A trolley

Abstract

The present application provides a kind of trolley, it is related to garden tool technical field, comprising: car body assembly;Driving wheel, be connected on the car body assembly by wheel axle, the driving wheel can rotate around wheel axle;Power assembly, is fixed in the hub of driving wheel, driving the rotation of the driving wheel;Brake assembly, is arranged on driving wheel, realizes the brake of driving wheel;Control device, is fixed on the car body assembly, and with power assembly, brake assembly electric connection;Brake assembly includes: first brake component, is fixed at driving wheel, realizes the brake of driving wheel;Second brake component, is fixed on the push rod of car body assembly, and is connected with first brake component by cable, and second brake component is electrically connected with control device by signal line;When brake assembly is in braking state, control connection between control device and power assembly is disconnected.The present application improves the problem that brake mechanism and driving device are simultaneously operated when trolley brakes in prior art.

Description

Technical Field

[0001] This invention relates to the field of garden tools technology, and in particular to a handcart. Background Technology

[0002] Handcarts are frequently used and indispensable tools in daily life, mainly for transporting goods over short distances. In modern life, we need to use all kinds of handcarts, such as those used by hotel staff to carry leftover food, bed sheets, blankets, and other items for guests, or by construction workers to carry sand, cement, bricks, and so on. These handcarts greatly facilitate our lives.

[0003] Currently, most handcarts on the market consist of a cart bed, a frame, a push rod, and casters. However, some existing handcarts lack a braking mechanism. Using such handcarts in certain everyday situations can be dangerous. For example, when pushing a heavy cart on a slope, if the user becomes exhausted, falls, runs out of power, or accidentally lets go of the cart while chatting with an acquaintance, the cart may roll backward and become uncontrollable, causing damage to property and personal safety.

[0004] In addition, some existing handcarts on the market contain braking mechanisms. However, when the braking mechanism of a traditional handcart is used in an electric handcart, there is no control device to regulate the braking mechanism and the drive device. This may cause the braking mechanism and the drive device to operate at the same time, which greatly reduces the braking performance of the braking mechanism. In severe cases, it may cause the braking mechanism to fail, resulting in serious accidents and damage to property and personal safety.

[0005] In conclusion, there are areas for improvement in the existing handcart technology. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a handcart that solves the problem that when a handcart brakes, the braking mechanism and the drive device operate simultaneously, which greatly reduces the braking performance of the braking mechanism or even causes braking failure, potentially leading to serious accidents.

[0007] To achieve the above and other related objectives, the present invention provides a handcart, comprising: a body assembly; a drive wheel connected to the body assembly via an axle, the drive wheel being rotatable around the axle; a power assembly fixed within the hub of the drive wheel, driving the drive wheel to rotate; a brake assembly disposed on the drive wheel, realizing braking of the drive wheel; a control device fixed to the body assembly and electrically connected to the power assembly and the brake assembly; and a power supply device fixed to the body assembly and electrically connected to the power assembly and the control device; the brake assembly comprises: a first brake component fixed at the drive wheel, realizing braking of the drive wheel; and a second brake component fixed to a push rod of the body assembly and connected to the first brake component via a cable, and the second brake component being electrically connected to the control device via a signal line; when the brake assembly is in a braking state, the control connection between the control device and the power assembly is disconnected.

[0008] In one embodiment of the present invention, the first brake component includes: a brake drum, coaxially fixed to the hub of the drive wheel and forming a receiving cavity; a brake cover, fixedly connected to the vehicle body assembly and closing the opening of the receiving cavity; at least two brake shoes, detachably fixedly connected to the brake cover, and an elastic element is provided between the two brake shoes and elastically connected through the elastic element; at least two brake pads, abutting the surface of the brake shoes and corresponding to the inner sidewall of the receiving cavity; an adjusting rod, one end of which is clamped between the two brake shoes, and the other end passing through the brake cover and rotatably connected to the brake cover; and an adjusting bracket, one end of which is fixedly connected to the adjusting rod, and the other end of which is drively connected to the second brake component through a cable.

[0009] In one embodiment of the present invention, the elastic element includes a tension spring, the two ends of which are respectively connected to the connecting holes at the same end of the two brake shoes.

[0010] In one embodiment of the present invention, a cable connected to the adjusting bracket is fitted with a wire tube, and a stop block is fixed at one end of the wire tube near the adjusting bracket, and the stop block is fixed to the vehicle body bracket in the vehicle body assembly.

[0011] In one embodiment of the present invention, a first reset spring is sleeved on the cable connected to the adjusting bracket and is located between the stop block and the adjusting bracket.

[0012] In one embodiment of the present invention, the second brake component includes: a mounting sleeve fitted onto a push rod in the vehicle body assembly; a brake handle rotatably connected to the mounting sleeve via a rotating shaft; a cable, one end of which is fixedly connected to the brake handle and the other end of which is fixedly connected to the adjusting bracket; a brake switch fixed on the mounting sleeve and linked with the brake handle to realize the closing or opening of the brake switch; and a signal line electrically connected to the brake switch and the control device.

[0013] In one embodiment of the present invention, a second return spring is sleeved on the rotating shaft connecting the brake handle and the mounting sleeve.

[0014] In one embodiment of the present invention, two cables are provided on the brake handle, and each cable corresponds to the first brake component and the second brake component.

[0015] In one embodiment of the present invention, the vehicle assembly includes: a truck bed; a push rod fixed to one side of the truck bed and used to mount the control device and the second brake component; and a vehicle body bracket mounted at the bottom of the truck bed and used to mount the drive wheel.

[0016] In one embodiment of the present invention, a caster wheel is also fixed to the bottom of the vehicle body bracket.

[0017] In one embodiment of the present invention, a cavity is formed inside the hub of the drive wheel for mounting the powertrain and the first brake component.

[0018] In one embodiment of the present invention, the powertrain includes: a hub motor mounted in the cavity on the drive wheel; both ends of the motor shaft of the hub motor passing through the waist-shaped groove of the vehicle body bracket and fixedly connected to the vehicle body bracket; the rotor core of the hub motor being fixedly connected to the side wall of the cavity; and a positioning component being installed at the connection between the motor shaft of the hub motor and the vehicle body bracket.

[0019] In one embodiment of the present invention, the positioning component includes: a positioning washer, coaxially passing through both ends of the motor shaft of the hub motor, and a boss formed on the positioning washer, the boss being embedded in the waist-shaped groove of the vehicle body bracket; and a fixing nut, threadedly connected to both ends of the motor shaft of the hub motor.

[0020] In one embodiment of the present invention, the power supply device includes: a battery box fixed on the vehicle body bracket of the vehicle body assembly; a battery pack cavity formed inside the battery box; a battery pack detachably fixed inside the battery pack cavity; and a power cable electrically connecting the battery pack and the hub motor in the powertrain.

[0021] In one embodiment of the present invention, two battery pack cavities are provided on the battery box.

[0022] As described above, the handcart of the present invention has the following beneficial effects:

[0023] 1. By electrically connecting the second brake component to the control device via a signal line, the control connection between the control device and the powertrain is disconnected when the brake assembly is in braking mode, thereby effectively improving the braking performance and braking safety of the brake assembly.

[0024] 2. By using a second braking component to control the first braking components on the two drive wheels, both drive wheels can be braked simultaneously, which can improve braking timeliness and safety, as well as improve the integration of the brake assembly, reduce the number of brake assembly parts, and reduce production costs.

[0025] 3. By installing hub motors on both drive wheels and controlling both hub motors simultaneously through a control device, the two drive wheels can operate at the same time, improving the power performance of the drive wheels and the stability of the vehicle body during operation; a first braking component is installed on both drive wheels, enabling simultaneous braking of both drive wheels, allowing for rapid stopping without sideslip, making the handcart safer to operate. Attached Figure Description

[0026] Figure 1 The image shown is an isometric view of a handcart according to an embodiment of the present invention.

[0027] Figure 2 The diagram shown is a structural schematic of the vehicle body support of a handcart according to one embodiment of the present invention.

[0028] Figure 3 The diagram shows the installation of the drive wheel in one embodiment of a handcart according to the present invention;

[0029] Figure 4 The diagram shown is an exploded view of the drive wheel mounting location in one embodiment of a handcart according to the present invention.

[0030] Figure 5 The image shown is a cross-sectional view of the drive wheel of a handcart according to one embodiment of the present invention;

[0031] Figure 6 The diagram shows the external structure of the first braking component of a handcart in one embodiment of the present invention.

[0032] Figure 7 The diagram shows the internal structure of the first brake component in one embodiment of a handcart according to the present invention.

[0033] Figure 8 Displayed as Figure 7The enlarged view of part A in the middle mainly shows the connection diagram of the two brake pads;

[0034] Figure 9 The diagram shows an assembly schematic of the adjusting rod in one embodiment of a handcart according to the present invention;

[0035] Figure 10 Displayed as Figure 9 The enlarged view of part B in the middle mainly shows the structural schematic diagram of the adjusting rod;

[0036] Figure 11 The diagram shows an assembly of a handcart according to an embodiment of the present invention, in which a second brake component is mounted on a push rod.

[0037] Figure 12 The diagram shows a structural schematic of the second brake component of a handcart according to an embodiment of the present invention.

[0038] Figure 13 Displayed as Figure 12 The enlarged view of part B in the middle mainly shows the structural schematic diagram of the card slot and the socket;

[0039] Figure 14 The diagram shows the circuitry between the control unit, brake switch, hub motor, and power supply.

[0040] Component designation explanation

[0041] 1. Vehicle body assembly; 11. Cargo bed; 12. Push rod; 121. Hook; 13. Vehicle body bracket; 131. Support plate; 132. Waist-shaped groove; 133. Opening; 2. Wheel assembly; 21. Drive wheel; 22. Caster wheel; 23. Positioning component; 231. Positioning washer; 232. Fixing nut; 233. Boss; 3. Powertrain; 31. Hub motor; 32. Motor shaft; 321. Flat shaft; 4. Brake assembly; 41. First brake component; 411. Brake drum; 411 1. Receiving cavity; 412. Brake cover; 4121. Support rod; 413. Brake shoe; 4131. Semicircular groove; 4132. Connecting hole; 414. Brake pad; 415. Adjusting rod; 416. Adjusting bracket; 4161. Insertion hole; 417. Tension spring; 418. First return spring; 42. Second brake component; 421. Mounting sleeve; 4211. Ear plate; 4212. Slot; 422. Brake handle; 4221. Snap-fit ​​groove; 4222. Contact plate; 423. Cable; 4231. Snap-fit ​​block; 424. Brake switch; 425. Signal line; 426. Conduit; 4261. Stop block; 427. Rotating shaft; 428. Second return spring; 5. Control device; 6. Power supply device; 61. Battery box; 62. Battery pack cavity; 63. Battery pack. Detailed Implementation

[0042] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. It should also be understood that the terminology used in the embodiments of the present invention is for describing specific implementation schemes and not for limiting the scope of protection of the present invention. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0043] Please see Figures 1 to 14 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness or purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0044] Please see Figure 1 and Figure 2 The present invention provides a handcart, including a body assembly 1; a wheel assembly 2, which rotates at the bottom of the body assembly 1; a power assembly 3, which is fixed in the wheel hub of the wheel assembly 2 and drives the movement of the wheel assembly 2; a brake assembly 4, which is disposed on the wheels of the wheel assembly 2 and realizes braking of the wheel assembly 2; a control device 5, which is fixed on the body assembly 1 and electrically connected to the power assembly 3 and the brake assembly 4; and a power supply device 6, which is fixed on the body assembly 1 and electrically connected to the power assembly 3 and the control device 5.

[0045] Please see Figure 1 and Figure 2In this embodiment, the vehicle assembly 1 includes a truck bed 11, a push rod 12, and a vehicle frame 13. The truck bed 11 can carry waste generated during landscaping operations or tools required for the operations. It should be noted that the handcart mentioned in this invention can be used not only in landscaping operations but also in other engineering fields. The bottom of the truck bed 11 is fixedly connected to the truck bed frame 13 by bolts. The vehicle frame 13 can support the truck bed 11 and also provides installation conditions for the wheel assembly 2, power assembly 3, control device 5, and power supply device 6. The push rod 12 is U-shaped, and its two ends are fixed to the side wall of the truck bed 11 by bolts. Hooks 121 are formed at both connection points between the push rod 12 and the truck bed 11. In addition, the control device 5 and part of the brake assembly 4 are mounted on the push rod 12 for easy operation.

[0046] Please see Figure 1 and Figure 2 In this embodiment, the wheel assembly 2 includes a drive wheel 21 and a swivel wheel 22. Both the drive wheel 21 and the swivel wheel 22 are mounted on the vehicle frame 13. The drive wheel 21 serves as the front wheel of the entire wheel assembly 2, and the swivel wheel 22 serves as the rear wheel of the entire wheel assembly 2. This front-wheel drive and rear-wheel steering configuration gives the handcart high rotational efficiency and sensitive steering. The drive wheel 21 and the swivel wheel 22 are symmetrically arranged at the bottom of the vehicle frame 13, employing a four-wheel structure, which effectively ensures the balance and stability of the handcart.

[0047] Please see Figure 3 The vehicle body support 13 includes support plates 131, and four support plates 131 are provided on the vehicle body support 12 and arranged along the width direction of the truck bed 11. A drive wheel mounting position (not shown in the figure) is formed between every two support plates 131, and the two drive wheel mounting positions correspond to the two sides of the width direction of the truck bed 11. Two drive wheels 21 are set in the corresponding mounting positions. A cavity (not shown in the figure) is formed in the hub of the drive wheel 21 for mounting the powertrain 3 and part of the brake assembly 4. It needs to be explained that... Each support plate 131 has a waist-shaped groove 132, and the waist-shaped groove 132 is located at the edge of the support plate 131. An opening 133 is opened on one side wall of the waist-shaped groove 132, and the length of the opening 133 is smaller than the length of the waist-shaped groove 132. The axes of the waist-shaped grooves 132 on each support plate 131 are on the same straight line. The motor shaft 32 is placed in the waist-shaped groove 132 through the opening 133 and is engaged and fixed with the waist-shaped groove 132, thereby realizing the installation and fixation of the drive wheel 21.

[0048] Please see Figure 1 and Figure 2In this embodiment, a powertrain 3 and a partial brake assembly 4 are installed on each of the two drive wheels 21. The powertrain 3 is installed on each of the two drive wheels 21, and the two powertrains 3 are simultaneously controlled by the control device 5, enabling the two drive wheels 21 to operate simultaneously, improving the power performance of the drive wheels 21 and the stability of the vehicle body during operation. The partial brake assembly 4 is installed on each of the two drive wheels 21, enabling simultaneous braking of both drive wheels 21, allowing for rapid stopping without skidding, thus making the handcart safer to operate.

[0049] Please see Figure 3 , Figure 4 and Figure 5 The powertrain 3 includes a hub motor 31. In this embodiment, the hub motor 31 is an external rotor type, such as a low-speed external rotor motor. The hub motor 31 is composed of components such as a motor shaft 32, a rotor core (not shown in the figure), and a permanent magnet (not shown in the figure). Both ends of the motor shaft 32 are formed with flat shafts 321, and the flat part of the flat shaft 321 is adapted to the size of the opening 133. The flat shaft 321 passes vertically through the corresponding opening 133 and is placed horizontally in the corresponding waist-shaped groove 132, so that both ends of the motor shaft 32 are respectively engaged and fixed with the corresponding support plate 131. The motor shaft 32 is rotatably connected to the hub of the drive wheel 21 through bearings. The rotor core of the hub motor 31 is fixedly connected to the side wall of the inner cavity of the drive wheel 21 through a rotor bracket. When the rotor of the hub motor 31 rotates, it drives the drive wheel 21 to rotate.

[0050] Please see Figure 3 , Figure 4 and Figure 5 In this invention, a positioning component 23 is installed at the connection between the motor shaft 32 of the hub motor 31 and each support plate 131. In this embodiment, the positioning component 23 includes a positioning washer 231 and a fixing nut 232. The positioning washer 231 is coaxially inserted through both ends of the motor shaft 32 in the hub motor 31 and located between the support plate 131 and the fixing nut 232. A boss 233 is formed on the positioning washer 231, which is embedded in the waist-shaped groove 132 of the support plate 131, securing both ends of the motor shaft 32 within the groove. The fixing nut 232 is threaded to both ends of the motor shaft 32 and abuts against the positioning washer 231, thus achieving the installation of the drive wheel 21 and the hub motor 31. It should be noted that the two ends of the motor shaft 32, the waist-shaped groove 132 on the support plate 131, and the positioning washer 231 all adopt a waist-shaped structure, and their mutual assembly greatly improves the stability of the installation of the drive wheel 21 and the hub motor 31.

[0051] Please see Figure 1 and Figure 2The brake assembly 4 includes a first brake component 41 and a second brake component 42. The first brake component 41 is fixed in the cavity of the drive wheel 21 to brake the drive wheel 21, and the second brake component 42 is fixed on the push rod 12. There are two first brake components 41 on the handcart, corresponding one-to-one with the two drive wheels 21. The second brake component 42 includes two cables 423 and a signal line 425, and is connected to the two first brake components 41 through the two cables 423. One second brake component 42 can control the first brake components 41 on the two drive wheels 21, so that the two drive wheels 21 can brake simultaneously, which can improve braking timeliness and safety, improve the integration of the brake assembly 4, reduce the number of parts of the brake assembly 4, and reduce production costs. Furthermore, by electrically connecting the second brake component 42 to the control device 5 through the signal line 425, the control connection between the control device 5 and the hub motor 31 is disconnected when the brake assembly 4 is in the braking state, thereby effectively improving the braking performance and braking safety of the brake assembly 4.

[0052] Please see Figures 5 to 9 In this embodiment, the first brake component 41 includes a brake drum 411, a brake cover 412, brake shoes 413, brake pads 414, an adjusting rod 415, and an adjusting bracket 416. The brake drum 411 is coaxially fixed to the hub of the drive wheel 21, and has a receiving cavity 4111 inside. The side of the receiving cavity 4111 away from the hub motor 31 is open and used to install components such as brake shoes 413 and brake pads 414. The brake cover 412 is fixed to the support plate 131 by bolts and closes the open side of the receiving cavity 4111. The brake cover 412 has a through hole structure (not shown in the figure) coaxially opened on it for the motor shaft 32 to pass through. It should be noted that the support plate 131 fixedly connected to the brake cover 412 is the support plate 131 on the outside of the drive wheel 21. In addition, a support rod 4121 is fixed on the brake cover 412 and extends into the receiving cavity 4111, which can support and position the brake shoes 413.

[0053] Please see Figure 5 , Figure 6 and Figure 7Brake shoes 413 are placed inside the receiving cavity 4111. In this embodiment, two brake shoes 413 are provided inside the receiving cavity 4111. The two brake shoes 413 have the same shape and structure, both being semi-circular. The brake shoes 413 are formed with an arc surface that matches the inner sidewall of the receiving cavity 4111. The brake pad 414 is fixed on the arc surface and corresponds one-to-one with the brake shoes 413. In addition, the two brake shoes 413 have a semi-circular groove 4131 at one end that abuts against each other. By engaging the two semi-circular grooves 4131 with the support rod 4121 on the brake cover 412, the two brake shoes 4123 are supported. The other ends of the two brake shoes 413 clamp one end of the adjusting rod 415. The rotation of the adjusting rod 415 can expand the two brake shoes 413, thereby causing the brake pad 414 to abut against the inner sidewall of the receiving cavity 4111, achieving the braking effect.

[0054] Please see Figure 7 and Figure 8 Both ends of the brake pads 413 are provided with connecting holes 4132, and the connecting holes 4132 on the two brake pads 413 are identical in position, shape and size. An elastic element is provided between the two brake pads 413, and they are elastically connected by the elastic element. In this embodiment, the elastic element includes a tension spring 417; both ends of the tension spring 417 are respectively hooked to the connecting holes 4132 at the same end on the two brake pads 413, and two tension springs 417 are provided on the brake pads 413, corresponding one-to-one with the two ends of the two brake pads 413 that abut against each other.

[0055] Please see Figure 9 and Figure 10One end of the adjusting rod 415 is block-shaped and clamped between two brake shoes 413. When the drive wheel 21 is running normally, the block-shaped end of the adjusting rod 415 is set vertically. At this time, the two brake shoes 414 do not contact the brake drum and there is no braking force. When the drive wheel 21 is braking, the adjusting rod 415 rotates through the adjusting bracket 416 and its block-shaped end is set horizontally, which can spread the two brake shoes 413 apart. At this time, the two brake shoes 414 contact the brake drum 411 and generate braking force, thereby braking the drive wheel 21. The other end of the adjusting rod 415 extends through the brake cover 412 to the outside of the receiving cavity 4111 and is fixedly connected to one end of the adjusting bracket 416. The adjusting rod 415 is rotatably connected to the brake cover 412 via a bearing. The end of the adjusting rod 415 fixed to the adjusting bracket 416 is engaged with a locking tooth structure. Specifically, the end of the adjusting rod 415 extending outside the receiving cavity 4111 has locking teeth (not shown in the figure) along its circumference. An insertion hole 4161 is provided on the adjusting bracket 416 at the connection point with the adjusting rod 415. A groove (not shown in the figure) is provided on the wall of the insertion hole 4161. The locking teeth and the groove engage to achieve a fixed connection. Furthermore, the adjusting bracket 416 also employs a clamping structure, where one side of the insertion hole 4161 is opened along the axis perpendicular to the axis of the insertion hole 4161, and the insertion hole 4161 is secured with bolts. The hole wall and the adjusting rod 415 are tightly interlocked, realizing the detachable connection between the adjusting rod 415 and the adjusting bracket 416.

[0056] Please see Figures 11 to 14 The other end of the adjusting bracket 416 is connected to the first braking component 41 via a cable 423. A conduit 426 is fitted on the cable 423 to protect it. A stop block 4261 is fixed to one end of the cable 423 near the adjusting bracket 416 and is fixed to the support plate 131. A first return spring 418 is also fitted on the cable 423, and both ends of the first return spring 418 are respectively pressed against the stop block 4261 and the adjusting bracket 416. In actual operation, the user drives the adjusting bracket 416 to rotate via the cable 423 in the first braking component 41, thereby compressing the first return spring 418 located between the stop block 4261 and the adjusting bracket 416. After braking, the first return spring 418 resets the adjusting bracket 416 using its own elastic potential energy, thus satisfying the multiple and continuous braking requirements.

[0057] Please see Figure 12 and Figure 13In this embodiment, the second brake component 42 further includes a mounting sleeve 421, a brake handle 422, a brake switch 424, and a signal line 425. The mounting sleeve 421 is fixed to the push rod 12 using a clamp structure. That is, the mounting sleeve 421 has an opening, and ear plates 4211 are integrally formed on both sides of the opening. The two ear plates 4211 are fixedly connected by bolts, so that the mounting sleeve 421 is tightly clamped to the push rod 12. A rotating shaft 427 is vertically inserted through the mounting sleeve 421. The brake handle 422 is rotatably connected to the mounting sleeve 421 through the rotating shaft 427. A second return spring 428 is sleeved at the connection between the brake handle 422 and the rotating shaft 427. After the user releases the brake handle 422, the second return spring 428 returns the brake handle 422 to its original position through the elastic potential energy generated by its own compression, which facilitates the next braking operation.

[0058] Please see Figure 12 and Figure 13 The brake handle 422 has two snap-fit ​​grooves 4221, which are located at the end of the brake handle 422 near the mounting sleeve 421 and on both sides of the brake handle 4221. Each of the two snap-fit ​​grooves 4221 corresponds to one of the two cables 423. A snap-fit ​​block 4231 is formed at the end of the cable 423 that connects to the brake handle 422. The snap-fit ​​block 4231 and the snap-fit ​​groove 4221 engage with each other to achieve the snap-fit ​​connection between the cable 423 and the brake handle 422. The mounting sleeve 421... Each part of the brake handle 422 has a slot 4212 that communicates with the snap-fit ​​groove 4221. The slot 4212 corresponds to the two snap-fit ​​grooves 4221. The cable 423 and the conduit 426 are placed in the slot 4212. The slot 4212 on the mounting sleeve 421 snaps one end of the conduit 426 into the slot 4212. The two ends of the conduit 426 can be fixed by the slot 4212 and the stop block 4261.

[0059] Please see Figures 12 to 14 The brake switch 424 is fixed on the mounting sleeve 421, and the contacts of the brake switch 424 are connected to the brake handle 422 in a transmission manner, and are electrically connected to the control device 5 through the signal line 425; wherein, a pressure plate 4222 is vertically fixed on the brake handle 422, and the contacts of the brake switch 424 correspond to the pressure plate 4222. Figure 11The diagram shows the circuit diagram between the control device 5, the brake switch 424, the hub motor 31, and the power supply device 6. When the user moves the brake lever 422, the contact plate 4222 separates from the contact of the brake switch 424, and the brake switch 424 is in the open state. This allows the control device 5 to receive the braking status information of the handcart through the signal line 425 and disconnect the control connection between the control device 5 and the hub motor 31. At this time, the hub motor 31 stops running, avoiding the situation where the brake assembly 4 and the hub motor 31 run simultaneously, thereby improving the braking performance and braking safety of the brake assembly 4. When the brake assembly 4 does not need to brake, the contact plate 4222 on the brake lever 422 abuts against the contact of the brake switch 424, and the brake switch 424 is in the closed state, so that the circuit connection in the handcart can work normally and restore the control connection between the control device 5 and the hub motor 31.

[0060] Please see Figure 1 and Figure 11 The control device 5 is mounted on the push rod 12 and is positioned facing the user. The control device 5 is electrically connected to the power supply device 6 and the brake switch 424 via the signal line 425. The control device 5 is equipped with multiple levers (not shown in the figure), control knobs (not shown in the figure), and switches (not shown in the figure) to control the hub motor 31, control the start and stop of the hub motor 31, and adjust the operating power of the hub motor 31 to adjust the speed of the handcart. This improves the integration of electrical and electronic control in the handcart and makes it easier for the user to operate.

[0061] Please see Figure 2 In this embodiment, the power supply device 6 includes a battery box 61, a battery pack cavity 62, a battery pack 63, and a power cord (not shown in the figure). The battery box 61 is fixedly connected to the vehicle body support 13, and the battery pack cavity 62 is formed inside the battery box 61. It should be noted that there are two battery pack cavities 62 inside the battery box 61. The battery pack 63 is detachably installed inside the battery pack cavity 62, and the battery box 61 is electrically connected to the hub motor 31 through the power cord, thereby supplying power to the hub motor 31 and the control device 5. In addition, the battery box 61 is located at the rear of the cart bed 11 and below the push rod 12. By adopting a structure in which the weight of the vehicle body is set to 50% at the front and 50% at the rear, the center of gravity of the handcart is located at the bottom center of the whole. Therefore, when the handcart is pushed or lifted, the center of gravity of the vehicle body is stable and it is not easy to tip over, making it safe to use and easy to operate.

[0062] When the handcart needs to be braked, the user moves the brake handle 422, the brake switch 424 is disconnected, the power supply device 6 stops supplying power to the hub motor 31, and the hub motor 31 stops running; at the same time, the brake handle 422 pulls the cable 423, causing the adjusting bracket 416 to rotate along the axis of the adjusting rod 415, thereby causing the adjusting rod 415 to rotate. The end of the adjusting rod 415 that is clamped between the two brake shoes 413 spreads the two brake shoes 413 apart, so that the brake pads 414 fixed on the brake shoes 413 abut against the inner wall of the brake drum 411. Since the position of the brake pads 413 relative to the handcart remains basically unchanged, and the brake drum 411 is in a rotating state, the friction generated between the brake pads 413 and the brake drum 411 can reduce the speed of the drive wheel 21, thereby achieving braking of the handcart. After the handcart brakes, the user releases the brake handle 422, the brake switch 424 closes again, restoring the electrical connection between the control device 5, the power supply device 6, and the hub motor 31. The first return spring 418 and the second return spring 428 respectively return the brake handle 422 and the adjusting bracket 416 to their original positions, thereby separating the brake pads 414 inside the brake drum 411 from the inner wall of the brake drum 411, thus allowing the drive wheel 21 to operate normally.

[0063] In summary, this invention effectively improves the braking performance and safety of the brake assembly 4 by electrically connecting the second brake component 42 to the control device 5 via a signal line 425, thereby disconnecting the control connection between the control device 5 and the hub motor 31 when the brake assembly 4 is in braking mode. Furthermore, the second brake component 42 controls the first brake components 41 on both drive wheels 21, enabling simultaneous braking of both drive wheels 21, thus improving braking timeliness and safety, enhancing the integration of the brake assembly 4, reducing the number of parts, and lowering production costs. By installing hub motors 31 on both drive wheels 21 and simultaneously controlling them via the control device 5, simultaneous operation of both drive wheels 21 is achieved, improving the power performance of the drive wheels 21 and the stability of the vehicle during operation. The simultaneous braking of both drive wheels 21 by installing the first brake component 41 allows for rapid stopping without skidding, making the handcart safer to operate. Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial applicability.

[0064] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A handcart, characterized in that, include: Vehicle body assembly; The drive wheel is connected to the vehicle body assembly via an axle, and the drive wheel is capable of rotating around the axle. The powertrain is fixed inside the hub of the drive wheel and drives the drive wheel to rotate; The brake assembly is partially mounted on the drive wheel to brake the drive wheel; The control device is fixed to the vehicle body assembly and is electrically connected to the powertrain and the brake assembly. The power supply unit is fixed on the vehicle body assembly and is electrically connected to the powertrain and the control device. The brake assembly includes: The first braking component is fixed at the drive wheel to brake the drive wheel; The second brake component is fixed on the push rod of the vehicle body assembly and connected to the first brake component via a cable. The second brake component is electrically connected to the control device via a signal line. When the brake assembly is in a braking state, the control connection between the control device and the powertrain is disconnected; The powertrain includes: A hub motor is installed in a cavity on the drive wheel; The two ends of the motor shaft in the hub motor pass through the waist-shaped groove of the vehicle body bracket and are fixedly connected to the vehicle body bracket, which includes a support plate. A positioning component is installed at the connection between the motor shaft of the hub motor and the vehicle body bracket; The positioning component includes: A positioning washer is coaxially inserted through both ends of the motor shaft of the hub motor, and a boss is formed on the positioning washer. The boss is embedded in the waist-shaped groove of the support plate and clamps both ends of the motor shaft in the waist-shaped groove.

2. The handcart according to claim 1, characterized in that: The first braking component includes: The brake drum is coaxially fixed to the hub of the drive wheel and forms a receiving cavity; Brake cover, fixedly connected to the vehicle body assembly, and closes the opening of the receiving cavity; At least two brake pads are detachably and fixedly connected to the brake cover, and an elastic element is provided between the two brake pads and they are elastically connected through the elastic element. At least two brake pads are attached to the surface of the brake shoe and correspond to the inner wall of the receiving cavity; An adjusting rod, one end of which is clamped between the two brake shoes, and the other end passes through the brake cover and is rotatably connected to the brake cover; The adjustment bracket has one end fixedly connected to the adjustment rod, and the other end is connected to the second brake component via a cable.

3. The handcart according to claim 2, characterized in that: The elastic element includes: A tension spring, the two ends of which are respectively connected to the connecting holes at the same end of the two brake shoes.

4. The handcart according to claim 2, characterized in that: A cable connected to the adjustment bracket is fitted with a tube, and a stop block is fixed at one end of the tube near the adjustment bracket. The stop block is fixed to the vehicle body bracket in the vehicle body assembly.

5. The handcart according to claim 4, characterized in that: A first reset spring is fitted onto the cable connected to the adjusting bracket and is located between the stop block and the adjusting bracket.

6. The handcart according to claim 2, characterized in that: The second braking component includes: The mounting sleeve is fitted onto the push rod in the vehicle body assembly; The brake handle is rotatably connected to the mounting sleeve via a rotating shaft; One end of the cable is fixedly connected to the brake handle, and the other end is fixedly connected to the adjustment bracket; A brake switch is fixed on the mounting sleeve and is linked with the brake handle to close or open the brake switch. The signal line electrically connects the brake switch and the control device.

7. The handcart according to claim 6, characterized in that: A second return spring is fitted on the shaft connecting the brake handle and the mounting sleeve.

8. The handcart according to claim 6, characterized in that: Two cables are provided on the brake handle, and each cable corresponds to the first brake component and the second brake component.

9. The handcart according to claim 1, characterized in that: The vehicle body assembly includes: Cart bed; A push rod is fixed to one side of the truck bed and is used to mount the control device and the second brake component; A vehicle frame is installed at the bottom of the truck bed and is used to mount the drive wheels.

10. The handcart according to claim 9, characterized in that: The bottom of the vehicle body support is also fixed with casters.

11. The handcart according to claim 1, characterized in that: A cavity is formed inside the hub of the drive wheel for mounting the powertrain and the first brake component.

12. The handcart according to claim 11, characterized in that: The rotor core of the hub motor is fixedly connected to the side wall of the cavity.

13. The handcart according to claim 12, characterized in that: The positioning component includes: A fixing nut is threaded to both ends of the motor shaft of the hub motor.

14. The handcart according to claim 1, characterized in that: The power supply device includes: The battery box is fixed to the vehicle body bracket of the vehicle body assembly; The battery pack cavity is formed inside the battery box; The battery pack is detachably fixed inside the battery pack cavity; The power cord electrically connects the battery pack and the hub motor in the powertrain.

15. The handcart according to claim 14, characterized in that: The battery pack cavity is provided in two places on the battery box.

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