of brake fluid output by the hydraulic pump will continue to increase, thereby allowing more brake fluid to enter the hydraulic brake mechanism, increasing the braking force of the hydraulic brake, and avoiding the danger brought by the increasing travel speed; during the braking process, if the speed of the unpowered travel device is decreasing, the amount of brake fluid output by the hydraulic pump will decrease, thereby causing less brake fluid to enter the hydraulic brake mechanism and reducing the braking force of the hydraulic brake, thereby avoiding rollover, side slip, and forward rush of the human body caused by excessive deceleration, and the deceleration process is comfortable and safe.

[0022] 3. By setting up a two-way braking circuit, the forward and reverse two-way automatic braking of the unpowered walking device can be achieved. Regardless of whether the unpowered walking device is moving forward or reverse, it has an adaptive braking function, which is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shown is a structural schematic diagram of the automatic braking mechanism provided in Example 2 of the present invention.

[0024] Figure 2 Shown is a schematic diagram of the forward operating state of the automatic braking mechanism provided in Example 2 of the present invention.

[0025] Figure 3 Shown is a schematic diagram of the reverse operation state of the automatic braking mechanism provided by Example 2 of the present invention.

[0026] Figure 4 Shown is a structural schematic diagram of the automatic braking mechanism provided in Example 3 of the present invention.

[0027] Figure 5 Shown is a schematic diagram of the forward operating state of the automatic braking mechanism provided by Example 3 of the present invention.

[0028] Figure 6 Shown is a schematic diagram of the reverse operation state of the automatic braking mechanism provided by Example 3 of the present invention.

[0029] Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 The arrow in the middle represents the flow direction of the medium.

[0030] Description of the accompanying drawings.

[0031] 1: Medium liquid storage box, 2: Hydraulic pump, 3: Flow control valve, 4: Hydraulic brake mechanism, 5: Transmission mechanism, 6: Liquid inlet pipe, 7: Liquid outlet pipe, 8: Return pipe, 9: Protection pipe, 10: First one-way valve, 11: Second one-way valve, 12: Third one-way valve, 13: Second liquid inlet pipe, 14: Fourth one-way valve. DETAILED DESCRIPTION

[0032] The following description of the embodiments of the present invention is further described in conjunction with the accompanying drawings to make the technical solutions and beneficial effects of the present invention clearer and more specific. The following description of the embodiments with reference to the accompanying drawings is illustrative and intended to explain the present invention, but is not to be construed as limiting the present invention.

[0033] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention.

[0034] Example 1

[0035] An automatic braking method for an unpowered traveling device, the basic principle of which is to connect a hydraulic pump linked to the wheels of the unpowered traveling device, and use the hydraulic pump as the hydraulic braking power source of the unpowered traveling device; during the movement of the unpowered traveling device, the running wheels drive the hydraulic pump to operate, and the operation of the hydraulic pump drives the circulation of the brake medium fluid; a flow control valve is provided on the circulation flow path of the brake medium fluid, and the braking speed point of the unpowered traveling device is controlled by controlling the opening of the flow control valve. When the travel speed of the unpowered traveling device reaches the braking speed point, hydraulic braking is automatically performed.

[0036] During operation, the hydraulic pump is driven by the rotating wheels to rotate, and the hydraulic pump uses the suction and discharge working principle to transport the liquid to the hydraulic brake mechanism for braking. When the travel speed of the unpowered travel device is lower than the braking speed point, the amount of medium liquid output by the hydraulic pump is small, and the medium liquid flows back to the medium liquid storage box through the flow control valve, and the hydraulic brake mechanism does not operate. When the travel speed of the unpowered travel device is higher than the braking speed point, the amount of medium liquid output by the hydraulic pump is large, and the medium liquid enters the hydraulic brake mechanism, which operates to brake and achieve automatic braking. In addition, the braking speed point of the unpowered travel device can be changed by changing the opening of the flow control valve. When the travel speed of the unpowered travel device reaches the braking speed point, hydraulic braking is automatically performed to meet the braking application requirements of different types of unpowered travel devices such as hand wheelchairs, shopping carts, and children's scooters.

[0037] In this embodiment, the hydraulic pump is preferably a gear pump that can operate in forward and reverse directions. A corresponding protection circuit is provided corresponding to the reverse operation of the hydraulic pump to prevent the hydraulic pump from idling. A first one-way valve is provided on the protection circuit. The first one-way valve is used to prevent the brake medium fluid from flowing into the protection circuit when the hydraulic pump operates in the forward direction.

[0038] In some embodiments, a circulation flow circuit of the brake medium fluid is provided corresponding to the forward and reverse rotations of the hydraulic pump, and a corresponding flow control valve is provided on each of the circulation flow circuits.

[0039] In some embodiments, each of the circulating flow circuits can share one flow control valve, or different flow control valves can be set separately, so that the unpowered walking device has different braking speed points when moving forward and backward to meet different application requirements.

[0040] In this embodiment, it is preferred that the braking force of the hydraulic brake increases with the increase of the inflowing brake fluid, and vice versa.

[0041] During the braking process, if the travel speed of the unpowered traveling device continues to increase, the amount of brake medium fluid output by the hydraulic pump will continue to increase, thereby allowing more brake medium fluid to enter the hydraulic braking mechanism, increasing the braking force of the hydraulic brake, and avoiding the danger caused by the continuous increase in travel speed.

[0042] During the braking process, if the travel speed of the unpowered walking device decreases, the amount of brake medium fluid output by the hydraulic pump will decrease, thereby reducing the amount of brake medium fluid entering the hydraulic braking mechanism and reducing the braking force of the hydraulic brake, thereby avoiding rollover, side slip, and forward movement of the human body caused by excessive deceleration, making the deceleration process comfortable and safe.

[0043] Example 2

[0044] Reference Figure 1 As shown, an automatic braking mechanism of an unpowered traveling device includes a medium liquid storage tank 1, a hydraulic pump 2, several one-way valves, a flow control valve 3 and a hydraulic brake mechanism 4; the medium liquid storage tank is used to store brake medium liquid, the hydraulic pump 2 is connected to the wheel axle of the unpowered traveling device through a transmission mechanism 5, and the forward running direction of the hydraulic pump 2 is consistent with the travel direction of the wheel of the unpowered traveling device; the forward inlet of the hydraulic pump 2 is connected to the medium liquid storage tank 1 through a liquid inlet pipe 6, and the forward outlet of the hydraulic pump 2 is connected to the hydraulic brake mechanism 4 through a liquid outlet pipe 7, and the hydraulic brake mechanism 4 is used to realize the braking of the unpowered traveling device; a return pipe 8 is connected between the connection node between the forward outlet of the hydraulic pump 2 and the hydraulic brake mechanism 4 and the medium liquid storage tank 1, and the flow control valve 3 is installed on the return pipe 8, and the flow regulating valve 3 is a flow regulating valve 3 with adjustable opening (maximum conductance).

[0045] The brake medium fluid is preferably brake fluid. When the brake fluid is subjected to pressure, it quickly and evenly transmits the pressure to all parts of the fluid, achieving hydraulic braking. Obviously, those skilled in the art may also use other medium fluids currently known or to be developed in the future to replace the brake fluid, depending on actual needs; this is not limited to this embodiment.

[0046] In this embodiment, the medium liquid storage box 1 is preferably a hydraulic oil tank, and the hydraulic pump 2 is preferably a gear pump capable of forward and reverse rotation. In order to avoid reverse no-load and damage to the flow control valve 3, a protective pipe 9 is preferably connected between the forward inlet and the forward outlet of the hydraulic pump 2. A first one-way valve 10 is installed on the protective pipe 9. The first one-way valve 10 is unidirectional from the forward inlet to the forward outlet. In this way, when the hydraulic pump 2 is reversed, the medium liquid flows out from the forward inlet, passes through the first one-way valve 10, and then circulates into the forward outlet. Figure 3 and thus avoid reverse no-load and damage to the flow control valve 3. Since the first one-way valve 10 has no resistance in the forward direction, the medium fluid does not enter the brake mechanism 4 for braking.

[0047] In this embodiment, the flow control valve 3 can be a conventional throttle valve. The hydraulic brake mechanism 4 is a conventional brake mechanism comprising a hydraulic chamber, a brake valve rod slidably mounted and sealed within the hydraulic chamber, and a return spring connected to the brake valve rod. The transmission mechanism 5 can be a conventional gear transmission mechanism or a chain transmission mechanism.

[0048] In the present embodiment, the non-powered walking device is preferably a hand-propelled wheelchair. In some embodiments, the non-powered walking device can be a shopping cart, a walker for the elderly, or a children's scooter.

[0049] During operation, the transmission mechanism 5 drives the hydraulic pump 2 to rotate, and the hydraulic pump 2 uses the suction and discharge working principle to transport the liquid to the hydraulic brake mechanism 4 for braking. When the speed of the unpowered traveling device is lower than the braking speed point, the medium liquid output by the hydraulic pump 2 is small, and the medium liquid flows back to the medium liquid storage box 1 through the flow control valve 3, and the hydraulic brake mechanism 4 does not operate. When the speed of the unpowered traveling device is higher than the braking speed point, the medium liquid output by the hydraulic pump 2 is large, and the medium liquid enters the hydraulic brake mechanism 4, and the hydraulic brake mechanism 4 operates to brake, such as Figure 2 shown.

[0050] During the braking process, if the walking speed of the unpowered walking device is still increasing, the amount of medium fluid output by the hydraulic pump 2 will continue to increase, thereby allowing more medium fluid to enter the hydraulic brake mechanism 4, increasing the braking force of the hydraulic brake mechanism 4, and avoiding the danger caused by the continuous increase in travel speed; during the braking process, if the walking speed of the unpowered walking device is decreasing, the amount of medium fluid output by the hydraulic pump 2 will decrease, thereby causing less medium fluid to enter the hydraulic brake mechanism 4 and reducing the braking force of the hydraulic brake mechanism 4, avoiding rollover, side slip, human body forward rush, etc. caused by excessive deceleration, and the deceleration process is comfortable and safe.

[0051] Example 3

[0052] Reference Figure 4 As shown, an automatic braking mechanism of an unpowered traveling device has a structure that is basically the same as that of Example 2, except that the automatic braking mechanism of an unpowered traveling device provided in this embodiment has a bidirectional braking function.

[0053] In order to realize the bidirectional braking function, a second one-way valve 11 is provided on the liquid inlet pipe 6, and the second one-way valve 11 is unidirectional from the medium liquid storage box 1 to the forward inlet direction of the hydraulic pump 2; a third one-way valve 12 is provided on the liquid outlet pipe 7, and the third one-way valve 12 is unidirectional from the forward outlet of the hydraulic pump 2 to the direction of the braking mechanism 4, and the flow control valve 3 is connected between the outlet of the third one-way valve 12 and the medium liquid storage box 1; a second liquid inlet pipe 13 is also connected between the forward outlet of the hydraulic pump 2 and the medium liquid storage box 1, and a fourth one-way valve 14 is provided on the second liquid inlet pipe 13, and the fourth one-way valve 14 is unidirectional from the medium liquid storage box 1 to the forward outlet direction of the hydraulic pump 2.

[0054] Reference Figure 5As shown, when hydraulic pump 2 is operating in the forward direction, the medium fluid is drawn from the medium fluid storage tank 1 by the hydraulic pump 2, flows sequentially through the second one-way valve 11, hydraulic pump 2, third one-way valve 12, and flow control valve 3, and then returns to the medium fluid storage tank 1 to complete the circulation. When the speed of the unpowered travel device is lower than the braking speed point, the amount of medium fluid output by hydraulic pump 2 is small, the medium fluid flows back to the medium fluid storage tank 1 through flow control valve 3, and the hydraulic brake mechanism 4 does not operate. When the speed of the unpowered travel device is higher than the braking speed point, the amount of medium fluid output by hydraulic pump 2 is large, the medium fluid enters the hydraulic brake mechanism 4, and the hydraulic brake mechanism 4 operates to apply the brake.

[0055] Reference Figure 6 As shown, when hydraulic pump 2 operates in reverse, the medium fluid is drawn from the medium fluid storage tank 1 by the hydraulic pump 2, flows sequentially through the fourth one-way valve 14 on the second liquid inlet pipe 13, the hydraulic pump 2, the first one-way valve 10, and the flow control valve 3, and then returns to the medium fluid storage tank 1 to complete the circulation. When the speed of the unpowered traveling device is lower than the braking speed point, the amount of medium fluid output by hydraulic pump 2 is small, the medium fluid flows back to the medium fluid storage tank 1 through the flow control valve 3, and the hydraulic brake mechanism 4 does not operate. When the speed of the unpowered traveling device is higher than the braking speed point, the amount of medium fluid output by hydraulic pump 2 is large, the medium fluid enters the hydraulic brake mechanism 4, and the hydraulic brake mechanism 4 operates to apply the brake.

[0056] This embodiment provides an automatic braking mechanism for an unpowered traveling device, which, in addition to having all the technical effects of the first embodiment, also achieves braking when the unpowered traveling device is traveling in reverse at an excessively fast speed.

[0057] It should also be noted that, in the description of the present invention, directional words such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and should not be understood as limiting the specific scope of protection of the present invention.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Therefore, the terms "first" and "second" may explicitly or implicitly include one or more of these features. Throughout the description of the present invention, "at least" means one or more than one, unless otherwise specifically defined.

[0059] In the present invention, unless otherwise specified or limited, the terms "assemble," "connect," and "connect" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection; direct connection, connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0060] In the present invention, unless otherwise specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature therebetween. Furthermore, a first feature being "above," "below," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "above," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0061] Through the description of the above structure and principle, those skilled in the art should understand that the present invention is not limited to the above specific embodiments. Improvements and substitutions based on the present invention using the known technology in the art fall within the scope of protection of the present invention, which is defined by the claims and their equivalents. Any parts not described in the specific embodiments are prior art or common knowledge.

Claims

1. An automatic braking mechanism for an unpowered traveling device, characterized in that: A hydraulic pump linked to the wheels of the unpowered traveling device is connected, and the hydraulic pump serves as a hydraulic braking power source for the unpowered traveling device. During the movement of the unpowered traveling device, the running wheels drive the hydraulic pump to operate, and the operation of the hydraulic pump drives the circulation of brake medium fluid. A flow control valve is provided on the circulation flow path of the brake medium fluid, and the braking speed point of the unpowered traveling device is controlled by controlling the opening of the flow control valve. When the travel speed of the unpowered traveling device reaches the braking speed point, hydraulic braking is automatically performed. The automatic braking mechanism includes a medium liquid storage box, a hydraulic pump, several one-way valves, a flow control valve and a hydraulic brake mechanism; the medium liquid storage box is used to store brake medium liquid, the hydraulic pump is connected to the wheels of the unpowered running device through a transmission mechanism, and the transmission mechanism is a gear transmission mechanism or a chain transmission mechanism; the forward running direction of the hydraulic pump is consistent with the travel direction of the wheels of the unpowered running device; the forward inlet of the hydraulic pump is connected to the medium liquid storage box through a liquid inlet pipe, and the forward outlet of the hydraulic pump is connected to the hydraulic brake mechanism through a liquid outlet pipe, and the hydraulic brake mechanism is used to realize the braking of the unpowered running device; a return pipe is connected between the connection node between the forward outlet of the hydraulic pump and the hydraulic brake mechanism and the medium liquid storage box, and the flow control valve is installed on the return pipe, and the flow control valve is a flow regulating valve with adjustable opening; A protection pipe is connected between the forward inlet and the forward outlet of the hydraulic pump. The protection pipe and the hydraulic pump together form a reverse rotation protection circuit. A first one-way valve is provided on the reverse rotation protection circuit. The first one-way valve conducts unidirectionally in the direction from the forward inlet to the forward outlet of the hydraulic pump. A second one-way valve is provided on the liquid inlet pipe, and the second one-way valve is unidirectional from the medium liquid storage box to the forward inlet direction of the hydraulic pump; a third one-way valve is provided on the liquid outlet pipe, and the third one-way valve is unidirectional from the forward outlet of the hydraulic pump to the direction of the braking mechanism, and the flow control valve is connected between the outlet of the third one-way valve and the medium liquid storage box; a second liquid inlet pipe is also connected between the forward outlet of the hydraulic pump and the medium liquid storage box, and a fourth one-way valve is provided on the second liquid inlet pipe, and the fourth one-way valve is unidirectional from the medium liquid storage box to the forward outlet direction of the hydraulic pump.

2. The automatic braking mechanism of the unpowered traveling device according to claim 1, characterized in that: The hydraulic brake mechanism comprises a hydraulic chamber, a brake valve rod which is slidably mounted in the hydraulic chamber and sealed, and a return spring connected to the brake valve rod.

3. The automatic braking mechanism of the unpowered traveling device according to claim 1, characterized in that: The hydraulic pump is a gear pump that can be rotated forward and reverse.

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